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clear;clc;close all;
rho1=2.8;
beta1=3.0;
miu1=beta1^2*rho1;
rho2=3.2;
beta2=5.0;
miu2=beta2^2*rho2;
h=10;
%phase velocity dispersion
c=5:-0.01:3.05;
omega=atan(miu2/miu1*sqrt(1./c.^2-1/beta2^2)./sqrt(1/beta1^2-1./c.^2))./(h*sqrt(1/beta1^2-1./c.^2));
f=omega/(2*pi);
h(1)=plot(f,c,"LineWidth",2);hold on;
%group velocity dispersion