Biodegradable Microwave Cavity Resonator

Mohammad Javad Bathaei; Sina Hashemizadeh; Filipe Arroyo Cardoso; Denys Nikolayev; Clementine M. Boutry

doi:10.1109/LMWT.2025.3588738

Biodegradable Microwave Cavity Resonator

Mohammad Javad Bathaei, Sina Hashemizadeh, Filipe Arroyo Cardoso, Denys Nikolayev, Clementine M. Boutry^*

^*Corresponding author for this work

Research output: Contribution to journal › Article › Scientific › peer-review

Abstract

This letter presents the first fabrication and characterization of a biodegradable coaxial cavity resonator, focusing on the measurement of complex permittivity of encapsulation as well as |S₁₁| and impedance parameters. The resonator components are 3D-printed from plant-based resin, coated with silver-coated copper flakes, and enclosed by a laser-cut zinc membrane. A monopole coupler antenna, inspired by the “Great Seal Bug,” is co-designed with the cavity to enable near-field coupling and achieve frequency-selective, near- 50 Ω impedance-matched wireless sensing. Numerical and experimental analysis of the gap between post and membrane (G-post), and between the coupler antenna and post, resulted in| S₁₁ | of −30.3 dB at 1.7 GHz, and a quality factor of 307, outperforming existing flat biodegradable resonators. A 40-MHz resonance shift is observed with a 20 μm variation in G-post, highlighting the resonator’s high sensitivity to membrane position. This system enables battery-free wireless sensing with biodegradable antennas for biodiversity monitoring.

Original language	English
Pages (from-to)	1736-1739
Number of pages	4
Journal	IEEE Microwave and Wireless Technology Letters
Volume	35
Issue number	11
DOIs	https://doi.org/10.1109/LMWT.2025.3588738
Publication status	Published - 2025

Bibliographical note

Green Open Access added to TU Delft Institutional Repository as part of the Taverne amendment. More information about this copyright law amendment can be found at https://www.openaccess.nl. Otherwise as indicated in the copyright section: the publisher is the copyright holder of this work and the author uses the Dutch legislation to make this work public.

Keywords

3-D printing
biodegradable materials
cavity resonator
laser cutting

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title = "Biodegradable Microwave Cavity Resonator",

abstract = "This letter presents the first fabrication and characterization of a biodegradable coaxial cavity resonator, focusing on the measurement of complex permittivity of encapsulation as well as |S11| and impedance parameters. The resonator components are 3D-printed from plant-based resin, coated with silver-coated copper flakes, and enclosed by a laser-cut zinc membrane. A monopole coupler antenna, inspired by the “Great Seal Bug,” is co-designed with the cavity to enable near-field coupling and achieve frequency-selective, near- 50 Ω impedance-matched wireless sensing. Numerical and experimental analysis of the gap between post and membrane (G-post), and between the coupler antenna and post, resulted in| S11 | of −30.3 dB at 1.7 GHz, and a quality factor of 307, outperforming existing flat biodegradable resonators. A 40-MHz resonance shift is observed with a 20 μm variation in G-post, highlighting the resonator{\textquoteright}s high sensitivity to membrane position. This system enables battery-free wireless sensing with biodegradable antennas for biodiversity monitoring.",

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note = "Green Open Access added to TU Delft Institutional Repository as part of the Taverne amendment. More information about this copyright law amendment can be found at https://www.openaccess.nl. Otherwise as indicated in the copyright section: the publisher is the copyright holder of this work and the author uses the Dutch legislation to make this work public. ",

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AU - Boutry, Clementine M.

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Biodegradable Microwave Cavity Resonator

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