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Reconfigurable Millimeter-Wave Components Based on Liquid Crystal Technology for Smart Applications

Polat, Ersin and Tesmer, Henning and Reese, Roland and Nickel, Matthias and Wang, Dongwei and Schumacher, Peter and Jakoby, Rolf and Maune, Holger (2020):
Reconfigurable Millimeter-Wave Components Based on Liquid Crystal Technology for Smart Applications.
In: Crystals, 10 (5), ISSN 2073-4352,
DOI: 10.3390/cryst10050346,
[Online-Edition: https://www.mdpi.com/2073-4352/10/5/346],
[Article]

Abstract

This paper presents recent development of tunable microwave liquid crystal (LC) components in the lower millimeter wave (mmW) regime up to the W-band. With the utilization of increasing frequency, conventional metallic waveguide structures prove to be impractical for LC-based components. In particular, the integration of the electric bias network is extremely challenging. Therefore, dielectric waveguides are a promising alternative to conventional waveguides, since electrodes can be easily integrated in the open structure of dielectric waveguides. The numerous subcategories of dielectric waveguides offer a high degree of freedom in designing smart millimeter wave components such as tunable phase shifters, filters and steerable antennas. Recent research resulted in many different realizations, which are analyzed in this paper. The first demonstrators of phased array antennas with integrated LC-based phase shifters are reviewed and compared. In addition, beam steering with a single antenna type is shown. Furthermore, the possibility to realize tunable filters using LC-filled dielectric waveguides is demonstrated.

Item Type: Article
Erschienen: 2020
Creators: Polat, Ersin and Tesmer, Henning and Reese, Roland and Nickel, Matthias and Wang, Dongwei and Schumacher, Peter and Jakoby, Rolf and Maune, Holger
Title: Reconfigurable Millimeter-Wave Components Based on Liquid Crystal Technology for Smart Applications
Language: English
Abstract:

This paper presents recent development of tunable microwave liquid crystal (LC) components in the lower millimeter wave (mmW) regime up to the W-band. With the utilization of increasing frequency, conventional metallic waveguide structures prove to be impractical for LC-based components. In particular, the integration of the electric bias network is extremely challenging. Therefore, dielectric waveguides are a promising alternative to conventional waveguides, since electrodes can be easily integrated in the open structure of dielectric waveguides. The numerous subcategories of dielectric waveguides offer a high degree of freedom in designing smart millimeter wave components such as tunable phase shifters, filters and steerable antennas. Recent research resulted in many different realizations, which are analyzed in this paper. The first demonstrators of phased array antennas with integrated LC-based phase shifters are reviewed and compared. In addition, beam steering with a single antenna type is shown. Furthermore, the possibility to realize tunable filters using LC-filled dielectric waveguides is demonstrated.

Journal or Publication Title: Crystals
Volume: 10
Number: 5
Divisions: 18 Department of Electrical Engineering and Information Technology
18 Department of Electrical Engineering and Information Technology > Institute for Microwave Engineering and Photonics > Microwave Engineering
18 Department of Electrical Engineering and Information Technology > Institute for Microwave Engineering and Photonics
Date Deposited: 07 May 2020 07:40
DOI: 10.3390/cryst10050346
Official URL: https://www.mdpi.com/2073-4352/10/5/346
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