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diff --git a/Microwave_Devices_And_Circuits_by_S._Y._Liao/chapter11.ipynb b/Microwave_Devices_And_Circuits_by_S._Y._Liao/chapter11.ipynb new file mode 100755 index 00000000..9b93e297 --- /dev/null +++ b/Microwave_Devices_And_Circuits_by_S._Y._Liao/chapter11.ipynb @@ -0,0 +1,187 @@ +{
+ "metadata": {
+ "name": "",
+ "signature": "sha256:ad12bff96918abc5e35ecb69ed85dad3776e4014893a3bdddb23c1bfeff5820d"
+ },
+ "nbformat": 3,
+ "nbformat_minor": 0,
+ "worksheets": [
+ {
+ "cells": [
+ {
+ "cell_type": "heading",
+ "level": 1,
+ "metadata": {},
+ "source": [
+ "Chapter11:STRIP LINES"
+ ]
+ },
+ {
+ "cell_type": "heading",
+ "level": 2,
+ "metadata": {},
+ "source": [
+ "Eg11.1.1:pg-495"
+ ]
+ },
+ {
+ "cell_type": "code",
+ "collapsed": false,
+ "input": [
+ "import math\n",
+ "#calculation of characteristic impedance Z0 of the line\n",
+ "er=5.23 #relative dielectric constant of the board material\n",
+ "h=7 #height from microstrip line to the ground in mils\n",
+ "t=2.8 #thickness of the microstrip line in mils\n",
+ "w=10 #width of the microstrip line in mils\n",
+ "Z0=(87*(math.log((5.98*h)/(t+(0.8*w)))))/sqrt(er+1.41) \n",
+ "print\"The characteristic impedance of the line(in ohms)is =\",round(Z0,2),\"ohms\" #calculation mistake in book"
+ ],
+ "language": "python",
+ "metadata": {},
+ "outputs": [
+ {
+ "output_type": "stream",
+ "stream": "stdout",
+ "text": [
+ "The characteristic impedance of the line(in ohms)is = 45.74 ohms\n"
+ ]
+ }
+ ],
+ "prompt_number": 13
+ },
+ {
+ "cell_type": "heading",
+ "level": 2,
+ "metadata": {},
+ "source": [
+ "Eg11.2.1:pg-505"
+ ]
+ },
+ {
+ "cell_type": "code",
+ "collapsed": false,
+ "input": [
+ "import math\n",
+ "#(a) Calculate the required width w of the conducting strip in order to have a characteristic impedance of 50 ohms \n",
+ "erd=6 #relative dielectric constant of BeO\n",
+ "d=4*(10**-3) #thickness in meter\n",
+ "Z0=50 #characteristic impedance in ohms\n",
+ "w=(377*(d))/((sqrt(erd))*Z0) \n",
+ "print\"The required width of the conducting strip(in metres)is =\",\"{:.3e}\".format(w),\"m\"\n",
+ "\n",
+ "#(b) Calculate the strip line capacitance\n",
+ "ed=8.854*(10**-12)*erd \n",
+ "d=4*(10**-3) #thickness in meter\n",
+ "C=(ed*round(w,5))/d #strip line capacitance\n",
+ "C=C*(10**12) #multiply C by 10**12 for converting it in pF/m\n",
+ "print\"The strip line capacitance(in pF/m)is =\",round(C,1),\"pF/m\"\n",
+ "\n",
+ "#(c) Calculate the strip line inductance\n",
+ "uc=4*math.pi*(10**-7) #permeability of the conductor\n",
+ "d=4*(10**-3) #thickness in meter\n",
+ "L=(uc*d)/w \n",
+ "L=L*(10**6) #converting L in micro H/m\n",
+ "print\"The strip line inductance(in uH/m)is =\",round(L,2),\"micro H/m\" \n",
+ "\n",
+ "#(d)Calculate the phase velocity of the wave in the parallel strip line\n",
+ "c=3*(10**8) #speed of light in meter/second\n",
+ "vp=c/sqrt(erd) \n",
+ "print\"The phase velocity of the wave in the parallel strip line(in m/s)is =\",\"{:.2e}\".format(vp),\"m/s\""
+ ],
+ "language": "python",
+ "metadata": {},
+ "outputs": [
+ {
+ "output_type": "stream",
+ "stream": "stdout",
+ "text": [
+ "The required width of the conducting strip(in metres)is = 1.231e-02 m\n",
+ "The strip line capacitance(in pF/m)is = 163.5 pF/m\n",
+ "The strip line inductance(in uH/m)is = 0.41 micro H/m\n",
+ "The phase velocity of the wave in the parallel strip line(in m/s)is = 1.22e+08 m/s\n"
+ ]
+ }
+ ],
+ "prompt_number": 16
+ },
+ {
+ "cell_type": "heading",
+ "level": 2,
+ "metadata": {},
+ "source": [
+ "Eg11.3.1:pg-507"
+ ]
+ },
+ {
+ "cell_type": "code",
+ "collapsed": false,
+ "input": [
+ "#Determine the characteristic impedance of the coplanar strip line\n",
+ "Pavg=250*(10**-3) #average power flowing in the positive z direction in watt\n",
+ "Io=100*(10**-3) #total peak current in ampere\n",
+ "Z0=(2*Pavg)/(Io**2) \n",
+ "print\"The characteristic impedance of the coplanar strip line(in ohms)is =\",int(round(Z0)),\"ohms\""
+ ],
+ "language": "python",
+ "metadata": {},
+ "outputs": [
+ {
+ "output_type": "stream",
+ "stream": "stdout",
+ "text": [
+ "The characteristic impedance of the coplanar strip line(in ohms)is = 50 ohms\n"
+ ]
+ }
+ ],
+ "prompt_number": 17
+ },
+ {
+ "cell_type": "heading",
+ "level": 2,
+ "metadata": {},
+ "source": [
+ "Eg11.4.1:pg-508"
+ ]
+ },
+ {
+ "cell_type": "code",
+ "collapsed": false,
+ "input": [
+ "import math\n",
+ "#(a)Calculate the K factor\n",
+ "er=2.56 #dielectric constant of the insulator(polystyrene)\n",
+ "w=25.0 #strip width in mils\n",
+ "t=14.0 #strip thickness in mils\n",
+ "d=70 #shield depth in mils\n",
+ "K=1.0/(1-(t/d)) \n",
+ "print\"The K factor is =\",K\n",
+ "\n",
+ "#(b)Calculate the fringe capacitance\n",
+ "Cf=round(((8.854*er)*(round((2*K*math.log(K+1)),3)-round(((K-1)*math.log((K**2)-1)),2))),)/round(math.pi,2)\n",
+ "print\"The fringe capacitance(in pF/m)is =\",round(Cf,2),\"pF/m\" \n",
+ "\n",
+ "#(c) Calculate the characteristic impedance of the line\n",
+ "Z0=94.15/((((w/d)*K)+(round(Cf,2)/(8.854*er)))*(sqrt(er))) \n",
+ "print\"The characteristic impedance of the line(in ohms)is =\",round(Z0,3),\"ohms\" #answer is wrong in book"
+ ],
+ "language": "python",
+ "metadata": {},
+ "outputs": [
+ {
+ "output_type": "stream",
+ "stream": "stdout",
+ "text": [
+ "The K factor is = 1.25\n",
+ "The fringe capacitance(in pF/m)is = 15.61 pF/m\n",
+ "The characteristic impedance of the line(in ohms)is = 51.839 ohms\n"
+ ]
+ }
+ ],
+ "prompt_number": 20
+ }
+ ],
+ "metadata": {}
+ }
+ ]
+}
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