Journal of electromagnetic engineering and science

The Korean Institute of Electromagnetic Engineering and Science (한국전자파학회)
권호 표지
DOI QR코드

DOI QR Code

A Miniaturized Aperture-Coupled Multilayer Hairpin Bandpass Filter

  • Moon, Han-Ul (Department of Electronic Engineering, Sogang University) ;
  • Choi, Seung-Un (Department of Electronic Engineering, Sogang University) ;
  • Yun, Sang-Won (Department of Electronic Engineering, Sogang University)
  • Published : 2008.03.31
Download PDF
⟨ Previous Next ⟩

Abstract

In this paper, we introduce a coupling, which is achieved through the aperture instead of the conventional edge coupling, so that the bandpass filter is reduced less than half in size compared to conventional planar type. The resulting filter configuration has a near two-fold symmetry, where the aperture coupling is used in the middle of the coupling stages. We designed a bandpass filter using two tapped hairpin resonators, of which the order becomes four. The designed bandpass filter has the size of $8.9{\times}18.3\;mm$. It has the return loss better than 17dB and the insertion loss of less than 5 dB in overall passband. The measured results show good agreements with simulated ones.

Keywords

References

  1. E. G. Cristal, S. Frankel, 'Design of hairpin-line and hybrid hairpin-parallel-coupled-line filters', IEEE MTT -S Dig., pp. 12-13, May 1971
  2. Hun Nam, Hyeonjin Lee, and Yeongseong Lim, 'A design and fabrication of bandpass filter using miniaturized microstrip square SIR', in Electrical and Electronic Technology Conf. Dig., vol. 1, pp. 395-398, Aug. 2001
  3. Jia-Sheng Hong, M. J. Lancaster, 'Theory and experiment of novel microstrip slow-wave open-loop resonator filters', IEEE Trans. on MTT, vol. 45, issue 12, pp. 2358-2365, 1997 https://doi.org/10.1109/22.643844
  4. J. A. Curits, S. J. Fiedziuszko, 'Miniature dual mode microstrip filters', IEEE MTT-S, Digest, pp. 443-446, 1991
  5. I. Wolff, 'Microstrip bandpass filter using degenerate modes of a microstrip ring resonator', Electronics Letters, vol. 8, issue 12, pp. 302-303 Jun. 1972 https://doi.org/10.1049/el:19720223
  6. Ralph Levy, 'Filters with single transmission zeros at real or imaginary frequencies', IEEE Trans. on MTT, vol. 24, issue 4, Apr. 1976
  7. Jia-Sheng Hong, Michael J. Lancaster, 'Design of highly selective microstrip bandpass filters with a single pair of attenuation poles at finite frequencies', IEEE Trans. on MTT, vol. 48, issue 7, Jul. 2000
  8. Chi-Feng Chen, Ting-Yi Huang, Chao-Hsiung Tseng, Ruey-Beei Wu, and Tsung-Wen Chen, 'A miniaturized multilayer quasi-elliptic bandpass filter with aperture-coupled microstrip resonators', IEEE Trans. on MTT, vol. 53, issue 9, Sep. 2005
  9. Jia-Sheng Hong, M. J. Lancaster, 'Aperture-coupled microstrip open-loop resonators and their applications to the design of novel microstrip bandpass filters', IEEE Trans. on MTT, vol. 47, issue 9, Sep. 1999
  10. Jae-Ryong Lee, Jeong-Hoon Cho, and Sang-Won Yun, 'New compact bandpass filter using microstrip λ/4 resonators with open stub inverter', IEEE Microwave and Guided Wave Letters, vol. 10, issue 12l, Dec. 2000
  11. Naftali Herscovici, David M. Pozar, 'Full-wave analysis of aperture-coupled microstrip lines', IEEE Trans. on MTT, vol. 39, issue 7, pp. 1108-1114, 1991 https://doi.org/10.1109/22.85376
  12. Jia-Sheng Hong, Michael J. Lancaster, 'Couplings of microstrip square open-loop resonators for cross-coupled planar microwave filters', IEEE Trans. on MTT, pp. 2099-2109, vol. 44, issue 11, 1996 https://doi.org/10.1109/22.543968