Full wave ground plane antenna calculator. Angle of radiation is 27 degrees.

Full wave ground plane antenna calculator. This article incorporates Full/Half-Sloper Antenna Calculator The Colossal 10K 5/8th wave ground plane was designed for high power operators who want maximum performance from their station. Tuning can be done by adjusting the 1/4 wave stub length and the feedpoint position. Although a little engineering work is required, it is well within the abilities of the home workshop and all you newly licensed amateurs or 6 Meter buffs! Jan 31, 2017 · As you can guess, the 5/8 wave antenna is a bit more complex to build than the simple ground plane antenna using a 1/4 wavelength vertical element. It's Dipole, Inverted V and Ground Plane Antenna Calculators Online and downloadable Dipole, Inverted V and Ground Plane Calculators. 70cm yagi antennas Pictures and plans to build 70 cm yagi Building and experimenting with antennas can be an interesting part of the radio hobby. Particularly, the monopole antenna is described in relation to a conducting ground plane and analyzed with image theory as a regular dipole antenna. This antenna has no gain and requires a ground plane (reflection) to operate. The vertical length height of a quarter wave ground plane antenna, and the length of each of the four radials Antenna designers are always looking for creative ways to improve performance. They are easy to build, often using a chassis-mount coax connector. Here we have collected some links to building instructions for 11m antennas on the Internet. Jan 13, 2024 · The Ground Plane Antenna Calculator is a valuable tool designed to assist users in determining the length of the vertical radiator for a ground plane antenna. So why not just keep extending the antenna out to one full wave? The feedpoint impedance of a full-wave loop in free space is aproximately 100-120 Ω with a gain over a dipole of 1. 3. Invented by the Germans for use on their zeppelins, this antenna is also referred to as a Zepp antenna. The 3/4 wave plot shows the development of high angle lobes and lower gain at the horizon when the antenna is too This calculator gives the lengths of the radiating element of a quarter wave (λ/4) ground plane monopole and the radials. MHZ The vertical length is feet. 2:1 going to 1:1 at about 69MHz, so about 0. . Sep 10, 2025 · Enter the frequency into the calculator to determine the length of an End-Fed Half-Wave antenna. e. The J-pole antenna is somewhat sensitive to surrounding metal objects, and should have at least a quarter wavelength of free space around it. A quarter wave ground plane antenna has a radiation pattern that produces maximum gain at about 25 degrees and a half wave antenna drops that angle to 20 degrees, and the 5/8 wave antenna further drops that angle to 16 degrees. The Marconi antenna is usually defined as a vertical wire with a length of 1/4 of the working wavelength, fed through its lower end. One method used in patch antenna design is to introduce shorting pins (from the patch to the ground plane) at various locations. version 6. The element are brass welding rod from Harbor Freight Tools. All the elements of this antenna are the same length as stated, "1/4 wavelength". Key parameters such as element dimensions, spacing, stub length, and antenna height above ground are explicitly indicated. Today we’re going to build a simple ground plane for the VHF 2 meter band. In this case the corners of the aluminum plate are bent down at a 45 angle with respect to the re-mainder of the plate. Author use 1/2 inch copper pipe, and the associated fittings necessary. And here for relative impedance as the wavelength fraction elevation of the feedpoint above ground. August 11, 1992. Requiring a replacement antenna for my aging 2mtr band 5λ/8 wave ground plane that is primarily used for local FM simplex and repeater communication, I settled on the simpler 1λ/4 wave ground plane antenna designed for approximately 146. The wavelength is the distance between two consecutive points of the wave, such as two peaks or troughs. The standard ground plane antenna consists of a vertical radiator which is insulated and centered between 4 horizontal surrounding radials which extend out from the base of the antenna. And here for impedance of a vertical dipole relative to angle on bend of the lower half. Ahh, the good old quarter wave ground plane! This calculator can be used to design a Quarter Wave Ground Plane antenna, with radials. The Balun matches the Balanced Antenna into the Unbalanced Although it is actually a quarter wave antenna, its radiation pattern and characteristics are very similar to those of a halfwave vertical antenna. The traditional formula for the length of a full wave loop antenna (in feet) is 1005 / MHz. An elevated vertical antenna with two or more resonant radial wires spaced at 180 degrees also creates a low angle radiation pattern with Testing Temporarily assemble the radiator/ in- sulator assembly to the plug/ wire portion, attach a ground plane and check the VSWR at two well-separated frequencies. See full list on 66pacific. 