Tunable dielectric delay line phase shifter based on liquid crystal technology for a SPDT in a radiometer calibration scheme at 100 GHz

Jost, Matthias; Reese, Roland; Weickhmann, C.; Schuster, Christian; Karabey, Onur Hamza; Maune, Holger; Jakoby, Rolf

doi:10.1109/mwsym.2016.7540007

Cited by 14 publications

(15 citation statements)

References 7 publications

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“…The FoM reaches values between 60 and 66 ∘ /dB for magnetic and 55 and 62 ∘ /dB for electrical biasing above 100 GHz. Therefore, the performance has been increased by 50% compared to the preliminary design in [11], which is mainly due to the new WR10-to-sWL fibre transition design, which is still included in these measurement results. Measurements of a reference line, which is the same waveguide just without the LC section, resulted in transmission coefficients around −1.2 dB at 100 GHz (see Fig.…”

Section: Lc-based Tuneable Phase Shiftermentioning

confidence: 99%

“…Due to this maximum difference in permittivity, the field is confined better and the evanescent fields are nearly facing no dielectric loss. Compared to [9,11], the fibre has a cross-section of 1.8 mm × 1.8 mm. The fundamental E 11 y mode is a hybrid, rotationally symmetrical mode (see Fig.…”

Section: Dielectric Waveguide Componentsmentioning

confidence: 99%

“…The first investigations have been focused on the WR10-to-sWL fibre transition. In [9,11], the transitions ended abruptly on the fibre side, causing increased radiation, due to the bending of the Efield around the corners (see Fig. 2 top).…”

Section: Wr10-to-swl Fibre Transitionmentioning

confidence: 99%

“…For the application in an interference-based SPDT, a differential phase shift of 90 ∘ is mandatory. In this work, the phase shifter from [11] has been modified according to the points mentioned before. This means the taper section has been adapted to the new metallic transitions and the triangular dielectric tapering.…”

Section: Lc-based Tuneable Phase Shiftermentioning

confidence: 99%

“…To assess the feasibility of the continuously tuneable SPDT, tuneable dielectric line phase shifters based on LC technology have already been pre-investigated and published in [11]. However, its performance was significantly below our expectations.…”

Section: Introductionmentioning

confidence: 99%

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Fully dielectric interference‐based SPDT with liquid crystal phase shifters

Jost

Reese

Nickel

et al. 2018

IET Microwaves, Antennas & Propagation

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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.

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Section: Lc-based Tuneable Phase Shiftermentioning

confidence: 99%

Section: Dielectric Waveguide Componentsmentioning

confidence: 99%

Section: Wr10-to-swl Fibre Transitionmentioning

confidence: 99%

Section: Lc-based Tuneable Phase Shiftermentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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