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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01 Nov 2015
TL;DR: In this article, a highly complex mm-wave system-on-chip (SOC) for Ka-band active antenna arrays is presented, containing digital and mixed-signal circuits, RF-MEMS switches and four transceivers.
Abstract: A highly complex mm-wave system-on-chip (SOC) for Ka-band active antenna arrays is presented, containing digital and mixed-signal circuits, RF-MEMS switches and four transceivers. In RX mode, 13.7dB of maximum gain with −21dBm IP1dB were obtained, in TX mode, 11dB of maximum gain with −2dBm OP1dB. A total of 65536 amplitude and phase states can be set. The IC has a total power consumption of 222mW in RX and 337mW in TX mode and occupies 4×3.85mm2.
9 citations
TL;DR: The Radar SAIL concept is based on the use of a rectangular antenna lying in the dawn-dusk orbital plane with the length along speed vector smaller than the height as mentioned in this paper.
9 citations
Patent•
05 Jun 1997
TL;DR: In this paper, 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, including 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.
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.
9 citations
Patent•
22 Mar 2004TL;DR: In this paper, a plasma immersion ion implant apparatus and method, and a plasma chamber, each configured to provide a uniform ion flux and to dissipate the effects of secondary electrons are disclosed.
Abstract: A plasma immersion ion implant apparatus and method, and a plasma chamber, each configured to provide a uniform ion flux and to dissipate the effects of secondary electrons are disclosed. The invention includes a plasma chamber including a dielectric tophat configuration and a conductive top section that may be liquid cooled. In addition, the invention provides a radio frequency (RF) antenna configuration including an active antenna that is coupled to an RF source and a parasitic antenna that is not directly coupled to any RF source, but may be grounded. The RF antenna allows for tuning of the RF coupling.
9 citations
TL;DR: In this paper, an active phased array antenna which can scan its beam direction to a wide range of scan angles is presented, which can transmit high data rate signal from satellite to ground stations; and by spatial power combining the needed Effective Isotropic Radiated Power (EIRP) for the transmission link will be provided.
Abstract: An active phased array antenna which can scan its beam direction to a wide range of scan angles is presented in this paper. The paper proposes a new technique to compact a phased array antenna and making it suitable for applying in satellite payloads. This antenna should transmit high data rate signal from satellite to ground stations; and by spatial power combining the needed Effective Isotropic Radiated Power (EIRP) for the transmission link will be provided. The main beam can be scanned to 50° from normal. Polarization of the radiated wave of this antenna is circular. The designed antenna benefits from microstrip technology and has a unique low mass multilayer structure with two different substrates. For implementing antenna’s RF circuits, Microwave Monolithic Integrated Circuits (MMICs) have been used and they are integrated expertly with microstrip radiators. Beam controller board sends necessary commands to MMICs for setting phase and amplitude of each array module. For decreasing side lobe level in high scan angles, genetic algorithm is applied and excitations of array elements are optimized. Design stages and simulation results of the array antenna are summarized in this paper and the results are compared with test results.
9 citations