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diff --git a/Microwave_Engineering_by_G_S_Raghuvanshi/12-Microwave_Measurements.ipynb b/Microwave_Engineering_by_G_S_Raghuvanshi/12-Microwave_Measurements.ipynb new file mode 100644 index 0000000..a88588e --- /dev/null +++ b/Microwave_Engineering_by_G_S_Raghuvanshi/12-Microwave_Measurements.ipynb @@ -0,0 +1,421 @@ +{ +"cells": [ + { + "cell_type": "markdown", + "metadata": {}, + "source": [ + "# Chapter 12: Microwave Measurements" + ] + }, +{ + "cell_type": "markdown", + "metadata": {}, + "source": [ + "## Example 12.10: Air_filled_cavity.sce" + ] + }, + { +"cell_type": "code", + "execution_count": null, + "metadata": { + "collapsed": true + }, + "outputs": [], +"source": [ +"//Page Number: 654\n", +"//Example 12.10\n", +"clc;\n", +"//Given\n", +"R1=10.6; //GHz\n", +"R2=8.30; //GHz\n", +"Q0=8200;\n", +"Q0d=890;\n", +"\n", +"Er=(R1/R2)^2;\n", +"disp(Er,'Dielectric constant');\n", +"\n", +"Qd=(Q0-Q0d)/(Q0*Q0d);\n", +"disp(Qd,'Loss tangent of dielectric');" + ] + } +, +{ + "cell_type": "markdown", + "metadata": {}, + "source": [ + "## Example 12.11: Rectangular_Waveguide.sce" + ] + }, + { +"cell_type": "code", + "execution_count": null, + "metadata": { + "collapsed": true + }, + "outputs": [], +"source": [ +"//Page Number: 654\n", +"//Example 12.11\n", +"clc;\n", +"//Given\n", +"l0=0.15; //cm\n", +"lmbg=2*2.24; //cm\n", +"le=1.14; //cm\n", +"a=2.286; //cm\n", +"d=2;\n", +"\n", +"B0=(2*%pi)/lmbg;\n", +"x=tan(B0*l0)/(B0*l0);\n", +"//Also\n", +"x1=(l0*x)/le;\n", +"//Correct value seems to be\n", +"Bele=2.786;\n", +"e1=((((a/%pi)^2)*(Bele/le)^2)+1);\n", +"e2=(((2*a)/lmbg)^2)+1;\n", +"Er=e1/e2;\n", +"disp(Er,'Er:');\n", +"\n", +"\n", +"//Answer in book for Er is given as 2.062 but it should be 2.038" + ] + } +, +{ + "cell_type": "markdown", + "metadata": {}, + "source": [ + "## Example 12.1: Microwave_diode.sce" + ] + }, + { +"cell_type": "code", + "execution_count": null, + "metadata": { + "collapsed": true + }, + "outputs": [], +"source": [ +"//Page Number: 649\n", +"//Example 12.1\n", +"clc;\n", +"//Given\n", +"Is=0.1*(10^-6); //A\n", +"Pi=0; //dBm\n", +"Cs=0.1*(10^-12); //F\n", +"Ls=2*(10^-9);\n", +"Cj=0.15*(10^-12); //F\n", +"Rs=10; //ohm\n", +"T=293; //K\n", +"nktbye=25*(10^-3); //V\n", +"\n", +"//Rj\n", +"Rj=(nktbye/Is);\n", +"disp('Kohm',Rj/1000,'Rj:');\n", +"\n", +"//Bi\n", +"Bi=nktbye/2;\n", +"Bii=Bi*1000;\n", +"disp('A/W',Bii,'Bi:');\n", +"\n", +"//Bv\n", +"Bv=Rj*Bii;\n", +"disp('V/W',Bv,'Bv:');" + ] + } +, +{ + "cell_type": "markdown", + "metadata": {}, + "source": [ + "## Example 12.2: Detector_mismatch.sce" + ] + }, + { +"cell_type": "code", + "execution_count": null, + "metadata": { + "collapsed": true + }, + "outputs": [], +"source": [ +"//Page Number: 650\n", +"//Example 12.2\n", +"clc;\n", +"//Given\n", +"vswr=4;\n", +"\n", +"modT=(vswr-1)/(vswr+1);\n", +"Lm=-10*log10(1-(modT*modT)); //dB\n", +"disp('dB',Lm,'Mismatch Loss:');\n", +"\n", +"//Sensitivity reduces by a factor\n", +"Bvd=(1-(modT*modT));\n", +"Bvdp=Bvd*100;\n", +"disp('%',Bvdp,'Voltge sensitivity reduces by:');\n", +"\n", +"\n", +"" + ] + } +, +{ + "cell_type": "markdown", + "metadata": {}, + "source": [ + "## Example 12.3: Transmission_waveguide.sce" + ] + }, + { +"cell_type": "code", + "execution_count": null, + "metadata": { + "collapsed": true + }, + "outputs": [], +"source": [ +"//Page Number: 650\n", +"//Example 12.3\n", +"clc;\n", +"//Given\n", +"f=10D+9; //Hz\n", +"c=3D+10; //cm/s\n", +"a=4; //cm\n", +"s=0.1; //cm\n", +"lmb=c/f; //cm\n", +"lmbg=lmb/(sqrt(1-((lmb/(2*a))^2)));\n", +"vswr=lmbg/(%pi*s);\n", +"disp(vswr,'VSWR:');\n", +"\n", +"//Answer in book for lmbg is given