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EVALUATION OF SPLIT-RING RESONATOR FABRICATED USING LASER CUTTING AND CNC METHODS **

Abstract

The Split-Ring Resonator (SRR) is a fundamental component in the field of metamaterials and has been significantly developed in the past years. The typical structure is the split rings with specific gap. It has been used in different applications, such as communication, antenna design and sensing. In this on-going project, we focus on developing efficient and cost-effective methods for fabricating SRR devices. Our approaches involve utilizing accessible techniques, specifically laser cutting and computer numerical control (CNC) machining to create the SRR structures. Laser cutting techniques were used to generate the pattern onto a coated copper board, followed by removing the copper part and produce the SRR device. Meanwhile, CNC engraving was utilized to directly draft the SRR shape. It is demonstrated that both methods have successfully produced the desired devices. The laser cutting exhibited superior precision compared to the CNC methods since the minimum engraving dot diameter is about 0.2 mm, and the CNC resolution is limited by its drill size which is approximately 2 mm. CNC method showed the convenience in its applications since no extra coating and copper etching are required. Next the both fabrication methods are used to fabricate the SRR devices with the identical design parameters. The electromagnetic characteristics of the devices is evaluated with the network analyzer. The resonance frequencies are theoretically derived and compared to the experimental results. The project offers the feasibility of accessible fabrication techniques for SRRs, providing their respective advantages and limitations. Future development of these techniques is promising to enhance the efficiency and prevision of SRR device fabrication and applications.

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