KONKAN GYANPEETH COLLEGE
1 OF ENGINEERING, KARJAT
Affiliated to University of Mumbai, Approved by A.I.C.T.E. , New Delhi
KonkanGyanpeethShaikshanikSankul, Vengaon Road, Dahivali Karjat, Dist: Raigad 410201
DEPARTMENT OF EXTC
Experiment5
Aim: Write a scilab code to Design a lossless horn antenna
with directivity 20dB at a frequency of 10 GHz
Software :version Scilab 5.5.2
Construction & Working of Horn Antenna
The energy of the beam when slowly transform into radiation, the losses are reduced and the
focussing of the beam improves. A Horn antenna may be considered as a flared out wave
guide, by which the directivity is improved and the diffraction is reduced.
The energy of the beam when slowly transform into radiation, the losses are reduced and
the focussing of the beam improves. A Horn antenna may be considered as a flared out
wave guide, by which the directivity is improved and the diffraction is reduced.
Pyramidal horn (a, right) – a horn antenna with the horn in the shape of a four-sided
pyramid, with a rectangular cross section. They are a common type, used with rectangular
waveguides, and radiate linearly polarized radio waves.[12]
Sectoral horn – A pyramidal horn with only one pair of sides flared and the other pair
parallel. It produces a fan-shaped beam, which is narrow in the plane of the flared sides,
but wide in the plane of the narrow sides. These types are often used as feed horns for wide
search radar antennas.
E-plane horn (b) – A sectoral horn flared in the direction of the electric or E-field in the
waveguide.
H-plane horn (c) – A sectoral horn flared in the direction of the magnetic or H-field in the
waveguide.
Horns have very little loss, so the directivity of a horn is roughly equal to its gain.[1] The
gain G of a pyramidal horn antenna (the ratio of the radiated power intensity along its beam
axis to the intensity of aHorns have very little loss, so the directivity of a horn is roughly
equal to its gain.[1] The gain G of a pyramidal horn antenna (the ratio of the radiated
power intensity along its beam axis to the intensity of an isotropic antenna with the same
input power) is:[18]
Horns have very little loss, so the directivity of a horn is roughly equal to its gain.[1] The
gain G of a pyramidal horn antenna (the ratio of the radiated power intensity along its beam
axis to the intensity of an isotropic antenna with the same input power)
KONKAN GYANPEETH COLLEGE
2 OF ENGINEERING, KARJAT
Affiliated to University of Mumbai, Approved by A.I.C.T.E. , New Delhi
KonkanGyanpeethShaikshanikSankul, Vengaon Road, Dahivali Karjat, Dist: Raigad 410201
KONKAN GYANPEETH COLLEGE
3 OF ENGINEERING, KARJAT
Affiliated to University of Mumbai, Approved by A.I.C.T.E. , New Delhi
KonkanGyanpeethShaikshanikSankul, Vengaon Road, Dahivali Karjat, Dist: Raigad 410201
//AIM: D e sig n a l o s s l e s s ho rn a n t e n na wi t h directivity
20dB at a frequency of 20GHz
Scilab code:
f= 10 * 10 ^ 9 ; // Frequency
c=3 * 10 ^ 8 ; // Speed of light
Do =20; // D i r e c t i v i t y ( in dB)
d0 =10^( Do /10)
disp (d0 ,'Dim e n s i o n l e s sd i r e c t i v i t y(dB)=');
lambda =c/ f;// Computing the wavelength
disp ( lambda , 'lambda in m=');
// Computing the maximum e f f e c t i v e a p e r t u r e (Aem) :
Aem =(( lambda ^2)* do)/(4* %pi);
disp (Aem ,'Maximum e f f e c t i v e a p e r tu r e in m*2, Aem=' );
// Computing the maximum power r e c e i v e d : Pr
disp ( f,' Frequency=');
Wi =2*10^ -3; // I n c i d e n t power d e n s i t y
Pr= Aem * Wi;
disp ( Pr ,"Maximum power r e c e i v e d in Watt (Pr)=");
Result/conclusion:
