基于LTCC的Ka波段带通滤波器的设计

设计了一种基于低温共烧陶瓷技术带状线形式的Ka波段带通滤波器,该滤波器被埋入11层的基板中。提出一种类同轴结构来减小共面波导到带状线转换之间的阻抗不连续性。整个带状线滤波器采用了金属直通孔来实现接地和屏蔽功能。测试结果表明,滤波器中心频率为34.69GHz,带宽1.73GHz内最大插入损耗为-4.5dB,通带内回波损耗低于-13.45dB。该测试结果包含两个射频接头。整个滤波器尺寸为9.8mm×5mm×1.056mm。这种紧凑埋置式的结构和测试结果表明,该带状线滤波器适合于毫米波多芯片组件的应用。     

介质基片缝隙阵列天线设计

本文应用介质基片波导技术(SIW)实现了介质基片波导驻波缝隙阵的设计、多层微波电路的设计,带状线串馈功分器的设计以及带状线转同轴的设计.完成了实物的加工调试,测试结果与理论设计相符,验证了理论设计的正确性.     

一种新型的带状线功分器设计

本文主要对基于多层介质板的Wilkinson带状线功分器的设计方法进行了分析,并提出了一种新型的带状线功分器电路结构,其隔离电阻采用了表贴片式固定电阻的形式,通过微带线-带状线过渡电路实现功分器电路的带状线部分与隔离电阻及三个信号馈入馈出端口的连接。最后,本文使用三维电磁场仿真软件对一种X波段单节二路等功分功分器进行了参数建模、仿真计算,并对其加工制作,将测试结果进行了分析,证明了该型功分器性能良好,具有易与系统集成、工艺要求低、尺寸小巧等优点,在微波电路设计方面具有很高的实用价值。     

微波多芯片组件中垂直通孔互连的矩阵束矩量法仿真

在微波多芯片组件中,处在不同层的信号传输线是通过通孔连接在一起的。由于通孔会导致信号传输的不连续性,对信号的传输至关重要。本文采用矩阵束矩量法仿真了多层电路中通孔的散射特性,并总结了通孔几何尺寸和平行导体板间距变化时通孔的散射特性所表现出来的规律。     

基于遗传算法的多层布线有约束通孔优化

文章提出了一种采用遗传算法的多层布线有约束通孔优化算法。算法允许通孔打在任意两层之间, 并使得通孔不在它所穿过的层上与其它线网相交。通过在适应度函数中附加惩罚项, 算法将有约束优化问题转换为无约束优化问题。改进的对称型交配方式加快了算法的收敛速度。另外, 自然编码方式与期望值选择机制也提高了算法的执行效率。实验结果表明本算法不仅优化效果好, 而且收敛稳定和快速。     

微带线到共面波导的LTCC 宽带耦合互连过渡

在LTCC 多层电路结构中,不同形式的信号传输线之间往往采用垂直通孔互连,但由于互连通孔在高频时会 带来电感效应,且加工后会因变形而引入许多寄生参量,因此可选择耦合形式的互连过渡来实现不同传输线之间的互 连。本文针对微带线到共面波导,设计了一种可应用于LTCC 工艺的宽带耦合互连过渡结构,着重研究了耦合金属面 的宽度和耦合金属面侧边对地间隔对过渡结构频率特性的影响,并优化这些尺寸,得到了理想仿真结果：4.3GHz 到 12.7GHz 的频带内,回波损耗大于10dB,插入损耗最小到0.346dB,辐射损耗系数在小于12GHz 时,小于8.56%。     

毫米波LTCC组件中的波导-微带转换

介绍了Ka波段LTCC(低温共烧陶瓷)组件中矩形波导-微带的一种新型转换结构。这种转换结构通过波导和微带间的开槽耦合以及在LTCC多层布线基板中用金属填充通孔阵列等效替换波导壁而实现。此类型波导到微带的转换无需将安装在波导内的LTCC基板加工成特殊形状,便于加工,而且转换对LTCC基板和波导的机械安装公差要求较低。     

一种低剖面带状线结构的一体化阵列天线设计

基于阵列天线小型化的设计需求,设计了一种低剖面带状线结构的一体化阵列天线。天线采用带状线结构,利用两排均匀分布的金属化通孔充当带状线之间的金属隔离墙,并通过对双面印刷偶极子天线、馈电网络以及监测网络的一体化设计来实现的一款低剖面阵列天线。天线高度仅70 mm,满足在C波段18%的相对带宽内获得-28 dB的低副瓣性能。该一体化阵列天线具有结构紧凑、重量轻、可靠性强和监测功能等优点,便于和有源器件集成。同时,该天线满足实际使用要求,其设计思路和设计方法具有很好的可扩展性。     

小型化多层带线谐振腔缺陷地结构LTCC宽带带通滤波器

利用多层宽边耦合带状线谐振结构实现小型化LTCC(LowTemperature Co-fired Ceramic)宽带滤波器。采用了两层、三层耦合带线谐振结构,利用这两种谐振结构可以有效减小滤波器的尺寸。利用四个谐振腔结构,实现较宽的频带和较强的选择特性;输出、输入引入电感反馈产生两个传输零点,利用DGS(Defected Ground Struc-ture)可使滤波器在阻带和镜像频率处产生较大的衰减。设计出侧面印刷互连和侧面通孔互连两种工艺结构的滤波器,利用LTCC工艺加工出侧面印刷互连的滤波器性能良好,测试性能和仿真结果基本吻合。     

一种无通孔LTCC带通滤波器的设计与实现

基于低温共烧陶瓷(LTCC)技术,设计仿真了一种无通孔LTCC带通滤波器,该滤波器采用单层平行耦合微带线代替传统叠层电感,通过外部端电极互联各电路层,实现无通孔设计。根据仿真结果,采用LTCC工艺制备了0805封装尺寸的无通孔带通滤波器。结果表明:测量结果与仿真数据基本相符,滤波器中心频率为2.45 GHz。该滤波器适用于日益小型化的移动通信设备。     

Wideband coplanar stripline to double-sided parallel-strip line transition

A novel wideband transition between the coplanar stripline and the double-sided parallel-strip line is presented. The simple transition consists of two tapered lines, one located on the top layer and one tapered line on the bottom layer. Through the proposed transition, horizontally distributed electric fields of the coplanar stripline become rotated by 908 to match the vertically distributed fields of the double-sided parallel- strip line. Simulated and measured results of a back-to-back transition show good agreement.     

