Antenna sharing device using mutually coupled resonant circuits

Details Antenna sharing device using mutually coupled resonant circuits Antenna sharing device using mutually coupled resonant circuits

1992-09-14

1994-02-08

Pascal, Robert J.

Wave transmission lines and networks

Coupling networks

Frequency domain filters utilizing only lumped parameters

333132, 333129, 333175, 455 41, 455 82, 455 83, H03H 700

Patent

active

052851770

ABSTRACT:
An antenna sharing device having a transmission filter connectable between a branch node of an antenna and a transmitter and a reception filter connectable between the branch node and a receiver. At least one of the transmission filter and the reception filter includes: a first parallel resonance circuit having a capacitor and a coil connected in parallel; a second parallel resonance circuit magnetically coupled to the first parallel resonance circuit; and a capacitor serially connected to the first parallel resonance circuit. One of the first and second parallel resonance circuits has a first resonance frequency, the other of the first and second parallel resonance circuits has one of the first resonance frequency and a second resonance frequency, and a combination of the first and second parallel resonance circuits and the capacitor forms an equivalent circuit providing a small insertion impedance at a third resonance frequency.

REFERENCES:
patent: 4980660 (1990-12-01), Nakamura

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