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|Posté le: Lun 3 Juil - 08:35 (2017) Sujet du message: Super MultiBand Antennas
<p>Two previous books titled “Super-Dipole” and “Super Max-Dipole” Antennas were written by this author, thereby introducing a completely new “Uniﬁed Broad-Banding Method”. This method primarily consists of the use of a 1/2 wavelength Dipole, which is fed with a 1/4 (or shorter) wavelength resonant line. The amount of coupling between these two components is greatly reduced and controlled to produce a wide SWR bandwidth. This Broad-Banding method is referred to as “Critically-Coupled Broad-Banding”.
This new book, titled “Super Multi-Band Antennas” is a continuation of the previous book, where Broad-Banding is taken to an extreme and Dual-Band antennas can be conﬁgured either on an adjacent band or those that might have a much greater 2 to 1 frequency separation.
Early chapters of this book reintroduce the “Uniﬁed Broad-Banding Method”, presenting Horizontal antennas with superb SWR bandwidths and then showing Dual-Band versions with many different band combinations from 60m on up to 450 MHz, using either wire or tubing.
Single band Folded-Dipole conﬁgurations using tubing or Ladder-line/Window-line are shown to produce extremely low SWR bandwidths.
Inverted “V” Dual-Band antennas, with many band combinations allow for easier antenna mounting.
Both Vertical and Horizontal Single-fed, Dual-Band Quad antennas have a limited bandwidth but when each individual 1/2wL section is fed, these antennas are classiﬁed as a “Prismatic Polygon” and thereby achieve far greater bandwidth, achieving it in a totally different manner from the “Critically-Coupled” method.
There are many versions of Quad, Triangular, Pentagons and Hexagon Polygon antennas and all of their Multi-radiators must be fed. Some can cover from 30 to 10m, while others can cover from 144 to 450 MHz, allowing all services within the bandwidth, including the Amateur Radio services to use these antennas.
This book presents large numbers and a variety of antennas and it also provides a path of the evolution from one type of antenna to another, providing detailed performance. Many thanks again to Eugene Belton and Dale Parﬁtt for their dedicated hard work, which without; these books would not have been possible. Surely you will be pleased with the extent of information provided, which covers important details.
publisher: Dog Ear Publishing, LLC (March 17, 2017)
isbn: 1457554763, 978-1457554766,
weight: 1.2 pounds (