Tunable Liquid Crystal Filter in Nonradiative Dielectric Waveguide Technology at 60 GHz

This letter presents a continuously tunable nonradiative dielectric waveguide three-pole bandpass filter based on liquid crystal (LC) technology at 60 GHz. LC is used as tunable material to obtain a continuous tunable center frequency. For the LC's orientation, an electrode network with parasit...

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Bibliographic Details
Published inIEEE microwave and wireless components letters Vol. 29; no. 1; pp. 44 - 46
Main Authors Polat, Ersin, Reese, Roland, Jost, Matthias, Schuster, Christian, Nickel, Matthias, Jakoby, Rolf, Maune, Holger
Format Journal Article
LanguageEnglish
Published IEEE 01.01.2019
Subjects
Band-pass filters
Couplings
Dielectrics
Electrodes
Filter
Junctions
liquid crystal (LC)
Microwave filters
millimeter wave
nonradiative dielectric (NRD) waveguide
Radio frequency
tunable circuits and devices
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Summary:This letter presents a continuously tunable nonradiative dielectric waveguide three-pole bandpass filter based on liquid crystal (LC) technology at 60 GHz. LC is used as tunable material to obtain a continuous tunable center frequency. For the LC's orientation, an electrode network with parasitic mode suppressive structure is realized. The measurements are performed with magnetic and electric biasing to verify the performance of the filter design. A maximum fractional bandwidth of 1% and a tunability of 2.5% were measured with electrical biasing. Furthermore, the filter's insertion loss is between 4.9 and 6.2 dB over the tuning range. The extracted unloaded quality factor for electrical biasing ranges from 96 to 141.
ISSN:1531-1309
1558-1764
DOI:10.1109/LMWC.2018.2884152