Title :
Wideband Passband Transmission Line Based on Metamaterial-Inspired CPW Balanced Cells
Author :
Borja, A.L. ; Belenguer, A. ; Cascón, J. ; Esteban, H. ; Boria, V.E.
Author_Institution :
Dept. de Ing. Electr., Electron., Autom. y Comun., Univ. de Castilla-La Mancha, Cuenca, Spain
fDate :
7/3/1905 12:00:00 AM
Abstract :
In this letter, a balanced metamaterial-inspired coplanar waveguide transmission line with enhanced bandwidth is presented. The coplanar waveguide line is composed of a basic cell with two split-ring resonators, two series capacitances (interdigital capacitors), two wide shunt inductances (metallic strips), and four shunt capacitances (implemented through open-ended stubs). The use of split-ring resonators together with metallic shunt strips provides negative permeability and permittivity, respectively. Likewise, the employment of additional series and shunt capacitances permits to control both the left- and right-handed bands, thus achieving a balanced composite transmission line. The configuration exhibits a wide bandpass response as a result of this balance between advance and delay phase offsets. The interpretation is based on an equivalent circuit model, full-wave electromagnetic analysis, and measured responses of a prototype designed for microwave (C-band) frequency operation. Due to the small dimensions of the resonators employed, the resulting line is very compact. Potential use of these transmission lines can be foreseen in many applications concerning planar microwave devices with severe size restrictions and wide frequency bandpass responses.
Keywords :
capacitance; coplanar transmission lines; coplanar waveguides; equivalent circuits; inductance; metamaterials; microwave resonators; permeability; permittivity; balanced metamaterial-inspired coplanar waveguide transmission line; composite transmission line; delay phase offsets; equivalent circuit model; full-wave electromagnetic analysis; left-handed band; metallic shunt strips; metamaterial-inspired CPW balanced cell; microwave frequency operation; negative permeability; negative permittivity; planar microwave device; right-handed band; shunt capacitance; shunt inductance; split-ring resonator; wide frequency bandpass response; wideband passband transmission line; Band pass filters; Coplanar waveguides; Integrated circuit modeling; Microwave filters; Optical ring resonators; Strips; Transmission line measurements; Coplanar waveguide (CPW) transmission line; filters; metamaterials; split-ring resonator (SRR);
Journal_Title :
Antennas and Wireless Propagation Letters, IEEE
DOI :
10.1109/LAWP.2011.2178385