A dual-mode dual-band filter constructed on gaas substrate for unlicensed 60- and 77-GHz applications

C. L. Yang*, S. Y. Shu, M. C. Chiang, H. C. Chiu, Y. C. Chiang

*Corresponding author for this work

Research output: Contribution to journalJournal Article peer-review

6 Scopus citations

Abstract

A novel dual-mode dual-band bandpass filter (BPF), which is fabricated with a 0.5-μm pHEMT MMIC technology is presented. A design method that can precisely determine optimal elements' values of a wide-band dual-mode filter based on desired passband specifications is developed. This filter is constructed using two stacked ring resonators with individual perturbations and feeding capacitors, so both fractional bandwidths and center frequencies of the dual-band filter can be flexibly controlled. Benefiting from the multilayer capability of the advanced process, the feeding structure connecting the two stacked ring resonators can be easily implemented using a compact metal-insulator-metal (MIM) structure rather than a large-sized coupling scheme. The size of the filter is only 0.47×0.8 mm2, and the measured insertion losses in lower and upper pasbands are less than 2.4 dB and 3.0 dB, respectively. The associated return losses in the passbands are all greater than 15 dB.

Original languageEnglish
Pages (from-to)2431-2444
Number of pages14
JournalJournal of Electromagnetic Waves and Applications
Volume24
Issue number17-18
DOIs
StatePublished - 01 12 2010

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