GPS antennas = circular polarized？

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senmeis

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Hi,

I read almost all the GPS antennas are circular polarized. Is it also true for satellite receiving antennas?
 

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Yes, that would make best use of the available signal.

But I have already designed GNSS receive antennas with linear polarisation for special cases where circular was not possible.
 

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Polarization loss between linear polarization (vertical or horizontal) and circular polarization is 3dB.
The average GPS free-space path loss is about 122dB (for average satellite altitude ~20200km). At this path loss, is not such important another 3dB extra loss.
 

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