Topic
Active antenna
About: Active antenna is a research topic. Over the lifetime, 2246 publications have been published within this topic receiving 26493 citations.
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08 Dec 1996TL;DR: A new sensing scheme for 3D active antenna that can detect not only the contact location between an insensitive flexible beam and an object but also the normal direction of the object's surface where the beam makes contact is discussed.
Abstract: This paper discusses a new sensing scheme for 3D active antenna that can detect not only the contact location between an insensitive flexible beam and an object but also the normal direction of the object's surface where the beam makes contact. The active antenna is simply composed of an insensitive flexible beam, actuators to move the beam, position sensors to measure the rotational angle of the beam, and a moment sensor. In our former work (Kaneko and Kanayama, 1995), we have shown that both the normal direction and the contact distance can be obtained by more than three times pushing motions. Through the mathematical formulation between the pushing geometry and the contact force, we newly find that both the normal direction and the contact distance can be determined by just one time pushing motion, even though a lateral slip between the beam and an object appears during the pushing motion. We further verify the working principle by experiments.
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27 Dec 2004
TL;DR: The development status of an L-band synthetic aperture radar (SAR) antenna demonstrator undertaken by an industrial consortium under contract to the European Space Agency (ESA) is outlined.
Abstract: This paper outlines the development status of an L-band synthetic aperture radar (SAR) antenna demonstrator undertaken by an industrial consortium under contract to the European Space Agency (ESA). Its aim is to verify the technology and the satisfactory performance of the SAR active antenna in advance of the development of the full L-band SAR instrument
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28 Aug 2019TL;DR: A wideband active antenna system comprising an antenna having N outputs and a nominal bandwidth, each of the outputs being directly coupled to an associated buffer amplifier, with a distance between the outputs and the first active stage of each buffer amplifier preferably being maintained as short as reasonably possible and preferably no greater than ¼ wavelength of any transmission and/or receiving frequency in an extension band of frequencies lower than a lowest frequency in the nominal bandwidth of the antenna.
Abstract: A wideband active antenna system comprising an antenna having N outputs and a nominal bandwidth, each of the N outputs being directly coupled to an associated buffer amplifier, with a distance between the N outputs and a first active stage of each associated buffer amplifier preferably being maintained as short as reasonably possible and preferably no greater than ¼ wavelength of any transmission and/or receiving frequency of the wideband active antenna system and/or preferably no greater than 0.1 wavelength of any transmission and/or receiving frequency in an extension band of frequencies lower than a lowest frequency in the nominal bandwidth of the antenna.
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15 Apr 2020
TL;DR: In this paper, a 3D MIMO-based radio transmission method is proposed to establish a communication connection between a base station pre-configured with an active antenna array and a user equipment terminal.
Abstract: A 3D MIMO based radio transmission method, comprising: establishing a communication connection between a base station pre-configured with an active antenna array and a user equipment terminal, and establishing a 3D MIMO channel model; when some active antennas in the active antenna array have failed, automatically reconfiguring the active antenna array to realise redundancy; and generating a 3D pre-coded matrix through the 3D MIMO channel model, so as to form a beam forming vector having a high resolution in two dimensions and obtain a multi-user multiplexing gain.
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23 Aug 2019
TL;DR: In this paper, the authors discuss wireless communication systems, including, antenna systems and related methods, which are each directed to utilizing one or more multi-mode antennas for the purpose of varying a radiation pattern characteristic thereof to enhance network security and communication link between an access point and one/more client devices on a network.
Abstract: The disclosure concerns wireless communication systems, including, antenna systems and related methods, which are each directed to utilizing one or more multi-mode antennas for the purpose of varying a radiation pattern characteristic thereof to enhance network security and communication link between an access point and one or more client devices on a network.