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SPACE-WAVE CHARACTERISTICS OF MILLIMETER-WAVE GUIDES AND DEVELOPMENT OF LEAKY-WAVE ANTENNAS WITH HIGH PERFORMANCE

毫米波波导的空波特性及高性能漏波天线的研制

基本信息

批准号：
13650439
负责人：
TSUJI Mikio
金额：
$ 2.24万
依托单位：
DOSHISHA UNIVERSITY
依托单位国家：
日本
项目类别：
Grant-in-Aid for Scientific Research (C)
财政年份：
2001
资助国家：
日本
起止时间：
2001 至 2004
项目状态：
已结题

项目摘要

The development of leaky millimeter-wave antennas, which is constructed by a metal waveguide or a planar-circuit transmission line, especially a stub-loaded ridge-rectangular waveguide, has been investigated. For designing antennas, we should analyze accurately the leakage properties of the stub-loaded waveguide and so we have first developed an improved mode-matching method suitable to the analysis of the present waveguie that has many singular-field edges. Then the dependence of the structural parameters on the leakage is calculated and a design method for high-performance antennas with low-sidelobe radiation is established. As a design example, an antenna with the Taylor distribution of -30dB sidelobe level has been designed and fabricated. The measurement of its radiation pattern fully proves the effectiveness of the present antenna. But, the FDTD analysis shows that the higher-order channel-guide leaky mode is a little bit excited, together with the desired leaky mode in the propo … More sed guide structure. This fact is not so serious from the viewpoint of the radiation pattern, but is important from the viewpoint of the excitation efficiency.Therefore the structure of the stub-loaded waveguide has been improved, of which the stub portion is installed into the ridge portion. As a result, the single-mode operation has been realized in the improved guide. The design method for a low-sidelobe antenna based on this improved guide has been again established and its effectiveness has been verified experimentally, too. Finally, the array antenna including a feeding circuit has been designed and fabricated. The measured results confirm the usefulness of the array antenna. These results provide the possibility for using the present leaky-wave antenna practically.While as for planar-circuit transmission lines, it is concluded that introducing lateral conductor walls as well as an air layer between the ground plane and the dielectric substrate is very useful for a high-performance leaky-wave antenna. Less

研究了以金属波导或平面电路传输线构成的漏毫米波天线的发展，特别是以短桩加载脊矩形波导为主的漏毫米波天线。在天线设计中，我们需要准确地分析桩载波导的泄漏特性，因此我们首先开发了一种改进的模式匹配方法，适用于分析目前具有许多奇异场边缘的波导。在此基础上，计算了结构参数对漏损的依赖关系，建立了高性能低旁瓣辐射天线的设计方法。作为设计实例，设计并制作了副瓣电平为-30dB的泰勒分布天线。对其辐射方向图的测量充分证明了该天线的有效性。但是，时域有限差分分析表明，高阶通道波导的漏模受到了一定的激发，并且在高阶通道波导结构中存在期望的漏模。从辐射方向图的角度来看，这一事实并不严重，但从激发效率的角度来看，这一事实很重要。因此，改进了存根加载波导的结构，将存根部分安装在脊部中。结果表明，改进后的导轨实现了单模工作。在此基础上重新建立了低旁瓣天线的设计方法，并对其有效性进行了实验验证。最后，设计并制作了包含馈电电路的阵列天线。实测结果证实了阵列天线的有效性。这些结果为漏波天线的实际应用提供了可能。而对于平面电路传输线，在地平面和介质基板之间引入横向导体壁和空气层对于高性能漏波天线是非常有用的。少