半模基片集成波导平衡混频器的设计实现

利用半模基片集成波导3 dB电桥设计了一种X波段单平衡混频器,并用印刷电路板工艺实现。首先设计并测试了半模基片集成波导电桥的性能,并给出测试结果。然后将半模基片集成波导电桥用于单平衡混频器的设计,并给出混频器的具体电路形式。该混频器具有良好的性能,与原有的基片集成波导电桥混频器相比体积更小、重量更轻。经测量混频器变频损耗小于8.6 dB,并在9 GHz～12 GHz频带内获得了比较好的响应平坦度。     

半模基片集成波导增益均衡器的设计和实现

针对增益均衡器小型化的发展趋势和要求,设计了多子结构单元级联的Ku波段的半模基片集成增益均衡器.谐振子单元与主传输线在三层介质基板上,成空间立体分布,构成七层结构;提出了利用多节微带线枝节进行阻抗匹配的过渡带设计方法,根据坐标变换分析得到HMSIW谐振腔的主模;采用羟基铁填充的吸收柱阵列调节衰减量和Q值,给出了该结构均衡器的设计步骤.与微带均衡器相比,该均衡器提高了Q值,减小了损耗.测试结果表明,该结构保持了和腔体类均衡器相同的性能,同时缩小了体积,实测结果与目标均衡曲线吻合度较好,最大差值为0.6dB.行波管与均衡器联测后,输出增益波动小于±0.4dB.     

一种新型毫米波矩形波导-微带过渡结构

介绍了一种新颖的、适用于毫米波频段的矩形波导-微带过渡电路结构。该过渡电路具有插入损耗低、频带宽、重复性好的特性。其矩形波导E面相对于微带电路面,以及电磁信号传输方向的位置与脊波导-微带过渡相同。该过渡电路的微带线与波导的转换部分采用非接触式结构,并设计了可调节元件,从而在有一定加工误差的条件下改善其产品传输特性。利用高频仿真软件CST,在Ka频段进行了优化仿真,并对利用其优化值所设计的一对背靠背的电路实物进行了测试,在32～40 GHz的频率范围内,插入损耗小于2.36 dB,回波损耗大于7.22 dB;在整个Ka频段内,插入损耗小于3.49 dB。     

新型半模基片集成波导镜像转接段的研究

本文提出了半模基片集成波导的镜像转接段设计,并对其功率分配方面的应用展开了研究.首先分析了半模基片集成波导应用于功分器设计的局限性,然后提出了通过镜像转接方式来实现具有双侧开口面的新型半模基片集成波导镜像转接段.通过仿真分析和实验测试验证了半模基片集成波导镜像转接段结构及其设计方法的可行性.最后设计了基于镜像转接段且具有对称结构的半模基片集成波导三路功分器.该功分器的仿真结果与实验数据表明,采用镜像连接段的半模基片集成波导器件具有良好的传输性能,有助于拓宽半模基片集成波导在功率分配网络设计方面的应用.     

A Compact and Broadband Differential Microstrip Line to Rectangular Waveguide Transition Using Dipole Antenna

In this paper, a compact full Ka-band differential microstrip line (DML) to rectangular waveguide transition is proposed. The dipole antenna with semi-elliptic arms is introduced to transform the differential mode of DML to the TE10 mode of the rectangular waveguide directly. The two arms of the dipole antenna are connected together by a shorting strip to reduce the size of the dipole. Compared with the DML-to-waveguide transition using the fin-line topology, the size of the proposed transition has been reduced by 86 %. To verify this transition, a back-to-back structure is fabricated and tested. It provides a return loss of better than 15.2 dB and an insertion loss of 0.73 to 1.07 dB within a wide frequency range from 26.5 to 40 GHz. The measurement results show good agreement with the simulation results. Furthermore, a tolerance analysis is also performed via the simulation to prove that this transition is robust in the fabrication and mechanical assembly.     

A Millimeter Wave Six-Port Network Using Half-Mode Substrate Integrated Waveguide

A novel six-port network based on half-mode substrate integrated waveguide (HMSIW) is proposed. In this design, a HMSIW hybrid 3 dB coupler and a -90° phase shifter are designed as fundamental building block of six-port network. By combining four HMSIW couplers and one phase shifter, a HMSIW six-port network at 29–32 GHz is constructed. The six-port network is fabricated and measured. Measurement results agree well with simulation, and show good balance and phase relationship between ports.     

