Active antenna

About: Active antenna is a research topic. Over the lifetime, 2246 publications have been published within this topic receiving 26493 citations.

Antenna Structure With Reconfigurable Pattern And Manufacturing Method Thereof

Abstract: The invention provides an antenna structure with reconfigurable pattern, which comprises a grounded plane, at least an active antenna electrically connected to an RF signal source, at least a current dragger electrically connected to the grounded plane, and a controller. The at least an active antenna and the at least a current dragger are distributed on or near the grounded plane. The controller disables or enables the at least a current dragger at an operating frequency band to switch the RF current applied to the grounded plane to flow into or against the at least a current dragger, thereby a plurality of radiation patterns may be configured.

Slot antenna for frequency switchable active antenna

Abstract: Annular slot antenna having dual port and dual band which is suitable for use in the feed-back path of an oscillator resulting in an active antenna configuration by using the modern MIC and MMIC fabrication technology, compact light weight, and low cost active antenna are realized The proposed antenna is designed to radiate and transmit equal amounts of power The return loss of the proposed antenna is higher than that desired for one-port antenna application at the desired dual-band frequencies The antenna is fabricated on one side of a Neltec substrate (∊ r =33 and thickness = 0762 mm) and the microstrip feeding line is fabricated on the opposite side of the board The antenna was designed to operate at WLAN bands centered at 24 and 52GHz The simulated and measured results show fairly good agreement The measured return losses were found 205 dB at 24 GHz and 139 dB at 52GHz while simulated return losses were 936 dB at 24 GHz and 3135 dB at 52 GHz The radiation pattern is approximately omnidirectional at both frequencies in H-plane

High-efficiency class-B push¿pull amplifying array for microwave transmitting front end

Abstract: The authors present a novel push–pull amplifying array using quadruple antenna-patch couplers and dual-feed antennas. It exploits the advantages of both class-B push–pull amplifiers and active integrated antennas (AIAs), resulting in a high-efficiency, linear and yet compact design. A state-of-the-art heterojunction FET power amplifier of 50% peak power-added efficiency (PAE) is achieved at 10 GHz. A three-element array prototype was successfully built, achieving a peak antenna gain of 19.6 dBi. This is 5.7 and 10.4 dB better than amplifying arrays using the antenna-patch coupler approach and the conventional parallel feeding network, respectively.

Active antenna calibration

Abstract: Aspects of this disclosure relate to active antenna calibration In some embodiments, a local oscillator signal can be injected into the receive path for misalignment measurement and calibration of the receive path, a transmit signal from a transmit path can be coupled to a receive path, and the transmit path can be calibrated relative to the receive path

RF electromagnetic field levels extensive geographical monitoring in 5G scenarios: dynamic and standard measurements comparison

Abstract: The document presents a potentially innovative methodology for carrying out large-scale measurements of radiofrequency electromagnetic field. The system consists in performing dynamic measurements using a control unit equipped with the appropriate probes positioned on the roof of a car moving along the territory. Aim of the work is to provide a methodology to assess field strength variability which characterize future 5G scenarios with a combination of measurements carried out in a dynamic way in comparison with the static measurement approach which is commonly adopted for environmental impact assessment. The possibility to perform massive measurements in a short time could become extremely useful in the next future to evaluate electromagnetic field levels, when the implementation of the new 5G services will lead to an increased complexity in the use of the spectrum and new antenna systems (Active Antenna Systems).