A Novel Symmetrical Split Ring Resonator Based on Microstrip for Microwave Sensors

Abstract

In this paper, novel symmetrical split ring resonator (SSRR) is proposed as a suitable component for performance enhancement of microwave sensors. SSRR has been employed for enhancing the insertion loss of the microwave sensors. Using the same device area, we can achieve a high Q-factor of 141.54 from the periphery enhancement using Quasi-linear coupling SSRR, whereas loose coupling SSRR can achieve a Q-factor of 33.98 only. Using Quasi-linear coupling SSRR, the Q-factor is enhanced 4.16 times the loose coupling SSRR using the same device area. After the optimization was made, the SSRR sensor with loose coupling scheme has achieved a very high Qfactor value around 407.34 while quasi-linear scheme has achieved high Q-factor value of 278.78 at the same operating frequency with smaller insertion loss. Spurious passbands at 1st, 2nd, 3rd, and 4th harmonics have been completely suppressed well above -20 dB rejection level without visible changes in the passband filter characteristics. The most significant of using SSRR is to be used for various industrial applications such as food industry, quality control, bio-sensing medicine and pharmacy. The simulation result that Quasi-linear coupling SSRR is a viable candidate for the performance enhancement of microwave sensors has been verified.

Enhancement of microwave ring resonator based on poly-lactic acid thermoplastic substrate

“…Based on Figure 1, the design of the ring resonator consists of a single port and a coupling gap between the feed line and the ring, which is sufficient for the resonance condition as in (1), where R is the mean radius of the ring and n is the harmonic order of resonance [8,17,18]. 2 2…”

“…Next is finding the effective permittivity, . The formula is expressed in (2), where 𝑟 is the value of the dielectric constant of the substrate, h is the height of the substrate and d is the thickness of the substrate [8,17,18].…”

“…Bulletin of Electr Eng & Inf ISSN: 2302-9285  Thus, the guided wavelength λ g can be related to frequency by (3), where is the speed of light , is the resonant frequency and is the effective permittivity [8,17,18].…”

“…According to [16,17] an enhanced coupled MRR was introduced in their research. The larger distance between the feed line and the ring does not affect the resonant frequency.…”

A Submersible Printed Sensor Based on a Monopole-Coupled Split Ring Resonator for Permittivity Characterization

“…Each one of these rectangular elements are positioned at 1.25 mm from the resonator. The backside of the board is completely covered with copper (ground), and the overall area of the proposed sensor is 1750 mm mm 2 (35 × 50 mm) which makes it look as a compact device compared to previous dielectric sensors [24,25,26,51]. Other important parameters related with the proposed structure are summarized in Table 1.…”