Receiving apparatus

Details Receiving apparatus Receiving apparatus

1997-04-01

2000-06-06

Eisenzopf, Reinhard J.

Telecommunications

Receiver or analog modulated signal frequency converter

With wave collector

155327, 155307, 333175, 333202, H04B 110

Patent

active

060729996

ABSTRACT:
A receiving apparatus is presented, in which a channel frequency can be selected over a wide band with an increased attenuation at an image frequency and/or at a local oscillation frequency by including a tunable filter having a following construction. Microstrip lines are connected between either one of the input or the output terminal or both of the input and output terminals of the tunable filter; a plurality of resonant circuits are formed by each of a plurality of coils and a plurality of variable capacitance diodes; and the coils are electromagnetically coupled and where a voltage applied to each cathode of each of a plurality of variable capacitance diodes through each of a plurality of resistors is controlled to tune a frequency to be received.

REFERENCES:
patent: 4340975 (1982-07-01), Onishi et al.
patent: 4408348 (1983-10-01), Theriault
patent: 4601062 (1986-07-01), Hettiger
patent: 4619001 (1986-10-01), Kane
patent: 4677693 (1987-06-01), Takayama
patent: 4835499 (1989-05-01), Pickett
patent: 4905306 (1990-02-01), Anderson
patent: 4956710 (1990-09-01), Pugel
patent: 5256997 (1993-10-01), Inagaki
patent: 5392011 (1995-02-01), Li
patent: 5715531 (1998-02-01), Liu et al.
European Search Report corresponding to application No. EP 97 30 2071 dated Jun. 17, 1998.

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