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。     

一种新型基片集成波导带通滤波器的设计与实现

基片集成波导（SIW）技术使得包括平面电路、接头和矩形波导在内的完整电路可以以平面形式集成在印刷电路板上;本文简要介绍SIW这一新技术,然后利用其高通特性,再加载一个低通微带滤波器,设计了一个中心频率为18 GHz,相对带宽为33%的SIW带通滤波器,CST的数值计算结果显示该途径是成功的。     

基片集成波导双感性柱滤波器的研究

采用模式匹配法设计了双排正方柱金属销波导带通滤波器,然后利用经验公式将正方柱等效成圆柱.在此基础上又利用基片集成波导和普通矩形波导之间的转换公式,将普通波导滤波器改用基片集成波导结构来实现,滤波器采用双排金属过孔结构使所设计的滤波器具有良好的带外抑制特性.且结构简单、成本低廉,便于加工,适合批量生产.设计结果的HFSS仿真验证了模式匹配法的精确性和经验公式的可靠性.     

X波段基片集成波导带通滤波器的设计

基片集成波导是一种具有低差损、低辐射、高品质因数的新型平面导波结构.文中利用基片集成波导结构设计并制作了一种x波段的带通滤波器,该滤波器易与其它微波平面电路集成.实测结果表明,该滤波器的中心频率是9.58 GHz,相对带宽是8.35%,通带内的插入损耗是3.8 dB,回波损耗＜-15 dB.     

一种新型基片集成波导带通滤波器的设计

基片集成波导是一种具有低差损、低辐射、高品质因数的新型平面导波结构.文中利用基片集成波导结构设计并制作了一种工作于X波段的带通滤波器,该滤波器易与其它微波平面电路集成.实测结果表明,该滤波器的中心频率是9.75GHz,相对带宽是15.4%,通带内反射系数均小于-15dB,插入损耗均优于1.5dB,与仿真结果基本吻合,验证了设计方法的正确性.     

基于非谐振节点的基片集成波导滤波器设计

针对微波滤波器小型化和高性能的应用要求,基于非谐振节点技术,提出了一种高选择性的双模基片集成波导带通滤波器。非谐振节点通过带线谐振器实现,可以在源负载之间引入额外的信号传输路径,与传统的双模基片集成波导滤波器相比,该滤波器可以引入额外的传输零点,从而提高滤波器的选择性和带外抑制。此外,带线谐振器嵌入基片集成波导谐振腔的内部,不占据额外的电路面积,使其结构更加紧凑。最后,设计并加工了一款工作频率为28 GHz,相对带宽为1.6%的高选择性带通滤波器。测试结果与仿真结果相一致,表明了所提出设计方法的可行性。     

Ku波段基片集成波导带通滤波器的设计

设计了一款基于基片集成波导的ku波段卫星通信的带通滤波器。描述了位于SIW内部的金属通孔的等效电路模型,并分析通孔直径、位置等关键参数对滤波器性能的影响。针对基于中心位置的SIW带通滤波器带宽较窄的问题,提出偏置金属通孔SIW带通滤波器的设计方法,从而增大滤波器的带宽。并通过对改进后的基片集成波导带通滤波器的仿真,验证了设计的正确性和方法的有效性。     

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     

基片集成波导三腔感性耦合腔体滤波器的设计研究

工程实际中常用的带通滤波器设计方法是从原形低通模型出发,经过频率变换和元件参数值的变换得到集总参数谐振腔元件数值的大小,再利用微波结构加以实现。本论文以一个基片集成波导感性耦合腔体滤波器的设计为例,详细的阐述了基片集成波导腔体滤波器的设计过程。之后,按照此类腔体滤波器的设计方法,设计了多款腔体带通滤波器,包括有极高的频率选择性的交叉耦合滤波器,具有优良的性能和小型化效果。     

半模基片集成波导带通滤波器的设计与实现

简要介绍半模基片集成波导这一新技术,设计了一个中心频率为35GHz,相对带宽为23％的基片集成波导带通滤波器,CST的数值计算结果显示该途径是成功的.     

Guided-wave and leakage characteristics of substrate integrated waveguide

The substrate integrated waveguide (SIW) technique makes it possible that a complete circuit including planar circuitry, transitions, and rectangular waveguides are fabricated in planar form using a standard printed circuit board or other planar processing techniques. In this paper, guided wave and modes characteristics of such an SIW periodic structure are studied in detail for the first time. A numerical multimode calibration procedure is proposed and developed with a commercial software package on the basis of a full-wave finite-element method for the accurate extraction of complex propagation constants of the SIW structure. Two different lengths of the SIW are numerically simulated under multimode excitation. By means of our proposed technique, the complex propagation constant of each SIW mode can accurately be extracted and the electromagnetic bandstop phenomena of periodic structures are also investigated. Experiments are made to validate our proposed technique. Simple design rules are provided and discussed.     

