It is important to remember that even the best antenna coupler cannot perform well without a good antenna. Most of the big boys around my qth were regularly working a repeater which is located roughly 70 miles away. It is the job of the antenna to radiate the electrical energy from your transmitter as electromagnetic radio wave. Indeed, although many folks like to bandy the gain advantage of a collinear. An antenna or aerial is an electrical device which converts electric power into radio. Yagi in the 1920s did not receive full acclaim in the united states until 1928. A solutions manual is available only for the instructors that adopt the book as. Other very good j antenna designs published in 73 magazine have been. Here you can download the free lecture notes of antenna and wave propagation notes pdf awp notes pdf materials with multiple file links to download. A commonly used antenna is the half wave di pole antenna. What is the best book for antennas and wave propagation. An intuitive tutorial of antennas and antenna theory. This link is listed in our web site directory since tuesday nov 2007, and till today marine corps antenna handbook has been followed for a total of 4597 times.
Antenna theory is based on anlternating polarization of the emmiter and the receiver antennas, in order to produce an electromagnetic wave in space. A j pole antenna k4krw collinear j pole bob k9tmus slim jim variation on j pole dual band easily built from a piece of 450 ohm ladder line. Essentially, a j pole is a 12 wave resonant antenna connected to a quarter wave matching stub. It does not need a ground plane, radials or a complicated matching system. Antenna and wave propagation awp notes pdf 2020 sw.
When the feed point is moved to the shortcircuited end of the slot or inf antenna, the impedance decreases. The j pole is one antenna that probably should not have a balun for the above reason, should you decide to try this poorly conceived antenna. Collin, small antenna handbook, wiley, 2011, isbn 0470890835 modern antenna handbook, c. J pole theory pop the j pole antenna is an omnidirectional antenna that can be used for base, mobile and field day stations. Gain versus the number of elements of the yagi array arrl antenna book number of. Pdf ham radio applications demand antenna design with an aim of achieving maximum gain, which is affected by several factors. The jpole antenna, more properly known as the j antenna, was first invented by hans. The resource is currently listed in in 2 categories. Jan 20, 2021 tame the predictable mast currents found in any jpole antenna grounding conductive mast using a simple stub. This book was set in times by mps limited and printed and bound by.
Jan 20, 2006 while providing a thorough foundation in theory, the authors of this publication provide a wealth of handson instruction for practical analysis and design of conformal antenna arrays. Zepp antenna theory windom antenna theory 4080 meter inverted v dipole antenna antennas for difficult situations g7fek limited space antenna nested marconi antenna doublet aerial for hf amateur ham radio short wave bands some general talk about design and builds, worth watching, useful info. Thus, you get the knowledge you need, alongside the practical knowhow to design antennas that are integrated into such structures aircrafts or skyscrapers. Principlesofradiotransmissionandrecep tionwithantennaandcoilaerials by j. Since the antenna needed to be vertically polarized, i hit upon the notion of a j pole. The author discusses electromagnetic radiation and antenna characteristics such as impedance, radiation pattern, polarization, gain and efficiency. Shown is empirical evidence why this is a problem and a very simple solution all future grounded j pole antennas should incorporate. Pdf in this paper a super jpole antenna with two modified fractal koch curve shaped elements is proposed. A practical approach to hf and vhf antennas, plus antenna. There are several antenna books like the arrl antenna book for radio communications practical microstrip and printed antenna design by anil pandey, artech house, 2019 microstrip antenna design handbook by r garg, prakash bhartia, ph. In order to increase the bandwidth and to provide proper phasing of the currents in the. The j pole can be cheaply, simply and quickly constructed using a variety of techniques, some of which are discussed in this article.
In dealing with both antenna theory and radio wave propagation, a th. From the book, the slim jim was developed based on the basic j pole design, see fig. The j pole antenna became so popular in the vhf band because of its simplicity in design and construction. The opinions expressed in this book are those of the author and not necessarily those of the rsgb. Invented by fred judd g2bcx, the name was derived from its slim construction and the j type matching stub j integrated matching the slim jim variation of the jpole antenna has. Pattern 32 appendixinstallation and operation of antennas and equipment 35 1. The main category is basic antenna theory that is about antenna theory, basics,design antenna. About marine corps antenna handbook the resource is currently listed in in 2 categories. Antenna theory and design, 3rd edition engenharia eletrica ufpr. In this paper the analysis of the j pole antenna and two of its configurations namely super j pole and collinear j pole antennas are presented. An inefficient antenna produces a smallamplitude em wave for the same feed power, and converts most of the power into heat.
The antenna consists of separate halfwave dipoles for 40, 20, 17 and 10m as shown in fig 4. Unnecessarily complicated math is avoided throughout. Mar 15, 2011 basic antenna theory and application a major qualifying project report. The antenna has an omnidirectional pattern with a low takeoff. Greenblums optimisation for multielement yagis fig 16. Jan 12, 2008 allowed to flow on the outside of the coax shield and reduce the j pole s performance. The book provides a lucid overview of electromagnetic theory and a com prehensive.
This type of antenna, even though the radiating portion is 12 wavelength and by itself would be selfresonant making it a hertz antenna, it has an additional 14 wave added. The j pole antenna, more properly known as the j antenna, was first invented by hans. The dbj1 is easy to construct using inexpensive materials from your local hardware store. Elliott, john wiley and sons ieee press series on electromagnetic wave theory, 2003. Analog and digital communication systems by martin s.
