diff options
Diffstat (limited to 'Electronic_Communication_Systems_by_Roy_Blake/Chapter16.ipynb')
| -rw-r--r-- | Electronic_Communication_Systems_by_Roy_Blake/Chapter16.ipynb | 359 |
1 files changed, 359 insertions, 0 deletions
diff --git a/Electronic_Communication_Systems_by_Roy_Blake/Chapter16.ipynb b/Electronic_Communication_Systems_by_Roy_Blake/Chapter16.ipynb new file mode 100644 index 00000000..e2bcce08 --- /dev/null +++ b/Electronic_Communication_Systems_by_Roy_Blake/Chapter16.ipynb @@ -0,0 +1,359 @@ +{ + "cells": [ + { + "cell_type": "markdown", + "metadata": {}, + "source": [ + "# Chapter 16 : Antennas" + ] + }, + { + "cell_type": "markdown", + "metadata": {}, + "source": [ + "## Example 1 : pg 564" + ] + }, + { + "cell_type": "code", + "execution_count": 1, + "metadata": { + "collapsed": false + }, + "outputs": [ + { + "name": "stdout", + "output_type": "stream", + "text": [ + "The length of half-wave dipole is 7.125 m\n" + ] + } + ], + "source": [ + "#calculate the length of half wave dipole\n", + "#page no 564\n", + "#given\n", + "#prob no. 16.1\n", + "#Determination of length of half-wave dipole\n", + "#given\n", + "f=20.;#Operating freq in MHz\n", + "#calculations\n", + "L=142.5/f;\n", + "#results\n", + "print 'The length of half-wave dipole is',L,'m'" + ] + }, + { + "cell_type": "markdown", + "metadata": {}, + "source": [ + "## Example 2 : pg 566" + ] + }, + { + "cell_type": "code", + "execution_count": 7, + "metadata": { + "collapsed": false + }, + "outputs": [ + { + "name": "stdout", + "output_type": "stream", + "text": [ + "The efficiency of dipole antenna is 93.1 %\n" + ] + } + ], + "source": [ + "#calculate the efficiency of dipole antenna \n", + "#page no 566\n", + "#prob no. 16.2\n", + "#given\n", + "#A dipole antenna with radiatn resistance=67ohm & loss resistance 5ohm\n", + "Rr=67.;Rl=5;\n", + "#calculations\n", + "#Determination of efficiency \n", + "eta=Rr/(Rr+Rl);\n", + "#results\n", + "print 'The efficiency of dipole antenna is',round(eta*100,1),'%'" + ] + }, + { + "cell_type": "markdown", + "metadata": {}, + "source": [ + "## Example 3 : pg 571" + ] + }, + { + "cell_type": "code", + "execution_count": 6, + "metadata": { + "collapsed": false + }, + "outputs": [ + { + "name": "stdout", + "output_type": "stream", + "text": [ + "Second antenna with gain=4.5dBd has higher gain\n" + ] + } + ], + "source": [ + "#calculate whether the first or second antenna has higher gain \n", + "#page no 569\n", + "#prob no. 16.3\n", + "#given\n", + "#Two antennas with gain 5.3dBi & 4.5dBd\n", + "#Converting unit dBd in dBi for comparison\n", + "G1_dBi=5.3;G2_dBd=4.5;\n", + "G2_dBi=2.14+G2_dBd;\n", + "#calculations and results\n", + "if G2_dBi > G1_dBi:\n", + " print 'Second antenna with gain=4.5dBd has higher gain'\n", + "else:\n", + " print 'First antenna with gain=5.3dBi has higher gain '" + ] + }, + { + "cell_type": "markdown", + "metadata": {}, + "source": [ + "## Example 4 : pg 571" + ] + }, + { + "cell_type": "code", + "execution_count": 4, + "metadata": { + "collapsed": false + }, + "outputs": [ + { + "name": "stdout", + "output_type": "stream", + "text": [ + "The gain is 1.434 dBi\n" + ] + } + ], + "source": [ + "#calculate the gain\n", + "#page no 571\n", + "#prob no. 16.4\n", + "#given\n", + "from math import log10\n", + "#A dipole antenna with efficency=85% given\n", + "n=0.85;D_dBi=2.14;#Directivity in dBi\n", + "#calculations\n", + "#Determination of gain in dB\n", + "D=10**(D_dBi/10);\n", + "G=D*n;#Determination of gain\n", + "G_dBi=10*log10(G);#Converting to dBi\n", + "#results\n", + "print 'The gain is',round(G_dBi,3),'dBi'" + ] + }, + { + "cell_type": "markdown", + "metadata": {}, + "source": [ + "## Example 6 : pg 573" + ] + }, + { + "cell_type": "code", + "execution_count": 8, + "metadata": { + "collapsed": false + }, + "outputs": [ + { + "name": "stdout", + "output_type": "stream", + "text": [ + "EIRP in dBm is expressed as 44.444 dBm\n" + ] + } + ], + "source": [ + "#calculate the EIRP in dBm \n", + "#page no 573\n", + "#prob no. 16.6\n", + "#given\n", + "from math import log10\n", + "#ERP of Tx statn=17W\n", + "ERP=17.;\n", + "#calculations\n", + "#Determnation of EIRP\n", + "ERP_dBm=10*log10(ERP/10**-3);#Converting ERP in dBm\n", + "EIRP_dBm=ERP_dBm+2.14;#Converting ERP in EIRP\n", + "#results\n", + "print 'EIRP in dBm is expressed