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Topic: Yagi antenna


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  Yagi antenna
Yagi antenna is made from the array of dipoles (elements) parallel to each other.
Yagi may be protect from weather conditions with a cylinder tube or pipe.
The Yagi-Uda antenna was invented in 1926 by Hidetsugu Yagi and Shintaro Uda in Tohoku University, Japan.
www.wifi-antenna.com /yagi   (153 words)

  
  Yagi-Uda antennas
A Yagi-Uda antenna is familiar as the commonest kind of terrestrial TV antenna to be found on the rooftops of houses.
This is because the antenna is connected via a feeder to a transmitter whose output level may be determined in terms of the voltage at its terminals.
For moderately long Yagis with several directors, the reflector spacing and size has little effect on the forward gain, providing that there IS a reflector, but being close to the driving element it has a strong effect on the front-to-back ratio and on the driving point impedance of the antenna.
www.ee.surrey.ac.uk /Personal/D.Jefferies/yagiuda.html   (2278 words)

  
 Yagi Antennas (Beam Antennas) and
directional antenna products - Yagi antennas, folded dipole Yagi antenna ...
These antennas are 2-, 4- and 8-element Yagi antennas with 3, 7, and 10 dBd gain, respectively.
The Yagi antennas are supplied with a 3 m “tail” of RG 213 terminated with an N-female connector.
The antennas are supplied with a 0.8 or 3 m “tail” of RG 213 terminated with an N-female connector.
www.procom-dk.com /antenna/a0601-yagi-antennas   (592 words)

  
 Multi Band Yagi Antenna products - Directional antenna, multi band shrouded Yagi antenna products
Below are PROCOM's directional multi band and dual band shrouded Yagi antenna models R 860-2500/10 and R 900/1800-12/14.
The Yagi antenna is supplied with circular cast alloy clamp for mounting on 25–75 mm mast tubes.
The Yagi directional antenna has 12 dBd gain on 900 MHz and 14 dBd gain on 1800 MHz.
www.procom-dk.com /antenna/a0602-yagi-antennas-multi-band   (338 words)

  
 What is Yagi antenna? - a definition from Whatis.com
The Yagi is inherently a balanced antenna, but it can be fed with coaxial cable and a device called a balunat the point where the feed line joins the driven element.
The driven element of a Yagi is the equivalent of a center-fed, half-wave dipole antenna.
The antenna propagates electromagnetic field energy in the direction running from the driven element toward the director(s), and is most sensitive to incoming electromagnetic field energy in this same direction.
whatis.techtarget.com /wforBusinessPartners/0,289931,sid9_gci214378,00.html   (393 words)

  
 YAGI ANTENNA, Yagi Cell Phone Antenna from e-mobile   (Site not responding. Last check: )
Yagi antennas should be mounted as high as possible on a tubing or pipe such as used for outdoor TV antennas.
Mount the YAGI Antenna on a 1.5 inch diameter GI pipe having a length of atleast 20 ft. The secret of better signal is always more height and therefore it is recommended to use even a 20-40 ft welded GI pipe in very weak signal areas.
Final fixing of the cell phone yagi antenna position should be done in a direction where the maximum number of bars appear or the dB level is the minimum on the cell phone.
www.cellphonesbooster.com /yagi-antenna.html   (1235 words)

  
 Yagi Antenna Design   (Site not responding. Last check: )
The completed antenna presented an SWR of less than 1.2:1 at the operating frequency, and the impedance presented to the MFJ-259 test set was in the neighborhood of 70 ohms.
Mounting the Yagi to a 1-1/4" aluminum pole is accomplished by drilling two 5/16" holes through the side of the boom at spacings which match those of the Radio Shack "U-clamp" antenna mounting bracket.
While this type of antenna still hits the shack and close-in surrounding areas directly in front of the director element with a disruptively-strong RF field, it also provides one of the strongest signals in the favored direction toward which it is aimed, of any antenna design available.
members.tripod.com /AMN92/yagi_design.htm   (1343 words)

  
 YAGI CELL PHONE ANTENNA, ANTENNE YAGI - Installation Guide
Mount the YAGI Antenna on a 1.5 inch diametre GI pipe having a length of atleast 20 ft. The secret of better signal is always more height and therefore it is recommended to use even a 20-40 ft welded GI pipe in very weak signal areas.
Final fixing of the antenna position should be done in a direction where the maximum number of bars appear or the dB level is the minimum on the cellphone.
The antenna is mounted on the proper leg of the tower with sufficient physical clearance.
www.kumaar.com /Antennas/Yagi_Installation_Guide.htm   (567 words)

  
 What is Yagi antenna? - a definition from Whatis.com
The Yagi is inherently a balanced antenna, but it can be fed with coaxial cable and a device called a balun at the point where the feed line joins the driven element.
The driven element of a Yagi is the equivalent of a center-fed, half-wave dipole antenna.
The antenna propagates electromagnetic field energy in the direction running from the driven element toward the director(s), and is most sensitive to incoming electromagnetic field energy in this same direction.
searchmobilecomputing.techtarget.com /sDefinition/0,,sid40_gci214378,00.html   (400 words)