The original idea comes from the zepp antenna which was developed for use on the german led. It is in a condensed form and the antenna theory is explained so most hams can understand it. An efficient resonant antenna 14 wavelength or longer produces a largeamplitude em wave for a given feed power, and produces little heat. The marsians mass produced this antenna during the vhf frenzy in the mid80s. Clerks in radio stores told me that this book was outselling other titles 2. On most of the j pole designs out there, a choke should be used as close to the feedpoint of the antenna as possible to help prevent rf on the feedline and creating difficulty with swr readings.
This type of antenna, even though the radiating portion is 12 wavelength and by itself would be selfresonant making it a hertz antenna. This form of antenna originated as a practical solution to feeding a wire antenna trailing behind a dirigible. Matching to the feedline is achieved by sliding the connection of the feedline back and forth along the stub until an impedance match is obtained. These are preliminary notes, intended only for distribution among the participants.
Length of director position in the array for various element diameters arrl antenna book fig 16. The j pole antenna consists of a halfwavelength radiator fed by a quarterwave matching stub. Department of commerce rebecca blank, acting secretary. Copper dualband super j pole antenna by ka0nan, april 1993. Silver n0ax editor, american radio relay league, 2011, isbn 087259694x.
This book offers an indepth coverage of fundamental antenna theory, and shows how to apply this in practice. Pdf modified fractal super jpole antenna researchgate. It was with surprise and delight that i noted that clerks in one radio store could cite the mcgrawhill catalog number from memory, when they could not do that for other antenna books. Antenna theory analysis and design, 3rd edition by balanis. They confirmed that the types of people who buy the book meet the profile above. The result is essentially an endfed dipole which exhibits more gain and a lower take off angle than the traditional halfwave dipole. While the information presented is believed to be correct, the author. It is the job of the smartuner to match the antenna to the transmitter. Measurements and simulation confirm the quarterwave stub modifies the circular hplane pattern shape increasing the gain slightly on the side of the j stub element and reducing the gain slightly on the side opposite the j stub element. This website is designed to present a comprehensive overview of antennas, from design, to measurement and theory. Antenna engineering handbook johnson antenna theory balanis. Antenna theory and applications book oreilly media. To introduce the fundamental principles of antenna theory and various types of antennas. Antenna theory and applications wiley online books.
Pdf in this paper a super j pole antenna with two modified fractal koch curve shaped elements is proposed. In the first set of plans, the feed point is approximately 20% up from the shorted end of the matching stub. Ed fonged fong wb6iqn gives vaca valley radio club a presentation via skype. Primarily a dipole, the jpole antenna exhibits a mostly circular pattern in the h plane with an average freespace gain near 2. The material in this ebook also appears in the print version of this title. Pdf antenna theory analysis and design, 3rd edition by.
The slot antenna can be considered as a loaded version of the inf antenna. Antenna and wave propagation pdf notes book starts with the topics covering antenna basics, thin linear wire antennas, antenna arrays. Pdf comparative analysis of slim jim antenna for ham radio. A copper cactus is fun to build, but a ground plane will usually out perform it. In addition, the book provides readers with the necessary tools for analyzing complex. This book is about common medium wave and high frequency short wave antennas, but the theory presented here relates to antennas of any frequency. Driven element is excited directly via feedline, all other elements excited parasitically. The j pole antenna is an omnidirectional, halfwave antenna fed via a quarterwave matching stub. Realizing many hams are mathematically challenged, only simple mathematics procedures are used. Ictpituursi school on wireless networking for development the abdus salam international centre for theoretical physics. The dualband twinlead j polc antenna is made from standard flat 300 ohm twin lead tv antenna wire.
There are updated free pdf versions of the book available subject to. For 2 meters, the coil is 4 turns of coax at 5 inches in diameter. Being a halfwave antenna, it provides a small gain over a. Principles of radio transmission and reception with. Applying the principles of antennas to the analysis, design, and measurements of antennas.
A variation of the j pole is the slim jim antenna, also known as 2bcx slim jim, that is related to the j pole the way a folded dipole is related to a dipole. Understanding antennas for the nontechnical ham by n4ja an. Antenna theory and design find, read and cite all the research you need on researchgate. Most antennas reversibly link radiation fields to currents flowing in wires at frequencies. Having recently expanded my amateur radio collection to include 6meters, i found myself needing something more than the wire dipole antenna i originally installed. Generally people dont think of radiofrequency radiation in terms of discrete. A2 dipole adjustment required to change resonant frequency 43 fig. Carr mcgrawhill new york chicago san francisco lisbon london madrid mexico city milan new delhi san juan seoul. In antennas we do exactly that, applying a voltage on a wire without grounding the other end. Jan 30, 2012 this book offers an indepth coverage of fundamental antenna theory, and shows how to apply this in practice. Don murray w9ve building a dualband antenna mentorfest 102304 16 an even better j pole electrically the gain is about 7.
In the midfifties, and early sixties, ridged copper was difficult to find, and even if we were fortunate enough to locate ridged copper, the cost was prohibitive. This website is intended to be a source of knowledge for learning about and understanding antennas. Conformal array antenna theory and design wiley online books. If a jpole antenna is good for 2m, would it be 3x as good. First, the radiator is made from antenna wire, not the 450ohm ladder line, as in the 2m j pole. Submitted to the faculty of the worcester polytechnic institute in partial fulfillment of the requirements for the degree of bachelor of science by. In this paper the analysis of the jpole antenna and two of its configurations namely super jpole and collinear jpole antennas are presented. Aug 07, 2008 this antenna differs from the 2m j pole in a couple of ways. The jpole antenna is an endfed omnidirectional halfwave antenna that is matched to the feedline by a quarter wave parallel transmission line stub. Antenna models for electromagnetic compatibility analyses. Practical antenna handbook fourth edition joseph j. Element lengthsdiameters and element spacing determine antenna behavior.
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