RF Wave Toolbox: si(xo) - File Exchange

Code covered by the BSD License

Highlights from
RF Wave Toolbox

[att,rf]=obloss(d,do,f,h,rc)
[uazx,uazy,uaxy]=plnarray(uel... PARRAY Provides the radiation intensity for a uniform planar
[ue,uh,ga]=corner(d,alfa,uef,...
cfresnel(xo) CFRESNEL is the Fresnel cosine integral function.
ci(xo)
collin(d,ld,a,vd)
cylcav(a,d,mode,er,sgr)
cylwg(a,L,mode,er,fo,sgr) CYLWG Provides the cutoff frequency FC in GHz, modal impedance
darray(d,ld,a,vd)
dbstub(zl,zo,zd,lt1,lt2,d1,d2... DBSTUB Provides VSWR, reflection coefficient and input impedance
dbstubs(zl,zo,zd,d1,d2) DBSTUBS Provides the stub lengths LT1 near the load and LT2 near
dipimp(d,ld,a,vd,type) DIPIMP Provides the input impedances ZIN and feeding current IIN
dipole(l,a,tho) DIPOLE Provides the radiation intensity U, input impedance ZIN
fdipole(l,a,d,C,f,zd) FDIPOLE Provides VSWR, reflection coefficient and input impedance
fdipoles(a,f,zd) FDIPOLES Provides the dipole length in meters and the capacitors
friis(type,pin,d,f,ga,att,do,...
gmatch(ld,lg,ad,ag,d,C,f,zd) GMATCH Provides VSWR, reflection coefficient and input impedance
gmatchs(l,a,d,f,zd) GMATCHS Provides the gamma rod length in meters and the capacitor
hata(fc,hte,hre,d,type)
helical(d,alp,n)
helicals(ga,zin) HELICALS Provides the diameter D and turn spacing S in wavelength,
impcol(h,l) IMPMUT Provides the mutual impedance between dipoles placed
larray(u,d,psia,n) LARRAY Provides the radiation intensity UA for an uniform linear
logpers(ga,fmin,fmax,zin)
mstrip(zo,er) MSTRIP Provides the ratio line width - substrate thickness W and
mutimp(d,l1,l2,type) MUTIMP Provides the mutual impedance between dipoles placed side
netmatch(spv,npv,opt) NETMATCH provides design parameters for one stage RF amplifier.
omatch(ld,lg,ad,ag,d,Cs,Cp,f,... OMATCH Provides VSWR, reflection coefficient and input impedance
omatchs(l,a,d,f,Cp,zd) OMATCHS Provides the gamma rod length in meters and the series
parab(d,f,sg) PARAB Provides the radiation intensity U, the antenna gain GA
parabs(ga,sg)
qwtrafo(zl,zo,zd,bw) QWTRAFO Provides VSWR, reflection coefficient and input impedance
qwtrafos(zl,zd,n) ZOIMP Provides the characteristic impedances for N quarter-wave
radar(type,pin,d,f,ga,att,ae)
radpat(u,type) RADPAT Plots the antenna's radiation pattern using the radiation
retcav(a,b,d,l,m,er,sgr)
retwg(a,b,l,mode,er,fo,sgr) RETWG Provides the cutoff frequency FC in GHz, modal impedance
sfresnel(xo) SFRESNEL is the Fresnel sine integral function.
si(xo)
smithch(zl,zo,zin) SMITHCH Plots the Smith Chart with option to pinpoint normalized
stub(zl,zo,zd,l,lt,st,bw) STUB Provides VSWR, reflection coefficient and input impedance
stubs(zl,zo,zd,st) STUBS Provides the line lengths L and stub length LT.
tmatch(ld,lt,ad,at,d,C,f,zd) TMATCH Provides VSWR, reflection coefficient and input impedance
tmatchs(l,a,d,f,zd) TMATCHS Provides the T rods lengths in meters and the capacitors
tristub(zl,zo,zd,lt1,lt2,lt3,... TRISTUB Provides VSWR, reflection coefficient and input impedance
tristubs(zl,zo,zd,d1,d2) TRISTUBS Provides the stub lengths LT1, near the load, LT3 near
txline(zl,zo,zd,l,bw) TXLINE Provides VSWR, reflection coefficient and input impedance
yagi(d,ld,a)
zoimp(type,a,b,er,ltan,fo) ZOIMP Provides the characteristic impedance and attenuation
rfwave.m
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from RF Wave Toolbox by Antonio Cezar de Castro Lima
Transmission lines and antennas analysis and design.

si(xo)

% SI       is the sine integral function.
%
%	       Y = SI(X) for 0 < X < 100
%

% RFWave - The Radio Frequency Wave Toolbox
% Versions: 1.0 22-May-1997, 1.1 18-Aug-1999,
%           1.2 16-Jul-2002
% Developed by A. C. de C. Lima 
% E-mail: acdcl@ufba.br
% Electrical Engineering Department
% Federal University of Bahia (UFBA)
% Brazil

function y = si(xo)

xo(xo==0)=eps;
sxo=size(xo);
y=zeros(sxo);
for i=1:length(xo),
    x=0:xo(i)/1000:xo(i);
    y(i)=trapz(x,sinc(x/pi));
end

Highlights from RF Wave Toolbox

Highlights from
RF Wave Toolbox