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Communication device and method for coupling transmitter and receiver

  • US 20020086644A1
  • Filed: 12/20/2001
  • Published: 07/04/2002
  • Est. Priority Date: 12/29/2000
  • Status: Abandoned Application
First Claim
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1. A radio frequency communication device comprising a transmitter and a receiver, and a switch circuit comprising a transmitter branch and a receiver branch coupled to a common coupling point in order to alternately couple an output of the transmitter and an input of the receiver to said coupling point, wherein the transmitter branch comprises a first transmission line which has a determined characteristic impedance and which is arranged to be coupled to the transmitter having a first impedance when the transmitter is switched on and a second impedance when the transmitter is switched off, and in that said first impedance is in the order of the characteristic impedance of said first transmission line without causing an impedance conversion and allowing signal propagation in the transmitter branch, and in that said second impedance is a low impedance in comparison to the characteristic impedance of said first transmission line, causing, as a result of an impedance conversion, a high impedance preventing signal propagation in the transmitter branch, and in that said coupling is implemented by switching the transmitter on and off.

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