1 4 Wave Antenna Radiation Pattern

The gain of a 5 8th wave over a 1 4 wl antenna at 2 degrees is now 2 19 db but the peak gain of the 5 8th wave is only 01db different than the peak gain of a 1 4 wave antenna.

1 4 wave antenna radiation pattern.

Antenna should be 1 m long for 450 mhz one wavelength is 67 cm and the antenna should be 33 cm long. The quarter wave vertical antenna is used at all frequency bands including lf mf hf vhf and beyond. Ahh the good old quarter wave ground plane. Radiation is the term used to represent the emission or reception of wave front at the antenna specifying its strength.

It radiates vertically polarized radio waves. Which means though the antenna radiates it is just some heat dissipation which is a wastage of power. It radiates with equal power in all azimuthal directions perpendicular to the antenna. This is the vertical radiation pattern of a ground plane antenna over a so called perfect ground.

Box 1471 r r 1 5697 concession 6 everett ontario canada l0m 1j0 phone. William orr radio handbook 22 nd edition howard w. The output radiation will be zero for a fullwave transmission dipole. In any illustration the sketch drawn to represent the radiation of an antenna is its radiation pattern one can simply understand the function and directivity of an antenna by having a look at its radiation pattern.

At 2 degrees takeoff the 1 4 wl antenna over good soil with perfectly flat terrain has 6 75 dbi gain. This calculator can be used to design a quarter wave ground plane antenna with radials. As there is no radiation pattern no directivity and no gain the full wave dipole is seldom used as an antenna. There are usually four radials three being a minimum but you could use up to six.

Like a dipole antenna a monopole has an omnidirectional radiation pattern. The radiating element is a quarter wave λ 4 and the radials are 12 longer. The quarter wave vertical antenna possesses the attributes of many vertical antennas including the omnidirectional radiation and vertically polarised signals. 1 4 wave vertical antennas.