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
More filters
TL;DR: In this paper, the authors integrated a microwave oscillator with a zeroth-order resonance antenna to build an active oscillating antenna using the coplanar waveguide technology.
Abstract: We have integrated a microwave oscillator with a zeroth-order resonance antenna to build an active oscillating antenna using the coplanar waveguide technology. In this design, the antenna is electrically small and the oscillator has an excellent phase noise performance of 92.5 dBc/Hz. Also, 16.11 dBm (40.83 mW) of effective isotropic radiated power is radiated with high direct current to radio frequency efficiency (27.2%), which is much higher than many other active oscillating antenna designs. © 2013 Wiley Periodicals, Inc. Microwave Opt Technol Lett 55:1240–1243, 2013; View this article online at wileyonlinelibrary.com. DOI 10.1002/mop.27543
5 citations
01 Aug 2017
TL;DR: Simulation results reveal that with the proposed pulses the authors can significantly improve the SM spectral efficiency as compared to other pulses considered in the literature, aiming at improving the system's spectral efficiency.
Abstract: Spatial modulation (SM) is a recent Multiple-Input Multiple-Output (MIMO) transmission technique in which part of the information is transmitted by the index indicating an active antenna. The other part of the information is transmitted by sending a symbol from a digital modulation through this antenna. The advantage of SM compared to other MIMO techniques is that a single RF chain is required. However, since in traditional SM the active antenna selection is made at the symbol rate, the duration of the transmission pulse is limited, resulting in a bandwidth efficiency reduction, a fact that is generally neglected in the literature. Ishibashi and Sugiura have recently proposed a technique that makes use of additional RF chains, where the symbols are transmitted alternately by the RF chains. They performed a spectral efficiency analysis assuming a raised-cosine pulse. In this paper, other shaping pulses better localized both in time and frequency, such as the prolate spheroidal wave function (PSWF) and Gaussian pulses, are proposed, aiming at improving the system's spectral efficiency. Simulation results reveal that with the proposed pulses we can significantly improve the SM spectral efficiency as compared to other pulses considered in the literature.
5 citations
01 Aug 2015
TL;DR: In this article, a conformal traveling wave active antenna based on interdigital capacitor structure for 2.35MHz communication between an experimental rocket and the ground station was developed and realized through wet etching technique for experimental characterization.
Abstract: This paper deals with the development of conformal traveling wave active antenna based on interdigital capacitor structure for 2.35MHz communication between an experimental rocket and the ground station. The proposed active antenna which has the dimension of 238.64mm × 45mm consists of 7 blocks of interdigital capacitor structure as antenna radiators connected with 6 pairs of RF amplifier as active components. All the components of active antenna are deployed on an RT/Duroid® 6010LM dielectric substrate with the thickness of 0.127mm. The use of very thin dielectric substrate for antenna realization is aimed to have a conformable antenna which fits the cylindrical body of experimental rocket. After obtaining the optimum performance design, the proposed active antenna is then realized through wet etching technique for experimental characterization. As comparison, a conformal traveling wave passive antenna is simultaneously developed and realized on the same dielectric substrate with the dimension of of 238.64mm × 22mm. From the characterization result, it shows that the realized active antenna resonates at center frequency of 2.3625GHz with gain of −16.648dBi. This result is slightly different with the realized passive antenna which resonates at center frequency of 2.375GHz with gain of −18.763dBi.
5 citations
Patent•
24 May 2006
TL;DR: In an active antenna system, two or more amplification chains are contained on one integrated circuit substrate or in one hybrid circuit The amplification chains can be connected to at least one of a plurality of radiating elements as mentioned in this paper.
Abstract: In an active antenna system, two or more amplification chains are contained on one integrated circuit substrate or in one hybrid circuit The amplification chains can be connected to at least one of a plurality of radiating elements The integrated circuit or hybrid circuit can be incorporated into an active antenna connector, which can be electrically connected to a radiating element or a receiver system, for example A first integrated circuit or hybrid circuit can be exchanged with a second integrated circuit or hybrid circuit in a connector to adjust properties of an active antenna system
4 citations
26 Mar 2012
TL;DR: In this article, an active receiving antenna based on a printed monopole and a bipolar transistor was used in order to miniaturize the size and increase the bandwidth of the active receiving antennas in VHF band.
Abstract: An active receiving antenna based on a printed monopole and a bipolar transistor is presented in this paper. A transistor is used in order to miniaturize the size and increase the bandwidth of the active receiving antenna in VHF band. The influence of the transistor location on the behavior of a active antenna is investigated. The simulated and measured results are in good agreement.
4 citations