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Topic: Antenna electronics


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  Dipole antenna :: Radio-Electronics.Com
Often the effect is to lower the impedance, and when used in some antennas the feed impedance of the dipole element may fall to ten ohms or less, and methods need to be used to ensure a good match is maintained with the feeder.
Although the antenna may be an electrical half wavelength, or multiple of half wavelengths, it is not exactly the same length as the wavelength for a signal travelling in free space.
Typically it is between 0.96 and 0.98 and is mainly dependent upon the ratio of the length of the antenna to the thickness of the wire or tube used as the element.
www.radio-electronics.com /info/antennas/dipole/dipole.php   (893 words)

  
  Antenna (electronics)
The yagi antenna is a directional variation of the dipole with parasitic elements added with functionality similar to adding a reflector and lenses (directors) to focus a filament lightbulb.
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.
www.nebulasearch.com /encyclopedia/article/Antenna_(electronics).html   (2133 words)

  
 Antenna (electronics) - LearnThis.Info Enclyclopedia   (Site not responding. Last check: 2007-11-07)
Antennas can be made resonant on harmonic frequencies and with lengths that are fractions of the target frequency.
Complex impedance of an antenna is related to the electrical length of the antenna at the wavelength in use.
The polarization of an antenna is the polarization of the signals it emits.
encyclopedia.learnthis.info /a/an/antenna__electronics_.html   (2186 words)

  
 Antenna (radio) - Wikipedia, the free encyclopedia
Antennas used for transmission have a maximum power rating, beyond which heating, arcing or sparking may occur in the components, which may cause them to be damaged or destroyed.
The Beverage antenna is a form of directional long-wire antenna which uses a resistive termination at one end and feed from the other.
The helical antenna is a directional antenna suited for receiving signals that are either circular polarized or randomly polarized.
en.wikipedia.org /wiki/Antenna_(electronics)   (2683 words)

  
 Antenna (radio) - Wikipedia, the free encyclopedia   (Site not responding. Last check: 2007-11-07)
Antennas used for transmission have a, beyond which heating, arcing or sparking may occur in the components, which may cause them to be damaged or destroyed.
Microstrip antennas are the most commonly used antennas in, satellite links, and so on because circuit functions can be directly integrated to the microstrip antenna to form compact and spatial power combiners.
The Beverage antenna is a form of directional which uses a resistive termination at one end and feed from the other.
www.bonneylake.us /project/wikipedia/index.php/Antenna_(electronics)   (2593 words)

  
 Omnidirectional antenna - Wikipedia, the free encyclopedia
An omnidirectional antenna is an antenna system which radiates maximum power uniformly in all directions.
The perfectly omnidirectional antenna is the isotropic antenna, a theoretical construct derived from actual antenna radiation patterns and used as a reference for specifying antenna gain and radio system effective radiated power.
An often encountered types of an omnidirectional antenna are a whip antenna, a vertically oriented dipole antenna, or the discone antenna.
en.wikipedia.org /wiki/Omnidirectional_antenna   (118 words)

  
 Dipole Antenna :: Electronics and Radio Today
The dipole antenna or dipole aerial is one of the most important and also one of the most widely used types of antenna.
The impedance is measured in ohms, and to ensure that the maximum amount of power is transferred between the feeder and the antenna, it is necessary to ensure that the antenna and feeder impedances are matched, i.e.
Additionally many antennas have to be able to operate over large bandwidths and a standard dipole may be unable to fulfil this requirement adequately.
www.electronics-radio.com /articles/radio/antennas/dipole/dipole-antenna.php   (1586 words)

  
 Tire electronics assembly having a multi-frequency antenna - Patent 7091841
Electronics assembly 30 can be mounted directly to the interior surface location of tire structure 12 or can first be embedded in a dielectric casing, which is then mounted to the interior surface of tire structure 12.
For instance, antenna wires 34 and 36 may be soldered to respective pads on RF device 32, or they may be pinned into or onto the electronics package, or attached using clamps; screws, conductive adhesive, or other means as within the purview of one of skill in the art.
The exemplary electronics assemblies 30a 30g, respectively and corresponding antenna structures presented herein are designed to operate at multiple different frequencies, and in the specific examples presented herein, are designed to operate at a first resonant frequency and at a second resonant frequency.
www.freepatentsonline.com /7091841.html   (6233 words)

