Skip to main content
Select Source:

antenna

antenna (ăntĕn´ə), in electronics, system of wires or other conductors used to transmit or receive radio or other electromagnetic waves (see radio); sometimes called an aerial. The idea of using an antenna was developed by Guglielmo Marconi (c.1897). In a transmitting antenna, the signal from an electronic circuit causes electrons in the antenna to oscillate; these moving electric charges generate electromagnetic radiation, which is transmitted through the air and space. 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. In a receiving antenna electromagnetic waves cause the electrons to oscillate, inducing a signal that can be detected by an electronic circuit. 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. In general, a longer antenna is used to transmit or receive signals of longer wavelength. Although theoretically, the same antenna can be used both for sending and receiving signals, in many instances transmitting antennas are designed differently from receiving antennas, especially if they must handle very high power loads. Any straight vertical conductor may serve as an antenna and will transmit to or receive from all directions. A horizontal antenna radiates or intercepts energy principally at right angles to itself; the use of horizontal antennas enables transmitters to concentrate or beam their signals into desired areas and enables receivers to select one of several signals having the same frequency but arriving with different polarizations. The dish-shaped microwave antenna is highly directional; it uses a parabolic reflector to focus received signals on a small antenna element. Phased array antennas, used for long range radar and radio astronomy, are composed of large groupings of individual antennas; they may be electronically aimed by changing the relative phase of the signal at each element.

Cite this article
Pick a style below, and copy the text for your bibliography.

  • MLA
  • Chicago
  • APA

"antenna." The Columbia Encyclopedia, 6th ed.. . Encyclopedia.com. 5 Nov. 2018 <https://www.encyclopedia.com>.

"antenna." The Columbia Encyclopedia, 6th ed.. . Encyclopedia.com. (November 5, 2018). https://www.encyclopedia.com/reference/encyclopedias-almanacs-transcripts-and-maps/antenna

"antenna." The Columbia Encyclopedia, 6th ed.. . Retrieved November 05, 2018 from Encyclopedia.com: https://www.encyclopedia.com/reference/encyclopedias-almanacs-transcripts-and-maps/antenna

Learn more about citation styles

Citation styles

Encyclopedia.com gives you the ability to cite reference entries and articles according to common styles from the Modern Language Association (MLA), The Chicago Manual of Style, and the American Psychological Association (APA).

Within the “Cite this article” tool, pick a style to see how all available information looks when formatted according to that style. Then, copy and paste the text into your bibliography or works cited list.

Because each style has its own formatting nuances that evolve over time and not all information is available for every reference entry or article, Encyclopedia.com cannot guarantee each citation it generates. Therefore, it’s best to use Encyclopedia.com citations as a starting point before checking the style against your school or publication’s requirements and the most-recent information available at these sites:

Modern Language Association

http://www.mla.org/style

The Chicago Manual of Style

http://www.chicagomanualofstyle.org/tools_citationguide.html

American Psychological Association

http://apastyle.apa.org/

Notes:
  • Most online reference entries and articles do not have page numbers. Therefore, that information is unavailable for most Encyclopedia.com content. However, the date of retrieval is often important. Refer to each style’s convention regarding the best way to format page numbers and retrieval dates.
  • In addition to the MLA, Chicago, and APA styles, your school, university, publication, or institution may have its own requirements for citations. Therefore, be sure to refer to those guidelines when editing your bibliography or works cited list.

Antenna

Antenna

An antenna is a device used to transmit and receive electromagnetic waves, such as radio waves and microwaves. Antennas are found in a great variety of communication devices, including radios and television sets, weather radar systems, satellite communications systems, and radio astronomy research centers.

Your local radio station uses an antenna to transmit the programs it broadcasts. Words that are spoken or music that is played within the station are converted to electrical signals. These signals are then transmitted to an antenna in the form of an electric current. Electrons inside the antenna vibrate back and forth with the same frequency as the incoming

electric current. The vibration is characteristic of the sounds produced within the station. As these electrons vibrate, they create an electromagnetic wave in the air around the antenna. That wave spreads out and travels in all directions from the antenna. The frequency of the wave is the same as the frequency of the electron vibration in the antenna and of the sounds spoken in the station.

