Planar Filters Continue to Advance
A primary goal of every RF subsystem today is size reduction — without reducing performance and without increasing cost — while operating at millimeter-wave frequencies that have been only sparsely occupied until now. So, it is interesting that long before surface acoustic wave (SAW) and bulk acoustic wave (BAW) technologies reduced the achievable size of Filters by orders of magnitude, the Microstrip filter has been doing the same thing since 1952. They remain one of the most important types of filters in engineers’ toolkits, and they have been enhanced over the years through the use of various dielectric substrate materials and design techniques.
Microstrip filters are considered planar because they are constructed using flat two-dimensional microstrip resonators on a dielectric substrate. Generally speaking, they offer similar performance to their larger counterparts built with discrete components that must be tuned by hand to achieve the desired results. They also have the advantage of being much smaller, well suited for high-volume manufacturing, and available on tape-and-reel, are at least an order of magnitude smaller, and when realized in thin film can achieve similar unloaded Q.
Although microstrip transmission lines are the most common, coplanar waveguides and stripline are also used and can, in some cases, produce better performance. As they are inherently planar and suitable for high dielectric substrate materials, they can also be integrated with gallium arsenide and gallium nitride bare die to reduce a circuit’s footprint. In addition, 3D design tools allow Planar Filters to be designed and immediately moved to prototype and then production very quickly.
Over the many years that this type of filter has been used, hundreds and perhaps thousands of variations have been developed, each created to optimize one or more performance characteristics. The result is that low-pass, high-pass, bandpass, and bandstop (notch), diplexers, multiplexers, dual-mode filters, and switched filter banks are available frequencies well into the millimeter-wave region.
There is almost no limit to the filter designs that can be built using a PC board pattern cut with hairpin curves, straight lines of varying widths, and other geometric arrangements alone or in combination. Some microstrip bandpass filters can simultaneously handle two or more frequencies and include notch filters as well. This would be difficult or impossible using other types of filter structures.
Although planar filters can use air as a dielectric to reduce losses, they are typically fabricated using a solid dielectric substrate on which a metal filter circuit layer is placed, with the main ground layer on the underside of the dielectric. Epoxy-based material such as FR4 can be used below 1 GHz for filters with large relative bandwidths, and PTFE-based material is also common. However, ceramics such as alumina as well as barium titanate provide significant benefits at higher frequencies.
A good example of a planar filter is Planar X technology available from Smiths Interconnect, which is currently available for frequencies up to 30 GHz although development work is continuing to reach even higher frequencies. In a typical bandpass configuration, bandwidths can span from 5% to greater than 100%, depending on circuit configuration, and achievable rejections can be more than 30 dB with low insertion loss, return loss of 15 dB, and power handling of up to 20W.
These miniature, economical RF filters are fabricated with thick film process technology on various dielectric and are ideal for harsh environments.
While their size varies, they can be made as small as 0.1-inch x 0.1 inch, and, depending on the requirements, Planar X filters can be fabricated with either thin-film or thick-film processes, as well as alumina, barium titanate and other substrate materials. The company’s technology and testing capabilities allow the filters to meet high-reliability requirements typically mandated for use in aerospace and defense systems, and a wide degree of customization is also achievable.
Planar filters are also an excellent choice for use in switched filter banks as they can save considerable board space because their filters and switches are integrated within a single module. They also eliminate transitions between circuits to allow optimal matching with the result that insertion loss, flatness, and VSWR are optimized, and internal channelization provides high rejection and isolation. Not surprisingly, these filter banks continue to be used throughout the defense industry for applications such as radar warning receivers, Signal Intelligence and Communication Intelligence (SIGINT and COMINT) receivers, as well as broadcast and satellite communications systems.
Summary
Along with waveguide, the humble microstrip filter, even though it originated at least 75 years ago, continues to demonstrate its capabilities and is likely to maintain its importance as commercial and defense systems move into higher regions of the spectrum. They will achieve this in the face of competition from more modern technologies because they are smaller than all other filter topologies, surpassed only by MEMS filters that have just recently entered the marketplace. In addition, the processes used to manufacture them are similar to those used for fabricating PC boards, they can be customized to meet a broad array of requirements and their characteristics have been verified through thousands of designs.
