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diff --git a/Antenna_and_Wave_Propagation_by_k.k._sharma/chapter7.ipynb b/Antenna_and_Wave_Propagation_by_k.k._sharma/chapter7.ipynb new file mode 100755 index 00000000..a5b1cf64 --- /dev/null +++ b/Antenna_and_Wave_Propagation_by_k.k._sharma/chapter7.ipynb @@ -0,0 +1,274 @@ +{ + "metadata": { + "name": "", + "signature": "" + }, + "nbformat": 3, + "nbformat_minor": 0, + "worksheets": [ + { + "cells": [ + { + "cell_type": "heading", + "level": 1, + "metadata": {}, + "source": [ + "chapter 07 : Antenna Measurements" + ] + }, + { + "cell_type": "heading", + "level": 2, + "metadata": {}, + "source": [ + "Exa 7.1 : page 7.28" + ] + }, + { + "cell_type": "code", + "collapsed": false, + "input": [ + "#given data :\n", + "f=6.0 #in GHz\n", + "f=f*10**9 #in Hz\n", + "d=10 #in feet\n", + "d=3.048 #in meter\n", + "c=3*10**8 #in m/s\n", + "lamda=c/f #in meters\n", + "rmin=2*d**2/lamda #in meters\n", + "print \"Minimum separation distance = %0.2f m\" %rmin" + ], + "language": "python", + "metadata": {}, + "outputs": [ + { + "output_type": "stream", + "stream": "stdout", + "text": [ + "Minimum separation distance = 371.61 m\n" + ] + } + ], + "prompt_number": 1 + }, + { + "cell_type": "heading", + "level": 2, + "metadata": {}, + "source": [ + "Exa 7.2 : page 7.28" + ] + }, + { + "cell_type": "code", + "collapsed": false, + "input": [ + "#given data :\n", + "GP=12.5 #unitless\n", + "P_dB=23 #in dB\n", + "P=10**(P_dB/10) #unitless\n", + "G=GP*P #unitless\n", + "GdB=GP+P_dB #in dB\n", + "print \"Gain of large antenna = %0.2f \"% GdB\n", + "#Note : Answer in the book is wrong." + ], + "language": "python", + "metadata": {}, + "outputs": [ + { + "output_type": "stream", + "stream": "stdout", + "text": [ + "Gain of large antenna = 35.50 \n" + ] + } + ], + "prompt_number": 2 + }, + { + "cell_type": "heading", + "level": 2, + "metadata": {}, + "source": [ + "Exa 7.3 : page 7.28" + ] + }, + { + "cell_type": "code", + "collapsed": false, + "input": [ + "from math import log10\n", + "#given data :\n", + "print \"Open mouth aperture, D = 10*lambda\" \n", + "print \"Power gain : GP = 6*(D/labda)**2\" \n", + "GP=6*10**2 #unitless\n", + "GPdB=10*log10(GP)\n", + "print \"Power gain = %0.1f dB \" %GPdB " + ], + "language": "python", + "metadata": {}, + "outputs": [ + { + "output_type": "stream", + "stream": "stdout", + "text": [ + "Open mouth aperture, D = 10*lambda\n", + "Power gain : GP = 6*(D/labda)**2\n", + "Power gain = 27.8 dB \n" + ] + } + ], + "prompt_number": 5 + }, + { + "cell_type": "heading", + "level": 2, + "metadata": {}, + "source": [ + "Exa 7.4 : page 7.28" + ] + }, + { + "cell_type": "code", + "collapsed": false, + "input": [ + "#given data :\n", + "f=30000. #in MHz\n", + "f=f*10**6 #in Hz\n", + "d=20 #in feet\n", + "d=20*0.3048 #in meter\n", + "c=3*10**8 #in m/s\n", + "lamda=c/f #in meters\n", + "r=2*d**2/lamda #in meters\n", + "print \"Minimum distance between primary and secondary = %0.2f m\" %r\n", + "# Answe wrong in the textbook." + ], + "language": "python", + "metadata": {}, + "outputs": [ + { + "output_type": "stream", + "stream": "stdout", + "text": [ + "Minimum distance between primary and secondary = 7432.24 m\n" + ] + } + ], + "prompt_number": 21 + }, + { + "cell_type": "heading", + "level": 2, + "metadata": {}, + "source": [ + "Exa 7.5 : page 7.29" + ] + }, + { + "cell_type": "code", + "collapsed": false, + "input": [ + "#given data :\n", + "f=1.2 #in GHz\n", + "f=f*10**9 #in Hz\n", + "BWFN=5 #in degree\n", + "c=3.0*10**8 #in m/s\n", + "lamda=c/f #in meters\n", + "D=140*lamda/BWFN #in meters\n", + "print \"Diameter of a paraboloidal reflector = %0.2f m\" %D" + ], + "language": "python", + "metadata": {}, + "outputs": [ + { + "output_type": "stream", + "stream": "stdout", + "text": [ + "Diameter of a paraboloidal reflector = 7.00 m\n" + ] + } + ], + "prompt_number": 23 + }, + { + "cell_type": "heading", + "level": 2, + "metadata": {}, + "source": [ + "Exa 7.6 : page 7.29" + ] + }, + { + "cell_type": "code", + "collapsed": false, + "input": [ + "from math import pi, sqrt, log10\n", + "#given data :\n", + "f=9.0 #in GHz\n", + "f=f*10**9 #in Hz\n", + "c=3*10**8 #in m/s\n", + "lamda=c/f #in meters\n", + "r=35 #in cm\n", + "r=r*10**-2 #in meters\n", + "Attenuation=9.8 #in dB\n", + "#Formula : 10*log10(WT/Wr) = 9.8dB\n", + "WTbyWr=10**(Attenuation/10) #unitless\n", + "D=(4*pi*r/lamda)*(sqrt(1/WTbyWr)) #unitless\n", + "D_dB=10*log10(D) \n", + "print \"Gain of the horn = %0.2f dB \" %D_dB " + ], + "language": "python", + "metadata": {}, + "outputs": [ + { + "output_type": "stream", + "stream": "stdout", + "text": [ + "Gain of the horn = 16.30 dB \n" + ] + } + ], + "prompt_number": 25 + }, + { + "cell_type": "heading", + "level": 2, + "metadata": {}, + "source": [ + "Exa 7.7 : page 7.29" + ] + }, + { + "cell_type": "code", + "collapsed": false, + "input": [ + "from math import pi, sqrt, log10\n", + "#given data :\n", + "ratio = 28 # length:diameter\n", + "from sympy import symbols, N\n", + "lamda = symbols('lamda')\n", + "L = 0.925*lamda\n", + "Z = 710+1J*0 # ohm\n", + "Zs = 35476/Z # ohm\n", + "D = L/ratio\n", + "omega = 2*D\n", + "print \"omega =\",N(omega,2)" + ], + "language": "python", + "metadata": {}, + "outputs": [ + { + "output_type": "stream", + "stream": "stdout", + "text": [ + "omega = 0.066*lamda\n" + ] + } + ], + "prompt_number": 28 + } + ], + "metadata": {} + } + ] +} |