A yagi antennaside lobes in a two-dimensional power diagram (schematic, polar diagram)A multiband rotary directional antenna for Amateur Radio use
Discover great deals on the many top brand items available only on eBay!


Most simply, an antenna or aerial is an electronic component designed to transmit or receive radio waves. The words "antenna" and "aerial" are used throughout this article with precisely the same meaning. more...

Cell Phone
Accessories, Parts
Accessory Bundles, Packages
Kyocera, Qualcomm
LG, Touchpoint
Other Brands
Belt Clips, Holsters
Camera Attachments
Car Kits & Car Chargers
Cases, Pouches
Chargers, Cradle Chargers
Data Cables
Faceplates, Housings
LCD Screens
Manuals, User Guides
Memory Cards
Mounts, Holders
Other Accessories
Phones Only
Phones with New Plan...
Prepaid, No Contract Cards
Prepaid, No Contract Phones
Sim Cards
Straps & Charms
Tools, Screwdrivers
Unlocking Kits, Services
Wholesale & Large Lots

In the context of engineering and physics, the plural of antenna is "antennas", and it has been this way since about 1950 (or sooner), when a cornerstone textbook in this field, Antennas, was published by John D. Kraus of the Ohio State University. Besides the title, Dr. Kraus noted this in a footnote on the first page of his book. Insects may have "antennae" but not in technical contexts.

More specifically, an antenna is an arrangement of conductors designed to radiate (transmit) an electromagnetic field in response to an applied alternating electromotive force (EMF) and the associated alternating electric current.

Alternatively, if an antenna is placed into an electromagnetic field, that field will induce an alternating current upon the antenna, and EMF between its terminals. See radio frequency induction.


There are two fundamental types of antennas, which, with reference to a specific three dimensional (usually horizontal or vertical) plane, are either omni-directional (radiate equally in the plane) or directional (radiates more in one direction than in the other). All antennas radiate some energy in all directions but careful construction results in large directivity in certain directions and negligible power radiated in other directions.

By adding additional conducting rods or coils (called elements) and varying their length, spacing, and orientation, an antenna with specific desired properties can be created, such as a Yagi-Uda Antenna (often abbreviated to "Yagi"). Typically, antennas are designed to operate in a relatively narrow frequency range. The design criteria for receiving and transmitting antennas differ slightly, but generally an antenna can receive and transmit equally well. This property is called reciprocity.

Read more at Wikipedia.org

[List your site here Free!]

Click to see more Antennas items at ebay.com
Prices current as of last update, 05/17/08 2:52am.

See also...
Audiovox, Antennas
Kyocera, Qualcomm, Antennas
LG, Touchpoint, Antennas
Motorola, Antennas
Nokia, Antennas
Other Brands, Antennas
Samsung, Antennas
Sanyo, Antennas

Home Contact Resources Exchange Links eBay