An antenna is a electromagnetic transition between a circuit and the medium around it. For instance, cell phones have an antenna that radiates energy towards the tower, allowing you to talk. Radios have antennas that absorb energy, literally grabbing the signal, and hence the music, out of thin air. A physicist might describe an antenna as a device that transitions from the electrons flowing in a circuit to photons traveling through the air. Engineers view antennas as filters in both space and frequency, since antennas are only looking in certain angular regions over certain bandwidths. No antenna is perfectly isotropic, and no antenna works over all frequencies. Thus, the proper selection of an antenna for each application is very important.
Thursday, December 27, 2007
What is an antenna?
Though I suppose this post will be the least useful for anyone who is already on this site, nonetheless, I feel the need to discuss what it is that an antenna actually does...
An antenna is a electromagnetic transition between a circuit and the medium around it. For instance, cell phones have an antenna that radiates energy towards the tower, allowing you to talk. Radios have antennas that absorb energy, literally grabbing the signal, and hence the music, out of thin air. A physicist might describe an antenna as a device that transitions from the electrons flowing in a circuit to photons traveling through the air. Engineers view antennas as filters in both space and frequency, since antennas are only looking in certain angular regions over certain bandwidths. No antenna is perfectly isotropic, and no antenna works over all frequencies. Thus, the proper selection of an antenna for each application is very important.
An antenna is a electromagnetic transition between a circuit and the medium around it. For instance, cell phones have an antenna that radiates energy towards the tower, allowing you to talk. Radios have antennas that absorb energy, literally grabbing the signal, and hence the music, out of thin air. A physicist might describe an antenna as a device that transitions from the electrons flowing in a circuit to photons traveling through the air. Engineers view antennas as filters in both space and frequency, since antennas are only looking in certain angular regions over certain bandwidths. No antenna is perfectly isotropic, and no antenna works over all frequencies. Thus, the proper selection of an antenna for each application is very important.
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2 comments:
Awesome! No words. You always go one step beyond.
There is so much great, useful information here. Thank you! Thank you! Thank you!
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Nice Article. Use full information. Thanks for sharing and keep posting...
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