TU Darmstadt / ULB / TUprints

Fast and Miniaturized Phase Shifter With Excellent Figure of Merit Based on Liquid Crystal and Nanowire-Filled Membrane Technologies

Wang, Dongwei ; Polat, Ersin ; Schuster, Christian ; Tesmer, Henning ; Rehder, Gustavo P. ; Serrano, Ariana Lacorte Caniato ; Gomes, Leonardo Amorese Gallo ; Ferrari, Philippe ; Maune, Holger ; Jakoby, Rolf (2022):
Fast and Miniaturized Phase Shifter With Excellent Figure of Merit Based on Liquid Crystal and Nanowire-Filled Membrane Technologies. (Publisher's Version)
In: IEEE Journal of Microwaves, 2 (1), pp. 174-184. IEEE, e-ISSN 2692-8388,
DOI: 10.26083/tuprints-00021212,
[Article]

[img] Text
Fast_and_Miniaturized_Phase_Shifter_With_Excellent_Figure_of_Merit_Based_on_Liquid_Crystal_and_Nanowire-Filled_Membrane_Technologies.pdf
Available under: CC BY 4.0 International - Creative Commons, Attribution.

Download (3MB)
Item Type: Article
Origin: Secondary publication via sponsored Golden Open Access
Status: Publisher's Version
Title: Fast and Miniaturized Phase Shifter With Excellent Figure of Merit Based on Liquid Crystal and Nanowire-Filled Membrane Technologies
Language: English
Abstract:

This paper presents a highly miniaturized tuneable microstrip line phase shifter for 5 GHz to 67 GHz. The design takes advantage of the microstrip topology by substituting the ground plane by a metallic-nanowire-filled porous alumina membrane (NaM). This leads to a slow-wave (SW) effect of the transmission line; thus, the transmission line can be physically compact while maintaining its electric length. By applying a liquid crystal (LC) with its anisotropic permittivity as substrate between the transmission line and the NaM, a tuneable microstrip line phase shifter is realized. Three demonstrators are identically fabricated filled with different types of high-performance microwave LCs from three generations (GT3-23001, GT5-26001 and GT7-29001). The measurement results show good matching in a 50 Ω system with reflection less than −10 dB over a wide frequency range. These demonstrators are able to reach a maximum figure of merit (FoM) of 41 °/dB, 48 °/dB, and 70 °/dB for different LCs (GT3-23001, GT5-26001 and GT7-29001, respectively). In addition, experiments show that all three LCs should be biased with square wave voltage at approximately 1 kHz to achieve maximum tuneability and response speed. The achieved response times with GT3-23001, GT5-26001 and GT7-29001 are 116 ms, 613 ms, and 125 ms, respectively, which are much faster than other reported LC phase shifter implementations. Large-signal analysis shows that these implementations have high linearity with third-order interception (IP3) points of approximately 60 dBm and a power handling capability of 25 dBm.

Journal or Publication Title: IEEE Journal of Microwaves
Volume of the journal: 2
Issue Number: 1
Place of Publication: Darmstadt
Publisher: IEEE
Classification DDC: 500 Naturwissenschaften und Mathematik > 530 Physik
600 Technik, Medizin, angewandte Wissenschaften > 600 Technik
Divisions: 18 Department of Electrical Engineering and Information Technology > Institute for Microwave Engineering and Photonics (IMP)
Date Deposited: 02 May 2022 11:13
Last Modified: 23 Aug 2022 08:23
DOI: 10.26083/tuprints-00021212
Corresponding Links:
URN: urn:nbn:de:tuda-tuprints-212122
Additional Information:

Index terms: IP3, liquid crystal, microstrip line, nanowires, phase shifter, slow-wave, S-parameter

URI: https://tuprints.ulb.tu-darmstadt.de/id/eprint/21212
PPN: 494205237
Export:
Actions (login required)
View Item View Item