Wave transmission lines and networks – Resonators – Coaxial or shielded
Patent
1982-11-30
1985-03-19
Nussbaum, Marvin L.
Wave transmission lines and networks
Resonators
Coaxial or shielded
29600, 333206, 333219, H01P 704, H01P 710
Patent
active
045062412
ABSTRACT:
A coaxial dielectric resonator for VHF-UHF band comprises a generally cylindrical dielectric body having a thick portion, a thin portion and a stepped portion interposed between the thick and thin portion. The outer and inner surfaces of the dielectric body are respectively covered by outer and inner conductors. Thus the resonator can be regarded as a series circuit of two lines having different impedance from each other. The axial length of the thick and thin portions may be changed so as to change electrical characteristics. With the provision of thick and thin dielectric portions, the spurious resonance frequencies may be set to values other than integral multiples of the fundamental resonance frequency. The stepped portion may be rounded or replaced with a tapered portion so that impedance gradually changes at the stepped or tapered portion from the thick portion to the thin portion or vice versa.
REFERENCES:
patent: 2859418 (1958-11-01), Vogelman
patent: 3872412 (1975-03-01), Seidel
patent: 4276525 (1981-06-01), Nishikawa et al.
patent: 4342972 (1982-08-01), Nishikawa et al.
patent: 4371853 (1983-02-01), Makimoto et al.
Aihara Yukichi
Makimoto Mitsuo
Yamashita Sadahiko
Matsushita Electric - Industrial Co., Ltd.
Nussbaum Marvin L.
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