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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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Journal ArticleDOI
TL;DR: A cross-layer approach to transmit antenna selection capable of adapting the number of active antennas to varying channel conditions is investigated and adaptive modulation is included to jointly perform antenna selection and rate adaptation.
Abstract: In this paper, we investigate a cross-layer approach to transmit antenna selection capable of adapting the number of active antennas to varying channel conditions. We address a cross-layer methodology in the sense that the criterion for the selection of antenna subsets is the maximization of link layer throughput which takes into account characteristics both at the physical and link layers. In order to enhance system performance, adaptive modulation is included to jointly perform antenna selection and rate adaptation. Performance assessment is conducted in terms of link layer throughput and transmission delay

27 citations

Journal ArticleDOI
TL;DR: Nokia Siemens Networks and Vodafone have successfully tested a new antenna technology designed to reduce carbon emissions and improve the cost efficiency of mobile phone networks for operators.
Abstract: Nokia Siemens Networks and Vodafone have successfully tested a new antenna technology designed to reduce carbon emissions and improve the cost efficiency of mobile phone networks for operators. According to the companies, the tests, carried out through the Nokia Siemens Networks Innovation Center (NICE) initiative between the two companies, mark the first time that an integrated active antenna solution has been used on a commercial mobile wideband code division multiple access (WCDMA) telecommunications network. Nokia Siemens Networks Active Antenna incorporates elements of the base station within the antenna, reducing the footprint of base stations and lowering power consumption.

27 citations

Journal ArticleDOI
TL;DR: In this article, a 60 GHz active antenna based on a plate inhomogeneous Luneburg lens fed by several ridged waveguide sources is described and its measured radiation patterns are given, showing the good performances of this lens.
Abstract: The conception and performances of a 60 GHz active antenna, reconfigurable in terms of radiation pattern is described in this paper. This antenna is based on a plate inhomogeneous Luneburg lens fed by several ridged waveguide sources. The manufacturing technique of the plate lens is briefly described and its measured radiation patterns are given, showing the good performances of this lens. Simulated and measured radiation patterns are given for a passive lens antenna fed by several sources. The results show the beam scanning capability of this antenna. The active antenna is described and measurements of radiation patterns for several beams are given and demonstrate the beam scanning and beam shaping reconfigurability.

27 citations

Journal ArticleDOI
TL;DR: In this article, a GaN HEMT-based active antenna is designed for a load-pull simulation with a nonlinear model, which contributes to a lossless design and prevents power-added-efficiency (PAE) reduction by active-antenna integration.
Abstract: This paper aims to effectively integrate a GaN amplifier into a high-efficiency active-antenna design. In this paper, the antenna is designed for a GaN high-electron-mobility-transistor (HEMT) impedances calculated by a load–pull simulation with a GaN nonlinear model, which contributes to a lossless design and prevents power-added-efficiency (PAE) reduction by active-antenna integration. The antenna impedance is selected to reduce the impedance-transform ratio with the GaN HEMT. In addition, the active antenna includes a second-harmonic-tuning circuit for high efficiency. The active antenna comprises antenna- and amplifier-circuit layers piled onto a Peltier unit, which has a high affinity with this cooling systems. The antenna and amplifier circuits are designed on low- and high-dielectric substrates, respectively, enabling the amplifier to be downsized and the antenna gain to be increased. Each layer is connected by a through-hole. First, the single-stage amplifier is fabricated with a maximum output power of 37.95 dBm and a maximum PAE of 62.94%. Next, the GaN active antenna is fabricated with a maximum effective isotropically radiated power of 44.61 dBm and a maximum antenna gain of 23.99 dBi. The assumed amplifier large-signal characteristics of the active antenna agree with those of the single-stage amplifier. Therefore, the amplifier and the antenna are integrated without loss.

27 citations

Journal ArticleDOI
TL;DR: In this article, a self-oscillating semi-ring active integrated antenna is proposed to achieve frequency reconfiguration and voltage control simultaneously with a PIN diode, a varactor diode and proper biasing.
Abstract: A compact frequency-agile self-oscillating semi-ring active integrated antenna is presented and investigated. Without changing the circuit footprint, the proposed active antenna achieves frequency reconfigurability and voltage-controllability simultaneously with a PIN diode, a varactor diode, and proper biasing network. The oscillation frequency can be controlled from 4.47-4.85 GHz in the OFF state and 5.03-5.33 GHz in the ON state. The VCO gains are 17.7 and 16.4 MHz/V in the two states. Benefitting from the feedback path, the proposed active antenna, with a miniature size of 0.046λ02, shows well-behaved phase noises of -106.2 and -98.7 dBc/Hz at a 1-MHz offset from the carriers.

27 citations


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