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diff --git a/Antennas_and_Wave_Propagation/chapter16.ipynb b/Antennas_and_Wave_Propagation/chapter16.ipynb
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+{
+ "metadata": {
+  "name": ""
+ },
+ "nbformat": 3,
+ "nbformat_minor": 0,
+ "worksheets": [
+  {
+   "cells": [
+    {
+     "cell_type": "markdown",
+     "metadata": {},
+     "source": [
+      "<h1>Chapter 16: Practical Design Considerations of Large Aperture Antennas<h1>"
+     ]
+    },
+    {
+     "cell_type": "markdown",
+     "metadata": {},
+     "source": [
+      "<h3>Example 16-2.1, Page number: 608<h3>"
+     ]
+    },
+    {
+     "cell_type": "code",
+     "collapsed": false,
+     "input": [
+      "from math import cos, pi, log10\n",
+      "\n",
+      "#Variable declaration\n",
+      "delta = 1/20.0        #rms deviation (lambda)\n",
+      "\n",
+      "#Calculations\n",
+      "del_phi = 4*pi*delta*180/pi #Phase error (degrees)\n",
+      "kg = cos(del_phi*pi/180)**2        #Gain-loss (unitless)\n",
+      "kg = 10*log10(kg)           #Gain-loss (dB)\n",
+      "\n",
+      "#Result\n",
+      "print \"The gain reduction is\", round(abs(kg),1), \"dB\""
+     ],
+     "language": "python",
+     "metadata": {},
+     "outputs": [
+      {
+       "output_type": "stream",
+       "stream": "stdout",
+       "text": [
+        " The gain reduction is 1.8 dB\n"
+       ]
+      }
+     ],
+     "prompt_number": 2
+    },
+    {
+     "cell_type": "markdown",
+     "metadata": {},
+     "source": [
+      "<h3>Example 16-2.2, Page number: 609<h3>"
+     ]
+    },
+    {
+     "cell_type": "code",
+     "collapsed": false,
+     "input": [
+      "from math import tan,pi, log10\n",
+      "\n",
+      "#Variable declaration\n",
+      "del_phi = 36.0    #rms phase error (degrees)\n",
+      "n_irr = 100.0     #Number of irregularities\n",
+      "\n",
+      "#Calculations\n",
+      "max_side = tan(del_phi*pi/180)**2\n",
+      "max_side = -10*log10(max_side)\n",
+      "            #Maximum side-lobe level (dB)\n",
+      "ran_side = (1/n_irr)*tan(del_phi*pi/180)**2\n",
+      "ran_side = -10*log10(ran_side)\n",
+      "            #Random side-lobe level (dB)\n",
+      "\n",
+      "#Result\n",
+      "print \"The maximum side lobe level from main lobe is\", round(max_side,1),\"dB\"\n",
+      "print \"The random side lobe level from main lobe is\", round(ran_side,1),\"dB\""
+     ],
+     "language": "python",
+     "metadata": {},
+     "outputs": [
+      {
+       "output_type": "stream",
+       "stream": "stdout",
+       "text": [
+        "The maximum side lobe level from main lobe is 2.8 dB\n",
+        "The random side lobe level from main lobe is 22.8 dB\n"
+       ]
+      }
+     ],
+     "prompt_number": 4
+    }
+   ],
+   "metadata": {}
+  }
+ ]
+}
+\ No newline at end of file