Stepped-impedance corrugated waveguide filter

Broad Wall Stepped Corrugated Waveguide Filter
Typical Performance for a Ku-Band Filter

Advantages over Ridged Evanescent-Mode Filter

Advantages over Waffle-Iron Filter

Advantages over Conventional Corrugated Filter

Design Tips

Use Spurious Pass-Bands Calculator
Use WR-Connect Design Software
Design two corrugated filters covering the same pass-band but having different layout of spurs.
Cut the filters in the middle and connect two halves from different filters
Optimize the pass-band until it meets requirements

PARAMETER	PERFORMANCE	NOTES
Pass-Band, GHz	12.0 - 13.0
Insertion Loss, dB	0.11	Silver plated, Ambient, 28 dB RL
Return Loss, dB (VSWR)	28 (1:1.08) 24 (1:1.14) 21 (1:1.20)	EDM Milling +/-0.0005'', R0.032'' Milling +/-0.001'', R 0.064''
Rejection, dB	See Plots	Spurious modes taken into account
Peak Power Handling, W In Space (multipaction) On Ground (air breakdown)	10000 150000	By analysis (0.12'' minimum gap)
Size, inches	1.5 x 1.5 (WR75 Flange) x 4.0 (Length)	Space for flanges included
Mass, g	90	Aluminum
Production method	Milling or EDM preferred Die casting possible	See tolerances above

Figure 1: Insertion loss response: transmission (dB) versus frequency (GHz)

Figure 2: TE10-mode response: reflection and transmission (dB) versus frequency(GHz)

Figure 3: TE20-mode (first spurious mode) response: reflection and transmission (dB) versus frequency (GHz)

Figure 4: TE30-mode (second spurious mode) response: reflection and transmission (dB) versus frequency (GHz)