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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Patent•
17 Jan 2003TL;DR: In this paper, an active antenna consisting of a network of elementary sources which is positioned at the focal point of a focusing reflector was proposed to improve the efficiency of the optics and enable the use of polarisation duplexers behind the antenna.
Abstract: The invention relates to a receiving antenna for satellite telecommunications. More specifically, the invention relates to an active antenna comprising a network of elementary sources which is positioned at the focal point of a focusing reflector. According to the invention, said network of sources is disposed on a more or less spherical, concave surface S. The aforementioned arrangement can be used to: (i) improve the efficiency of the optics and (ii) enable the use of polarisation duplexers behind surface S in order to increase the spectral efficiency of the antenna.
5 citations
Patent•
06 Dec 1976
TL;DR: In this paper, an electronic clock, such as a quartz-crystal clock, is tested and may be adjusted by measuring the oscillation frequency of the clock with an active antenna.
Abstract: An electronic clock, such as a quartz-crystal clock, is tested and may be adjusted by measuring the oscillation frequency of the clock with an active antenna. The oscillation frequency is electrically compared with a reference frequency to determine deviation and provide an output indication. Internal calibration is carried out when the system is not being used for testing.
5 citations
TL;DR: In this paper, several different millimeter-wave Talbot array illuminator (TAIL) configurations are examined and experimentally examine several novel millimeterwave applications of the Talbot effect.
Abstract: We propose and experimentally examine several novel millimeter-wave applications of the Talbot effect. First, several different millimeter-wave Talbot array illuminator (TAIL) configurations are examined. The TAILs are formed by combining a lens and a phase grating with different antenna array layers. Subsequently, a second phase grating is introduced at an appropriate location beyond the array layer to arrive at an architecture that is suitable for use as an active transmit antenna. Finally, with the addition of a second lens to collect the energy beyond the transmit structure, a spatial power amplification architecture is presented.
5 citations
08 Mar 2020
TL;DR: A 28 GHz radio-over-fiber system with laser-less, low-cost active antenna units using silicon photonics and a GaAs driver and LNA and 7-Gb/s downlink and uplink throughput was achieved.
Abstract: We demonstrate a 28 GHz radio-over-fiber system with laser-less, low-cost active antenna units using silicon photonics and a GaAs driver and LNA. 7-Gb/s downlink and uplink throughput was achieved over 2km SSMF and 5m wireless.
5 citations
16 Mar 2009
TL;DR: In this paper, a comparative performance assessment of the side lobe level, the occurrence of grating lobes, the packing density of the active circuitry, and the suitability for polarization multiplexing is presented.
Abstract: Rectangular and triangular arrangements of active antenna array elements are studied. The comparative performance assessment is based on the achievable side lobe level, the occurrence of grating lobes, the packing density of the active circuitry, and, in particular, the suitability for polarization multiplexing.
5 citations