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.     

Multilayer Substrate Integrated Waveguide Six-Port Circuit

In this paper a new design of a six-port circuit based on multilayer substrate integrated waveguides (SIW) is presented. This design is based on the use of a multilayer structure aimed at reducing the dimension of the circuit while conserving the performances of the component. The designed SIW six-port is composed of two basic elements, a SIW power divider and directional coupler. These two elements are designed, optimized and matched to produce a better performance at the required operating frequency of 11 GHz. The results of simulations show that the new multilayer SIW six-port circuit has good performances including a good return loss and isolation under–20 dB and the transmission magnitude better than–10 dB. This multilayer SIW six-port has the advantage of a small size 160-34.8 mm; its width is about 50% smaller than the planar SIW six-port circuit, which helps to get a higher density of integration in telecommunication systems and allows much smaller devices to be conceived.A microstrip toSIWtransition is used in order to facilitate the integration of this component into other planar circuits. The structures are designed, simulated and optimized using the Ansoft HFSS simulation software.     

双/三模基片集成波导和共面波导混合结构滤波器设计

针对微波带通滤波器小型化、高性能的应用需求,提出使用双/三模方形基片集成波导和共面波导混合结构设计带通滤波器.通过改变双模基片集成波导中TE₁₀₂和TE₂₀₁的谐振频率和外部耦合的强弱,可实现具有近似椭圆、非对称和无传输零点响应的双模滤波器;两个相同尺寸的共面波导作为谐振器蚀刻在基片集成波导表面,与TE₁₀₂和TE₂₀₁共同形成一个通带,设计具有多样性响应的四阶滤波器.在具有非对称响应四阶滤波器的基础上,使主模TE₁₀₁频率移动到该通带附近,设计更宽带宽的五阶滤波器.并对设计的滤波器进行加工和测试.测试结果与仿真结果吻合,表明了该混合结构设计高性能滤波器方法的可行性.     

Highly selective bandpass filter based on substrate integrated waveguide

A novel highly selective six-pole elliptic filter based on a substrate integrated waveguide (SIW) is proposed for the first time. The filter is composed of two planar SIW extend doublets. The modular design approach based on cascading small building blocks is adopted to reduce the effect of manufacturing tolerance on the performance of the filter. The proposed filter can produce four finite transmission zeros, and has an excellent stopband rejection characteristic. Measured results are presented and compared with results simulated by a high frequency structure simulator. Good agreement between simulated and measured results is observed.     

Evanescent-Mode Bandpass Filters Using Folded and Ridge Substrate Integrated Waveguides (SIWs)

A novel evanescent-mode bandpass filter (BPF) is presented using folded and ridge substrate integrated waveguides (FSIWs & RSIWs). Both measured and simulated S-parameters are presented to show the characteristics, with good agreements achieved between them. It is experimentally validated that such a BPF has better performance in spurious suppression and much smaller size than those of conventional SIW cavity-coupled counterparts.      

Realization of dielectric loaded waveguide filter with substrate integrated waveguide technique based on incorporation of two substrates with different relative permittivity

In this paper a new structure based on substrate integrated waveguide (SIW), called incorporated substrate integrated waveguide (ISIW), has been used to implement the dielectric loaded waveguide filter in planar structure. Conventional waveguide filter and dielectric loaded waveguide filter have been realized with SIW and ISIW technique, respectively. The use of ISIW structure has reduced the size of the filter, required precision in designing process and the cost of manufacturing process, at the cost of increasing the losses. Thus, while the size of filter and the cost of manufacturing process reduce significantly, there is no need to build the particular dielectric material as resonator and integration with other microstrip devices will be much easier too. Two different excitation mechanism have been considered to cancel the spurious response in the desired frequency band. The SIW and ISIW filters have been fabricated and fairly compared with waveguide filters. Advantages and disadvantages of ISIW structure have been scrutinized in detail. Good agreement between the simulated and measured frequency response of proposed filters has been shown.     

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.     

A new six-port junction based on substrate integrated waveguide technology

A six-port junction based on the substrate integrated waveguide (SIW) technology is proposed and presented. In this design of such a junction, the SIW is first converted to an equivalent rectangular waveguide, then regular rectangular waveguide design techniques are used. In this structure, an SIW power divider and SIW hybrid 3-dB coupler are designed as fundamental building blocks. A six-port junction circuit operating at 24 GHz is fabricated and measured. Good agreement between simulated and measured results is found for the proposed six-port junction.