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{
"cells": [
{
"cell_type": "markdown",
"metadata": {},
"source": [
"# Chapter 7: Loop Antenna"
]
},
{
"cell_type": "markdown",
"metadata": {},
"source": [
"## Example 7.10_1: Input_Voltage.sce"
]
},
{
"cell_type": "code",
"execution_count": null,
"metadata": {
"collapsed": true
},
"outputs": [],
"source": [
"//Example No. 7.10.1\n",
"clc;\n",
"clear;\n",
"close;\n",
"format('v',6);\n",
"A=1;//m²(Area of loop)\n",
"N=400;//no. of turns\n",
"Q=100;//Quality factor\n",
"theta=60;//degree(angle)\n",
"Erms=10;//µV/m(field strength)\n",
"f=1;//MHz(tuned frequency)\n",
"c=3*10^8;//m/s////Speed of light\n",
"lambda=c/(f*10^6);//m(Wavelength)\n",
"Vr=Q*2*%pi*A*N*cosd(theta)*Erms*10^-6/lambda;//V(reciever input voltage)\n",
"disp(Vr*1000,'Input voltage to the receiver in mV : ');"
]
}
,
{
"cell_type": "markdown",
"metadata": {},
"source": [
"## Example 7.10_2: Voltage_induced_in_lop.sce"
]
},
{
"cell_type": "code",
"execution_count": null,
"metadata": {
"collapsed": true
},
"outputs": [],
"source": [
"//Example No. 7.10.2\n",
"clc;\n",
"clear;\n",
"close;\n",
"format('v',7);\n",
"N=12;//no. of turns\n",
"A=1;//m²(Area of loop)\n",
"Erms=100;//µV/m(field strength)\n",
"f=10;//MHz(tuned frequency)\n",
"theta=0;//degree(angle)\n",
"c=3*10^8;//m/s////Speed of light\n",
"lambda=c/(f*10^6);//m(Wavelength)\n",
"Vr=2*%pi*A*N*cosd(theta)*Erms*10^-6/lambda;//V(reciever input voltage)\n",
"disp(Vr*10^6,'Voltage induced in loop in µV/m : ');"
]
}
,
{
"cell_type": "markdown",
"metadata": {},
"source": [
"## Example 7.10_3: Find_the_field_strength.sce"
]
},
{
"cell_type": "code",
"execution_count": null,
"metadata": {
"collapsed": true
},
"outputs": [],
"source": [
"//Example No. 7.10.3\n",
"clc;\n",
"clear;\n",
"close;\n",
"format('v',6);\n",
"N=25;//no. of turns\n",
"Vrms=150;//µV(emf induced)\n",
"f=500;//kHz(tuned frequency)\n",
"A=0.5^2;//m²(Area of loop)\n",
"theta=0;//degree(angle)\n",
"c=3*10^8;//m/s////Speed of light\n",
"lambda=c/(f*10^3);//m(Wavelength)\n",
"Erms=lambda/(2*%pi*A*N*cosd(theta))*Vrms*10^-6;//V/m(maximum emf induced)\n",
"disp(Erms*10^3,'Field strength in mV/m : ');"
]
}
,
{
"cell_type": "markdown",
"metadata": {},
"source": [
"## Example 7.10_4: Radiation_Resistance.sce"
]
},
{
"cell_type": "code",
"execution_count": null,
"metadata": {
"collapsed": true
},
"outputs": [],
"source": [
"//Example No. 7.10.4\n",
"clc;\n",
"clear;\n",
"close;\n",
"format('v',7);\n",
"N1=1;//no. of turns in primary\n",
"N2=8;//no. of turns in secondary\n",
"//a=lambda/25;\n",
"aBYlambda=1/25;//(temporary calculation)\n",
"//A=%pi*a^2\n",
"A_BY_lambda_sqr=%pi*aBYlambda^2;//(temporary calculation)\n",
"Rr1=31200*(N1*A_BY_lambda_sqr)^2;//Ω(Radiation resistance for single turn)\n",
"disp(Rr1,'Radiation resistance for single turn loop in Ω : ');\n",
"Rr2=31200*(N2*A_BY_lambda_sqr)^2;//Ω(Radiation resistance for 8 turn)\n",
"disp(Rr2,'Radiation resistance for 8 turn loop in Ω : ');"
]
}
,
{
"cell_type": "markdown",
"metadata": {},
"source": [
"## Example 7.10_5: Radiation_Efficiency.sce"
]
},
{
"cell_type": "code",
"execution_count": null,
"metadata": {
"collapsed": true
},
"outputs": [],
"source": [
"//Example No. 7.10.5\n",
"clc;\n",
"clear;\n",
"close;\n",
"format('v',6);\n",
"f=100;//MHz(Operating frequency)\n",
"c=3*10^8;//m/s////Speed of light\n",
"lambda=c/(f*10^6);//m(Wavelength)\n",
"a=lambda/25;//m(radius)\n",
"C=2*%pi*a;//m(Circumference)\n",
"d=2*10^-4*lambda;//m(Spacing)\n",
"disp('For single turn : ');\n",
"N=1;//n. of turns\n",
"RL_BY_Rr=3430/(C^3*f^(3.5)*N*d);//(temporary calculation)\n",
"K=1/(1+RL_BY_Rr)*100;//%(Radiation efficiency)\n",
"disp(K,'Radiation efficiency of single turn in % : ');\n",
"disp('For Eight turn : ');\n",
"N=8;//no. of turns\n",
"RL_BY_Rr=3430/(C^3*f^(3.5)*N*d);//(temporary calculation)\n",
"K=1/(1+RL_BY_Rr)*100;//%(Radiation efficiency)\n",
"disp(K,'Radiation efficiency of eight turn in % : ');"
]
}
,
{
"cell_type": "markdown",
"metadata": {},
"source": [
"## Example 7.10_6: Directivity.sce"
]
},
{
"cell_type": "code",
"execution_count": null,
"metadata": {
"collapsed": true
},
"outputs": [],
"source": [
"//Example No. 7.10.6\n",
"clc;\n",
"clear;\n",
"close;\n",
"format('v',6);\n",
"a=0.5;//m(radius)\n",
"f=0.9;//MHz(OPerating frequency)\n",
"c=3*10^8;//m/s////Speed of light\n",
"lambda=c/(f*10^6);//m(wavelength)\n",
"C=2*%pi*a;//m(Circumference)\n",
"if C/lambda<1/3 then\n",
" D=3/2;//Directivity\n",
"elseif C/lambda>1/3 then\n",
" D=0.682*C/lambda;//Directivity\n",
"end\n",
"disp(D,'Directivity : ');"
]
}
],
"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
}
|
