The Design of Capacitive Coupling Bandpass Filter Using Stepped Impedance Resonator

  • Chien-Hung Chen
  • Hua-Ming Chen
  • Chien-Chen Diao
  • Wei-Kuo Chia
  • Cheng-Fu Yang
Conference paper
Part of the Lecture Notes in Electrical Engineering book series (LNEE, volume 234)


In this chapter, the main focus is on the design of microstrip dual-band filter function. This chapter presents a new compact, low insertion loss, sharp-rejection, and capacitive coupling dual-band microstrip bandpass filter. The operation of filter was designed in dual band of WLAN 2.45 GHz and WiMax 3.5 Hz. In order to reduce the size, the proposed filter used skew symmetric feed and microstrip line ring structure. The proposed filter additional two winding-type L shape of the stepped impedance resonator increased high-frequency transmission zeros to achieve a good dual-band effect. The filter was using electromagnetic simulator Ansoft HFSS, which was used to adjust and optimize the associated parameters. The filter was fabricated by Rogers RT/duroid 6010 substrate and measured by Agilent-N5230A with the connectors. The dual-band bandpass filter experimental results are in good agreement with the full-wave simulation results. Experimental results are in good agreement with the full-wave simulation results.


Microstrip Bandpass filter Stepped impendence 



The authors acknowledge the financial support under grants NSC 99-2221-E-390-013-MY2 and NSC 101-2221-E-244-006.


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Copyright information

© Springer Science+Business Media New York 2013

Authors and Affiliations

  • Chien-Hung Chen
    • 1
  • Hua-Ming Chen
    • 2
  • Chien-Chen Diao
    • 3
  • Wei-Kuo Chia
    • 4
  • Cheng-Fu Yang
    • 5
  1. 1.Department of Avionics EngineeringAir Force AcademyKaohsiungTaiwan, R.O.C.
  2. 2.Institute of Photonics and CommunicationsNational Kaohsiung University of Applied SciencesKaohsiungTaiwan
  3. 3.Department of Electronic EngineeringKao Yuan UniversityKaohsiungTaiwan, R.O.C.
  4. 4.Department of Electronic EngineeringFortune Institute of TechnologyKaohsiungTaiwan, R.O.C.
  5. 5.Department of Chemical and Materials EngineeringNational University of KaohsiungKaohsiungTaiwan, R.O.C.

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