The research of equivalent circuit of left-handed coplanar-waveguide transmission line element

2010 ◽  
Vol 107 (9) ◽  
pp. 09A941
Author(s):  
Jia-Hui Fu ◽  
Qun Wu ◽  
Kuang Zhang ◽  
Guo-Hui Yang ◽  
Fan-Yi Meng
Keyword(s):  
Transmission Line ◽  
Equivalent Circuit ◽  
Line Element ◽  
Coplanar Waveguide ◽  
Left Handed ◽  
Waveguide Transmission

scholarly journals Compact Wideband Dual-Frequency Antenna Based on a Simplified Composite Right/Left-Handed Transmission Line with Hilbert Curve Loading

2019 ◽  
Vol 2019 ◽  
pp. 1-8
Author(s):  
Tianpeng Li ◽  
Jian Zhang ◽  
Baowei Cheng ◽  
Xue Lei ◽  
Zhijian Xu ◽  
...  
Keyword(s):  
Transmission Line ◽  
Coplanar Waveguide ◽  
Antenna Design ◽  
Dual Frequency ◽  
Hilbert Curve ◽  
Order Resonance ◽  
Line Structure ◽  
Left Handed ◽  
Antenna Length ◽  
Bandwidth Broadening

This paper addresses the issues of low bandwidth, gain, and efficiency of miniaturized microwave antennas by proposing a novel wideband dual-frequency coplanar waveguide antenna design based on a simplified composite right/left-handed (SCRLH) transmission line structure with Hilbert curve loading. The multifrequency characteristics of the SCRLH transmission line structure are evaluated theoretically, and the antenna parameters promoting bandwidth broadening under zeroth-order resonance (ZOR) and first-order resonance (FOR) mode operation are evaluated. The bandwidth broadening in the ZOR and FOR modes is accordingly revealed to be independent of the antenna length, and the structure therefore facilitates wideband operation under miniaturization. Finally, the dual-frequency ZOR and FOR mode antenna design with center frequencies of f0 = 1.865 GHz and f1 = 2.835 GHz is validated via simulation, and the performance of a compact prototype antenna is evaluated experimentally. The −10 dB return loss bandwidths at f0 and f1 are 187 MHz (from 1.773 GHz to 1.96 GHz) and 368 MHz (from 3.002 GHz to 3.37 GHz), and the corresponding relative bandwidths are 10.1% and 11.5%, respectively. The experimentally measured peak gains and radiation efficiencies at f0 are 1.54 dB and 81.3%, respectively, and those at f1 are 1.71 dB and 74.2%, respectively.

Effective electromagnetic parameters of left-handed coplanar waveguide transmission lines

2011 ◽  
Vol 109 (7) ◽  
pp. 07A333 ◽  
Author(s):  
Jia-Hui Fu ◽  
Qun Wu ◽  
Guo-Hui Yang ◽  
Fan-Yi Meng ◽  
Jong-Chul Lee
Keyword(s):  
Transmission Lines ◽  
Coplanar Waveguide ◽  
Electromagnetic Parameters ◽  
Left Handed ◽  
Waveguide Transmission
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