NDLI: Fully dielectric interference-based SPDT with liquid crystal phase shifters

Content Provider	IET Digital Library
Author	Jost, Matthias Reese, Roland Nickel, Matthias Maune, Holger Jakoby, Rolf
Abstract	This study presents the first continuously tuneable, interference-based W-band single-pole double-throw (SPDT), fully implemented in subwavelength (sWL) dielectric fibre topology. Key components are the phase shifters in the two branches of the SPDT, which are realised as line sections filled with liquid crystal. They allow not only to adjust the signal ratios at the two output ports but also to tune the operating frequency between 93 and 110 GHz with isolation >25 dB. The first proof-of-concept SPDT demonstrator is realised and characterised at W-band. However, concept and technology are scalable to higher frequencies. The complete SPDT with the WR10-to-sWL fibre transitions exhibits an insertion loss (IL) at the thru-port between 5 and 7 dB in the frequency range from 85 to 110 GHz, where back-to-back measurements of the transitions itself already indicate an IL of up to 1.6 dB. The measurements at the isolated port of the SPDT exhibit transmission coefficients of less than −25 dB between 93 and 110 GHz with a minimum of −40 dB.
Starting Page	850
Ending Page	857
Page Count	8
ISSN	17518725
Volume Number	12
e-ISSN	17518733
Issue Number	Issue 6, May (2018)
Alternate Webpage(s)	https://digital-library.theiet.org/content/journals/iet-map/12/6
Alternate Webpage(s)	https://digital-library.theiet.org/content/journals/10.1049/iet-map.2017.0695
Journal	IET Microwaves, Antennas & Propagation
Publisher Date	2017-11-24
Access Restriction	Open
Rights Holder	© The Institution of Engineering and Technology
Subject Keyword	Analogue Circuit Back-to-back Measurement Display Materials Fully Dielectric Interference-based SPDT Insertion Loss Interference-based W-band Single-pole Double-throw Line Sections Liquid Crystal Liquid Crystal Phase Shifters Microwave Circuit And Device Millimetre Wave Phase Shifters Proof-of-concept SPDT Demonstrator Signal Ratios Subwavelength Dielectric Fibre Topology SWL Dielectric Fibre Topology Transmission Coefficient WR10-to-sWL Fibre Transitions
Content Type	Text
Resource Type	Article
Subject	Electrical and Electronic Engineering

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