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Topic: Antenna

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In the News (Fri 27 Apr 18)

  Antenna - Partstrain.com
It is physically an array of conductors intended to transmit an electromagnetic field as a response to an applied alternating voltage as well as the alternating electric current associated with it.
On the other hand, antennas can also be situated into an electromagnetic field in order for the field to bring on an alternating current in the antenna and a voltage right between its terminals.
The length of the antenna, as well as the materials from which they are made of really bring a big difference in the quality of reception that the car stereo receives.
www.partstrain.com /ShopByDepartment/Antenna   (464 words)

  Antenna (radio) - Wikipedia, the free encyclopedia
Complex impedance of an antenna is related to the electrical length of the antenna at the wavelength in use.
The (large) loop antenna is similar to a dipole, except that the ends of the dipole are connected to form a circle, triangle (delta loop antenna) or square.
The Phased array antenna is a group of independently fed active elements in which the relative phases of the respective signals feeding the elements are varied in such a way that the effective radiation pattern of the array is reinforced in a desired direction and suppressed in undesired directions.
en.wikipedia.org /wiki/Antenna_(electronics)   (3233 words)

 Antenna - Wikipedia, the free encyclopedia
In biology, antenna (plural: antennae) refers to the sensing organs of several arthropods.
Antenna, also known as ANT1, is a Greek-language terrestrial channel.
In astronomy, antenna may be a reference to a radio telescope.
en.wikipedia.org /wiki/Antenna   (155 words)

 antenna on Encyclopedia.com
ANTENNA [antenna], in electronics, system of wires or other conductors used to transmit or receive radio or other electromagnetic waves (see radio); sometimes called an aerial.
Distribution of the waves depends on the design of the antenna; the transmitting antennas of a radio station might be designed to emit waves in all directions, while an antenna used for radar or space communications would be designed to focus the waves in a single direction.
The antenna has a characteristic frequency related to its physical dimensions; a wire of a given length may be inherently tuned to radio waves whose wavelengths are simple fractions or multiples of the length of the wire.
www.encyclopedia.com /html/a1/antenna.asp   (1076 words)

Antenna provides a set of Ant tasks suitable for developing wireless Java applications targeted at the Mobile Information Device Profile (MIDP).
With Antenna, you can compile, preverify, package, obfuscate, and run your MIDP applications (aka MIDlets), manipulate Java Application Descriptor (JAD) files, as well as convert JAR files to PRC files designed to run on the MIDP for PalmOS implementations from Sun and IBM.
The Antenna project is hosted on SourceForge and distributed under the GNU Lesser General Public License (LGPL).
antenna.sourceforge.net   (0 words)

 CDMA FAQ: Antenna questions   (Site not responding. Last check: )
This refers to the dipole, the distance from the tip of the antenna to the opposite end of the antenna buried inside the phone somewhere (usually near the bottom).
So cell phone manufacturers generally try to make the antenna 5/8's of a waveform, because if the antenna is at a slant, its cross-section relative to the impinging waveform will be near to the ideal half a wavelength.
If the antenna is exactly one wavelength long and is exactly perpendicular to the impinging waveform, it will pick up essentially no signal at all.
home.san.rr.com /denbeste/antenna.html   (473 words)

 Homebrew antenna shootout
Published on the internet and in a fine book by Rob Flickenger, the net admin for O'Reilly, this design for a do-it-yourself, VERY inexpensive antenna made from a recycled junkfood container is as cool as the other side of the pillow.
Waveguide antennas don't use the director assembly (the washery bits), and therefore are much simpler to build.
For the antennas I was building, I was using different measurements based on the antenna design material I had been reading.
www.turnpoint.net /wireless/has.html   (872 words)

 Use a Surplus Primestar Dish as an IEEE 802.11 Wireless Networking Antenna
The resulting antenna has about 22 db of gain, and is fed with 50 ohm coaxial cable.
This antenna is an offset fed dish, which means that the feed horn (our juice can) is not positioned as much in the way of an incoming signal, so it doesn't shadow the dish.
This antenna modification is for the IEEE 802.11b networking protocol that operates at 2.4 GHz.
www.wwc.edu /~frohro/Airport/Primestar/Primestar.html   (1152 words)

 Antenna Foundation English page
The Antenna Foundation is one of the oldest internet service providers in the Netherlands.
Antenna using COBRA webapplications converted completely the content and design of the existing website to a database driven Content Management System.
Antenna Technologies develops and implements appropriate technologies allowing local development of agricultural production, food supply and related sanitation covering basic essential needs of deprived populations and young children.
www.antenna.nl /indexeng.html   (249 words)

 Erecting an Antenna
If you have been told that you may not erect a small outdoor TV antenna, that is probably wrong.
There is a chance that the first antenna you install will not meet your expectations.
Although the dollar cost of an antenna system is modest, a lot of your time might be required.
www.hdtvprimer.com /ISSUES/erecting_antenna.html   (508 words)

