added books

1 files changed, 272 insertions, 0 deletions

diff --git a/Antennas_and_Wave_Propagation/chapter4.ipynb b/Antennas_and_Wave_Propagation/chapter4.ipynb
new file mode 100644
index 00000000..e1fba10d
--- /dev/null
+++ b/Antennas_and_Wave_Propagation/chapter4.ipynb
@@ -0,0 +1,272 @@
+{
+ "metadata": {
+  "name": ""
+ },
+ "nbformat": 3,
+ "nbformat_minor": 0,
+ "worksheets": [
+  {
+   "cells": [
+    {
+     "cell_type": "markdown",
+     "metadata": {},
+     "source": [
+      "<h1>Chapter 4: Radiation<h1>"
+     ]
+    },
+    {
+     "cell_type": "markdown",
+     "metadata": {},
+     "source": [
+      "<h3>Example 4-4.1, Page number: 75<h3>"
+     ]
+    },
+    {
+     "cell_type": "code",
+     "collapsed": false,
+     "input": [
+      "import math\n",
+      "\n",
+      "#Variable declaration\n",
+      "theta = 30              #Angle of radiation (degrees)\n",
+      "epsilon_0 = 8.854e-12   #Permittivity of free space (F/m)\n",
+      "I_dl = 10               #Current in length dl (A-m)\n",
+      "r = 100e3               #Distance of point from origin (m)\n",
+      "\n",
+      "#Calculation\n",
+      "E_mag = (I_dl*math.sin(theta*math.pi/180))/(4*math.pi*epsilon_0)\n",
+      "                        #Magnitude of Electric field vector (V/m)\n",
+      "H_mag = (I_dl*math.sin(theta*math.pi/180))/(4)\n",
+      "                        #Magnitude of Magnetic field vector (T)\n",
+      "\n",
+      "#Result\n",
+      "print \"The magnitude of E vector is \", round(E_mag,-9), \"V/m\"\n",
+      "print \"The magnitude of H vector is\", round(H_mag, 3), \"/pi T\""
+     ],
+     "language": "python",
+     "metadata": {},
+     "outputs": [
+      {
+       "output_type": "stream",
+       "stream": "stdout",
+       "text": [
+        "The magnitude of E vector is  45000000000.0 V/m\n",
+        "The magnitude of H vector is 1.25 /pi T\n"
+       ]
+      }
+     ],
+     "prompt_number": 6
+    },
+    {
+     "cell_type": "markdown",
+     "metadata": {},
+     "source": [
+      "<h3>Example 4-4.2, Page number: 76<h3>"
+     ]
+    },
+    {
+     "cell_type": "code",
+     "collapsed": false,
+     "input": [
+      "import math\n",
+      "\n",
+      "#Variable declaration\n",
+      "v = 3e8         #Speed of light(m/s)\n",
+      "f = 10e6        #Frequency (Hz)\n",
+      "\n",
+      "#Calculation\n",
+      "w = 2*math.pi*f     #Angular frequency(rad/s)\n",
+      "r = v/w             #Distance (m)\n",
+      "\n",
+      "#Result\n",
+      "print \"The distance for the specified condition is\", round(r, 2), \"m\""
+     ],
+     "language": "python",
+     "metadata": {},
+     "outputs": [
+      {
+       "output_type": "stream",
+       "stream": "stdout",
+       "text": [
+        "The distance for the specified condition is 4.77 m\n"
+       ]
+      }
+     ],
+     "prompt_number": 3
+    },
+    {
+     "cell_type": "markdown",
+     "metadata": {},
+     "source": [
+      "<h3>Example 4-4.3, Page number: 76<h3>"
+     ]
+    },
+    {
+     "cell_type": "code",
+     "collapsed": false,
+     "input": [
+      "import math\n",
+      "\n",
+      "#Variable declaration\n",
+      "c = 3e8             #Speed of light (m/s)\n",
+      "f = 3e9             #Frequency (Hz)\n",
+      "\n",
+      "#Calculation\n",
+      "v = 0.6*c           #60% of velocity of light (m/s)\n",
+      "w = 2*math.pi*f     #Angular frequency (rad/s)\n",
+      "r = v/w             #Distance (m)\n",
+      "\n",
+      "#Result\n",
+      "print \"The distance for the specified condition is\", round(r,6), \"m\""
+     ],
+     "language": "python",
+     "metadata": {},
+     "outputs": [
+      {
+       "output_type": "stream",
+       "stream": "stdout",
+       "text": [
+        "The distance for the specified condition is 0.009549 m\n"
+       ]
+      }
+     ],
+     "prompt_number": 4
+    },
+    {
+     "cell_type": "markdown",
+     "metadata": {},
+     "source": [
+      "<h3>Example 4-5.1, Page number: 80<h3>"
+     ]
+    },
+    {
+     "cell_type": "code",
