Successful Wire Antennas PDF Download
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Author: Ian Poole
Publisher:
ISBN: 9781905086771
Category : Amateur radio stations
Languages : en
Pages : 240
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Book Description
Packed with the very latest wire antenna designs and developments from around the world. Covers a vast array of wire antenna designs including dipoles, doublets, verticals, loops and end-fed wires, as well a subjects such as impedance matching, TTUs, baluns, feeders, antenna masts and rigging, there is even an introductory chapter covering the antenna basics.--Cover.
Author: Ian Poole
Publisher:
ISBN: 9781905086771
Category : Amateur radio stations
Languages : en
Pages : 240
Get Book Here
Book Description
Packed with the very latest wire antenna designs and developments from around the world. Covers a vast array of wire antenna designs including dipoles, doublets, verticals, loops and end-fed wires, as well a subjects such as impedance matching, TTUs, baluns, feeders, antenna masts and rigging, there is even an introductory chapter covering the antenna basics.--Cover.
Author: John D. Heys
Publisher:
ISBN: 9780900612879
Category : Amateur radio stations
Languages : en
Pages : 100
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Book Description
Author: Edward Bearly
Publisher: CreateSpace
ISBN: 9781456543129
Category : Technology & Engineering
Languages : en
Pages : 42
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Book Description
How to Build Effective Wire Antennas was written to fill the gap between building an antenna from a pattern which includes all the dimensions and those very dry fully technical books which tell you how to design an antenna from scratch with all the details but doesn't tell you how. There is sufficient technical detail, where required, for you to be able to design your own wire antenna for any frequency you like and have it work as designed. There is practical information about materials to use with a focus on keeping costs down. These are simple designs that anyone with basic tools can build and have working in a couple of hours.
Author: Peter Dodd
Publisher:
ISBN: 9781905086436
Category : Antennas (Electronics)
Languages : en
Pages : 208
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Book Description
"Explains what makes an effective HF antenna, how to build one and how to measure its performance. The book deals with real locations, such as small gardens, apartment blocks, lofts, etc. and how to obtain optimum performance within the constraints of your location"--Publisher's description.
Author: F. M. Landstorfer
Publisher:
ISBN:
Category : Antennas (Electronics)
Languages : en
Pages : 200
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Book Description
After discussing the phenomenon of wave detachment and radiation within the nearfield of wire antennas in terms of fieldlines, instantaneous and time-average energy flow and Poynting vector ellipses, a new equivalent circuit is introduced which helps to describe and optimize short radiators. Numerical methods for shaping wire antennas for maximum performance are given. Parameters to be optimized are, for example, directivity and effective length. Numerous results for single and split-wire antennas with and without reflector, offering directivities ranging from 7 to 16 db, are presented. The results are also discussed in terms of nearfield properties. Methods for optimizing a combination of performance parameters such as directivity, sidelobe level and impedance are then presented, and results given. Arrays of these optimally shaped elements are combined in new backfire, Yagi-uda and LP antennas which offer surprising properties.
Author: C. L. Hutchinson
Publisher: American Radio Relay League (ARRL)
ISBN: 9780872597709
Category : Technology & Engineering
Languages : en
Pages : 0
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Book Description
So many wire antenna designs have proven to be first class performers! Here are two volumes devoted to wire antennas, from the simple to the complex. Includes articles on dipoles, loops, rhombics, wire beams and receive antennas--and some time-proven classics! An ideal book for Field Day planners or the next wire antenna project at your home station.
Author: Derek Scott Linden
Publisher:
ISBN:
Category : Antennas (Electronics)
Languages : en
Pages : 150
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Book Description
A Genetic Algorithm (GA) has been used in conjunction with the Numerical Electromagnetics Code, Version 2 (NEC2) to create and optimize atypical wire antenna designs with impressive characteristics. Antenna design parameters are encoded into an ordered series of numbers and/or symbols analogous to a biological chromosome. A cost function that quantifies how well a design meets the engineer's specifications is created. The GA uses these to generate and evaluate a population of designs. The most successful designs are then promoted and mixed through mating and mutation, while poor designs are removed. This process, difficult to trap in local minima, continues until convergence criteria are met, generally yielding excellent designs with no user intervention or initial guesses. Three antennas have been optimized: a monopole loaded with a modified folded dipole, the Yagi antenna, and the crooked-wire genetic antenna. Prior study of the loaded monopole had shown hemispherical coverage was possible. The GA found an asymmetric loaded monopole with an average variation in gain over the hemisphere of only 0.4dB, confirmed by measurement. GA-optimized Yagi antennas surpassed the gain of conventional Yagis by about 1dB, improvement also confirmed by measurement. The GA designed a Yagi with a beamwidth of 50 deg -60 deg, sidelobes nearly 25dB down, and a 14% bandwidth-specifications difficult to achieve using conventional techniques. The crooked-wire genetic antenna is several wires joined in series; locations and lengths are determined by the GA. Optimization for hemispherical coverage with right-hand circular polarization (RHCP) produced highly unusual shapes unrealizable using a conventional approach. RHCP hemispherical coverage was achieved with less than 4dB variation. Measurements verify the results.
Author: Joseph Carr
Publisher: Elsevier
ISBN: 0080493882
Category : Technology & Engineering
Languages : en
Pages : 264
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Book Description
Joe Carr has provided radio amateurs and short-wave listeners with the definitive design guide for sending and receiving radio signals with Antenna Toolkit 2nd edition.Together with the powerful suite of CD software, the reader will have a complete solution for constructing or using an antenna - bar the actual hardware! The software provides a simple Windows-based aid to carrying out the design calculations at the heart of successful antenna design. All the user needs to do is select the antenna type and set the frequency - a much more fun and less error prone method than using a conventional calculator to solve formulae. The new edition has been revised to include further cases of propagation, additional antennas and also two new chapters - Small Loop Antennas (a topic of considerable interest, which has been the subject of much recent debate in the amateur radio press); and Yagi Beam Antennas (widely used at HF and VHF). The CD software has also been updated.Joe Carr's expertise in the area of antenna design is legendary. Antenna designers, whether hobbyist or technician, can be assured they need look no further than Antenna Toolkit for the complete guide to understanding the practicalities of using and designing antennas today. A complete solution for antenna design in one package.Includes free CD-ROM with state of the art software for all design calculations.The definitive guide to antenna design for radio amateurs and short-wave listeners.
Author: Edward M. Noll
Publisher:
ISBN:
Category : Technology & Engineering
Languages : en
Pages : 168
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Book Description
Author: John D. Heys
Publisher:
ISBN:
Category : Amateur radio stations
Languages : en
Pages : 0
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Book Description
