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RADIO FREQUENCY FILTER, RADIO FREQUENCY FRONT-END CIRCUIT, COMMUNICATION DEVICE, AND DESIGN METHOD FOR RADIO FREQUENCY FILTER

  • US 20170346452A1
  • Filed: 08/16/2017
  • Published: 11/30/2017
  • Est. Priority Date: 02/20/2015
  • Status: Active Grant
First Claim
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1. A radio frequency filter comprising:

  • a plurality of communication bandpass filters, each having a pass band corresponding to a different communication band;

    a switch having a common terminal and a plurality of selectable terminals, the plurality of selectable terminals being respectively connected to one of the plurality of bandpass filters; and

    a matching circuit having a first end connected to the common terminal,wherein the matching circuit is common to each of the plurality of communication bandpass filters, andeach of the plurality of communication bandpass filters are configured such that there is less signal transfer loss in the pass band when the bandpass filter is serially connected to the matching circuit than if no matching circuit were present.

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