MATLAB: How to get single passband elliptical function over the whole band using ellip and freqz

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 I am trying to get an elliptic bandpass response with single pass-band over the whole unit circle from [0 to 2*pi], using ellip and freqz functions, but I am getting two passbands
Here is the code I get:
%Shifted frequency range that hosts the passband
alpha=[15e9 75e9]/120e9; 
%Elliptical Bandpass Filter design
[b,a] = ellip(2,0.5,30,alpha,'bandpass',s);
%Frequency Selective Response
FSR=20*10^9;
%The unit delay 
T=1/(FSR);
%Obtaining Elliptical Bandpass filter matrix
[O1,w] = freqz(b,a,81,'whole');

Best Answer

 Thank you Star Strider for your feedback, it worked with me, I highly appreciate your cooperation.
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