ANTENNA TRANSMISSION/RECEPTION COMMON USE CIRCUIT

摘要

PROBLEM TO BE SOLVED: To reduce the power consumption of a transmitter-receiver by reducing a transmission power loss generated by an antenna changeover switch of the transmitter-receiver conducting transmission and reception in time division. SOLUTION: A 1st aperture of an aperture circulator 2 is connected to an antenna 1 and other 2nd and 3rd apertures are connected respectively to aλ/4 transmission line 3 of a reception section system and aλ/4 transmission line 4 of a transmission section system. Switches 5, 6 are connected to the 2nd and 3rd apertures to turn on/off a termination impedance Z0 . A control section 11 is configured to alternately open/close the switches 5, 6 corresponding to a transmission slot and a reception slot.