Mex-Wcalc: coupled_microstrip_calc
Description: Wcalc: A transmission line calculator
Keywords: coupled microstrip, coupled microstrip analysis, coupled microstrip synthesis, microstrip, microstrip analysis, microstrip synthesis, stripline, stripline analysis, stripline synthesis,

| Mex-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) ## PARAMETERS ### INPUT 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 permitivitty tand : substrate loss tangent f : analysis frequency (Hz) ### OUTPUT VALUES z0 : calculated characteristic impedance (Ohms) k : calculated coupling coefficient z0e : calculated even mode characteristic impedance (Ohms) z0o : calculated odd mode characteristic impedance (Ohms) kev : calculated even mode effective relative permitivitty kev : calculated odd mode effective relative permitivitty loss : 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 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 Return to the MEX-Wcalc page.
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Air Core Solenoid Inductor Coaxial Transmission Line Coupled Microstrip Integrated Circuit Microstrip Microstrip Stripline
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