Independently Tunable Low-Profile Dual-Band High-Impedance Surface Antenna System for Applications in UHF Band
Independently Tunable Low-Profile Dual-Band High-Impedance Surface Antenna System for Applications in UHF Band
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适用于 UHF 频段应用的独立可调谐薄型双频段高阻抗表面天线系统
DOI：
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发表时间：
2012
影响因子：
5.7
通讯作者：
R. Langley
中科院分区：
文献类型：
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作者：
Hyung;K. L. Ford;R. Langley
提出了一种可独立调谐的低剖面双频高阻抗表面（HIS）天线系统，该天线系统采用单层十字领结双频可调谐HIS接地面和设计用于覆盖UHF频带的印刷宽带微带天线。HIS接地面的单元格为19.71 mm × 19.71 mm，厚度为1.74 mm。HIS接地面的仿真表明，通过控制C1，可以在0.95 GHz和2.45 GHz之间实现单频带或双频可重构反射相位谐振（4.55 pF~0.6 pF）和C2（4.55 pF~0.6 pF）独立地表示安装在HIS的表面元件上的两组变容二极管。宽带天线4毫米以上的HIS接地平面的模拟示出了一个有效的可调工作带宽从1.07 GHz到2.75 GHz的双频能力。参数研究表明，系统的辐射效率随着天线高度的增加和二极管电阻的减小而增加。辐射效率也随着频率增加，一般在可调频率范围内，并与最佳参数的典型值从-4 dB到-2 dB可以实现。建议的HIS接地平面和宽带天线已与东芝1 SV 245变容二极管制造，它已显示出从0.9 GHz到2.8 GHz的有效可调谐带宽约与双频能力。
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 C1 (4.55 pF~0.6 pF) and C2 (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 -4 dB to -2 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.