Abstract
Microwave resonators are widely used for numerous applications including communication, biomedical and chemical applications, material testing, and food grading. Split-ring resonators in both planar and nonplanar forms are a simple structure which has been in use for several decades. This type of resonator is characterized with low cost, ease of fabrication, moderate quality factor, low external noise interference, high stability, and so forth. Due to these attractive features and ease in handling, nonplanar form of structure has been utilized for material characterization in 1–5 GHz range. Resonant frequency and quality factor are two important parameters for determination of material properties utilizing perturbation theory. Shield made of conducting material is utilized to enclose split-ring resonator which enhances quality factor. This work presents a novel technique to develop shield around a predesigned nonplanar split-ring resonator to yield optimized quality factor. Based on this technique and statistical analysis regression equations have also been formulated for resonant frequency and quality factor which is a major outcome of this work. These equations quantify dependence of output parameters on various factors of shield made of different materials. Such analysis is instrumental in development of devices/designs where improved/optimum result is required.
Highlights
Split-ring resonator (SRR) [1], loop-gap resonator (LGR) [2,3,4], or open-loop resonator (OLR) [5] is an important component which is utilized in electronic and nonelectronic applications/utilities
Results of SRR structure with shield of different materials were obtained in a manner described in previous section
Similar observation was made for minimum value of resonant frequency and maximum value of Q factor except for structure with cast iron (CI) shield
Summary
Split-ring resonator (SRR) [1], loop-gap resonator (LGR) [2,3,4], or open-loop resonator (OLR) [5] is an important component which is utilized in electronic and nonelectronic applications/utilities. These include devices like oscillators, filters, tuned amplifiers, frequency meters, and processes like permittivity measurement, compositional analysis, quality control, and so forth. It has been shown that microwave method using split-ring resonator can be used for highly sensitive compositional analysis [6, 7] for various materials In this technique material under test (MUT) is placed inside SRR in a region of maximum electric field strength. Key to enhancing sensitivity and resolution in analysis through this technique is the optimization of Q factor pertaining to SRR structure
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