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Directional coupler

  • US 9,077,061 B2
  • Filed: 06/11/2012
  • Issued: 07/07/2015
  • Est. Priority Date: 06/14/2011
  • Status: Active Grant
First Claim
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1. A directional coupler used in a predetermined frequency band, the directional coupler comprising:

  • first, second, third and fourth terminals;

    a main line connected between the first terminal and the second terminal;

    a first sub line that is connected to the third terminal and electromagnetically coupled to the main line;

    a second sub line that is connected to the fourth terminal and electromagnetically coupled to the main line; and

    a phase conversion unit that is connected between the first sub line and the second sub line and that causes a phase shift to be generated in a passing signal passing therethrough;

    whereina cut-off frequency of the low pass filter is not within the predetermined frequency band used in the directional coupler; and

    the phase conversion unit includes a low pass filter.

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