Efficient, High Directivity, Large Front-to-Back-Ratio, Electrically Small, Near-Field-Resonant-Parasitic Antenna
Efficient, High Directivity, Large Front-to-Back-Ratio, Electrically Small, Near-Field-Resonant-Parasitic Antenna
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DOI：
10.1109/access.2013.2259134
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发表时间：
2013-01-01
期刊：
影响因子：
3.9
通讯作者：
Ziolkowski, Richard W.
中科院分区：
文献类型：
--
作者：
Tang, Ming-Chun;Ziolkowski, Richard W.
增强的方向性和前后比（FTBR）的超材料启发的电小，线极化，同轴馈电埃及轴偶极子天线被认为是。他们完成了一个特定的增强的原始近场谐振寄生（NFRP）天线与一个额外的NFRP元件，一个小圆盘导体修改两个曲折线形槽。整个系统的数值评估与两个独立的计算电磁学模拟器。优化的结果证明了电小天线（即，ka < 1.0）具有相当低的轮廓（即，高度类似于λ/10），将方向性从1.77提高到6.32 dB，将FTBR从0增加到> 20 dB，并保持大的半功率波束宽度，同时具有超过80%的辐射效率，与50 Ω源几乎完全匹配。
Enhancements of the directivity and front-to-back ratio (FTBR) of a metamaterial-inspired electrically small, linearly polarized, coaxially-fed Egyptian axe dipole antenna are considered. They are accomplished with a particular augmentation of the original near-field-resonant-parasitic (NFRP) antenna with an additional NFRP element, a small disc conductor modified with two meanderline-shaped slots. The entire system is evaluated numerically with two independent computational electromagnetics simulators. The optimized results demonstrate an electrically small antenna (i.e., ka < 1.0) with a reasonably low profile (i.e., height similar to lambda/10) that improves the directivity from 1.77 to 6.32 dB, increases the FTBR from 0 to > 20 dB, and maintains large half-power beamwidths, while having a radiation efficiency over 80% with nearly complete matching to a 50 Omega source.