|  | Octave-Wcalc: microstrip_syn 
 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)PARAMETERSINPUT PARAMETERS
z0
: desired characteristic impedance (Ohms)w
: width of microstrip line (meters)h
: substrate thickness (meters)l
: lentgh of microstrip line (meters)tmet
: metal thickness (meters)rho
: resistivity of the metalization (relative to copper)rough
: conductor surface roughness (meters-rms)er
: substrate relative permitivittytand
: substrate loss tangentf
: synthesis frequency (Hz)flag
: indicates which parameters should be optimized
    
flag=1 : synthesize the metal widthflag=1 : synthesize the substrate thicknessflag=2 : synthesize the substrate dielectric constantflag=3 : synthesize the metal length OUTPUT VALUES
w_out
: Calculated width of microstrip line (meters)h_out
: Calculated height of microstrip line (meters)l_out
: Calculated length of microstrip line (meters)er_out
: Calculated substrate relative permitivitty of microstrip line 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 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
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