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首页> 外文期刊>Antennas and Propagation, IEEE Transactions on >Vertically Multilayer-Stacked Yagi Antenna With Single and Dual Polarizations
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Vertically Multilayer-Stacked Yagi Antenna With Single and Dual Polarizations

机译：具有单极化和双极化的垂直多层堆叠八木天线

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摘要

There are many applications such as local positioning systems (LPS) and wireless sensor networks that require high-directivity and compact-size or small footprint antennas. The classical Yagi-Uda antenna may be useful in meeting such demands, which however, becomes very large in size to achieve a high-gain performance due to a large number of directors as well as space required between those elements. In this paper, high-gain yet compact stacked multilayered Yagi antennas are proposed and demonstrated at 5.8 GHz for LPS applications. This structure makes use of vertically stacked Yagi-like parasitic director elements that allow easily obtaining a simulated gain of 12 dB. Two different antenna configurations are presented, one based on dipole geometry for single polarization, and the other on a circular patch to achieve dual polarization. The characteristics of these antennas with respect to various geometrical parameters are studied in order to obtain the desired performance. Measured results of the fabricated antenna prototypes are in good agreement with simulated results. The measured dipole Yagi antenna yields 11 dB gain over 14% bandwidth with a size of $80times 80times 29 {rm mm}^{3}$. Radiation patterns of the dual-polarized Yagi antenna are nearly identical to those of the single-polarized antenna, which has a size of $50times 50times 60 {rm mm}^{3}$, and also its two-port isolation is found to be as low as $-$ 25 dB over 4% bandwidth. The proposed antennas present an excellent candidate for compact and low-cost microwave and millimeter-wave integrated systems that require fixed or variable polarization capabilities and small surface footprint.
机译：诸如本地定位系统（LPS）和无线传感器网络之类的许多应用需要高方向性，紧凑型或小尺寸天线。传统的八木宇田天线可能有助于满足此类要求，但是由于指向矢数量巨大以及这些元素之间需要的空间，其尺寸变得非常大，以实现高增益性能。在本文中，针对LPS应用，提出并在5.8 GHz频率上演示了高增益而紧凑的堆叠式八木八木天线。这种结构利用了垂直堆叠的类似八木的寄生指向矢元件，可以轻松获得12 dB的模拟增益。提出了两种不同的天线配置，一种基于偶极子几何结构用于单极化，另一种基于圆形贴片以实现双极化。为了获得所需的性能，研究了这些天线相对于各种几何参数的特性。制成的天线原型的测量结果与模拟结果非常吻合。测得的偶极八木天线在14％的带宽上产生11 dB的增益，其尺寸为$ 80×80×29 {rm mm} ^ {3} $。双极化八木天线的辐射方向图与单极化天线的辐射方向图几乎相同，后者的尺寸为50乘以50乘以60 {rm mm} ^ {3} $，并且发现其两端口隔离可以在4％的带宽上低至$-$ 25 dB。拟议中的天线为紧凑，低成本的微波和毫米波集成系统提供了极好的选择，这些系统需要固定或可变的极化能力以及较小的表面覆盖面积。

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