An antenna placed in the path of these waves reverses the above process. Electromagnetic waves in the air cause electrons in the receiving antenna to begin vibrating. The frequency of vibration is the same in the receiving antenna as it is in the wave. The vibrating electrons are converted into an electrical current, which travels into your radio receiver and is converted back into sound.

Antennas come in all sizes and shapes, from the tiny units found in miniature transistor radios to the massive structures used to transmit messages to and receive messages from outer space.

[See also Microwave communication; Radar; Radio ]

Cite this article
Pick a style below, and copy the text for your bibliography.

  • MLA
  • Chicago
  • APA

"Antenna." UXL Encyclopedia of Science. . Encyclopedia.com. 5 Nov. 2018 <https://www.encyclopedia.com>.

"Antenna." UXL Encyclopedia of Science. . Encyclopedia.com. (November 5, 2018). https://www.encyclopedia.com/science/encyclopedias-almanacs-transcripts-and-maps/antenna-1

"Antenna." UXL Encyclopedia of Science. . Retrieved November 05, 2018 from Encyclopedia.com: https://www.encyclopedia.com/science/encyclopedias-almanacs-transcripts-and-maps/antenna-1

Learn more about citation styles

Citation styles

Encyclopedia.com gives you the ability to cite reference entries and articles according to common styles from the Modern Language Association (MLA), The Chicago Manual of Style, and the American Psychological Association (APA).

Within the “Cite this article” tool, pick a style to see how all available information looks when formatted according to that style. Then, copy and paste the text into your bibliography or works cited list.

Because each style has its own formatting nuances that evolve over time and not all information is available for every reference entry or article, Encyclopedia.com cannot guarantee each citation it generates. Therefore, it’s best to use Encyclopedia.com citations as a starting point before checking the style against your school or publication’s requirements and the most-recent information available at these sites:

Modern Language Association

http://www.mla.org/style

The Chicago Manual of Style

http://www.chicagomanualofstyle.org/tools_citationguide.html

American Psychological Association

http://apastyle.apa.org/

Notes:
  • Most online reference entries and articles do not have page numbers. Therefore, that information is unavailable for most Encyclopedia.com content. However, the date of retrieval is often important. Refer to each style’s convention regarding the best way to format page numbers and retrieval dates.
  • In addition to the MLA, Chicago, and APA styles, your school, university, publication, or institution may have its own requirements for citations. Therefore, be sure to refer to those guidelines when editing your bibliography or works cited list.

antenna

an·ten·na / anˈtenə/ • n. 1. Zool. (pl. -ten·nae / -ˈtenē/ ) either of a pair of long, thin sensory appendages on the heads of insects, crustaceans, and some other arthropods. ∎  (antennae) fig. the faculty of instinctively detecting and interpreting subtle signs: he has the political antennae of a party whip. 2. (pl. -ten·nas ) a rod, wire, or other device used to transmit or receive radio or television signals. DERIVATIVES: an·ten·nal / -ˈtenl/ adj. (in sense 1). an·ten·na·ry / -ˈtenərē/ adj. (in sense 1).

Cite this article
Pick a style below, and copy the text for your bibliography.

  • MLA
  • Chicago
  • APA

"antenna." The Oxford Pocket Dictionary of Current English. . Encyclopedia.com. 5 Nov. 2018 <https://www.encyclopedia.com>.

"antenna." The Oxford Pocket Dictionary of Current English. . Encyclopedia.com. (November 5, 2018). https://www.encyclopedia.com/humanities/dictionaries-thesauruses-pictures-and-press-releases/antenna-0

"antenna." The Oxford Pocket Dictionary of Current English. . Retrieved November 05, 2018 from Encyclopedia.com: https://www.encyclopedia.com/humanities/dictionaries-thesauruses-pictures-and-press-releases/antenna-0

Learn more about citation styles

Citation styles

Encyclopedia.com gives you the ability to cite reference entries and articles according to common styles from the Modern Language Association (MLA), The Chicago Manual of Style, and the American Psychological Association (APA).

