Title :
Per-unit-length parameters of 1-D CPW metamaterials with simultaneously series-C and shunt-L loading
Author :
Gao, Jing ; Zhu, Lei
Author_Institution :
Sch. of Electr. & Electron. Eng., Nanyang Technol. Univ., Singapore
Abstract :
CPW transmission line metamaterials with simultaneous loading of series-C and shunt-L lumped elements in periodical intervals are thoroughly investigated using a self-calibrated method of moments (MoM). Two effective per-unit-length parameters, i.e., propagation constant and characteristic impedance, are numerically extracted to demonstrate the complete guided-wave characteristics of these 1-D artificial metamaterials in a wide frequency range, covering the LH stopband, LH passband, LH/RH stopband, RH passband and so on. In the LH passband, the phase constant with negative sign rises up to zero with the frequency while the characteristic impedance with only non-zero real part goes up from zero and then falls down beyond peak. Under perfect impedance matching in two terminals, finite-length CPW structures are consequently modeled to showcase the transmission performance across these 1-D metamaterials with varied lengths. Finally, a 9-unit cell CPW metamaterial fed by two 50-12 CPW feeding lines is designed, fabricated and measured to validate our reported effective per-unit-length parameters in experiment.
Keywords :
S-parameters; coplanar transmission lines; coplanar waveguides; equivalent circuits; metamaterials; method of moments; transmission line theory; 1D artificial metamaterials; CPW feeding lines; CPW transmission line; LH passband; LH stopband; RH passband; RH stopband; characteristic impedance; finite-length CPW structures; impedance matching; lumped elements; method of moments; per-unit-length parameters; periodic transmission lines; propagation constant; series-C loading; shunt-L loading; Coplanar waveguides; Frequency; Impedance matching; Metamaterials; Moment methods; Passband; Propagation constant; Transmission lines; Metamaterials; coplanar waveguide; effective per-unit-length parameters; periodic transmission lines; series-C and shunt-L loading;
Conference_Titel :
Microwave Conference Proceedings, 2005. APMC 2005. Asia-Pacific Conference Proceedings
Print_ISBN :
0-7803-9433-X
DOI :
10.1109/APMC.2005.1606181