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{
"metadata": {
"name": "chapter 12.ipynb"
},
"nbformat": 3,
"nbformat_minor": 0,
"worksheets": [
{
"cells": [
{
"cell_type": "heading",
"level": 1,
"metadata": {},
"source": [
"Chapter 12: Aperture Antennas"
]
},
{
"cell_type": "heading",
"level": 2,
"metadata": {},
"source": [
"Example 12.2, Page no. 675"
]
},
{
"cell_type": "code",
"collapsed": false,
"input": [
"import math\n",
"#Assume lamda = 50\n",
"lamda=50.0\n",
"a=3*lamda\n",
"b=2*lamda\n",
"n=1\n",
"\n",
"theta_1=114.6*(math.asin(n*lamda/b))\n",
"print \"First Null Beamwidth:\",theta_1,\"deg\"\n",
"\n",
"theta_h=114.6*math.asin(0.443*lamda/b)\n",
"print \"Half-power beamwidth:\",theta_h,\"deg\"\n",
"\n",
"theta_s=114.6*math.asin(1.43*lamda/b)\n",
"print \"First Sidelobe Beamwidth:\",theta_s,\"deg\"\n",
"\n",
"E_s=0.217\n",
"print \"Maximum of first side lobe:\",20*log10(E_s),\"dB\"\n",
"\n",
"D0=4*pi*a*b/lamda**2\n",
"print \"Maximum directivity:\",10*log10(D0),\"dB\""
],
"language": "python",
"metadata": {},
"outputs": [
{
"output_type": "stream",
"stream": "stdout",
"text": [
"First Null Beamwidth: 60.0044196836 deg\n",
"Half-power beamwidth: 25.5961863013 deg\n",
"First Sidelobe Beamwidth: 91.2931226067 deg\n",
"Maximum of first side lobe: -13.270805323\n",
"Maximum directivity: 18.7736111441 dB\n"
]
}
],
"prompt_number": 9
},
{
"cell_type": "heading",
"level": 2,
"metadata": {},
"source": [
"Example 12.4, Page no. 683"
]
},
{
"cell_type": "code",
"collapsed": false,
"input": [
"#Given \n",
"lamda=50.0\n",
"\n",
"#For a=b=20*lamda\n",
"print \"For a=b=20*lamda, the efficiency for the uniform aperture is 94%.\"\n",
"\n",
"a=b=3*lamda\n",
"k=2*pi/lamda\n",
"theta1=10*pi/180\n",
"u=(k*a/2)*sin(theta1)\n",
"\n",
"print \"For u = %f, the efficiency is 58.\"%u"
],
"language": "python",
"metadata": {},
"outputs": [
{
"output_type": "stream",
"stream": "stdout",
"text": [
"For a=b=20*lamda, the efficiency for the uniform aperture is 94%.\n",
"For u = 1.636596, the efficiency is 58.\n"
]
}
],
"prompt_number": 4
},
{
"cell_type": "heading",
"level": 2,
"metadata": {},
"source": [
"Example 12.5, Page no. 696"
]
},
{
"cell_type": "code",
"collapsed": false,
"input": [
"#Given \n",
"lamda=50.0\n",
"theta=30*pi/180\n",
"a_sq=b_sq=lamda/(2*sin(theta))\n",
"D0=pi/sin(theta)**2\n",
"print \"Directivity of square patch is : %f dB\" %(10*log10(D0))\n",
"\n",
"a_cir=lamda/(3.413*sin(theta))\n",
"D0cir=(1.079*pi)/(sin(theta)**2)\n",
"print \"Directivity of circular patch is : %f dB\" %(10*log10(D0cir))"
],
"language": "python",
"metadata": {},
"outputs": [
{
"output_type": "stream",
"stream": "stdout",
"text": [
"Directivity of square patch is : 10.992099 dB\n",
"Directivity of circular patch is : 11.322313 dB\n"
]
}
],
"prompt_number": 5
},
{
"cell_type": "heading",
"level": 2,
"metadata": {},
"source": [
"Example 12.6, Page no. 699"
]
},
{
"cell_type": "code",
"collapsed": false,
"input": [
"#Given\n",
"Zc=73+42.5j #Characteristic impedance\n",
"eta=376.7\n",
"\n",
"Zs=eta**2/(4*Zc)\n",
"print \"Terminal(input) impedance od the slot:\",Zs,\"Ohms\""
],
"language": "python",
"metadata": {},
"outputs": [
{
"output_type": "stream",
"stream": "stdout",
"text": [
"Terminal(input) impedance od the slot: (362.948424022-211.305589328j) Ohms\n"
]
}
],
"prompt_number": 7
}
],
"metadata": {}
}
]
}
|
