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{
"metadata": {
"name": "",
"signature": "sha256:ea57204c71725b24fd5e19dcadce0d03f6181962151b0fccf8c6b17f9528b683"
},
"nbformat": 3,
"nbformat_minor": 0,
"worksheets": [
{
"cells": [
{
"cell_type": "heading",
"level": 1,
"metadata": {},
"source": [
"chapter07:Microwave Measurements"
]
},
{
"cell_type": "heading",
"level": 2,
"metadata": {},
"source": [
"Example 7.1, Page number 278"
]
},
{
"cell_type": "code",
"collapsed": false,
"input": [
"#calculate VSWR\n",
"#chapter-7 page 278 example 7.1\n",
"\n",
"import math\n",
"a=4.##Length of Waveguide in cm\n",
"b=2.5##breadth Waveguide in cm\n",
"f=10.**10.##Frequency in Hz\n",
"x=0.1##distance between twice minimum power points in cm\n",
"c=3.*10.**10.##Velocity of Light in cm/sec\n",
"\n",
"#CALCULATION\n",
"wc=2.*a##Cutoff wavelength in TE10 mode in cms\n",
"w0=(c/f)##Free space wavelength in cms\n",
"wg=(w0/math.sqrt(1-(w0/wc)**2.))##Guide wavelength in cms\n",
"S=(wg/(x*(math.pi)))##Voltage Standing Wave Ratio(VSWR) for double minimum method\n",
"\n",
"#OUTPUT\n",
"print '%s %.1f' %('\\nFor double minimum method, Voltage Standing Wave Ratio(VSWR) is S=',S)#\n"
],
"language": "python",
"metadata": {},
"outputs": [
{
"output_type": "stream",
"stream": "stdout",
"text": [
"\n",
"For double minimum method, Voltage Standing Wave Ratio(VSWR) is S= 10.3\n"
]
}
],
"prompt_number": 1
},
{
"cell_type": "heading",
"level": 2,
"metadata": {},
"source": [
"Example 7.2, Page number 279"
]
},
{
"cell_type": "code",
"collapsed": false,
"input": [
"#calculate reflected power and VSWR\n",
"#chapter-7 page 279 example 7.2\n",
"import math\n",
"x=3##O/P incident power from first directional coupler in mW\n",
"y=0.1##O/P reflected power from second directional coupler in mW\n",
"\n",
"#CALCULATION\n",
"Pi=x*100.##Incident Power in mW\n",
"Pr=y*100.##Reflected Power in mW\n",
"p=math.sqrt(Pr/Pi)##Reflection Coefficient\n",
"S=((1+p)/(1-p))##Voltage Standing Wave Ratio(VSWR)\n",
"\n",
"#OUTPUT\n",
"print '%s %.f %s %s %.2f' %('\\nReflected Power is Pr=',Pr,'mW','\\nVoltage Standing Wave Ratio(VSWR)in the main waveguide is S=',S)#\n"
],
"language": "python",
"metadata": {},
"outputs": [
{
"output_type": "stream",
"stream": "stdout",
"text": [
"\n",
"Reflected Power is Pr= 10 mW \n",
"Voltage Standing Wave Ratio(VSWR)in the main waveguide is S= 1.45\n"
]
}
],
"prompt_number": 2
},
{
"cell_type": "heading",
"level": 2,
"metadata": {},
"source": [
"Example 7.3, Page number 279"
]
},
{
"cell_type": "code",
"collapsed": false,
"input": [
"#calculate VSWR\n",
"import math\n",
"\n",
"#Variable declaration\n",
"Pr = 0.15*10**-3 #reflected power(W)\n",
"Pi = 2.5*10**-3 #incident power(W)\n",
"\n",
"#Calculations\n",
"rho = math.sqrt(Pr/Pi)\n",
"s = (1+rho)/(1-rho)\n",
"\n",
"#Results\n",
"print \"VSWR =\",round(s,2)"
],
"language": "python",
"metadata": {},
"outputs": [
{
"output_type": "stream",
"stream": "stdout",
"text": [
"VSWR = 1.65\n"
]
}
],
"prompt_number": 3
},
{
"cell_type": "heading",
"level": 2,
"metadata": {},
"source": [
"Example 7.4, Page number 279"
]
},
{
"cell_type": "code",
"collapsed": false,
"input": [
"#calculate reflected power\n",
"import math\n",
"\n",
"#Variable declaration\n",
"s = 2. #VSWR\n",
"Pi = 4.5*10**-3*1000 #incident power(W)\n",
"c = 30 #couplers\n",
"\n",
"#Calculations\n",
"#s = (1+rho)/(1-rho)\n",
"rho = (s-1)/(s+1)\n",
"Pr = rho**2*Pi\n",
"\n",
"#Results\n",
"print \"Reflected power =\",Pr,\"W\""
],
"language": "python",
"metadata": {},
"outputs": [
{
"output_type": "stream",
"stream": "stdout",
"text": [
"Reflected power = 0.5 W\n"
]
}
],
"prompt_number": 4
}
],
"metadata": {}
}
]
}
|
