The variable power divider circuit to use the ring-hybrid coupler

링-하이브리드 커플러를 이용한 가변 전력 분배기 회로

Park, Ung-hee

  • Received : 2015.10.21
  • Accepted : 2015.11.23
  • Published : 2016.02.29


This paper introduces a new variable power divider circuit with an arbitrary power division ratio ranging from $1:{\infty}$ to ${\infty}:1$. The proposed power divider circuit consists of one branch-line coupler to be a good input matching characteristic, two variable phase shifters with 90-degree phase variation to be connected two output paths of the branch-line coupler, and one ring-hybrid coupler to combine output signals of two variable phase shifter. The power division ratio between the two output ports of the proposed power divider can be easily controlled by the phase variation of the two phase shifter. The proposed power divider circuit fabricates on laminated RF-35 (h = 20 mil, er=3.5; Taconic) with a center frequency of 2 GHz. The power division ratio of the fabricated prototype varies from about 1:1000 to 5000000:1, with an input reflection characteristic(S11) of below -20 dB, an insertion loss of about -1.0 dB, and an isolation characteristic of below -17 dB between two output ports in the range 1.9-2.1 GHz.


Power divider;Variable power divider;Unequal power divider;Ring-hybrid coupler


  1. D. M. Pozar, Microwave Engineering, Addison-Wesley Publishing Company, 1990.
  2. E. Wilkinson, "An N-Way Hybrid Power Divider," IRE Trans. on Microwave Theory and Techniques, vol. MTT-8, pp.116-118, Jan.1960.
  3. S. B. Cohn, "A Class of Broadband Three-Port TEM-Mode Hybrids" IEEE Trans. on Microwave Theory and Techniques, vol. MTT-16, no.2, pp.116-118, Feb.1968.
  4. U. H. Park, " Power Divider Using a Coaxial Cable,"Korea Institute of Information and Communication Engineering, vol. 6, no.4, pp. 661-668, April 2012.
  5. U. H. Park, "A variable power divider with 1:3 and 3:1 power division ratios," IEICE ELECTRONICS EXPRESS, vol.9, no.6, pp. 596-601, March 2012.
  6. J. S. Lim, S. M. Oh, J. J. Koo, Y. C. Jeong, and D. Ahn, "An Unequal Power Divider with Adjustable Dividing Ratio," The Journal of Korean Institute of Electromagnetic Engineering and Science, vol.18, no.5, pp.478-485, May 2007.
  7. U. H. Park, "Dual-impedance transmission line employing an ungrounded copper plane," IEICE ELECTRONICS EXPRESS, vol.10, no.12, pp. 1-5, June 2013.
  8. J. Reed and G. J. Wheeler, "A Method of Analysis of Symmetrical Four-Port Networks," IRE Trans. on Microwave Theory and Techniques, vol. MTT-4, pp. 246-252, Oct. 1956.
  9. Y. C. Jeong, J. W. Kim, H. R. Ahn, D. Ahn, and I. S. Chang, "Synthesis of Ring Hybrid Coupler having arbitrary termination impedence," The 1990 symposium of the Korean Institute of Electronics and Information, vol. 13, no. 1, pp.67-70, July. 1990.
  10. U. H. Park, I. S. Chang, J. W. Huh and I. H. Kan, "Design of a RF fixed phase control circuit using I&Q Demodulator," Journal of the Korean Institute of Telematics and Electronics, vol. 36D, pp.8-14, Jan. 1999.


Supported by : Kangwon National University