High-frequency switch including strip line and two switching dio

Details High-frequency switch including strip line and two switching dio High-frequency switch including strip line and two switching dio

1993-12-21

1996-04-09

Pham, Chi H.

Telecommunications

Transmitter and receiver at same station

With transmitter-receiver switching or interaction prevention

455 83, 333101, H04B 144, H01P 110

Patent

active

055070116

ABSTRACT:
A transmitting circuit is connected to an antenna via a first diode. The antenna is connected to a receiving circuit with the circuit including a strip line and a second diode. Two diodes are turned ON by applying a positive voltage to a first control terminal. In this state, a signal from the transmitting circuit is transmitted from the antenna. The transmission signal is not transferred to the receiving circuit side due to a series resonance circuit with the inductance of the second diode and a capacitor. When the high-frequency switch is used for reception, a positive voltage is applied to a second control terminal. The voltage is divided by a resistors respectively connected to the diodes in parallel, and applied to the diodes as a backward voltage. And hence, the diodes are surely maintained in the OFF state. The isolation between the transmitting circuit and the antenna is improved by a parallel resonance circuit with the capacitance of the first diode and a inductor.

REFERENCES:
patent: 3452299 (1969-06-01), Angel
patent: 4055807 (1977-10-01), Priniski et al.
patent: 5023935 (1991-06-01), Vancraeynest
patent: 5193218 (1993-03-01), Shimo

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