Synthesis and new applications of multi-port filtering networks

多端口滤波网络综合及新应用

• 批准号: EP/M013529/1
• 负责人: Yi Wang
• 金额: $ 12.56万
• 依托单位: University of Greenwich
• 依托单位国家: 英国
• 项目类别: Research Grant
• 财政年份: 2015
• 资助国家: 英国
• 起止时间: 2015 至 无数据
• 项目状态: 已结题
• 来源: https://gtr.ukri.org/projects?ref=EP%2FM013529%2F1
• 关键词: Synthesis; new; applications; multi; port

Microwave filters are essential components in many wireless systems from mobile base stations to satellites. They are used to select useful signals while rejecting unwanted interferences or spurious signals. The most widely used microwave filters are formed of resonators that are electromagnetically coupled together to generate the required transmission responses between the two ports - input and output. The properties of the resonators and the couplings between them can be mathematically represented by a so-called 'coupling matrix'. Such a matrix may be found - synthesised - from the required frequency response. The synthesis of two-port filters is an established art. Recently this coupling matrix approach has been extended from two-port filters to multi-port filtering networks (MPFNs). The fundamental difference between a filter and a MPFN is the 'junction resonators', introduced to route the signal to different ports. Such resonators serve not only as resonant poles as in a filter, but also as splitters of the signal which are traditionally achieved by non-resonant transmission lines. One of the microwave circuits that benefit most from the MPFN concept is a multiplexer, also known as a combiner or a filter bank. It basically contains multiple interconnected filters, used to combine multiple channels and feed to one antenna for transmission or reception. It is one of the most complex passive circuits in wireless base stations and satellite payloads. Conventionally all the channel filters are connected to the common port through a signal distribution network based on transmission lines. Using the MPFN concept, the transmission line network can be replaced with resonators. This significantly increases the selectivity of the multiplexer without sacrificing the circuit size, which is highly desired by industrial applications. This means the multiplexer, usually a large component, can be reduced in size and mass for a more contact system. In the case of satellites, this can be translated to a significant cost reduction. The exclusive use of resonators in a microwave circuit also enables integrating filtering function into traditional non-filtering circuit. For instance, common microwave power dividers and couplers are transmission-line based with very limited selectivity. By using the MPFN concept, all-resonator-based power dividers and couplers can be realised with embedding filtering functions. This means two circuit functions are merged into one circuit. This approach is known as 'co-design'. Despite the significant increase in the usage of the MPFN concept and co-design approach in microwave circuit design, there are still significant challenges associated with the technique. The synthesis of the MPFNs is much more demanding than the filters. It requires a new understanding of the coupling characteristics around the junction resonators. The currently inaccessible synthesis technique impedes the take-up of the MPFN concept by microwave engineers. Also there are concerns with the bandwidth and power handling capability of the MPFN-enable devices, as the junction resonator is narrowband in nature and may be a concentration of power. This project aims to develop a robust, more accessible and applicable synthesis technique for MPFNs and to address the practical challenges in bandwidth and power handling by proposing novel junction resonators. The research will help to release the full potentials of MPFNs for industrial applications. There is no doubt the MPFN concept will lead to more innovations in microwave circuits. Built on from the synthesis technique, the project will investigate two new circuit concepts. It is expected new research directions on novel microwave circuits, opportunities for further development and commercial exploration will be generated from this project.