26 m tarvitaan siis 2 kpl 19. The Quarter Wave Ground Plane is a very common, simple, and effective antenna. ) If you would rather calculate the length of a full-size vertical antenna, see The Quarter-Wave Vertical Antenna Calculator. If Enter the frequency into the calculator to determine the length of a 5/8 wave antenna. This antenna wavelength calculator can be used to determine the physical length of an antenna’s electromagnetic wave in free space. Q3: Should I adjust for antenna material? SWR was good straight from the calculator, about 1. 26 m samanpituisia lankoja (1/4 aaltoa) The simple calculator below uses the well-known standard formula for determining the total wire length in feet for a single element (single turn), full wave loop antenna, (length = 1005/MHz). With this insight into the fundamental behavior of RF on wire you will better understand what is Coax Loss Calculator (based on type, length, and frequency) Impedance Matching Network Calculator (L-Network) Pi-Network Impedance Matching Calculator T-Network Impedance Matching Calculator Smith Chart Plotter Tool (coming soon) Balun / Unun Impedance Ratio Calculator Quarter-Wave Transformer Calculator Complex Impedance Calculator (R + jX) Specifications for Maco Antennas - dB gain, power multiplication, boom length, weight, and more. Note: This calculator assumes a vertical antenna with a ground plane. says in his article, if you can buy a better antenna, by all means do so, but if you need an inexpensive, unobtrusive vertical, this one will do fine. 5: I across the repeater portion at the upper end of the 2-meter band. Use our simple calculator to determine approximate dimensions of materials needed to build a vertical antenna. Amateur Quarter Wave Ground Plane Antenna Calculator. Oct 15, 2020 · Katso Radioaallon eteneminen PowerPoint esitys 1/4 Wave Ground Plane Antenna Calculator ja LOOPin mitoitus Laskin ja 71,25 / Mhz = puoliaalto dipolin viiksen pituus metriä 71,25 / viiksi = taajuus Mhz Kaavassa jo lyhennyskerroin esim: 71,25 / 3. The first online Dipole and Inverted V calculator on the page below has been around for many years and is designed as a simple "shortcut" so you will not have to do the math using the standard formulas for designing a horizontal dipole or inverted V dipole. This resulted in perfect resonance at 70. The antenna diameter hardly has any importance, as long as the antenna stays in the spline form. The calculator takes into account the wire diameter of the monopole and radials. If needed, it can be disassembled into a very small bundle no longer than the longest element. Aug 21, 2018 · That’s the the 1/4 wave ground plane antenna. Apr 3, 2020 · Was looking over different sites on how to build spiders and came across: m0ukd. Of all simple vertical antennas over ground, the 5/8 wave radiator has the lowest angle of radiation, however the base of the 5/8 antenna presents a relatively low impedance, not the high impedance offered by the 1⁄4 wave stub. The calculated dimensions are for a quarter-wave vertical element. The electric field (E, green arrows) of the incoming wave pushes the electrons in the rods back and forth, charging the ends alternately positive (+) and negative (−). 29 dB less than dipole. Many verticals are a 5/8 wave element, which has higher gain, lower radiation angle. Just enter your frequency of interest in the space provided. The Marconi radiator is resonant to any odd multiple of a quarter-wave length. Use our simple calculator to determine approximate dimensions of materials needed to build a full-wave wire loop antenna, and then shop for your needs on our other pages and select from our inventory of wire, coax, connectors, baluns, and other parts and accessories for amateur radio and other radio applications. Dec 13, 2008 · The following doesn't always get brought up in discussions of the venerable 102" stainless steel whip for use as a high reliability, broad-banded, good working antenna for 10-11-12 meters. Ground-plane Antennas for 144, 222 and 440 MHz VHF and UHF Antenna Systems 18-21 The 222-MHz version, Fig 24, uses a slightly different technique for mounting and sloping the radials. The wire diameter affects the shortening factor of both the quarter-wave vertical monopole and the counterpoises in the same way as in the case of a half-wave dipole. 