基于LGA工艺的D波段微带线－波导过渡结构

设计了一个工作于D波段的微带转波导结构。过渡结构由2部分组成,分别为微带－带状线过渡结构和带状线－波导过渡结构。相比传统的微带至波导结构,该结构无需额外的金属波导短路结构,减少了加工流程,直接和标准波导相连即可。仿真结果表明,在122~140 GHz范围内,反射系数小于-10 dB,最小插入损耗为1.85 dB。该过渡结构基于栅格阵列(LGA)封装工艺,能够直接与其他的芯片和无源器件进行集成和封装,对射频微系统的集成具有重要意义。     

Excitation of Waveguide by Stripline- and Microstrip-Line-Fed Slots

This paper presents investigations on coupling between stripline/microstrip line and a rectangular waveguide coupled through a slot in the ground plane which is fixed in the cross-sectional plane of the waveguide. A closed-form expression for the impedance loading on stripline/microstrip line is evaluated from knowledge of the complex power flowing down the rectangular waveguide supporting the dominant mode and discontinuity in the modal voltage in stripline/microstrip line. The reactance cancellation is obtained by terminating the stripline/microstrip tine exciting the slot in a short-circuited stub. The structure under this condition forms a transition between stripline/microstrip line and a waveguide. The design curves on slot length versus frequency are presented for different values of dielectric constants. The variation of coupling as a function of frequency and also the location of the slot is evaluated. Numerical results for slot coupling useful for the design of waveguide simulators are also presented.     

毫米波宽带二倍频器设计

基于鳍线/悬置微带线耦合器提出了一种适用于毫米波变容二极管的宽带平衡式二倍频器结构。鳍线作为二极管对的驱动输入端,同时提供直流偏置接地。二极管对的直流偏置电压由输出悬置微带/WR-22波导转换的探针馈入。结合宽带输入WR-42波导/鳍线转换、宽带鳍线/悬置微带线耦合器以及宽带悬置微带线/WR-22波导转换实现了覆盖整个Q频段的平衡式二倍频器。在输入功率为+20dBm,变容管反偏置电压1.2V时,输出33～50GHz的范围内倍频效率大于10%。     

New Coaxial-to-Stripline Transformers Using Rectangular Lines (Correspondence)

The most common form of coaxial-to-stripline transition consists of a simple inline butt joint, as described by Barrett. A typical transition between a 50-ohm high-Q triplate and a standard N-type connector is shown in Fig. 1. This gives a VSWR<1.15 at frequencies up to 7000 Mc deteriorating to 1.25 at higher frequencies up to 11,000 Mc. While these results are acceptable for many types of stripline components and assemblies, it was felt that the design of a better transition would be necessary in order both to test and to maintain the performance of high grade components (e.g., hybrids, directional couplers, and filters) and to avoid the manufacture of a special stripline standing-wave detector.     

一种新颖结构的宽带微带至共面带线转换器的设计

通过采用高频仿真软件IE3D Verion10.0对系统参数进行优化,设计了一种新颖结构的宽带微带至共面带线的转换器,并对其各部分结构进行了研究和比较,测得转换器在4.2GHz～18.2GHz的大频率范围内的插入损耗低于1dB,回波损耗大于10dB.     

Silica-waveguide thermooptic phase shifter with low powerconsumption and low lateral heat diffusion

A thermooptic (TO) phase shifter consisting of a thin film heater on the top of a loaded stripline silica waveguide on a silicon substrate is shown to exhibit faster time response than reported for phase shifters based on a buried silica waveguide configuration. The risetime was measured to be 0.24 ms, which is in good agreement with calculated thermal distributions in the structures. The lateral heat diffusion distance in the loaded stripline structure is shown to be smaller than in buried waveguide structures. This implies small thermal crosstalk and suggests a high-level integration of adjacent waveguides     

Wideband Hybrid Array Concept for Millimeter-wave Applications

The use of circular waveguide radiators electromagnetically coupled to a stripline distribution network is proposed in this work as wideband hybrid array configuration suitable for millimeter-wave applications. The adopted excitation mechanism avoids the use of transition components from stripline to radiators, which are responsible for loss mechanisms affecting similar configurations in literature. The effectiveness of the hybrid approach is first validated on a reduced frequency X-band prototype. Then, a Ka-band array design is presented and experimentally tested to prove the wideband radiation behavior. A radiation efficiency of about 60 percent is also demonstrated on the Ka-band prototype.     

A Broad-Band Model for a Coaxial-to-Stripline Transition

This paper investigates a significant source of error encountered when characterizing a circuit element embedded in a stripline circuit at microwave frequencies. The errors introduced by the coaxial-to-stripline transition are examined and a frequency-independent model is developed for the transition over the band 2-12 GHz. The usefulness of the model is demonstrated experimentally by measuring a known load consisting of a short length of high-impedance line terminated in a short circuit.