A Novel GCPW to Rectangular Waveguide Transition for 60 GHz Applications

A new type of grounded coplanar waveguide (GCPW) to rectangular waveguide transition in an LTCC multi-layer structure for 60 GHz applications is proposed in this letter. The GCPW and rectangular waveguide are fully integrated on the same substrate, and the ground wall of the rectangular waveguide is made up of a staggered via fence. The transition is accomplished by inserting a bent short stub. We analyze and prove the novel transition structure by applying an equivalent circuit model. Measured results for a single transition show that the insertion loss is 0.345 dB at 59 GHz and the bandwidth is 6.3 GHz. The proposed transition structure with very low loss at a large bandwidth is very suitable for a SiP of 60 GHz WPAN applications.      

Half Mode Substrate Integrated Waveguide (HMSIW) Directional Filter

A double-loop directional filter is described and realized in this work by using a novel guided-wave structure called half mode substrate integrated waveguide (HMSIW), which retains the attractive performances of substrate integrated waveguide (SIW) with a nearly half reduction in size compared to the original SIW version. The demonstrated filter is designed at 12 GHz with less than 3.2 dB insertion loss for a 250-MHz bandwidth, and the minimum insertion loss is 1.5 dB. It presents low insertion loss, high power capacity in planar compact configuration with a standard PCB fabrication process.     

Half Mode Substrate Integrated Waveguide (HMSIW) Bandpass Filter

This letter presents the design and experiment of the half mode substrate integrated waveguide (HMSIW) bandpass filters. Three-pole and five-pole HMSIW filters are simulated by using CST software and fabricated with a single layer standard printed circuit board process. Different external-coupling approaches are adopted in the design of the two filters. The measured results are in good agreement with the simulated results. Low insertion loss and good selectivity are achieved     

一种新型半模基片集成波导三孔定向耦合器

半模基片集成波导(HMSIW)是近年来出现的一种高性能平面导波结构,具有传输损耗小、功率容量大、易于集成等优点,已开始广泛应用于微波无源器件的设计中。文章基于HMSIW技术与PCB工艺技术设计制作了一种新颖的三孔定向耦合器,通过在耦合孔上金属面蚀刻"工"字形槽增加孔的耦合量。设计的HMSIW三孔定向耦合器不仅保持了集成基片波导(SIW)定向耦合器的所有优点,而且在面积上减小了近50﹪,工作带宽拓展到1GHz。实测数据与仿真结果基本吻合,验证了设计方法的正确性与可行性。     

A 340–380 GHz Integrated CB-CPW-to-Waveguide Transition for Sub Millimeter-Wave MMIC Packaging

In this letter, a rectangular waveguide to conductor backed-coplanar waveguide electromagnetic transition suitable of operating at sub-millimeter wave frequencies is demonstrated. The dipole based transition is fabricated using InP monolithic microwave integrated circuit technology. The compact transition eliminates wire-bonding problems (return loss and insertion loss) and is suitable for direct integration of sub-millimeter wave monolithic integrated circuits. Measured transition loss of $sim$ 1 dB has been achieved in the frequency range of 340 to 380 GHz.      

悬置微带线的过渡设计

设计了一种新型微带-悬置微带线和波导-悬置微带线的过渡结构。此过渡模型工艺简单、尺寸紧凑、加工精度不高,在较宽的频带范围内实现了较好的过渡特性。这种过渡设计可以改善悬置微带电路的应用范围,同其它电路或系统可以更好地综合应用。通过仿真设计和样品测试,在整个Ka频段,波导-悬置微带线过渡结构插入损耗小于0.75 dB。     

Broadband transition between half mode substrate integrated waveguide and rectangular waveguide

A broadband transition between a half mode substrate integrated waveguide and a rectangular waveguide with an antipodal fin-line in its quasi-TEM mode is presented. Experimental results show about 1.3 dB insertion loss and below 215 dB return loss for a back-toback double transition over 10 GHz bandwidth from 26.5 to 40 GHz (the single transition insertion loss is about 0.65 dB). The transition may be used in low-loss and low-noise front-end circuits of the microwave and millimetre-wave bands.     

