A Compact 275-320-GHz Reflection-Type Phase Shifter

Eunjung Kim, Sanggeun Jeon

Research output: Contribution to journalArticlepeer-review

3 Citations (Scopus)


This letter presents a WR-3.4-band reflection-type phase shifter (RTPS) in a 250-nm InP double heterojunction bipolar transistor (DHBT) technology. A reflective load with an L-section network is implemented using a diode-connected transistor, a transmission line, and a shunt capacitor. The reference impedance of the reflective load is set to a low impedance of 30 Ω , thus leading to a low-loss variation over a wide operating bandwidth. To minimize the chip area, a quadrature hybrid for combining reflected signals is implemented using a compact broadside coupled-line coupler. The measurement shows that the RTPS provides a continuous 180° phase shift with an average insertion loss of 9.9-10.9 dB over a frequency range from 275 to 320 GHz. The loss variation is only 1 dB. The root-mean-squared (RMS) amplitude and phase errors maintain below 2.9 dB and 7.3°, respectively. The chip size including all probing pads is as small as 0.37 x 0.46 mm², and the core size is only 0.02 mm². The dc power consumption is zero.

Original languageEnglish
JournalIEEE Microwave and Wireless Components Letters
Publication statusAccepted/In press - 2022

Bibliographical note

Publisher Copyright:


  • Bandwidth
  • Couplers
  • Impedance
  • InP double heterojunction bipolar transistor (DHBT)
  • Phase shifters
  • phased array
  • reflection-type phase shifter (RTPS)
  • Semiconductor device measurement
  • subterahertz
  • Transmission line measurements
  • Wireless communication
  • WR-3.4 band.

ASJC Scopus subject areas

  • Condensed Matter Physics
  • Electrical and Electronic Engineering


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