Topic
Active antenna
About: Active antenna is a research topic. Over the lifetime, 2246 publications have been published within this topic receiving 26493 citations.
Papers published on a yearly basis
Papers
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01 Jan 2011
TL;DR: In this article, test results from a 25-element active antenna prototype array operating in the frequency range of 10-70 MHz are presented to demonstrate the high effectiveness of the system due to the Galactic background limited sensitivity and high dynamic range of the antenna amplifier.
Abstract: In this paper, test results from a 25-element active antenna prototype array operating in the frequency range of 10–70 MHz are presented. Observations of radio emission from different sources: solar sporadic radio emission and powerful cosmic radio sources including their ionosphere scintillation, demonstrate the high effectiveness of the system due to the Galactic background limited sensitivity and high dynamic range of the antenna amplifier (noise immunity). This demonstrates the capability of this 25-element active antenna array to engage in a wide range of unique wide band radio astronomical observations of solar system objects that do not require high sensitivity and angular resolution.
2 citations
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TL;DR: In this article, a linear array of active monopole antenna elements for transmitting signals in respective frequency ranges is presented, where the relative spacings and relative heights of successive elements along the array have logarithmic relationships.
Abstract: A transmit antenna for a surface wave radar system, including a linear array of active monopole antenna elements for transmitting signals in respective frequency ranges The relative spacings and the relative heights of successive elements along the array have logarithmic relationships The transmit antenna includes impedance matching circuits for the active monopole antenna elements, and switches for selecting one of the active antenna elements to transmit a signal in a corresponding frequency range while grounding the remaining active antenna elements
2 citations
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01 Sep 2011
TL;DR: The design of a dual-port dual-band annular slot active antenna suitable for communication use in smart grids & WLAN, a new active antenna is proposed for optimizing the smart grid.
Abstract: In this paper, the design of a dual-port dual-band annular slot active antenna suitable for communication use in smart grids & WLAN, a new active antenna is proposed for optimizing the smart grid. Two way commutations are key to making the grid smarter. The smart grids refer to system that can communicate data back and forth between a utility company and a customer. The wireless communication and antennas that utilize RF signals are often best suited to facilitate this grids communication. This antenna based on modern MIC and MMIC fabrication technology is used to develop a compact light weight, small size, high performance and low cost active antenna. 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 generates two separate frequency resonant modes cover to cover 2.45/5.2Ghz. The antenna is fabricated on one side of a Neltec substrate with εr =3.2 and thickness= 0.762 mm, and the microstrip feeding line is fabricated on the opposite side of the board. The antenna is designed to operate at WLAN bands centered at 2.45 and 5.2GHz. The simulated and measured results show fairly good agreement.
2 citations
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26 Jul 2018TL;DR: In this article, a method of determining a beam for use in wireless communication is presented. But the method is performed in a communication device comprising a digital receiver and an analog receiver.
Abstract: A method of determining a beam for use in wireless communication is disclosed. The method is performed in a communication device comprising a digital receiver and an analog receiver. The method comprises receiving signaling on an active antenna port by using the digital receiver, measuring power of one or more beams received at one or more of a respective currently inactive antenna ports by using the analog receiver, and determining, the beam for use in the wireless communication by comparing received power of a beam received at the active antenna port to the power of the one or more beams received at the one or more respective currently inactive antenna port, and determining the beam for use to be the beam having the highest received power. A communication device, computer program and computer program products are also disclosed.
2 citations
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10 Jun 2014TL;DR: Investigation results show that the super-cell configuration can mitigate unwanted back and side lobe effects in close proximity of the site and, therefore, provides a significant gain for users in this coverage area.
Abstract: Active Antenna System (AAS) is an advanced antenna technology that features the ability of advanced beam-forming techniques to provide a great flexibility in cellular network deployment which enables improvements in network capacity and coverage. Conventionally, network dimensioning is done based on busy hour traffic leading to cost-intensive over-dimensioning for most of the time via deploying additional macro and small cells. In AAS, however, varying traffic concentrations can be flexibly handled by dynamic cell densification, e.g. by splitting a sector into smaller “sub-sectors”. Vertical sectorization is a well-known approach where a conventional sector is split vertically in to two, inner and outer sectors, resulting in 3×2 sectors per site for AAS-based tri-sectorized site. In this paper work, an alternative vertical sectorization deployment configuration is presented where the inner sectors build a so called super-cell resulting from transmitting the same cell information in all inner sectors. Investigation results show that the super-cell configuration can mitigate unwanted back and side lobe effects in close proximity of the site and, therefore, provides a significant gain for users in this coverage area.
2 citations