Research Article Open Access

Microstrip Bandpass Filter with Wide Stopband and High Out-of-Band Rejection

Mohamad Farhat1, Bal Virdee2 and Nader H. Ghareeb1
  • 1 Australian College of Kuwait, Kuwait
  • 2 London Metropolitan University, United Kingdom
American Journal of Engineering and Applied Sciences
Volume 12 No. 4, 2019, 543-548

DOI: https://doi.org/10.3844/ajeassp.2019.543.548

Submitted On: 17 November 2019 Published On: 28 December 2019

How to Cite: Farhat, M., Virdee, B. & Ghareeb, N. H. (2019). Microstrip Bandpass Filter with Wide Stopband and High Out-of-Band Rejection. American Journal of Engineering and Applied Sciences, 12(4), 543-548. https://doi.org/10.3844/ajeassp.2019.543.548

Abstract

This paper presents a compact microstrip bandpass filter exhibiting a wide stopband, high selectivity and easily tunable passband. The filter comprises of asymmetric resonator structures, which are interconnected by an inter-digital capacitor to enable the realization of a wide bandwidth with high rejection level. High selectivity and easily tunable passband are obtained by optimizing the parameters of the interdigital capacitor. The filter has high out-of-band rejection 30 dB, less than 0.6 dB of insertion-loss, up to 5.5 GHz spurii free and more than 15 dB of return-loss. Full-wave electromagnetic simulator ADSTM based on Method of Moment technology is used to analyze and optimize the prototype bandpass filter. The proposed technique was verified practically to validate the design methodology. The experimental results of the prototype circuit are presented and a good agreement was obtained comparing with the simulation results. The dimensions of the proposed filter are 32×24 mm2. The filter’s characteristics and compact size make it suitable for wireless communication systems. 

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Keywords

  • Asymmetric Resonator
  • Bandpass Filter
  • Microstrip
  • Spurious Suppression
  • Ultra-Wide Stopband