Rhombic antenna (1573 bytes)
1: ...[[broadband]] directional [[antenna (electronics)|antenna]], mostly used in HF (high frequency, also called...
3: It is named after its "[[rhombus|rhombic]]" diamond shape, with each side typically being ...
5: The rhombic antenna can radiate close to the horizon or at a higher a...
7: ...erable size, it is not very practical as the sole antenna of a radio station if operating conditions are ex...
9: ...ceptible to sharply localized fading than smaller antennas.

Rhombic triacontahedron (2488 bytes)
2: !bgcolor=#e7dcc3 colspan=2|Rhombic triacontahedron
4: ...icture for large version.''<br>''Click ''[[:image:rhombictriacontahedron.gif|here]]'' for spinning version....
24: ... [[polyhedron]] with [[30 (number)|30]] [[rhombus|rhombic]] faces. It is the polyhedral [[Dual polyhedron|...
26: ...octahedron]], the [[icosidodecahedron]] and the [[rhombic dodecahedron]].
28: The rhombic triacontahedron forms the (hull of) the projectio...

Rhombic dodecahedron (2954 bytes)
2: !bgcolor=#e7dcc3 colspan=2|Rhombic dodecahedron
4: ...icture for large version.''<br>''Click ''[[:image:rhombicdodecahedron.gif|here]]'' for spinning version.''
24: ... [[polyhedron]] with [[12 (number)|12]] [[rhombus|rhombic]] faces. It is the polyhedral [[Dual polyhedron|...
26: ...octahedron]], the [[icosidodecahedron]] and the [[rhombic triacontahedron]].
28: ...|thumb|left|Part of a tessellation of space using rhombic dodecahedra]]

Rhombic drive (1291 bytes)
1: The rhombic drive is a specific method of transferring mechan...

Antenna (636 bytes)
1: ..., '''[[Antenna (biology)|antenna]]''' (plural: '''antennae''') refers to the sensing organs of several [[ar...
2: ...'[[Antenna (electronics)|antenna]]''' (plural: '''antennas''') refers to the component designed to send and...
3: * [[ANT1|Antenna]], also known as ANT1, is a Greek-language terres...
4: *In [[astronomy]], '''[[Antennae (astronomy)|Antennae]]''' is the name of two colliding galaxies [[NGC...

Omnidirectional antenna (639 bytes)
1: ...ectional antenna''' is an [[antenna (electronics)|antenna]] system which radiates maximum power uniformly i...
3: ...fectly omnidirectional antenna is the [[isotropic antenna]],
4: a theoretical construct derived from actual antenna
6: and used as a reference for specifying antenna [[gain]]
9: Practical antennas approach omnidirectionality by providing

T2FD Antenna (2358 bytes)
1: ...ral-purpose [[shortwave]] [[antenna (electronics)|antenna]] developed in the late [[1940s]] by the [[United...
5: While in many ways measurably inferior to antennas specifically designed for given frequency bands,...
18: Such an antenna is usable for both local and medium-long distance...
20: For example, an antenna for the lower portion of shortwave (3 - 18 MHz) w...
22: ...he higher portion of shortwave (5 - 30 MHz), this antenna will be roughly 20m (66 feet) long, with a spacin...

Antenna tuner (443 bytes)
1: ...trically elongated antenna is never as good as an antenna with the precise physical length.
5: [[category: antenna terminology]]

Whip antenna (1301 bytes)
1: ...ble, so that they don't break when struck. These antennas derive their name from the [[whip (implement)|wh...
3: ...rtened with a [[loading coil]] anywhere along the antenna. Whips are generally a fraction of their actual ...
5: Being vertically mounted causes the whip antenna to have vertical [[polarization]]. Whips are tho...
7: [[Category:Radio frequency antenna types]]

Dipole antenna (2943 bytes)
1: ... is probably the most common and simplest-looking antenna.
3: ...the same, and their overall length determines the antenna's [[wavelength]]. The two elements are fed the s...
5: The most common dipole antenna is the kind used with [[television]]s called "rab...
7: ...ed to the proper length it is helpful if portable antennas are adjustable to allow for local conditions whe...
9: Dipoles are more efficient than whip antennas. Dipoles have a toroidal [[radiation pattern]] ...

