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Structure of dual directional couplers for multiple-band power amplifiers

  • US 9,647,314 B1
  • Filed: 05/07/2015
  • Issued: 05/09/2017
  • Est. Priority Date: 05/07/2014
  • Status: Active Grant
First Claim
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1. A directional coupler for a wireless communication device, the directional coupler comprising:

  • a first transmit line having a first input port and a first output port respectively configured to receive and provide a first signal to be transmitted from the wireless communication device;

    a second transmit line having a second input port and a second output port respectively configured to receive and provide a second signal to be transmitted from the wireless communication device;

    a coupling line having (i) a first portion coupled to the first transmit line, (ii) a second portion, in series with the first portion, coupled to the second transmit line, and (iii) a coupled port configured to selectively provide a coupled signal corresponding to each of, in respective modes, the first signal and the second signal; and

    a second coupled port configured to provide a second coupled signal corresponding to each of, in respective modes, the first signal and the second signal, whereinthe coupled port corresponds to a forward coupled port and the second coupled port corresponds to a reverse coupled port,the first transmit line includes a first portion and a second portion arranged in series, wherein (i) the first portion of the first transmit line is coupled to the portion of the first coupling line and (ii) the second portion of the first transmit line is coupled to a second coupling line corresponding to the second coupled port, andthe second transmit line includes a first portion and a second portion arranged in series, wherein (i) the first portion of the second transmit line is coupled to the second portion of the first coupling line and (ii) the second portion of the second transmit line is coupled to the second coupling line corresponding to the second coupled port.

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