An Omnidirectional Frequency Independent Antenna
Author | : James Roy Jenkins |
Publisher | : |
Total Pages | : 68 |
Release | : 1963 |
Genre | : Antennas (Electronics) |
ISBN | : |
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Author | : James Roy Jenkins |
Publisher | : |
Total Pages | : 68 |
Release | : 1963 |
Genre | : Antennas (Electronics) |
ISBN | : |
Author | : Victor H. Rumsey |
Publisher | : Academic Press |
Total Pages | : 161 |
Release | : 2014-06-28 |
Genre | : Technology & Engineering |
ISBN | : 1483282228 |
Frequency Independent Antennas provides a reasonably complete coverage of frequency independent antennas from its inception until the middle of 1965. Most of the contents have not previously been published, except in scattered journal articles, and some are original. The first six chapters are written at a fairly easy level—about the level of a beginning graduate student or the more advanced undergraduate. The last two chapters, which deal with solutions of Maxwell's equations, are at a somewhat higher level. The book opens with a discussion of some fundamental ideas about antennas. It shows how typical measurements can be understood in terms of classical electromagnetic theory: in other words, how to make sense of measured data, how to set up apparatus to get meaningful data, and how to test their significance. Separate chapters follow on the features of frequency independent, plane-sheet, spiral, and log-periodic antennas. Subsequent chapters discuss how the periodic structure theory provides a way of understanding the peculiarities of frequency independent antennas; and solutions of Maxwell's equations for idealized spiral and idealized sinusoidal structures.
Author | : Victor Henry Rumsey |
Publisher | : |
Total Pages | : 19 |
Release | : 1957 |
Genre | : Antennas (Electronics) |
ISBN | : |
Author | : Thomas Tameo Sugimoto |
Publisher | : |
Total Pages | : 80 |
Release | : 1960 |
Genre | : Antennas (Electronics) |
ISBN | : |
Author | : |
Publisher | : Walter de Gruyter GmbH & Co KG |
Total Pages | : 353 |
Release | : 2020-11-23 |
Genre | : Science |
ISBN | : 3110562804 |
The book presents basic and advanced concepts of circularly polarized antennas, including design procedure and recent applications. Cross dipole antennas, microstrip antennas, helical antennas, quadrifilar helix antennas, frequency independent antennas, horn antennas, omnidirectional circularly polarized antennas and radial line arry antennas are discussed. With abundant examples, the book is an essential reference for researchers and engineers.
Author | : J. K. Shimizu |
Publisher | : |
Total Pages | : 44 |
Release | : 1959 |
Genre | : Antenna radiation patterns |
ISBN | : |
Author | : B. R. Cheo |
Publisher | : |
Total Pages | : 1 |
Release | : 1961 |
Genre | : |
ISBN | : |
A solution of Maxwell's equations is obtained for an antenna consisting of an infinite number of equally spaced wires in the form of coplanar equiangular spirals. Radiation amplitude patterns obtained from this solution agree closely with measurements on two-element spiral antennas. The phase pattern shows the approximate validity of a phase center at a distance behind the antenna which decreases with the tightness of the spiral. The current distribution clearly shows increased attenuation with increase in the tightness of the spiral thus showing how the frequency-independent mode depends on the curvature. A remarkable feature of the solution is that the current consists of an inward traveling wave at infinity when the antenna is excited in that sense which produces an outward wave at the center. (Author).