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diff --git a/Antennas_and_Wave_Propagation/chapter3.ipynb b/Antennas_and_Wave_Propagation/chapter3.ipynb new file mode 100644 index 00000000..6656b2c8 --- /dev/null +++ b/Antennas_and_Wave_Propagation/chapter3.ipynb @@ -0,0 +1,175 @@ +{ + "metadata": { + "name": "" + }, + "nbformat": 3, + "nbformat_minor": 0, + "worksheets": [ + { + "cells": [ + { + "cell_type": "markdown", + "metadata": {}, + "source": [ + "<h1>Chapter 3: The Antenna Family<h1>" + ] + }, + { + "cell_type": "markdown", + "metadata": {}, + "source": [ + "<h3>Example 3-3.2, Page number: 58<h3>" + ] + }, + { + "cell_type": "code", + "collapsed": false, + "input": [ + "#Variable declaration\n", + "Z_0 = 377 #Intrinsic impedence of free space(ohm)\n", + "Z_d = 710 +0j #Terminal impedence of dipole cylinder (ohm)\n", + "\n", + "#Calculation\n", + "Z_s = (Z_0**2)/(4*Z_d) #Terminal impedence of the slot (ohm)\n", + "\n", + "#Result\n", + "print \"The terminal impedence of the slot is\", round(Z_s.real), \"ohms\"" + ], + "language": "python", + "metadata": {}, + "outputs": [ + { + "output_type": "stream", + "stream": "stdout", + "text": [ + "The terminal impedence of the slot is 50.0 ohms\n" + ] + } + ], + "prompt_number": 1 + }, + { + "cell_type": "markdown", + "metadata": {}, + "source": [ + "<h3>Example 3-6.1, Page number: 61<h3>" + ] + }, + { + "cell_type": "code", + "collapsed": false, + "input": [ + "import math\n", + "\n", + "#Variable declaration\n", + "L = 10 #Horn length (lambda)\n", + "delta = 0.25 #Path length difference (lambda)\n", + "\n", + "#Calculation\n", + "theta = 2*math.acos(L/(L+delta)) #Horn flare angle (radians)\n", + "theta = theta*180/math.pi #Horn flare angle (degrees)\n", + "\n", + "\n", + "#Result\n", + "print \"The largest flare angle for given delta is\",round(theta,1), \"degrees\"" + ], + "language": "python", + "metadata": {}, + "outputs": [ + { + "output_type": "stream", + "stream": "stdout", + "text": [ + "The largest flare angle for given delta is 25.4 degrees\n" + ] + } + ], + "prompt_number": 2 + }, + { + "cell_type": "markdown", + "metadata": {}, + "source": [ + "<h3>Example 3-7.1, Page number: 62<h3>" + ] + }, + { + "cell_type": "code", + "collapsed": false, + "input": [ + "import math\n", + "\n", + "#Variable declaration\n", + "f = 599e6 #Frequency of TV Station (Hz)\n", + "E = 1e-6 #Field strength (V/m)\n", + "D = 20 #Diameter of antenna (m)\n", + "c = 3e8 #Speed of light (m/s)\n", + "Z_0 = 377 #Intrinsic impedence of free space (ohm) \n", + "\n", + "#Calculation\n", + "wave_lt = c/f #Wavelength (m)\n", + "A_e = (D*(wave_lt**2))/(4*math.pi) #Effective aperture (m^2)\n", + "P_r = (E**2)*A_e/Z_0 #Received power (W)\n", + "\n", + "#Result\n", + "print \"The received power is\", round(P_r,17), \"W\"" + ], + "language": "python", + "metadata": {}, + "outputs": [ + { + "output_type": "stream", + "stream": "stdout", + "text": [ + "The received power is 1.06e-15 W\n" + ] + } + ], + "prompt_number": 4 + }, + { + "cell_type": "markdown", + "metadata": {}, + "source": [ + "<h3>Example 3-11.1, Page number: 66<h3>" + ] + }, + { + "cell_type": "code", + "collapsed": false, + "input": [ + "import math\n", + "\n", + "#Variable declaration\n", + "n = 4 #Number of patch antennas (lambda)\n", + "diameter = 0.5 #diameter of patch antennas (lambda)\n", + "\n", + "#Calculation\n", + "A_e = n*diameter #Effective aperture (lambda^2)\n", + "D = (4*math.pi*A_e) #Directivity (unitless)\n", + "D_dbi = 10*math.log10(D) #Directivity (dBi)\n", + "ohm_a = (4*math.pi)/D #Beam area (steradians)\n", + "\n", + "#Result\n", + "print \"The directivity is\", round(D), \"or\", round(D_dbi), \"dBi\"\n", + "print \"The beam area is\", ohm_a, \"sr\"" + ], + "language": "python", + "metadata": {}, + "outputs": [ + { + "output_type": "stream", + "stream": "stdout", + "text": [ + "The directivity is 25.0 or 14.0 dBi\n", + "The beam area is 0.5 sr\n" + ] + } + ], + "prompt_number": 5 + } + ], + "metadata": {} + } + ] +}
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