Fractal antennas uses a fractal design to maximize the perimeter of the material that can receive and transmit electromagnetic radiation within a given total surface area or volume. It uses selfsimilar designs and, as a result, one gets reduced antenna size in comparison with classical antenna types for the same gain, or better gain per size, if you like and better bandwidth. Hdtv antenna gray hoverman vs fractal bowtie youtube. Fractals a fractal is a rough or fragmented geometric shape that can be subdivided in parts. About fractal antenna for ham radio bands the resource is currently listed in in 2 categories. The first application of fractals to the field of antenna theory. Im in the boonies and have a long boom on a rotator. Jun 28, 2012 while you can buy any hdtv antenna from the plentiful options available at your local electronic andor department store, you could always build your own.
I constructed a copy of dual band dk7zb 144 430 mhz yagi antenna with gain 9 to 10 dbi, max swr 1. Fractal magic diy hdtv antenna, by tigers58 fractal magic diy hdtv antenna. Antenna altitude may make all the difference a few feet or much more. The purpose of this article is to provide an overview of recent developments in the theory and design of fractal antenna arrays. I made the coat hanger antenna using romex and it works fair, 5070% signal strength. Would recommend this antenna due to the low price and very high clarity it delivers. 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. Andy shares his diy hdtv antenna project, its not all by the book as it. For uhf antenna, most of the design in the internet use around 7 inches to 9 inches. Diy tv antenna wifi antenna long range tv antenna cable tv alternatives outdoor theater homesteading tvs survival outdoor structures build the pennyloop uhf antenna it is also a very compact design lending itself well to a variety of mounting. Iteration 2 makes for 18 total triangles that make up the antenna. This antenna design grew out of my attempts to build an indoor hdtv antenna using fractal patterns after i. Fractal magic diy hdtv antenna after reading an article about the use of fractal mathematics in the design of cell phone antennas that have incredible bandwidth in spite of their extremely small size, i began to experiment with using a very simple fractal pattern, the koch snowflake, as the basis for an easy to build indoor hdtv antenna.
I havent decided if ill try wider longer bowties or taller, more bowties. Tv antennas have been around for many years and people have tried all sorts of unsightly things to fix them or make them work better anything from attaching a metal clothes hangar to aluminum foil. The new air antenna was developed in conjunction with luna technologies as part of nasas techfusion partnership. After searching the web a bit i came up with a few diy hdtv antennas. Design and analysis of new sierpinski carpet fractal antenna. Spotted in the make flickr pool, this homemade fractal antenna for digital television signals by roy jacobsen of fargo, nd.
The fractal concept can be used to achieve multiple bandwidth and increase bandwidth of each single band due to the selfsimilarity in the geometry. Judging from the comments over there, folks who have built their own fractal antennae are quite pleased with how they perform. Its not great, but im not an rf engineer so id love to hear suggestions on improvements and if i have enough motivation ill maybe even implement them. 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 such fractal antennas are also referred to as multilevel and space filling curves, but the key aspect. In this report, attention is called to this developing, but already quite large, field of study.
If you want to receive digital tv signals over the air, these four antenna builds are ideal. This fractal structure is implemented on square and several iterations are applied on initial shape. I was watching nova on fractals and they mentioned in passing about the astounding results you get with even tiny fractal antennas like have completely replaced whip antennas in cell phones and such. He also starts out using 300 ohm twin lead and states thats. Iteration 2 of the evolution from bowtie to fractal antenna.
One of the important benefits of fractal antenna is that we get more than one resonant band. This antenna has been tested to withstand strong winds for years, but it is not guarantee how strong storms can it withstand. And, i get them with the antenna located indoors a few feet away from the tv receiver, hidden away up on a window, behind the blinds and drapes. We then repeat that same process on each triangle this is the iteration method that will give rise to the fractal. Plus, i bought a preamp antenna booster, just in case.
Will a fractal antenna attached to a radio antenna give. We are seeing fractal antenna theory shedding new light on our understanding of classic wideband antennas. While you can buy any hdtv antenna from the plentiful options available at your local electronic andor department store, you could always build your own. Connect the antennas coaxial cable to the coaxial jack on the back of your tv. Fractal designs are used to fit a larger antenna in a smaller space. The main category is fractal antennas that is about ham radio fractal antennas.
