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首页> 外文期刊>Antennas and Propagation, IEEE Transactions on >Independently Tunable Low-Profile Dual-Band High-Impedance Surface Antenna System for Applications in UHF Band
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Independently Tunable Low-Profile Dual-Band High-Impedance Surface Antenna System for Applications in UHF Band

机译：适用于UHF频段的可独立调谐的薄型双频高阻抗表面天线系统

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摘要

An independently tunable low-profile dual-band high-impedance surface (HIS) antenna system is presented which employs a single layer cross bow-tie dual-band tunable HIS ground plane with a printed wideband monopole antenna designed to cover the UHF band. The unit cell of the proposed HIS ground plane is 19.71 mm by 19.71 mm with thickness of 1.74 mm. Simulations of the HIS ground plane have illustrated that either single or dual-band reconfigurable reflection phase resonances can be achieved between 0.95 GHz and 2.45 GHz by controlling ${rm C}1$ (4.55 pF~0.6 pF) and ${rm C}2$ (4.55 pF~0.6 pF) independently which represent the two groups of varactor diodes mounted on the surface elements of the HIS. Simulations with the wideband antenna 4 mm above the HIS ground plane illustrate an effective tunable operational bandwidth from 1.07 GHz to 2.75 GHz with a dual-band capability. Parametric studies indicate the radiation efficiency of the system increases as the antenna height is increased and the diode resistance is reduced. The radiation efficiency also increases with the frequency in general over the tunable frequency range and with the optimum parameters typical values from $-{hbox {4}}~{hbox {dB}}$ to $-{hbox {2}}~{hbox {dB}}$ can be achieved. The proposed HIS ground plane and the wideband antenna have been fabricated with Toshiba 1SV245 varactor diodes and it has shown an effective tunable bandwidth from 0.9 GHz to 2.8 GHz approximately with the dual band capability.
机译：提出了一种可独立调谐的低剖面双频带高阻抗表面（HIS）天线系统，该系统采用单层交叉蝴蝶结双频带可调谐HIS接地层，并带有设计用于覆盖UHF频带的印刷宽带单极天线。提议的HIS接地平面的晶胞为19.71 mm x 19.71 mm，厚度为1.74 mm。 HIS接地平面的仿真表明，通过控制$ {rm C} 1 $（4.55 pF〜0.6 pF）和$ {rm C}，可以在0.95 GHz和2.45 GHz之间实现单波段或双波段可重构反射相位谐振。 2 $（4.55 pF〜0.6 pF）分别表示安装在HIS表面元件上的两组变容二极管。在HIS接地平面上方4 mm处使用宽带天线进行的仿真说明了具有双频功能的有效可调工作带宽（从1.07 GHz到2.75 GHz）。参数研究表明，随着天线高度的增加和二极管电阻的减小，系统的辐射效率也会提高。辐射效率通常也会随着频率在可调频率范围内的增加而增加，并且具有最佳参数，典型值从$-{hbox {4}}〜{hbox {dB}} $到$-{hbox {2}}〜{ hbox {dB}} $可以实现。拟议的HIS接地平面和宽带天线是用Toshiba 1SV245变容二极管制造的，在0.9 GHz至2.8 GHz的有效可调带宽范围内，具有双频能力。

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