Function to analyze the electrical characteristics of a coaxial transmission line. The physical dimensions of the line are given as inputs and the characteristic impedance and incremental circuit model elements are calculated.
// mils to meters conversion factor
sf=25.4e-6;
// radius of inner conductor
a=10.0*sf;
// inner radius of outer conductor
b=100.0*sf;
// offset of inner conductor
c=0*sf;
// thickness of outer conductor
t=5.0*sf;
// resistivity of inner conductor
rho_a=3.5e-8;
// resistivity of outer conductor
rho_b=rho_a;
// relative permitivitty of dielectric
er=9.5;
// dielectric loss tangent
tand=0.01;
// length of line
len=1.0;
// 100 MHz operation
f=100e6;
[z0,elen,loss,L,R,C,G,lc,ld,fc,em] = coax_calc(a,b,c,t,rho_a,rho_b,er,tand,len,f);
disp(sprintf('z0 = %g Ohms',z0));
disp(sprintf('elen = %g degrees',elen));
disp(sprintf('loss = %g dB',loss));
disp(sprintf('L = %g H/m',L));
disp(sprintf('R = %g Ohms/m',R));
disp(sprintf('C = %g F/m',C));
disp(sprintf('G = %g S/m',G));
disp(sprintf('Conductor loss = %g dB/m', lc));
disp(sprintf('Dielectric loss = %g dB/m', ld));
disp(sprintf('TE10 cutoff = %g GHz', fc/1e9));
disp(sprintf('Max E field = %g kV/m', em/1e3));
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Dan McMahill
None known
Please report any bugs on the Wcalc Sourceforge Project Page