1 4 Wave Antenna Radiation Pattern

As there is no radiation pattern no directivity and no gain the full wave dipole is seldom used as an antenna.

1 4 wave antenna radiation pattern. Ahh the good old quarter wave ground plane. It radiates vertically polarized radio waves. 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 possesses the attributes of many vertical antennas including the omnidirectional radiation and vertically polarised signals.

At 2 degrees takeoff the 1 4 wl antenna over good soil with perfectly flat terrain has 6 75 dbi gain. This is the vertical radiation pattern of a ground plane antenna over a so called perfect ground. Dipole radiation pattern horizontal horizontal vertical. Like a dipole antenna a monopole has an omnidirectional radiation pattern.

1 4 wave vertical antennas. However the radiated power varies with elevation angle with the radiation dropping off to zero at the zenith of the antenna axis. William orr radio handbook 22 nd edition howard w. 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. There are usually four radials three being a minimum but you could use up to six. The quarter wave vertical antenna is used at all frequency bands including lf mf hf vhf and beyond. This calculator can be used to design a quarter wave ground plane antenna with radials.

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. The radiating element is a quarter wave λ 4 and the radials are 12 longer. Box 1471 r r 1 5697 concession 6 everett ontario canada l0m 1j0 phone.