So i thought i would try to a design that incorporated both eight and sixteen inch elements, with the sixteen inch elements using a third iteration koch curve to reduce the area. This antenna is recommended when fm receiver has 300. Click show more how to build a fractal hdtv antenna. How to make a fractal antenna for hdtv dtv plus more on. If you are within 3040 miles of your tv stations, then this is the antenna for you. Diy flexible fractal window hdtv antenna htpc diy via hack a day comments. Decided to keep the winegard fl5000 flatwave hdtv indoor flat antenna and looking to buy the preamped model for upstairs. One of the amazing things ive learned from years of ham radio is how many unseen and unpredictable things affect radio signals. Antenna 2, the first fractal design, had eight inch elements four inches per leg. The wikipedia page on fractal antennas might be a useful read for you. Nathan cohen professor of boston university designed, engineered and patented many practical fractal antenna solutions. However, the wavelength of the vhf is much longer than uhf.
Nathan cohen professor of boston university designed, engineered and patented many. A stacked sierpinski antenna is then designed by introducing an intermediate layer containing the triangular patch whose size is equal to that of. I made the antenna out of some paperclips, staples, cardboard and a balun i had. Aug 22, 2016 please subscribe so you can see my other videos links below on how to build your own coat hanger fractal antenna. One foreseen associated problem with the antenna design for airplanes is that a single antenna supports multiple frequencies and consumes less space hence a fractal patch antenna is designed in this thesis work that has desired multiband resonance and. So, i get 20 solid digital tv channels now with this new hd antenna. New improved hdtv fractal antenna multidimensional. Aug 12, 2015 one of the important benefits of fractal antenna is that we get more than one resonant band.
Diy fractal antenna so, first, what is a fractal antenna. Design and analysis of new geometry for microstrip patch sierpinski carpet fractal antenna is discussed. Sep 26, 2011 hdtv antenna using kock snowflake fractal in yagi layout. The antennas measured and simulated input impedances. Please subscribe so you can see my other videos links below on how to build your own coat hanger fractal antenna.
Much better than rabbit ears and attached it to the window. Hf fractal antennas offer a very compact size, a good performance and a large bandwidth, but are very unusual aerials. How to build a db4 antenna moneyrhythm tv antenna, hd. Fractal antenna for dtv overtheairheads videohelp forum. How i made an hdtv antenna so i could watch jeopardy last. Most of the doityourself diy hobbyist claims that simple and the most easy to construct tv antenna is using dipole antenna concept where the operating frequency is depend to the electrical length 7. Mar 28, 2007 among the usual antennas used in todays data transfer, there are also different type of antennas used.
Fractal antennas are the latest and the most advanced designs. Fractal reduced size magnetic loop antenna reduced size 3 times than conventional magnetic loop size 1. A fractal antenna has a few unique attributes as seen in this definition from wikipedia. How to make a fractal antenna for hdtv dtv plus more on the. This is to certify that the thesis entitled design and analysis of fractal antenna for wideband applications submitted by mr ombeni kanze kennedy, 110ec0648 in partial fulfilment of the requirements for the award of a degree of bachelor of technology in. Figure 4 shows the fabricated antenna, to ensure conjugate matching to the considered chip, the tag antenna optimization gives l 78mm, w 30mm, s 12mm, a 17mm, b mm and h 1mm. See more ideas about diy tv antenna, diy tv and digital tv. Microstrip line fed patch antenna,ieee transaction on antenna and propogation vol. Homemade tv antenna, looks good, works good duration. Hadded and david m,pozar, 1994,analysis of an aperture coupled microstrip patch antenna with i thick ground plane, antenna and propagation society international symposium, vol,2,pp. Jan 30, 2012 antenna 1 had sixteeninch elements eight inches per leg of each element.
Fractal antenna theory uses a modern fractal geometry that is a natural extension of euclidian geometry. For example, a quarter wavelength monopole can be transformed into a similarly shorter antenna by the koch. It is the best receiving dipole, because it has the greatest bandwidth. Iteration 1 of the evolution from bowtie to fractal antenna. This new antenna leverages highly complex fractal antenna technology to deliver substantially higher gain than any other film antenna on the market. Coat hanger antenna hi everybody, my first day on the forum so be gentle. Winegard fl5000 flatwave hdtv indoor flat antenna walmart. This antenna has low profile with dimensions of 80x80x1. 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.