Within the “Cite this article” tool, pick a style to see how all available information looks when formatted according to that style. Then, copy and paste the text into your bibliography or works cited list.

Because each style has its own formatting nuances that evolve over time and not all information is available for every reference entry or article, Encyclopedia.com cannot guarantee each citation it generates. Therefore, it’s best to use Encyclopedia.com citations as a starting point before checking the style against your school or publication’s requirements and the most-recent information available at these sites:

Modern Language Association

http://www.mla.org/style

The Chicago Manual of Style

http://www.chicagomanualofstyle.org/tools_citationguide.html

American Psychological Association

http://apastyle.apa.org/

Notes:
  • Most online reference entries and articles do not have page numbers. Therefore, that information is unavailable for most Encyclopedia.com content. However, the date of retrieval is often important. Refer to each style’s convention regarding the best way to format page numbers and retrieval dates.
  • In addition to the MLA, Chicago, and APA styles, your school, university, publication, or institution may have its own requirements for citations. Therefore, be sure to refer to those guidelines when editing your bibliography or works cited list.

antenna

antenna A long whiplike jointed mobile paired appendage on the head of many arthropods, usually concerned with the senses of smell, touch, etc. (see sensillum). In insects, millipedes, and centipedes they are the first pair of head appendages and are specialized and modified in many insects. In crustaceans they are the second pair of head appendages, the first pair (the antennules) having the sensory function, while the antennae are modified for swimming and for attachment.

Cite this article
Pick a style below, and copy the text for your bibliography.

  • MLA
  • Chicago
  • APA

"antenna." A Dictionary of Biology. . Encyclopedia.com. 5 Nov. 2018 <https://www.encyclopedia.com>.

"antenna." A Dictionary of Biology. . Encyclopedia.com. (November 5, 2018). https://www.encyclopedia.com/science/dictionaries-thesauruses-pictures-and-press-releases/antenna-0

"antenna." A Dictionary of Biology. . Retrieved November 05, 2018 from Encyclopedia.com: https://www.encyclopedia.com/science/dictionaries-thesauruses-pictures-and-press-releases/antenna-0

Learn more about citation styles

Citation styles

Encyclopedia.com gives you the ability to cite reference entries and articles according to common styles from the Modern Language Association (MLA), The Chicago Manual of Style, and the American Psychological Association (APA).

Within the “Cite this article” tool, pick a style to see how all available information looks when formatted according to that style. Then, copy and paste the text into your bibliography or works cited list.

Because each style has its own formatting nuances that evolve over time and not all information is available for every reference entry or article, Encyclopedia.com cannot guarantee each citation it generates. Therefore, it’s best to use Encyclopedia.com citations as a starting point before checking the style against your school or publication’s requirements and the most-recent information available at these sites:

Modern Language Association

http://www.mla.org/style

The Chicago Manual of Style

http://www.chicagomanualofstyle.org/tools_citationguide.html

American Psychological Association

http://apastyle.apa.org/

Notes:
  • Most online reference entries and articles do not have page numbers. Therefore, that information is unavailable for most Encyclopedia.com content. However, the date of retrieval is often important. Refer to each style’s convention regarding the best way to format page numbers and retrieval dates.
  • In addition to the MLA, Chicago, and APA styles, your school, university, publication, or institution may have its own requirements for citations. Therefore, be sure to refer to those guidelines when editing your bibliography or works cited list.

antenna

antenna One of a pair of sensory structures which grow from the head of an invertebrate animal. Antennae may be long and filiform as in cockroaches, feathery as in male moths, or club-shaped as in some Diptera. The antenna is richly supplied with nerves and is covered with a battery of sense organs, including various types of mechanoreceptors and chemoreceptors. The antenna is a dead-end space, but haemolymph is circulated through it by means of a pump or heart.

