Antennas And Wave Propagation By Gsnraju Free
GUJARAT TECHNOLOGICAL UNIVERSITY Electronics & Telecommunication Engineering B. SEMESTER: VI Subject Name: Antenna and Wave Propagation Sr. 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.
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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.
Antennas and Wave Propagation G.S.N. Raju The book is written for the first course on antennas and wave propagation. The book begins with an introduction that discusses the fundamental concepts, notations, representation and principles that govern the field of antennas.
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.