Moreover, the simulated resonance frequency (8.84 GHz) as well as the corresponding experimental magnitude (8.86 GHz) and value obtained for the equivalent circuit (8.74 GHz) are all located in the X-band of the microwave region.
The measured scattering parameters and data obtained for the equivalent circuit are further used to verify the CST-based simulation results.
The CST Microwave Studio electromagnetic simulator is used to design the structure, extract scattering parameters, and determine structural characteristics, whereas the Advance Design Software is utilized to perform simulations for the equivalent circuit of the proposed resonator. The multipole moments and the multipole decomposition of the extinction and scattering cross sections are calculated using the expressions for the Cartesian multipole moments. For independent tests of our results, the method of Discrete Dipole Approximation (DDA) 57 is used as well. It is found that the NRI bandwidth of the conventional SRR is increased by almost a factor of two after tunnel insertion. realized in CST Microwave Studio and COMSOL Multiphysics. (c) Simulated reflection phase difference between the resistive patch. INTRODUCTION Substrate-integrated waveguide (SIW) circuits form a reasonable compromise between microstrip and waveguide technologies 1. The true complex permittivity can then be found by optimization, as demonstrated in several recent papers Díaz-Morcillo et al. Index Terms Substrate-integrated waveguide technology, numerical modeling, mode-matching techniques, computer-aided design. More generally, an inverse scattering approach can be applied, where synthetic scattering parameters are generated with a full-wave simulation model for given sample shape and permittivity. New design tools for filter synthesis, phased array creation and decoupling capacitor optimization supplement the tight integration with the antenna synthesis tool, Antenna Magus, and the matching circuit synthesis tool, Optenni Lab. commercially available field solver CST Microwave Studio. In this work, a modified RLC-based resonator with a large bandwidth of the negative refractive index (NRI) equal to almost 3.40 GHz has been realized in its operating region by adding a tunnel structure, and its electric and magnetic properties are determined by investigating the tunneling effect produced by a conventional split-ring resonator (SRR). The curves displayed were obtained from unit-cell simulation in CST Microwave Studio. With the release of the CST STUDIO SUITE® 2015, synthesis, design and optimization are now more tightly integrated into the simulation workflow.