What is the following type of microstrip filter called, and how can it be calculated?

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Malcolm White

I'd call that a combline filter, if it had more central elements all pointing the same way.

Abbas Thajeel Rhaif Alsahlanee

Digital Filter Performance Based on Squared Error

https://ieeexplore.ieee.org/document/9626820

Conference Paper Digital Filter Performance Based on Squared Error

Convergence Rate For Low-Pass Infinite Impulse Response Digital Filter

Conference Paper Convergence Rate For Low-Pass Infinite Impulse Response Digital Filter