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. Structure and analysis fractal antennas are characterized by their special geometric characteristics, which allow a reduction of the antenna dimensions 15,16. A read is counted each time someone views a publication summary such as the title, abstract, and list of authors, clicks on a figure, or views or downloads the fulltext. Fractal magic diy hdtv antenna coaxial cable ultra high.
The self similar pattern has been found to reduce loss of gain when needing to compress the size of an antenna. Fractal antennas can take on various shapes and forms. According to our investigation, the web does not offer much information on. The fractals should result in splendid new antenna designs for all. Jun 27, 2009 coat hanger antenna hi everybody, my first day on the forum so be gentle. 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 surface area or volume.
Build your own thin and powerful hd antenna lifehacker. A reconfigurable antenna is an antenna capable of modifying its frequency and radiation properties dynamically, in a controlled and reversible manner. 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. Fractal antenna theory is built, as is the case with conventional antenna theory, on classic electromagnetic theory. When i first got an hdtv i still had sd service from my satellite company and couldnt check out the hd quality. Feb 15, 2011 a truly resonant antenna for the frequency youre interested is a lot better, but not that helpful for general hdtv viewing where the frequencies range all over vhf and uhf. First publications about electrodynamic characteristics of fractal structures were published in the 1980s, but the first practical approach appeared after 10 years. A truly resonant antenna for the frequency youre interested is a lot better, but not that helpful for general hdtv viewing where the frequencies range all over vhf and uhf. According to wikipedia 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 radiation within a given total. Magloop, single magnetic loop, fractal shape magnetic loop. Fractal antenna for ham radio bands resource detail.
A fractal antenna is an antenna that uses a fractal, selfsimilar design to maximize the. This antenna design grew out of my attempts to build an indoor hdtv antenna using fractal patterns after i had watched a tv show and had read a magazine article on the use of fractal patterns in cell phone antennas, my goal was to design an antenna that not only worked well, but one that was easy to build and could be built from easiliy obtainable materials. Minkowski island fractal hdtv antenna built as shown, situated in window, picks up all hdtv signals in about a 40 mile semicircle radius. Design and analysis of fractal antennas for wideband applications. Instructions for, and discussions of, similar designs are. Once youre done, you should be able to receive the usual ota tv. One proposed method of increasing bandwidth or shrinking antenna size is via the use of fractal geometry, which gives rise to fractal antennas. The geometry of the fractal monopole for the passive tag is shown in figure 1. Design and analysis of e patch microstrip antenna for s band. Your home build projects are only as good as the lumber you. Hdtv antenna using kock snowflake fractal in yagi layout. Fractal patch antenna for aerospacenavigation authorstream.
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. Design and analysis of fractal antennas for wideband. 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. Enjoy great reception of both uhf and vhf frequencies. Fractal antenna constructions do it easy with scienceprog. Chip cohen w1yw n1ir one of the first to implement fractals in antenna modelling, patented the design and founded the fractal antenna systems company.
Diy tv antenna wifi antenna long range tv antenna cable tv alternatives outdoor theater homesteading tvs survival outdoor structures build the pennyloop uhf antenna it is also a very compact design lending itself well to a variety of mounting options and locations inside and outside. Download and print antenna template print out one copy each of part 1 and part 2 of the. A sierpinski antenna is designed by merging a grid and the fractal restoring the multiband behavior. This link is listed in our web site directory since sunday feb 12 2012, and till today fractal antenna for ham radio bands has been followed for a total of 4178 times. If you have an hdtv with a digital tv atsc tuner, you can connect the. Jun 18, 2012 diy flexible fractal window hdtv antenna htpc diy via hack a day comments. Depending on orientation and useplacement of a balun and tin foil reflector, it gets me three channels from. Oct 21, 2009 minkowski island fractal hdtv antenna built as shown, situated in window, picks up all hdtv signals in about a 40 mile semicircle radius. Being one who wants better, im wondering if anyone has made a coat hanger antenna but larger.