microstrip_syn - Single microstrip transmission line synthesis

SYNOPSIS

[w_out, h_out, l_out, er_out] = microstrip_syn(z0, w, h, l, tmet, rho, rough, er, tand, f, flag)

PARAMETERS

INPUT PARAMETERS

OUTPUT VALUES

DESCRIPTION

Function to synthesize the physical dimenstions of a single microstrip transmission line to achieve a desired characteristic impedance and electrical length. The desired characteristic impedance and some of the physical dimensions of the microstrip line are given as inputs and the remaining dimensions are calculated.


                 |<--W-->|
                  _______    
                 | metal | <- rho,rough
    ----------------------------------------------
   (  dielectric                         /|\     (
    )   er,tand                       H   |       )
   (                                     \|/     (
    ----------------------------------------------
    XXXXXXXXXXXXXXXXXX ground XXXXXXXXXXXXXXXXXXXX


EXAMPLE

 // mils to meters conversion factor
sf=25.4e-6;
 // desired impedance
z0=75;
 // desired electrical length (degrees)
elen=90;
 // width (we'll synthesize this)
w=0;
 // height
h=62*sf;
 // length
l=1100*sf;
 // metal thickness
tmet=1.4*sf;
 // resitivity
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 width
flag=0;
[w_out,h_out,l_out,er_out] = ...
  microstrip_syn(z0,elen,w,h,l,tmet,rho,rough,er,tand,f,flag);
disp(sprintf('w=%g mils, l=%g mils',w_out/sf,l_out/sf));
disp(sprintf('er=%g',er_out));
disp(sprintf('z0=%g ohms, length=%g degrees',z0,elen));

SEE ALSO

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

AUTHOR

Dan McMahill

BUGS

None known