GUJARAT TECHNOLOGICAL UNIVERSITY Electronics & Telecommunication Engineering B. SEMESTER: VI Subject Name: Antenna and Wave Propagation Sr.
Sky Wave Propagation – Formation of Ionospheric Layers and Antennas. Scilab Textbook Companion for Antenna and Wave Propagation by GSN Raju.
Course Content Basic antenna concepts: Total Hrs. 3 Definition and functions of an antenna, comparison between an antenna & transmission line, radio communication link with transmitting antenna and a receiving antenna, radiation patterns of antennas-field and power patterns, all antenna types.
Radiation of Electric dipole: 5 Potential functions and the electromagnetic field, Oscillating electric dipolederivations for E and H field components in spherical coordinate systems, Power Radiated by a current element, Application to antennas, Radiation from quaterwave monopole and half wave dipoles, Derivation for radiation resistance, application of reciprocity theorem to antennas, equality of directional patterns and effective lengths of transmitting and receiving antennas, directional properties of dipole antennas,antenna feeding methods. Antenna parameters and definitions: 5 beam area, beam width- Half-Power Beam width (HPBW)and First Null Beam width(FNBW),Polarisation,Radiation Intensity,Beam Efficiency, Directivity and directive gain, radiation resistance, radiation efficiency, resolution, Antenna aperture-physical and effective apertures, effective height, transmission formula, antenna field zones, Transmission loss as a function of frequency.Antenna temperature and signal to noise ratio. Arrays of point sources: 6 Expression for electric fields from two, three and N element arrays- linear arrays: Broad-side array and End-Fire array- Method of pattern multiplication- Binomial array-Horizontal and Vertical Antennas above the ground plane, Effect of ground on ungrounded antenna, Schelkunoff theorems for linear arrays, Dolph-Tchebysheff distribution for linear arrays. Loop Antenna: Small loop short magnetic dipole, comparison of far field of small loop and short dipole loop antennas, field pattern of circular loop antenna & radiation resistance of loop antenna, directivity of circular loop antennas 2 with uniform current. 2 Helical antenna: Helical geometry, transmission radiation modes, practical considerations, wide band characteristics of helical antenna. Design Arrays of dipoles & apertures: 4 3 element dipole Array with parasitic elements,Yagi-uda array-function and its design, Phased arrays, frequency scanning arrays, smart antennas, long wire antennas, location methods of feeding antennas, folded dipole antennas, matching arrangements. 4 Reflector antennas: Parabolic reflector, paraboloid reflector, aperture Pattern of large circular apertures with uniform illumination, off axis operation of paraboloid reflectors,Cassegrain feed system.
3 Slot patch & Horn antennas: Slot antenna, its pattern,Babinet’s principle and complementary antennas, impedance of slot antennas, and horn antenna-function and types. Microstrip ( patch) antennas: 4 Rectangular and circular types-function, features analysis,design considerations and applications 11. Lens antennas: 2 Nonmetallic Dielectric lens and artificial dielectric lens antennas, reflector lens antennas. Broadband & Freq. Independent antennas: Broadband antennas.
Antenna, Frequency.independent 2 antenna, log periodic 13. Antennas for special applications: 2 Antennas design consideration for satellite communication, antenna for terrestrial mobile communication systems, GPR, Embedded antennas, UWB, Plasma antenna. Antennas measurements: Experimental set ups for Measurement of radiation patterns, gain, phase polarization, terminal impedance. Radio wave propagation: Modes of propagation, Ground Wave Propgation,Structure of troposphere and ionosphere, Characteristic of Ionospheric layers, Sky wave propagation, Definitions for Virtual height, MUF and Skip distance, OWF, Fading,ionospheric absorptions, Multi-hop propagation, Space wave propagation and Super refraction.
Text Book: 1. Antennas for all applications 3 edition. By J.D.Krauss, TMH. Electromagnetic wave & radiating systems by Jordan & Balmain, PHI Publication. Antenna & Wave Propagation by K.D. Prasad, Satyaprakash Publications.
References Books: 1. Antenna Theory: Analysis and design –C. Balanis,Wiley India. Antenna and wave propagation By G.S.N. Raju,Pearson Education List of experiments: 1.
To study the variation of field strength of radiated with distance from transmitting antenna 2. To plot the radiation pattern of an Omni directional antenna.(Polar plot on log/linear scales & Cartesian plot on log/linear scales) 3. To plot radiation pattern of directional antenna.(Polar plot of Azimuth & Elevation planes on log/linear scales and Cartesian plot on log scales) 4. To study the phenomenon of linear and circular polarization of antennas.
To demonstrate that the transmitting and receiving radiation patterns of an antenna are equal and hence confirm the reciprocity theorem of antennas. To study and plot the radiation pattern of the dipole/Folded dipole antennas. Trey songz na na remix free mp3 download. To study and plot the radiation pattern of the monopole/whip/collinear antenna. To study and plot the radiation pattern of the end fire array (L/2) antenna & L/4 phased array (W8JK antenna).