Cite this article
Pick a style below, and copy the text for your bibliography.

  • MLA
  • Chicago
  • APA

"antenna." A Dictionary of Zoology. . Encyclopedia.com. 5 Nov. 2018 <https://www.encyclopedia.com>.

"antenna." A Dictionary of Zoology. . Encyclopedia.com. (November 5, 2018). https://www.encyclopedia.com/science/dictionaries-thesauruses-pictures-and-press-releases/antenna

"antenna." A Dictionary of Zoology. . Retrieved November 05, 2018 from Encyclopedia.com: https://www.encyclopedia.com/science/dictionaries-thesauruses-pictures-and-press-releases/antenna

Learn more about citation styles

Citation styles

Encyclopedia.com gives you the ability to cite reference entries and articles according to common styles from the Modern Language Association (MLA), The Chicago Manual of Style, and the American Psychological Association (APA).

Within the “Cite this article” tool, pick a style to see how all available information looks when formatted according to that style. Then, copy and paste the text into your bibliography or works cited list.

Because each style has its own formatting nuances that evolve over time and not all information is available for every reference entry or article, Encyclopedia.com cannot guarantee each citation it generates. Therefore, it’s best to use Encyclopedia.com citations as a starting point before checking the style against your school or publication’s requirements and the most-recent information available at these sites:

Modern Language Association

http://www.mla.org/style

The Chicago Manual of Style

http://www.chicagomanualofstyle.org/tools_citationguide.html

American Psychological Association

http://apastyle.apa.org/

Notes:
  • Most online reference entries and articles do not have page numbers. Therefore, that information is unavailable for most Encyclopedia.com content. However, the date of retrieval is often important. Refer to each style’s convention regarding the best way to format page numbers and retrieval dates.
  • In addition to the MLA, Chicago, and APA styles, your school, university, publication, or institution may have its own requirements for citations. Therefore, be sure to refer to those guidelines when editing your bibliography or works cited list.

antenna

antenna horn or feeler of insects. XVII. — L. antenna, prop. antemna sail-yard, used in pl. (XV) to tr. Aristotle's keraioi ‘horns’ of insects.

Cite this article
Pick a style below, and copy the text for your bibliography.

  • MLA
  • Chicago
  • APA

"antenna." The Concise Oxford Dictionary of English Etymology. . Encyclopedia.com. 5 Nov. 2018 <https://www.encyclopedia.com>.

"antenna." The Concise Oxford Dictionary of English Etymology. . Encyclopedia.com. (November 5, 2018). https://www.encyclopedia.com/humanities/dictionaries-thesauruses-pictures-and-press-releases/antenna-1

"antenna." The Concise Oxford Dictionary of English Etymology. . Retrieved November 05, 2018 from Encyclopedia.com: https://www.encyclopedia.com/humanities/dictionaries-thesauruses-pictures-and-press-releases/antenna-1

Learn more about citation styles

Citation styles

Encyclopedia.com gives you the ability to cite reference entries and articles according to common styles from the Modern Language Association (MLA), The Chicago Manual of Style, and the American Psychological Association (APA).

Within the “Cite this article” tool, pick a style to see how all available information looks when formatted according to that style. Then, copy and paste the text into your bibliography or works cited list.

Because each style has its own formatting nuances that evolve over time and not all information is available for every reference entry or article, Encyclopedia.com cannot guarantee each citation it generates. Therefore, it’s best to use Encyclopedia.com citations as a starting point before checking the style against your school or publication’s requirements and the most-recent information available at these sites:

Modern Language Association

http://www.mla.org/style

The Chicago Manual of Style

http://www.chicagomanualofstyle.org/tools_citationguide.html

American Psychological Association

http://apastyle.apa.org/

Notes:
  • Most online reference entries and articles do not have page numbers. Therefore, that information is unavailable for most Encyclopedia.com content. However, the date of retrieval is often important. Refer to each style’s convention regarding the best way to format page numbers and retrieval dates.
  • In addition to the MLA, Chicago, and APA styles, your school, university, publication, or institution may have its own requirements for citations. Therefore, be sure to refer to those guidelines when editing your bibliography or works cited list.

antenna

antenna See aerial

Cite this article
Pick a style below, and copy the text for your bibliography.

