Modeling of symmetric composite right/left-handed coplanar waveguides with applications to compact bandpass filters
- 7 November 2005
- journal article
- Published by Institute of Electrical and Electronics Engineers (IEEE) in IEEE Transactions on Microwave Theory and Techniques
- Vol. 53 (11), 3460-3466
- https://doi.org/10.1109/tmtt.2005.857114
Abstract
This study proposes an equivalent-circuit model for the composite right/left-handed (CRLH) coplanar waveguide (CPW) comprising the series interdigital capacitor and shunt meandering short-circuited stub inductor in symmetric configuration. The new technique for extracting the equivalent-circuit elements of the CRLH CPW, which include inductances, capacitances, and resistances to represent the left-handed, right-handed, and lossy characteristics, is developed based on the effective medium concept. The applications to the compact resonators and filters are presented to emphasize the unique features of the CRLH CPW. A novel CRLH CPW resonator with a 0/spl deg/ effective electrical length at resonance is proposed, which gives a 49.1% size reduction when compared with the conventional half-wavelength resonator at 5 GHz. Based on the zeroth-order CRLH CPW resonators, an inductively coupled two-pole bandpass filter with 5.4% 3-dB bandwidth and 2.7-dB insertion loss at 5 GHz is implemented, and it is 51.4% more compact than the conventional structure. A good agreement among the results of the full-wave simulation, equivalent-circuit model, published data, and measurement demonstrates the effectiveness of the proposed modeling technique. To suppress the higher order harmonic spurious passbands, the electromagnetic-bandgap CPW structures are incorporated into the proposed CRLH CPW filter.Keywords
This publication has 20 references indexed in Scilit:
- Transmission lines on periodic bandgap metamaterials: from microwaves to optics applicationsJournal of Optics A: Pure and Applied Optics, 2005
- Super compact split ring resonators CPW band pass filtersPublished by Institute of Electrical and Electronics Engineers (IEEE) ,2004
- Composite right/left-handed transmission line metamaterialsIEEE Microwave Magazine, 2004
- Transmission Line Approach of Left-Handed (LH) Materials and Microstrip Implementation of an Artificial LH Transmission LineIEEE Transactions on Antennas and Propagation, 2004
- Time-Domain Measurement of Negative Group Delay in Negative-Refractive-Index Transmission-Line MetamaterialsIEEE Transactions on Microwave Theory and Techniques, 2004
- A reflectodirective system using a composite right/left-handed (CRLH) leaky-wave antenna and heterodyne mixingIEEE Microwave and Wireless Components Letters, 2004
- A Novel Composite Right-/Left-Handed Coupled-Line Directional Coupler With Arbitrary Coupling Level and Broad BandwidthIEEE Transactions on Microwave Theory and Techniques, 2004
- Characteristics of the composite right/left-handed transmission linesIEEE Microwave and Wireless Components Letters, 2004
- Left handed coplanar waveguide band pass filters based on bi-layer split ring resonatorsIEEE Microwave and Wireless Components Letters, 2004
- Planar negative refractive index media using periodically L-C loaded transmission linesIEEE Transactions on Microwave Theory and Techniques, 2002