Abstract
This article presents a broadband circularly polarized composite right/left-hand (CRLH) antenna. A compact microstrip line inductor and an interdigital capacitor are used to form a left-handed parallel inductor and a left-handed series capacitor. The metamaterial parameters of the series inductor and the parallel inductor are optimized. The asymmetric perturbation is introduced to excite the circularly polarized (CP) electromagnetic wave. The influence of interdigital capacitance on the electrical performance of the antenna is analyzed theoretically and experimentally. The value of CL is changed to reduce the electrical size of the antenna, and the resonant frequency of the antenna is reduced accordingly. The physical dimensions of this CPW-Fed monopole antenna are 25 mm ∗ 24 mm ∗ 1 mm. The measured 10 dB wide impedance bandwidth is 79.5%, and the measured 3 dB axial ratio (AR) bandwidth is 56.2%.
Highlights
Caloz and Itoh have presented the transmission line theory of left-handed (LH) materials
A transmission line structure with periodic inductance and capacitance loading is used to realize left-handed materials [1]. e input impedance and radiation patterns of an antenna can be manipulated by loading parameters of a metamaterial transmission line (TL) unit cell. is approach can reduce the resonant frequency and result in multiband impedance matching [2]
Some researchers use microwave metamaterial loading to reduce the size of microstrip antennas and introduce phase perturbation to make the antennas radiate circularly polarized electromagnetic waves
Summary
Zhongshan Institute, University of Electronic Science and Technology of China, Zhongshan, China. Is article presents a broadband circularly polarized composite right/left-hand (CRLH) antenna. A compact microstrip line inductor and an interdigital capacitor are used to form a left-handed parallel inductor and a left-handed series capacitor. E metamaterial parameters of the series inductor and the parallel inductor are optimized. E asymmetric perturbation is introduced to excite the circularly polarized (CP) electromagnetic wave. E influence of interdigital capacitance on the electrical performance of the antenna is analyzed theoretically and experimentally. E value of CL is changed to reduce the electrical size of the antenna, and the resonant frequency of the antenna is reduced . E physical dimensions of this CPW-Fed monopole antenna are 25 mm ∗ 24 mm ∗ 1 mm. A compact microstrip line inductor and an interdigital capacitor are used to form a left-handed parallel inductor and a left-handed series capacitor. e metamaterial parameters of the series inductor and the parallel inductor are optimized. e asymmetric perturbation is introduced to excite the circularly polarized (CP) electromagnetic wave. e influence of interdigital capacitance on the electrical performance of the antenna is analyzed theoretically and experimentally. e value of CL is changed to reduce the electrical size of the antenna, and the resonant frequency of the antenna is reduced . e physical dimensions of this CPW-Fed monopole antenna are 25 mm ∗ 24 mm ∗ 1 mm. e measured 10 dB wide impedance bandwidth is 79.5%, and the measured 3 dB axial ratio (AR) bandwidth is 56.2%
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