160 meter fractal antenna pdf

It is difficult to get a horizontal antenna dipole high enough to be an effective antenna on 160. Two or three close spaced 500 to 600 foot beverages, staggered 125 feet 12 db. Aug 26, 2016 that said, one example of a simple fractal antenna is the logperiodic, whose elements are scaled from back to front in a manner that allows continuous transmit and receive coverage for a wide slice of spectrum, for example from 7. Simple and effective 160m antennas at ua9ba lazy sloper. May 10, 2015 this is my 6 foot diameter magloop for 80 and 160 meters. Erecting effective 160m antenna on a small lot is a challenge. Coaxial inverted l for 160 meters by john n9lye few amateurs have room for full sized vertical antennas on 160 meters. Multiband vertical antenna 160 through 10 meters saft.

Classic ocf antennas, like these, are typically fed with a 23 and offcenter ratio. Buckmaster ocf offcenter fed dipole antennas are a very simple way to get on the air and work multiple bands quickly. The term random infers that you can use any length of wire you want as an antenna, while that basic fact is true, there are some practical considerations. Antenna was calculated with help of program vk4anw. The antenna has diameter 110 mm and is 2 meter in length. The size is somewhat formidable, but the carolina windom 160 is a single antenna that does it au from local 1601 75 round tables to 10 meter dx. Fractal geometry may also involve successive branching of antenna elements according to some fixed ratio. High performance 160 meter transmitting antennas the 125 foot vertical. Jeri ellsworth, selftaught engineer, talks about her career duration. A fractal antenna is an antenna that uses a fractal, selfsimilar design to maximize the length, or increase the perimeter on inside sections or the outer structure, of material that can receive or transmit electromagnetic signals within a given total. Any thoughts or designs on a practical fractal antenna for hf work.

A 160 meter antenna for the acreagechallenged ham jim streible, k4dli those of us who live on a city or subdivision lot know how dif. Quadratic providing a swr null near or within every amateur band from 160m to 6m. Tuner palstar 1500cv roller inductor solved the problem. A 3element 160 meter vertical array rudy severns, n6lf. Theoretically as much as 20kv peak voltage can be found at the antenna feedpoint on 160 meters with full legal limit and no ground losses. As with all trap dipoles, this one has lessthanideal bandwidth due to the load ing effect of the traps. The sizes are without protected enclosure indoor variant. Parnell, use your tower as a dual band, low band dx antenna.

A reducedsize half sloper for 160 meters heres a limitedspace antenna that will put you on the top band. While you probably wouldnt try to construct a fullsize quarterwave 160 meter vertical for a dxpedition, the computed results are very similar no matter what band you use with a beachfront vertical. Pdf abstract a novel fractal antenna on the planner design is presented in this. The objective of this article is to disseminate some practical information about. Just stick a small or fake tv antenna on the 40 foot pushup or even a small 2 meter beam. The computer simulations showed that the 80 meter antenna would have a radiation resistance of only 10 15. Easy to build low band receiving antennas for small and. For many years, i used a simple wire inverted l and a tuner to get on top band, just like many others before me. The pef 160 10 contains a ft24061 trifilar wound, 9. Explore fractal antennas with free download of seminar report and ppt in pdf and doc format. I checked in to a local 160 meter net and 4 out of 5 stations.

A fast taper multiband vertical antenna system with the patented safttilt base us patent nos. Vertical t antennas at the search of the best tx antenna for a lowlatitude location by pierluigi luis mansutti iv3prk after having learnt which are the effects of the earths magnetic field on 160 m. An overview of the underestimated magnetic loop hf antenna. Not everyone can install a quarterwave vertical with 120 or. K6mm 160 meter vertical a restricted space helical vertical. Wintertime is the perfect time for exploring the top band. However, the manual only provides antenna parameters for some radio services. Nevertheless, the love of experimenting with antennas played a critical part in the successful. Mandelbrot 20 november 1924 14 october 2010 a polishborn, french and american mathematician, noted for developing a theory of roughness in.

Fractal antennas seminar report, ppt, pdf for ece students. Fractals a fractal is a rough or fragmented geometric shape that can be subdivided in parts. It seems one of the best kept secrets in the amateur radio community is how well a small diminutive magnetic loop antenna can really perform in practice compared with large traditional hf antennas. But if a totallength limitation imposed by property boundaries or the spacing of avail.

The best results work when you have an antenna with a large vertical component. Build this fun antenna and get on the topband train. It is observed through measurements that the wearable antenna reaches a gain of larger than 0 db and an efficiency of 48 %, with a size of less than 0. The antenna this 10 160 meter tuned horizontal loop antenna is fed with 450 ohm ladder line all the way into the ham shack to an palstar at1500bal balanced line antenna tuner.

Fractal antenna elements and arrays here is an excellent introduction to a new technique for antennas with both wide bandwidth and reduced size x. A method used to bring 450 ohm feed line into the shack. Fractal antennas can take on various shapes and forms. If w1, wm are selfaffine construction on rn, so it is a unique. You will achieve the strongest possible presence at your power level and be competitive with a 160 meter vertical monoband antenna that is only 55 feet tall. In 15, hwang proposed a modified sierpinski fractal antenna to reduce.

