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{
"metadata": {
"name": ""
},
"nbformat": 3,
"nbformat_minor": 0,
"worksheets": [
{
"cells": [
{
"cell_type": "markdown",
"metadata": {},
"source": [
"<h1>Chapter 3: The Antenna Family<h1>"
]
},
{
"cell_type": "markdown",
"metadata": {},
"source": [
"<h3>Example 3-3.2, Page number: 58<h3>"
]
},
{
"cell_type": "code",
"collapsed": false,
"input": [
"#Variable declaration\n",
"Z_0 = 377 #Intrinsic impedence of free space(ohm)\n",
"Z_d = 710 +0j #Terminal impedence of dipole cylinder (ohm)\n",
"\n",
"#Calculation\n",
"Z_s = (Z_0**2)/(4*Z_d) #Terminal impedence of the slot (ohm)\n",
"\n",
"#Result\n",
"print \"The terminal impedence of the slot is\", round(Z_s.real), \"ohms\""
],
"language": "python",
"metadata": {},
"outputs": [
{
"output_type": "stream",
"stream": "stdout",
"text": [
"The terminal impedence of the slot is 50.0 ohms\n"
]
}
],
"prompt_number": 1
},
{
"cell_type": "markdown",
"metadata": {},
"source": [
"<h3>Example 3-6.1, Page number: 61<h3>"
]
},
{
"cell_type": "code",
"collapsed": false,
"input": [
"import math\n",
"\n",
"#Variable declaration\n",
"L = 10 #Horn length (lambda)\n",
"delta = 0.25 #Path length difference (lambda)\n",
"\n",
"#Calculation\n",
"theta = 2*math.acos(L/(L+delta)) #Horn flare angle (radians)\n",
"theta = theta*180/math.pi #Horn flare angle (degrees)\n",
"\n",
"\n",
"#Result\n",
"print \"The largest flare angle for given delta is\",round(theta,1), \"degrees\""
],
"language": "python",
"metadata": {},
"outputs": [
{
"output_type": "stream",
"stream": "stdout",
"text": [
"The largest flare angle for given delta is 25.4 degrees\n"
]
}
],
"prompt_number": 2
},
{
"cell_type": "markdown",
"metadata": {},
"source": [
"<h3>Example 3-7.1, Page number: 62<h3>"
]
},
{
"cell_type": "code",
"collapsed": false,
"input": [
"import math\n",
"\n",
"#Variable declaration\n",
"f = 599e6 #Frequency of TV Station (Hz)\n",
"E = 1e-6 #Field strength (V/m)\n",
"D = 20 #Diameter of antenna (m)\n",
"c = 3e8 #Speed of light (m/s)\n",
"Z_0 = 377 #Intrinsic impedence of free space (ohm) \n",
"\n",
"#Calculation\n",
"wave_lt = c/f #Wavelength (m)\n",
"A_e = (D*(wave_lt**2))/(4*math.pi) #Effective aperture (m^2)\n",
"P_r = (E**2)*A_e/Z_0 #Received power (W)\n",
"\n",
"#Result\n",
"print \"The received power is\", round(P_r,17), \"W\""
],
"language": "python",
"metadata": {},
"outputs": [
{
"output_type": "stream",
"stream": "stdout",
"text": [
"The received power is 1.06e-15 W\n"
]
}
],
"prompt_number": 4
},
{
"cell_type": "markdown",
"metadata": {},
"source": [
"<h3>Example 3-11.1, Page number: 66<h3>"
]
},
{
"cell_type": "code",
"collapsed": false,
"input": [
"import math\n",
"\n",
"#Variable declaration\n",
"n = 4 #Number of patch antennas (lambda)\n",
"diameter = 0.5 #diameter of patch antennas (lambda)\n",
"\n",
"#Calculation\n",
"A_e = n*diameter #Effective aperture (lambda^2)\n",
"D = (4*math.pi*A_e) #Directivity (unitless)\n",
"D_dbi = 10*math.log10(D) #Directivity (dBi)\n",
"ohm_a = (4*math.pi)/D #Beam area (steradians)\n",
"\n",
"#Result\n",
"print \"The directivity is\", round(D), \"or\", round(D_dbi), \"dBi\"\n",
"print \"The beam area is\", ohm_a, \"sr\""
],
"language": "python",
"metadata": {},
"outputs": [
{
"output_type": "stream",
"stream": "stdout",
"text": [
"The directivity is 25.0 or 14.0 dBi\n",
"The beam area is 0.5 sr\n"
]
}
],
"prompt_number": 5
}
],
"metadata": {}
}
]
}
|
