降低射频同轴电缆组件电压驻波比的方法

为解决由于射频同轴电缆组件电压驻波比大引起的放大器自激问题,对影响电缆组件电压驻波比的因素进行了分析。通过电缆组件电压驻波比的计算公式,阐述了电缆剥头尺寸和组件焊接方法在电缆组件装接过程中的重要性,提出了降低组件电压驻波比的方法。通过对电缆剥头尺寸、组件焊接和测试方法的改进,降低了驻波比。经实际测试和应用,组件满足使用要求,消除了自激现象。     

组装方法对微波模块VSWR的影响

电压驻波比(VSWR)作为检测微波组件最重要的指标之一,是电路设计与制造水平的综合反映,其数值的高低决定了产品的质量。微波电路作为分布参数电路而言,信号的波长远远大于电路的微带线长。信号线上入射波与反射波相互作用形成了驻波。电压驻波比是传输线上最大电压与最小电压的比值,反映了在不同条件下反射回源端的信号能量。微波组件的VSWR主要受器件参数、器件间的级联匹配和装配工艺等因素影响。文中选取了微波组件装配工艺过程中影响电压驻波比的三大主要因素:接地效果、装配间隙、互连工艺,进行系列试验,通过理论分析和对试验结果的比较分析,我们得到实现较好电压驻波比性能所需的最佳微波组件的组装方法。     

影响物理发泡聚乙烯绝缘射频同轴电缆电压驻波比的因素分析

本文对影响物理发泡聚乙烯绝缘射频同轴电缆电压驻波比的主要因素做了分析和比较,结合生产实际,对分析结果做了验证。     

同轴电缆中的电压驻波比测量

使用显示器时,这种方法可以在0.5GHz 和电缆的80%上截止频率之间,测量配对的同轴连接器的电压驻波比。这种方法排除了同轴电缆残留电压驻波比的影响。     

影响物理发泡聚乙烯绝缘射频同轴电缆电压驻波比的因素分析

本文对影响物理发泡聚乙烯绝缘射频同轴电缆电压驻波比的主要因素做了分析和比较，结合生产实际，对分析结果做了验证。     

非标准波导-同轴电缆转换组件的研制

介绍了非标准波导-同轴电缆转换组件的设计及Ansoft HFSS仿真.详细阐述了将电缆内导体直接插入同轴谐振腔内进行调配,通过改变短路活塞在波导谐振腔内的位置和λ0/4同轴调谐器在同轴谐振腔内的位置,可实现小电压驻波比、低损耗、结构稳定可靠等优异的技术性能,并给出了实测数据,其主要技术性能优于俄罗斯同类产品的主要技术性能.     

辐射型漏泄同轴电缆电压驻波比影响因素分析

对辐射型漏泄同轴电缆电压驻波比影响的因素进行了分析,通过仿真及实际测试对分析元素进行了验证,探讨了在实际生产过程中对辐射型同轴电缆的电压驻波比的影响.     

正交试验对同轴电缆组件VSWR的优化

介绍了电压驻波比（VSWR）的计算方法。选取了电缆组件装配过程中影响电压驻波比的三大主要因素：内导体剥线尺寸、绝缘子剥线尺寸、内导体焊锡量,进行了正交试验,通过对试验结果的分析,得到实现较好电压驻波比性能所需的最佳电缆组件的生产条件。     

毫米波半柔软射频同轴电缆的研制

介绍了一种毫米波半柔软射频同轴电缆的结构设计与制造工艺。该电缆可传输毫米波射频信号,具有传输频率高(40GHz)、插入损耗小、弯曲成型能力强等性能特点。微孔聚四氟乙烯绝缘和导电金属层+镀锡铜线编织+热浸锡整体外导体结构是该电缆的主要创新点。     

新一代宽带移动优化E1/T1微小同轴电缆的研制

介绍了新一代宽带移动优化E1/T1微小同轴电缆的功能,从电缆结构设计、材料选择、制造工艺、性能检测等方面简述了新一代宽带移动优化E1/T1微小同轴电缆的研制。可以预期,新一代宽带移动优化E1/T1微小同轴电缆以其更高的使用频率、更低的电压驻波比、更稳定的传输性能等优点,将在未来的通信信息建设中起到重要的作用。     

A 4-, 6-, 20-, and 30-GHz-Band Branching Network Using a Multilayer Dielectric Filter for a Satellite Communication Earth Station

This paper describes a four-frequency broad-band branching network for transferring microwave (4 and 6 GHz)- and millimeter-wave (20 and 30 GHz)-band signals between an antenna and transmitter-receivers in a satellite communication earth station. A filter for separating the microwave band from the millimeter-wave band employs a multilayer dielectric filter with matching layers and is included in the primary antenna feed system. The design method used for the multilayer dielectric filter and the construction and experimental results of the four-frequency broad-band branching network are described. Measurements show that its insertion loss, VSWR, and axial ratio are less than 1.2, 1.2, and 2.1 dB, respectively.     

