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首页> 外文会议>European Conference on Antennas and Propagation >A Coplanar-Strip-Based Excitation Technique for Wide 3-dB Axial Ratio Beamwidth and Enhanced Circular Polarization Antenna
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A Coplanar-Strip-Based Excitation Technique for Wide 3-dB Axial Ratio Beamwidth and Enhanced Circular Polarization Antenna

机译：基于共平面条纹的激励技术，用于宽3-dB轴比波束宽度和增强型圆极化天线

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摘要

This paper presents a new feeding technique for excitation of circular polarization (CP) in a planar wide-slot antenna with enhanced axial ratio (AR) bandwidth and wide 3 dB AR beamwidth. To achieve a wide 3 dB AR beamwidth, two parasitic L-shape strips are positioned coplanar to the microstrip line extension of an asymmetrical coplanar waveguide (CPW). For additional CP modes, a horizontal strip is protruded from the vertical edge of the ground plane towards the center of the slot etched in the ground plane. With this technique, not only the 3 dB AR beamwidth is improved but also a wide AR bandwidth is obtained. The total footprint of the antenna realized using the outlined approach is Ls × Ws = 0.3 λ0 × 0.28 λ0 with λ0 being the free space wavelength at the lowest operating frequency of the antenna. Additionally, a wide impedance bandwidth of up to 72-percent (2.26 GHz-4.85 GHz) is achieved along with the AR bandwidth of 66% (2.44 GHz- 4.87 GHz). Furthermore, for the 58-percent of the total AR bandwidth a wide 3 dB beamwidth of 85° ± 5° is maintained without involving any complex circuitry. Finally, the antenna features realized gain of 3.7 dBi (averaged over the entire operating band).
机译：本文提出了一种新的馈电技术，用于激励平面极化宽缝天线中的圆极化（CP），该天线具有增强的轴向比率（AR）带宽和3 dB的AR波束宽度。为了获得3 dB的宽AR光束宽度，将两个寄生L形条带放置在与非对称共面波导（CPW）的微带线延长线共面的位置。对于其他CP模式，水平条从接地平面的垂直边缘向在接地平面中蚀刻的插槽的中心突出。利用该技术，不仅改善了3 dB的AR波束宽度，而且获得了宽的AR带宽。使用概述的方法实现的天线总占地面积为L s ×W s = 0.3λ 0 ×0.28λ 0 与λ 0 是天线最低工作频率下的自由空间波长。此外，可实现高达72％（2.26 GHz-4.85 GHz）的宽阻抗带宽以及66％（2.44 GHz- 4.87 GHz）的AR带宽。此外，对于总AR带宽的58％，在不涉及任何复杂电路的情况下，可保持85°±5°的3 dB宽波束宽度。最终，天线功能实现了3.7 dBi的增益（在整个工作频带内平均）。

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