+     "collapsed": false,
+     "input": [
+      "import math\n",
+      "\n",
+      "#Variable declaration\n",
+      "dl = 1e-2       #Length of radiating element (m)\n",
+      "I_eff = 0.5     #Effective current (A)\n",
+      "f = 3e9         #Frequency (Hz)\n",
+      "c = 3e8         #Velocity of light (m/s)\n",
+      "\n",
+      "#Calculation\n",
+      "w = 2*math.pi*f     #Angular Frequency (rad/s)\n",
+      "P = 20*(w**2)*(I_eff**2)*(dl**2)/(c**2)     #Radiated power (W)\n",
+      "\n",
+      "#Result\n",
+      "print \"The radiated power is\", round(P, 2), \"W\"\n",
+      "\n",
+      "#The final result is incorrect in the book because of the calculation mistake"
+     ],
+     "language": "python",
+     "metadata": {},
+     "outputs": [
+      {
+       "output_type": "stream",
+       "stream": "stdout",
+       "text": [
+        "The radiated power is 1.97 W\n"
+       ]
+      }
+     ],
+     "prompt_number": 5
+    },
+    {
+     "cell_type": "markdown",
+     "metadata": {},
+     "source": [
+      "<h3>Example 4-5.2, Page number: 80<h3>"
+     ]
+    },
+    {
+     "cell_type": "code",
+     "collapsed": false,
+     "input": [
+      "#Variable declaration\n",
+      "L = 5         #Length of radiating element (m)\n",
+      "f1 = 30e3     #Frequency (Hz)  \n",
+      "f2 = 30e6     #Frequency (Hz)  \n",
+      "f3 = 15e6     #Frequency (Hz)\n",
+      "c = 3e8       #Velocity of light (m/s)  \n",
+      "\n",
+      "#Calculation\n",
+      "wave_lt1 = c/f1                 #Wavelength (m)\n",
+      "wave_lt1 /= 10\n",
+      "R_r1 = 800*(L/wave_lt1)**2      #Radiation resistance (ohm)\n",
+      "\n",
+      "wave_lt2 = c/f2                 #Wavelength (m)\n",
+      "L = wave_lt2/2                  #Effective length (m)\n",
+      "R_r2 = 200*(L/wave_lt2)**2      #Radiation resistance (ohm)\n",
+      "\n",
+      "wave_lt3 = c/f3                 #Wavelength (m)\n",
+      "L = wave_lt3/4                  #Effective length (m)\n",
+      "R_r3 = 400*(L/wave_lt3)**2      #Radiation resistance (ohm)\n",
+      "\n",
+      "#Result\n",
+      "print \"The radiation resistance for f1 is\", R_r1, \"ohms\"\n",
+      "print \"The radiation resistance for f2 is\", round(R_r2), \"ohms\"\n",
+      "print \"The radiation resistance for f3 is\", round(R_r3), \"ohms\""
+     ],
+     "language": "python",
+     "metadata": {},
+     "outputs": [
+      {
+       "output_type": "stream",
+       "stream": "stdout",
+       "text": [
+        "The radiation resistance for f1 is 0.02 ohms\n",
+        "The radiation resistance for f2 is 50.0 ohms\n",
+        "The radiation resistance for f3 is 25.0 ohms\n"
+       ]
+      }
+     ],
+     "prompt_number": 6
+    },
+    {
+     "cell_type": "markdown",
+     "metadata": {},
+     "source": [
+      "<h3>Example 4-6.1, Page number: 82<h3>"
+     ]
+    },
+    {
+     "cell_type": "code",
+     "collapsed": false,
+     "input": [
+      "import math\n",
+      "\n",
+      "#Variable declaration\n",
+      "Im = 5              #Maximum current (A)\n",
+      "r = 1e3             #Distance (km)\n",
+      "eta = 120*math.pi   #Intrinsic impedence (ohm)\n",
+      "theta = 60*math.pi/180          #Angle of radiation (radians)\n",
+      "\n",
+      "#Calculation\n",
+      "sin2 = math.sin(theta)**2       #Sine squared theta (unitless)\n",
+      "P_av = (eta*(Im**2))/(8*(math.pi**2)*(r**2))\n",
+      "P_av = P_av*(math.cos(math.pi/2*math.cos(theta))**2)/(sin2)\n",
+      "                        #Average power (W)\n",
+      "                        \n",
+      "#Result\n",
+      "print \"The average power available at 1km distance is\", round(P_av,9), \"W\""
+     ],
+     "language": "python",
+     "metadata": {},
+     "outputs": [
+      {
+       "output_type": "stream",
+       "stream": "stdout",
+       "text": [
+        "The average power available at 1km distance is 7.9577e-05 W\n"
+       ]
+      }
+     ],
+     "prompt_number": 8
+    }
+   ],
+   "metadata": {}
+  }
+ ]
+}
\ No newline at end of file