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{
"metadata": {
"name": ""
},
"nbformat": 3,
"nbformat_minor": 0,
"worksheets": [
{
"cells": [
{
"cell_type": "heading",
"level": 1,
"metadata": {},
"source": [
"Chapter 14 Antennas"
]
},
{
"cell_type": "heading",
"level": 2,
"metadata": {},
"source": [
"Example 14.1 Page no 669"
]
},
{
"cell_type": "code",
"collapsed": false,
"input": [
"#given\n",
"c=3*10**8 #m/s , speed of light \n",
"f=150*10**6 #frequency\n",
"\n",
"#calculation\n",
"h=c/f\n",
"x=1/2.0 #antennas dimension(D)\n",
"D=0.5*2\n",
"Rff=5*D\n",
"h=c/f \n",
"D = h/2\n",
"\n",
"#result\n",
"print\" distance =\",Rff,\"m\"\n"
],
"language": "python",
"metadata": {},
"outputs": [
{
"output_type": "stream",
"stream": "stdout",
"text": [
" distance = 5.0 m\n"
]
}
],
"prompt_number": 2
},
{
"cell_type": "heading",
"level": 2,
"metadata": {},
"source": [
"Example 14.2 Page no 669"
]
},
{
"cell_type": "code",
"collapsed": false,
"input": [
"#given\n",
"c=3*10**8 #velocity of light\n",
"f=12.0*10**9 #frequency\n",
"D=4.5 #diameter of parabolic reflector\n",
"\n",
"#calculation\n",
"h=c/f #wavelength\n",
"x=D/h\n",
"R=(2*D**2)/h\n",
"\n",
"#result\n",
"print\"distance from parabolic reflector= \",R,\"m\""
],
"language": "python",
"metadata": {},
"outputs": [
{
"output_type": "stream",
"stream": "stdout",
"text": [
"distance from parabolic reflector= 1620.0 m\n"
]
}
],
"prompt_number": 3
},
{
"cell_type": "heading",
"level": 2,
"metadata": {},
"source": [
"Example 14.3 Page no 671"
]
},
{
"cell_type": "code",
"collapsed": false,
"input": [
"#given\n",
"Pt=10 #transmitted power\n",
"#dipoles have gain 2.15dB \n",
"Gr=1.64\n",
"c=3*10**8 #velocity of light\n",
"f=144.0*10**6 #frequency\n",
"d=50*10**3 #distance between antennas\n",
"Gt=1.64 #recieving antenna gain(ratio) compared to isotropic radiator\n",
"\n",
"#calculation\n",
"import math\n",
"Pr=Pt*Gt*Gr*(c/f)**2/((16*(math.pi)**2)*(d**2)) #power recieved\n",
"\n",
"#result\n",
"print\"Power received = \",round(Pr,12),\"w\"\n",
"\n"
],
"language": "python",
"metadata": {},
"outputs": [
{
"output_type": "stream",
"stream": "stdout",
"text": [
"Power received = 2.96e-10 w\n"
]
}
],
"prompt_number": 2
},
{
"cell_type": "heading",
"level": 2,
"metadata": {},
"source": [
"Example 14.4 Page no 674"
]
},
{
"cell_type": "code",
"collapsed": false,
"input": [
"#Given\n",
"c=3*10**8 #velocity of light\n",
"f=100*10**6 #frequency\n",
"\n",
"#Calculation\n",
"h=c/f #wavelength\n",
"x=h/2.0 #dipole i.e h/2\n",
"l=0.95*x #applying 95% correction,the actual optimum physical length\n",
"L=486/100.0 #alternative method to find length\n",
"\n",
"#Result\n",
"print\"length of antenna = \",l,\"m\"\n"
],
"language": "python",
"metadata": {},
"outputs": [
{
"output_type": "stream",
"stream": "stdout",
"text": [
"length of antenna = 1.425 m\n"
]
}
],
"prompt_number": 1
}
],
"metadata": {}
}
]
}
|
