Cascaded Coupled Line Filter With Reconfigurable Bandwidths Using LCP Multilayer Circuit Technology

Alexander Miller, Jia-Sheng Hong

Research output: Contribution to journalArticlepeer-review

35 Citations (Scopus)


This paper presents a new design method for reconfigurable
coupled line filters. The main aim is to develop an analytical
design procedure for designing this type of reconfigurable filter
with any orders and bandwidths. The new design procedure allows
not only making the design easy, but also increasing the passband
performance by eliminating the impedance transformers needed
for matching purposes used in previous filters. A reconfigurable
bandpass filter of this type is designed that can switch between
three distinct bandwidth states ranging from around 26% to 50%
ripple fractional bandwidth (FBW) centered at 2 GHz. In addition,
liquid crystal polymer (LCP) multilayer circuit technology, which
offers a great flexibility in realizing required even- and odd-mode
impedances for a wideband coupled line filter, is deployed to implement
the designed filter. The reconfigurable filter exhibits insertion
losses ranging from 0.57 dB for the widest passband state to 1.95
dB for the narrowest passband state. The fabricated filter shows
good agreement with EM simulated results.
Original languageEnglish
Pages (from-to)1577-1586
Number of pages10
JournalIEEE Transactions on Microwave Theory and Techniques
Issue number6
Publication statusPublished - Jun 2012


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