Filter circuit

Details Filter circuit Filter circuit

2007-01-23

2007-01-23

Nguyen, Linh (Department: 2819)

Wave transmission lines and networks

Coupling networks

Wave filters including long line elements

C333S202000, C333S230000

Reexamination Certificate

active

10753336

ABSTRACT:
A filter circuit has a complex block and exciting portions. The complex block has: a first block end resonator; a first resonator that is coupled to the first block end resonator; a second resonator that is coupled to the first resonator; a third resonator that is coupled to the second resonator; a fourth resonator that is coupled to the third resonator; and a second block end resonator that is coupled to the fourth resonator. Couplings between the first block end resonator and the second block end resonator, between the first resonator and the fourth resonator, and between the second resonator and the third resonator are in phase. The complex block and the exciting portions are single-path-coupled.

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Gerhard Pfitzenmaier, “Synthesis and Realization of Narrow-Band Canonical Microwave Bandpass Filters Exhibiting Linear Phase and Transmission Zeros”, IEEE Trnasactions on Microwave Theory and Techniques, vol. MTT-30, No. 9, Sep. 1982, pp. 1300-1311.
Ralph Levy, “Direct Synthesis of Cascaded Quadruplet (CQ) Filters”, IEEE Trnasactions on Microwave Theory and Techniques, vol. 43, No. 12, Dec. 1995, pp. 2940-2945.
Richard J. Cameron, et al., “Asymmetric Realizations for Dual-Mode Bandpass Filters”, IEEE Trnasactions on Microwave Theory and Techniques, vol. MTT-29, No. 1, Jan. 1981, pp. 51-58.

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