Elliptic Filter Design Software

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In an era of a myriad of design tools developed to “save” the filter designer time and effort, it’s exactly time and effort that may be lost due to learning curves, cumbersome workflows, and limitations of the design process itself. Powerful design tools may thus be rendered effectively useless by any one of these problems.For example, a tool that provides powerful synthesis may fall short when the output fails to be in a realizable form, or when users find the design process too cumbersome to waste time on.

Furthermore, at higher frequencies, parasitic effects become increasingly difficult to manage, and countless hours may be wasted in the hardware lab if inadequate software is used.Fortunately, design tools do exist that overcome these limitations. Specifically, offers FilterSolutions, which applies the best-suited manufacturer or internal parts model automatically selected from a user-customizable database, such as the software device library, device library, or the CLR Library within the NI AWR Design Environment platform.For user-customizable libraries, users merely need to select a parts family, which may be custom built or supplied by the manufacturer(s).

FilterSolutions then completes the design process. In the case of higher frequencies (typically above 200 MHz), FilterSolutions exports directly into the NI AWR or CST Studio Suite design environments for interconnect simulations and further optimizations.

Accurate lumped-element designs at very high frequencies may be quickly realized when using FilterSolutions with the NI AWR software and Modelithics. With the CST Studio Suite, other 3D features like the enclosure and connectors could be further added to the model.Internal Part LibrariesFor low-frequency designs (typically below 200 MHz), automated part selection generally involves just simply selecting the part family from a directory of S-parameter and/or Spice model libraries supplied by the manufacturers and/or created by the user. Nuhertz’s patent-pending process employs easy-to-use pop-up menus of part families that make the learning curve negligible, enabling new users to quickly create accurate lumped designs with discrete parts.Interconnect parasitics may be neglected initially, while the design accuracy is achieved by selecting a parts family with traits suitable for the design environment.

Individual elements may be adjusted via a left-mouse click to individually select part families or S-parameter or Spice model files of specific parts (Fig. This is a 7-pole Elliptic example with Coilcraft 1008 Series S-parameter inductors and Murata 0603 temperature-compensating Spice model capacitors.Coilcraft Filter DesignerFor simple low-order Elliptic filters, Filter Designer offers discrete-inductor-element-designs from Coilcraft libraries. It’s freely available from the Coilcraft website. Coilcraft inductor samples may be obtained directly from the results screen.NI AWR and CST Studio Suite Software LibrariesUsers can directly export lumped filters designed with discrete elements from user libraries into NI AWR or CST Studio Suite.

In addition, those using these Nuhertz partner tools may take advantage of the respective device libraries for high-frequency discrete-lumped-filter design. Use of the NI AWR Design Environment platform, specifically the Microwave Office software and the AWR website or MWO Vendor Local libraries, and the CST Studio Suite device library, is highly advantageous due to accurate and high-frequency simulation capabilities provided by microstrip interconnects. Interconnect geometry may be further optimized to achieve a closer match to design requirements.Similar easy-to-use pop-up menus in the FilterSolutions export panel allow for selection of NI AWR, CST Studio Suite, or part family. FilterSolutions then exports the model that most closely matches the design value into the NI AWR or CST Studio Suite software, which is where the optimization goals are set up to enable the user to quickly optimize interconnect geometry as needed.Furthermore, high-frequency lumped designs that require electromagnetic (EM) simulations for accuracy may be exported directly into NI AWR software, specifically the AXIEM 3D planar EM simulator or any of the NI AWR software partner EM simulators. These designs can also be exported into the CST Studio Suite software, where the 3D packages can be specified for the full-wave simulation model.2.

Shown is a 250-MHz and pole Elliptic discrete-filter design with the NI AWR software web library and Coilcraft 1008 Series inductors and AVX Accup-0603 capacitors.Optimization goals may be easily adjusted as needed in NI AWR and CST Studio Suite to obtain desirable results. One way to manually compensate for interconnect parasitic effects at higher frequencies is to design at a slightly higher frequency than the design requirements.

One can then adjust the optimization goals down to the desired design frequency to obtain a reasonably close match between the initially designed filter and the required design frequencies. In the NI AWR software, the FilterSolutions export panel may automate this down-frequency adjustment ( Fig. 2).CST Studio Suite Filter Designer 2DIn CST Studio Suite, Filter Designer 2D provides a seamless workflow for the design of lumped-element filters, with the underlying technology based on Nuhertz software. Once a filter is synthesized, the fully parameterized model is built in the CST Studio Suite schematic environment from which further analysis can be triggered.

