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All-acoustic duplexers using directional couplers

  • US 9,866,201 B2
  • Filed: 07/22/2016
  • Issued: 01/09/2018
  • Est. Priority Date: 09/08/2015
  • Status: Active Grant
First Claim
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1. A radio frequency (RF) duplexer, comprising:

  • at least a first port, a second port, and a third port; and

    a plurality of acoustic components comprising at least;

    a first acoustic filter that is coupled to the first port;

    a second acoustic filter;

    a third acoustic filter that is substantially similar to the second acoustic filter;

    a first acoustic quadrature hybrid coupler that is configured to couple signals from the first acoustic filter and the third port to the second acoustic filter and the third acoustic filter; and

    a second acoustic quadrature hybrid coupler that is configured to couple signals from the second acoustic filter and the third acoustic filter to the second port,wherein the third port is a common port to the first port and the second port,wherein the first port and the second port are isolated, andwherein a transfer function between the first port and the third port and a transfer function between the second port and the third port have passbands at different frequencies as determined by the first acoustic filter, the second acoustic filter, and the third acoustic filter.

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