H-stub Filter
US Patent #6,169,466 by Rousslan Goulouev

Figure 1: 3D plot of surface of a 13-pole Ku-band filter

Figure 2: Simulated (mode matching) frequency response for TE10-mode

Advantages over conventional corrugated filter*

1. Shorter because of vertical coupling between resonators
2. Provides more rejection on roll-off because of high-loaded Q resonators
3. Handles more microwave power in pulse because of larger voltage gaps

[*] US Patent # 3,597,710 by R. Levy