what are antennas mean
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antenna antenna. 1  a conductor by which electromagnetic waves are sent out or received, consisting commonly of a wire or set of wires; aerial. 2  Zoology. one of the jointed, movable, sensory appendages occurring in pairs on the heads of insects and most other arthropods.
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- Adj. 1. antennary-of or relating to antennae; antennal senses of insects.antennal.1  Facebook.dj. 1. antennary-of or relating to antennae; antennal senses of insects.
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- Phased array is an array of antennas in which the relative phases of the respective signals feeding the antennas are varied in such a way that the effective radiation pattern of the array is reinforced in a desired direction and suppressed in undesired directions.
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antennae noun. 1  The definition of antennae are wires that receive and conduct electromagnetic waves, typically to transmit information. 2  In zoology, antennae are defined as the long pair of appendages on the head of an arthropod which are used to sense the environment.
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Biological Effects A dipole is a straight, center-fed antenna that is normally a little less than a half-wavelength long. You are wide because even a very thin person is wide compared to a metal rod. You are “lossy” because the impedance of the human body is much higher than a metal rod. In other words, your body has more internal resistance to the flow of RF energy than a highly conductive metal road.
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antenna antenna n. 1640s, feeler or horn of an insect, from Latin antenna sail yard, the long yard that sticks up on some sails, of unknown origin, perhaps from PIE root *temp-to stretch, extend. In the etymological sense, it is a loan-translation of Aristotle's Greek keraiai horns (of insects).
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No Such Thing as an HDTV Antenna There is nothing specific about a TV antenna that is used to receive HD signals. Your antenna doesn't really care whether the signal is high definition or not. It has absolutely no idea what the signal resolution is, or whether the signal is analog or digital.ntenna is a piece of metal designed to resonate at a specific frequency and to be responsive over a range of frequencies. TV antennas are designed to work either in the range of Ultra High Frequencies (UHF), Very High Frequencies (VHF) or both.
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Antenna gain Antenna gain is usually defined as the ratio of the power produced by the antenna from a far-field source on the antenna's beam axis to the power produced by a hypothetical lossless isotropic antenna, which is equally sensitive to signals from all directions.
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- A patch antenna (also known as a rectangular microstrip antenna) is a type of radio antenna with a low profile, which can be mounted on a flat surface.It consists of a flat rectangular sheet or patch of metal, mounted over a larger sheet of metal called a ground plane.he impedance bandwidth of a patch antenna is strongly influenced by the spacing between the patch and the ground plane. As the patch is moved closer to the ground plane, less energy is radiated and more energy is stored in the patch capacitance and inductance: that is, the quality factor Q of the antenna increases.
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- In electronics and telecommunications a transmitter or radio transmitter is an electronic device which generates a radio frequency alternating current. When a connected antenna is excited by this alternating current, the antenna emits radio waves.
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Matching Transformers, Baluns, and Chokes Balun is a contraction of two words, Balanced and Unbalanced, and it refers to the type of antenna to the type of feed-line. An example of a balanced antenna is the full-wave loop and the dipole, the bowtie antenna.An example of an unbalanced antenna is the long wire antenna, or even a non-center fed dipole antenna.alun is a contraction of two words, Balanced and Unbalanced, and it refers to the type of antenna to the type of feed-line. An example of a balanced antenna is the full-wave loop and the dipole, the bowtie antenna. An example of an unbalanced antenna is the long wire antenna, or even a non-center fed dipole antenna.
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- Definition of antenna - either of a pair of long, thin sensory appendages on the heads of insects, crustaceans, and some other arthropods, a rod, wire, or Definition of antenna - either of a pair of long, thin sensory appendages on the heads of insects, crustaceans, and some other arthropods, a rod, wire, or dictionary thesaurus
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Polarization - EM Waves and Antennas The polarization of an antenna is the polarization of the radiated fields produced by an antenna, evaluated in the far field. Hence, antennas are often classified as Linearly Polarized or a Right Hand Circularly Polarized Antenna. This simple concept is important for antenna to antenna communication.f one antenna is vertically polarized and the other is horizontally polarized, the angle is 90 degrees and no power will be transferred. As a side note, this explains why moving the cell phone on your head to a different angle can sometimes increase reception.
