Multiband filter circuit and high-frequency transmitter

Details Multiband filter circuit and high-frequency transmitter Multiband filter circuit and high-frequency transmitter

2007-09-18

2007-09-18

Urban, Edward F. (Department: 2618)

Telecommunications

Transmitter

Noise or interference elimination

C333S132000, C333S134000, C333S135000, C455S552100

Reexamination Certificate

active

10844450

ABSTRACT:
The input side and the output side of a first bandpass filter circuit BPF1aare magnetically coupled to each other in a jump-coupling manner by the first mutual inductance (L31a, L41a) for connection between an input port IN and the input side of the first bandpass filter circuit BPF1aand connection between an output port OUT and the output side of the bandpass filter circuit BPF1a. The input side and the output side of a second bandpass filter circuit BPF2awhose center frequency is higher than that of the first bandpass filter circuit BPF1aare magnetically coupled to each other in a jump-coupling manner by the second mutual inductance (L32a, L42a) for connection between the input side of the first bandpass filter circuit BPF1aand the input side of the second bandpass filter circuit BPF2aand connection between the output side of the first bandpass filter circuit BPF1aand the output side of the second bandpass filter circuit BPF2a. This multiband filter circuit is capable of improving the degree of steepness by generating a number of transmission zeros in the vicinity of a plurality of passbands with a simple construction.

REFERENCES:
patent: 6549097 (2003-04-01), Guillon et al.
patent: 2003/0102941 (2003-06-01), Amano et al.
patent: 2000-124705 (2000-04-01), None
patent: 2002-26605 (2002-01-01), None
Yoshihiro Konishi et al., “Design and Applications of filter circuits for communications” 1stEdition Feb. 1, 1994 p. 26, Fig. 2.27 (b).

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