Development of Transmitter/Receiver Front-End Module with Automatic Tx/Rx Switching Scheme for Retro-Reflective Beamforming

  • Cho, Young Seek
  • Received : 2019.07.31
  • Accepted : 2019.09.09
  • Published : 2019.09.30


In this work, a transmitter/receiver front-end module (T/R FEM) with an automatic Tx/Rx switching scheme for a 2.4 GHz microwave power transfer is developed for a retro-reflective beamforming scheme. Recently, research on wireless power transfer techniques has moved to wireless charging systems for mobile devices. Retro-reflective beamforming is a good candidate for tracking the spatial position of a mobile device to be charged. In Tx mode, the T/R FEM generates a minimum of 1 W. It also comprises an amplitude and phase monitoring port for transmitting RF power. In Rx mode, it passes an Rx pilot signal from a mobile device to a digital baseband subsystem to recognize the position of the mobile device. The insertion loss of the Rx signal path is 4.5 dB. The Tx and Rx modes are automatically switched by detecting the Tx input power. This T/R FEM is a design example of T/R FEMs for wireless charging systems based on a retro-reflective beamforming scheme.


Automatic switching;Beamforming;Microwave power transfer;Retro-reflective;Wireless charging


Supported by : Wonkwang University