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Filter with strip lines

  • US 5,432,489 A
  • Filed: 02/08/1994
  • Issued: 07/11/1995
  • Est. Priority Date: 03/09/1992
  • Status: Expired due to Fees
First Claim
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1. A filter device comprising:

  • a filter with at least two resonators for filtering certain frequencies of an electrical signal, a substrate of electrically insulating material separating said resonators from each other, and at least one first strip line disposed on said substrate for coupling a signal which is one of being transmitted to and transmitted from one of said resonators, one end of said first strip line being coupled to one of said resonators and the other end of said first strip line being coupled to one of an input and output port of said filter; and

    a second strip line disposed on said substrate adjacent said first strip line for electromagnetically coupling therebetween, said first and second strip lines forming a directional coupler and one end of said second strip line being coupled to an output port to which a portion of the signal coupled to said first strip line is coupled.

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