A SINGLE BAND ACOUSTIC WAVE FILTER 
G. W. STEWART 
{ABSTRACT) 
Theoretical considerations lead to the conclusion that a single 
band acoustic wave filter can be made in a manner analagous to 
the electric wave filter and also that in the acoustic case there 
should be a repetition of the band at high frequencies. The ac- 
companying drawing (Fig. 18) shows the results of experiments 
with two filters whose dimensions also are indicated. 
The transmission band is computed from the following formula 
giving the limiting frequencies : 
(2 7r/i)2 = a2 
(2 TT /2)2 = a2 
(S^ k + Sih\ 
V h V 2 h ) 
wherein and are the computed limits of the band, ,^2 is the 
area of the side tubes. is the area of the conducting tube. 
