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Fundamental Studies on Integrated Antennas

集成天线的基础研究

基本信息

批准号：
62420033
负责人：
ITOH Kiyohiko
金额：
$ 21.31万
依托单位：
Hokkaido University
依托单位国家：
日本
项目类别：
Grant-in-Aid for General Scientific Research (A)
财政年份：
1987
资助国家：
日本
起止时间：
1987 至 1990
项目状态：
已结题

项目摘要

We have investigated (1) excitation of integrated antennas and their radiation properties, (2) highーresolution timeーdomain measurements and (3) multipath suppression in mobile communications.The principal results are as follows :1. The integrated antennas have multiーlayed structure of radiation elements and feeders including active circuits. The radiation elements are excited through a small aperture by electroーmagnetic coupling. We have formulated analysis of the antennas using a spectral domain moment method. We carried out numerical calculations and fundamental experiments for several models, and showed their input and radiation properties. Also, we showed behavior of a parallelーplate wave guide mode and conditions of suppression of it.2. Timeーdomain measurements are useful and attractive for electromagnetic devices. However, a conventional method using an FFT (Fast Fourier Transform) requires broad bandwidth frequency data to obtain high resolution in a time domain. Namely, the FFT is not adequate for narrow bandwidth devices such as antennas. We have proposed the time-domain measurements using a MUSIC Algorithm. Furthermore, we investigated fundamental properties and applications of the algorithm. It was shown that the frequency bandwidth required by the MUSIC Algorithm to resolve distinct time-domain responses is much narrower than that by the FFT.3. Frequency-selective fading due to a multipath signal is one of the most serious hindrance in high-speed digital mobile communications. We have proposed to suppress the multipath signal using an adaptive antenna. We carried out computer simulations and showed that the adaptive antenna is useful in high-speed digital communications. Also, we proposed a method to generate a reference signal in the adaptive antenna and an advanced processing technique using a diversity scheme.

本文研究了（1）集成天线的激励及其辐射特性，（2）高分辨时域测量和（3）移动的通信中的多径抑制问题，主要结果如下：1.该集成天线具有辐射单元和包括有源电路的馈线的多层结构。辐射元件通过一个小孔由电磁耦合激励。我们制定了分析的天线使用谱域矩量法。我们对几种模型进行了数值计算和基础实验，给出了它们的输入和辐射特性。并给出了平行四边形平板波导模式的行为和抑制条件.时域测量对于电磁器件是有用且有吸引力的。然而，使用FFT（快速傅立叶变换）的传统方法需要宽带频率数据以获得时域中的高分辨率。也就是说，FFT不适用于窄带宽设备，如天线。我们提出了使用MUSIC算法的时域测量。此外，我们研究了算法的基本性质和应用。结果表明，MUSIC算法所需的频率带宽，以解决不同的时域响应是窄得多的FFT。多径信号引起的频率选择性衰落是高速数字移动的通信中最严重的障碍之一。我们已经提出了使用自适应天线来抑制多径信号。我们进行了计算机模拟，并表明自适应天线是有用的高速数字通信。此外，我们提出了一种方法来产生一个参考信号的自适应天线和先进的处理技术，使用分集方案。