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Switchable directional coupler for use with RF devices

  • US 7,546,089 B2
  • Filed: 07/11/2005
  • Issued: 06/09/2009
  • Est. Priority Date: 12/23/2004
  • Status: Expired due to Fees
First Claim
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1. A radio frequency (RF) transceiver, comprising:

  • an RF transmitter;

    an RF receiver; and

    a directional coupler switchable between a normal state and a bypass state and coupled between an antenna and the RF transmitter and between the antenna and the RF receiver, the directional coupler in the normal state allowing passage of a large portion of a transmit signal from the RF transmitter to the antenna and coupling a portion of a received RF signal from the antenna to the RF receiver, the directional coupler in the bypass state directing the received RF signal from the antenna to the RF receiver with a single switch,wherein the directional coupler comprises first and second transmission lines each extending between first and second ends, a first shunt switch coupled to the first end of the first transmission line, a second shunt switch coupled to the first end of the second transmission line, and a third shunt switch coupled between the second end of the first transmission line and the second end of the second transmission line.

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