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High-frequency front end circuit and spurious-wave suppressing method

  • US 10,491,250 B2
  • Filed: 04/18/2018
  • Issued: 11/26/2019
  • Est. Priority Date: 10/19/2015
  • Status: Active Grant
First Claim
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1. A high-frequency front end circuit that, among a plurality of communication channels within a frequency band of a system, determines a wireless communication channel that is not used by the system on which to perform wireless communication, the high-frequency front end circuit comprising:

  • a filter configured to attenuate a high-frequency signal outside the frequency band; and

    a variable filter having a variable pass band and/or a variable attenuation band, wherein;

    frequencies of at least one of the plurality of communication channels are within the attenuation band, the at least one communication channel being used by the system and being a channel that causes an interference wave occurring in a neighbor frequency domain that includes the wireless communication channel not used by the system, andfrequencies of the interference wave caused by the at least one communication channel and occurring in the neighbor frequency domain that includes the wireless communication channel not used by the system are within the pass band.

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