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{
"metadata": {
"name": "",
"signature": "sha256:4d6e811d421f337f1031f361be319cf058aca6316009f472b471c43a8dde51c6"
},
"nbformat": 3,
"nbformat_minor": 0,
"worksheets": [
{
"cells": [
{
"cell_type": "heading",
"level": 1,
"metadata": {},
"source": [
"Chapter12, Reflector Antennas"
]
},
{
"cell_type": "heading",
"level": 2,
"metadata": {},
"source": [
"Example No. 12.9.1, page : 12-21"
]
},
{
"cell_type": "code",
"collapsed": false,
"input": [
"from __future__ import division\n",
"from math import log10\n",
"D=2 #m(Diameter)\n",
"f=6000 #MHz(Frequency)\n",
"c=3*10**8 #m/s##speed of light\n",
"lamda=c/(f*10**6) #m(Wavelength)\n",
"FNBW=140*lamda/D #degree\n",
"print \"First null beam width, FNBW = %0.1f degree \"%FNBW \n",
"GP=6*(D/lamda)**2 #unitless(Power gain)\n",
"GP_dB=10*log10(GP) #dB(Power gain)\n",
"print \"Power Gain = %0.2f dB\"%GP_dB\n",
"#Ans in the book is not accurate."
],
"language": "python",
"metadata": {},
"outputs": [
{
"output_type": "stream",
"stream": "stdout",
"text": [
"First null beam width, FNBW = 3.5 degree \n",
"Power Gain = 39.82 dB\n"
]
}
],
"prompt_number": 3
},
{
"cell_type": "heading",
"level": 2,
"metadata": {},
"source": [
"Example No. 12.9.2, page : 12-22"
]
},
{
"cell_type": "code",
"collapsed": false,
"input": [
"from math import log10, sqrt\n",
"\n",
"GP=1000 #unitless(Power gain)\n",
"lamda=10 #cm(Wavelength)\n",
"D=sqrt(GP/6)*(lamda/100) #m(Diameter)\n",
"print \"Diameter of mouth = %0.2f meter\" %D\n",
"HPBW=58*(lamda/100)/D #degree(HPBW)\n",
"print \"Half power beam width, HPBW = %0.2f degree\"%HPBW"
],
"language": "python",
"metadata": {},
"outputs": [
{
"output_type": "stream",
"stream": "stdout",
"text": [
"Diameter of mouth = 1.29 meter\n",
"Half power beam width, HPBW = 4.49 degree\n"
]
}
],
"prompt_number": 6
},
{
"cell_type": "heading",
"level": 2,
"metadata": {},
"source": [
"Example No. 12.9.3, page : 12-22"
]
},
{
"cell_type": "code",
"collapsed": false,
"input": [
"from math import log10, sqrt, pi\n",
"D=6 #meter(Diameter)\n",
"f=10 #GHz(Frequency)\n",
"c=3*10**8 #m/s##speed of light\n",
"lamda=c/(f*10**9) #m(Wavelength)\n",
"GP=6*(D/lamda)**2 #unitless(Power gain)\n",
"GP_dB=10*log10(GP) #dB(Power gain)\n",
"print \"Gain = %0.2f dB \"%GP_dB\n",
"FNBW=140*lamda/D #degree(FNBW)\n",
"print \"FNBW = %0.2f degree \"%FNBW \n",
"HPBW=58*lamda/D #degree(HPBW)\n",
"print \"HPBW = %0.2f degree \"%HPBW \n",
"K=0.65 #constant\n",
"Ao=K*pi/4*D**2 #m\u00b2(Capture area)\n",
"print \"Capture area = %0.2f m\u00b2 \"%Ao "
],
"language": "python",
"metadata": {},
"outputs": [
{
"output_type": "stream",
"stream": "stdout",
"text": [
"Gain = 53.80 dB \n",
"FNBW = 0.70 degree \n",
"HPBW = 0.29 degree \n",
"Capture area = 18.38 m\u00b2 \n"
]
}
],
"prompt_number": 9
}
],
"metadata": {}
}
]
}
|
