毫米波波导设计分析

在行波管整管性能中,波导与慢波结构的阻抗匹配过渡波导结构的S参数满足设计要求.采用两节腔慢波结构加载波导,模拟分析了无电子注作用时高频波的传输特性,分析得到引起衰减的主要因素并判定输入/输出波导与慢波结构的阻抗匹配状态良好.     

一种结构紧凑的毫米波波导滤波器的设计

提出了一种新颖的毫米波波导滤波器的设计方法,以常用的H面膜片波导滤波器为基础,配合并不常用的基于磁耦合原理的波导同轴转换,从波导短路端面引入E面耦合环,使输入输出方向在一条直线上,并将两者做一体化设计,在保证良好性能指标的情况下,结构设计更为紧凑,体积更小。该设计保证了在星载或机载设备上空间结构受限的情况下,器件安装与电缆连接的便利。借助HFSS全波电磁场仿真,成功地运用在中心频率30GHz毫米波波导带通滤波器的设计上,使设计方法更为简便实用。     

Millimeter Wave Substrate Integrated Waveguide Antennas: Design and Fabrication Analysis

The paper presents a new concept in antenna design, whereby a photo-imageable thick-film process is used to integrate a waveguide antenna within a multilayer structure. This has yielded a very compact, high performance antenna working at high millimeter-wave (mm-wave) frequencies, with a high degree of repeatability and reliability in antenna construction. Theoretical and experimental results for 70 GHz mm-wave integrated antennas, fabricated using the new technique, are presented. The antennas were formed from miniature slotted waveguide arrays using up to 18 layers of photo-imageable material. To enhance the electrical performance a novel folded waveguide array was also investigated. The fabrication process is analyzed in detail and the critical issues involved in the fabrication cycle are discussed. The losses in the substrate integrated waveguide have been calculated. The performance of the new integrated antenna is compared to conventional metallic, air-filled waveguide antennas, and also to conventional microstrip antenna arrays operating at the same frequencies.      

一种大功率宽带毫米波波导滤波器

介绍了一种毫米波频段的大功率波导滤波器,综合出其四阶耦合矩阵,采用矩形波导膜片方案仿真设计,得到了中心插损小于0.3dB 的宽带波导滤波器。并对该滤波器在常压和真空环境下所能承受的功率进行了分析,试验结果表明该滤波器具有尺寸小,便于加工调试,可用于星载大功率环境的优点。     

毫米波宽带波导功率合成器设计

毫米波宽带功率放大器是毫米波电子对抗系统的关键部件之一,宽带低损耗的波导合成器是实现毫米波宽带大功率合成放大器的关键。根据设计目标,分析比较了四端口波导合路器和无耗三端口波导合路器的优缺点,提出了毫米波宽带波导合成器的设计方案,用电磁场仿真软件HFSS对宽带波导功率合成器进行了建模和设计仿真,并制作了工作频率范围在26~40 GHz的功率合成器,对测试指标和仿真曲线进行了对比分析。实际测试结果表明,设计的波导合路器具有良好的工程实用价值。     

毫米波多分区单脉冲波导缝隙阵天线的设计

设计了一种毫米波多分区单脉冲缝隙阵天线。通过多分区拓展了天线的驻波带宽,通过阵面近场分布优化 来消除分区短路板对方向图的影响,实现了超低副瓣。设计了一个28*28 的圆口径单脉冲缝隙阵天线,仿真结果表明天 线驻波带宽600MHz(VSWR<1.3),副瓣电平中心频率-34.9dB,带宽内-30dB。     

毫米波双通带基片集成波导滤波器设计

提出了一种新型毫米波双通带基片集成波导(SIW)滤波器,该滤波器由双模基片集成波导和双模带线谐振器构成。其中双模带线谐振器嵌入到双模基片集成波导谐振腔中,不占据额外的电路面积,利用双模带线谐振器的TEM模和双模基片集成波导谐振腔的两个简并模式TE102、TE201,可分别形成两个相互独立的通带,因此该滤波器的设计具有很大的灵活性。所设计的双通带滤波器具有三个传输零点,实现了良好的带外抑制和带间隔离度。该双通带滤波器工作于28.4GHz和32.2GHz,3dB带宽分别为2%和3%。最终的测试结果和仿真结果相吻合,证明了该设计方法的可靠性。     

毫米波波导成型技术

用活动模芯代替钢带是毫米波波导弯曲成型的有效方法,该工艺的关键是模芯的设计与制造。采用活动模芯弯曲毫米波波导,重点讨论了模芯尺寸、模芯形状和回跳角对波导尺寸和表面粗糙度的影响,并对该工艺制备的样品进行了测定。结果表明:当模芯尺寸与波导内腔实际尺寸差值在0~0.02 mm,不同的弯曲半径和弯曲角度给予不同的回跳角预设值,可以制造出满足设计要求的弯波导。     

毫米波耦合腔行波管过渡波导的设计

利用电磁场分析软件，研究了用于毫米波耦合腔行波管的两种过渡波导，分析比较了各种结构的宽带匹配性能，给出的部分结果可以直接在整管设计中采用。     

Design of Millimeter Wave Wideband Transition From Double-ridge Waveguide to Coaxial Line

In this paper, an improved design method of millimeter wave wideband transition from double-ridge waveguide to coaxial line is introduced. The proposed design is based on the mode conversion theories and impedance matching techniques. The characteristics of the transition in microwave frequencies are analyzed and simulated by full-wave analysis software. According to the simulated results, a couple of transitions are fabricated. The predicted superduper performances have been confirmed experimentally in a wide frequency range of 18 ~ 40 GHz.     

