why antenna should have horizontal polarization

[myata]

Hello,
In one paper stated, that their receiving antennas should be omnidirectional and have horizontal polarization. Why they need horizontally polarized antennas for that?
Thanx

 

[davenn]

given that you havent given us any context for who "they" are or what "they" are trying to do
for a horizontally polarised antenna to be near omni directional it would have to be a loop
pretty much any other form of horizontal antenna WONT be omni-directional

Dave

 

[vfone]

In 1930's RCA discovered on their first TV broadcast transmissions in VHF bands that horizontal polarization gave better reception at greater distances than vertical polarization.
In line-of-sight (LOS) is almost no difference between H and V polarization, but when the waves starts to follow the horizon curvature (beyond line-of-sight BLOS), H polarized waves propagates longer distances due to ground enhanced tropospheric scatter.

 

[Audioguru]

When Brits were driving on the wrong side of the road, their TV antennas had vertical polarization and their signals reflected like mad off tall buildings.

 

[FvM]

As an omnidirectional characteristic is usually unwanted for a TV antenna, it's unlikely that the paper refers to TV antennas.

In fact, omnidirectional directivity can be mostly found with vertically polarized antennas, e.g. for GSM, FM-radio, WiFi.

 

[myata]

Thank you all for replies.
The paper is denoted to antenna array for radar application. And yes they used loop antennas, but I can't understand what's advantage of using antenna with horizontal polarization in this case (especially when, as what previously mentioned, most of omni antennas have vertical polarization).

 

[tony_lth]

Maybe it is related to reflection.
Radar emits a H wave, then receives a H wave.