Tuneable ultra-high frequency filter with mode TM010 dielectric resonators
First Claim
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1. A tuneable ulta-high frequency filter operating in the TM010 mode, comprising:
- a rectangular metal case having a base, a lid and a longitudinal axis parallel to said base, said case being and dimensioned to form a below cut-off ultra-high frequency waveguide;
input means, connected to said case, adapted for receiving an ultra-high frequency signal;
output means, connected to said case, for providing an output signal;
a succession of cylindrical, dielectric resonators disposed inside said case in a line parallel to said longitudinal axis, each said resonator having a resonant portion touching said base and an end which is at an adjustable distance from said lid; and
means for adjusting said adjustable distance whereby frequency tuning of said filter may be accomplished and an electromagnetic field in the vicinity of said resonators resonates in the TM010 mode.
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Abstract
A filter comprising a metal case having a metal base and a lid forming a guide of any section but under cut-off, that is to say which does not allow guided propagation. Cylindrical dielectric resonators are in contact with the metal securing base and the resonators resonate then in the TM010 mode. For frequency tuning of the filter, the distance between the bottom of the lid and the ends of the dielectric resonators supported by the base is variable. The invention applies more especially to tuneable band-pass filters.
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Citations
7 Claims
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1. A tuneable ulta-high frequency filter operating in the TM010 mode, comprising:
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a rectangular metal case having a base, a lid and a longitudinal axis parallel to said base, said case being and dimensioned to form a below cut-off ultra-high frequency waveguide; input means, connected to said case, adapted for receiving an ultra-high frequency signal; output means, connected to said case, for providing an output signal; a succession of cylindrical, dielectric resonators disposed inside said case in a line parallel to said longitudinal axis, each said resonator having a resonant portion touching said base and an end which is at an adjustable distance from said lid; and means for adjusting said adjustable distance whereby frequency tuning of said filter may be accomplished and an electromagnetic field in the vicinity of said resonators resonates in the TM010 mode. - View Dependent Claims (2, 3, 4, 5, 6)
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7. An electrically tunable ultra-high frequency filter operating in the TM010 mode, comprising:
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a rectangular case including a base, a lid, two side-walls with ferrite materials disposed thereon, a longitudinal axis parallel to said base and said sidewall, said case dimensioned to form a below cut-off ultra-high frequency waveguide; input means, connected to said case, for providing an input signal; output means, connected to said case, for providing an output signal; a succession of cylindrical dielectric resonators disposed inside said case in a line parallel to said longitudinal axis, each said resonator having a resonant portion with a first end touching said base and a second end at a fixed distance from said lid; and coil means, disposed outside of said case, for supplying a variable magnetic field to said ferrite materials to cause said filter to be electrically tuned.
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Specification