|  | Octave-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 dielectrictand
: loss tangent of dielectriclen
: 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_calcair_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
 Return to the Octave-Wcalc page. |