Use of gauspuls command in matlab, unable to broad signal at frequency spectrum

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Kunal Khosla
Kunal Khosla 2019-4-26
I have a doubt in the gauspuls command in matlab, i entered a fbr(fractional bandwidth of 1.5,ie. bandwidth= 0.75Mhz ) but as i plot the signal in the frequency spectrum using fft. i dont see the signal being broad enough. Why is that. the code is shown below: the below code also has general parameters as follows: dt comes out to be 0.0088us.
%% General parameters %%%
dx=0.05; % mm
Vmax=4.0; % mm/us
alpha=0.99;
dt=alpha*dx/(sqrt(2)*Vmax);% µs
f0=0.5; % central frequency, MHz
t0=1.5; % pulse center time
bndwdth=1.5; % pulse -6dB bandwidth
duration=2*t0; % signal length
timebase=(0:round(duration/dt)-1)'*dt;
[signalI,signalQ,signalE]=gauspuls(timebase-t0,f0,bndwdth);
signal=signalQ;
signal=signal/max(signal);
figure(2)
plot(timebase,signal,'.-')
title('source signal')
xlabel('time (µs)')
fs=1e6;
figure(3)
n=length(signal);
f = fs*(0:n)/n;
Y=fft(signal);
Y=Y';
plot(f,abs(Y))
title('Single-Sided Amplitude Spectrum of y(t)')
xlabel('Frequency (Hz)')
ylabel('|Y(f)|')
Shown below are the plots:
untitled.png

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