  • MLA
  • Chicago
  • APA

"antenna." World Encyclopedia. . Encyclopedia.com. 5 Nov. 2018 <https://www.encyclopedia.com>.

"antenna." World Encyclopedia. . Encyclopedia.com. (November 5, 2018). https://www.encyclopedia.com/environment/encyclopedias-almanacs-transcripts-and-maps/antenna

"antenna." World Encyclopedia. . Retrieved November 05, 2018 from Encyclopedia.com: https://www.encyclopedia.com/environment/encyclopedias-almanacs-transcripts-and-maps/antenna

Learn more about citation styles

Citation styles

Encyclopedia.com gives you the ability to cite reference entries and articles according to common styles from the Modern Language Association (MLA), The Chicago Manual of Style, and the American Psychological Association (APA).

Within the “Cite this article” tool, pick a style to see how all available information looks when formatted according to that style. Then, copy and paste the text into your bibliography or works cited list.

Because each style has its own formatting nuances that evolve over time and not all information is available for every reference entry or article, Encyclopedia.com cannot guarantee each citation it generates. Therefore, it’s best to use Encyclopedia.com citations as a starting point before checking the style against your school or publication’s requirements and the most-recent information available at these sites:

Modern Language Association

http://www.mla.org/style

The Chicago Manual of Style

http://www.chicagomanualofstyle.org/tools_citationguide.html

American Psychological Association

http://apastyle.apa.org/

Notes:
  • Most online reference entries and articles do not have page numbers. Therefore, that information is unavailable for most Encyclopedia.com content. However, the date of retrieval is often important. Refer to each style’s convention regarding the best way to format page numbers and retrieval dates.
  • In addition to the MLA, Chicago, and APA styles, your school, university, publication, or institution may have its own requirements for citations. Therefore, be sure to refer to those guidelines when editing your bibliography or works cited list.

antenna

antennaAlana, Anna, bandanna, banner, Branagh, canna, canner, Diana, fanner, Fermanagh, Guyana, Hannah, Havana, hosanna, Indiana, Joanna, lanner, Louisiana, manna, manner, manor, Montana, nana, planner, Pollyanna, Rosanna, savannah, scanner, spanner, Susanna, tanner •Abner • Jaffna • Patna • caravanner •Africana, Afrikaner, Americana, ana, banana, Botswana, bwana, cabana, caragana, Christiana, Dana, darner, Edwardiana, garner, Georgiana, Ghana, Gloriana, Guiana, gymkhana, Haryana, iguana, Lana, lantana, liana, Lipizzaner, Ljubljana, Mahayana, mana, mañana, marijuana, nirvana, Oriana, pacarana, piranha, prana, Purana, Rosh Hashana, Santayana, Setswana, sultana, Tatiana, Tijuana, Tirana, tramontana, Tswana, varna, Victoriana, zenana •Gardner • partner •antenna, Avicenna, duenna, henna, Jenna, Jenner, Morwenna, Ravenna, senna, Siena, sienna, tenner, tenor, Vienna •Edna • interregna • Etna • Pevsner

Cite this article
Pick a style below, and copy the text for your bibliography.

  • MLA
  • Chicago
  • APA

"antenna." Oxford Dictionary of Rhymes. . Encyclopedia.com. 5 Nov. 2018 <https://www.encyclopedia.com>.

"antenna." Oxford Dictionary of Rhymes. . Encyclopedia.com. (November 5, 2018). https://www.encyclopedia.com/humanities/dictionaries-thesauruses-pictures-and-press-releases/antenna

"antenna." Oxford Dictionary of Rhymes. . Retrieved November 05, 2018 from Encyclopedia.com: https://www.encyclopedia.com/humanities/dictionaries-thesauruses-pictures-and-press-releases/antenna

Learn more about citation styles

Citation styles

Encyclopedia.com gives you the ability to cite reference entries and articles according to common styles from the Modern Language Association (MLA), The Chicago Manual of Style, and the American Psychological Association (APA).

