# What is quarter wavelength antenna?

## What is quarter wavelength antenna?

The monopole is often used as a resonant antenna; the rod functions as an open resonator for radio waves, oscillating with standing waves of voltage and current along its length. The most common form is the quarter-wave monopole, in which the antenna is approximately one quarter of the wavelength of the radio waves.

How long is a quarter wave CB antenna?

The Laird – Antenex C27 is a 1/4 wave, unity gain CB radio antenna that is tunable for CB frequency range (26.965 – 27.406 MHz) and 10 Meter range ( 28 MHz – 29.7 MHz). This antenna works like a 102 inch whip antenna but is ONLY 53 INCHES LONG! This is accomplished by using a DC grounded base coil construction.

### What is a 1/4 wave antenna?

The size of a 1/4-wave antenna is approximately one-quarter of the wavelength of the desired frequency, and the 1/2-wave is one-half the wavelength. Therefore, a 1/2-wave receiver antenna would be about 3 feet (1 m) long, and a 1/4-wave antenna would be about 18 inches (45 cm).

How do you calculate the wavelength of an antenna?

The 492/f formula is for an ideal antenna in free space, the 468/f is an estimate for real antennas at a reasonable height over ground. This gives the length of a full wavelength in meters. This formula is correct if the conductor is infinitely thin and other objects are infinitely far away from the antenna.

#### What is wavelength of antenna?

The condition for resonance in an antenna is that the wavelength of the standing wave is twice the length of the antenna (see the above animated diagram). λSW=2Lant. We can relate the wavelength to the frequency of oscillation by λf=c. where f is the frequency and c is the speed of light in the antenna.

What is the wave on a CB antenna?

Answer: A wave , or wavelength is determined by what frequency one is operating on. Because CB operates primarily in the 27 MHz band of frequencies between 26.965 (Channel One) and 27.405 (Channel Forty), many consider either ch19 (27.185) or ch20 (27.205) to be the center of the CB band.

## How to calculate a quarter wave ground plane antenna?

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. The radiating element is a quarter wave (λ/4) and the radials are 12% longer. There are usually four radials, three being a minimum, but you could use up to six.

How tall is a quarter wave vertical whip antenna?

One common mobile antenna is a quarter-wave vertical whip. This is roughly nine feet (2.7 metres) tall and mounted low on the vehicle body, and often has a spring and ball mount. A electrical length, and to enhance its resilience to scraping and striking overhead objects.

### How to calculate the distance of a CB antenna?

You can calculate the distance of a wavelength in free space for CB Channel 40 uses the frequency 27.405MHz. So we want to make a antenna that is resonant on channel 40 and not too large in size. Lets cut a straight piece of aluminum rod to be 1/2 a wavelength long.

How to calculate the wavelength of an antenna?

This calculator will help you to calculate the different wavelength of antennas based on the frequency. Just copy and paste the below code to your webpage where you want to display this calculator. This tool will help you dynamically to calculate antenna wave length.