Designing and Simulation of a Compact Balanced Bandpass Filter Based on a Substrate Integrated Waveguide Structure with High Common Mode Rejection

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Authors

1 Khatam al-Anbia University of Air Defense, Tehran, Iran

2 student at Islamic Azad University, Research Sciences Departmen

3 Associate Professor of Khatam Al Anbia Air Defense University (PBUH

Abstract

The objective of this paper is to present a balanced bandpass filter whose physical dimensions are reduced using a quarter mode substrate integrated waveguide (QM-SIW) and an eighth mode (EM-SIW) resonators. The step-by-step design process of a balanced filter with the desired specifications is presented and then the balanced filter is realized with six degree Chebyshev response by choosing the right tapping feed points and combining the quarter and eighth mode resonators. In addition to achieving the desired differential filter response, the rejection rate of common mode is above 60dB in the desired frequency band with the FBW of 15% and the central frequency of 3.1GHz. Also, the dimensions of the resonators used in the mentioned design are about one quarter and one eighth of a common rectangular one, which is much smaller than the other developed counterparts. By using three-cell PBG resonators, the bandwidth limitation of the common mode rejection is relaxed such that the common mode rejection is above 35dB outside the pass band and is above 80dB inside the pass band. The proposed design has been fabricated and the results have shown good agreement when compared with the simulation results.

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References

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History

  • Receive Date: 17 October 2021
  • Revise Date: 23 August 2022
  • Accept Date: 17 June 2022

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