Helical antenna (1282 bytes)
1: ...ntenna]] with a circular [[polarization]]. These antennas are best suited for space communication, where t...
3: ...or vertical polarization, but clockwise polarized antennas suffer a severe [[gain]] loss when receiving cou...
5: ...ectional the antenna will be and its gain; longer antennas will be more sensitive in the direction in which...
8: *[[Telstar]] (article includes image of a helical antenna)
10: [[Category:Radio frequency antenna types]]

Horn Antenna (6273 bytes)
1: ...sey.jpeg|thumb|right|300px|Photograph of the Horn Antenna]]
2: ...Robert Wilson]]. In [[1965]] while using the Horn Antenna, Penzias and Wilson stumbled on the [[microwave b...
6: The Horn Antenna at Bell Telephone Laboratories in Holmdel, New Je...
8: ...a connecting line, is an important feature of the antenna. A radiometer for measuring the intensity of radi...
10: ...al force of 100 pounds is sufficient to start the antenna in motion.

Beverage antenna (1766 bytes)
1: ...erage]], it is ''not'' a beverage can or beer can antenna.
3: ... easily rotated so installations may use multiple antennas to provide a choice of orientation.
5: ...termination to be used for one specific installed antenna.
10: *[http://www.qsl.net/aa3px/ AA3PX Antenna design page]
11: ...://www.angelfire.com/mb/amandx/bevant.html AMANDX antenna page]

Antenna analyzer (1829 bytes)
1: An '''antenna analyzer''' (or noise bridge, or RX bridge) is a ...
3: ... receiver will reach a null (minimum). Tuning the antenna for the desired frequency then becomes a simple m...
5: ...l when the antenna is balanced. A badly mistuned antenna can produce enough reflected power to damage the ...

Dish antenna (308 bytes)
1: ...ich a [[parabolic dish]] focuses a signal onto an antenna, located at the parabola's focal point. These dis...

Directional antenna (433 bytes)
1: ...ectional antenna''' is an [[antenna (electronics)|antenna]] which transmits or receives maximum power in a ...
3: ...ractical antennas can easily be [[omnidirectional antenna|omnidirectional]] in one plane.
4: [[Category:Radio frequency antenna types]]

Fractal antenna (977 bytes)
3: ...iven total surface area. For this reason, fractal antennas are very compact and are anticipated to have use...
5: ...-- and its harmonics? -->. This makes the fractal antenna an excellent design for [[broadband]] application...
7: Contrast: [[Waveguide]] antenna.
11: [[Category:Radio frequency antenna types]]

Billboard antenna (562 bytes)
1: ...l elements of the array. ''Synonym'' '''broadside antenna'''.
4: [[Category:Radio frequency antenna types]]

Antenna aperture (576 bytes)
1: ...eter of the cross-section of an [[antenna (radio)|antenna]]'s radiation pattern in the direction of highest...
3: ...tion passing within the circle is absorbed by the antenna.
5: See "[[Antenna (radio)]]" for more details.
9: [[Category:Antenna terminology]]

Antenna gain (2640 bytes)
1: ...otropic antenna]] in any direction, or a [[dipole antenna]] in the equatorial direction. The two measuremen...
3: ...nsmitted/received. In general, a larger aperture antenna has a higher gain. Also, the higher the frequenc...
5: ...he narrow corridor or "boresight" along which the antenna looks up at the sky.
7: ...uated or tapered, which leads us to conclude that antenna gain is not as important a factor as it might fir...
9: ...(pronounced "G over T"); that is, the gain of the antenna (in dB) minus the noise temperature of the receiv...

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