Wave-guide band rejection filter having a short circuited coaxia

Details Wave-guide band rejection filter having a short circuited coaxia Wave-guide band rejection filter having a short circuited coaxia

1990-11-29

1992-04-14

LaRoche, Eugene R.

Wave transmission lines and networks

Coupling networks

Wave filters including long line elements

333232, 333235, H01P 1207

Patent

active

051051745

ABSTRACT:
A band rejection filter for a microwave wave-guide formed of a wave-guide (11) and at least one short-circuited coaxial line. An inner conductor (17) and an outer conductor (19) are coaxial with the inner conductor (17) being a conducting rod extending a screw (12) and the outer conductor being at least in part a tapped hole (19) formed in the wall of the wave-guide (11). The screw (12) forms an adjustable short-circuit. The short-circuited coaxial line has a length slightly less than an odd multiple of a quarter wavelength corresponding to the central frequency of the frequency band to be rejected, so as to form an inductive susceptance. The end of the inner conductor (17) projects slightly into the wave-guide (11) to form a capacitive susceptance which is connected to the end of the coaxial line so as to form a resonator tuned to the central frequency of the band to be rejected.

REFERENCES:
patent: 2645679 (1953-07-01), Reade
patent: 3876963 (1975-04-01), Graham
patent: 4035749 (1977-07-01), Slocum et al.
patent: 4380747 (1983-04-01), Curtinot et al.
patent: 4746883 (1988-05-01), Sauvage et al.
patent: 4752753 (1988-06-01), Collins et al.
patent: 4780693 (1988-10-01), Elliott et al.
Review of the Electrical Communication Laboratories, vol. 18, No. 7/8, Jul. 1970, Tokyo, Japan, pp. 493---511; H. Sugahara et al.: "Small-sized channel branching filter for microwave".

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