MAXIMALLY-FLAT FILTERS IN WAVEGUIDE 



707 



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 FREQUENCY IN MC 



Fig. 22 — Measured standing wave ratio of maximally-flat filter consisting of fifteen 

 resonant cavities. 



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FREQUENCY IN MC 



Fig. 23 — Measured insertion loss of the fifteen-cavity filter. 



view of the difficulties that might be encountered in constructing and align- 

 ing a filter consisting of 75 discontinuities and 29 lengths of waveguide. 

 Its physical length (over 80") may be seen in the photograph of Fig. 24. 



