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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Patent•
22 Jul 2015TL;DR: In this paper, an active antenna system (AAS) operated as a static AAS is used to generate a static beam from signals applied to its input and based on received AAS configuration information.
Abstract: An Active Antenna System (AAS) operated as a static AAS is used to generate a static beam from signals applied to its input and based on received AAS configuration information. The AAS configuration information is received by a processor coupled to all of the components of the AAS and said processor converts the received AAS configuration information to control signals causing said components to generate the static beam.
13 citations
Patent•
03 Feb 1997
Abstract: A magnetic field sensor which can be used as an active antenna is disclosed that is capable of small size, ultrawideband operation, and high efficiency. The sensor includes a multiplicity of magnetic field transducers, e.g., superconducting quantum interference devices (SQUIDs) or Mach-Zehnder modulators, that are electrically coupled in a serial array. Dummy SQUIDs may be used about the perimeter of the SQUID array, and electrically coupled to the active SQUIDs for eliminating edge effects that otherwise would occur because of the currents that flow within the SQUIDs. Either a magnetic flux transformer which collects the magnetic flux and distributes the flux to the transducers or a feedback assembly (bias circuit) or both may be used for increasing the sensitivity and linear dynamic range of the antenna.
13 citations
Patent•
13 Aug 2014
TL;DR: In this paper, a first set of independently switchable radio-frequency reflectors are positioned around at least the first active antenna element, and these first switchable reflectors enable controlled perturbation of the communication channel between the antenna assembly and a remote communications node.
Abstract: An antenna assembly includes a first active antenna element and a second active antenna element, each of which may be a dipole. A first set of independently-switchable radio-frequency reflectors are positioned around at least the first active antenna element. These first switchable radio-frequency reflectors may also be positioned around the second active antenna element. Alternatively, a second set of independently-switchable radio-frequency reflectors may be positioned around the second active antenna element. The switchable reflectors enable controlled perturbation of the communication channel between the antenna assembly and a remote communications node, enabling securely encrypted communications.
13 citations
Patent•
05 Dec 1996TL;DR: In this paper, a rotation detector is used to detect a rotation relative to a fixed reference plane of a portion of the antenna tower proximate the active antenna and develops a sway signal indicative thereof.
Abstract: For use with an antenna tower, the antenna tower providing a mount for an active antenna that is subject to misdirection when the antenna tower sways, a system for, and method of, dynamically counteracting sway in the antenna tower. The system includes: (1) a rotation detector that senses a rotation, relative to a fixed reference plane, of a portion of the antenna tower proximate the active antenna and develops a sway signal indicative thereof and (2) antenna beam steering logic, coupled to the rotation detector, that receives the sway signal and modifies a drive signal provided to elements of the active antenna to redirect a beam projecting therefrom, the drive signal thereby compensated for the rotation to counteract the sway in the antenna tower. The system may form a portion of a wireless communications station.
13 citations
TL;DR: In this article, an easily manufactured, reduced-size, active receiving antenna for automotive applications, which increases short-range wireless detection in the 315-MHz band, is described.
Abstract: This paper describes an easily manufactured, reduced-size, active receiving antenna for automotive applications, which increases short-range wireless detection in the 315-MHz band. This compact antenna has an advantage over currently available antennas because can be hidden in a vehicle's interior. The active antenna consists of a low-noise amplifier coupled to a low-profile planer meander-line pattern printed on the dielectric substrate. Experimental verification of the antenna performance and a theoretical calculation for the maximum range of the active antenna are presented. © 2004 Wiley Periodicals, Inc. Microwave Opt Technol Lett 43: 293–297, 2004; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.20448
13 citations