How the length of antenna is decided?

March 17, 2020 Off By idswater

How the length of antenna is decided?

That wavelength is the required antenna length. The frequency of the electromagnetic waves is related to the wavelength by the well-known equation λ = c/f, where f is the frequency in hertz (Hz), λ is the wavelength in meters (m), and c is the speed of light (2.998 × 108 meters/second).

How does antenna length affect range?

The higher the wavelength, the longer the antenna needs to be to match it properly, and the wavelength is inversely proportional to the frequency. Theoretically, a longer antenna will have a greater range, but it is far more important for optimal radio performance that the length of the antenna matches the frequency.

How do you calculate the 1/4 wavelength of an antenna?

1/4 wave length antenna take 300 and divide by the frequency. So 150 MHz becomes 2 meters, 300 MHz becomes 1 meter, 600 MHz becomes 1/2 meter. Then take the length in meters and multiply by 3.28 to convert to feet (unless you want to remain metric). Take that result and divide by 4 for 1/4 wavelength.

What is effect of increasing length of antenna?

Radio transmission efficiency generally increases with diameter and length of the conductor, but increased antenna length or weight can adversely affect animal behavior.

Why does the length of antenna matter?

So, transmitting antennas are chosen to have a length that makes the electrical interface simpler. For instance, at 0.25λ the impedance is purely resistive at about 37 ohms. You could even choose a length that is a bit short of 0.5λ and get a resistance of over 2000 ohms with no reactive part.

Does the length of a car antenna matter?

In a nutshell, the longer the antenna the more signals it can catch. So for your truck trying to catch the wavelengths of your radio station, typically what is referred to as a quarter-length antenna is best, so that’s about 32 inches long.

Whats better 2m or 70cm?

2m- Good all around band for talking/chatting, but since its VHF, signal travel depends on what’s in its way and the power output of the radio. 70cm- Good band, since its UHF its good to have in the city or around tall buildings or inside of buildings because its wavelength penetrates obstacles better.

How far can you talk from ham radio?

You can realistically get about 2-18 miles of range with a handheld Ham radio unless you have a particularly powerful base station with a large antenna, in which case your range can be hundreds of miles.

What is antenna length?

The BASIC ANTENNA is a DIPOLE-a WIRE with a length equal to HALF A WAVE LENGTH. If a station is operating on a wave length of 100 meters, the dipole to be used at that wave length will be- 100 / 2 = 50 meters, or about 164 feet.

Can an antenna be any length?

Can an antenna be any length? The length of an antenna should be according to the wavelength of the signal to be broadcasted or received. The ideal size for a broadcast antenna with one end on the ground is one-fourth the wavelength i.e. (λ / 4) of the electromagnetic radiation being sent out.