00653nam1 2200253 450 99000998406040332120150714144958.0000998406FED01000998406(Aleph)000998406FED0100099840620150714g19941996km-y0itay50------baitaITa-------001yyMetropoli e mobilitàil caso di BresciaBresciaSintesi Editrice1994-1996v.ill.23 cmTrasporti urbaniBresciaITUNINARICAUNIMARCBK990009984060403321DINSTUNINA00897nam a2200253 i 4500991001000639707536101217s2011 it b 001 0 ita d9788838664908b13944691-39ule_instFacoltà SSPTita301Mongardini, Carlo119245Elementi di sociologia :temi e idee per il 21. secolo /Carlo MongardiniMilano :McGraw-Hill,c2011xvii, 273 p. ;25 cmScienze umaneBibliografia: pp. 263-270 SociologiaManuali.b1394469102-04-1417-12-10991001000639707536LE021 301.00 MON01.0112020000029854le021gE25.00-n- 00000.i1521186117-12-10Elementi di sociologia251513UNISALENTOle02017-12-10ma -itait 0005358nam 2200673Ia 450 991102009730332120200520144314.097866107212699781280721267128072126X9780470056844047005684397804700568200470056827(CKB)1000000000357059(EBL)281590(SSID)ssj0000263681(PQKBManifestationID)11225350(PQKBTitleCode)TC0000263681(PQKBWorkID)10275258(PQKB)11453221(MiAaPQ)EBC281590(OCoLC)85785180(Perlego)2787960(EXLCZ)99100000000035705920061013d2007 uy 0engur|n|---|||||txtccrUltra-wideband antennas and propagation for communications, radar and imaging /edited by Ben Allen ... [et al.]Chichester John Wileyc20071 online resource (509 p.)Description based upon print version of record.9780470032558 0470032553 Includes bibliographical references and index.Ultra-Wideband Antennas and Propagation for Communications, Radar and Imaging; Contents; Editors; Prime Contributors; Preface; Acknowledgments; Abbreviations & Acronyms; 1 Introduction to UWB Signals and Systems; 1.1 History of UWB; 1.2 Motivation; 1.2.1 Large Absolute Bandwidth; 1.2.2 Large Relative Bandwidth; 1.3 UWB Signals and Systems; 1.3.1 Impulse Radio; 1.3.2 DS-CDMA; 1.3.3 OFDM; 1.3.4 Frequency Hopping; 1.3.5 RADAR; 1.3.6 Geolocation; 1.4 Frequency Regulation; 1.5 Applications, Operating Scenarios and Standardisation; 1.6 System Outlook; References; Part I FundamentalsIntroduction to Part I2 Fundamental Electromagnetic Theory; 2.1 Introduction; 2.2 Maxwell's Equations; 2.2.1 Differential Formulation; 2.2.2 Interpretation; 2.2.3 Key to Antennas and Propagation; 2.2.4 Solving Maxwell's Equations; 2.2.5 Harmonic Representation; 2.3 Resulting Principles; References; 3 Basic Antenna Elements; 3.1 Introduction; 3.2 Hertzian Dipole; 3.2.1 Far-Field - Fraunhofer Region; 3.2.2 Near-Field - Fresnel Region; 3.3 Antenna Parameters and Terminology; 3.3.1 Polarisation; 3.3.2 Power Density; 3.3.3 Radiated Power; 3.3.4 Radiation Resistance; 3.3.5 Antenna Impedance3.3.6 Equivalent Circuit3.3.7 Antenna Matching; 3.3.8 Effective Length and Area; 3.3.9 Friis' Transmission Formula; 3.3.10 Radiation Intensity; 3.3.11 Radiation Pattern; 3.3.12 (Antenna) Bandwidth; 3.3.13 Directive Gain, Directivity, Power Gain; 3.3.14 Radiation Efficiency; 3.4 Basic Antenna Elements; 3.4.1 Finite-Length Dipole; 3.4.2 Monopole; 3.4.3 Printed Antennas; 3.4.4 Wideband and Frequency-Independent Elements; References; 4 Antenna Arrays; 4.1 Introduction; 4.2 Point Sources; 4.2.1 Point Sources with Equal Amplitude and Phase4.2.2 Point Sources with Equal Amplitude and 180 Degrees Phase Difference4.2.3 Point Sources of Unequal Amplitude and Arbitrary Phase Difference; 4.3 The Principle of Pattern Multiplication; 4.4 Linear Arrays of n Elements; 4.5 Linear Broadside Arrays with Nonuniform Amplitude Distributions; 4.5.1 The Binomial Distribution; 4.5.2 The Dolph-Tschebyscheff Distribution; 4.6 Planar Arrays; 4.6.1 Rectangular Arrays; 4.6.2 Circular Arrays 63; 4.7 Design Considerations; 4.7.1 Mutual Coupling; 4.7.2 Array Gain; 4.8 Summary; References; 5 Beamforming; 5.1 Introduction; 5.1.1 Historical Aspects5.1.2 Concept of Spatial Signal Processing5.2 Antenna Arrays; 5.2.1 Linear Array; 5.2.2 Circular Array; 5.2.3 Planar Array; 5.2.4 Conformal Arrays; 5.3 Adaptive Array Systems; 5.3.1 Spatial Filtering; 5.3.2 Adaptive Antenna Arrays; 5.3.3 Mutual Coupling and Correlation; 5.4 Beamforming; 5.4.1 Adaptive Antenna Technology; 5.4.2 Beam Steering; 5.4.3 Grating Lobes; 5.4.4 Amplitude Weights; 5.4.5 Window Functions; 5.5 Summary; References; 6 Antenna Diversity Techniques; 6.1 Introduction; 6.2 A Review of Fading; 6.2.1 Signal Fading; 6.2.2 Channel Distribution; 6.3 Receive Diversity6.3.1 Single Branch without DiversityProviding up-to-date material for UWB antennas and propagation as used in a wide variety of applications, ""Ultra-wideband Antennas and Propagation for Communications, Radar and Imaging"" includes fundamental theory, practical design information and extensive discussion of UWB applications from biomedical imaging, through to radar and wireless communications. An in-depth treatment of ultra-wideband signals in practical environments is given, including interference, coexistence and diversity considerations. The text includes antennas and propagation in biological media in addition to more coUltra-wideband antennasBroadband communication systemsUltra-wideband antennas.Broadband communication systems.621.3824621.38835Allen Ben(Benjamin Hugh)1656364MiAaPQMiAaPQMiAaPQBOOK9911020097303321Ultra-wideband4418099UNINA