These tutorials are a great way to get you introduced to the design flow of Couplings Designer. Note that you need additional software to simulate the physical electro-magnetic couplings used in the filter structures proposed. The documentation lists each feature of Couplings Designer along with tips on how to get the most out of this tool.
Advanced filter synthesis concepts
A demonstration of advanced filter synthesis concepts that can be applied to your future designs to meet the demand for stringent requirements. Couplings Designer makes it easy.
- Transmission zeros – the importance of transmission zeros and how they can be engineered to create advanced filter responses for increased rejection and/or group delay equalisation.
- Non-resonating Nodes, NRNs – the relatively new building block, a non-resonating node or NRN, can be used to create new advanced filter topologies.
- Predistortion – the benefits of predistortion when size and cost requirements are stringent.
- Resonator Q distribution – the importance of distributing the resonator Qs correctly when reducing the size of a filter implementation.
- Topologies – the concerns involved in choosing an appropriate topology, especially the sensitivity issues inherited in certain topologies.
- Optimization – the power of combining two synthesis methods, exact approximation with prescribed zeros and optimization, to synthesize a coupling matrix according to a specification.
How to turn your synthesized coupling matrices into physical filters. Discover the benefits and versatility of coupled filter design with coupling matrix techniques; the independence on technology, frequency, bandwidth and port impedance.
- Lumped filter design using coupling matrix techniques – Learn how to turn your synthesized coupling matrix into lumped elements for low frequency applications where waveguide and planar implementations wouldn’t make sense. It is also interesting reading for those doing miniature filters on thin film or MMIC at higher frequencies.
- Combline cavity filter – In this tutorial we will learn how to synthesize and implement a chebyshev response with a combline cavity topology using Couplings Designer. Couplings are extracted and linked to physical dimensions and then combined to realize the final filter layout. It will be shown that unintended couplings may distort the passband and stopband performance. These coupling are analyzed by Couplings Designer with a new coupling matrix that takes them into account and the final physical dimensions are tuned to reflect the change, finally retreiving the chebyshev response.
- Coaxial cavity filter with transmission zeros – An aluminum coaxial re-entrant resonator is designed for high Q to meet specifications on insertion loss. High rejection is achieved with a symmetrical pair of transmission zeros implemented using an electric probe. The filter is implemented with the well known folded topology which is fairly insensitive to manufacturing tolerances. Port tuning is introduced which cuts simulation time and makes the connection to the synthesized coupling matrix transparent.
- COMING SOON – TE101 cavity-resonator filter
- COMING SOON – Dual-mode microstrip open-loop filter with NRNs
- COMING SOON – TM120/TM210 dual-mode cavity-resonator filter with NRNs
- COMING SOON – Coaxial cavity diplexer with extended box topology
- COMING SOON – Coaxial canonical (N zeros) inline filter with NRNs
- COMING SOON – Microstrip dual-band filter with NRNs
Please leave a comment if you run into problems, have a feature request or if you find these tutorials helpful, all user feedback is welcome!