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satellite In general, a satellite is anything that orbits something else, as, for example, the moon orbits the earth. In a communications context, a satellite is a specialized wireless receiver/transmitter that is launched by a rocket and placed in orbit around the earth. There are hundreds of satellites currently in operation.n a communications context, a satellite is a specialized wireless receiver/transmitter that is launched by a rocket and placed in orbit around the earth. There are hundreds of satellites currently in operation.
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- Antenna types Omni directional antennas Omni directional antennas have a radiation pattern that is donut shaped with the antenna at the center of the donut. This means that with the antenna oriented vertically, the signal coverage is equal in all directions in the horizontal plane.ntenna types Omni directional antennas Omni directional antennas have a radiation pattern that is donut shaped with the antenna at the center of the donut. This means that with the antenna oriented vertically, the signal coverage is equal in all directions in the horizontal plane.
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No Such Thing as an HDTV Antenna TV antennas are designed to work either in the range of Ultra High Frequencies (UHF), Very High Frequencies (VHF) or both. Any station transmitting within an antenna bandwidth, i.e. the VHF/UHF frequency range, can be picked up by the antenna and transferred to the TV set.
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- The antennae on your television set receive the signal, in the form of electromagnetic waves, that is broadcasted from the television station. It is displayed on your television screen. Cable companies have antennae or dishes which receive waves broadcasted from your local TV stations.
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What do you call a baby raccoon? Ursus lotor Linnaeus, 1758. The raccoon (/rəˈkuːn/ or US /ræˈkuːn/, Procyon lotor), sometimes spelled racoon, also known as the common raccoon, North American raccoon, northern raccoon and colloquially as coon, is a medium-sized mammal native to North America.
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Antenna Patterns and Their Meaning Antenna patterns are frequently shown normalized to the peak gain. The peak gain (in dBi) is simply subtracted from the gain at all the points on the curve and the pattern is plotted with the new values. These patterns are expressed in dB with 0 dB corresponding to the peak gain.
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- Gain has a positive value, loss has a negative value, and is equal to. 10*log(Pout/Pin). Antenna Gain: The relative increase in radiation at the maximum point expressed as a value in dB above a standard, in this case the basic antenna, a ½-wavelength dipole (as in Two-Poles) by which all other antennas are measured. The reference is known as 0dBD (zero decibel referenced to dipole).
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satellite In general, a satellite is anything that orbits something else, as, for example, the moon orbits the earth. In a communications context, a satellite is a specialized wireless receiver/transmitter that is launched by a rocket and placed in orbit around the earth. There are hundreds of satellites currently in operation. low-earth-orbit (LEO) satellite system employs a large fleet of birds, each in a circular orbit at a constant altitude of a few hundred miles. The orbits take the satellites over, or nearly over, the geographic poles. Each revolution takes approximately 90 minutes to a few hours.
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Antennas and transmitters Antennas like this are sometimes called receivers. A transmitter is a different kind of antenna that does the opposite job to a receiver: it turns electrical signals into radio waves so they can travel sometimes thousands of kilometers around the Earth or even into space and back.rtwork: How a wave travels from a transmitter to a receiver: 1) By line of sight; 2) By ground wave; 3) Via the ionosphere. Photo: This telescopic FM radio antenna pulls out to a length of about 1-2m (3-6ft or so), which is roughly half the length of the radio waves it's trying to capture.
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Omni Antenna vs. Directional Antenna Gain is the amount of increase in energy that an antenna adds to a radio frequency (RF) signal. Direction is the shape of the transmission pattern. As the gain of a directional antenna increases, the angle of radiation usually decreases. This provides a greater coverage distance, but with a reduced coverage angle. The coverage area or radiation pattern is measured in degrees.
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wireless Wireless is a term used to describe telecommunications in which electromagnetic waves (rather than some form of wire) carry the signal over part or all of the communication path.
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The Ultimate Digital TV Antenna Guide Directional TV antennas are antennas designed to pick up signals in the direction you point them. Omni-directional antennas are designed to pick up channels in all directions. This tradeoff off is done by focusing the antenna gain, which is different from amplifier gain.
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- They also carry signals for your television and cellular phones. The antennae on your television set receive the signal, in the form of electromagnetic waves, that is broadcasted from the television station. Cable companies have antennae or dishes which receive waves broadcasted from your local TV stations.