毫米波成像前端中H面电感膜片波导带通滤波器的精确设计

在H面电感膜片波导带通滤波器的设计中,考虑到加工产生倒角及其产生的频率偏移,总结出带倒角膜片滤波器的精确设计方法,并给出了修正公式。为了验证本文提出的设计方法,利用HFSS对具有不同的中心频率、不同的3 dB带宽(BW)和不同的倒角半径下对这种滤波器进行了仿真,其中心频率分别为18 GHz,26 GHz,34 GHz和42 GHz,对应的带宽对应为2.265%,2.5%,10%,15%和20%,仿真结果表现出了规律性偏移趋势。通过对中心频率和带宽分别为26 GHz、2.5%和34 GHz、2.265%的2种H面波导滤波器进行实测,测试结果与利用修正公式的仿真结果一致。     

The Groove Guide, a Low-Loss Waveguide for Millimeter Waves

A new waveguide for the low-loss transmission of millimeter waves is presented. The guide consists of two parallel conducting walls with grooves in the central region of the guide cross section. The grooves run along the guide in the direction of the wave propagation. It is shown that the waveguide, if excited in the TE-wave mode, has properties similar to those of the H guide, which contains a dielectric slab between the conducting walls in the center. The new guide is characterized by an exponential transverse decrease of the field distributions in direction from the center and by low attenuation. Theoretical considerations dealing with the field distribution and the data of the guide are presented.     

Random Discrete Imperfections in Millimeter Waveguide Systems

A method has been developed to compute the increase of attenuation due to imperfections of finite length randomly distributed in a link. As a limit for the vanishing length the formulas yield the result for random discontinuities. The approach is quite general and can apply to a circular waveguide link as well as to other cases, where the statistics of the problem are described by the power spectrum of the deformation. The applications presented here show how random spacing of the deformations causes significant modifications on the attenuation results; as a particular case some expressions are found to be in agreement with others previously derived. The results are interesting in determining what random variation in the waveguide lengths is sufficient to avoid a serious frequency dependent effect in the attenuation characteristic of a circular waveguide link.     

A New Leaky Waveguide for Millimeter Waves Using Nonradiative Dielectric (NRD) Waveguide-Part I: Accurate Theory

An almost-rigorous analysis is presented for a new leaky waveguide of simple configuration based on a recent nonradiative modification of H guide suitable for millimeter wavelengths, The analysis employs a transverse equivalent network that yields a dispersion relation in closed form, and contains some interesting and subtle features. Numerical values are presented for the phase and leakage constants in terms of the different geometric parameters and the dielectric constant comparisons with measurements are made in the companion paper, part II.     

波导微波泄漏检测系统的设计及实现

介绍了波导微波泄漏检测系统的原理，并对其中的幅度测量单元、显控单元的组成和实现作了详细的阐述。     

A Range of 2 and 1 Millimeter Waveguide Components

A variety of components have been made in wave-guides RG136 and RG139 by techniques which include the use of extruded waveguide, copper-gold eutectic bonding, precision milling and, in particular, of electroforming. Performances of several RG136 components are given, together with the loss in RG139 waveguide and in oversized guide tapered from RG139. Ferrite devices, including isolators, 3 port switches and amplitude modulators, using Ferramic R1, have been quite successful. A typical isolator has an insertion loss of 1 1/4 db and an isolation of 30 db, magnetically tunable over at least 133 to 145 Gc. An RG136 slotted line, at a coupling ratio of 20 db, has an inherent mismatch of 1.05 with good reproducibility over the 2 1/2 wavelengths traverse of the one-mil Wollaston wire probe. The main waveguide is milled and broached from brass and gold plated. Electroformed matched hybrid tees in RG136 split power to /spl plusmn/ 1/4 db, have a discrimination of 30 db, a loss of 1 1/4 db and a match looking into any arm of better than 1.4. Rotary and flap-type attenuators, phase shifters, variable short circuits, matching units, crystal diodes and their mounts, bolometers and dry calorimeters, etc., have been made, and for transmission over moderate distances the vastly overmoded TE/sub 01/ waveguide was used.     

Hollow-Cylinder Waveguide Isolators for Use at Millimeter Wavelengths

The device considered in this study is a semiconductor waveguide isolator consisting of a hollow column of a semiconductor mounted coaxially in a circular waveguide in a longitudinal dc magnetic field. An elementary and physical analysis based on the excitation of plane waves in the guide and a more rigorous mode-matching analysis (MMA) are presented. These theoretical predictions are compared with experimental results for an InSb isolator at 94 GHz and 7.5 K.     

一种新型毫米波集成波导微带转换的分析与设计

提出一种新型集成于单层微带基片的毫米波集成波导微带转换 ,由一圆形微带谐振器、微带共面波导探针组成。利用全波分析软件对该转换器进行了分析计算、优化设计。测试了波导微带转换实物 ,结果表明 ,在Ka波段在 1 GHz频带内 ,该波导微带转换具有较低的插入损耗 ( <0 .4d B)和反射损耗 ( <-1 4d B)。可满足相关毫米波微带集成电路系统的应用要求。     

Field Theory Design of Square Waveguide Iris Polarizers

Profiled depth corrugated square waveguide polarizers are designed with the method of field expansion into eigenmodes, which includes higher order mode interaction between the step discontinuities. Computer-optimized design data are giyen for a compact Ku-band prototype with an exponentially varying depth function that achieves 90° +- 1° differential phase shift shift within the separate 11.9-12.3-GHz and 17.5-17.9-GHz frequency bands. The maximum VSWR is only about 1.02. Further design examples include a linearly profiled depth function, which provides a short design, and a polarizer with iris thicknesses suitable for metal-etching manufacturing technique. The theory is verified by comparison with available measured results.