A short open-ended branch attached to a microstrip line acts as a resonant stub. Changing its length changes the frequencies that pass through the line. It is a compact way to connect a geometric design variable, a frequency response and a local field pattern.
Historical visualization. The design-path and field films use different stub lengths. They illustrate the same structure family, not one jointly reproduced result.
Read the model
| Part | Meaning |
|---|---|
| Structure | A planar microstrip line with an open-ended side branch |
| Materials | Conducting trace and ground with a dielectric substrate |
| Design variable | The open-stub length |
| Measured response | Transmission through the line, S21, over frequency |
| Field panel | A normalized Ez slice at one frequency |
The field movie uses a 7.22 mm stub. The final spectrum associated with the archived design path uses 7.14 mm. The field panel therefore explains the local mechanism without certifying the final design-path spectrum.
Follow the design path
Explore the related source
The versioned notch research example
contains the model and design objective. It is a full multi-start research
workload: unlike the taper example, it has no short SMOKE=1 mode.
Read its run notes
before executing it from a matching source checkout:
JAX_PLATFORMS=cpu PYTHONPATH=. python validation/tmtt_paper/msl_stub_notch_tuning.pyFor a smaller first exercise, use Ports and S-Parameters 101. Keep the excitation, port calculator and reference planes with any new response.
Try changing: the stub length. Track where the transmission minimum moves across the band, and inspect the full curve rather than a single frequency bin.
Evidence and provenance
These original presentation clips have not been regenerated on the documentation revision. The exact simulation source revision and a complete raw data bundle are not available here. The current source link identifies a related model; running it does not promise byte-for-byte recreation of either film. No current notch-depth, gradient-accuracy or cross-solver agreement is claimed by this page.
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