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Combined with a signal increase of 14 dB due to height and 11 dB due to lack of attenuating building walls, an outdoor antenna can result in a signal strength increase of up to 40 dB at the TV receiver. [6] Outdoor antenna designs are often based on the Yagi–Uda antenna [16] or log-periodic dipole array (LPDA). [17]
The first full scale beam waveguide antenna was the 64 meter antenna at the Usuda Deep Space Center, Japan, built in 1984 by the Japan Aerospace Exploration Agency. [6] After the Jet Propulsion Lab (JPL) tested this antenna and found it better than their conventional 64-meter antennas, [ 7 ] they too switched to this method of construction for ...
These designs serve as high-gain, planar alternatives with advantages in cost, efficiency, and scalability, meeting modern requirements for compact and lightweight systems. One of the latest approaches in beam steering involves Near-Field Meta-Steering (NFMS), [ 6 ] which uses phase-gradient metasurfaces placed in close proximity to a feed antenna.
An antenna array (or array antenna) is a set of multiple connected antennas which work together as a single antenna, to transmit or receive radio waves. [ 1 ] : p.149 [ 2 ] The individual antennas (called elements ) are usually connected to a single receiver or transmitter by feedlines that feed the power to the elements in a specific phase ...
A portable speaker which marks the lower end of the size range of Bluetooth speakers constructed primarily for the reproduction of music. Wireless speakers use rechargeable batteries to power them. Almost all wireless speakers operate on rechargeable batteries that are not replaceable, so that the lifespan of these speakers is that of their ...
Tuner - A high fidelity AM/FM radio receiver in a component home audio system. It has no speakers but outputs an audio signal which is fed into the system and played through the system's speakers. Portable radio - a radio powered by batteries that can be carried with a person.
Nick Saban says there's "no reason" college football coaches can't directly tell the quarterback what play to run. (Photo by Kevin C. Cox/Getty Images) (Kevin C. Cox via Getty Images)
Small rhombic UHF television antenna from 1952. Its broad bandwidth allowed it to cover the 470 to 890 MHz UHF television band. A rhombic antenna is made of four sections of wire suspended parallel to the ground in a diamond or "rhombus" shape. Each of the four sides is the same length – about a quarter-wavelength to one wavelength per ...