7. The radiating element is a quarter wave (λ/4) and the radials are 12% longer. this calculator is designed to give the vertical length of a quarter wave ground plane antenna and the length of each of the four radials for the selected frequency you have entered. PS Apr 7, 2025 · This page allows you to calculate the length for a quarter wave ground plane antenna. When we looked at the , we saw how the shape could be changed to give different impedances, and that different shapes (and wire sizes) might require different wire lengths for the same resonant frequency. The MKII version of the ground plane was not published when I put this together but I think I would not have needed the base cap. UHF half-wave dipole Dipole antenna used by the radar altimeter in an airplane Animated diagram of a half-wave dipole antenna receiving a radio wave. Many hams use a SO- 239 chass… Aug 12, 2024 · Figure 2 presents the Lazy-H antenna model within the AN-SOF workspace. The most effective antenna has the same length as the length of the wave it is used for. These are electrically different. (That The bottom is a mount for a 3/4′ PVC pipe and the top pieces (4) are used to steady the radiator and support the ground elements. Angle of radiation is 27 degrees. This is a true unbalanced antenna, with a feed impedance of around 50Ω and therefore a great This calculator is designed to give the vertical length (height) of a quarter wave ground plane antenna, and the length of each of the four radials Provided for your use by CSGNetwork. These antennas will use three or more radials to create a virtual ground plane. Ω Ohm’s Law Calculator Ω – Enter 2 values from Voltage, Current, Power or Resistance, to find the remaining two. 1⁄4 λ vertical Ө The correct spacing of antennas in a multi-antenna deployment is a subject that is frequently brought up by Southwest Antennas’ customers. The antenna consists of two metal rods connected to a receiver R. 35 dB. The dimensions aren't typical however, this is what it took to get its SWR low. This calculator can also evaluate the frequency, given the length of the antenna is known. The 1λ/4 wave ground plane antenna has the advantage of being a simple antenna with predictable performance. 3232 / f MHz to calculate the element lengths. The Ground Plane Antenna Calculator is a specialized tool designed to assist radio enthusiasts, engineers, and hobbyists in determining the optimal dimensions for constructing a ground plane antenna. Feb 6, 2017 · Over the southern hemiphere summer of 2016/2017 I made a flurry of antennas tuned to 1090MHz to capture position information from aircraft ADS-B broadcasts. This page allows you to calculate the length for a quarter wave ground plane antenna. The results will show whether the stub is too long or too short. This antenna will be a full 1/4 wave ground plane. It uses the standard formula, 71. Since the length of the The G3JVL 6 Meter ground plane vertical is a compact antenna that is ideal for portable operations. 3% (0. This type of antenna is commonly used in amateur radio, CB radio, and other communication applications due to its simplicity and effectiveness. It is relatively simple in design and consists of a vertical conductor, typically a metal rod or wire, mounted above a conducting surface known as the ground-plane. More energy will be transmitted horizontally in 1/2 wave antenna compared to 1/4 wave antenna. This is a true unbalanced antenna, with a feed impedance of around 50Ω and therefore a great Oct 8, 2024 · Background What Is a 5/8 Wave Antenna? A 5/8 wave antenna is an antenna whose physical length is 5/8 of the wavelength of the frequency it is designed to operate at. In 1936 this design was modified into the current configuration used today and became popular with amateur radio operators by 1943. Ensure that the radials are approximately the same length as the vertical element and are evenly spaced around the