Ka 波段微带检波器设计

介绍了一种中心频率为35 GHz,带宽为±2.5 GHz 的混合集成检波器设计方法及测试结果。该检波器输入端口为标准矩形波导,通过探针到微带的过渡,采用高频电磁场仿真软件和微波电路CAD 软件完成该检波器的设计。测试结果表明,该设计方法实现的检波器具有优良的性能。     

Integrated microstrip and rectangular waveguide in planar form

Usually transitions from microstrip line to rectangular waveguide are made with three-dimensional complex mounting structures. In this paper, a new planar platform is developed in which the microstrip line and rectangular waveguide are fully integrated on the same substrate, and they are interconnected via a simple taper. Our experiments at 28 GHz show that an effective bandwidth of 12% at 20 dB return loss is obtained with an in-band insertion loss better than 0.3 dB. The new transition allows a complete integration of waveguide components on substrate with MICs and MMICs     

Millimeter-Wave Transition From Waveguide to Two Microstrip Lines Using Rectangular Patch Element

A millimeter-wave transition from a waveguide to two microstrip lines and the design methodology are proposed. A rectangular patch element in a short-terminated waveguide is analyzed by the cavity model of a patch antenna and the dyadic Green's function of the waveguide. The analysis points out that the rectangular patch element has an optimum width for wideband, which only has the function of the broad wall width of the waveguide. The transition also works as a divider. A numerical investigation of a transition having two microstrip lines validates the analytical model in terms of wideband, and indicates that the distance between the two microstrip lines has an optimum length for suppressing higher order modes. A prototype transition exhibits an insertion loss of 0.5 dB from 76 to 77 GHz, and a bandwidth of 6.9% (5.29 GHz) for the reflection coefficient below -15 dB for the waveguide port     

一种X 波段磁场耦合式波导-微带转换结构

波导-微带转换器是微波集成电路和天馈线系统中的重要器件。结合具体应用,设计了一款新型、宽带磁耦合式波导-微带转换器。和传统结构相比,本设计用双层的贴片结构代替金属块状阶梯脊,通过在贴片上加载金属过孔来展宽转换的带宽;将阶梯状金属贴片和微带探针一体化设计,从而避免了焊接带来的损耗和结构不稳定,并且减小了加工难度,降低了重量和成本。测试结果表明,波导-微带转换器的两个端口在8.85～11.52GHz 的频带内回波损耗小于-15 dB,插入损耗约为0.8dB,均满足应用需求。     

基于半模基片集成波导互补开环谐振器的新型滤波器研究

一种新型的基于半模基片集成波导（HMSIW）表面上开互补谐振环高性能平面滤波器。该结构允许低于截止频 率以下传输正向波,利用具有高通特性的HMSIW 和CSRR 组成具有带通特性的滤波器,该滤波器具有体积小巧,损耗 低,易制作,并方便与其他电路集成等优势     

Modeling and design for electrical performance of wideband flip-chip transition

A locally matching technique is proposed in this paper to improve the wideband performance of the flip-chip transition. The gap width of the coplanar waveguide (CPW) line in the bump pad region of both the chip and board is enlarged for achieving larger inductance to compensate the capacitance at the transition, making the approximate impedance close to 50 /spl Omega/. An equivalent circuit is derived from the frequency response of the transition simulated by Sonnet and is used to control the zero frequency of the structure. With a properly chosen value of the enlarged width, the zero frequency can be controlled to achieve an optimal transition performance over an as wide as possible bandwidth. A systematic design procedure is established and employed to design a transition over a band from dc to 60 GHz. The design and simulation results are also compared with the measured data of a scaled structure as well as a realization of an optimized flip-chip transition design ranging from dc to Ka band. The measured data show a good agreement with the simulation results, if under a careful calibration procedure. Both demonstrate that the present transition design can achieve better than 25 dB in return loss and 0.2 dB in insertion loss over dc to 35 GHz.     

CPW-to-waveguide transition using three-step Chebyshev transformer

A transition structure between a coplanar line and a rectangular waveguide using a three-step Chebyshev transformer is proposed. The structure was designed, manufactured and tested in the X-band. Measurement results show good agreement with the simulation results. A bandwidth of 32% with a return loss better than -20 dB and an insertion loss better than -1 dB over the X-band were obtained.