Stdio-Wcalc: microstrip

Stdio-Wcalc: microstrip_syn

microstrip_syn - Single microstrip transmission line synthesis

SYNOPSIS

microstrip_syn z0 w h l tmet rho rough er tand f flag

PARAMETERS

INPUT 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 permitivitty
tand : substrate loss tangent
f : synthesis frequency (Hz)
flag : indicates which parameters should be optimized
- flag=1 : synthesize the metal width
- flag=1 : synthesize the substrate thickness
- flag=2 : synthesize the substrate dielectric constant
- flag=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

* Z0 = 30 Ohms, er=2.55, f=1 MHz
microstrip_syn 30.0 90.0 5.678e-3 1e-3 1.0 3e-5 1.72e-8 0.0 2.55 0.0 1e6  0
* Z0 = 30 Ohms, er=2.55, f=10 GHz
microstrip_syn 30.0 90.0 5.558e-3 1e-3 1.0 3e-5 1.72e-8 0.0 2.55 0.0 1e10 0
* Z0 = 30 Ohms, er=9.6, f=1 MHz
microstrip_syn 30.0 90.0 2.395e-3 1e-3 1.0 3e-5 1.72e-8 0.0 9.60 0.0 1e6  0
* Z0 = 30 Ohms, er=9.6, f=10 GHz
microstrip_syn 30.0 90.0  2.201e-3 1e-3 1.0 3e-5 1.72e-8 0.0 9.60 0.0 1e10
*