A Study on the Design of Microwave Oscillator Output Matching Circuit Using 3-dB Coupler Tuner

3-dB Coupler Tuner를 이용한 초고주파 발진기의 출력 정합회로 설계에 관한 연구

  • 이석기 ;
  • 오재석 ;
  • 이영순 ;
  • 김병철
  • Published : 1998.04.01

Abstract

Generally, the output matching circuit has the most influence to the output power of oscillator and existing method for output matching has difficulty for making the optimum output matching circuit because the matching has to be done nearby the infinite impedance area of the Smith Chart. In this paper, it is studied for the output matching circuit of the microwave oscillator to get the maximum output power. The maximum output point can be found by adjusting the position of moving short in the Tuner while the oscillator is operating after connect the 3-dB coupler Tuner to the oscillator without output matching circuit. To design the oscillator for the maximum output power can be done easily with the microstrip line which is realized from the measured S-parameters of Tuner. In compare the oscillator by the existing method with another one by the suggested method in this paper, the first one has 6.45 dBm output power and second one has 9.71 dBm which is 3.26 dBm higher than the first one at the oscillation frequency 1.0338 GHz.

Keywords

References

  1. IEEE MTT v.MTT-31 An Analytic Approach to Optimum Oscillator Design Using S-Parameters Rowan J. Gilmore;Fred J. Rosenbaum
  2. IRE MTT-4 no.2 Coupled Strip Transmission Line Filters and Directional Couplers E. M. T. Jones;J. T. Bolljahn
  3. IEEE MTT v.MTT-34 A GaAs MESFET Self-Bias Mode Oscillator Hiroyuki Abe
  4. IEEE MTT v.MTT-23 Design and Performance of X-band Oscillators with GaAs Schottcy-gate field-effect transistors M. Meada;K. Kimura;H. Kodera
  5. Lines, Waves, and Antennas Brown;Sharpe;Hughes;Post
  6. Trans. IRE The Transmission Line Properties of a Rounded Wire between Parallel Planes Wheeler H. A.
  7. 대한전자공학회 논문집 v.30 no.A-10 3-dB Coupler Tuner를 이용한 UHF Power Amp의 설계 김병철
  8. Proc. IRE Characteristic Impedance of a Slab Line Mathapatra, S.
  9. Microwave Transistor Amplifiers Analysis And Design Guileromo Gonzalez
  10. Microwave Engineering D. M. Pozar
  11. Editors Dielectric Resonators Darko Kajfez;Pierre Guillon
  12. Microwave Systems News v.13 YIG-Tuned Oscillator Fundamentals N. K. Osbrink