Miniature Quasi-Lumped-Element Wideband Bandpass Filter at 0.5–2-GHz Band Using Multilayer Liquid Crystal Polymer Technology

Jia-Sheng Hong, Shilong Qian

Research output: Contribution to journalArticlepeer-review

26 Citations (Scopus)
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Abstract

Miniature wideband bandpass filters are proposed using multilayer liquid crystal polymer (LCP) technology to cover
the very low-frequency band of 0.5–2 GHz. To reduce the filter
size at such low frequencies, lumped-element theory is used for the filter design and a value extraction process is developed to accurately get the capacitive or inductive values of different multilayer microstrip quasi-lumped elements. These elements are used to produce the required filter response, and thus the overall design process relies less on the time-consuming EM optimization. A filter with the size is demonstrated as an initial design. To further improve the stopband performance, an improved design is then developed while still maintaining the
compact sizes within . Both filters are fabricated on a five-metal layer LCP construction, which has not been done before, with robust via connections using the newly developed laser-aided fabrication technique. Good agreements between simulation and fabrication are observed, which has proven both the success of the design methodology, as well as the fabrication technique.
Original languageEnglish
Pages (from-to)2799-2807
Number of pages9
JournalIEEE Transactions on Microwave Theory and Techniques
Volume60
Issue number9
DOIs
Publication statusPublished - Sep 2012

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