微波炉是从移动基站到卫星的许多无线系统中必不可少的组件。它们用于选择有用的信号，同时拒绝不必要的干扰或虚假信号。使用最广泛的微波滤波器是由谐振器组成的，它们在电磁上耦合在一起，以在两个端口之间生成所需的传输响应 - 输入和输出。谐振器的属性及其之间的耦合可以用所谓的“耦合矩阵”来数学表示。可以从所需的频率响应中找到这种矩阵 - 合成的。两端口过滤器的合成是一门已建立的艺术。最近，这种耦合矩阵方法已从两端口过滤器扩展到多端口过滤网络（MPFN）。过滤器和MPFN之间的基本差异是“连接谐振器”，该谐振器被引入将信号路由到不同端口。此类谐振器不仅像过滤器中一样充当共振电线，而且还可以作为传统上通过非谐波传输线实现的信号的分裂。从MPFN概念中受益最大的微波电路之一是多路复用器，也称为组合器或过滤器库。它基本上包含多个相互连接的过滤器，用于将多个通道组合并进给一个天线进行传输或接收。它是无线基站和卫星有效载荷中最复杂的被动电路之一。通常，所有通道过滤器都通过传输线通过信号分布网络连接到公共端口。使用MPFN概念，可以用谐振器替换传输线网络。这显着提高了多路复用器的选择性而不牺牲电路大小，这是工业应用高度期望的。这意味着多路复用器（通常是大型组件）可以减小尺寸和质量，以获得更大的接触系统。就卫星而言，可以将其转化为显着降低成本。在微波电路中的独家使用还可以将过滤功能集成到传统的非过滤电路中。例如，普通的微波功率分隔线和耦合器是基于非常有限的选择性的传输线。通过使用MPFN概念，可以通过嵌入过滤功能来实现基于全谐波的功率分隔线和耦合器。这意味着将两个电路函数合并为一个电路。这种方法称为“共同设计”。尽管MPFN概念和微波电路设计中的共同设计方法的使用显着增加，但该技术仍然存在重大挑战。 MPFN的合成比过滤器要求更高。它需要对连接谐振器周围的耦合特性有了新的了解。当前无法访问的合成技术阻碍了微波工程师对MPFN概念的采用。同样，由于连接谐振器本质上是狭窄的，并且可能是功率的浓度，因此也担心MPFN启用设备的带宽和功率处理能力。该项目旨在为MPFN开发一种强大，更容易获得和适用的合成技术，并通过提出新颖的连接谐振器来解决带宽和功率处理中的实际挑战。该研究将有助于释放MPFN在工业应用中的全部潜力。毫无疑问，MPFN概念将导致微波电路的更多创新。基于合成技术，该项目将研究两个新的电路概念。预计新的微波电路的新研究指示，进一步开发的机会以及该项目将产生商业探索。

项目成果

Integrated filtering planar dipole antenna using edge coupled feed

使用边缘耦合馈电的集成滤波平面偶极天线

• DOI: 10.1109/lapc.2016.7807494
• 发表时间: 2016
• 作者: Ali A

Microstrip triplexer using a common triple-mode resonator

• DOI: 10.1002/mop.31244
• 发表时间: 2018-07-01
• 期刊: MICROWAVE AND OPTICAL TECHNOLOGY LETTERS
• 影响因子: 1.5
• 作者: El-Tokhy, Amira;Wu, Ruiheng;Wang, Yi
• 通讯作者: Wang, Yi

Bandwidth Enhancement of a Circularly Polarised Slot GNSS Antenna using an Integrated Filter-Antenna Approach

使用集成滤波器天线方法增强圆极化缝隙 GNSS 天线的带宽

• DOI: 10.1049/iet-map.2018.5803
• 发表时间: 2019
• 期刊: IET Microwaves, Antennas & Propagation
• 作者: Aly M

Dual-band filtering power divider with capacitor-loaded centrally coupled-line resonators

• DOI: 10.1049/iet-map.2016.0217
• 发表时间: 2017-01
• 期刊: Iet Microwaves Antennas & Propagation
• 影响因子: 1.7
• 作者: Yunlong Lu;G. Dai;Yi Wang;Taijun Liu;Jifu Huang

A KU-BAND FILTERING DUPLEX ANTENNA FOR SATELLITE COMMUNICATIONS

• DOI: 10.2528/pierm19071506
• 发表时间: 2019-09
• 期刊: Progress In Electromagnetics Research M
• 影响因子: 1
• 作者: Mostafa G. Aly;C. Mao;S. Gao;Yi Wang