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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
02 Jan 2013
TL;DR: In this paper, a test method and a test apparatus of a radio frequency index of an active antenna system is presented. But the test method is not suitable for the case of a single antenna, and the test environment is not the same as the near field coupling testing environment.
Abstract: The invention discloses a test method and a test apparatus of a radio frequency index of an active antenna system. A tested active antenna system is placed in a testing cover to be subjected to radio frequency index testing, and the test cover comprises an antenna array part and an inactive network part, wherein antenna feeder parts of the antenna array part and the inactive network part are the same. The test method comprises the following steps of: monomer calibration of the testing cover: calibrating the differential loss and the phase offset generated by the testing cover; near-field coupling calibration: calibrating a near-field coupling testing environment of the testing cover by two testing covers subjected to the monomer calibration; and radio frequency index testing: placing the tested active antenna system in the calibrated testing cover to form a near-field coupling manner with the calibrated testing cover, the testing environment is the same with the near-field coupling testing environment, carrying out radio frequency index testing on the tested active antenna system by a radio frequency testing interface on the testing cover after compensating the testing environment by adopting the obtained calibration result, and obtaining the radio frequency index of a radio frequency port of the active antenna system.

5 citations

Patent
01 Jul 2015
TL;DR: In this paper, a CSI measurement and feedback method was proposed for the problem of high air interface overhead needed by CSI feedback of an AAS (Active Antenna System) in one embodiment, UE (User Equipment) receives a first reference signal to obtain an API, and receives a second reference signal for obtaining an RI (Rank Indicator) and a PMI (Precoding Matrix Indicator).
Abstract: The invention provides a CSI (Channel Status Indicator) measurement and feedback method specific to the problem of high air interface overhead needed by CSI feedback of an AAS (Active Antenna System) In one embodiment, UE (User Equipment) receives a first reference signal to obtain an API, and receives a second reference signal to obtain an RI (Rank Indicator) and a PMI (Precoding Matrix Indicator); and the calculation of a corresponding CQI (Channel Quality Indicator) is based on the inclination angle of an antenna port indicated by the API and a precoding matrix indicated by the PMI in a base station Through adoption of the CSI measurement and feedback method, the air interface feedback overhead is reduced, and the overhead of a reference signal needed by downlink measurement is also reduced

5 citations

Patent
21 Sep 2018
TL;DR: In this article, a broadband low-minor-lobe analog multi-beam array reconnaissance system comprises a broadband active antenna array, a Rotman lens network, a beam selection switch, a broadband digital receiver, a signal processing unit.
Abstract: A broadband low-minor-lobe analog multi-beam array reconnaissance system comprises a broadband active antenna array, a Rotman lens network, a beam selection switch, a broadband digital receiver, a signal processing unit. The broadband active antenna array is connected with an analog multi-beam network. The Rotman lens network is configured to form multiple beams simultaneously in a large instantaneous bandwidth. Further, by assigning corresponding amplitude and phase weights to respective amplitude-phase weighting modules of the antenna array, the beam selection switch performs radio frequencyselection in multiple beams according to a control command and sends a selected signal to the broadband digital receiver. The digital receiver processes the data from multiple beams and frequency bands in parallel, and performs parameter measurement on the data to form a radar pulse descriptor and sends the radar pulse descriptor to the signal processing unit. The signal processing unit processesthe signal to form a radar descriptor. The system achieves high sensitivity, wide frequency-domain coverage, wide airspace coverage, flexible beam scheduling and good complex electromagnetic environment adaptability.

5 citations

Proceedings ArticleDOI
29 Dec 2011
TL;DR: In this article, a tuneable antenna, including a varactor diode placed at specific position over the radiating slot, was fabricated and tested over several targeted frequency bands (centred at 1.7, 1.8, 19 and 2.04 GHz) and their harmonics.
Abstract: A design procedure for reconfigurable mobile antenna module is presented. A tuneable antenna, including a varactor diode placed at specific position over the radiating slot, was fabricated and tested over several targeted frequency bands (centred at 1.7, 1.8, 1.9 and 2.04 GHz) and their harmonics. A limitation of the tuneable antenna is its non-linear behaviour at the transmitter. A method to measure the radiated power from an active antenna (AA) at fundamental and harmonic frequencies is introduced to suppress the harmonic radiations of the active antenna. The experimental results on the received power show a very good capability for harmonic suppression.

5 citations

Patent
16 Mar 2007
TL;DR: In this article, an active antenna capable of transmitting and receiving a wireless signal of a low frequency band and a mobile communication terminal having the active antenna, is provided, which includes an antenna element which transmits and receives wireless signal, a filter which filters the wireless signal being received at the antenna element, and an amplifier which amplifies the wireless signals being passed through the filter.
Abstract: An active antenna capable of transmitting and receiving a wireless signal of a low frequency band and a mobile communication terminal having the active antenna, are provided. The active antenna includes an antenna element which transmits and receives a wireless signal, a filter which filters the wireless signal being received at the antenna element such that a wireless signal belonging to a frequency band lower than the operating frequency of the antenna element is passed, and an amplifier which amplifies the wireless signal being passed through the filter. As a result, the size of the antenna can be greatly reduced, by the use of an active antenna which receives wireless signals of low frequency bands. Additionally, a more compact mobile communication terminal can be provided, because wireless signal of both high frequency bands and low frequency bands can be transmitted and received at one antenna.

5 citations


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Performance
Metrics
No. of papers in the topic in previous years
YearPapers
202148
2020113
2019123
201898
201789
2016102