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+{
+"cells": [
+ {
+		   "cell_type": "markdown",
+	   "metadata": {},
+	   "source": [
+       "# Chapter 12: Reflector Antennas"
+	   ]
+	},
+{
+		   "cell_type": "markdown",
+		   "metadata": {},
+		   "source": [
+			"## Example 12.9_1: First_null_beam_width_and_power_gain.sce"
+		   ]
+		  },
+  {
+"cell_type": "code",
+	   "execution_count": null,
+	   "metadata": {
+	    "collapsed": true
+	   },
+	   "outputs": [],
+"source": [
+"//Example No. 12.9.1\n",
+"clc;\n",
+"clear;\n",
+"close;\n",
+"format('v',6);\n",
+"D=2;//m(Diameter)\n",
+"f=6000;//MHz(Frequency)\n",
+"c=3*10^8;//m/s////speed of light\n",
+"lambda=c/(f*10^6);//m(Wavelength)\n",
+"FNBW=140*lambda/D;//degree\n",
+"disp(FNBW,'First null beam width(FNBW in degree) : ');\n",
+"GP=6*(D/lambda)^2;//unitless(Power gain)\n",
+"GP_dB=10*log10(GP);//dB(Power gain)\n",
+"disp(GP_dB,'Power Gain in dB : ');\n",
+"//Ans in the book is not accurate."
+   ]
+   }
+,
+{
+		   "cell_type": "markdown",
+		   "metadata": {},
+		   "source": [
+			"## Example 12.9_2: Diameter_of_mouth_and_HPBW.sce"
+		   ]
+		  },
+  {
+"cell_type": "code",
+	   "execution_count": null,
+	   "metadata": {
+	    "collapsed": true
+	   },
+	   "outputs": [],
+"source": [
+"//Example No. 12.9.2\n",
+"clc;\n",
+"clear;\n",
+"close;\n",
+"format('v',5);\n",
+"GP=1000;//unitless(Power gain)\n",
+"lambda=10;//cm(Wavelength)\n",
+"D=sqrt(GP/6)*(lambda/100);//m(Diameter)\n",
+"disp(D,'Diameter of mouth in meter : ');\n",
+"HPBW=58*(lambda/100)/D;//degree(HPBW)\n",
+"disp(HPBW,'Half power beam width(HPBW in degree) : ');"
+   ]
+   }
+,
+{
+		   "cell_type": "markdown",
+		   "metadata": {},
+		   "source": [
+			"## Example 12.9_3: Gain_Beamwidth_and_capture_area.sce"
+		   ]
+		  },
+  {
+"cell_type": "code",
+	   "execution_count": null,
+	   "metadata": {
+	    "collapsed": true
+	   },
+	   "outputs": [],
+"source": [
+"//Example No. 12.9.3\n",
+"clc;\n",
+"clear;\n",
+"close;\n",
+"format('v',6);\n",
+"D=6;//meter(Diameter)\n",
+"f=10;//GHz(Frequency)\n",
+"c=3*10^8;//m/s////speed of light\n",
+"lambda=c/(f*10^9);//m(Wavelength)\n",
+"GP=6*(D/lambda)^2;//unitless(Power gain)\n",
+"GP_dB=10*log10(GP);//dB(Power gain)\n",
+"disp(GP_dB,'Gain in dB : ');\n",
+"FNBW=140*lambda/D;//degree(FNBW)\n",
+"disp(FNBW,'FNBW in degree : ');\n",
+"HPBW=58*lambda/D;//degree(HPBW)\n",
+"disp(HPBW,'HPBW in degree : ');\n",
+"K=0.65;//constant\n",
+"Ao=K*%pi/4*D^2;//m²(Capture area)\n",
+"disp(Ao,'Capture area in m² : ');"
+   ]
+   }
+],
+"metadata": {
+		  "kernelspec": {
+		   "display_name": "Scilab",
+		   "language": "scilab",
+		   "name": "scilab"
+		  },
+		  "language_info": {
+		   "file_extension": ".sce",
+		   "help_links": [
+			{
+			 "text": "MetaKernel Magics",
+			 "url": "https://github.com/calysto/metakernel/blob/master/metakernel/magics/README.md"
+			}
+		   ],
+		   "mimetype": "text/x-octave",
+		   "name": "scilab",
+		   "version": "0.7.1"
+		  }
+		 },
+		 "nbformat": 4,
+		 "nbformat_minor": 0
+}