 PCTEL's Antenna Specialists FAQs - "On-Glass" Installation   (Site not responding. Last check: )
The antenna cannot be cut and is specifically designed to resonate at the design frequencies with proper phasing between the elements.
The difference in performance for a typical installation relies on the antenna’s ability to clear the roofline and provide line-of-sight signal from the vehicle to the cell site, and its ability to focus the energy along the horizon for maximum range.
Antenna Specialists patented solid state coupling box allows the cable to be shortened during installation with no retuning needed.
www.antenna.com /faqs_ongl.html   (1591 words)

CEA's antenna mapping program, AntennaWeb.org, will help you determine the proper outdoor* antenna to use in order to receive your local television broadcast channels.
Whether the antenna you want is for use with a home satellite system, high-definition television (HDTV) or a traditional analog set, this site, based on geographical maps and signal strengths, will show you what you need to know to buy the right antenna.
*Indoor antennas are not included in this mapping system because many variables determine the quality of reception in a specific location.
www.antennaweb.org   (0 words)

 How to build a tin can waveguide antenna
One side is N-female for connecting the cable from your wireless equipment, and the other side has a small brass stub for soldering on wire.
It's location is derived from formulas that use the frequency that the antenna will operate at and the can diameter.
That means that how you rotate the antenna will affect the strength of your signal.
www.turnpoint.net /wireless/cantennahowto.html   (1085 words)

 Pringles Yagi Antenna
An antenna is an amplifier in a sense.
A useful fact here is that one antenna can and does serve for more than one frequency, but generally the ones in the middle will work better than the ones on the ends.
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)

 Antenna signal galvanic isolation
A ground loop in your AV system caused by antenna connection or TV cable is very common if you have your computer connected to the same system.
There is one disadvantage of this the circuit breaks the continuous shielding of the antenna cable which makes you antenna cable pick up radio interference more easily (for example radio interference picked by ground loop itself).
Isolator used in one old TV had 330 pF 500 VAC capacitor which connects the center of the coaxial cable to tuner and the shield of the coaxial cable was connected to TV chassis through high voltage feedthrough capacitor (value unknown).
www.epanorama.net /circuits/antenna_isolator.html   (1334 words)

Therefore, antenna radiation patterns or plots are a very important tool to both the antenna designer and the end user.
The collinear antenna was historically used by repeater sites, stacking various 1/2 wave dipole elements on top of each other for increased gain connected by some equipment to correct for phase error between the elements of the array.
Unfortunately, technical references containing slot antenna information rarely contain practical design information required to build such antennas reliably, and few experimenters have access to the resources needed to fully analyze the radiation properties of their antennas over wide bandwidths.
www.wlan.org.uk /antenna-page.html   (4326 words)

 The Original WINDOM Antenna, with complete construction details!   (Site not responding. Last check: )
Given that the impedance of most commonly available coax is either 50 or 72 ohms and since many wire antennas present an impedance of 200 to 600 ohms or more at the feed point, direct connection of the coax to wire antennas hits us with a significant signal loss due to the antenna impedance mismatch.
An antenna tuner is not out of the question, as it will provide an even better match between the transceiver and Windom, with less coupling loss and thus, greater transfer of energy (RF) to the antenna.
The Windom antenna is an off-center fed dipole with an unbalanced coax feedline.
www.packetradio.com /windom.htm   (5357 words)

 WiFi | Directional Wireless Panel Antenna
The antennas can be mounted in Vertical Polarization or Horizontal polarization by a simple change to the bracket mounting.
These antennas are designed to be used in installations where aesthetics and high performance are key factors.
If you purchase an omni antenna for your main "base station" antenna of your wifi system, it is best to purchase a directional antenna for your other systems for linking purposes.
www.radiolabs.com /products/antennas/2.4gig/2.4-flat-panel.php   (436 words)

 Dipl.-Ing. Alois Krischke
Even during his studies he was already specialized on antennas.
Apart from an extensive library (including literature on antennas as well as catalogs of professional and amateur antennas), he also owns a big private collection of antenna patents, reaching from the first antenna patents of Edison (USA 1885), Marconi (England 1896) and Braun (Germany 1898) until the present time .
He was the co-author of the book "Antennen-Lexikon" (Antenna Encyclopedia) and is continuing author of "Rothammels Antennenbuch" (10th, 11th, and 12th editions of the book) .
www.dj0tr.de /english/biografie.html   (376 words)

 Active Antenna
The secret is isolation from the noise source (ignition and electrical system), mounting the antenna on the outside of the the car body, and good impedance matching of the antenna to the receiver.
The antenna is made to a length of 12 to 48 inches as desired (suggested length = 24" for general use).
The antenna has been continuously powered for almost seven years, in good sunny 90 deg F weather, lightning storms, -20 F winter nights, ice and snow storms, and other assorted rotten weather New York State is famous for.
www.northcountryradio.com /Kitpages/actant.htm   (1121 words)

