Wave transmission lines and networks – Plural channel systems – Having branched circuits
Patent
1993-05-07
1995-02-07
Gensler, Paul
Wave transmission lines and networks
Plural channel systems
Having branched circuits
333132, 333134, 333136, 370 38, H01P 512
Patent
active
053878868
ABSTRACT:
The invention discloses a three-port filter being able to connect alternately a receiver and a transmitter to a common antenna in a ratio system operating by the time division principle. The first signal path between the first and the third ports comprises all resonators (R1, R2, R3, R4). The second port is connected to one (e.g. R3) of the resonators in the first signal path, whereby a first subset (R1, R2) of resonators lies between the first and the second ports, and a second subset (R3, R4) of resonators forming the signal path between the second and the third ports lies between the second and the third ports. The resonators of either subset are switchable resonators, whose resonance frequencies can be shifted between two frequencies by an external control (Control). At the first control value of the control (Control) the resonators of this subset pass the RF-signal substantially without attenuation, and at the second control value they strongly attenuate said signal.
REFERENCES:
patent: 4987392 (1991-01-01), Clark et al.
patent: 5023935 (1991-06-01), Vancraeynest
Electronic Design, vol. 17, No. 14, 5 Jul. 1969, p. 80 Van Sickle "Simple Duplexer Requires Only Inexpensive Components".
Nappa Pauli
Takalo Tapio
Turunen Aimo
Gensler Paul
LK-Products OY
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