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{
"metadata": {
"name": "raju chapter 6"
},
"nbformat": 3,
"nbformat_minor": 0,
"worksheets": [
{
"cells": [
{
"cell_type": "heading",
"level": 1,
"metadata": {},
"source": "Chapter 6: Radar Transmitters"
},
{
"cell_type": "heading",
"level": 2,
"metadata": {},
"source": "Example 1,Page No:231"
},
{
"cell_type": "code",
"collapsed": false,
"input": "import math\n\n#variable declaration\nF = 9*10**9; #Reflex Klystron operating frequency in hz\nVa = 300; #beam voltage in volts\nI = 20; #Beam current in mA\nn = 1; # for 7/4 mode\n\n#Calculations\n#transit time for reflector space = n+3/4\n\nI1 = I*10**-3; #beam current in mA\nPrfmax =(0.3986*I1*Va)/float(n+3/float(4)); #maximum RF power\n\n#result\n\nprint'Maximum R-F power is %3.3f'%(Prfmax),'Watts';\n",
"language": "python",
"metadata": {},
"outputs": [
{
"output_type": "stream",
"stream": "stdout",
"text": "Maximum R-F power is 1.367 Watts\n"
}
],
"prompt_number": 1
},
{
"cell_type": "heading",
"level": 2,
"metadata": {},
"source": "Example 2,Page No:231"
},
{
"cell_type": "code",
"collapsed": false,
"input": "import math\n\n#variable declaration\nVdc = 2.5*10**3; #Beam voltage\nIdc = 25*10**-3; #beam current in A;\nZo = 10; #charecteristic impedance \nF = 9.5*10**9; #TWT operating frequency in hz\nN = 40; #circuit\n\n#Calculations\n\nC = ((Idc*Zo)/float((4*Vdc)))**(1/float(3)); #gain parameter\nAp = (-9.54)+(47.3*N*C); #Output power gain of twt\nw = 2*math.pi*F;\nvdc = 0.593*10**6*math.sqrt(Vdc);\nBe = w/float(vdc);\n\n#result\n\nprint'Gain parameter is %3.3g'%C;\nprint'Output Power gain is %3.3f'%Ap,' dB';\nprint'phase constant of electron beam is %e'%Be,' rad/m';\n",
"language": "python",
"metadata": {},
"outputs": [
{
"output_type": "stream",
"stream": "stdout",
"text": "Gain parameter is 0.0292\nOutput Power gain is 45.782 dB\nphase constant of electron beam is 2.013162e+03 rad/m\n"
}
],
"prompt_number": 2
},
{
"cell_type": "heading",
"level": 2,
"metadata": {},
"source": "Example 3,Page No:232"
},
{
"cell_type": "code",
"collapsed": false,
"input": "import math\n\n#variable declaration\n\ne = 1.609*10**-19; #charge of electron\nme = 9.109*10**-31; #mass of electron in kg\nB = 0.40; #magnetic flux density\nb = 10*10**-2; #Radius of vane edge from the centre\na = 4*10**-2; #radius of cathode\n\n\n#Calculations\n\nWc = (e/me)*B; #cyclotron angular frequency in radians\nVc = (e/(8*me))*(B**2)*(b**2)*(1-(a/float(b))**2)**2; #cut-off voltage\n\n#result\nprint'Cyclotron Angular Frequency is %g'%Wc,'rad';\nprint'Cut-off voltage is %g'%Vc,'V';\nprint'Note:Cut-off voltage obtained in textbook is wrongly calculated.Instead of (a/b)**2 ,(a/b) is calculated';",
"language": "python",
"metadata": {},
"outputs": [
{
"output_type": "stream",
"stream": "stdout",
"text": "Cyclotron Angular Frequency is 7.06554e+10 rad\nCut-off voltage is 2.49272e+07 V\nNote:Cut-off voltage obtained in textbook is wrongly calculated.Instead of (a/b)**2 ,(a/b) is calculated\n"
}
],
"prompt_number": 3
},
{
"cell_type": "heading",
"level": 2,
"metadata": {},
"source": "Example 4,Page No:232"
},
{
"cell_type": "code",
"collapsed": false,
"input": "import math\n\n#variable declaration\nVa = 900 ; #Accelarating voltage in volts\nF = 3.2*10**9; #operating frequency\nd = 10**-3;\n\n#Calculations\n\nVe = (0.593*10**6)*math.sqrt(Va); #electron velocity\nw = 2*math.pi*F;\ntheta = w*(d/float(Ve)); #transit angle in radians\nBe = math.sin(theta/float(2))/(theta/float(2)); #Beam Coupling Co-efficient\n\n\n#result\n\nprint'Electron Velocity is %3.3e'%Ve,'m/s';\nprint'Transit Angle is %g'%theta,'rad';\nprint'Beam Coupling Co-efficient is %3.3f '%Be; ",
"language": "python",
"metadata": {},
"outputs": [
{
"output_type": "stream",
"stream": "stdout",
"text": "Electron Velocity is 1.779e+07 m/s\nTransit Angle is 1.1302 rad\nBeam Coupling Co-efficient is 0.948 \n"
}
],
"prompt_number": 2
},
{
"cell_type": "heading",
"level": 2,
"metadata": {},
"source": "Example 5,Page No:233"
},
{
"cell_type": "code",
