frequency duplexer low mass and small footprint

摘要

Frequency duplexer intended to be connected to an antenna (4) comprising: a transmission path (64; 102, 402) having a first input port (42); a receive channel (66; 112; 406) having a second output port (44); a road antenna (68; 122; 418) having an input port and output (46); and a connection (50; 108; 410) of the send channel (64; 102, 402) of the reception line (66; 112; 406), and via antenna (68; 122; 418), It is having a first input terminal (56; 126; 412), a second input terminal (58; 128; 414), a third input terminal (60; 130; 416), and effective local connection zone (63 ; 134; 420) input terminals the first, second and third (56, 58, 60; 126, 128, 130; 412, 414, 416); defined between the first input port (42) and the actual junction zone (63; 134; 420) the transmission path (;; 112 406 66) being through the first input terminal (56, 126, 412), It is configured to operate at a first frequency f1 emission being adapted to the first frequency f1 in a real characteristic impedance R0 and to pass a first electromagnetic power default to the first frequency f1, and comprising serially connected from the first input port an emission filter (52) and a first adapter element (61; 104; 404); the reception line (66; 112; 406) being delimited between the actual junction zone (63; 134; 420) and the second output port (44) through the second input terminal (58; 128; 414), It is configured to operate at a second frequency f2 receiving being adapted to the characteristic impedance R0 and comprising successively connected in series from the actual junction zone (63; 134; 420) a receive filter (54) and a second element adaptation (62; 114; 408); delimited between the actual junction zone (63; 134; 420) and the third input port and output (46) through the third input terminal (60; 130 via antenna (;; 122418 68) being; 416) being configured to operate at first and second frequencies f1, f2 being adapted to the characteristic impedance R0; and the emission filter (52) configured to pass the first frequency f1 emission and reject the second frequency f2 being reception; the receiving filter (54) configured to pass the second frequency f2 and reception frequency f1 reject the first emission to a rejection level rej1 with respect to the second frequency f2 being; characterized in that the emission filter (52) is made of a first technology characterized by a first resistor of maximum input power and the reception filter (54) is made of a second technology characterized by a second resistance maximum input power; rejection rej1 receive filter (54) to the first frequency f1 is selected so that, when the reception filter (54) is adapted by adjusting the impedance of the second adapter element (62; 114; 408) to present a substantially real and maximum impedance R to the first frequency f1 in the actual junction zone (63; 134; 420), the ratio of maximum R actual impedance and the characteristic resistance R0 expressed in dB is greater than the difference expressed between the first resistance and the second peak power at maximum power resistance, while the first and second resistors maximum input power expressed in dBm.