{ "metadata": { "name": "", "signature": "sha256:654008bef312166c584c8c37dbba66490dce72fac67bb704aee7db6064bf2e37" }, "nbformat": 3, "nbformat_minor": 0, "worksheets": [ { "cells": [ { "cell_type": "heading", "level": 1, "metadata": {}, "source": [ "Chapter 15 : Introduction to Antennas" ] }, { "cell_type": "heading", "level": 2, "metadata": {}, "source": [ "Example 15.2 Page No : 500" ] }, { "cell_type": "code", "collapsed": false, "input": [ "# Variables\n", "c = 3.*10**8; #speed of light\n", "f = 2.*10**9; #frequency\n", "\n", "# Calculations and Results\n", "lembda = c/f; #wavelength\n", "print 'The wavelength of 2GHz is, = %.2f m'%(lembda);\n", "D = 15.; #m\n", "Rff = 2*D**2/lembda;\n", "print ' The distance to the far field is, Rff = %i m'%(Rff);\n" ], "language": "python", "metadata": {}, "outputs": [ { "output_type": "stream", "stream": "stdout", "text": [ "The wavelength of 2GHz is, = 0.15 m\n", " The distance to the far field is, Rff = 3000 m\n" ] } ], "prompt_number": 2 }, { "cell_type": "heading", "level": 2, "metadata": {}, "source": [ "Example 15.3 Page No : 502" ] }, { "cell_type": "code", "collapsed": false, "input": [ "import math\n", "# Variables\n", "Gmax = 10**5;\n", "\n", "# Calculations\n", "Gmax_dB = 10*math.log10(Gmax);\n", "\n", "# Results\n", "print 'Gmax, dB = %i dB'%(Gmax_dB);\n" ], "language": "python", "metadata": {}, "outputs": [ { "output_type": "stream", "stream": "stdout", "text": [ "Gmax, dB = 50 dB\n" ] } ], "prompt_number": 4 }, { "cell_type": "heading", "level": 2, "metadata": {}, "source": [ "Example 15.4 Page No : 504" ] }, { "cell_type": "code", "collapsed": false, "input": [ "import math \n", "\n", "# Variables\n", "d = 10.**5; #m\n", "Pt = 100.; #W\n", "\n", "# Calculations\n", "Pd = Pt/(4*math.pi*d**2);\n", "\n", "# Results\n", "print 'The power density is ,Pd = %.1f pW/m**2'%(Pd*10**12);\n" ], "language": "python", "metadata": {}, "outputs": [ { "output_type": "stream", "stream": "stdout", "text": [ "The power density is ,Pd = 795.8 pW/m**2\n" ] } ], "prompt_number": 6 }, { "cell_type": "heading", "level": 2, "metadata": {}, "source": [ "Example 15.5 Page No : 504" ] }, { "cell_type": "code", "collapsed": false, "input": [ "import math \n", "\n", "# Variables\n", "d = 10.**5; #m\n", "Pt = 100.; #W\n", "Gt = 50;\n", "\n", "# Calculations\n", "Pd = Gt*Pt/(4*math.pi*d**2);\n", "\n", "# Results\n", "print 'The power density is ,Pd = %.2f nW/m**2'%(Pd*10**9);\n" ], "language": "python", "metadata": {}, "outputs": [ { "output_type": "stream", "stream": "stdout", "text": [ "The power density is ,Pd = 39.79 nW/m**2\n" ] } ], "prompt_number": 7 }, { "cell_type": "heading", "level": 2, "metadata": {}, "source": [ "Example 15.6 Page No : 504" ] }, { "cell_type": "code", "collapsed": false, "input": [ "import math \n", "\n", "# Variables\n", "c = 3.*10**8; #speed of light\n", "f = 15.*10**9; #frequency\n", "\n", "# Calculations and Results\n", "lembda = c/f; #wavelength\n", "print 'The wavelength of 15 GHz is, = %.2f m'%(lembda);\n", "\n", "d = 41.