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Developmental Study of Cavity-Backed Slot Antennas Consisting of Two Conductive Plates Separated by Wires

两块导线隔开的导电板背腔缝隙天线的研制

基本信息

批准号：
12650357
负责人：
OMIYA Manabu
金额：
$ 2.3万
依托单位：
HOKKAIDO UNIVERSITY
依托单位国家：
日本
项目类别：
Grant-in-Aid for Scientific Research (C)
财政年份：
2000
资助国家：
日本
起止时间：
2000 至 2002
项目状态：
已结题

来源：
https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-12650357/
关键词：
cavity slot antenna phased-array antenna solar power satellite energy transmission antenna microwave energy transmission wireless power transmission FDTD analysis method 素子間相互結合

项目摘要

The cavity-backed slot antenna is used as a microwave energy transmission antenna element for solar power satellites. The antenna element has advantags over other types of antenna in mechanical strength, heat dissipation and a low profile structure. We propose new types of cavity-backed slot antenna consisting of two conductive plates separated by thin wires or thick pillars.First we show an effective design method of an antenna element with the height of 3 mm excited by the short-ended probe and derived two kinds of antenna parameter for the element with finite and infinite conductive plates, respectively. Both realize a good impedance matching at the frequency of 2.45 GHz. It is clarified from calculations that the antenna parameters are effective for the array antenna design and that the mutual coupling between the excited element and its adjacent ones in the direction of H-plane is considerably large. Additional calculations for the nine-element and the twenty-five-element array antennas show that quantities of return loss and mutual couplings are almost the same for both array geometries. So the evaluation of mutual coupling for the nine-element array antenna gives us good perspectives of that in the large-scale array antenna.Second, we discussed another type of antenna element excited by an inverted-F element. The elements are composed of the two conductive plates separated by the eight square pillars of 12 mm high. If we use metal pipes as the pillars, we can realize an easy method to configure the element as the two conductive plates are fixed with screws. Furthermore, the antenna configuration has advantages such that the feeder is set on the bottom conductive plate and is not connected with the upper plate. This type of element is configured with fewer posts than the previous one.

背腔缝隙天线是太阳能卫星微波能量传输天线单元。该天线元件在机械强度、散热和低轮廓结构方面优于其它类型的天线。本文提出了一种新型背腔缝隙天线，它由两个由细线或粗柱隔开的导电板组成，首先给出了一种由短端探针激励的高度为3mm的天线单元的有效设计方法，并分别推导了有限和无限导电板单元的天线参数。在2.45 GHz的频率下，两者都实现了良好的阻抗匹配。计算表明，天线参数对阵列天线设计是有效的，激励单元与相邻单元在H面方向上的互耦是相当大的。对9单元和25单元阵列天线的附加计算表明，两种阵列几何形状的回波损耗和互耦量几乎相同。因此，对九单元阵列天线互耦特性的研究，为大规模阵列天线互耦特性的研究提供了很好的前景。其次，我们讨论了另一种由倒F单元激励的天线单元。该元件由两个导电板组成，由八个12 mm高的方形柱隔开。如果我们使用金属管作为支柱，我们可以实现一种简单的方法来配置元件，因为两个导电板用螺钉固定。此外，该天线配置具有优点，使得馈线设置在底部导电板上并且不与上板连接。这种类型的元素配置有比前一个更少的柱。