volume | PIER Journals

2010-06-25

A Miniaturized Open-Loop Resonator Filter Constructed with Floating Plate Overlays

Chih-Yin Hsiao,

Dr. Chih-Yin Hsiao

National Tsing Hua University

Taiwan

Homepage

Yi-Chyun Chiang

Prof. Yi-Chyun Chiang

Chang Gung University

Taiwan

Homepage

Progress In Electromagnetics Research C, Vol. 14, 131-145, 2010

doi:10.2528/PIERC10051405

Abstract

This work presents a new technique that uses floating plate overlays to realize the open-loop resonator bandpass filter with characteristics of compact size and having four controllable transmission zeros to achieve the multispurious suppression. Three floating plate overlays are used to cover parts of the open-loop resonator filter to increase the coupling between resonators and move the transmission zeros to desired frequencies to enhance harmonic suppression. A design procedure that developed based on an equivalent circuit model of such a new type of filter is proposed. Two experimental prototypes are designed and fabricated to verify the proposed design method. The measured results agree well with the simulations. The measured insertion losses of the prototypes in passband are all less than 2 dB. One prototype is designed to suppress third, fourth, and fifth harmonics with the suppression greater than 30 dBc. Another prototype can suppress second, third, and fourth order harmonics below 20 dBc. In addition, prototype circuit areas are only about 50 percent of the conventional open-loop filter.

Citation

Copy Export

Chih-Yin Hsiao, and Yi-Chyun Chiang, "A Miniaturized Open-Loop Resonator Filter Constructed with Floating Plate Overlays," Progress In Electromagnetics Research C, Vol. 14, 131-145, 2010.
doi:10.2528/PIERC10051405

References

1. Hong, J. S. and M. J. Lancaster, "Canonical microstrip filter using square open-loop resonators," IEE Electron. Let., Vol. 31, No. 23, 2020-2022, Nov., 1995.
doi:10.1049/el:19951370

2. Tsai, C. M., S. Y. Lee, and C. C. Tsai, "Performance of a planar filter using a 0゜ feed structure," IEEE Microwave Theory and Techniques, Vol. 50, No. 10, 2362-2367, Oct., 2002.
doi:10.1109/TMTT.2002.803421

3. Gu, J. Z., F. Zhang, C. Wang, Z. Zhang, M. Qi, and X. W. Sun, "Miniaturization and harmonic suppression open-loop resonator bandpass filter with capacitive terminations," IEEE Microwave Symposium Digest, 373-376, Jun., 2006.

4. Hong, J. S., "Dual-mode microstrip open-loop resonator and filters," IEEE Microwave Theory and Techniques, Vol. 55, No. 8, 1764-1770, Aug., 2007.
doi:10.1109/TMTT.2007.901592

5. Chin, K. S. and D. J. Chen, "Novel microstrip bandpass filters using direct-coupled triangular stepped-impedance resonators for spurious suppression," Progress In Electromagnetics Research Letters, Vol. 12, 11-20, 2009.
doi:10.2528/PIERL09090602

6. Chin, K. S. and C. K. Lung, "Miniaturized microstrip dual-band bandstop filters using tri-section stepped-impedance resonators," Progress In Electromagnetics Research C, Vol. 10, 37-48, 2009.
doi:10.2528/PIERC09080306

7. Chin, K. S., Y. C. Chiang, and J. T. Kuo, "Microstrip open-loop resonator with multispurious suppression," IEEE Microwave and Wireless Components Letters, Vol. 17, No. 8, 574-576, Aug., 2007.
doi:10.1109/LMWC.2007.901763

8. Chiang, Y. C. and C. H. Hsieh, "Wideband microwave filter constructed by asymmetrical compact microstrip resonator and floating plate coupling structure," IET Electronics Letters, Vol. 43, No. 14, 762-763, Jul., 2007.

9. Pozar, D. M., Microwave Engineering, 3rd Ed., John Wiley & Sons, 2005.

10. Chen, C. F., T. Y. Huang, and R. B. Wu, "A miniaturized net-type microstrip bandpass filter using λ/8 resonators," IEEE Microwave and Wireless Components Letters, Vol. 15, No. 7, 481-483, Jul., 2005.
doi:10.1109/LMWC.2005.851577