Substrate integrated waveguide (SIW) linear phase filter

A planar four-pole linear phase filter centered at 10GHz based on substrate integrated waveguide (SIW) is proposed. The filter is composed of four side-by-side horizontally oriented SIW cavities, which are coupled in turn by evanescent waveguide sections with three direct coupling and one cross coupling between the first and fourth SIW cavities. The SIW cavities are fed by microstrips through coupling slots. A curve-fitting technique is adopted to improve the efficiency of the design process. The measured results are presented and compared with the results simulated by a high-frequency structure simulator. Good agreement between the simulated and measured results is observed.     

平衡馈电基片集成波导缝隙阵列全向天线

基于基片集成波导技术与标准印刷电路板工艺,设计并实现了缝隙阵列全向天线.为展宽带宽,天线由两个相同子阵组成.采用带状线 T 型功分器和共面波导转接,实现天线的平衡馈电结构.测试结果与全波仿真结果表明,对称平衡馈电基片集成波导缝隙阵列全向天线具有良好的全向性,较高的增益,相对较宽的带宽和紧凑的结构.     

基片集成波导K波段平面滤波器研制

利用基片集成波导与传统矩形波导的等效关系,类比矩形波导滤波器理论设计方法,结合三维电磁仿真软件模拟和优化技术,快速设计了K波段基片集成波导带通滤波器。实物测试结果显示滤波器的中心频率为19.75GHz,相对带宽6%,通带内插入损耗为1 dB,带内反射系数小于–14 dB,体积小于6 cm×2 cm×1 cm。相比传统波导形式滤波器,本设计为平面结构,体积小、易于系统集成。     

一种应用于毫米波波段的基片集成波导滤波器

提出了一种工作于毫米波波段的基片集成波导滤波器,该滤波器在上下金属层刻蚀出哑铃槽结构,通过哑铃槽之间的耦合,极大提高了其带外抑制性。仿真实测结果表明,滤波器的中心频率在30 GHz,通带内相对带宽为39.5%,中心频率插入损耗为1.44 d B,带内回波损耗大于13 d B。滤波器带外衰减陡峭,结构紧凑,实测结果与仿真结果吻合良好。     

Substrate integrated waveguide elliptic filter with transmission line inserted inverter

A planar waveguide elliptic filter with a transmission line inserted inverter is proposed. This inline filter based on a substrate integrated waveguide is fabricated by the standard PCB process. Simulated results are compared with measured data and good agreement is reported.     

Multilayered substrate integrated waveguide (MSIW) elliptic filter

This letter presents the design and experiment of a novel elliptic filter based on the multilayered substrate integrated waveguide (MSIW) technique. A C-band elliptic filter with four folded MSIW cavities is simulated by using high frequency structure simulator software and fabricated with a two-layer printed circuit board process, the measured results show good performance and in agreement with the simulated results.     

Compact asymmetric coplanar waveguide filter

The design and implementation of a novel asymmetric coplanar waveguide (ACPW) band rejection filter using defected ground structure (DGS) is presented. The proposed ACPW DGS technology provides bandgap characteristics with only one cell in the lateral ground plane. The equivalent circuit model of the proposed DGS unit section is described. Measurements of ACPW DGS showed good agreement with simulation and the proposed model.     

Substrate integrated nonradiative dielectric waveguide

A new substrate integrated circuits (SICs) fabrication technique is proposed for realizing nonradiative dielectric (NRD) waveguide circuits. This new technique called substrate integrated NRD (SINRD) guide allows the NRD guide be integrated within a dielectric substrate by drilling a pattern of air holes. Dispersion analysis and design considerations of the new structure are discussed. A hybrid integrated scheme of planar and SINRD circuits is demonstrated for the first time with simulation and measurement results.     

Development of a low cost microwave mixer using a broad-band substrate integrated waveguide (SIW) coupler

A low cost single-balanced mixer is designed using a newly designed 90/spl deg/ substrate integrated waveguide (SIW) 3-dB coupler, which takes the advantages of low cost, low profile, and high performance. An X-band single-balanced SIW mixer is designed and fabricated with a standard printed circuit board process. Measured conversion loss of 6.8dB and the wide-band response from 8.5 to 12GHz are presented.     

A Broadband Substrate Integrated Waveguide (SIW) Planar Balun

A broadband planar balun is presented in this work that makes use of a substrate integrated waveguide (SIW) technique using a printed circuit board process. The proposed balun structure is able to operate at millimeter wave frequencies and it does not require any tight line coupling sections as frequently used in monolithic microwave integrated circuit balun design. In addition, this balun can be integrated with other planar topologies including nonplanar circuits made of the same substrate for achieving high efficiency. This balun structure consists of a 3 dB SIW power divider and microstrip lines that are placed on both sides of the substrate at balanced ports to obtain an 180deg phase shift. The concept is validated by simulations and measurements. Our measured results suggest that a 10 dB return loss at unbalanced port can easily be achieved across a 42% bandwidth from 19 to 29 GHz. Measured amplitude and phase imbalance between two balanced ports are within 1 dB and plusmn5deg, respectively.     

