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Mex-Wcalc: coax_calc
coax_calc - Coaxial transmission line analysis
SYNOPSIS
[L, R, C, G, lc, ld, fc, em] =
coax_calc(a, b, c, t, rho_a, rho_b, er, tand, len, f)
PARAMETERSINPUT PARAMETERS
- a
: radius of inner conductor (meters)
- b
: inner radius of outer conductor (meters)
- c
: offset of the inner conductor from the center (meters)
- t
: thickness of shield (meters)
- rho_a
: resistivity of inner conductor (ohms/meter)
- rho_b
: resistivity of outer conductor (ohms/meter)
- er
: relative permitivitty of dielectric
- tand
: loss tangent of dielectric
- len
: physical length of line (meters)
- f
: analysis frequency (Hertz)
OUTPUT VALUES
- L
: calculated inductance per length (Henries/meter)
- R
: calculated resistance per length (Ohms/meter)
- C
: calculated capacitance per length (Farads/meter)
- G
: calculated conductance per length (Siemens/meter)
- lc
: conductor loss (dB/meter)
- ld
: dielectric loss (dB/meter)
- fc
: TE10 cutoff frequency (Hz)
- em
: Max Electric Field (Volts/meter)
DESCRIPTION
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.
EXAMPLE % 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));
SEE ALSOair_coil_calc
air_coil_syn
coax_calc
coax_syn
coupled_microstrip_calc
coupled_microstrip_syn
ic_microstrip_calc
ic_microstrip_syn
microstrip_calc
microstrip_syn
stripline_calc
stripline_syn
AUTHOR
Dan McMahill
BUGS
None known
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