|  | Octave-Wcalc: coupled_microstrip_calc 
 coupled_microstrip_calc - Coupled microstrip transmission line analysis
 SYNOPSIS[z0, k, z0e, z0o, kev, kev, loss, deltal] = 
coupled_microstrip_calc(w, s, h, l, tmet, rho, rough, er, tand, f)PARAMETERSINPUT PARAMETERS
w
: width of coupled microstrip lines (meters)s
: spacing between coupled microstrip lines (meters)h
: substrate thickness (meters)l
: lentgh of coupled microstrip line (meters)tmet
: metal thickness (meters)rho
: resistivity of the metal (ohm-meters)rough
: conductor surface roughness (meters-rms)er
: substrate relative permitivittytand
: substrate loss tangentf
: analysis frequency (Hz) OUTPUT VALUES
z0
: calculated characteristic impedance (Ohms)k
: calculated coupling coefficientz0e
: calculated even mode characteristic impedance (Ohms)z0o
: calculated odd mode characteristic impedance (Ohms)kev
: calculated even mode effective relative permitivittykev
: calculated odd mode effective relative permitivittyloss
: calculated loss of the line (dB)deltal
: calculated open circuit end correction (meters) DESCRIPTION
Function to analyze the electrical characteristics of a 
coupled microstrip transmission line. The physical
dimensions of the coupled microstrip line are given as inputs and the
characteristic impedance, effective dielectric constant, loss and
open circuit end correction are calculated.
The model accounts for dispersion (frequency dependent propagation
velocity).
              |<--W-->|<-S->|<--W-->|
               _______       -------
              | metal |     | metal | <- rho,rough
    ----------------------------------------------
   (  dielectric                         /|\     (
    )   er,tand                       H   |       )
   (                                     \|/     (
    ----------------------------------------------
    XXXXXXXXXXXXXXXXXX ground XXXXXXXXXXXXXXXXXXXX
 EXAMPLE % mils to meters conversion factor
sf=25.4e-6;
 % width 
w=20*sf;
 % spacing
s=8*sf;
 % height
h=15*sf;
 % length
l=1100*sf;
 % metal thickness
tmet=1.4*sf;
 % resitivity relative to copper
rho=1;
 % metal surface roughness
rough=0.05*sf;
 % relative dielectric constant
er=4.5;
 % loss tangent
tand=0.01;
 % frequency
f=2.4e9;
[z0,k,z0e,z0o,kev,kodd] = ...
  coupled_microstrip_calc(w,s,h,l,tmet,rho,rough,er,tand,f);
disp(sprintf('z0=%g Ohms, k=%g',z0,k));
disp(sprintf('z0e=%g Ohms, z0o=%g Ohms',z0e,z0o));
disp(sprintf('kev=%g, kodd=%g',kev,kodd));
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. |