Ultra Low Profile Dipole Antenna with a Simplified Feeding Structure and a Parasitic Element
Ultra Low Profile Dipole Antenna with a Simplified Feeding Structure and a Parasitic Element
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具有简化馈电结构和寄生元件的超薄偶极天线
DOI：
10.1093/ietcom/e89-b.2.576
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发表时间：
2004
期刊：
影响因子：
--
通讯作者：
Y. Kamata
中科院分区：
文献类型：
--
作者：
A. Thumvichit;T. Takano;Y. Kamata
本研究致力于半波偶极子与导体平面的距离远小于四分之一波长，我们指定为超低剖面偶极子（ULPD）天线在本文中。ULPD天线的关注点是馈电方法和阻抗匹配，因为输入阻抗通常会由于其附近的金属结构的存在而降低。在本文中，我们提出了一个ULPD天线具有良好的阻抗匹配和同轴馈电内置在天线结构，使外部匹配和巴伦是不需要的。同轴电缆用作馈线，并延伸为半波长偶极子的一半。另一半由寄生元件组成，该寄生元件连接到同轴辐射器的外导体。为了进行匹配，同轴辐射器的外导体以合适的长度被剥离，并且偶极子的总长度被考虑用于其在2GHz的期望频率下的谐振。实验已经进行。结果表明，回波损耗为-27 dB，在垂直于导体平面的方向上的最大增益为9 dBi。计算结果与实验结果吻合较好。
This study is devoted to a half-wave dipole with a conductor plane at a distance much smaller than a quarter wavelength which we designate as an ultra low profile dipole (ULPD) antenna in this paper. The concerns of ULPD antenna are the feeding method and the impedance matching, because the input impedance usually tends to be lowered by the existence of a metallic structure in its proximity. In this paper, we propose a ULPD antenna with an excellent impedance matching and a coaxial feed built within the antenna structure so that the external matching and a balun are not required. A coaxial cable is used as a feed line and extended to be a half of a half wavelength dipole. The other half is made up of a parasitic element, which is connected to the outer conductor of the coaxial radiator. To make a matching, the outer conductor of the coaxial radiator is stripped off at a suitable length, and the total length of a dipole is considered for its resonance at a desired frequency of 2 GHz. The experiment has been conducted. The results show the return loss of -27 dB and the maximum gain of 9 dBi in the normal direction to the conductor plane. The computational results are also obtained, which agree well with the experimental results.