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{
"metadata": {
"name": "",
"signature": ""
},
"nbformat": 3,
"nbformat_minor": 0,
"worksheets": [
{
"cells": [
{
"cell_type": "heading",
"level": 1,
"metadata": {},
"source": [
"chapter 05 : Practical Antennas-I"
]
},
{
"cell_type": "heading",
"level": 2,
"metadata": {},
"source": [
"Exa 5.1 : page 5.57"
]
},
{
"cell_type": "code",
"collapsed": false,
"input": [
"from math import pi\n",
"#For Single Turn:\n",
"from sympy import symbols, sqrt\n",
"lamda = symbols('lamda')\n",
"a=lamda/25\n",
"A=pi*pow(a,2)\n",
"Rr = (A/lamda**2)**2*31171.2\n",
"print \"radiation Resistance =\",round(Rr,4),\"Ohm for single turn \"\n",
"\n",
"#For Eight Turn:\n",
"N=8 #no. of turns\n",
"Rr=Rr*N**2 #in Ohm\n",
"print \"radiation Resistance = %0.2f Ohm for Eight turn \" %Rr"
],
"language": "python",
"metadata": {},
"outputs": [
{
"output_type": "stream",
"stream": "stdout",
"text": [
"radiation Resistance = 0.7876 Ohm for single turn \n",
"radiation Resistance = 50.40 Ohm for Eight turn \n"
]
}
],
"prompt_number": 26
},
{
"cell_type": "heading",
"level": 2,
"metadata": {},
"source": [
"Exa 5.2 : page 5.58"
]
},
{
"cell_type": "code",
"collapsed": false,
"input": [
"from math import pi, acos, sqrt \n",
"#Given data :\n",
"f=20.0 #in MHz\n",
"N=15.0 #No. of turns\n",
"A=2.0 #in m**2\n",
"Vrms=200.0 #in uV\n",
"theta=acos(1) #in radian\n",
"mu_o=4*pi*10**-7 #in H/m\n",
"#Formula : Vm=2*pi*f*mu_o*H*A*N\n",
"Vm=Vrms*sqrt(2) #in uV\n",
"H=(Vm*10**-6)/(2.0*pi*f*10**6*mu_o*A*N) #in A/m\n",
"print \"Peak Value of magnetic feld intensity = %0.3e mA/m \" %(H*1000) \n",
"#Note : Answer in the book is wrong."
],
"language": "python",
"metadata": {},
"outputs": [
{
"output_type": "stream",
"stream": "stdout",
"text": [
"Peak Value of magnetic feld intensity = 5.970e-05 mA/m \n"
]
}
],
"prompt_number": 32
},
{
"cell_type": "heading",
"level": 2,
"metadata": {},
"source": [
"Exa 5.3 : page 5.58"
]
},
{
"cell_type": "code",
"collapsed": false,
"input": [
"from math import sqrt\n",
"#Given data :\n",
"f=20 #in MHz\n",
"f=f*10**6 #in Hz\n",
"Wmax=25 #in mW/m**2\n",
"A=10.0 #in m**2\n",
"c=3*10**8 #speed of light in m/s\n",
"lamda=c/f #in meter\n",
"Rr=31171.2*(A/lamda**2)**2 #iin Ohm\n",
"#Formula : Wmax=V**2/(4*Rr)\n",
"V=sqrt(Wmax*10**-3*4*Rr) #in Volts\n",
"print \"Maximum emf in the loop = %0.3f Volts \"%V "
],
"language": "python",
"metadata": {},
"outputs": [
{
"output_type": "stream",
"stream": "stdout",
"text": [
"Maximum emf in the loop = 2.481 Volts \n"
]
}
],
"prompt_number": 35
},
{
"cell_type": "heading",
"level": 2,
"metadata": {},
"source": [
"Exa 5.4 : page 5.59"
]
},
{
"cell_type": "code",
"collapsed": false,
"input": [
"from math import pi\n",
"#Given data :\n",
"N=20.0 #turns\n",
"D=1.0 #in meter\n",
"r=D/2 #in meter\n",
"E=200*10**-6 #in V/m\n",
"L=50*10**-6 #in H\n",
"R=2.0 #in Ohm\n",
"f=1.5 #in MHz\n",
"f=f*10**6 #in Hz\n",
"c=3*10**8 #speed of light in m/s\n",
"lamda=c/f #in meter\n",
"A=pi*r**2 #in m**2\n",
"Vrms=2*pi*E*A*N/lamda #in Volts\n",
"Q=2*pi*f*L/R #unitless\n",
"Vc_rms=Vrms*Q #in Volts\n",
"print \"Voltage across the capacitor = %0.2f mV\" %(Vc_rms*1000) \n",
"#Note : Answer in the book is wrong."
],
"language": "python",
"metadata": {},
"outputs": [
{
"output_type": "stream",
"stream": "stdout",
"text": [
"Voltage across the capacitor = 23.25 mV\n"
]
}
],
"prompt_number": 36
},
{
"cell_type": "heading",
"level": 2,
"metadata": {},
"source": [
"Exa 5.5 : page 5.59"
]
},
{
"cell_type": "code",
"collapsed": false,
"input": [
"from math import pi, cos\n",
"#Given data :\n",
"N=100 #No. of turns\n",
"A=2 #in m**2\n",
"f=10 #in MHz\n",
"f=f*10**6 #in Hz\n",
"Q=150 #Quality factor\n",
"c=3*10**8 #speed of light in m/s\n",
"lamda=c/f #in meter\n",
"Erms=10*10**-6 #in V/m\n",
"theta=60 #in degree\n",
"Vrms=2*pi*Erms*A*N*cos(theta*pi/180)/lamda \n",
"Vin=Vrms*Q #in Volts\n",
"print \"Voltage to the receiver = %0.1f mV \" %(Vin*1000) \n",
"#Note : Answer in the book is wrong."
],
"language": "python",
"metadata": {},
"outputs": [
{
"output_type": "stream",
"stream": "stdout",
"text": [
"Voltage to the receiver = 31.4 mV \n"
]
}
],
"prompt_number": 40
}
],
"metadata": {}
}
]
}
|