  
 Radio-Electronics.Com :: Antenna, Feeder and RF Connector Topics
Antennas (or aerials) are an essential element of any radio link, whether it is for a high power transmitter like those used for broadcasting, or low power ones like those used wireless technologies such as WLAN or remote control and sensing applications.
Antenna diplexer - although not a feeder, a diplexer is sometimes included in the feed system of an antenna.
Antennas can be used in many applications from reception of terrestrial and satellite television to point to point radio, short wave radio and much more.
www.radio-electronics.com /info/antennas/index.php   (709 words)

  
 Howstuffworks "Electronics Channel"
How Electric Motors Work How Electromagnets Work How Electronic Gates Work How Flash Memory Works How Inductors Work How LCDs Work How Light Emitting Diodes Work How Lithium-ion Batteries Work How Microcontrollers Work How much power does a small transformer consume if it is...
The superstar of all electronic appliances is the computer.
Electronic innovation and advances in information technology mean more cool gadgets.
electronics.howstuffworks.com   (1642 words)

  
 CB Base Station Antenna Recalled by Antron Antenna Research & Electronics   (Site not responding. Last check: 2007-11-07)
If contact is made by the antennas with an electrical power line while being installed or taken down, the antennas have the potential for severe or fatal shock.
Electrocution deaths continue to occur each year from CB antennas which fail to comply with the standard.
Antron Antenna Research f Electronics distributed approximately 100 of the affected antennas nationwide.
www.cpsc.gov /cpscpub/prerel/prhtml87/87017.html   (381 words)

  
 Doug's R-E Loop Article Page
Loop antennas, when used at low frequencies, are subject to that effect because their size is aonly a fraction of a wavelength, and they pick up interference from a signal derived from the electric, rather than the magnetic, field.
That is done by coupling the output of the vertical antenna to the loop so that the voltage induced in the loop by the coupling is 90 degrees out of phase with the voltage the passing wave induces in the vertical antenna.
When designing an active whip antenna, we considered the whip to be a voltage source with a high internal impedance requiring current amplification, and (to reduce attenuation due to a mismatch) we wanted the preamplifier also to have a high input impedance.
user.netonecom.net /~swordman/Radio/re-loop-article.htm   (3687 words)

  
 Raytheon receives GPS anti-jam development contracts for Digital Antenna Electronics | SpaceRef - Your Space Reference
Raytheon's Precision Guidance Systems (PGS) organization was awarded a $1.9 million option to its Digital Antenna Electronics (DAE) contract with the U. Navy's Space & Naval Warfare Systems Center for GPS anti-jam research and development.
The NAVWAR program was tasked with protecting DoD and allied use of GPS during times of conflict, preventing its use by adversaries, and maintaining normal availability to the civil user outside the area of conflict.
The present anti-jam antenna system in production, GPS Antenna System—1 (GAS-1), is an analog system with anti-jam capability limited to the formation of spatial nulls in the direction of interference.
www.spaceref.com /news/viewpr.html?pid=9484   (1026 words)

  
 GPS antenna
A GPS receiver is composed of an antenna unit for receiving high frequency satellite signals and a processing unit for processing the signals to compute positional coordinates of the GPS receiver.
A GPS antenna is flat, and small in size, and generally this antenna and a high-frequency circuit board (for effecting processings for the received radio waves) are combined together to form a unit (GPS antenna unit).
In the GPS, active antenna electronics adjust the gain and the phase of a multi-element antenna array in order to steer the antenna pattern away from an interference source which may serve to jam the satellite ranging signals.
www.electronics-manufacturers.com /info/satellite-communications/gps-antenna.html   (925 words)

  
 I-Hacked.com Taking Advantage Of Technology - Antenna Concepts and Building a "Coffee Can" Antenna   (Site not responding. Last check: 2007-11-07)
Since an antenna is a metal object with a corresponding wire connection and is elevated several feet in the air, it unfortunately makes an excellent lightning rod.
The antennas commonly have separate connectors for both H and V polarity It is not possible to operate at both polarities simultaneously.
As outdoor mounted antennas are at risk of lightning strikes, make sure to use a lightning arrestor and proper grounding for both your antenna and mast.
www.i-hacked.com /content/view/133/89   (4311 words)