as 3.49 but it should be 3.23 and hence the answer will be 10.3" + ] + } +, +{ + "cell_type": "markdown", + "metadata": {}, + "source": [ + "## Example 12.4: VSWR_of_waveguide.sce" + ] + }, + { +"cell_type": "code", + "execution_count": null, + "metadata": { + "collapsed": true + }, + "outputs": [], +"source": [ +"//Page Number: 651\n", +"//Example 12.4\n", +"clc;\n", +"//Given\n", +"delx=3.5; //cm\n", +"s=0.25; //cm\n", +"\n", +"lmbg=2*delx;\n", +"vswr=lmbg/(%pi*s);\n", +"disp(vswr,'VSWR:');\n", +"\n", +"" + ] + } +, +{ + "cell_type": "markdown", + "metadata": {}, + "source": [ + "## Example 12.5: Directional_couplers.sce" + ] + }, + { +"cell_type": "code", + "execution_count": null, + "metadata": { + "collapsed": true + }, + "outputs": [], +"source": [ +"//Page Number: 651\n", +"//Example 12.5\n", +"clc;\n", +"//Given\n", +"vswr=2;\n", +"Pin=4.5D-3; //W\n", +"\n", +"modT=(vswr-1)/(vswr+1);\n", +"//Power reflected,\n", +"Pr=(modT^2)*Pin;\n", +"//As coupler samples only 1/1000th power\n", +"Prr=Pr*1000;\n", +"disp('W',Prr,'Reflected Power:');" + ] + } +, +{ + "cell_type": "markdown", + "metadata": {}, + "source": [ + "## Example 12.6: Microwave_line.sce" + ] + }, + { +"cell_type": "code", + "execution_count": null, + "metadata": { + "collapsed": true + }, + "outputs": [], +"source": [ +"//Page Number: 652\n", +"//Example 12.6\n", +"clc;\n", +"//Given\n", +"Z0=50; //ohm\n", +"p=2.4;\n", +"L=0.313;\n", +"x=2*%pi*L;\n", +"y=tan(x);\n", +"\n", +"Zl=(Z0*(1+(p*p*%i)))/(p+(p*%i));\n", +"T=(Zl-Z0)/(Zl+Z0);\n", +"p=sqrt((real(T))^2+(imag(T))^2);\n", +"disp(p,'Reflection coefficient:');\n", +"" + ] + } +, +{ + "cell_type": "markdown", + "metadata": {}, + "source": [ + "## Example 12.7: Microwave_line.sce" + ] + }, + { +"cell_type": "code", + "execution_count": null, + "metadata": { + "collapsed": true + }, + "outputs": [], +"source": [ +"//Page Number: 652\n", +"//Example 12.7\n", +"clc;\n", +"//Given\n", +"Zl=25+25*%i; //ohm\n", +"Z0=50; //ohm\n", +"\n", +"T=(Zl-Z0)/(Zl+Z0);\n", +"p=sqrt((real(T))^2+(imag(T))^2);\n", +"disp(p,'Reflection coefficient:');\n", +"\n", +"vswrr=(1+p)/(1-p);\n", +"disp(vswrr,'VSWR:');\n", +"\n", +"//Fraction of power delivered\n", +"Pd=1-(p^2);\n", +"Pdp=Pd*100;\n", +"disp('%',Pdp,'Fraction of power delivered:');" + ] + } +, +{ + "cell_type": "markdown", + "metadata": {}, + "source": [ + "## Example 12.8: Rectangular_waveguide.sce" + ] + }, + { +"cell_type": "code", + "execution_count": null, + "metadata": { + "collapsed": true + }, + "outputs": [], +"source": [ +"//Page Number: 653\n", +"//Example 12.8\n", +"clc;\n", +"//Given\n", +"d=2.4;//cm\n", +"lmbc=1.8;\n", +"c=3*10^10; //cm/s\n", +"\n", +"lmbg=2*d;\n", +"lmb=(lmbg*lmbc)/(sqrt(lmbg^2+lmbc^2));\n", +"//Operating frequency\n", +"f=c/lmb;\n", +"disp('GHz',f/10^9,'Operating frequency:');" + ] + } +, +{ + "cell_type": "markdown", + "metadata": {}, + "source": [ + "## Example 12.9: Three_port_circulator.sce" + ] + }, + { +"cell_type": "code", + "execution_count": null, + "metadata": { + "collapsed": true + }, + "outputs": [], +"source": [ +"//Page Number: 653\n", +"//Example 12.9\n", +"clc;\n", +"//Given\n", +"p=1.5;\n", +"IsL=1; //dB\n", +"InL=30; //dB\n", +"\n", +"S21=10^(-IsL/20);\n", +"\n", +"//Assuming tgree ports to be identical\n", +"S32=S21;\n", +"S13=S21;\n", +"\n", +"//Isolations are also the same\n", +"S31=10^(-InL/20);\n", +"S23=S31;\n", +"S12=S31;\n", +"\n", +"//Refelction coefficients are also the same\n", +"T=(p-1)/(p+1);\n", +"S11=T;\n", +"S22=T;\n", +"S33=T;\n", +"\n", +"S=[S11 S12 S13;S21 S22 S23;S31 S32 S33];\n", +"disp(S,'Matrix is:');\n", +"" + ] + } +], +"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 +} |