Abstract:Presented is a simplified CAD technique for millimeter wave diplexer with E-plane circuits, which includes the equivalent circuit of E-T junction, analysis and optimization of S matrix for the diplexer. The test at V band shows that the results of design by this technique agree wed with the design requirements.

Abstract:A concept of the extremely short-range radar is presented. The formula of the operating distance is derived and a novel Doppler-based extremely short-range radar in the 3 millimeter wave band was developed. The result of test indicates that the radar has the advantages of simple structure, low cost and high accuracy in the range determination within the distance from less than one meter to several meters.

Abstract:A description is given of the development of new geometries for resonant tunneling devices involving tunneling through coupled quantum well states in a variably spaced superlattice energy filter (VSSEF). Resonant tunneling through high energy states in AlAs/GaAs VSSEF devices and excited states in AlGaAs/GaAs superlattices are demonstrated and their application to higher power microwave sources and resonant tunneling transistor described. Potential applications of resonant tunneling structures to optical devices such as avalanche detectors and infrared emitters are discussed.

Abstract:A new high order edge element approach is discussed. This method not only elimiflates the spurious solutions but also possesses the characteristics of simplicity and high efficiency. The emphasis is laid on the investigation of the space construction of the second-order edge-element approach and the related formulations are given.The computations of the eigenvalues of the dominant and the higher-order modes in the slab loaded waveguide show that the accuracy of the second-order edge-element approach is about one order higher than that of the first-order edge-element approach.The calculations of the dispersion curves for the dominant mode in the block dielectric loaded rectangular waveguide and in the microstrip line with anisotropic substrate verify the accuracy and the extensive suitability of the present method.

Abstract:The framework and technical specifications of a wideband coherent millimeter wave radar being newly developed in the Beijing Institute of Environmental Features, are introduced. The principle of high resolution imaging is reviewed. Four imaging algorithms are discussed and their performances compared. Experimental results of imaging on a model aircraft are presented.

Abstract:报道了一种使用介质谐振器稳频的高性能和高稳定的６ｍ全微带ＧａＡｓ耿氏振荡器．频率在４４．６ＧＨｚ时，输出功率为１０２ｍＷ；频率温度系数为４．８ｐｐｍ／℃．

Abstract:根据气体吸收理论和我国气象探空数据Ｐ－Ｔ－Ｕ剖面（即压强－温度－露点差剖面），给出了频率直到１００ＧＨｚ，低层大气复折射率在我国１０４个气象站的频率、时间和空间特性的计算结果．讨论了在５０～７０ＧＨｚ频率范围内，氧气吸收的压力展宽效应．根据无线电工程的需要，还对气体吸收产生的衰减和时延进行了计算．

Abstract:A new technique for diclectric measurement of double-layered dielectric samples using a quasi-optical resonator at millimeter wave bands is proposed. At 8 mm band. a set of quasi-optical resonator measurement system was set up, and a number of double layered dielectric samples were measured.

Abstract:提出一种在微波与毫米波段快速、精确地建立ＨＥＭＴ器件等效电路的新方法，并对ＨＥＭＴ器件的噪声模型及参数的提取方式进行了研究．给出了等效电路模型（２～６０ＧＨｚ）和噪声模型（２～２６ＧＨｚ）的数值结果．

Abstract:Two ways to develop vacuum micro-electronic devices (VMED) in the microwave and millimeter wave bands, i.e. the VME distributed amplifiers (VMEDA) and VME microwave tubes (VMEMT) are introduced. A brief review about the development of vacuum and solid state MM-wave devices, a discussion on the two kinds of VMED's merits and problems, and some ideas on developing mm-wave VMED in China are given.

Abstract:he gap discontinuity of the dielectric strip in the GNRD is analyzed transversely and longitudinally by employing the field-matching method. At first,the dispersion characteristics of the propagating mode and the evanescent mode are discussed, then the curves of reflectivity with respect to the gap are given. Finally, the theoretical and experimental data are compared, and they are in agreement with each other.

Abstract:用国产梁式引线混频二极管研制成功鳍线平衡混频器，在本振为６７ＧＨｚ，射频在６８～８０ＧＨｚ变动时，其变频损耗为８．６～１１ｄＢ．

Abstract:介绍一种研究毫米波酵母细胞生物效应的新装置．它应用锁相技术使输出频率保持长期的高度的稳定度（±１０ｋＨｚ），并配有确定场强分布（衰减变化达９位）的矩形辐照室，实现了对单个细胞场强作用的精确控制，并自动跟踪观察和记录了它们的生长参数．

Abstract:The working parameters of a third-order loop are deduced based on the analysis of a millimeter band digital phase-locked loop. A digital phase-locked 8 mm Gunn oscillator with a heterodyne-loop structure is designed. It is shown by the measurements that the performance of this loop is quite satisfactory. It has the characteristics of being easily locked and having a pure spectrum.