 AFC Profile for Antennas, Radomes, Microwave, Waveguide, Tallguide and Shelters
Patterning its terrestrial microwave point-to-point conical horn antenna product line after the highly successful Telstar horn developed by Bell Laboratories, AFC pioneered a complete line of highly precise, dimensionally stable composite fiberglass antennas in various sizes for frequency coverage through 40 Ghz.
Antenna options include cored ultra light reflectors, offset, embedded wire anti-ice or transportable systems and feeds for GOES, Intelsat, Receive/Transmit, Receive Only, Multi-satellite, International or FCC specified applications.
Satellite antenna sizes and models are found in the table.
www.afcsat.com /profile.html   (2182 words)

 Amazon.com: Antenna: Music: Cave In   (Site not responding. Last check: )
Antenna is a leap into a newly expansive, effects-laden sound that borrows from acts as alien to the hardcore spirit as Radiohead and Chicago post-rock champions Tortoise.
With Antenna however, the band wisely loses the hardguy pose and concentrates on actual songs while losing none of their instrumental punch.
When their proper followup arrives, I for one pray they are not tempted back to their old style and instead forge ahead in the direction of Antenna.
www.amazon.com /Antenna-Cave/dp/B00008MHAF   (1860 words)

 Antenna on the Cheap (er, Chip)
While a directional antenna showing between 12 and 15db gain is impressive, it's also pretty large, physically.
To estimate antenna performance, we started by connecting commercial antennas of known gain, and taking readings.
Over a clear line of sight, with short antenna cable runs, a 12db to 12db can-to-can shot should be able to carry an 11Mbps link well over ten miles.
www.oreillynet.com /cs/weblog/view/wlg/448   (1624 words)

 Antenna - Car Antenna - Power Antenna - Antenna Mast
Whether you need a power antenna, just an antenna mast, or a special high-gain antenna, we have a huge selection of car antennas that will provide a full signal to your car's am/fm receiver.
The antenna length and antenna materials used make a huge difference in the quality of reception you receive on your car stereo.
You still need a good car antenna to pick up the hundreds of AM/FM stations out there, and the time is going to come when you or a passenger want to listen to the radio.
www.car-stuff.com /antenna.htm   (232 words)

 Amazon.com: Zenith ZHDTV1 HDTV-UHF Digital Indoor Antenna (Silver and Black): Electronics   (Site not responding. Last check: )
Small, light, easily moved, the reception of this small un-amplified antenna is FAR better than that of the Terk one I upgraded from (and a fraction of the cost, I might add).
I should reiterate that this antenna is un-amplified, which means that unlike other HDTV antennas, you don't have to plug it into an outlet.
Being directional, you have to pivot the antennae to get reception for certain stations (which I expected), but once it was facing in the correct direction, I didn't get a signal any stronger than I did with my old bunny ears.
www.amazon.com /Zenith-ZHDTV1-HDTV-UHF-Digital-Antenna/dp/B00006FXR9   (1595 words)

 NASA - 'Borg' Computer Collective Designs NASA Space Antenna
Although they resemble bent paperclips, the antennas are highly efficient, according to scientists.
Slightly bigger than a quarter, each antenna, able to fit into a one-inch space (2.5 by 2.5 centimeters), can receive commands and send data to Earth from the satellites.
Following the first design of the ST5 satellite antenna, NASA Ames scientists used the software to 're-invent' the antenna design in less than a month to meet new specifications – a very quick turn-around in the space hardware redesign process.
www.nasa.gov /centers/ames/research/exploringtheuniverse/borg.html   (646 words)

 Amateur Radio Antenna Projects
Antenna Topics From G3YCC -- Loaded with antenna projects -- At least 20+ projects to choose from.
The reason for the coil in commercial dual band antennas is to phase the antenna currents so you actually end up with two colinear elements which both radiate at low angles, reinforcing each other and providing gain.
Given that the gain advantage of a 5/8 wave antenna over a 1/4 wave antenna is probably not noticeable except under the most difficult conditions, and even then may or may not make a difference, my suggestion is to stick with the 1/4 wave antenna.
www.ac6v.com /antprojects.htm   (3572 words)

 The Ultimate Guide to 11 Meter CB Antennas
This site should be of interest to all CB users and 11 meter DXers because the station antenna provides the most improvement in station performance (even more so than an amplifier) when it is built correctly.
Where to start reading if you are not really familiar with antenna basics such as radiation resistance, SWR, antenna bandwidth and polarization.
This is the section to read if you do not want to build your own antenna but figure out which commercial design best suites you.
signalengineering.com /ultimate   (684 words)

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