c 

 2r 



3 



01 



0-01 



R 



/ 



r 



X 



A^A a'^ ^R 10^ 



XT 



'TT 



Single section Two equal sections Tapered sections- 



approximation to 



ideal 



J I I I I III 



I I I I I f ' 



CD 

 ■D 



001/C/? Q-yCR VCR ]Q/CR m/CR 



Graph 11. Performance of cascaded R-C sections 



001/C/?' 



10/C9' 100/C/?' 



Graph 12. Transmission characteristic of limited phase shift filters 



0-1/C/?' \/CR' 



u) increasing 



268 



