Electrically Small, Superdirective, and Superconducting Antennas

A seminal reference to electrically small antennas for today's wireless and Wi-Fi world This book is dedicated to the challenges posed by electrically small antennas and their solutions. Electrically small antennas have characteristics that limit performance: low radiation resistance, high reactance, low efficiency, narrow bandwidth, and increased loss in the matching network. Most of these limitations are shared by two other classes of antennas: superdirective and superconducting antennas. All three classes of antennas are thoroughly treated in three interrelated parts: * Part One, Electrically Small Antennas, begins with a discussion of the fundamental limitations of bandwidth and matching, then provides detailed design information on loaded whips and dipoles, ferrite loops, patches with unusual substrates, and dielectric resonator antennas. In addition to exploring designs that work, the author sets forth antenna designs that are based on good physics yet are poor performers, as well as designs with both poor underlying physics and poor performance. * Part Two, Superdirective Antennas, sets forth basic capabilities and limitations of superdirective antennas, both apertures and arrays, and investigates bandwidth, efficiency, and tolerances. The author explores the magnification of intrinsic matching circuit loss due to a large mismatch and evaluates the recent and promising non-Foster matching circuits. * Part Three, Superconducting Antennas, reviews superconductivity concepts and new principles for dipole, loop, and patch antennas. The author concludes with a discussion of superconducting delay lines for wideband phased array steering. Throughout the book, the author provides readers with a historical perspective, setting forth what has been investigated, what works, and what does not. Each part has its own author index and a list of references to help readers continue their explorations of particular topics.With the explosive demand for wireless and Wi-Fi, this seminal reference is essential reading for all antenna professionals and is recommended as a graduate-level course book.

A seminal reference to electrically small antennas for today'swireless and Wi-Fi worldThis book is dedicated to the challenges posed by electricallysmall antennas and their solutions. Electrically small antennashave characteristics that limit performance: low radiationresistance, high reactance, low efficiency, narrow bandwidth, andincreased loss in the matching network. Most of these limitationsare shared by two other classes of antennas: superdirective andsuperconducting antennas. All three classes of antennas arethoroughly treated in three interrelated parts:* Part One, Electrically Small Antennas, begins with a discussionof the fundamental limitations of bandwidth and matching, thenprovides detailed design information on loaded whips and dipolesferrite loops, patches with unusual substrates, and dielectricresonator antennas. In addition to exploring designs that work, theauthor sets forth antenna designs that are based on good physicsyet are poor performers, as well as designs with both poorunderlying physics and poor performance.* Part Two, Superdirective Antennas, sets forth basic capabilitiesand limitations of superdirective antennas, both apertures andarrays, and investigates bandwidth, efficiency, and tolerances. Theauthor explores the magnification of intrinsic matching circuitloss due to a large mismatch and evaluates the recent and promisingnon-Foster matching circuits.* Part Three, Superconducting Antennas, reviews superconductivityconcepts and new principles for dipole, loop, and patch antennas.The author concludes with a discussion of superconducting delaylines for wideband phased array steering.Throughout the book, the author provides readers with a historicalperspective, setting forth what has been investigated, what worksand what does not. Each part has its own author index and a list ofreferences to help readers continue their explorations ofparticular topics.With the explosive demand for wireless and Wi-Fithis seminal reference is essential reading for all antennaprofessionals and is recommended as a graduate-level course book.

Preface.1: ELECTRICALLY SMALL ANTENNAS.1.1 Introduction.1.2 Fundamental Limitations.1.3 Electrically Small Antennas: Canonical Types.1.4 Clever Physics, but Bad Numbers.1.5 Pathological Antennas.1.6 ESA Summary.References.Index.2: SUPERDIRECTIVE ANTENNAS.2.1 History and Motivation.2.2 Maximum Directivity.2.3 Constrained Superdirectivity.2.4 Bandwidth, Efficiency, and Tolerances.2.5 Miscellaneous Superdirectivity.2.6 Matching Circuit Loss Magnification.2.7 Non-Foster Matching Circuits.2.8 SD Antenna Summary.References.Index.3: SUPERCONDUCTING ANTENNAS.3.1 Introduction.3.2 Superconductivity Concepts for Antenna Engineers.3.3 Dipole, Loop, and Patch Antennas.3.4 Phasers and Delay Lines.3.5 SC Antenna Summary.References.Subject Index.