A 3D model is automatically configured by the System Assembly and Modeling, and it may include the package footprint of each lumped component. A range of full-wave EM solvers are available for either frequency- or time-domain analysis, while the optimizer can be setup with either S-parameter masks or the recently introduced coupling matrix extraction technique (Fig. This screenshot depicts a 250-MHz 7-pole Elliptic discrete filter design in CST Studio Suite using the device library with Coilcraft 1008 Series inductors and TDK capacitors.Modelithics Library in NI AWR Design EnvironmentThe easiest and most accurate method to design filters with discrete lumped elements is to use the Modelithics CLR Library of accurate part-value and substrate-scalable models in the NI AWR Design Environment framework. Modelithics employs exceptional and highly scalable (and therefore tunable) modeling accuracy.FilterSolutions takes advantage of the Modelithics/NI AWR software interface to set up discrete optimizers that very rapidly zero in on the best overall choice of Modelithics models for each lumped-filter element. It then sets the interconnect optimization flag in the NI AWR software so that the user can optimize the interconnect geometry. Accurate, discrete multi-gigahertz lumped-element filter designs may be realized very rapidly using Nuhertz together with Modelithics and the NI AWR Design Environment software.

This is a 1-GHz, 9-pole Elliptic filter designed with discrete lumped elements using FilterSolutions with the Modelithics CLR Library models and NI AWR software.For higher-frequency designs (i.e., above 1 GHz), the AXIEM 3D planar EM simulator may be employed to analyze detailed EM effects. It may also be used for extraction optimization, if necessary (Fig. 4).Jeff Kahler is Technical Director at.Reference1. Dunleavy, and J. Kahler, “Synthesize Filters with Wideband Success,” Microwaves & RF, July 2014. Many have already seen your name thanks to the blogs. What do you want readers to gain from them?MATLAB and Simulink are used by a large and diverse customer base.

As a result, we see firsthand how much modeling improves the likelihood of project-level success, especially as system complexity increases. 5G, radar, and electronic-warfare (EW) systems span multiple signal domains, so many technical disciplines must come together to design and field a system.We see areas where the 5G community leverages phased-array antenna, RF, and signal-processing technology previously developed for aerospace and defense applications.

We also see the convergence of applications in the form of multifunction RF apertures, where the system alternates between surveillance, communications, interference management, and even weather-related functions. With the availability of commercial software-defined radios and radars, the number of applications continues to grow rapidly. This means new communications and radar engineers enter the field and need to ramp up quickly.Each of these trends adds complexity to new projects. Our goal with the blog series is to share examples and techniques where simulation can be applied to reduce risk. Dead space 3 download. Hopefully, readers gain insights into the full signal chain at the early phases of development where they have the greatest flexibility to make the most intelligent design choices. They also can gain confidence in their design before they field it.Can you tell us some of the ways that supports the needs of both commercial wireless and aerospace/defense applications?There’s a great mix of wireless and aerospace/defense engineers that use our platform products, MATLAB and Simulink, as the basis for simulation. We have continued to expand the number of focused tools that are application-specific.

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For example, in wireless, this includes products that are focused on 5G along with other standards-based wireless. In addition, we have built up specific tools that focus on each part of the system. This has also helped to bring large development teams together. For example, the RF and antenna engineers on a project can integrate with their signal-processing and system-level colleagues.We also support smaller teams by enabling broader workflows. This could be where system engineers can get an idea of how changes in subsystems impact overall performance. It also can be helpful for engineers responsible for a specific subsystem to see how design choices impact other subsystems. We have connected workflows across the different technical disciplines, too.

This helps downstream when systems are integrated.The other good news is that with the advent of the multifunction RF aperture, technology cross-pollination across industries is accelerated. In addition, we continue to expand our modeling capabilities so that different levels of abstraction can be used depending on what’s needed during specific project phases. As projects mature, higher-fidelity capabilities can be applied when they make the most sense.The was launched last year. What’s been the reception to that?The reception has been very positive.

It’s been great to see such a rapid adoption of a new product. It really speaks to the timeliness of having the 5G Toolbox so close to the standard approval.We see two main areas of adoption: teams that want to ramp up on the standard quickly and teams that are already experts but need a framework to develop algorithms on. One very well received aspect of 5G Toolbox is that it’s all written in MATLAB. Anyone that has the toolbox also has the code for all of the algorithms and building blocks. This gives our customers great insight into all aspects of 5G.You’ve spoken a great deal about hybrid beamforming. Why is this significant?It’s been a popular topic from our customers. We receive a lot of requests to help with system modeling and more specifically system-level partitioning.

It’s one of the areas in a large system where the disciplines meet. Antenna array meets RF chain meets signal processing. The results of making the right architectural choices in this area translate to lower system cost and at required performance levels. Even as systems evolve to fully digital beamforming, this is an area that continues to be of high interest.In the early part of 2020, we will include several new blog posts on integrating higher-fidelity models for antenna elements and RF components, along with 5G waveforms.Can you explain how MathWorks is diving deeper into RF and antenna modeling?We have continued to expand our antenna and RF modeling to respond to customer requirements.

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Chebyshev Bandpass Filter Calculator

This includes more complex antenna designs and structures. It also includes support for more RF analysis and architectures.

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Our RF and antenna element libraries continue to grow. It’s easy to solve for your own structures as well.With our RF and antenna tools, we always try to help customers balance options for fidelity with simulation time. The other area we spend a lot of time thinking about is ease of use. This is helpful to seasoned veterans in the field, but it’s also great for others getting started or expanding their work focus. Finally, as I mentioned earlier, we ensure that the results of RF and antenna modeling can be directly integrated into system-level models.