CIRCUIT AND METHOD FOR RECEIVING OR TRANSMITTING MICROWAVES

摘要

The invention concerns a circuit for receiving (or transmitting) microwaves comprising radiating means (144) for receiving (or transmitting), filtering means for eliminating microwaves received (or transmitted) at different frequencies, by the radiating means, and means for amplifying received (or transmitted) waves. The circuit comprises a first (or last) stage (150, 152; 182, 184) connected to the radiating means including a planar filter (150; 182) whereof the transmission (or reception) rejection rate is limited to a fraction, preferably a very small part, of the total rejection required for eliminating the transmitting (or receiving) frequencies and an amplifier (152; 184) whereof the gain is likewise a fraction of the circuit total gain. Preferably, the first (or last) stage planar filter is directly connected to the radiating element. The noise viewed by the radiating means is minimised.