Multi-passband dielectric filter construction having a filter portion including at least a pair of dissimilarly-sized resonators

  • US 5,488,335 A
  • Filed: 10/12/1994
  • Issued: 01/30/1996
  • Est. Priority Date: 01/21/1992
  • Status: Expired due to Term
First Claim
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1. A multi-passband filter construction formed of a dielectric block defining top, bottom, and at least first and second side surfaces, said surfaces being metalized, said filter construction comprising:

  • a first filter circuit portion formed of a first portion of the dielectric block for generating a first filtered signal responsive to application of a first input signal thereto, the first filter circuit portion having at least two resonators, each of the at least two resonators being defined by metalized sidewalls of cavities formed to extend essentially longitudinally along longitudinal axes thereof between the top and bottom surfaces of the dielectric block, wherein a first of the at least two resonators is of a first cross-sectional area of a predetermined configuration and a second of the at least two resonators is of a second cross-sectional area of the same predetermined configuration wherein the first cross-sectional area is dissimilar in area with that of the second cross-sectional area; and

    a second filter circuit portion formed of a second portion of the dielectric block located adjacent to the first portion of the dielectric block of which the first filter circuit is formed, said second filter circuit portion for generating a second filtered signal responsive to application of a second input signal thereto, the second filter circuit portion having at least one resonator defined by metalized sidewalls of at least one cavity formed to extend essentially longitudinally along a longitudinal axis thereof between the top and bottom surfaces of the dielectric block.

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