Research into microstrip filters continues, and while the microstrip line is still their primary transmission medium, coplanar waveguide, and slotted ground structures are also being enhanced to achieve greater miniaturization and, in some cases, higher performance. There is also interesting research being conducted into microstrip lines within periodic structures that prohibit wave propagation at certain frequencies, including photonic bandgap, electromagnetic bandgap, and defected ground structures. The latter has the advantage of being achievable by etching only a few areas on the ground plane below the microstrip line and is created in the form of an etched-out pattern on the ground plane.
In short, there appears to be no end to the uses for microstrip filters, even though systems overall are decreasing in size and operating frequencies are increasing well into the millimeter-wave region.
Smiths Interconnect filters are available to suit a wide range of applications in the military, commercial and aerospace fields. For more information, please see the notes for each filter topology. Superior performance is achieved through the use of high "Q" components and computer modeling.
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Smiths Interconnect, a global supplier of cutting-edge connectivity solutions, has invested in a comprehensive range of environmental tests at their Dundee facility. This offers an important capability to customers not prepared to negotiate on fundamental reliability and insist on demonstrable compliance.
家用电器用商用级噪声抑制滤波器/VFS5045系列TDK等效电路模型库
描述- TDK发布了VFS5045系列噪声抑制滤波器的等效电路模型库，适用于家用电器等商业级应用。该库包含多个型号，如VFS5045VA031至VFS5045SA151，提供详细的电路图、参数和元件值。
型号- VFS5045VA102,VFS5045 SERIES,VFS5045VA301,VFS5045,VFS5045VA151,VFS5045VA031,VFS5045SA151,VFS5045VA111
滤波器和双工器
描述- Lorch Microwave提供一系列离散的 lumped element filters 和 diplexers，采用标准“现货”包装，内部组件、电路拓扑和传输函数与为军事和太空应用制造的 Lorch 滤波器产品相同。这些滤波器适用于不需要密封包装、成本较低和快速交付的场合。产品包括带通、低通和高通滤波器，频率范围为 50 MHz 至 3000 MHz，长度随节段数量变化，宽度恒定为 0.50 英寸，高度最大为 0.27 英寸。SME 系列具有更小的输入/输出垫配置，以实现更好的阻抗匹配。此外，还提供具有相同电路拓扑的 diplexers，长度取决于每个通道中的节段数量，宽度和高度分别为 0.50 英寸和最大 0.27 英寸。
型号- LP10,LP20,DI40,LP30,DI30,DI20,HP30,HP10,HP20,E-SERIES,DX40,DX30,BP10,DX20,BP20,BP30
商业航空航天连接解决方案
描述- Smiths Interconnect 是商业航空航天领域高可靠性连接产品和服务的主要供应商。公司提供高性能连接器解决方案、天线系统、射频组件和电缆组装，服务于飞行控制与导航系统、发动机系统、电源分配、卫星通信连接等多种航空应用。其技术品牌包括 EMC、Hypertac、IDI 等，专注于为高科技、高质量解决方案提供卓越性能，以满足高度安全和耐用性需求。此外，Smiths Interconnect 还提供广泛的认证标准和技术支持服务，以适应全球市场。
Smiths Interconnect announces the launch of its Planar X Series of Thin Film Bandpass Filters for critical RF filtering in X, Ku, and Ka bands
Smiths Interconnect announces today the launch of its Planar X Series of Thin Film Bandpass Filters designed for applications in harsh environments. The Planar X Series provides system engineers with a high-performance, compact solution for critical RF filtering in X, Ku, and Ka bands.
P-DUKE MCF Series Highly Integrated DC/DC Front-end Filters Accepting 9-36Vdc Input Voltage for Military and Rolling Stock Applications
P-DUKE has launched the new MCF series which are front-end filters for P-DUKE COTS (commercial-off-the-shelf) DC/DC converters to comply with the requirements of MIL-STD 1275D and MIL-STD 461. This filter series accepts 9-36Vdc input voltage (50Vdc for 1 sec.) .
电子商城
现货市场
服务
可定制丙烯酸酯胶粘剂的粘度范围：250~36000 mPa·s，硬度范围：50Shore 00~85Shore D，其他参数如外观颜色，固化能量等也可按需定制。
最小起订量： 1 提交需求>
可定制环氧胶的粘度范围：9000~170000 mPa·s；固化方式：可加热、仅室温、可UV；其他参数如外观颜色、硬度等也可按需定制。
最小起订量： 1支 提交需求>
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