*10**6; #m\n", "Pt = 50.; #W\n", "Gt = 10.**4;\n", "Gr = 10.**5\n", "Pr = lembda**2*Gr*Gt*Pt/((4*math.pi)**2*d**2);\n", "print 'The power density is , Pr = %.1f pW'%(Pr*10**12);\n" ], "language": "python", "metadata": {}, "outputs": [ { "output_type": "stream", "stream": "stdout", "text": [ "The wavelength of 15 GHz is, = 0.02 m\n", "The power density is , Pr = 75.3 pW\n" ] } ], "prompt_number": 8 }, { "cell_type": "heading", "level": 2, "metadata": {}, "source": [ "Example 15.7 Page No : 506" ] }, { "cell_type": "code", "collapsed": false, "input": [ "# Variables\n", "Pt = 2000.; #W\n", "Irms = 5.;\n", "\n", "# Calculations\n", "Rrad = Pt/Irms**2;\n", "\n", "# Results\n", "print 'The radiation resistance is , Rrad = %i ohm'%(Rrad);\n" ], "language": "python", "metadata": {}, "outputs": [ { "output_type": "stream", "stream": "stdout", "text": [ "The radiation resistance is , Rrad = 80 ohm\n" ] } ], "prompt_number": 10 }, { "cell_type": "heading", "level": 2, "metadata": {}, "source": [ "Example 15.11 Page No : 511" ] }, { "cell_type": "code", "collapsed": false, "input": [ "import math \n", "# Variables\n", "#misprinted example number\n", "c = 3.*10**8; #speed of light\n", "f = 10.*10**9; #frequency\n", "\n", "# Calculations and Results\n", "lembda = c/f; #wavelength\n", "print 'The wavelength of 2GHz is, = %.2f m'%(lembda);\n", "D = 12; #m\n", "Ap = math.pi*D**2/4;\n", "print ' a)The physical area is ,Ap = %.2f m**2 '%(Ap);\n", "n1 = .7; #efficiency\n", "Ae = n1*Ap;\n", "print ' The effective capture area is ,Ae = %.2f m**2'%(Ae);\n", "G = 4*math.pi*Ae/lembda**2;\n", "print ' b) The gain is ,G = %i'%(G);\n", "GdB = 10*math.log10(G);\n", "print ' The gaindB) is , GdB = %.1f dB'%(GdB);\n", "theta_3dB = 70*lembda/D;\n", "print ' c) The 3 dB beamwidth = %.3f degrees'%(theta_3dB);\n" ], "language": "python", "metadata": {}, "outputs": [ { "output_type": "stream", "stream": "stdout", "text": [ "The wavelength of 2GHz is, = 0.03 m\n", " a)The physical area is ,Ap = 113.10 m**2 \n", " The effective capture area is ,Ae = 79.17 m**2\n", " b) The gain is ,G = 1105395\n", " The gaindB) is , GdB = 60.4 dB\n", " c) The 3 dB beamwidth = 0.175 degrees\n" ] } ], "prompt_number": 11 }, { "cell_type": "heading", "level": 2, "metadata": {}, "source": [ "Example 15.12 Page No : 507" ] }, { "cell_type": "code", "collapsed": false, "input": [ "\n", "# Variables\n", "c = 3.*10**8; #speed of light\n", "f = 100.*10**6; #frequency\n", "\n", "# Calculations and Results\n", "lembda = c/f; #wavelength\n", "print 'The wavelength of 2GHz is, = %i m'%(lembda);\n", "Ac = 0.13*lembda**2;\n", "print 'The capture area is , Ac = %.2f m**2'%(Ac);\n" ], "language": "python", "metadata": {}, "outputs": [ { "output_type": "stream", "stream": "stdout", "text": [ "The wavelength of 2GHz is, = 3 m\n", "The capture area is , Ac = 1.17 m**2\n" ] } ], "prompt_number": 13 } ], "metadata": {} } ] }