MTCROWAVE REPEATER RESEARCH 



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circuit can insert energy lying within the band of the reflection filters into 

 the main line without disturbing any energy passing through it at other 

 frequencies. 



A 

 Fig. IV-5. — Hybrid junction used in the filter of Fig. IV-4. 



-PREQUENCY ADJUSTED 

 BY SIDE SCREWS 



Fig. IV-.6 — Waveguide band reflection filter used in the filter of Fig. IV-4. 



An embodiment of the circuit of Fig. IV-4 suitable for use in the repeater 

 arrangement of Fig. IV- 1 has been constructed and tested. Figure IV-5 

 illustrates the waveguide hybrid employed. Here the waveguide opening 



