@inbook{ac4664cbbec045dda0acf824d7fb9066,
title = "Widely-Reconfigurable 2.5:1 Coaxial-Cavity Resonators Using Actuated Liquid-Metal Posts",
abstract = "This paper reports on a new method for tuning the resonant frequency of coaxial cavity resonators beyond one octave (2.5:1). The proposed tuning mechanism is based on pneumatically-actuated liquid metals (LMs) that functionalize a variable-height post - inner conductor - of a coaxial cavity resonator. The employed LM is an eutectic alloy of Gallium, Indium and Tin - commonly known as Galinstan - that is filled inside a Teflon-based tube. It is demonstrated that by altering the amount of Galinstan within the LM-based post, wideband continuous RF tuning can be achieved. For proof-of-concept demonstration purposes a tunable coaxial cavity resonator was designed, manufactured and measured. It demonstrated center frequency tuning between 4 and 10 GHz that corresponds to a 2.5: 1 tuning range. For these frequencies, the unloaded quality factor of the resonator was measured between 225 to 630, demonstrating the potential of LM tuning for low-loss and widely-reconfigurable RF filters.",
keywords = "cavity resonator, coaxial cavity, evanescent-mode, Galinstan, liquid metal, tunable resonator, wide tuning",
author = "Kshitij Sadasivan and Dimitra Psychogiou",
note = "Publisher Copyright: {\textcopyright} 2019 European Microwave Association (EuMA).; 49th European Microwave Conference, EuMC 2019 ; Conference date: 01-10-2019 Through 03-10-2019",
year = "2019",
month = oct,
doi = "10.23919/EuMC.2019.8910873",
language = "English",
series = "2019 49th European Microwave Conference, EuMC 2019",
publisher = "Institute of Electrical and Electronics Engineers Inc.",
pages = "300--303",
booktitle = "2019 49th European Microwave Conference, EuMC 2019",
address = "United States",
}