Abstract
In this paper, a microwave cavity resonator is presented for chemical sensing applications. The proposed resonator is comprised of a three dimensional (3D) split-ring resonator (SRR) residing in an external cavity and capacitively coupled by a pair of coaxial probes. 3D-printing technology with polylactic acid (PLA) filament is used to build the 3D SRR and cavity. Then, the surfaces of the SRR and the inside walls of cavity are silver-coated. The novelty of our proposed structure is its light weight and inexpensive design, owing to the utilization of low density and low-cost PLA. A Teflon tube is passed through the split-gap of the SRR so that it is parallel to the applied electric field. With an empty tube, the resonance frequency of the structure is measured at 2.56 GHz with an insertion loss of 13.6 dB and quality factor (Q) of 75. A frequency shift of 205 MHz with respect to the empty channel was measured when deionized water (DIW) was injected into the tube. Using volume occupied by the structure, the weight of the proposed microwave resonator is estimated as 22.8 g which is significantly lighter than any metallic structure of comparable size.
Highlights
Additive manufacturing (AM) technology, called three-dimensional (3D) printing, rapid prototyping, and layered printing, is an approach in which 3D structures are directly printed from a computer-aided design (CAD) file without any part-specific tools and dies [1]
A 3D split-ring resonator (SRR) is placed inside a cavity and a Teflon tube is passed through the SRR so that phenomenon
A 3D SRR is placed inside a cavity and a Teflon tube is passed through the SRR so that the tube is parallel to the electric field of the incident EM wave
Summary
Additive manufacturing (AM) technology, called three-dimensional (3D) printing, rapid prototyping, and layered printing, is an approach in which 3D structures are directly printed from a computer-aided design (CAD) file without any part-specific tools and dies [1]. There are two main reasons behind the use of FDM-based 3D printing technique to fabricate the proposed geometry: (1) Using the 3D printing technique, the geometries (cavity, sensor) have been constructed using lightweight PLA Material and thereafter metal coating has been uniformly deposited. This significantly reduces the overall weight as well as fabrication cost of the design; (2) The cavity has been made using perforated dielectric, to further reduce the amount of the constituent PLA material.
Sign-in/Register to view highlights & summary Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
