A Study on Millimeter-Wave Antenna Technology

(1)研制了一种新型准光天线混频器。天线混频器由共面波导馈电双频微带天线和连接到导端的肖特基势垒二极管组成。利用天线混频器实现了一种不使用移相器的新型波束扫描系统。(2)提出了一种用于毫米波波段的低损耗镜像NRD波导。研制了一种新型毫米波天线--iNRDG成像板上的横槽。为了设计横向缝隙阵列，提出了归一化阻抗的分析和测量方法。(3)提出了一种新的镜像介质波导的同轴馈电技术。此外，还研究了DIL和iNRDG之间的过渡。实验结果和FDTD分析结果验证了所提方案的有效性。(4)利用谱域矩方法研究了三板型缝隙耦合微带天线中平行板模式的行为。研究了一种新型的平行板模式抑制技术。(5)研制了一种新型的后向激励印刷缝隙阵列天线，作为毫米波无线局域网系统扇形天线的单元。研究了一种严格的阵列天线设计方法。在该技术中，使用了谱域矩方法。

(1) A novel quasi-optical antenna mixer has been developed. The antenna mixer consists of a coplanar waveguide fed dual-frequency microstrip antenna and Schottky-barrier diode connected to the end of the guide. A novel beam scanning system in which the phase shifter is not used has been realized using the antenna mixer.(2) An image NRD guide (iNRDG) has been proposed as a low-loss guide in the millimeter-wave band. A transverse slot cut on the image plate of the iNRDG has been developed as a novel millimeter-wave antenna. To design the array of the transverse slot, an analysis and a measurement method of the normalized impedance has been developed.(3) A novel coaxial feed technique of the image dielectric waveguide (DIL) has been proposed. In addition, a transition between DIL and iNRDG has been investigated. The validity of the proposals has been confirmed using experimental results and FDTD analysis.(4) Behavior of parallel plate mode in a triplate-type slot-coupled microstrip antenna has been clarified through the use of the spectral domain moment method. A novel suppression technique of the parallel plate mode has been also investigated.(5) A novel printed slot array antenna, in which a backward excitation is employed, has been developed as an element of sector antenna for millimeter-wave wireless LAN systems. A rigorous design technique of the array antenna has been investigated. In the technique, the spectral domain moment method is used.