1 4 Wave Antenna Radiation Pattern

It radiates with equal power in all azimuthal directions perpendicular to the antenna.

1 4 wave antenna radiation pattern.

Which means though the antenna radiates it is just some heat dissipation which is a wastage of power. Like a dipole antenna a monopole has an omnidirectional radiation pattern. 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. As there is no radiation pattern no directivity and no gain the full wave dipole is seldom used as an antenna.

The quarter wave vertical antenna is used at all frequency bands including lf mf hf vhf and beyond. The radiating element is a quarter wave λ 4 and the radials are 12 longer. 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 vertical antennas.

This calculator can be used to design a quarter wave ground plane antenna with radials. Radiation is the term used to represent the emission or reception of wave front at the antenna specifying its strength. Dipole radiation pattern horizontal horizontal vertical. The output radiation will be zero for a fullwave transmission dipole.

There are usually four radials three being a minimum but you could use up to six. However the radiated power varies with elevation angle with the radiation dropping off to zero at the zenith of the antenna axis. It radiates vertically polarized radio waves. Ahh the good old quarter wave ground plane.

The quarter wave vertical antenna possesses the attributes of many vertical antennas including the omnidirectional radiation and vertically polarised signals. Maximum gain is now 3 08 dbi. 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.