  
 Sangean ANT-60 Short Wave Antenna - Electronics
I attached it to the antenna on my Grundig pocket radio and had great results, really strengthened the signal.
This is pretty clearly a generic antenna that would work on most if not all radios.
I recommend this antenna to anyone who wants to enhance their listening on portable shortwave radios.
www.electronicspatron.biz /B000023VW2.html   (203 words)

  
 Buy.com - TERK HDTVi Indoor UHF/VHF HDTV Antenna - HDTVI
Most of the antennas available today are large and unwieldy and need to be mounted outdoors or in a cramped attic.
The solution is a quality indoor antenna, which can pick up all local HDTV channels; one that will look great next to your television and one that is easy to install.
The antenna is small, neatly fits anywhere, couldn't be easier to assemble or use.
www.buy.com /prod/TERK_HDTVi_Indoor_UHF_VHF_HDTV_Antenna/q/loc/111/90130391.html   (1176 words)

  
 Motor Boating Magazine - Electronics - Digital Antenna
To solve this problem, Digital Antenna has developed a cell phone amplifier with special antennas that can extend the range of those.6-watt units (.2 watt in the case of higher frequency Sprint PCS units) out 50 miles or more.
Though its 3 watts is an FCC maximum, this linear amplifier has a dynamic variable control to adjust output power so it doesn’t overload the antennas when relatively near the cell towers.
The antenna has a two-cable pigtail for use with a VHF and a cell phone, regardless of model.
motorboating.com /motorboat/electronics/article/0,12696,454562,00.html   (307 words)

  
 RCA ANT200 VHF/UHF/FM Amplified Indoor Antenna - Electronics
Once this antenna is set and positioned on my TV, it can picks up all the HD channels.
Because I not longer have cable and some channels like PBS are still not in HD, I also use this antenna to pick up the non-HD channels.
Like some other reviews say, this antenna is poor at picking up VHF range (channel 2 - 13) and acceptable at picking up UHF range (channel 14 - 69).
www.electronicspatron.net /B00000J0BM.html   (284 words)

  
 t_r_lopar   (Site not responding. Last check: 2007-11-07)
Rotating radome - contained the antenna which was adjustable in angle.
The IFF antenna, electronics, and operations tend to remain classified, and are not present on the site.
An antenna used to help sense and counter certain forms of jamming.
www.ed-thelen.org /t_r_lopar.html   (172 words)

  
 CB Base Station Antenna Recalled by Antron Antenna Research & Electronics
If contact is made by the antennas with an electrical power line while being installed or taken down, the antennas have the potential for severe or fatal shock.
However, during the 5 year period prior to the CPSC's safety standard, and estimated 450 CB antenna related electrocutions occurred as a result of the antennas being put up or taken down.
Electrocution deaths continue to occur each year from CB antennas which fail to comply with the standard.
www.keepkidshealthy.com /recalls/electronics/87017.html   (473 words)

  
 Terk TV36 Outdoor rooftop UHF/VHF/FM/HDTV antenna: Etail Electronics
Terk's TV36 outdoor antenna is what you need to start taking advantage of the over-the-air digital broadcasts available in your area.
High-tensile aluminum construction means this antenna can withstand the stresses of wind and ice, and the antenna elements are protected from oxidation by a polymer coating.
The antenna elements are protected with a high-quality polymer finish to protect the surface from oxidation.
www.etailelectronics.com /store/02884.html   (381 words)

  
 Wilson Electronics Yagi Cellular Antenna   (Site not responding. Last check: 2007-11-07)
The Wilson Yagi Cellular Antenna has a gain of 13 dBi at 855 MHz.
This antenna has been designed to work in remote areas to bring the signal to you.
It is a 9 element directional Yagi Beam Antenna.
www.decisionweather.com /catalog/wilson_electronics_yagi_cellular_antenna_1889606.htm   (125 words)

