Antenna Calculators
Calculate and Design Antennas
Antenna calculators are essential tools for hams designing and building antennas for any band. These utilities help operators determine precise element lengths, spacing, and other critical dimensions needed for optimal performance. Whether planning a simple wire dipole or a complex multi-element array, accurate calculations ensure the antenna resonates at the desired frequency and achieves its intended radiation pattern.
Operators frequently use online calculators for popular designs like the Slim Jim, Cubical Quad, and various wire antennas. Specialized tools also assist with more advanced projects, such as magnetic loop antennas or Log-Periodic Dipole Arrays. Beyond element dimensions, some calculators, like CantennaCalc, help with unique designs, while others provide critical engineering data, such as wind loading stress on antenna masts, ensuring robust station construction.
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Design your own 5/8 wave vertical antenna. A simple jscript calculator at Antenna Elmer. -
A JavaScript to calculate the dimensions for a seven element Yagi-Uda Antenna -
G4URH calculations to design your own antennas, ground plane, half wave antennas, Quad Antennas and 5/8 verticals -
This basic calculator is designed to give the aproximate length (height) of a particular vertical antenna, for the frequency and wavelength chosen. -
Calculations for determining the wind loading stress on an antenna mast. Link to a spreadsheet for calculating the mast bending stress based on wind speed and antenna cross sectional area. -
The calculation refers to either a loaded 1/4 wave or a loaded dipole, -
Design your own antenna trap online -
This is a simple calculator for solving the antenna wire catenary between to end points given the design wind speed, mass per unit length of the wire, wire diameter and Gross Breaking Strength of the wire. -
Simple implementation of the ARRL Antenna Book design equations for the axial-mode helical antenna. -
Calculate Double bazooka for Win3/Win95 by W4BEJ -
Kioan's calculator for building a Cantenna , directional waveguide antenna for long-range Wi-Fi -
Ever need a way to estimate the amount of wire to add to or remove from a center-fed wire dipole antenna to achieve resonance at a desired frequency? This article help to determine correct wire lenght. -
On-line single-layer coil designer -
This page lets you do calculations for single layer air cored coils using the solenoid formula -
Calculate the inductance of a single-layer, air-core coil. -
Easy Quad calculator, enter center frequency to get a quad antenna size -
An online javascript calculator for cubical quad antennas, simply input the resonating frequency to calculcate up to a five element quad antenna. This quad antenna calculator let you determine the total length of each element and spacing among elements. -
Javascript for calculating the lengths of tubing to be used for the construction of a Super J-Pole in a collinear design -
Enter the resonant frequency for the dipole/vee antenna calculation -
Input the desired resonant frequency and it will calculate lenght in inches feet and meters -
Calculate eh antenna components dimension with this online form -
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 -
Calculate dimension for HB9CV directional antennas -
This is my simple implementation of the ARRL Antenna Book design equations for the axial-mode helical antenna. -
calculates the dimensions and spacings of the elements needed to build a log periodic antenna, given tao, sigma and the lower and upper cutoff frequencies. -
This LPDA calculator is based on the design procedure as described by L. B. Cebik, W4RNL (SK) in the 21st edition of The ARRL Antenna Handbook. -
Calculates resonant frequency of a loop antenna, correcting for distributed capacitance. -
KA1FSB loop calculator give you a quick overview of the feasibility of "squeezing" a loop into your available yard or apartment space. The easy calculator yields a reasonable approximation of dimensions, to within 5% over the amateur bands, using typical wire gauges ranging from 12-18 AWG. -
Free windows program to calculate magnetic loop antenna.This small loop antenna calculator allow to determine capacitance and voltage based on Loop circumference, desired resonant frequency, conductor diameter and the operating power -
Magnetic loop antenna calculator and loop antenna design program for windows let you calculate dimensions for magnetic loops antennas, in german -
A magnetic loop antenna calculator made with an excel sheet that run also with open office, let you design mag loop antenna dimensions by AA5TB -
This calculator calculates the length and width of a patch antenna based on the frequency, dielectric constant of the dielectric and the height of the thickness of the patch antenna substrate. -
Online Moxon antenna calculator. Design your moxon antenna online giving wire diameter and resonant frequency -
Java script antenna calculators for ground planes, half wave verticals, quad antenna, 5/8th wave vertical antenna, dipole and inverted vee antennas -
Online calculator and construction instructions -
Design a parallel circular wire balanced transmission line with this online calculator. This calculator is a tool for designing balanced transmission lines with a specific desired characteristic impedance Zc and made of parallel circular conductors of a given diameter d. -
Design a parallel square stock balanced transmission line with this calculator. -
