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首页> 外文期刊>International Journal of Microwave and Wireless Technologies >Tri-band dual circularly polarized planar antenna with defective ground structure for wireless applications
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Tri-band dual circularly polarized planar antenna with defective ground structure for wireless applications

机译：具有不良接地结构的三频双圆极化平面天线，用于无线应用

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摘要

A novel tri-band asymmetric slot with defective ground structure (DGS) microstrip antenna for dual circular polarization (CP) is proposed. By placing a slot with 45 degrees across diagonally at the center of the patch, excites resonant bands with narrow bandwidth and dual CP operation. The main design challenge is to introduce optimized defected element of circular dumbbell shape to enhance the impedance bandwidth with frequency shift operation at all bands. DGS enabled antenna is practically fabricated and simulated. Antenna is compact in size and shows a good quality of CP at two resonant bands and linearly polarized at one band. Structure displays the impedance bandwidth of 8% (2.26-2.45 GHz), 5.45% (3.41-3.6 GHz) and 3.07% (5.12-5.28 GHz). The design also shows 40 and 11 MHz, 3-dB axial ratio bandwidth at lower and middle bands, respectively. Simulated gain for each band is 4.72, 6.2 and 4 dB. Performance of antenna with and without DGS is also studied and compared. This single probe feed proposed antenna remains consistent with good radiation patterns and sufficient antenna gain over the operating bands. Excellent agreement was obtained between measurements and simulations.
机译：提出了一种用于双圆极化（CP）的具有缺陷接地结构（DGS）微带天线的新型三频非对称缝隙。通过在贴片的中心对角线放置一个45度角的缝隙，可以激发具有窄带宽和双CP操作的谐振频带。主要的设计挑战是引入优化的圆形哑铃状缺陷元件，以通过在所有频带上进行频移操作来增强阻抗带宽。具有DGS功能的天线实际上已经过制造和仿真。天线尺寸紧凑，在两个谐振频段显示出高质量的CP，在一个频段线性极化。结构显示的阻抗带宽为8％（2.26-2.45 GHz），5.45％（3.41-3.6 GHz）和3.07％（5.12-5.28 GHz）。该设计还显示了在较低和中频带分别为40 MHz和11 MHz的3-dB轴向比率带宽。每个频段的模拟增益分别为4.72、6.2和4 dB。还研究和比较了带有和不带有DGS的天线性能。建议的这种单探头馈电天线在工作频带上保持良好的辐射方向图和足够的天线增益。测量和模拟之间获得了极好的一致性。

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