What is the formula of antenna length?
Basic calculation is the speed of light divided by the frequency. Say of an airband antenna to receive 125 MHz then it is 300/125 = 2.4 meters full wave length. Commonly, but not exclusively, antennas are either a ½ wave dipole hence 1.2 meters or a ¼ wave monopole hence 60cm in length.
What is the antenna size and wavelength?
An antenna – usually 1/2 wavelength long – split at the exact center for connection to a feed line. Dipoles are the most common wire antenna. Length is equal to 1/2 of the wavelength for the frequency of operation. Fed by coaxial cable.
How does wavelength affect antenna size?
Each radio signal has a characteristic wavelength just as is the case for a sound wave. The higher the frequency of the signal, the shorter will be the wavelength. Antennas for low-frequency radio signals are long. Antennas for higher frequencies are shorter, to match the length of the waves they will send or receive.
What is the relation between antenna length and wavelength?
Dipoles are the most common wire antenna. Length is equal to 1/2 of the wavelength for the frequency of operation.
How to calculate the length of a 5 / 8 wave antenna?
This page allows you to calculate the length for a 5/8 wave antenna. It uses the standard formula, 585/f (178.308/f for metric) MHz to calculate the element lengths. If you’ve experimented with 5/8 wave antennas before and know of a better formula for your QTH, feel free to change the formula to suit. This formula is for a wire antenna.
What makes an antenna tuned to 5.8GHz or 5.9ghz?
But what we really need to know is the length of the exposed wire (without shielding) affects the signal frequency that it receives. If the wire was about 12.92mm then it’s tuned for 5.8Ghz, but only just a little shorter e.g. 12.70mm, and it becomes tuned to 5.9Ghz. The same theory applies to 2.4Ghz system, it’s the same such as radio receiver.
Is there a dipole antenna for a 5.8GHz transmitter?
If you open a dipole antenna that comes with every 5.8Ghz video transmitter or receiver, you will find it’s just a simple Coaxial Cable inside. But what we really need to know is the length of the exposed wire (without shielding) affects the signal frequency that it receives.
Which is a good impedance match for a 5 / 8 vertical antenna?
It is found that a 3/4 wavelength vertical element provides a good match, and therefore one solution for providing a good impedance match for the 5/8 wavelength vertical antenna is to make it appear as a 5/8 radiator but have the electrical length of a 3/4 element.