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{
"metadata": {
"name": "",
"signature": "sha256:a1c5dc80edceb1c26296c5ed290e825905396ed6d9e62f8196824c971236a909"
},
"nbformat": 3,
"nbformat_minor": 0,
"worksheets": [
{
"cells": [
{
"cell_type": "heading",
"level": 1,
"metadata": {},
"source": [
"Chapter09, Horn Antenna"
]
},
{
"cell_type": "heading",
"level": 2,
"metadata": {},
"source": [
"Example No. 9.6.1, page : 9-8"
]
},
{
"cell_type": "code",
"collapsed": false,
"input": [
"from __future__ import division\n",
"f=2 #GHz(Frequency)\n",
"G=12 #dBi(Gain)\n",
"D=12 #dBi(Gain)\n",
"D=10**(D/10) #unitless(Directivity)\n",
"c=3*10**8 #m/s(speed of light)\n",
"lamda=c/(f*10**9) #m(wavelength)\n",
"Ap=D*lamda**2/7.5 #m\u00b2(capture area)\n",
"print \"Required capture area = %0.4f m\u00b2 \"%Ap "
],
"language": "python",
"metadata": {},
"outputs": [
{
"output_type": "stream",
"stream": "stdout",
"text": [
"Required capture area = 0.0475 m\u00b2 \n"
]
}
],
"prompt_number": 3
},
{
"cell_type": "heading",
"level": 2,
"metadata": {},
"source": [
"Example No. 9.6.2, page : 9-9"
]
},
{
"cell_type": "code",
"collapsed": false,
"input": [
"from math import sqrt, atan, pi, log10\n",
"aEBYlamda=10 #(Aperture/wavelength)\n",
"del_EBYlamda=0.2 #in E-plane\n",
"del_HBYlamda=0.375 #in H-plane\n",
"LBYlamda=aEBYlamda**2/8/del_EBYlamda #(Length/wavelength)\n",
"print \"Length of the horn is \",(LBYlamda),\"*lamda\" \n",
"aHBYlamda=sqrt(LBYlamda*8*del_HBYlamda) #(Aperture/wavelength)\n",
"print \"H-plane aperture, aH is \",round(aHBYlamda,2),\"*lamda\" \n",
"theta_E=2*atan(aEBYlamda/2/LBYlamda)*180/pi #degree(Angle)\n",
"theta_H=2*atan(aHBYlamda/2/LBYlamda)*180/pi #degree(Angle)\n",
"print \"Flare angles theta_E & theta_H = %0.2f & %0.2f degree \"%(theta_E,theta_H) \n",
"HPBW_E=56/aEBYlamda #degree(HPBW for E-plane)\n",
"print \"HPBW(E-plane) = %0.1f degree\"%(HPBW_E) \n",
"HPBW_H=67/aHBYlamda #degree(HPBW for H-plane)\n",
"print \"HPBW(H-plane) = %0.1f degree \" %HPBW_H \n",
"FNBW_E=102/aEBYlamda #degree(FNBW for E-plane)\n",
"print \"FNBW(E-plane) = %0.2f degree \" %FNBW_E \n",
"FNBW_H=172/aHBYlamda #degree(FNBW for F-plane)\n",
"print \"FNBW(H-plane) = %0.2f degree \"%FNBW_H \n",
"D=10*log10(7.5*aEBYlamda*aHBYlamda) #(Directivity)\n",
"print \"Directivity in dB : \", round(D,2)"
],
"language": "python",
"metadata": {},
"outputs": [
{
"output_type": "stream",
"stream": "stdout",
"text": [
"Length of the horn is 62.5 *lamda\n",
"H-plane aperture, aH is 13.69 *lamda\n",
"Flare angles theta_E & theta_H = 9.15 & 12.50 degree \n",
"HPBW(E-plane) = 5.6 degree\n",
"HPBW(H-plane) = 4.9 degree \n",
"FNBW(E-plane) = 10.20 degree \n",
"FNBW(H-plane) = 12.56 degree \n",
"Directivity in dB : 30.12\n"
]
}
],
"prompt_number": 14
}
],
"metadata": {}
}
]
}
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