Cubical Quad Antenna On-line Calculator helps on defining the size of each element and spreader. Simply give the resonating frequency and it will calculate size of each element. -
Cubical quad antenna calculator in java script let you calculate elements size and spacing in inch and meters. -
Calculate design for a quadrifilar helicoidal antenna -
Amateur quarter wave ground plane antenna calculator, calculate vertical and radial length -
This calculator computes the matched line loss for a transmission line using a model calibrated from data for the transmission line types built in to the calculator. It also gives an estimate of the mismatched loss if the mismatch is specified. -
How to make a simple but effective Slim Jim antenna. It includes a calculator to work out all the mesurements for the frequency you require. -
Easy to use online Slim Jim antenna calculator. Input your frequency to automatically calculate the lengths of the different antenna parts. -
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.com -
This calculator is designed to give the efficiency loss of a given antenna, based on the input of VSWR (voltage standing wave ratio) and other subsequent factors -
Calculate your dipole, 3 element yagi and a simple dipole -
A javascript online calculator for popular wire antennas, from the standard easy to build flat-top dipole, to the inverted V dipole, but also the Quad Loop, and the equilateral delta loop antenna -
Yagi Calculator is a free Windows program that also runs well on Linux, Ubuntu 8.10 under Wine, to produce dimensions for a DL6WU style long Yagi antenna. Long yagis are commonly used from the 144MHz amateur band to the 2.4GHz band. -
This article includes an online calculator for a 3 element Yagi Antenna. The formula and basics theory of Yagi Antenna are also explained with examples. -
This calculator is designed to give the critical information of a particular beam antenna, in this case a three element Yagi, for the frequency chosen. -
Online antenna calculator for a basic 3 elements yagi uda directional antenna. The described antenna design offers a front-to-back ratio of at least 20 dB, a gain exceeding 7.3 dBi, and a bandwidth (SWR < 2) of approximately 7% around the center frequency. It has an input impedance of 50 ohms when using a straight split dipole, which can be substituted with a folded dipole of the same length, increasing the impedance to 200 ohms. A matching balun is required for coaxial feeder connection, and the boom should be made of a dielectric material, like wood. -
A 5/8 λ antenna, often thought to be ideal for all frequencies, has unique characteristics that don't universally apply. First introduced for medium-wave radio, it works optimally at 225° antenna length over ideal ground, yielding high efficiency. However, at VHF and higher frequencies, it offers no advantage over other antennas due to real ground conditions and complex matching requirements. DIY calculators provide only rough estimates, useful as a starting point for simulations, not for precise builds. -
Online javascript antenna calculator designed to give the critical information of a particular beam antenna, in this case a seven element Yagi, for the frequency chosen. -
This calculator is designed to give the horizontal length of a particular dipole including Tees, antenna, or one side of it, for the frequency chosen. Enter the desired frequency and select the desired calculation from the drop box -
W0FMS Two-Wire Beverage (SWA) Transformer Calculator -
Online calculator for Bi-Quad antennas -
Inches and meters Javascript Wavelength Calculator allow to input a frequency in MHz and calculate wavelenght in several units considering also fractions of wavelenght and the velocity factor. Includes an usefull inch to meter converter -
ICNIRP is a calculator software that allows you to determ safety distances for many know amateur radio antennas with respect to ICNIRP limits developed by DL9KCE -
Online calculator for Cantenna special antenna for 802.11 Wi-Fi bands -
Aka Circular Waveguide Antenna. This online antenna calculator let you plan your cantenna for the desired frequency of operation, giving the Can diameter you have available. -
Calculate vertical array pahse antenna accorting to the Christman technique -
The collinear antenna, or Marconi-Franklin antenna, is an omnidirectional, high-gain antenna composed of in-phase half-wave dipoles aligned vertically. By using quarter-wave transmission line segments, it maximizes gain at a low horizon angle, outperforming a half-wave dipole. Adding segments increases gain but narrows bandwidth. A popular DIY version, the CoCo antenna, uses half-wave coaxial cable segments connected by non-radiating transmission lines. Built with stable velocity factor cables, a matching quarter-wave sleeve balun, and ferrite rings for attenuation, the antenna achieves performance comparable to commercial models. -
Author found a ratio between the lengths of the sides of the Delta Loop that give reasonably low SWR into a 50 ohm coaxial cable almost independent of the high above ground and other surroundings. This ratio also gives good results no matter orientation. Includes an online delta loop antenna calculator. -
Online antenna calculator for cubical quad antennas by EA1DDO / HK1H -
Calculate dimension for discone antennas online -
Online antenna calculator for homemade double biquad antenna for UMTS 3G 4G WiMAX WiFi frequencies. Article includes also a simple biquad antenna for 4g -
Extended Double Zepp measurements for all ham bands, and online calculator. The antenna is constructed much like an ordinary Dipole antenna but with 5/8 Wavelength Elements matched with an added Impedance Matching Section of balanced feed line -
