File:Collinear folded dipole antenna array.jpg
Summary
A <a href="https://en.wikipedia.org/wiki/collinear_antenna_array" class="extiw" title="w:collinear antenna array">collinear folded dipole antenna</a> on a communication tower on Lake Mountain, Utah, USA. It consists of 4 vertical <a href="https://en.wikipedia.org/wiki/folded_dipole" class="extiw" title="w:folded dipole">folded dipole</a> <a href="https://en.wikipedia.org/wiki/antenna_(radio)" class="extiw" title="w:antenna (radio)">antennas</a> in a line, fed in phase. It is an <a href="https://en.wikipedia.org/wiki/omnidirectional_antenna" class="extiw" title="w:omnidirectional antenna">omnidirectional antenna</a>, radiating equal power in all horizontal directions. The advantage of using 4 antennas is that the horizontal <a href="https://en.wikipedia.org/wiki/antenna_gain" class="extiw" title="w:antenna gain">gain</a> is increased; more of the radio power is radiated in horizontal directions and less up into the sky and down toward the earth where it is wasted. Four collinear half wave dipoles have a gain of 6 dB over a single dipole's gain of 2.15 dBi or a total of 8.15 dBi. Collinear dipole arrays like this are often used as the base station antennas for dispatchers for radio-equipped mobile services such as police, fire, ambulance, taxi, and delivery services.
Licensing
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File history
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| Date/Time | Thumbnail | Dimensions | User | Comment | |
|---|---|---|---|---|---|
| current | 06:25, 4 January 2017 | | 264 × 784 (42 KB) | 127.0.0.1 (talk) | A <a href="https://en.wikipedia.org/wiki/collinear_antenna_array" class="extiw" title="w:collinear antenna array">collinear folded dipole antenna</a> on a communication tower on Lake Mountain, Utah, USA. It consists of 4 vertical <a href="https://en.wikipedia.org/wiki/folded_dipole" class="extiw" title="w:folded dipole">folded dipole</a> <a href="https://en.wikipedia.org/wiki/antenna_(radio)" class="extiw" title="w:antenna (radio)">antennas</a> in a line, fed in phase. It is an <a href="https://en.wikipedia.org/wiki/omnidirectional_antenna" class="extiw" title="w:omnidirectional antenna">omnidirectional antenna</a>, radiating equal power in all horizontal directions. The advantage of using 4 antennas is that the horizontal <a href="https://en.wikipedia.org/wiki/antenna_gain" class="extiw" title="w:antenna gain">gain</a> is increased; more of the radio power is radiated in horizontal directions and less up into the sky and down toward the earth where it is wasted. Four collinear half wave dipoles have a gain of 6 dB over a single dipole's gain of 2.15 dBi or a total of 8.15 dBi. Collinear dipole arrays like this are often used as the base station antennas for dispatchers for radio-equipped mobile services such as police, fire, ambulance, taxi, and delivery services. |
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