Design for Minimizing Transmission Loss of Broadband Right-Angle Coaxial-to-Microstrip Transition

광대역 동축-마이크로스트립 수직 트랜지션의 전송 손실 저감 설계

  • Kim, Sei-Yoon (School of Electrical and Computer Engineering, Chungbuk National University) ;
  • Roh, Jin-Eep (School of Electrical and Computer Engineering, Chungbuk National University) ;
  • Chung, Ji-Young (School of Electrical and Computer Engineering, Chungbuk National University) ;
  • Ahn, Bierng-Chearl (School of Electrical and Computer Engineering, Chungbuk National University) ;
  • You, Young-Gap (School of Electrical and Computer Engineering, Chungbuk National University)
  • Published : 2006.11.30

Abstract

A design method for minimizing transmission loss of a broadband right-angle transition from a coaxial cable to a microstrip line is presented. The right-angle transition has been widely used where printed circuit applications need to be fed from behind the ground plane using coaxial line. To obtain the minimized transmission loss over the whole operating frequency range of the transition, design parameters such as ground aperture and probe diameters, ground aperture offset, and stub length are optimized using a commercial electromagnetic simulation software. Results are presented for the optimum right-angle transition from an SMA connector to a microstrip line on common reinforced 0.787 mm thick PTFE substrates. Measurements of a fabricated transition show that reflection coefficient is less than -22 dB and insertion loss is less than 0.45 dB over $0.05{\sim}20GHz$.

Keywords

Right-Angle Coaxial-To-Microstrip Transition;Discontinuity Compensation;Broadband Transition

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