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diff --git a/Microwave_Engineering_by_G._S._Raghuvanshi/Ch3.ipynb b/Microwave_Engineering_by_G._S._Raghuvanshi/Ch3.ipynb new file mode 100644 index 00000000..58613139 --- /dev/null +++ b/Microwave_Engineering_by_G._S._Raghuvanshi/Ch3.ipynb @@ -0,0 +1,258 @@ +{ + "metadata": { + "name": "", + "signature": "sha256:cae0ff7581c3b5c12e11b4f1b44c3beb02347fef7d7d6837104f81f1c4303c1b" + }, + "nbformat": 3, + "nbformat_minor": 0, + "worksheets": [ + { + "cells": [ + { + "cell_type": "heading", + "level": 1, + "metadata": {}, + "source": [ + "Ch-3 : Microwave Network Analysis" + ] + }, + { + "cell_type": "heading", + "level": 2, + "metadata": {}, + "source": [ + "Page Number: 142 Example 3.4" + ] + }, + { + "cell_type": "code", + "collapsed": false, + "input": [ + "from __future__ import division\n", + "from numpy import array, linalg, mat, set_printoptions\n", + "\n", + "#Given\n", + "\n", + "z=mat('[4 2 ;2 4]')\n", + "I=mat('[1 0;0 1]') \n", + "\n", + "\n", + "#Scattering matrix\n", + "s=(z-I)*linalg.inv(z+I)\n", + "set_printoptions(precision=3)\n", + "print 'Scattering Matrix:\\n' ,s" + ], + "language": "python", + "metadata": {}, + "outputs": [ + { + "output_type": "stream", + "stream": "stdout", + "text": [ + "Scattering Matrix:\n", + "[[ 0.524 0.19 ]\n", + " [ 0.19 0.524]]\n" + ] + } + ], + "prompt_number": 12 + }, + { + "cell_type": "heading", + "level": 2, + "metadata": {}, + "source": [ + "Page Number: 142 Example 3.5" + ] + }, + { + "cell_type": "code", + "collapsed": false, + "input": [ + "from math import sqrt, pi \n", + "from cmath import exp\n", + "#Given\n", + "P=12.8e-3 #W\n", + "l=3 #cm\n", + "lamb=4.2 #cm\n", + "vswr=2.2 \n", + "jfi=1J*4.49 \n", + "\n", + "#ap\n", + "ap=sqrt(2*P) \n", + "\n", + "#Phase shift\n", + "bl=(2*pi*l)/lamb \n", + "#bp\n", + "bp=(ap*(vswr-1))/(vswr+1) \n", + "\n", + "a=ap*exp(jfi) \n", + "b=bp*exp(jfi) \n", + "print 'Required Waves:\\n{:.3}'.format(a),'\\n{:.3}'.format(b)" + ], + "language": "python", + "metadata": {}, + "outputs": [ + { + "output_type": "stream", + "stream": "stdout", + "text": [ + "Required Waves:\n", + "(-0.0353-0.156j) \n", + "(-0.0132-0.0585j)\n" + ] + } + ], + "prompt_number": 13 + }, + { + "cell_type": "heading", + "level": 2, + "metadata": {}, + "source": [ + "Page Number: 143 Example 3.6" + ] + }, + { + "cell_type": "code", + "collapsed": false, + "input": [ + " from math import log10\n", + "#Given\n", + "S11=0.10 \n", + "S12=0.90 \n", + "A12=-45 \n", + "S21=0.90 \n", + "A21=45 \n", + "S22=0.3 \n", + "\n", + "#(i) Network is reciprocal\n", + "if(A12==A21):\n", + " print 'Network is reciprocal' \n", + "else:\n", + " \n", + " print 'Network is not reciprocal' \n", + "\n", + "\n", + "#(ii) Network is lossles\n", + "x=(S11**2)+(S12**2) \n", + "if(x==1):\n", + " print 'Network is lossless' \n", + "else:\n", + " \n", + " print 'Network is not lossless' \n", + "\n", + "\n", + "#(iii)Return loss\n", + "T=S11-((S12*S21)/(1+S22)) \n", + "Tm=-T #mod of T\n", + "L=-20*log10(Tm) \n", + "print 'Return Loss: %0.3f'%L,'dB'" + ], + "language": "python", + "metadata": {}, + "outputs": [ + { + "output_type": "stream", + "stream": "stdout", + "text": [ + "Network is not reciprocal\n", + "Network is not lossless\n", + "Return Loss: 5.629 dB\n" + ] + } + ], + "prompt_number": 17 + }, + { + "cell_type": "heading", + "level": 2, + "metadata": {}, + "source": [ + "Page Number: 163 Example 3.12" + ] + }, + { + "cell_type": "code", + "collapsed": false, + "input": [ + "#Given\n", + "S11=0.6 \n", + "S12=0.045 \n", + "S21=2.5 \n", + "S22=0.50 \n", + "TS=0.5 \n", + "TL=0.4 \n", + "Z0=50 #ohm\n", + "Vrms=10 #V\n", + "\n", + "#(i) Gain Parameters\n", + "#(i)Reflection coefficients of input and output\n", + "Tin=S11+((S12*S21*TL)/(1-(S22*TL))) \n", + "Tout=S22+((S12*S21*TS)/(1-(S22*TS))) \n", + "\n", + "#Transducer Gain\n", + "x=(1-(TS)**2)/((1-(S11*TS))**2) \n", + "y=(S21*S21) \n", + "z=(1-(TL)**2)/((1-(Tout*TL))**2) \n", + "GT=x*y*z \n", + "print 'Transducer Gain: %0.3f'%GT\n", + "\n", + "#Available Power Gain\n", + "z1=1-(Tout)**2 \n", + "GA=(x*y)/z1 \n", + "print 'Available power Gain: %0.3f'%GA\n", + "\n", + "#Power Gain\n", + "z2=1-(Tin)**2 \n", + "GP=(x*y)/z2 \n", + "print 'Power Gain: %0.3f'%GP\n", + "\n", + "#(ii) Power levels\n", + "#Power available at source\n", + "Pavs=(sqrt(2)*Vrms)**2/(8*Z0) \n", + "print 'Power available at source: %0.3f'%Pavs,'W'\n", + "\n", + "Pl=9.4*Pavs \n", + "#Power available at input\n", + "Pin=Pl/13.5 \n", + "print 'Power available at input: %0.3f'%Pin,'W'\n", + "\n", + "#(iii) VSWRs\n", + "M1=Pin/Pavs \n", + "M2=Pl/(9.6*Pavs) \n", + "\n", + "Tin1=sqrt(1-M1) \n", + "Tout1=sqrt(1-M2) \n", + "\n", + "vswrin=(1+Tin1)/(1-Tin1) \n", + "print 'Input VSWR: %0.3f'%vswrin\n", + "vswrout=(1+Tout1)/(1-Tout1) \n", + "print 'Output VSWR: %0.3f'%vswrout\n", + "\n", + "#Calculations for gain are done wrong in book, hence answers dont match" + ], + "language": "python", + "metadata": {}, + "outputs": [ + { + "output_type": "stream", + "stream": "stdout", + "text": [ + "Transducer Gain: 13.553\n", + "Available power Gain: 14.291\n", + "Power Gain: 16.803\n", + "Power available at source: 0.500 W\n", + "Power available at input: 0.348 W\n", + "Input VSWR: 3.455\n", + "Output VSWR: 1.337\n" + ] + } + ], + "prompt_number": 20 + } + ], + "metadata": {} + } + ] +}
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