A fractal antenna is an antenna that uses a fractal, selfsimilar design to maximize the effective length, or increase the perimeter on inside sections or the outer structure, of material that can receive or transmit electromagnetic radiation within a given total surface area or volume. Acenterfeddipoleandcanbeconstructedasamulfband antenna. This antenna is designed for stations having a difficult time putting a. Band antenna into a 60 meter monoband antenna dxembve5 or 5a remote tuner upgrade models available if you are upgrading from an existing dxembve5 or 5a system with the original short base tube to a mbve5a with a mfj993brt, mfj994brt or mfj998rt remote tuner, the following upgrade kit options are available.

So, i decided to give it a try after all these years. He established a field strength reference point at 100 w to the antenna using. Multiband vertical antenna 160 through 10 meters safttilt base. Representative arns directional transmitting antenna. High performance receiving antennas 10 to 14 db rdf 10 db.

A custom designed capacity hat system allows this vertical monoband antenna to get on 160 meters. Pdf design and fabrication of a flexible minkowski fractal antenna. A five element parasitic rotatable vertical yagi for 160. Below are the details of my antenna which is a new twist on a well established antenna. Fractal antenna theory uses a modern fractal geometry that is a natural extension of euclidian geometry. This antenna covers 65 khz of 160 meters, 75 khz of 80 meters and the entire 40 meter band with swrs under 2. Ham radio fractal antennas category is a curation of 11 web resources on, w1yw fractal antennas, fractal quad for 28 mhz band, fractal antenna for ham radio bands. The 160 meter band vertical antenna is tunable with an impressive 40 khz bandwidth. Dec 03, 2018 build a 160 80 meter magnetic loop antenna part 1 duration. Also explore the seminar topics paper on fractal antennas with abstract or synopsis, documentation on advantages and disadvantages, base paper presentation slides for ieee final year electronics and telecommunication engineering or ece students for the year 2015 2016.

June 1991 helped me understand what essential considerations i had to take into account. Low ohmic resistance due to the small physical size combined with system impedance transformation and capacitive input coupling provide radiation resistance corresponding to an efficiency of about 85 percent. One proposed method of increasing bandwidth or shrinking antenna size is via the use of fractal geometry, which gives rise to fractal antennas. A long or so folded dipole isnt a 160m antenna, its an 80m antenna. Hence, half wavelength dipole antenna using fractal koch curve technique was designed in order to miniaturize the antenna height with a given total surface area or volume.

The winner of the qst cover plaque award for july is john miller, k6mm, for his article a no excuses 160 meter vertical antenna. Given the length of a 160 meter 14 wavelength vertical, this strongly suggested that the vertical be made from an aluminum tower. I did state that my requirement for a 160 meter antenna would rule out the use of a fractal. Spiderbeam 160m vertical model 160 184wth 5 160 184wth manual, ver. Buckmaster ocf dipole antennas dxocf160 free shipping on. The antenna system bear in mind that the antenna is only part of a coherent system. The vertical antenna operates from 160 meters through 10 meters using a good quality outboard. Susman apti, inc w ith the advance of wireless communication systems and increasing importance of other wireless applications, wideband and low profile. This is the price paid for multiband coverage and physical short ening.

In the evening when most of us have time to relax and enjoy a little time on the radio, the higher frequency bands are either dead or very crowded. Jan 02, 2011 fractal geometry means using a clover leaf or snow drop pattern rather than a loop or a square. An introduction to operating on 160m carl luetzelschwab. This is my 6 foot diameter magloop for 80 and 160 meters. Even fewer have room for a dipole up at least half a wavelength above ground. This will vary based on the construction of your 43foot vertical, its proximity to other objects, etc. It might just kill the tower biz if a practical hf fractal design can be worked up. A dipole works best at and above its fundamentalresonant frequency. The base of the vertical was 14 m away from the water, so some radials rested in the water. Generally, the fractal antenna technology is a term used to describe these antenna. However the antenna reactance will almost certainly be in the 550650 ohm range, requiring 50uhy of inductance for antenna matching. Download and print antenna template print out one copy each of part 1 and part 2 of the.

My homemade amateur radio antenna for the 160 meter band is the result of many considerations, inner debates and tests. I had 5 beverage antennas ranging from 8001,200 feet. Fractal geometry means using a clover leaf or snow drop pattern rather than a loop or a square. Printed circuit fractal loops the printed circuit fractal loop antenna is designed to achieve u ltra wideband or multiple wideba nd performance and significantly reduce the antenna dimensions. Pdf design of fractal antenna for gsm phone applications. And the counterpoise wires are invisible, for that matter. Antenna designers are always looking to come up with new ideas to push the envelope for antennas, using a smaller volume while striving for every higher bandwidth and antenna gain. The fractal antenna not only has a large effective length, but the contours of its shape can generate a capacitance or inductance that can help to match the antenna to the circuit.