Millimeter wave twist reflector design aspects

A millimeter-wave twist reflector design procedure is described. An effective dielectric constant for capacitive susceptance correction for a unidirectional planar grating at the interface of free space and dielectric material in the twist reflector environment is introduced. The loss factor of the dielectric material is taken into account for the prediction of twist reflector performance. With the introduction of these corrections experimental results are found to be in close agreement with the theory. Normalized curves for the design of twist reflectors in terms of grating parameters, dielectric substrate relative permittivity, and dielectric material thickness are presented. Experimental results are given     

毫米波空间行波管输能结构的设计

本文采用分段设计的方法,将一个完整的盒型窗输出耦合结构分解为三部分,然后对这三部分分别进行匹配设计,最后将设计好的各部分组合成整体。利用HFSS软件对各段结构以及整体结构进行了仿真,结果表明这样设计出的盒型窗输出耦合结构在工作频带内可以很好的满足设计要求。     

宽频带GTEM传输室接头的优化设计

研制宽频带的吉赫横电磁波传输室,其高频输入接头的设计尤为关键.采用有限积分技术进行输入转接头的驻波比计算,利用软件建立仿真计算模型对内导体过渡段、介质垫片结构和圆形到方形处的结构进行优化,从而解决高频输入转接头的设计制作难题,保证了吉赫横电磁波传输室的整体性能.测试结果表明,采用此接头研制的传榆室工作频率上限达18GHz,电压驻波比小于1.5.     

基于BGA互联的毫米波模块三维集成设计

设计了一种利用微波基板作为转接板的毫米波系统级封装（System in Package,SIP）模块。采用球栅阵列(Ball Grid Array,BGA)作为射频信号层间垂直互联传输和隔离结构,实现了三维集成毫米波模块的低损耗垂直传输。对样件测试结果显示,在28~31 GHz频率范围之间,其端口驻波小于1.5,增益大于30 dB。该三维集成结构简单,射频传输性能良好,其体积仅为传统二维平面封装结构的20%,实现了模块的小型化,可广泛用于微波和毫米波电路与系统。     

平面带隙结构在微波和毫米波集成电路中的应用

介绍了平面带隙结构在微波集成电路应用方面的最新进展。光子带隙(PBG)结构是具有带阻特性的周期结构,最初应用于光学领域,后来扩展到其他领域。目前从可见光到红外都有研究,在微波和毫米波频段也有应用。PBG结构可以采用金属、介质、铁磁或铁电物质植入衬底材料,或者直接由各种材料周期性排列而成。目前国内外所提出的光子带隙结构多种多样,一维和二维的平面带隙结构由于易于实现且便于集成,因而在微波毫米波集成电路中得到了广泛的应用。     

Analysis of a Chiral Dielectric Supported Broadband Helix Slow-Wave Structure for Millimeter-Wave TWTs

A novel technique of broadbanding a helical slow-wave structure through negative dispersion shaping is proposed. The model considers a simple continuous chiral dielectric support for the helix inside a metallic barrel, unlike conventional helix slow-wave structures with three discrete dielectric supports at 120⁰ apart. The dispersion relation of the slow-wave structure was derived following sheath-helix abstraction, suitably benchmarked for special cases, and was used for analyzing the dispersion behavior of a typical slow-wave structure. Chiral dielectric loading could easily provide negative dispersion characteristics (required for broadband operation) by merely controlling the chirality parameter alone. The scheme with its simple geometric configuration is expected to be useful for millimeter-wave devices providing better thermal management.     

High performance microshield line components

Several millimeter-wave passive components have been fabricated using the microshield transmission line geometry, and their performance is presented herein. Microshield is a quasi-planar, half-shielded design which uses a thin dielectric membrane (1.5 μm) to support the conducting lines. This approach provides a nearly homogeneous, air-filled environment and thus allows extremely broad-band TEM operation. This paper examines the conductor loss and effective dielectric constant of microshield lines and presents results on transitions to conventional coplanar waveguide, right-angle bends, different stub configurations, and lowpass and bandpass filters. Experimental data is provided along with numerical results derived from an integral equation method. The microshield line is shown to be very suitable for high performance millimeter and submillimeter-wave applications     

Design of Dielectric Grating Antennas for Millimeter-Wave Applications

At theoretical procedure well suited for generating design data on dielectric grating antennas for the millimeter-wave region is presented. The procedure utilizes the effective dielectric constant (EDC) method to determine the phase constant of the leaky modes supported by the antenna structure of finite lateral width. The radiation or leakage constant of these modes is obtained from the relatively simple boundary value problem of dielectric grating antennas of infinite width. For single-beam radiation, the practicably interesting case, the phase and leakage constants completely determine the field distribution in the antenna aperture, from which the directivity gain and radiation pattern are then calculated. The dependence of the antenna characteristics on the dimensions of the radiating structure is presented and discussed for epsilon = 12, the dielectric constant of typical millimeter-wave materials, such as silicon and GaAs.     

Bandpass and Pseudo-High-Pass Quasi-Optical Filters

Two forms of quasi-optical filters are discussed herein for use at millimeter-wave frequencies and possibly for far infrared frequencies. One form consists of metallic grids with intervening dielectric support material which forms a quasi-optical filter analogous to the inductively coupled waveguide bandpass filter. Because of dielectric losses, the relatively weak upper stopband, and the rapidly repeating passbands, this type of structure leaves much to be desired as a bandpass quasi-optical filter. However, when designed for wide bandwidth, it makes a very good pseudo-high-pass filter. For moderate- to wide-band bandpass applications, pseudo-high-pass filters of this type can be designed to match with a form of quasi-optical low-pass filter previously treated by the authors, in order to give a bandpass filter with strong, broad stopbands on both sides of the passband. Design principles, computed performance, and experimental results are presented for both pseudo-high-pass and bandpass structures.