The effects of crosspolarisation and copolar in microstrip patch antenna
can anybody ..expalain me the effect of crosspolarisation and copolar in microstrip patch antenna.other parameter also such as vswr ,return loss,gain,...etc
i need to do presentation...
plz help me
regards
alan
This stands for all antennas.
Crosspolarization is polarization of EM waves which is moved for 90° from main of your antenna (for example if your antenna have vertical polarisation, horizontal polarization is crosspolarization for you.).
Theoretically crosspolarization do not affect you at all, but in real life it is quite different.
I try will try to put it short, but i suggest to you to look in attachment.
Gain, Directivity, and Effective Aperture.
The ability of an antenna to concentrate energy in a narrow angular region (a directive beam) is described in terms of antenna gain.
Two different but related definitions of antenna gain are directive gain and power gain. The former is usually called directivity, while the latter is often called gain. It is important that the distinction between the two be clearly understood.
Directivity (directive gain) is defined as the maximum radiation intensity (watts per steradian) relative to the average intensity.
Gain (power gain) does involve antenna losses and is defined in terms of power accepted by the antenna at its input port P0 rather than radiated power P.
For realistic (nonideal) antennas, the power radiated Pt is equal to the power accepted P0 times the radiation efficiency factor TQ of the antenna.
Effective Aperture. The aperture of an antenna is its physical area projected on a plane perpendicular to the main-beam direction. The concept of effective aperture is useful when considering the antenna in its receiving mode.