antennas basics

ECE 306 Antennas And ECE 306 Antennas And PropagationPrerequisite: ECE202 Transmission Line and FieldsCourse Objectives: Enable the students acquaint with antenna terminology, antenna and array principles and antenna analysis thereby formulating link budget for different communication Links. Provide in depth knowledge to students in designing antennas for frequencies ranging from KHz ~THz. Introduce students the type of antennas used in Terrestrial communication, Satellite communication and modern wireless communication. Introduce various modes of Electromagnetic wave propagation and provide knowledge of propagation effects in different medium. SyllabusBooks BooksReferenceGrading Policy Grading PolicyCAT-I 15 Marks CAT II 15 M k CAT-II 15 MarksQuiz-I, II, II 15 MarksAssignment / Antenna Simulation 5 MarksWhat this course is about?We will study electric and magnetic fields The electromagnetic field splits into two independent parts:Electrostatics: (q, E) Static charge The static approximation is valid when the dimensionMagnetostatics: (I, B)Constant current The static approximation is valid when the dimensionof the circuit is small compared to the electrical wavelength.Concepts of Frequency and Wavelength Concepts of Frequency and WavelengthExample: a circuit working at 60 Hz Example:a circuit working at 60 Hz.0= c / f- wavelength in vacuumc = 2.99792458 108m/s f = 60 HzThis gives:0= 4.9965106m4 996 5 k = 4,996.5kmMost circuits fall into the static-approximation category at 60 Hz.Maxwells Equation Maxwell s EquationThe behavior of electric and magnetic waves can be fully described by a set of four equations (which we have learned already). q ( y)Faradays Law of inductionAmperes LawGausss Law for electricityGausss Law for magnetismPlane Wave Properties Plane Wave PropertiesWhat is an antenna? What is an antenna? An antenna is a passive structure that serves An antenna is a passive structure that serves as transition between a transmission line and air. A device used to efficiently transmit and/or receive electromagnetic waves.Source SourceTxReceiver CircuitRxNational Atmoshpheric National Atmoshpheric Research Lab (NARL), MST Radar, GadankiCurrent distribution on linear dipoles