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System and method for a directional coupler

  • US 9,947,985 B2
  • Filed: 07/20/2015
  • Issued: 04/17/2018
  • Est. Priority Date: 07/20/2015
  • Status: Active Grant
First Claim
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1. A method of operating a directional coupler, the method comprising:

  • determining a coupled power variation byapplying an input signal at an input port of the directional coupler,applying a first impedance at a transmitted port of the directional coupler,measuring a first coupled power at a coupled port of the directional coupler after applying the first impedance,applying a second impedance at the transmitted port of the directional coupler, wherein the second impedance is different from the first impedance,measuring a second coupled power at the coupled port of the directional coupler after applying the second impedance,determining a difference between the first coupled power and the second coupled power to form the coupled power variation, wherein the directional coupler is configured to provide to the coupled port of the directional coupler a first signal proportional to a first radio frequency (RF) signal propagating from the input port of the directional coupler to the transmitted port of the directional coupler, and is configured to provide to an isolated port of the directional coupler a second signal proportional to a second RF signal propagating from the transmitted port of the directional coupler to the input port of the directional coupler; and

    adjusting a termination impedance coupled to the isolated port of the directional coupler when the coupled power variation exceeds a predetermined threshold.

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