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Ceramic duplex filter

  • US 5,239,279 A
  • Filed: 03/31/1992
  • Issued: 08/24/1993
  • Est. Priority Date: 04/12/1991
  • Status: Expired due to Term
First Claim
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1. A ceramic duplex filter, comprising:

  • a single monolithic ceramic block having a first elongated filter for connection to a receiver branch and a second elongated filter for connection to a transmitter branch, said first elongated filter block having a first plurality of resonators including a first resonator, said second elongated filter block having a second plurality of resonators including a last resonator, each of the resonators being composed of a portion of dielectric material having top, bottom and at least two side surfaces with a respective hole extending from said top surface to said bottom surface, the first resonator of said first plurality of resonators of said first elongated filter and said last resonator of said second plurality of resonators of said second elongated filter being neighboring resonators which are adjacent each other along a dividing line, the top, bottom and at least a first of the side surfaces being generally covered with an electrically conducting material, a second of the side surfaces being at most partially covered with electrically conductive material; and

    conductive strip means for substantially cancelling out electric and magnetic fields between said neighboring resonators, said conductive strip means including at least one conductive strip located along the dividing line on the second side surface and extending generally straightly between the conductive material on the top and bottom surfaces, said conductive strip being elongated in a direction parallel to a direction of elongation of the resonator hole.

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