about driven yagi antennas

[winnie mong]

hi guys..
what happens to the feed resistance of an antenna when the reflector and the director are placed on either side of a dipole?
what happens to the beamwidth when the number of directors are increased?
what is the approximategain of a three element parasitic array?
a circular polarised yagi enables the receiver to obtain signals from...?

 

[davenn]

hi guys..
what happens to the feed resistance of an antenna when the reflector and the director are placed on either side of a dipole?

it generally lowers the feedpoint impedance

what happens to the beamwidth when the number of directors are increased?

it narrows

what is the approximate gain of a three element parasitic array?

6dBi

a circular polarised yagi enables the receiver to obtain signals from...?

commonly used for satellite reception. for CP there will be 2 crossed yagis on the boom and they will be fed out of phase


Dave