Within the “Cite this article” tool, pick a style to see how all available information looks when formatted according to that style. Then, copy and paste the text into your bibliography or works cited list.

Because each style has its own formatting nuances that evolve over time and not all information is available for every reference entry or article, Encyclopedia.com cannot guarantee each citation it generates. Therefore, it’s best to use Encyclopedia.com citations as a starting point before checking the style against your school or publication’s requirements and the most-recent information available at these sites:

Modern Language Association

http://www.mla.org/style

The Chicago Manual of Style

http://www.chicagomanualofstyle.org/tools_citationguide.html

American Psychological Association

http://apastyle.apa.org/

Notes:
  • Most online reference entries and articles do not have page numbers. Therefore, that information is unavailable for most Encyclopedia.com content. However, the date of retrieval is often important. Refer to each style’s convention regarding the best way to format page numbers and retrieval dates.
  • In addition to the MLA, Chicago, and APA styles, your school, university, publication, or institution may have its own requirements for citations. Therefore, be sure to refer to those guidelines when editing your bibliography or works cited list.

Antenna

Antenna

An antenna is a device used to transmit or receive radio waves, which are electromagnetic waves with wavelengths longer than that of infrared light. Antennas mediate between electrical signals flowing in a wire or waveguide and electromagnetic waves moving through air, water, a vacuum, or some other medium. An antenna, such as the antenna in a cell phone, can take high frequency pulses from an electrical signal generator, focus them, and launch them into space. Conversely, it can pick up waves from space, and send them to a receiver. You can think of an antenna as a soap bubble pipe: pulses (soap film) travel down the transmission line (pipe stem), reach the bowl (antenna), and are electrically shaped and pushed out into free space. The horn antennas used for microwave communication are designed to let the radiation spread out gradually rather than undergo an abrupt transition from the waveguide into free space. This is known as impedance matching.

In mechanical terms, there are basically two types of antennas: those that rotate and those that are stationary. Rotating antennas usually operate as search and detection systems. They are typically found on ships, in airports, or at weather stations. Often, an antenna will include a reflecting element to focus the radio waves, commonly parabolic or shaped something like an orange slice.

The stationary antenna type is generally found at radio or microwave transmitting sites. This antenna configuration can be a long wire between pylons, a single pylon with a long rod at the top, or a number of unevenly spaced rods like an outdoor television antenna. The satellite dish, an antenna with a parabolic reflector, is another common type of stationary configuration.

See also Radar.

Cite this article
Pick a style below, and copy the text for your bibliography.

  • MLA
  • Chicago
  • APA

"Antenna." The Gale Encyclopedia of Science. . Encyclopedia.com. 5 Nov. 2018 <https://www.encyclopedia.com>.

"Antenna." The Gale Encyclopedia of Science. . Encyclopedia.com. (November 5, 2018). https://www.encyclopedia.com/science/encyclopedias-almanacs-transcripts-and-maps/antenna

"Antenna." The Gale Encyclopedia of Science. . Retrieved November 05, 2018 from Encyclopedia.com: https://www.encyclopedia.com/science/encyclopedias-almanacs-transcripts-and-maps/antenna

Learn more about citation styles

Citation styles

Encyclopedia.com gives you the ability to cite reference entries and articles according to common styles from the Modern Language Association (MLA), The Chicago Manual of Style, and the American Psychological Association (APA).

Within the “Cite this article” tool, pick a style to see how all available information looks when formatted according to that style. Then, copy and paste the text into your bibliography or works cited list.