base of the antenna. Full wave, closed loop antennas are broadband, low Q devices and exhibit a theoretical gain of approximately 2 dB over a half wave dipole. Specifically, the 1/4 wave ground plane like the Starduster and Merlin as well as comparison to other verticals like the 5/8 wave Imax. 1/4 Wave Ground Plane antenna calculator – Build a simple quarter wave with radials. The overall design is simple, with a vertical element surrounded by a ground plane consisting of two or four wires bent down. J-Pole Antenna Calculator An omni-directional end-fed half-wave antenna with a quarter-wave transmission line matching stub. This can be useful for determining antenna ground plane requirements, antenna spacing requirements to prevent coupling in for multi-antenna systems, or other situations where the antenna’s wavelength is needed. In the real world, installed at practical amateur heights (physically close to ground), the range of feedpoint impedance can be from 50-240 Ω depending on configuration, orientation, and choice of feedpoint. The quarter wave antenna is what I use as standard measurement to compare results for reception and transmission properties of other antenna designs. •K7MEM- Inverted-V Antenna Calculator •COMMERCIAL- Alpha Delta- Models DX-A Twin Sloper (160, 80 and 40 meters) and DX-B Single Wire (160, 80, 40, 30 meters) sloper antennas. Aug 27, 2024 · Antenna Length Calculator Frequency (MHz): Calculate Here's a table summarizing the recommended antenna lengths for various types and frequency ranges: The length of an antenna is key to getting a strong signal from devices like TVs, radios, and wireless gadgets. We have also looked at . Very common for CB. You can use an antenna analyser to easily find if you are too long or short. It also exhibits a slight gain compared to a quarterwave groundplane antenna. com Coil calculator On-line single-layer coil designer Quarter Wave GP Antenna Calculator Amateur quarter wave ground plane antenna calculator, calculate vertical and radial length Dipole, Inverted V and Ground Plane Antenna Calculators Online and downloadable Dipole, Inverted V and Ground Plane Calculators. Your source for 6m antennas and related accessories including 6m quarter-wave and half-wave vertical antennas, repeater antennas, and high performance and heavy-duty yagis, from our inventory of antennas, antenna parts, and antenna accessories for amateur radio and other radio applications. The Wire Size can range from 16 AWG to 12 AWG. There are usually four radials, three being a minimum, but you could use up to six. Jun 24, 2020 · The antenna arrived at is shown below, and looks very similar to a standard 2m quarter wave ground plane except radial and radiator lengths and radial angle. It greatly affects how well these devices work. The Ground Plane vertical omni directional antenna is very easy to build with just some #12 solid copper electrical wire and a UG58 type N chassis jack. To illustrate how this may help, two instances will be illustrated, the quarter-wavelength Patch Antenna, which leads into the Planar Inverted-F Antenna (PIFA). Computer Support Group, Inc. The term “5/8 wave” refers to the fact that the antenna is slightly longer than a half-wave antenna, and it is specifically tuned to optimize performance for certain applications. The 4 Jan 14, 2007 · A 1/2 wave dipole is slightly better than a 1/4 wave ground plane and 5/8 or . A full wavelength vertical antenna will have a big null at the horizon with lobes pointing up and down and a wet noodle will probably work better unless your Slim Jim and J-Pole antenna calculator – Build a cactus for any frequency. Sep 9, 2025 · A free online calculator for making all of the calculations required to design and build small transmitting loop antennas, also known as magnetic loops by 66pacific. What is commonly found on many Groundplane antenna model FA-2 from the book PRACTICAL ANTENNA DESIGN second edition, Philippine copyright, 1990, 1994 by Elpidio C. Oct 8, 2020 · Does anyone know the proper formula for the length of the ground plane radials for a 5/8 wave 450-470 mobile antenna. , in the half-space above the ground plane) as the dipole in free space. One of the most useful antennas in the repertoire is the Marconi or quarter wave grounded vertical antenna. Happy broadcasting. Since the A: A quarter-wave antenna uses ground plane reflection to create an electrical half-wave dipole, making it efficient while being compact. Enter the formula for the antenna calculation You may have noticed a pattern developing here. But this is problematic in that, the 1. In practice, a ground plane cannot be infinite, but a ground plane with a radius approximately the same as the length of the active element, is an effective, practical solution. Aug 3, 2022 · The GP is the omnidirectional antenna. First off you’ll notice the radiating element. The 5/8 wave antenna is a non-resonant antenna. Dec 22, 2024 · A quarter-wave antenna, often used as a monopole antenna is mounted vertically and operates effectively over a ground plane. 