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Patch Antenna knowledge
Jun 30, 2017

patch antennas are the most common type of antenna due to their durability and ease of manufacture. Its shape can be round or square or rectangular, like a copper printed circuit board. It consists of one or more metal pieces, so the most commonly used shape of the GPS antenna is a massive knot, like a biscuit. Since the antenna can be made very small, it is suitable for aerospace applications and personal handheld applications.


Another major characteristic of the antenna is its gain pattern, ie, the directionality. Using the antenna's directivity can improve its anti-dry and anti-multipath effects. In the precise positioning, the stability of the phase center of the antenna is a very important indicator. However, in conventional navigation applications, it is desirable to use at least an omni-directional antenna to receive at least visible satellite signals in all the sky within five degrees of horizon, but the flattened antenna is the largest when the satellite is above the antenna , There are two questions:


1, the patch antenna to receive the range above the flat, flat to the sky, which for the handheld and the car will bring trouble, we can see the adjustable angle of the CF receiver more and more (foldable SDGPS Leader 9551) It is because the flat-panel antenna this feature makes the manufacturers in order to have a better reception effect of the receiver would like to come out of the move.


2, we know that although we are on top of the satellite signal is better, easier to lock, but in fact the top of the satellite is the most useless, if there is no low-angle satellite, the error will be relatively high, the accuracy will be difference. So based on these shortcomings, GPS receiver also began to use four-arm helical antenna.