Journal of electromagnetic engineering and science

The Korean Institute of Electromagnetic Engineering and Science (한국전자파학회)
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High Selectivity Coupled Line Impedance Transformer with Second Harmonic Suppression

  • Kim, Phirun (Division of Electronics and Information Engineering, IT Convergence Research Center, Chonbuk National University) ;
  • Park, Junsik (Division of Electronics and Information Engineering, IT Convergence Research Center, Chonbuk National University) ;
  • Jeong, Junhyung (Division of Electronics and Information Engineering, IT Convergence Research Center, Chonbuk National University) ;
  • Jeong, Seungho (Division of Electronics and Information Engineering, IT Convergence Research Center, Chonbuk National University) ;
  • Chaudhary, Girdhari (Division of Electronics and Information Engineering, IT Convergence Research Center, Chonbuk National University) ;
  • Jeong, Yongchae (Division of Electronics and Information Engineering, IT Convergence Research Center, Chonbuk National University)
  • Received : 2015.06.22
  • Accepted : 2015.11.24
  • Published : 2016.01.31
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Abstract

This paper presents a design of an impedance transformer (IT) with high frequency selectivity characteristics. The frequency selectivity can be controlled by even- and odd-mode impedance of a shunt coupled transmission line (TL). For experimental validation, a 50- to $20-{\Omega}$ IT was implemented at a center frequency ($f_0$) of 2.6 GHz for the long-term evolution signal. The measured results were in good agreement with the simulations, showing a return loss higher than 19 dB over a passband bandwidth of 0.63 GHz (2.28-2.91 GHz) and good sharp frequency selectivity characteristic near to the passband. The series coupled TL provides a transmission zero at 5.75 GHz, whereas the shunt coupled TL provides three transmission zeros located at 2 GHz, 3.1 GHz, and 7.14 GHz.

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References

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