Because each style has its own formatting nuances that evolve over time and not all information is available for every reference entry or article, Encyclopedia.com cannot guarantee each citation it generates. Therefore, it’s best to use Encyclopedia.com citations as a starting point before checking the style against your school or publication’s requirements and the most-recent information available at these sites:

Modern Language Association

http://www.mla.org/style

The Chicago Manual of Style

http://www.chicagomanualofstyle.org/tools_citationguide.html

American Psychological Association

http://apastyle.apa.org/

Notes:
  • Most online reference entries and articles do not have page numbers. Therefore, that information is unavailable for most Encyclopedia.com content. However, the date of retrieval is often important. Refer to each style’s convention regarding the best way to format page numbers and retrieval dates.
  • In addition to the MLA, Chicago, and APA styles, your school, university, publication, or institution may have its own requirements for citations. Therefore, be sure to refer to those guidelines when editing your bibliography or works cited list.

Antenna

Antenna

An antenna is a device used to transmit and receive electromagnetic waves such as radio waves and microwaves. Antennas provide the transition between a guided wave (flowing in a wire) and a free space wave (flowing in air or vacuum ). An antenna can take high frequency pulses from an electrical signal generator , focus them, and launch them into space, like the antenna at a radio station. Conversely, it can pick up waves from space, focus them, and send them to a receiver, like the antenna on your car radio. You can think of an antenna as a soap bubble pipe: pulses (soap film) travel down the transmission line (pipe stem), reach the bowl (antenna), and are electrically shaped and pushed out into free space. The horn antennas used for microwave communication are designed to let the radiation spread out gradually rather than undergo an abrupt transition from the waveguide into free space. This is known as impedance matching, and contributes to the propagation of the radiation in the same way as cupping your hands around your mouth when shouting makes your voice travel further.

Basically there are two types of antennas: those that rotate and those that are stationary. Rotating antennas usually operate as search and detection systems. They are typically found on ships, airports, or weather stations. Often, an antenna will include a reflecting element to focus the radio waves, commonly parabolic or shaped something like an orange slice.

The stationary antenna type is generally found at radio or microwave transmitting sites. This antenna configuration can be a long wire between pylons, a single pylon with a long rod at the top, or include a number of unevenly spaced rods like an outdoor television antenna. The satellite dish, an antenna with a parabolic reflector, is another common type of stationary configuration.

See also Radar.

Cite this article
Pick a style below, and copy the text for your bibliography.

  • MLA
  • Chicago
  • APA

"Antenna." The Gale Encyclopedia of Science. . Encyclopedia.com. 5 Nov. 2018 <https://www.encyclopedia.com>.

"Antenna." The Gale Encyclopedia of Science. . Encyclopedia.com. (November 5, 2018). https://www.encyclopedia.com/science/encyclopedias-almanacs-transcripts-and-maps/antenna-0

"Antenna." The Gale Encyclopedia of Science. . Retrieved November 05, 2018 from Encyclopedia.com: https://www.encyclopedia.com/science/encyclopedias-almanacs-transcripts-and-maps/antenna-0

Learn more about citation styles

Citation styles

Encyclopedia.com gives you the ability to cite reference entries and articles according to common styles from the Modern Language Association (MLA), The Chicago Manual of Style, and the American Psychological Association (APA).

Within the “Cite this article” tool, pick a style to see how all available information looks when formatted according to that style. Then, copy and paste the text into your bibliography or works cited list.

Because each style has its own formatting nuances that evolve over time and not all information is available for every reference entry or article, Encyclopedia.com cannot guarantee each citation it generates. Therefore, it’s best to use Encyclopedia.com citations as a starting point before checking the style against your school or publication’s requirements and the most-recent information available at these sites:

Modern Language Association

http://www.mla.org/style

The Chicago Manual of Style

http://www.chicagomanualofstyle.org/tools_citationguide.html

American Psychological Association

http://apastyle.apa.org/

Notes:
  • Most online reference entries and articles do not have page numbers. Therefore, that information is unavailable for most Encyclopedia.com content. However, the date of retrieval is often important. Refer to each style’s convention regarding the best way to format page numbers and retrieval dates.
  • In addition to the MLA, Chicago, and APA styles, your school, university, publication, or institution may have its own requirements for citations. Therefore, be sure to refer to those guidelines when editing your bibliography or works cited list.