Filter for short electromagnetic waves formed as a comb line or

Details Filter for short electromagnetic waves formed as a comb line or Filter for short electromagnetic waves formed as a comb line or

1987-07-02

1988-07-12

Nussbaum, Marvin L.

Wave transmission lines and networks

Coupling networks

Wave filters including long line elements

333202, 333219, 333235, H01P 1205, H01P 700

Patent

active

047572850

ABSTRACT:
Microwave filters which have the best electrical characteristics for small volumes are required in radio communications particularly in traffic broadcast communication links and the invention provides filters formed as comb line or interdigital line filters in which the inner resonator conductors are formed as flat spirals.

REFERENCES:
patent: 2751558 (1956-06-01), Grieg
patent: 3210697 (1966-10-01), Comstock
patent: 3836881 (1974-09-01), Koizumi
patent: 3864824 (1975-02-01), Watson et al.
patent: 3895325 (1975-07-01), Fischer et al.
patent: 4468644 (1984-08-01), Teague et al.
7th European Microwave Conference--Conference Proceedings, published by Microwave Exhibitions and Publishers Inc., pp. 450-454, Monday 5 to Thursday 8, Sep. 1987.
Proceedings of the IEEE, Jan. 1979, vol. 67, No. 1, published by The Institute of Electrical and Electronics Engineers--Miniaturization of Wide-Band VHF Filters by Using Spiral Resonators--Inui and Nagai; pp. 20-24.
Spiral Resonator for PCM-400 M System--Nishi, Yanagisawa and Toshima, vol. 24, Nos. 9-10, Sep., Oct., 1976; pp. 776-786, Review of the Electrical Communication Laboratories.
The Design of Filters Using Helical Resonators in the VHF Band, by B. K. Dube, J. Instn. Electronics Telecom. Expos Vol. 22, 1976, No. 2PP77-79, 1976.
Band-Passand Band-Stop Microwave Filter Using .lambda./4 Circular Cylindrical Rod Resonators, by Yukio Ito, Takeshi Meguro, Dec. 1968, vol. 4, No. 3, Fujitsu Scientific and Technical Journal, p. 2853.
Patent Abstracts of Japan, Unexamined Application, E. Field, Nov. 2, 1983, The Patent Office Government, vol. 7, No. 247 (E-208 1392 58-133088/58 136255).
Patents Abstracts of Japan, Unexamined Applications, Aug. 11, 1977, E Section--The Patent Office, Japanese Government, vol. 1, No. 86; pp. 233-236.

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