  
 4.3 Yagi Antenna
Nevertheless, Yagi antenna differs from traveling wave antennas in principle because the current distribution need not be the superposition of a single forward wave and a single backward one.
Obviously, field on the surface of each antenna segment is influenced not only by currents and charges of the respective antenna element but too by currents and charges of other antenna elements.
In case of two different antenna elements, the mutual impedance of segments is computed a similar way; moreover the mutual distance of antenna elements has to be included to the computation of the distance between two respective segments.
www.urel.feec.vutbr.cz /~raida/multimedia_en/chapter-4/4_3A.html   (1697 words)

  
 Pringles Yagi Antenna
An antenna is an amplifier in a sense.
Many of the antennas out there use what are know as N Connectors for the jack that you plug your pigtail into, so that's what I used.
To build one, take two of the directional portions of the 18" antenna, which are the parts made from the washers, metal rod and pvc with cap, and fine a 90 degree, 125 degree, or T pvc/abs connector that attaches the ends of the tubes of the directional elements.
www.netscum.com /~clapp/wireless.html   (4344 words)

  
 A 10-element Yagi Antenna for Six
The antenna was assembled on a test pole at a height of about two metres above the ground - which was fine for assembly but not for testing, since the close proximity of the ground changed the resonance of the antenna and also the feed impedance.
the antenna elements) from being parallel to the shed to end-on.
As the antenna was rotated, and because of the temporary clamp arrangement, the support pipe appeared out to one side of the boom.
www.uksmg.org /10-element.htm   (1859 words)

  
 Antennas Direct | Yagi Antenna Selection
The Yagi antenna is credited to Hidetsugu Yagi, a Japanese physicist who pioneered the field of directive antennas.
To increase the frequency bandwidth of Yagi style antennas, we increase the diameter of the antenna conductors.
Indoor antenna for use in strong signal areas or locations where multi-path distortion is an issue.
www.antennasdirect.com /yagi_antenna.html   (221 words)

  
 YAGI ANTENNA DESIGN BASICS - Learn More About a Yagi (Beam) antenna!
The amount of gain is directly proportional to the length of the antenna array and not by the number of directors used.
In most antenna designs, the feedline impedance will be 50 ohms, but usually the feedpoint impedance of the yagi is rarely 50 ohms.
The amount of variation from the antenna's design specification goals that can be tolerated is subjective, and limits put into the design are mainly a matter of choice of the designer.
www.hamuniverse.com /yagibasics.html   (1130 words)

  
 Antenna types, Yagi antenna, Yagi-Uda antenna
Yagi antenna A Yagi-Uda Antenna, commonly known simply as a Yagi antenna or Yagi, is an antenna consisting of an array of a dipole and additional parasitic elements,...
Yagi antenna Yagi antenna, The Yagi-Uder array is named after its inventors (in practice it's usually just called a “Yagi”).
Yagi-Uda antenna a Yagi-Uda antenna is familiar as the commonest kind of terrestrial TV antenna to be found on the rooftops of houses
www.educypedia.be /electronics/antennayagi.htm   (380 words)

  
 Yagi Antennas : Antennas: Yagi
Antenna insulators for DK7ZB Yagis - Homebrew antenna insulators for DK7ZB yagi antennas
QM5 Yagi for 2 meters band - The QM5 antenna is a simple 5 elements Yagi with 1.88 m boom length for the lower 144 MHz SSB/MGM band, I used it mainly for Sporadic-E and MS contacts.
QM7 7 elements 144 MHz Yagi-Uda Antenna - The QM7 antenna is a simple 7 elements Yagi with 3.70 m boom length for the lower 144 MHz SSB/MGM band, I used it mainly for Sporadic-E and MS contacts.
www.dxzone.com /catalog/Antennas/Yagi   (1285 words)

  
 Yagi Directional Antennas
Note: the rooftop TV antennas seen all over the US are a cousin of the Yagi design but are called Log-Periodic because they are quite different in serving a huge number or width of frequencies.
The antenna is designed to manage the power in the wanted direction and thus reduce it in unwanted directions.
Don't install the antenna where the signal has to cross where people will be walking in front of or touch your antenna.
www.alternativewireless.com /cellular-antennas/yagi.html   (954 words)

  
 Yagi Antenna -- from Eric Weisstein's World of Physics
Yagi, a Japanese physicist who translated into English an antenna design based on a parallel array of dipole antennas.
(However, it is said that the actual design of the antenna was invented by a professor Uda.) The design involves placing a slightly longer dipole behind, and a slightly shorter dipole in front of, the driven dipole to direct the radiation in the direction of the longer-to-shorter elements.
Today, Yagi antennas usually have several of the shorter ("director") elements and one of the longer ("reflector") elements separated by a small fraction of the wavelength of the driven element (about 1/10).
scienceworld.wolfram.com /physics/YagiAntenna.html   (141 words)

  
 Wi-Fi Pringles Can Yagi Antenna
While a directional antenna showing between 12 and 15db gain is impressive, it's also pretty large, physically.
Yagis and dishes are much more directional than sectors and omnis.
When trying to aim a yagi (like our little can), keep in mind that they have large side lobes that extend up to 45 degrees from the center of the can.
www.3nw.com /pda/wireless/wi_fi_pringles_can_yagi_antenna.htm   (1486 words)