"collapsed": false,
"input": "import math\n\n#variable declaration\nI2 = 28*10**-3 ; #induced current in amperes\nV2 = 850; #fundamental component of catcher-gap voltage\nVb = 900; #beam voltage\nIb = 26*10**-3; #beam current\nBc = 0.946; #beam coupling coefficient of catcher gap\n\n#Calculations\n\nn = ((Bc*I2*V2)/(2*Ib*Vb))*100; #efficiency of klystron\n\n\n#result\nprint'Efficiency of the klystron is %g'%n;\nprint'Note:In textbook Bc value is taken as 0.946 in calculation';",
"language": "python",
"metadata": {},
"outputs": [
{
"output_type": "stream",
"stream": "stdout",
"text": "Efficiency of the klystron is 48.1085\nNote:In textbook Bc value is taken as 0.946 in calculation\n"
}
],
"prompt_number": 3
},
{
"cell_type": "heading",
"level": 2,
"metadata": {},
"source": "Example 6,Page No:233"
},
{
"cell_type": "code",
"collapsed": false,
"input": "import math\n\n#variable declaration\nVd = 2.2*10**5; #carrier Drift Velocity in m/s\nl = 5*10**-6; #drift region length\n\n#Calculations\n\nF = Vd/float((2*l)); #frequency of IMPATT Diode\n\n#result\nprint'Frequency of IMPATT Diode is %g'%(F/10**9),' Ghz';",
"language": "python",
"metadata": {},
"outputs": [
{
"output_type": "stream",
"stream": "stdout",
"text": "Frequency of IMPATT Diode is 22 Ghz\n"
}
],
"prompt_number": 23
},
{
"cell_type": "heading",
"level": 2,
"metadata": {},
"source": "Example 7,Page No:233"
},
{
"cell_type": "code",
"collapsed": false,
"input": "import math\n\n#variable declaration\nVd = 3*10**5; #Carrier Drift Velocity in m/s\nl = 7*10**-6; #drift region length\n\n#Calculations\n\nF = Vd/float(2*l); #frequency of IMPATT Diode\n\n#result\nprint'Frequency of IMPATT Diode is %3.2f'%(F/float(10**9)),' Ghz';",
"language": "python",
"metadata": {},
"outputs": [
{
"output_type": "stream",
"stream": "stdout",
"text": "Frequency of IMPATT Diode is 21.43 Ghz\n"
}
],
"prompt_number": 25
},
{
"cell_type": "heading",
"level": 2,
"metadata": {},
"source": "Example 8,Page No:233"
},
{
"cell_type": "code",
"collapsed": false,
"input": "import math\n\n#variable declaration\nNa = 1.8*10**15; #Doping Concentration \nJ = 25*10**3; #current density in A/cm^2\nq = 1.6*10**-19; #charge of electron\n\n#Calculations\n\nVaz = J/float(q*Na); #Avalanche Zone Velocity\n\n#result\nprint'Avalanche Zone Velocity of TRAPATT is %g'%(Vaz);\nprint'Note: wrong calculation done in Textbook';",
"language": "python",
"metadata": {},
"outputs": [
{
"output_type": "stream",
"stream": "stdout",
"text": "Avalanche Zone Velocity of TRAPATT is 8.68056e+07\nNote: wrong calculation done in Textbook\n"
}
],
"prompt_number": 6
},
{
"cell_type": "heading",
"level": 2,
"metadata": {},
"source": "Example 9,Page No:234"
},
{
"cell_type": "code",
"collapsed": false,
"input": "import math\n\n#variable declaration\nl = 12*10**-3; #gunn diode oscillator length in m\nVd = 2*10**8; #Drift velocity in gunn diode\n\n#Calculations\n\nF = Vd/float(l); #Frequency of Gunn Diode Oscillator\n\n#result\nprint'Frequency of Gunn Diode Oscillator is %3.3g'%(F/10**9),' Ghz';\n",
"language": "python",
"metadata": {},
"outputs": [
{
"output_type": "stream",
"stream": "stdout",
"text": "Frequency of Gunn Diode Oscillator is 16.7 Ghz\n"
}
],
"prompt_number": 7
},
{
"cell_type": "heading",
"level": 2,
"metadata": {},
"source": "Example 10,Page No:234"
},
{
"cell_type": "code",
"collapsed": false,
"input": "import math\n\n#variable declaration\n\nl = 2.5*10**-6; #Drift length of gunn diode in m\nVd = 2*10**8; #Drift velocity in gun diode\nVgmin = 3.3*10**3; #minimum voltage gradient required to start the diode\n\n#Calculations\n\nVmin = Vgmin*l;\n\n#result\nprint'Minimum Voltage required to operate gunn diode is %g'%(Vmin*10**3),' mV';",
"language": "python",
"metadata": {},
"outputs": [
{
"output_type": "stream",
"stream": "stdout",
"text": "Minimum Voltage required to operate gunn diode is 8.25 mV\n"
}
],
"prompt_number": 8
},
{
"cell_type": "code",
"collapsed": false,
"input": "",
"language": "python",
"metadata": {},
"outputs": []
}
],
"metadata": {}
}
]
}
|
