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{
"cells": [
{
"cell_type": "markdown",
"metadata": {},
"source": [
"# Chapter16 Antennas"
]
},
{
"cell_type": "markdown",
"metadata": {},
"source": [
"## Example 16.7.2,Pg.no.590"
]
},
{
"cell_type": "code",
"execution_count": 1,
"metadata": {
"collapsed": false
},
"outputs": [
{
"name": "stdout",
"output_type": "stream",
"text": [
"The −3dB beamwidth is 90.0 degree\n"
]
}
],
"source": [
"import math\n",
"from math import sqrt\n",
"g_x=0.5\n",
"x=math.asin(sqrt(g_x))\n",
"g_y=0.5\n",
"y1=math.asin(sqrt(g_y))\n",
"y=y1+90\n",
"#Therefore\n",
"z=y-x\n",
"print 'The −3dB beamwidth is',z,'degree'"
]
},
{
"cell_type": "markdown",
"metadata": {},
"source": [
"## Example 16.9.1,Pg.no.597"
]
},
{
"cell_type": "code",
"execution_count": 2,
"metadata": {
"collapsed": false
},
"outputs": [
{
"name": "stdout",
"output_type": "stream",
"text": [
"l_effective= 0.32\n"
]
}
],
"source": [
"import math\n",
"from math import pi\n",
"Io=1\n",
"wl=1\n",
"phy_length=wl/2\n",
"I_av=2*Io/pi\n",
"#Thus area is given as\n",
"Area=I_av*phy_length\n",
"l_eff=wl/pi\n",
"l_eff=round(l_eff,2)\n",
"#From the above eq l_effective is given as\n",
"print 'l_effective=',l_eff"
]
},
{
"cell_type": "markdown",
"metadata": {},
"source": [
"## Example 16.19.1,Pg.no.621"
]
},
{
"cell_type": "code",
"execution_count": 3,
"metadata": {
"collapsed": false
},
"outputs": [
{
"name": "stdout",
"output_type": "stream",
"text": [
"Effective area is 18.38 m**2\n",
"The directivity is 256633.2\n",
"The −3dB beamwidth is 0.35 degree\n",
"The null beamwidth is 0.7 degree\n"
]
}
],
"source": [
"import math\n",
"from math import pi\n",
"D=6.0 #reflector diameter in m\n",
"n=0.65 #illumination effeciency\n",
"f=10**10 #frequency of operation in Hz\n",
"c=3*10**8 #velo of light in m/s\n",
"wl=0.03 #c/f\n",
"A=(pi*D**2)/4\n",
"A_eff=n*A\n",
"A_eff=round(A_eff,2)\n",
"print 'Effective area is',A_eff,'m**2'\n",
"D0=(4*pi*A_eff)/wl**2\n",
"D0=round(D0,1)\n",
"print 'The directivity is',D0\n",
"BW_dB=70*wl/D\n",
"print 'The −3dB beamwidth is',BW_dB,'degree'\n",
"BW_null=2*BW_dB\n",
"print 'The null beamwidth is',BW_null,'degree' "
]
}
],
"metadata": {
"kernelspec": {
"display_name": "Python 2",
"language": "python",
"name": "python2"
},
"language_info": {
"codemirror_mode": {
"name": "ipython",
"version": 2
},
"file_extension": ".py",
"mimetype": "text/x-python",
"name": "python",
"nbconvert_exporter": "python",
"pygments_lexer": "ipython2",
"version": "2.7.10"
}
},
"nbformat": 4,
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|
