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{
"metadata": {
"name": ""
},
"nbformat": 3,
"nbformat_minor": 0,
"worksheets": [
{
"cells": [
{
"cell_type": "markdown",
"metadata": {},
"source": [
"<h1>Chapter 11: Broadband and Frequency-Independent Antennas<h1>"
]
},
{
"cell_type": "markdown",
"metadata": {},
"source": [
"<h3>Example 11-1.1, Page number: 423<h3>"
]
},
{
"cell_type": "code",
"collapsed": false,
"input": [
"#Variable declaration\n",
"d = 4 #spacing (mm)\n",
"D = 100 #distance between the openings (mm)\n",
"\n",
"#Calculation\n",
"lambda_short = 10*d #Shortest wavelength (mm)\n",
"lambda_long = 2*D #Longest wavelength (mm)\n",
"bandwidth = lambda_long/lambda_short #Bandwidth (unitless)\n",
"\n",
"#Result\n",
"print \"The approximate bandwidth is\", bandwidth,\"to 1\""
],
"language": "python",
"metadata": {},
"outputs": [
{
"output_type": "stream",
"stream": "stdout",
"text": [
"The approximate bandwidth is 5 to 1\n"
]
}
],
"prompt_number": 1
},
{
"cell_type": "markdown",
"metadata": {},
"source": [
"<h3>Example 11-7.1, Page number: 438<h3>"
]
},
{
"cell_type": "code",
"collapsed": false,
"input": [
"from math import atan,pi,log\n",
"\n",
"#Variable declaration\n",
"gain_dbi = 7.0 #Gain (dBi)\n",
"bandwidth = 4 #Relative bandwidth (unitless)\n",
"s_lambda = 0.15 #Spacing (lambda)\n",
"k = 1.2 #Scale constant (unitless)\n",
"\n",
"#Calculation\n",
"alpha = atan((1-1/k)/(4*s_lambda))*180/pi #Apex angle (degrees)\n",
"n = round(log(bandwidth)/log(k)) #Number of elements(unitless)\n",
"n += 1\n",
"n += 2 #Number of elements considering conservative design (unitless)\n",
"\n",
"#Result\n",
"print \"The apex angle is\", round(alpha,1), \"degrees\"\n",
"print \"The number of elements is\", n"
],
"language": "python",
"metadata": {},
"outputs": [
{
"output_type": "stream",
"stream": "stdout",
"text": [
"The apex angle is 15.5 degrees\n",
"The number of elements is 11.0\n"
]
}
],
"prompt_number": 2
}
],
"metadata": {}
}
]
}
|
