Topic
Active antenna
About: Active antenna is a research topic. Over the lifetime, 2246 publications have been published within this topic receiving 26493 citations.
Papers published on a yearly basis
Papers
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16 Apr 2001
TL;DR: In this paper, a structure of a mobile active antenna system and a satellite tracking method using the same are provided to enhance tracking accuracy, reduce tracking loss, and accurately track. But the structure of the system is not described.
Abstract: PURPOSE: A structure of a mobile active antenna system and a satellite tracking method using the same are provided to enhance tracking accuracy, reduce tracking loss, and accurately track. CONSTITUTION: A structure of a mobile active antenna system comprises an antenna radome part(51) and an active antenna signal processing part(52). The antenna radome part(51) includes four groups of m active channel parents(511,512,513,514), four signal power combiners(515,516,517,518), a beam forming block(519), a rotating power(520), a tracking signal converter(521), a beam orientation controller(522), a rotation platform(530), a rotary jointer(523), a frequency converter(524) and a driving controller(528). The active antenna signal processing part(52) includes a satellite tracking processor(527), an electronic direction sensor(526), and a power module(525). The active channel parents includes radiating array, first low noise amplifiers, a signal power combiner, a second low noise amplifier, a phase shifter, a phase shifter drive, and a signal power attenuator. The beam forming block(519) includes four low noise amplifiers, four phase shifter, four phase shifter drive, and tow signal power combiner.
1 citations
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01 Dec 1989TL;DR: Simmons and Bodnar as discussed by the authors published three short articles concerning the definition of the gain of active antenna systems and planar arrays and solicited input from M -S regarding the gain o d active antenna s stems, as a result of discussions at an Antenna StandYards Committee meeting during the San Jose symposium.
Abstract: [Editor's note: Three short articles concerning the definition of the gain of active antenna systems and planar arrays appeared on pages 62-64 of the October, 1989, Newsletter. The following comments were solicited by Antoine Roederer as a part of the questions he raised in the October issue, but unfortunately arrived a few da s too late to include in that issue. Alan J. Simmons ($0 Box 103, Winchester, MA 01890) and Donald G. Bodnar (GTRI/CCRF/STL/ATD-Room 4-138, Georgia Institute of Technology, Atlanta, GA 30332 also solicited input from M - S regarding the gain o d active antenna s stems, as a result of discussions at an Antenna StandYards Committee meeting during the San Jose symposium. This later input was sollcited on behalf of the Committee. Those wishing to contribute to this discussion are requested to send their comments to the appropriate author, with copies to Alan Simmons or Donald Bodnar, who will act as coordinators for these discussions. WRS]
1 citations
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04 Jan 2019
TL;DR: In this paper, a beam-steerable antenna array for centimeterwave and millimeter-wave mobile terminals was proposed. But the antenna array had a steerable beam without phase shifters.
Abstract: Devices, systems, and methods for a compact beam-steerable antenna array for centimeter-wave and millimeter-wave mobile terminals, the antenna array having a steerable beam without phase shifters. In some embodiments, an antenna array includes an active antenna element and at least one parasitic element spaced apart from the active antenna element. An impedance between each of the at least one parasitic element and a ground element is tunable to steer a signal beam at the active antenna element in a desired direction.
1 citations
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01 Jun 2016
TL;DR: In this paper, an antenna device for a beam space MIMO system is proposed, which consists of a power feeding unit for providing RF signals; a reactance control unit for controlling the value of reactance; an active antenna element, connected to the power feed point, for receiving the RF signals from the power unit; at least one pair of parasitic antenna elements of which the reactance values are controlled by the reaction control unit; and a substrate where the parasitic antennas and active antenna elements are formed.
Abstract: The present invention relates to an antenna device for a beam space MIMO system. The present invention comprises: a power feeding unit for providing RF signals; a reactance control unit for controlling the value of reactance; an active antenna element, connected to the power feeding unit via a power feeding point, for receiving the RF signals from the power feeding unit; at least one pair of parasitic antenna elements of which the reactance values are controlled by the reactance control unit; and a substrate where the parasitic antenna elements and active antenna element are formed. According to the disclosed specification, the antenna device for a beam space MIMO system is capable of performing as much as MIMO by RF front-end less than the existing MIMO by securing multiple radiation patterns with low interference in a limited space, thereby realizing low complexity and low power and minimizing a communication device.
1 citations
01 Mar 1992
TL;DR: The effective area of search coil increased Input impedance presented by operational amplifier and associated components nearly balances out impedance of search coils Fluctuations in ambient magnetic field induce large currents in search coil as mentioned in this paper.
Abstract: Effective area of search coil increased Input impedance presented by operational amplifier and associated components nearly balances out impedance of search coil Fluctuations in ambient magnetic field induce large currents in search coil
1 citations