Webinar: Microstrip Cross-Coupled Filter Design

Aug 2, 2017
Event location: 

Technical Education Webinar Series - Free One-Hour Webinar Sponsored by National Instruments

This presentation builds on a previous webinar where a microstrip combline filter was designed. This webinar explores how to add a cross-coupling to the microstrip combline. A capacitive cross-coupling will be added that produces a transmission zero on the low side of the passband. There are several ways to physically realize the desired cross-coupling, which will be reviewed before choosing the final physical realization.

Sonnet em will be used to analyze the planar filter in a cutoff waveguide channel. An extra port will be added to each resonator in the Sonnet em model so the EM simulation results can be port tuned using NI AWR Design Environment, specifically Microwave Office circuit design software and EQR_OPT_MWO from SW Filter Design. This combination of tools will enable participants to rapidly try different configurations for the desired cross-coupling. Once a topology is chosen, the cross-coupling will be "grown" into the filter layout using optimization. The combination of port tuning and robust, repeatable optimization makes this a very simple and intuitive design process.

Presenter Bio:
Daniel G. Swanson, Jr., General Partner, SW Filter Design, Boulder, Colorado, USA. Mr. Swanson received his BSEE degree from the University of Illinois and his MSEE degree from the University of Michigan. He has designed broadband amplifiers, various types of oscillators, thin-film filters and high Q cavity filters for both military and commercial applications. He is currently developing software tools for filter design and optimization with his partner Bob Wenzel. Mr. Swanson is the principal author of Microwave Circuit Modeling Using Electromagnetic Field Simulation. He is presently teaching several continuing education courses on filter design and EM simulation. Mr. Swanson is a Fellow of the IEEE and has served the IEEE MTT Society in many capacities.