A simple online folded dipole antenna calculator -
Online HB9CV antenna calculator, accept as input the desired resonating frequency and provides dimensions for spacing and length of each element, including boom and radiator diameter. -
Helical antennas invented by John Kraus give a circular polarized wave. They are one of the easiest to design. Find a tube with a circumference equal to one wavelength, and wrap wire in a helix spaced a quarter wavelengt -
Online helix antenna designer, calculate size of helix antennas online -
Helix antenna online calculator with match calculator -
Calculate the inductance of twin lead online -
An inverted Vee antenna calculator that consider also minimun vertical height and horizontal spread by M0UKD -
Online calculator for J-Pole antennas. The J-pole antenna consists of a short and a long vertical pole with a feed point near the bottom. The antenna looks like the letter J, hence the name J-pole antenna. -
The J-pole antenna calculator helps users design custom J-pole antennas for specific frequency bands. It provides dimensions for key antenna sections based on the chosen frequency and material’s velocity factor. The calculator also offers insights into J-pole antenna mechanics, velocity factors, and mounting tips, making it ideal for enthusiasts creating antennas for amateur or mobile radio communications. -
This page provides a detailed guide on the J-pole antenna, an end-fed half-wave antenna matched to the feedline by a quarter-wave transmission line stub. It covers the characteristics, construction materials, feeding options, and mounting considerations for optimal performance. The information is useful for hams or amateur radio operators looking to build and set up a J-pole antenna for improved transmission and reception. -
Online antenna calculator for J-Pole models. -
An online J-Pole antenna calculator that need just to input the frequency and calculates in inch size of each element -
Here is a formula and calculator for creating a loaded (shortened) quarter wave vertical or balanced dipole. The calculation refers to either a loaded 1/4 wave or a loaded dipole -
Online calculator for Logarithmic Periodic Dipole Antenna LPDA -
Description and online calculator for Log Periodic Dipole Arrays LPDA are directional antennas featuring a relatively constant characteristics across a wide frequency range. -
Excel spreadsheet that help calculating dimensions of a high efficiency magnetic loop antenna for HF bands. Giving in input the loop perimeter, loop diameter and loop conductor will calculate electric characteristics, bandwidth, and efficiency -
Microstrip Patch Antenna Calculator determines the length and width in millimeters of a rectangular patch antenna. -
Online antenna calculator for the microvert capacitive antenna -
HF Beam Calculator for Amateur Radio and CB Communications -
This online microstrip patch antenna calculator determines the length and width of a microstrip patch antenna for a given frequency -
An excel spreadsheet that in a really simple way checks how much to trim your antenna elements. Download the xls file and watch the presentation video include in this page -
This air-core solenoid style RF inductor calculator calculates the inductance, wire size, number of turns, and other parameters for an air-core solenoid inductor used in radio frequency (RF) circuits, based on user input of frequency, desired inductance value, and physical dimensions. -
This RF Toroid Calculator provides graphical calculator used to determine the inductance and other parameters of ferrite and powdered-iron toroids. It simplifies the process of selecting the appropriate toroid for use in radio frequency (RF) circuits -
An Excel sheet calculator for the T2FD wire antenna. The sheet has been proved to work either on LibreOffice and Apple Numbers. Just input the resonating frequency to get the proper size and dimensions. -
This unique online tool helps Ham Radio operators to choose the right rotator for medium and large HF antenna systems. The algorithm implemented in this calculator is the result of 40 years of experience in the HF Antenna sector. Given the Wind Speed, the total antenna square area, and the boom length, it will return the calculated torque value. -
The Magloop Antenna Calculator was developed to predict the characteritics of a small-loop (aka magloop) antenna, given physical dimensions entered via slider widgets. This magnetic loop antenna calculator works also on most mobile devices, adjusting sliders and calculating dimensions in real time. -
The Triple-M-beam calculation program is used for the calculation of Triple-M-beam antennas by DG0KW -
This page presents an online calculator tool for determining the dimensions of various HF wire antennas operating between 1.8-30 MHz. Users input their desired resonant frequency to obtain precise measurements for four popular antenna types: standard flat-top dipole, inverted Vee, quad loop, and equilateral delta loop. The calculator provides comprehensive measurements including leg lengths, minimum heights, horizontal spreads, and feedpoint distances. Accompanying the calculator are detailed technical explanations, construction notes, and installation guidelines for each antenna type, making it a practical resource for amateur radio operators building their own antennas. -
A basic YAGI UDA online antenna calculator, accept as input frequency, number of elements, diameter of parasitic element and boom diameter. This online calculator will generate a basic design data including each element length and spacing. -
Online Yagi Uda antenna calculator