{'fraction_non_alphanumeric': 0.03451492537313433, 'fraction_numerical': 0.016791044776119403, 'mean_word_length': 5.202312138728324, 'pattern_counts': {'":': 0, '<': 0, '<?xml version=': 0, '>': 0, 'https://': 0, 'lorem ipsum': 0, 'www.': 0, 'xml': 0}, 'pii_count': 0, 'substrings_counts': 0, 'word_list_counts': {'cursed_substrings.json': 0, 'profanity_word_list.json': 0, 'sexual_word_list.json': 0, 'zh_pornsignals.json': 0}}
Widely-Reconfigurable 2.5:1 Coaxial-Cavity Resonators Using Actuated Liquid-Metal Posts

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.