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An antenna rotator (or antenna rotor) is a device used to change the orientation, within the horizontal plane, of a directional antenna. Most antenna rotators have two parts, the rotator unit and the controller. The controller is normally placed near the equipment which the antenna is connected to, while the rotator is mounted on the antenna ...
An antenna tuner, a matchbox, transmatch, antenna tuning unit (ATU), antenna coupler, or feedline coupler is a device connected between a radio transmitter or receiver and its antenna to improve power transfer between them by matching the impedance of the radio to the antenna's feedline. Antenna tuners are particularly important for use with ...
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Western Electric Co., Inc. was an American electrical engineering and manufacturing company that operated from 1869 to 1996. A subsidiary of the AT&T Corporation for most of its lifespan, Western Electric was the primary manufacturer, supplier, and purchasing agent for all telephone equipment for the Bell System from 1881 until 1984, when the Bell System was dismantled.
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. This method achieves 3D beam steering by employing compact structures that allow wide-angle control over both elevation and azimuth, proving highly effective for systems ...
The automatic kind will also lower when the ignition switch is turned off. Unlike most car antennas adjusted directly by hand, power antennas retract completely beneath the surface that they are mounted on. This convenience could be found on most luxury cars by the late-1950s. The automatic power antenna became much more common in the 1970s. [1]
Radiotriangulation scheme using two direction-finding antennas (A and B) Direction finding antenna near the city of Lucerne, Switzerland Direction finding (DF), or radio direction finding (RDF), is the use of radio waves to determine the direction to a radio source.
Where radio transmitters and receivers share one antenna, often a coaxial relay is used as a TR (transmit-receive) relay, which switches the antenna from the receiver to the transmitter. This protects the receiver from the high power of the transmitter. Such relays are often used in transceivers which combine transmitter and receiver in one ...