Development of Antenna System Technologies Useful for Millimeter-Wave Wireless Local Area Networks

本课题组取得了以下成果，为毫米波无线局域网系统的发展做出了重要贡献。作为毫米波平面扇形天线的基本单元，研制了一种后向激励的印刷缝隙阵列。提出了一种利用该阵列构造平面型扇形天线的新结构。通过数值计算和实验验证了所提方法的有效性。提出了一种印制缝隙八木UDA阵列，并研究了用该阵列制作的平面型扇形天线。利用谱域矩方法对扇形天线进行了分析，验证了所研究天线的有效性能。提出了一种带后壁腔的印制缝隙八木阵列。对该阵列进行了FDTD分析，得到了该阵列的设计准则。制作了由该阵列构成的平面扇形天线，并进行了测试。测量结果表明，在天线上不设置金属屏蔽墙，相邻阵列之间的相互作用可以忽略不计。制作了一种由磁环天线组成的准光天线混频阵列，并对其进行了测试。提出了一种新型的由准光天线混频器组成的二维阵列系统，并从理论上揭示了其接收特性。在10 GHz频段获得的测量结果证实了该方案的有效性能。提出了一种基于图像NRD导轨的毫米波天线和电路。研制了一种谐振型漏波天线，实现了宽边辐射和低副瓣电平。研究了一种由像NRD波导构成的介质棒天线。此外，还提出了一种从像NRD波导到矩形波导的转换方法，并在30 GHz频段进行了实验验证。

Our research group obtained the following results that contribute greatly to the development of millimeter-wave wireless local area network systems.1. As a basic element of millimeter-wave planar-type sector antennas, a printed slot array with backward excitation was developed. A novel configuration for constructing a planar-type sector antenna using this array was also proposed. The effectiveness of the proposed techniques has been confirmed with numerical and experimental manner.2. A printed slot Yagi-Uda array was proposed, and a planar-type sector antenna made by this array was investigated. Analysis of the sector-antenna based on spectral domain moment method was carried out to confirm the effective performance of the investigated antenna.3. A printed slot Yagi-Uda array with post-wall cavity was proposed. FDTD analysis on this array was carried out to obtain the design guideline. A planar-tyep sector antenna composed of this array was fabricated and measured. From the measured results, it is revealed that the interaction effect between the adjacement arrays can be ignored without arranging metal shielding walls on the antenna.4. A quasi-optical antenna mixer array composed of a magnetic loop antenna was fabricated and measured. A novel 2-dimensional array system consisting of the quasi-optical antenna mixer was proposed, and its receiving characteristics were revealed theoretically. Measured results obtained at 10GHz band confirmed the effective performance of the proposal.5. Millimeter-wave antennas and circuits based on an image NRD guide were proposed. A resonant-type leaky wave antenna, realizing the broadside radiation and low sidelobe level, was developed. A dielectric rod antenna constructed from the image NRD guide was investigated. In addition, a transition from the image NRD guide to a rectangular waveguide was also proposed and its effective performance was demonstrated with experiments at 30GHz band.