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{
"metadata": {
"name": "chapter 15.ipynb"
},
"nbformat": 3,
"nbformat_minor": 0,
"worksheets": [
{
"cells": [
{
"cell_type": "heading",
"level": 1,
"metadata": {},
"source": [
"Chapter 15: Reflector Antennas"
]
},
{
"cell_type": "heading",
"level": 2,
"metadata": {},
"source": [
"Example 15.3, Page no. 923"
]
},
{
"cell_type": "code",
"collapsed": false,
"input": [
"import math\n",
"import scipy.integrate\n",
"#Given\n",
"d=10.0\n",
"fd_ratio=0.5\n",
"f=3*10**9\n",
"v=3*10**8\n",
"lamda=float(v)/f\n",
"theta=math.atan((0.5*fd_ratio)/(fd_ratio**2-(1/16.)))\n",
"\n",
"eff=24*((sin(theta/2))**2+log(cos(theta/2)))**2*(1/tan(theta/2))**2\n",
"print \"Aperture Efficiency: %d\" %(100*eff)\n",
"\n",
"D=eff*((pi*d)/lamda)**2\n",
"print \"Total directivity: %f dB\" %(10*log10(D))\n",
"\n",
"spill_eff=(scipy.integrate.quad(lambda x:(cos(x*pi/180)**2)*sin(x*pi/180),0,53.13)[0])/(scipy.integrate.quad(lambda x:(cos(x*pi/180)**2)*sin(x*pi/180),0,90)[0])\n",
"print \"Spillover efficiency : %f \" %(100*spill_eff)\n",
"\n",
"taper_eff=2*eff/1.568\n",
"print \"Taper efficiency: %f\" %(100*taper_eff)\n",
"\n",
"m=pi/8\n",
"direc=(1-(m**2)/2)**2*D\n",
"print \"directivity for phase error of pi/8 : %f dB\" %(10*log10(direc))"
],
"language": "python",
"metadata": {},
"outputs": [
{
"output_type": "stream",
"stream": "stdout",
"text": [
"Aperture Efficiency: 75\n",
"Total directivity: 48.697528 dB\n",
"Spillover efficiency : 78.399846 \n",
"Taper efficiency: 95.749602\n",
"directivity for phase error of pi/8 : 48.000562 dB\n"
]
}
],
"prompt_number": 34
},
{
"cell_type": "heading",
"level": 2,
"metadata": {},
"source": [
"Example 15.4, Page no 936"
]
},
{
"cell_type": "code",
"collapsed": false,
"input": [
"#Given\n",
"v=3*3.28083*10**8\n",
"f=11.2*10**9\n",
"lamda=v/f\n",
"print \"wavelength: %f ft\" %lamda\n",
"delta=lamda/16\n",
"R=5\n",
"a=((14.7*(delta/lamda)*R**4)/(R/lamda))**(0.25)\n",
"print \"Maximum permissible aperture: %f feet\"%a"
],
"language": "python",
"metadata": {},
"outputs": [
{
"output_type": "stream",
"stream": "stdout",
"text": [
"wavelength: 0.087879 ft\n",
"Maximum permissible aperture: 1.782373 feet\n"
]
}
],
"prompt_number": 37
}
],
"metadata": {}
}
]
}
|