5cm was cut from the driven element and 1cm from all radials. This calculator is made for Javascript enabled and capable browsers. This calculation is crucial for achieving optimal performance in radio frequency applications. Sep 3, 2025 · Build A 9dB, 70cm Collinear Antenna 70cm, Collinear Antenna From Coax 440 Mhz J-Pole Antenna plans Here is a 70cm (440 Mhz) J-Pole antenna that is inexpensive, and easy to build. Jun 22, 2019 · For this weeks project, we will be building a 1/4 wave ground plane antenna. electronics > What is a PCB with a Ground plane?. 45MHz and a perfect match to 50Ω coaxial cable. This calculator is designed to help you create a quarter wave ground plane antenna with radials. DX GROUND PLANE ANTENNA A 5 Band 20 - 10 Meter Multiband HF Ground Plane Antenna Project By Don HC4/W4BWS Get on the air on 20, 17, 15, 12 and 10 meters with one vertical ground plane antenna! Editor note: Due to the complexity of the original article submitted to us and the task of getting all of the details on the web, the complete article is available for download here in its entirety! This Predict the received signal strength Amateur Radio Toolkit Android app with lots of antenna information Antenna designs 1/4 Wave Ground Plane Antenna Calculator Quadrifilar helicoidal antenna calculator Building an 868/915 MHz co-linear antenna tutorial 868 MHz antenna schematic PDF 915 MHz antenna schematic PDF NEC based antenna modeler and This calculator is designed to give the vertical length (height) of a quarter wave ground plane antenna, and the length of each of the four radials Dipole Antenna Calculator The measurements below are for building a simple Dipole Antenna. 5MHz. Our dipole calculator is a simple tool that allows you to compute the length of simple antennas, particularly the very efficient half-wave dipole antennas. Oct 16, 2024 · Background A quarter-wave antenna, often used as a monopole antenna is mounted vertically and operates effectively over a ground plane. Jun 8, 2023 · A ground-plane antenna, also called a quarter-wave or a monopole antenna, is widely used in radio communication systems. However, the dimensions are sub optimal for min SWR for 145MHz but enable a 3/2 wavelength antenna on 70cm as we will see. COPLANAR WAVEGUIDE WITH GND IMPEDANCE CALCULATOR - Create the ideal trace for your antenna The characteristic impedance (Zo) of coplanar waveguide with ground with signal side ground plane can be calculated using the active calculator below. To produce low angle radiation, a ground plane of radial wires is used to simulate a ground. Jun 11, 2017 · I have been making a few 1/4 wave antennas lately, mainly for UHF and the GHz bands with good success, so I decided to create a calculator to simplify the process and maybe get some people who have not tried one before to give it a go. Com and Computer Support Group fun project to build and learn how to tune antennas is a 1⁄4 wave ground plane antenna using an SO239 connector; 12 gage solid copper wire or 36“ brass or aluminum brazing rods ,4 each 10-12 gage automotive buss eyelet connectors. The main radiating element is a quarter wavelength (λ/4), while the radials are 12% longer. What is Wavelength Calculator A Wavelength Calculator is a tool used to determine the wavelength (\ ( \lambda \)) of a wave based on inputs such as the wave's frequency (\ ( f \)) and the speed of the wave (\ ( v \)). The 5/8 wave antenna has about 3 dB gain over a quarter wave vertical. Common types of monopole antenna are the whip, rubber ducky, umbrella, inverted-L and T-antenna, inverted-F, folded unipole antenna, mast radiator, and ground plane antennas. The nice thing about making antennas for Gigahertz frequencies is that they tend to be rather compact. This page can be used to calculate the element and radial lengths for a 1/4 wave ground plane antenna. The ½-wave vertical dipole brings in a great many signals that cannot be heard on the big horizontal dipole, and is considered a complete success. I purchased the kit and only have the formula for a 1/4 wave antenna. Construction details / methods vary - electrically you are still having an antenna with 1/4 wave vertical active radiator and with one or more 1/4 wave long , active "horizontally sloped , above ground radial (s) ". This calculator can evaluate either variable given the other… Dec 5, 2024 · Calculator Ground Plane The standard ground plane antenna consists of a vertical radiator which is insulated and centered between 4 horizontal surrounding radials which extend out from the base of the antenna A 1/2-wave antenna does not require a ground plane, making it suitable for remote mounting in any location. 64 wavelength vertical over a ground plane is slightly better still because they compress more signal at the horizon instead of wasting it up in the air. 11 Source Jun 4, 2022 · Make sure you are discussing / talking about "ground plane antenna" - most people will assume "vertical with ground MOUNTED radials". One of the realities that comes with choosing a full-wave loop Sep 12, 2025 · The Antenna Calculator aims at delivering a comprehensive and practical tool to Antenna Engineering students and practitioners. We'll look into why antenna length matters and how A monopole over an infinite ground plane is theoretically the same (identical gain, pattern, etc. What is a Ground Plane? Criterion Cellular, 2006. It'll also provide you with your antenna's corresponding wavelength value and the option to use an adjustment factor [k] calculated using your dipole conductor's diameter. This calculator is designed to give the vertical length (height) of a particular antenna, for the frequency and wavelength chosen. Building and experimenting with antennas can be an interesting part of the radio hobby. Quarter-Wavelength Patch A Quarter Wave Ground Plane Antenna Calculator Ahh, the good old quarter wave ground plane! This calculator can be used to design a Quarter Wave Ground Plane antenna, with radials. Antenna CalculatorHF Antenna Calculator Moved PermanentlyThe document has moved here. Dec 5, 2024 · The vertical length height of a quarter wave ground plane antenna, and the length of each of the four radials amateur quarter wave ground plane antenna calculator calculate vertical and radial length . Before we start, be prepared to experiment! The calculator will get you close (or spot on if you're lucky), but there are so many variables. Nov 28, 2023 · Vertical radiation plots of 1/4 wave vertical (green), 1/2 wave vertical (fuchsia), 5/8 wave vertical (blue), and 3/4 wave vertical (brown) over perfect ground. Listed under the Antennas/Antenna Calculators category that is about Calculate and Design Antennas . This suggestion is a flop. Like L. Jan 25, 2018 · Paying attention to the effect of the ground plane, using the right materials and matching the impedance of the antenna to the impedance of the coax and the coax impedance to the receiver impedance can all play a role in wringing out the last drop of gain from the antenna. Oct 8, 2023 · He proved that for such an antenna placed over an ideal ground with the feed point at ground level and assuming a sinusoidal current distribution, the ground wave radiation would be maximum at an electrical length of the antenna of about 225°, or 5/8 of the wavelength. To fully understand the results obtained by this calculator, please take a few minutes to read the explanation below it. The simulated ground plane represents average conditions, characterized by a Apr 14, 2002 · Now that I have the disclaimers out of the way, I wanted to start a thread to discuss some of what is actually going on with some of the antennas that have seen interest in this forum and others. While there is a theoretical gain of about 3 dB over a 1/4-wave antenna, in practice, this benefit is seldom realized. To bring the resonant A vertical antenna mounted close to the ground produces high angle radiation that is undesirable at VHF and UHF frequencies. The larger the wire, the wider the bandwidth. Each radial is evenly spaced 90 degrees or so from each other around the vertical element. Sep 9, 2025 · Homebrew a 5 8 wave ground plane antenna for 10 meter band Interesting article with Other 0 dB/D gain systems are 1/2-wave antennas such as the Zepp-Windom-Fuchs and vertical radiators such as Ground Plane-Discone (all in space). 