  
 The Optimized Wideband Array Yagi
In a monopole antenna, the increased radiation resistance is extremely useful in matching the antenna to a feedline.
Because the OWA yagi uses a direct dipole feed, the driven element must be split in the center as well as insulated from the boom.
The antenna was re-optimized in the stack in order regain the excellent F/B but the VSWR had to be sacrificed in order to meet this goal although it is still under 1.6 across the band.
www.naic.edu /~angel/kp4ao/ham/owa.html   (1625 words)

  
 The Ultimate Guide to 11 Meter CB Antennas
The middle element is an antenna you are already familiar with, the simple 1/2 wave dipole antenna.
The gamma match is a type of matching transformer used to match the feedpoint impedance of the antenna (which rarely is 50 Ohm) to the 50 Ohm coax.
This antenna is fed with two separate coax that can be switched at any time, to switch between horizontal and vertical polarization.
www.signalengineering.com /ultimate/yagi.html   (1620 words)

  
 FM Stereo Yagi Antenna
The antenna rejects most signals from all other directions but the direction it is pointing while increasing the reception in that direction by as much as 9db.
This antenna can be fairly compared to some of the most popular antennas among FM DXers and in some cases could surpass their reception.
The antenna is very simple to install because it is very, very light and it comes ready to be put together.
www.fmdxantenna.com /fm8.htm   (629 words)

  
 Yagi Modeler Applet/Application
Since only a single yagi is modeled, the current in each element is symmetrical about the center of the element.
The rear lobe of the scaled yagi is not as small as the designed at frequency one, but it isn't really bad either.
Considering that I scaled the original yagi by a factor of 3 in frequency the results are pretty good.
fermi.la.asu.edu /w9cf/yagipub/index.html   (1581 words)

  
 13 element Yagi Antenna for 2
The reflector is simply a rectangular piece of sheet aluminium 5cm x 8cm, supported from the rear with a triangular support which in turn is bolted to the boom.
Modelling a yagi with nec-2 shows that the design is fairly tolerant of errors to the position and length of the directors providing that each director is larger than the one in front.
I predicted that the antenna would probably perform better on the lower channels because the balun was a little long.
www.users.bigpond.com /darren.fulton/yagi/13_element_yagi_antenna_for_2.htm   (1639 words)

  
 The Ultimate Guide to 11 Meter CB Antennas
The study of Yagi antennas on the computer has produced some outstanding new Yagi designs and shed some light on the key dimensions of Yagi performance.
The initial design was based on a 4 element Yagi for 24Mhz (12 Meter Ham Band) from the 19th edition of the ARRL Antenna Book (which also contains great detail on the physical construction of Yagi antennas).
With some adjustment of the boom length, element spacing and element length this antenna is transformed into a very potent performer, due to its new found ability to "reject" signals from unwanted directions better.
www.signalengineering.com /ultimate/4_element_yagi.html   (2222 words)

  
 Dipole/Yagi Antenna   (Site not responding. Last check: )
To tune the antenna, each dipole must be trimmed separately by cutting small equal length pieces from each end until a low SWR (below 1.5 to 1) is achieved for the low end of the band.
The two element yagi style antenna I am most comfortable with is one that employs a reflector instead of a director element.
The antenna modeling was done with all the wires in the yard included in the model to get the whole story of how well this antenna should do for me. First on 20 meters...
home.teleport.com /~nb6z/yagi.htm   (1027 words)

  
 DirectionalYagi - Seattle Wireless
It's 15dbi, and I estimate for $10, some scrap parts, and a bit of time you too can have a 15dbi yagi.
The W9CF computed impedance (Zin) at the driving element is not corrected for the folded dipole driver and should be multiplied by 4 to estimate the final impedance.
The reflector is about the size of a soup can with an N Female flushmount and some extra copper or brass piping.
www.seattlewireless.net /index.cgi/DirectionalYagi   (260 words)

  
 iB::Topic::2M 7 element yagi antenna
I purchased a pair of these last year and gave one to a friend of mine 40 miles away so we could talk to each other on a point to point basis with a minimum of power.
This antenna has worked great and allowed us to do so with as little as 5 watts depending on weather conditions.
This antenna however, uses element clamps with screws which make it a breeze to assemble or disassemble.
www.qrz.com /ib-bin/ikonboard.cgi?s=5f2097385d1970a22835d5d65d8ba536;act=NW;f=1;t=116489   (379 words)

  
 Beam Seven Element Yagi Antenna
To optimize the antenna for a frequency RANGE, do the calculations twice, once for the low end of the range and once for the high end; then average the two and plan to adjust the VSWR on both ends of the range as needed.
As general information, the director is the shortest element, the driven elements are the middle elements (in a 7 element beam, each the same size) and the reflector is the longest element.
Spacing is on the antenna bar holding the elements, with equidistant spacing from each of the outside elements to the driven element.
www.hamradio.cc /antennas/antenna_beam_seven_element_yagi.php   (180 words)

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