Reflection-Type 5-bit Digital Phase Shifter with Constant Insertion Loss

균일 삽입 손실 특성을 갖는 반사형의 5-비트 디지털 위상 변위기

  • 고경석 (충북대학교 전파공학과) ;
  • 최익권 (충북대학교 전기전자 및 컴퓨터공학부)
  • Published : 2002.07.01


This paper presents 12.2 GHz ~ 12.7 GHz frequency band reflection type 5-bit digital phase shifter with constant insertion loss property that was fabricated with relatively low cost's InGaAs HEMT for amplifier. The unavoidable large insertion loss difference between on and off states of HEMT, when it is designed by conventional design theory based on ideal switching device, is removed by transforming the HEMT impedances at on and off states to other proper values connecting a certain length transmission line to HEMT and then applying the conventional design theory. The fabricated 5-bit digital phase shifter shows very good insertion loss properties of less than 1.5 dB insertion loss difference and -4.5 dB ~ -6 dB insertion loss in 35 phase steps at 12.2 GHz ~ 12.7 GHz. These results verify the design method presented in this paper, which is useful to design phase shifter of constant insertion loss with non-ideal switching device.


  1. IEEE Trans. Microwave Theory Tech. v.MTT-28 Design of Loaded-Line p-i-n Diode Phase Shifter Circuits I. J. Bahl;K. C. Gupta
  2. Electron Lett. v.16 Dual-Gate MESFET Phase Shifter with Gain at 12 GHz C. Tsironis;P. Harrop
  3. IEEE Monolithic Microwave and Millimeter Wave Circuit Symp. Digest Wideband S-C Band Monolithic Phase Shifter Y. Ayasli(et al.)
  4. Microwave And Millimeter Wave Phase Shifters S. K. Koul;B. Bhat
  5. Microwave Solid State Circuit Design I. B. Bahl;P. Bhartia
  6. GoAs MESFET Circuit Design R. Soares
  7. Microwave J. Microwave switching with GaAs FETs Y. Ayasli
  8. IEEE Trans. Microwave Theory Tech. v.MTT-33 no.12 C-band 6-bit GaAs monolithic phase shifter C. Andricos;I. J. Bahl;E. L. Griffin
  9. Electron Lett. v.17 no.3 Accurate model for open and effect of microstrip lines M. Kirschning;R. Jansen;N. Koster
  10. IEEE Trans. Microwave Theory Tech. v.MTT-22 no.5 Design equations and bandwidth of loaded-line phase shifters W. A. Davis