Hence the addition of ground plane elements.

The antenna calculator assumes the antenna will be mounted on a mast, and not be close to actual ground. As the dipole antennas, the monopole antennas are also omni-directional, this means they transmit and receive equally well in a degree plane around their axis. It is made of a straight rod conductive material mounted perpendicular to other conductive material or surface that is referred to a the ground plane. Invented in by Guglielmo Marconi IT who discovered that if he attached the live terminal of his transmitter to a wire perpendicular to the earth and the other terminal was attached to earth, he could transmit for long distances. This is a design is called a monopole antenna. It gets its name from its Slim constructions and J I ntegrated M atching. In this design was modified into the current configuration used today and became popular with amateur radio operators by An omni-directional folded dipole with a quarter-wave j type matching stud. Invented by the Germans for use on their zeppelins, this antenna is also referred to as a Zepp antenna. Note: when using coax for antenna elements it is advised you lookup and apply the velocity factor because RF slows down in coax and this will impact the effective measurements for antenna elements.Īn omni-directional end-fed half-wave antenna with a quarter-wave transmission line matching stub. The wavelength calculators used to calculate the antenna element dimensions will therefore use the speed of light meters per second in a vacuum as constant. To optimize the antenna for a frequency RANGE, do the calculations twice, once for the low end of the range and once for the high end then average the two and plan to adjust the VSWR on both ends of the range as needed.Radio waves behave very similar to the photons in light waves. The center of each Tee should be joined to the end of each of the dipole main elements. Lengths are given in feet, inches and fractions of inches, and in meters. In the case of the Tee selection, the length given is for each of the two main elements AND each of the Tees each side of the Tee is half the length of each main side. Click on Calculate and the optimum length for that combination will be displayed in feet and inches. Enter the desired frequency and select the desired calculation from the drop box. 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. This calculator requires the use of Javascript enabled and capable browsers. Amateur Dipole Antenna Calculator Amateur Dipole Antenna Calculator

Dipole antenna calculator formula