Compact step tuned filter

Details Compact step tuned filter Compact step tuned filter

1985-02-28

1985-12-24

Nussbaum, Marvin L.

Wave transmission lines and networks

Coupling networks

Wave filters including long line elements

333204, 333222, 333246, H01P 1203, H01P 708

Patent

active

045609640

ABSTRACT:
A compact step tuned filter (30, FIG. 6), is provided for passing two or more widely separated microwave frequencies and providing high rejection to signals below the passband, and is particularly useful in miniaturized light weight airborne step tuned mixers and the like. The filter includes input and output sets (39-40, 41-42) of parallel coupled transmission lines providing lumped element capacitors at the lower frequency and matched transmission lines at the higher frequency, and a central transmission line connected between the input and output sets of coupled lines and providing a resonator between the lumped element capacitors at the lower frequency and a matched transmission line at the higher frequency.

REFERENCES:
patent: 3104362 (1963-09-01), Matthaei
patent: 3896402 (1975-07-01), Jackson
patent: 4418324 (1983-11-01), Higgins
G. L. Matthaei, L. Young and E. M. T. Jones, "Microwave Filters, Impedance-Matching Networks and Coupling Structures," McGraw-Hill, 1964, pp. 83-104, 175, 221, 440-450, 584-595.
T. G. Bryant and J. A. Weiss, "Parameters of Microstrip Transmission Lines and Coupled Pairs of Microstrip Lines," IEEE Trans., vol. MTT-16, Dec. 1968, pp. 1021-1027.
M. Makimoto and S. Yamashita, "Strip-Line Resonator Filters having Multi-Coupled Sections," Digest of IEEE MTT-S Symposium, May 1983, pp. 92-94.
S. B. Cohn, "Parallel-Coupled Transmission-Line-Resonator Filters", IRE Trans, vol. MTT-6, Apr. 1958, pp. 223-231.
P. A. Kirton and K. K. Pang, "Extending the Realizable Bandwidth of Edge-Coupled Stripline Filters," IEEE Trans, vol. MTT-25, Aug. 1977, pp. 672-676.
B. J. Minnis, "Printed Circuit Coupled-Line Filters for Bandwidths up to and Greater than an Octave," IEEE Trans, vol. MTT-29, Mar. 1981, pp. 215-221.
D. Rubin and A. Hislop, "Millimeter-Wave Coupled Line Filters," Microwave Jour., Oct. 1980, pp. 67, 69-71, 78.

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