Numerical Simulations of Backward-to-Forward Leaky-Wave Antenna with Composite Right/Left-Handed Coplanar Waveguide
SI Li-Ming1,2, SUN Hou-Jun1, LV Xin1
1Department of Electronic Engineering, School of Information Science and Technology, Beijing Institute of Technology, Beijing 100081 2Electrical and Computer Engineering Department, University of Arizona, Tucson, AZ 85721, USA
Numerical Simulations of Backward-to-Forward Leaky-Wave Antenna with Composite Right/Left-Handed Coplanar Waveguide
SI Li-Ming1,2, SUN Hou-Jun1, LV Xin1
1Department of Electronic Engineering, School of Information Science and Technology, Beijing Institute of Technology, Beijing 100081 2Electrical and Computer Engineering Department, University of Arizona, Tucson, AZ 85721, USA
摘要A composite right/left-handed (CRLH) coplanar waveguide (CPW) structure and its leaky-wave antenna (LWA) with continuous backward-to-forward scanning applications are proposed. The structure of the CRLH transmission line (TL) is composed of split-ring resonators (SRRs) for left-handed (LH) series capacitance and short-circuited stubs connected between the CPW central signal line and the ground for LH shunt inductance, while the unavoidable right-handed (RH) parasitic effects series inductance and shunt capacitance are generated by wave propagation through the host transmission line. The dispersion relations are calculated and compared with the equivalent circuit model method and 3D full-wave simulations, which can be used to determine the physical dimensions of the CRLH-CPW, such as in the balanced CRLH-TL case. As a main example, a CRLH-CPW-LWA operating from 1.67 GHz to 1.80 GHz with the dispersion characteristics of the balanced CRLH-TL case shows continuous leakage frequency band (fast wave region) from LH (phase constant β <0, .67<f<1.74 GHz) to RH (β>0, 1.74<f<1.80 GHz) state through the transition frequency point (β=0, f=1.74 GHz), whereas conventional LWAs operated in RH state only provide forward scanning capabilities (β>0).
Abstract：A composite right/left-handed (CRLH) coplanar waveguide (CPW) structure and its leaky-wave antenna (LWA) with continuous backward-to-forward scanning applications are proposed. The structure of the CRLH transmission line (TL) is composed of split-ring resonators (SRRs) for left-handed (LH) series capacitance and short-circuited stubs connected between the CPW central signal line and the ground for LH shunt inductance, while the unavoidable right-handed (RH) parasitic effects series inductance and shunt capacitance are generated by wave propagation through the host transmission line. The dispersion relations are calculated and compared with the equivalent circuit model method and 3D full-wave simulations, which can be used to determine the physical dimensions of the CRLH-CPW, such as in the balanced CRLH-TL case. As a main example, a CRLH-CPW-LWA operating from 1.67 GHz to 1.80 GHz with the dispersion characteristics of the balanced CRLH-TL case shows continuous leakage frequency band (fast wave region) from LH (phase constant β <0, .67<f<1.74 GHz) to RH (β>0, 1.74<f<1.80 GHz) state through the transition frequency point (β=0, f=1.74 GHz), whereas conventional LWAs operated in RH state only provide forward scanning capabilities (β>0).
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2010, Vol. 27 