55). 02. Its invention made it possible to halve the length of antennas, simplifying communications, especially at HF and below. Eventually at an angle of 90° the radials will combine and the ground plane antenna becomes an vertical dipole and e It can be seen from the graph that by dropping the radials at about 45° that the antennas impedance is close to 50Ω. Feb 26, 2022 · Building a 1/4 wave ground plane antenna is very easy to do. 0 MHz range as SWR 1:1 Standard form with more radials DROOP ANGLE n increasing angle of droop. So, why go to all the trouble of building the 5/8 wavelength vertical antenna? W4SAT gives us several reasons to build this larger vertical antenna: What is Wavelength Calculator A Wavelength Calculator is a tool used to determine the wavelength (\ ( \lambda \)) of a wave based on inputs such as the wave's frequency (\ ( f \)) and the speed of the wave (\ ( v \)). 8 to 2. Each radial is evenly spaced (90 degrees from each other) around the vertical element. Reverse engineering showed it to have a velocity factor of 94. To bring the resonant frequency up, shortern the 1/4 wave stub. Both metric and English units of measurement are supported. Calculator Enter Frequency or wavelength of operation, Velocity factor % use this online calculator to determine the length of a full wave loop antenna from the frequency both metric and english units of measurement are supported quarter wave matching section lengths are also calculated . , 2006. Place a 1:1 Balun on the Antenna end of the Feedline. The vertical monopole is an omnidirectional antenna with a low gain of 2 - 5 dBi, and radiates most of its power in horizontal directions or low elevation angles. Monopole antennas are presented. 1⁄4 wave Vertical monopole, which requires a ground plane (elevated) or a system of ground radials (ground-mounted). This element is 1/4 wavelength long, or about 19 inches for the 2 meter band. This calculator was adapted from the Coil-Shortened Dipole Antenna Calculator. Enter the formula for the antenna calculation (normally 234/f): divided by Freq. Latorilla John Whitmore, sci. Gain is about 2 dBd 15 degrees above the horizon. It needs a ground plane with very good conductivity. Mar 11, 2018 · Here is the antenna modeling information for 1,2,4,6 and 8 ground plane radials at various angles of slope. Collection of online calculators for calculating homemade antennas for modern types of radio communications Antenna Calculator for a Dual Bi-quad Antenna A 160 degree (+/-) directional antenna with gain. 699 Mhz = 19. The Colossal has exceptionally quiet receive with superior transmit power over other designs, hi Q parallel tuned matching network assures maximum power transfer without feedline radiation. Ground plane antennas are easy to recognize by their appearance. This type of question has become more common given that multi-antenna MIMO and MANET mesh systems are now much more prevalent in the market than they were even five years ago. Excellent for use with WiFi where you want full coverage in house, but not to the neighbors, or to beam across a long area. There are many comparative evaluations Feb 6, 2025 · For RF applications, a 1/2 wave antenna will be more suitable compared to a 1/4 wave antenna due to following reasons: No Ground plane is required for 1/2 wave antenna while its required for 1/4 wave antenna. May 5, 2019 · For this weeks project, we will be building a 1/4 wave ground plane antenna. Aug 24, 2025 · Dimensions for Vertical Full Wave Loops last updated 20 March 2025. This creates a ground-plane antenna. If you're planning on putting one of these outside, don't forget to properly waterproof and install lighting protection. Sep 27, 2015 · The standard ground plane antenna consists of a vertical radiator which is insulated and centered between 4 horizontal surrounding radials which extend out from the base of the antenna. 