Journal of Electrical and Electronics Engineering (Oct 2017)
A Highly Compact ZOR based on CRLH TL
Abstract
Design and development of a highly compact zeroth order resonator (ZOR) based on composite right/left handed transmission line (CRLH TL) is reported in this paper. The ZOR is based on single unit-cell CRLH TL. The unit-cell of CRLH TL is realized using series modified inter digital capacitor (IDC) in shunt with the shorted inductive stubs to ground. The ZOR is excited by coplanar waveguide (CPW) fed. Because of the CPW-fed, the shorting of stub to the ground does not require any via, which minimizes the overall fabrication steps and time. The resonance frequency and fractional bandwidth (FWB) of the proposed ZOR are 3.02 GHz and 8.4 % respectively. The ZOR exhibits the good passband S-parameters characteristics with return-loss, (|S_11 |dB) of – 21.6 dB and insertion-loss, (|S_21 |dB) of -0.6 dB at resonance frequency. The -10 dB return-loss bandwidth of the resonator is found as 81 MHz. The ZOR is highly compact in size, 14.1 × 6.6 mm2 that is, 0.21 λ_g× 0.098 λ_g, where λ_g, is the guided wavelength of the medium with relative permittivity 2.2. The circuit model tool of Ansoft Designer is used to find out the performance of the equivalent lumped circuit model of the ZOR. The layout of the proposed ZOR is designed and performances are evaluated using electromagnetic simulator, IE3D. The developed ZOR performances are measured using Agilent vector network analyzer (VNA). All measured results are found in good resemblance with the simulated results.