基片集成波导梳状交替相位功分器

利用基片集成波导技术在单层印制电路板上设计了微波功分器,通过调节感性金属柱的位置,实现了相邻端口的输出相位相差180度的特性,实验测试结果与仿真结果吻合良好.     

基于基片集成波导（SIW）窄边耦合定向耦合器的多路功率分配/合成网络

基片集成波导（SIW）是近年来出现的一种新型传输线,随着现代LTCC技术和PCB技术的快速发展,SIW在现代微波电路中有着较好的应用前景。在此利用这种新型结构,设计了基于SIW窄边耦合定向耦合器的多路功率分配网络,实验样件的测试结果与Ansoft HFSS商用软件仿真结果吻合较好。     

基于基片集成波导(SIW)的双模带通滤波器

首先介绍了基片集成波导(SIW)这一新技术,并用表面电流理论解释了电磁波在SIW中的传输模式。同时,通过使用凹型过渡和接地共面波导过渡两种转换方式,解决了基片集成波导与微带线的过渡问题,从而解决了滤波器和有源微波电路的集成问题。文章用这两种过渡方式,分别设计了中心频率在5.63GHz和5.45GHz的双模带通滤波器。实验表明:这两种滤波器在通带内的反射损耗S11均优于-21dB,-3dB带宽都在50MHz以上。     

基片集成波导准感性窗滤波器的设计与实现

基于基片集成波导技术设计并用印刷电路板工艺实现了2种新型准感性窗滤波器,仿真和实验结果吻合良好。滤波器的中心频率为10.85GHz,相对带宽为4.6%,插损小于1.5dB,该滤波器具有平面集成和容易加工等优点。     

基于基片集成波导的硅微机械滤波器

基片集成波导(SIW)结构是在低损耗的基片上利用金属孔构成的波导结构,具有高品质因数、大功率特性和易于集成的优点,是最近微波电路研究的热点技术.滤波器是微波毫米波电路中最常用的器件,使用SIW可以实现高性能滤波器且保持体积小的优点.     

W波段多波束基片集成波导缝隙阵列天线

束天线.     

一种新型基片集成波导双模带通滤波器

综合基片集成波导和双模滤波器两种前沿技术,设计了一种新型微波带通滤波器结构,该滤波器结构简单,无载品质因数高达10 000。同时,通过使用凹型过渡方式,解决了基片集成波导与微带线的过渡问题,从而方便了滤波器和有源微波电路的集成。文章设计的滤波器中心频率在5.63 GHz,通过TE102和TE201两种模式耦合,产生一个传输零点,极大的改善了阻带效果。实验表明,通带内反射损耗S11优于25 dB,3 dB带宽达60 MHz。     

基片集成波导弯曲结构的研究

基片集成波导以其低损耗和易于集成等特点越来越广泛地应用于微波毫米波电路中。在实际应用中,基片集成波导的直角弯曲结构的运用是不可避免的。针对传统的弯曲结构进行改进,仿真了直切弯曲结构和圆弧弯曲结构的传输特性。并在分析基片集成波导中电感销钉的特性之后,设计了一种含销钉的直角弯曲结构。仿真和实测结果表明,所设计弯曲结构的回波损耗小于-15dB,带宽达到4.8GHz,通带内电压传输系数高于-1.5dB,具有良好的传输性能,可以广泛地应用于微波电路中。     

非对称单脊波导带通滤波器的设计

介绍了非对称单脊波导带通滤波器的基本原理,详细描述了准确设计该滤波器的方法,包括耦合尺寸的提取、谐振器尺寸的逼近及电纳斜率参数的获取。给出了X波段实例的详细设计过程及测试结果。     

一种基于介质集成波导腔的小型化滤波器

为了实现介质集成波导滤波器的进一步小型化,通常要改进其谐振腔;通过在传统的介质集成波导谐振腔中心位置插入一个短路销钉,并且将其上金属平面与腔体四周的金属壁绝缘可以实现其体积的小型化.采用这种小型化谐振腔,设计了四腔微带滤波器,工作在2.8 GHz,相对带宽14.3％.最终加工了这个原型滤波器,仿真和测试结果吻合良好.相比采用传统的介质集成波导谐振腔的滤波器,这个滤波器尺寸可以减小到其1/4以下.