10 Meter Vertical Ground Plane Antenna OBJECTIVE: Construct a vertical ground plane with one vertical element, and two radial elements, from readily available parts. We present the basic theory and rigorously validated calculators to analyze and design numerous antenna types and related components. Because this is a half-wave antenna, it will exhibit gain over a quarter-wave ground-plane antenna. In the text below, we will cover the basic rules of antenna Nov 28, 2023 · Yes, it is a mouthful, but all those qualifiers help to define the antenna we are discussing here: a full wave loop in the vertical plane, fed in the middle of one side for vertical polarization, considered over ground. It should be possi- ble to get the VSWR below 1. com Morse code tutor HF Double Bazooka Calculator Groundplane Calculator Quad Antenna Calculator Yagi Antenna Calculator Make a Vertical Bazooka Coax losses Calculator and Charts This calculator can be used to design a Quarter Wave Ground Plane antenna, with radials. B. Here I document them, from newest to oldest. It's The standard ground plane antenna consists of a vertical radiator which is insulated and centered between 4 horizontal surrounding radials which extend out from the base of the antenna. Generally it consists of a quarter wave vertical radiator connected to the center of the coax feeder, and 4 radials, often sloping downwards, that are also about a quarter wave long. The radials in such an antenna system serve as the “mirror” or counterpoise to the vertical radiating element, simulating a ground plane and thus completing the antenna system. The length of the wire is calculated using the equation on the right. This type of antenna is very easy to build and I recommend all beginners to give it a try. This section contains three tables that can calculate antenna shortening factors and antenna lengths, including quarter-wave verticals over perfect ground, half-wavelength dipoles in free space, and long wire vertical and horizontal antennas. A proper ground plane, typically consisting of several radial wires, is crucial for the antenna's performance. Antennas shorter than 1/2-wavelength (tuned by a loading coil or traps) have much less gain. If you have no particular preference within a given ham radio band, then simply enter its center frequency (i. Use this online calculator to determine the length of a quarter-wave antenna from the frequency. Apr 13, 2019 · for my next antenna project I'm doing 5/8 wave ground plane , my design uses aproximatly 21 foot driven element with four 1/4 wave 102" radials set at 45° , unlike my current homebrew 1/4 wave ground plane the new one will require some kind of matching transformer, I have seen some balancers Jul 4, 2021 · Oddly enough, even the 1/4 wave antenna is in effect a 1/2 wave antenna in that the ground plane (or ground radials) effectively satisfy the function of the missing 1/4 wave portion. The simple calculator below uses the well-known standard formula for determining the total wire length in feet for a single element (single turn), full wave loop antenna, (length = 1005/MHz). 15 for the 40 meter band). Gain is -0. Jun 5, 2021 · The Antenna Calculator for Half-Wave Dipoles Enter your desired frequency (MHz) of operation (i. Simply input the required data fields to check your chosen dimensions ensure the impedance you require. The antenna is designed to be fed with 50 or 75 Ohm Coax Cable of most any length with a Balun. It's hard to believe says VE2BMC, but going from 1/4 wavelength vertical to a simple rectangular loop can lead to 3-4 "S" units improvement. Antenna Calculator for a 3 to 15 element Yagi directional antenna A very directional antenna for 3 to 15 elements. That should be an attention getter! Antenna (RF) Calculator: Radio and RF units conversion/JavaScript applications. 1/4 wave ground plane construction guide 1/4 wave ground plane calculator Use a good quality 50 ohm coax to connect your transmitter and antenna. Feb 13, 2017 · An antenna is a conductor in the form of a spline, electrically connected to the communications module through a transmission line. The upper-right portion of the figure displays the 3D radiation pattern for the 10-meter band, with gain expressed in dBi. 943 in the calculator). Q2: What's the practical application? A: Used in CB radios, WiFi routers, mobile phones, and many other RF applications where space is limited. Antenna Length Chart in Feet and Meters22-Jun-2007 09:30 AM Feb 11, 2020 · I know that an antenna that has half a wavelength does not need the ground plane (example a dipole antenna) and when using a wavelength of 1/4 it is usually necessary to have the ground plane (planar antennas [PCB]). The wavelength of a 1090MHz transmission is approximately 275mm. Our jungle antenna will use one upright as the radiator and three radials (“legs”). com 1/4 Wave Ground Plane Antenna Calculator Quarter wave antenna calculator. jdsq rnha erktzd gaqg mhoumow isr wofeq rnyvewjh xmjmkla wanytv