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Antenna Coupling and Out of Band Interference Effects on a High Precision GNSS Receiver

In this work we analyze the coupling between two patch antennas designed to be placed on a vehicle. One antenna transmits high power signals, while the other antenna is intended for receiving signals of global satellite navigation systems (GNSS). Although both antennas operate in different frequency bands, the out of band interference generated by the transmitting antenna can affect the performance of the GNSS receiver because of its high sensitivity. In addition, other intentional or unintentional out of band interferences coming from different sources represent a risk for the receiver. Simulation and measurement results show that due to the coupling between the antennas, the interference produced by the transmitter has a detrimental effect on the GNSS receiver. Several solutions to overcome this problem are presented and evaluated according to the requirements of the current application.