Novel Hybrid Electric/Magnetic Bias Concept for Tunable Liquid Crystal Based Filter

This paper presents a novel hybrid bias concept for liquid crystal (LC) filter by using simultaneously electric and magnetic bias fields. It enables continuous tuning with a simplified electrode design, decreased number of electrodes and reduced bias voltage. Furthermore, the tuning efficiency is in...

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Bibliographic Details
Published in:IEEE journal of microwaves 2022-07, Vol.2 (3), p.1-6
Main Authors: Polat, Ersin, Kamrath, Fynn, Matic, Stipo, Tesmer, Henning, Jimenez-Saez, Alejandro, Wang, Dongwei, Maune, Holger, Hoft, Michael, Jakoby, Rolf
Format: Article
Language:English
Subjects:
Couplings
Electrodes
K-band
Liquid crystals
microwave filter
millimeter wave communication
Permittivity
Perpendicular magnetic anisotropy
Pins
tunable circuits and devices
Tuning
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Summary:This paper presents a novel hybrid bias concept for liquid crystal (LC) filter by using simultaneously electric and magnetic bias fields. It enables continuous tuning with a simplified electrode design, decreased number of electrodes and reduced bias voltage. Furthermore, the tuning efficiency is increased, since the homogeneous bias fields enable a full exploitation of the LC's anisotropy. To demonstrate this concept, a novel reconfigurable gap waveguide two-pole bandpass filter with tunable center frequency and coupling elements is designed at 30 \,\mathrm{GHz}. Liquid crystal technology is applied as tunable material, whereby tunability of the center frequency and coupling elements is obtained by controlling the LC's effective permittivity. The presented filter's center frequency can be tuned from 28.88 \,\mathrm{GHz}\,\mathrm{to}\, 29.88 \,\mathrm{GHz} with a maximum bias voltage of 100 V, with a return loss of 20 dB and low insertion loss of only 1.65 to 1.95 dB.
ISSN:2692-8388
2692-8388
DOI:10.1109/JMW.2022.3180227