The goal of this work is to observe how fractal antennas might exhibit. The above graphic depicts the overall layout of the loop antenna consisting of 558 ft. With this atu the antenna worked stable on the 160 meter with swr at transceivers swr meter 1. With the ll dipole, you dont complete the loop, you leave a gap in the center of the twin lead or ladder line directly opposite the feedpoint. Both the antenna and the raising fixture are made from aluminum tower sections. K4sx cage invertedl antenna for 160 meters smeter ham. For example, a quarter wavelength monopole can be transformed into a similarly shorter antenna by the koch. I found that the antenna had diagram directivity that differs from the old one. A magnetic loop antenna mla can very conveniently be accommodated on a table top, hidden in an attic roof loft, an outdoor porch, patio balcony of a highrise apartment, rooftop, or any other tight space constrained location. Build a space efficient dipole antenna for 40, 80 and 160 meters. Here is the pattern of the 160 80 meter antenna on 3. The standard dipole, koch curve dipole antenna with one iteration and 2 iteration was. In theory you could make a 80 meter antenna very small, tiny even, compared to most 80 meter antennas used today. Further, very high rf voltages occur at the antenna feedpoint due to the high reactance of the 43foot antenna on 160 meters, and to a lesser extent on 80 meters.

Antenna engineering handbook ntia us department of commerce. Hf fractal antennas offer a very compact size, a good performance and a large bandwidth, but are very unusual aerials. I designed and constructed the antenna on november 11, 2007. The real benefit of fractal antenna designs is the broadband qualities rather then any magical extra gain in. Isbell and raymond duhamel individual componentsdipoles length and spacing of elements of lpa increase logarithmically from 1 end to the other z and r characteristics that are regularly repetitive as a logarithmic function of the excitation frequency multielement. As you can see, it may even be easier to hide a 160 meter inverted l than a 40 or 80 meter inverted v. This means that operation on the cw dx frequencies and dx phone frequencies is within range of most radio internal tuners no antenna changes are necessary. The massive 38 thick rugged aluminum base allows easy, safe tilt action without unsafe removal of mounting hardware. Feb 04, 2015 chip cohen w1yw n1ir one of the first to implement fractals in antenna modelling, patented the design and founded the fractal antenna systems company. Feb 15, 2015 in 9 out of 10 cases an electrically short antenna will perform much worse than a full size one and its not like youre gaining and amazing height advantage by having it on the roof. Fractals in antennas and metamaterials applications intechopen.

When i had my ranch in wyoming, i had a great system for 160 meters. However the antenna was unstable for match on the 160 meter. According to our investigation, the web does not offer much information on. Nov 25, 2007 i have heard for many years of the great challenge of putting up a dx antenna for 160 then actually getting it to work. Multiband plasmonic sierpinski carpet fractal antennas arxiv. In this report, attention is called to this developing, but already quite large, field of study. The real benefit of fractal antenna designs is the broadband qualities rather then any magical extra gain in a small package. The matchbox handles 500 to watts of power pep into a matched load. Portable endfed 16010 meters dipole antenna ni4l antennas. I had a wave inverted l going up a 75 foot tower with a 120 radials below it. A small but efficacious hf antenna for restricted space sites is the highly sort after holy grail of.

I think what youre referring to is a linear loaded dipole, which is different. The random wire antenna is probably one of the least expensive, easiest and cheapest hf antennas to use if you have a tuner and you want to get the most out of a length of random wire without having to pull out that calculator, doing the math, getting the center insulator built or bought, running the feedline, and all the rest that goes with putting up a more elaborate antenna. Magnetic loop antenna current and voltage distribution youtube. Antennas and working 160 meters milford amateur radio club. I did respond twice to other peoples mention of a 160 meter fractal antenna. I create a two turn outer loop to get down to 160 and it works very well. In the brief study of fractal antennas for this report, i have found hundreds of papers, dozens of patents. A fractal antenna has a few unique attributes as seen in this definition from wikipedia. A compact wideband fractalbased planar antenna with. Dx engineering 160 meter thunderbolt vertical antennas. With 29 zones, i almost got to my dxcc before moving back to denver. Dx engineering 160 meter thunderbolt vertical antennas are highperformance antennas specifically designed for use on top band. We are seeing fractal antenna theory shedding new light on our understanding of classic wideband antennas.

Resources listed under fractal antenna category belongs to antennas main collection, and. Deterministic fractal antennas are employed to realize multimodal. The transmission line carrying the rf energy between the antenna and the transceiver. In 9 out of 10 cases an electrically short antenna will perform much worse than a full size one and its not like youre gaining and amazing height advantage by having it on the roof. In his scheme the 4square was transformed into two reversible 3element arrays at right angles to each other.

However, there are several easy things you can do with your present antenna to initially get on the best amateur radio band 160. A physically short broadbandwidth multiband vertical antenna with 50 ohm input impedance and 25 foot square footprint for 160, 80, 40 and 17 meter radio bands. The lowest frequency at which a dipole is resonant is known as its fundamental resonance. It took several attempts including a top loaded vertical of 28 mh with 20 ground radials each 40m long and laid within the property limits. Use your tower as a dual band dx antenna for 7580 and.