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Bandwidth and Center Frequency Reconfigurable Waveguide Filter Based on Liquid Crystal Technology

Kamrath, Fynn ; Polat, Ersin ; Matic, Stipo ; Schuster, Christian ; Miek, Daniel ; Tesmer, Henning ; Boe, Patrick ; Wang, Dongwei ; Jakoby, Rolf ; Maune, Holger ; Höft, Michael (2021):
Bandwidth and Center Frequency Reconfigurable Waveguide Filter Based on Liquid Crystal Technology.
In: IEEE Journal of Microwaves, (Early Access), pp. 1-11. e-ISSN 2692-8388,
DOI: 10.1109/JMW.2021.3115244,
[Article]

Abstract

This paper presents for the first time a fully electronically reconfigurable waveguide filter tunable in bandwidth and center frequency based on liquid crystal (LC) technology. A continuously reconfigurable two pole bandpass filter is designed and characterized in the Ka-band at 30 \,\mathrmGHz. To be able to tune both center frequency and bandwidth independently, the resonators and coupling structures are filled with LC as tunable material. Hence, the filter’s center frequency and coupling strengths can be tuned and, furthermore, tuning with constant filter characteristic is possible. To tune the LC, a novel two-layer electrode design for waveguide structures is presented, which is simple to integrate and provides a high tuning efficiency with low insertion loss. By applying different bias configurations, the LC’s effective permittivity can be varied, and therefore, also the resonators’ electrical lengths. The presented two pole filter can adapt its center frequency from 29.8 \,\mathrmGHz\,\rm to\, 30.7 \,\mathrmGH with a maximum 3 \,\rm d bandwidth variation from 660 \,\mathrmMHz\,\rm to\, 870 \,\mathrmMH. The measurements are carried out with bias voltages up to ±250 \,\mathrmV.

Item Type: Article
Erschienen: 2021
Creators: Kamrath, Fynn ; Polat, Ersin ; Matic, Stipo ; Schuster, Christian ; Miek, Daniel ; Tesmer, Henning ; Boe, Patrick ; Wang, Dongwei ; Jakoby, Rolf ; Maune, Holger ; Höft, Michael
Title: Bandwidth and Center Frequency Reconfigurable Waveguide Filter Based on Liquid Crystal Technology
Language: English
Abstract:

This paper presents for the first time a fully electronically reconfigurable waveguide filter tunable in bandwidth and center frequency based on liquid crystal (LC) technology. A continuously reconfigurable two pole bandpass filter is designed and characterized in the Ka-band at 30 \,\mathrmGHz. To be able to tune both center frequency and bandwidth independently, the resonators and coupling structures are filled with LC as tunable material. Hence, the filter’s center frequency and coupling strengths can be tuned and, furthermore, tuning with constant filter characteristic is possible. To tune the LC, a novel two-layer electrode design for waveguide structures is presented, which is simple to integrate and provides a high tuning efficiency with low insertion loss. By applying different bias configurations, the LC’s effective permittivity can be varied, and therefore, also the resonators’ electrical lengths. The presented two pole filter can adapt its center frequency from 29.8 \,\mathrmGHz\,\rm to\, 30.7 \,\mathrmGH with a maximum 3 \,\rm d bandwidth variation from 660 \,\mathrmMHz\,\rm to\, 870 \,\mathrmMH. The measurements are carried out with bias voltages up to ±250 \,\mathrmV.

Journal or Publication Title: IEEE Journal of Microwaves
Number: Early Access
Uncontrolled Keywords: Couplings;Resonators;Resonant frequency;Tuning;Bandwidth;Inverters;Permittivity;Microwave filter;liquid crystals;millimeter wave communication;tunable circuits and devices;K-band
Divisions: 18 Department of Electrical Engineering and Information Technology
18 Department of Electrical Engineering and Information Technology > Institute for Microwave Engineering and Photonics (IMP) > Microwave Engineering
18 Department of Electrical Engineering and Information Technology > Institute for Microwave Engineering and Photonics (IMP)
Date Deposited: 11 Nov 2021 07:06
DOI: 10.1109/JMW.2021.3115244
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