as',round(EIRP_dBm,3),'dBm'" + ] + }, + { + "cell_type": "markdown", + "metadata": {}, + "source": [ + "## Example 7 : pg 582" + ] + }, + { + "cell_type": "code", + "execution_count": 9, + "metadata": { + "collapsed": false + }, + "outputs": [ + { + "name": "stdout", + "output_type": "stream", + "text": [ + "a)1.The optimum diameter for antenna is 0.0795774715459 m\n", + "a)2.The spacing for the antenna 0.0625 m\n", + "a)3.The total length of an antenna is 0.5 m\n", + "b)The antenna gain is 14.7712125472 dBi\n", + "The beamwidth is 36.7695526217 degree\n" + ] + } + ], + "source": [ + "#calculate the beam width, optimum diameter, spacing, total length \n", + "#page no 582\n", + "#prob no. 16.7\n", + "#given\n", + "from math import pi, log10, sqrt\n", + "#a helial antenna with 8 turns with freq=1.2GHz given\n", + "N=8.;f=1.2*10**9;c=3*10**8;#Speed of light in m/s\n", + "#calculations and results\n", + "#a)Determination of optimum diameter of antenna\n", + "wav=c/f;\n", + "D=wav/pi;\n", + "print 'a)1.The optimum diameter for antenna is',D,'m'\n", + "S=wav/4;#Determination of spacing for the antenna\n", + "print 'a)2.The spacing for the antenna',S,'m'\n", + "L=N*S;#Determination of total length of an antenna\\\n", + "print 'a)3.The total length of an antenna is',L,'m'\n", + "#b)Determination of antenna gain in dBi\n", + "G=(15*N*S*(pi*D)**2)/(wav**3);\n", + "G_dBi=10*log10(G);#Converting in dBi\n", + "print 'b)The antenna gain is',G_dBi,'dBi'\n", + "#c)determination of beamwidth\n", + "theta=((52*wav)/(pi*D))*sqrt(wav/(N*S));\n", + "print 'The beamwidth is',theta,'degree'" + ] + }, + { + "cell_type": "markdown", + "metadata": {}, + "source": [ + "## Example 8 : pg 590" + ] + }, + { + "cell_type": "code", + "execution_count": 10, + "metadata": { + "collapsed": false + }, + "outputs": [ + { + "name": "stdout", + "output_type": "stream", + "text": [ + "The length of elements are\n", + "L5= 1.85469596002 m L4= 1.29828717201 m L3= 0.908801020408 m L2= 0.636160714286 m L1= 0.4453125 m \n", + "The spacing between elements are\n", + "D5= 3.46090977769 m D4= 2.42263684438 m D3= 1.69584579107 m D2= 1.18709205375 m D1= 0.830964437623 m \n" + ] + } + ], + "source": [ + "#calculate the length and spacing \n", + "#page no 590\n", + "#prob no. 16.8\n", + "from math import pi,tan\n", + "#Design of log periodic antenna to cover freq 100-300MHz & t=0.7,a=30 degree\n", + "t=0.7;a=30;\n", + "#For good performance converting range to 90MHz to 320MHz\n", + "f2=90.;f1=320.;\n", + "#Determination of lengths of elements\n", + "L1=142.5/f1;#For freq of 320MHz\n", + "L2=L1/t;L3=L2/t;L4=L3/t;L5=L4/t;\n", + "print 'The length of elements are'\n", + "print 'L5=',L5,'m ','L4=',L4,'m ','L3=',L3,'m ','L2=',L2,'m ','L1=',L1,'m '\n", + "#Determination of spacing betn elements\n", + "D1=L1/(2*tan(a*pi/180./2.));\n", + "D2=D1/t;D3=D2/t;D4=D3/t;D5=D4/t;\n", + "print 'The spacing between elements are'\n", + "print 'D5=',D5,'m','D4=',D4,'m ','D3=',D3,'m ','D2=',D2,'m ','D1=',D1,'m '" + ] + }, + { + "cell_type": "markdown", + "metadata": {}, + "source": [ + "## Example 9 : pg 598" + ] + }, + { + "cell_type": "code", + "execution_count": 11, + "metadata": { + "collapsed": false + }, + "outputs": [ + { + "name": "stdout", + "output_type": "stream", + "text": [ + "The beamwidth is 1.75 degree\n", + "The gain is 39.766 dBi\n" + ] + } + ], + "source": [ + "#calculate the gain and beamwidth\n", + "#page no 598\n", + "#prob no. 16.9\n", + "from math import pi, log10\n", + "#given\n", + "#A parabolic antenna with diameter=3m & efficiency=60% operate at 4GHz\n", + "D=3.;n=0.6;f=4.*10**9;c=3.*10**8;#Spped of light\n", + "#Determination of gain & beamwidth\n", + "#calculations and results\n", + "wav=c/f;#Determination of free space wavelength\n", + "theta=(70.*wav)/D;#Calculaing beamwidth\n", + "print 'The beamwidth is',theta,'degree'\n", + "G=(n*(pi**2)*(D**2))/wav**2;#Calculating gain\n", + "#Converting gain in dBi\n", + "G_dBi=10*log10(G);\n", + "print 'The gain is',round(G_dBi,3),'dBi'" + ] + } + ], + "metadata": { + "kernelspec": { + "display_name": "Python 2", + "language": "python", + "name": "python2" + }, + "language_info": { + "codemirror_mode": { + "name": "ipython", + "version": 2 + }, + "file_extension": ".py", + "mimetype": "text/x-python", + "name": "python", + "nbconvert_exporter": "python", + "pygments_lexer": "ipython2", + "version": "2.7.11" + } + }, + "nbformat": 4, + "nbformat_minor": 0 +} |