Function to synthesize the physical dimenstions of a
coupled microstrip transmission line to achieve a desired characteristic
impedance and electrical length. The desired characteristic
impedance and some of the physical
dimensions of the coupled_microstrip line are given as inputs and the
remaining dimensions are calculated.
The line may be specified either in terms of an even mode and
odd mode characteristic impedance or a characteristic impedance and
coupling coefficient.
The model accounts for dispersion (frequency dependent propagation
velocity).
|<--W-->|<-S->|<--W-->|
_______ -------
| metal | | metal | <- rho,rough
----------------------------------------------
( dielectric /|\ (
) er,tand H | )
( \|/ (
----------------------------------------------
XXXXXXXXXXXXXXXXXX ground XXXXXXXXXXXXXXXXXXXX
// mils to meters conversion factor sf=25.4e-6; // desired impedance z0=75; // desired coupling k=0.3; // desired electrical length (degrees) elen=90; // width (we'll synthesize this) w=0; // spacing (we'll synthesize this) s=0; // height h=15*sf; // length l=1100*sf; // metal thickness tmet=1.4*sf; // resitivity of copper rho=1.72e-8; // metal surface roughness rough=0.05*sf; // relative dielectric constant er=4.5; // loss tangent tand=0.01; // frequency f=2.4e9; // synthesize from z0 and k (instead flag=0; // of z0e and z0o) [w_out,s_out,l_out] = ... coupled_microstrip_syn(z0,k,elen,w,s,h,l,tmet,rho,rough,er,tand,f,flag); disp(sprintf('w=%8.4g mils, s=%8.4g mils, l=%8.4g mils',w_out/sf,s_out/sf,l_out/sf));
air_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
Dan McMahill
None known