Continuously Tunable 3-D Printed Helical Resonators and Bandpass Filters Using Actuated Liquid Metals
Dyussembayev A. Psychogiou D.
1 July 2022Institute of Electrical and Electronics Engineers Inc.
IEEE Microwave and Wireless Components Letters
2022#32Issue 7855 - 858 pp.
This letter reports on a new class of agile helical resonators and bandpass filters (BPFs) with continuously-tunable center frequency. RF tuning is achieved by altering the liquid metal (LM) volume within an additively-manufactured plastic tube that has the shape of a helix and forms the inner conductor of the helical resonator. A low-cost and versatile integration scheme using 3-D printing and pneumatically-actuated Galinstan is proposed. For proof-of-concept validation purposes, a helical resonator with center frequency tuning between 1 and 1.5 GHz, and unloaded quality factor between 131 and 145 was manufactured and measured. Two BPF porotypes namely: 1) two-pole BPF with center frequency tuning between 1.16 and 1.49 GHz and insertion loss (IL) < 2 dB and 2) three-pole BPF with center frequency tuning between 1.18 and 1.49 GHz, and IL < 2.1 dB, were manufactured and tested at L -band.
Bandpass filter (BPF) , cavity filter , helical filter , helical resonator , tunable filter
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University of Colorado Boulder, Department of Electrical, Computer, and Energy Engineering, CO, Boulder, 80309, Kazakhstan
Llp Sktb Granit, Almaty, 050060, Kazakhstan
University College Cork, School of Engineering, Cork, T12 K8AF, Ireland
Tyndall National Institute, Cork, T12 R5CP, Ireland
University of Colorado Boulder
Llp Sktb Granit
University College Cork
Tyndall National Institute
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