  
 Rohde&Schwarz HE100 + KOFFER: The Rohde & Schwarz HE 100 is an Active Antenna, hand ...
Here we are offering the antenna with antenna element for (100) 500 to 1000 MHz only (XX) = with reduced sensitivity.
The supply voltage of the active antenna electronics comes from 4 ordinary 1,5 V batteries, which are placed into the pistol grip.
The antenna element and the basic antenna unit are stored in a samsonite-like, rugged suitcase
www.helmut-singer.de /stock/-746366717.html   (284 words)

  
 Motor Boating Magazine - Electronics - Digital Antenna
To solve this problem, Digital Antenna has developed a cell phone amplifier with special antennas that can extend the range of those.6-watt units (.2 watt in the case of higher frequency Sprint PCS units) out 50 miles or more.
Though its 3 watts is an FCC maximum, this linear amplifier has a dynamic variable control to adjust output power so it doesn’t overload the antennas when relatively near the cell towers.
The antenna has a two-cable pigtail for use with a VHF and a cell phone, regardless of model.
www.motorboating.com /motorboat/electronics/article/0,12696,454562,00.html   (315 words)

  
 Radio Science - Advanced Antenna Technology   (Site not responding. Last check: 2007-11-07)
Antennas are key components in all radiocommunication systems.
CRC’s antenna R&D activities cover hardware and software investigations pertinent to state-of-the-art, low profile, active and passive antennas and array technologies for applications from L-Band to the millimetrewave band.
Such tools are used to aid in understanding the performance and radiation characteristics of antennas and ensure compatibility in their operational environments.
www.crc.ca /en/html/crc/home/research/wireless/antennas   (203 words)

  
 Sangean ANT-60 Short Wave Antenna - Electronics
When fully unreeled, a 14-foot antenna comes out of the container.
As soon as I first turned on the shortwave radio, I tried each of the shortwave bands and also the FM band with just the radio's telescopic antenna.
Then I clipped the Sangean short wave antenna onto the radio's antenna and received the rest of the broadcasts.
electronics.realbuy.ws /B000023VW2.html   (229 words)

  
 Rohde&Schwarz HE100 SOLO: The Rohde & Schwarz HE 100 is an Active Antenna, hand ...   (Site not responding. Last check: 2007-11-07)
Der Wert in Klammern gilt bei etwas eingeschränkter Empfindlichkeit.
Here we are offering the antenna with antenna element for (100) 500 to 1000 MHz only.
This antenna mainly is used to detect sources of interference or small, hidden transmitters (bugs).
www.helmut-singer.de /stock/-1580247160.html   (253 words)

  
 >☞ Terk Technology TV-55 UHF/VHF HDTV Indoor/Outdoor Amplified Antenna Electronics   (Site not responding. Last check: 2007-11-07)
I have never had such a lousy Antenna in my life..also, found out that..you DO NOT have to have a special antenna to pickup HD or Digital signals..all you need is a good old fashioned UHF antenna from Radio Shack..it will do the job perfectly and for only about 25 bucks.
I thought that I had a problem with the antenna, when in fact I needed to reset my HD receiver box.
The antenna is now working quite well and I am very pleased.
plasmatelevision.bestpricefan.com /terk-tv55-indooroutdoor-amplified-antenna-_B00005T3A9_i.htm   (1312 words)

  
 Raytheon Receives GPS Anti-Jam Development Contracts for Digital Antenna Electronics   (Site not responding. Last check: 2007-11-07)
Threats range from cheap, expendable, low-power jammers that can be widely distributed across an area of conflict, to medium and high-power ground and air-based jammers that can deny usage of GPS over hundreds of miles.
The NAVWAR program was tasked with protecting DoD and allied use of GPS during times of conflict, preventing its use by adversaries, and maintaining normal availability to the civil user outside the area of conflict.
The present anti-jam antenna system in production, GPS Antenna System-1 (GAS-1), is an analog system with anti-jam capability limited to the formation of spatial nulls in the direction of interference.
www.prnewswire.com /cgi-bin/micro_stories.pl?ACCT=910470&TICK=RTNB9&STORY=/www/story/01-14-2003/0001872070&EDATE=Oct+10,+2002   (527 words)

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