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Planar array

About: Planar array is a research topic. Over the lifetime, 2897 publications have been published within this topic receiving 33269 citations. The topic is also known as: Array antenna.


Papers
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Patent
22 Jan 2004
TL;DR: In this paper, a planar array of electrically-interconnected LED chips are positioned within the input apertures of a corresponding array of shaped metallic reflecting bins using at least one of elevated prismatic films, polarization converting films, micro-lens arrays and external hemispherical or ellipsoidal reflecting elements.
Abstract: A compact and efficient optical illumination system featuring planar multi-layered LED light source arrays concentrating their polarized or un-polarized output within a limited angular range. The optical system manipulates light emitted by a planar array of electrically-interconnected LED chips positioned within the input apertures of a corresponding array of shaped metallic reflecting bins using at least one of elevated prismatic films, polarization converting films, micro-lens arrays and external hemispherical or ellipsoidal reflecting elements. Practical applications of the LED array illumination systems include compact LCD or DMD video image projectors, as well as general lighting, automotive lighting, and LCD backlighting.

566 citations

Patent
22 May 1998
TL;DR: In this paper, an apparatus and system for simultaneously analyzing a plurality of analytes anchored to microparticles is presented, which is characteristic of the interaction between the analyte carried by the microparticle and the delivered processing reagent.
Abstract: An apparatus and system are provided for simultaneously analyzing a plurality of analytes anchored to microparticles. Microparticles each having a uniform population of a single kind of analyte attached are disposed as a substantially immobilized planar array inside of a flow chamber where steps of an analytical process are carried out by delivering a sequence of processing reagents to the microparticles by a fluidic system under microprocessor control. In response to such process steps, an optical signal is generated at the surface of each microparticle which is characteristic of the interaction between the analyte carried by the microparticle and the delivered processing reagent. The plurality of analytes are simultaneously analyzed by collecting and recording images of the optical signals generated by all the microparticles in the planar array. A key feature of the invention is the correlation of the sequence of optical signals generated by each microparticle in the planar array during the analytical process.

495 citations

Journal ArticleDOI
TL;DR: In this article, an in situ method for damage detection in thin-wall structures using embedded two-dimensional ultrasonic phased arrays is presented. Butts et al. used piezoelectric wafer active sensors to generate and receive guided Lamb waves propagating in the plate-like structure.

287 citations

Journal ArticleDOI
TL;DR: A novel hybrid adaptive antenna array which consists of analogue subarrays followed by a digital beamformer is presented in this paper to overcome the digital implementation difficulty.
Abstract: Owing to the excessive demand on signal processing and space constraint, a full digital implementation of a large adaptive antenna array at millimeter wave frequencies is very challenging. Targeted at long range high data rate point-to-point link in the 70/80 GHz bands, a novel hybrid adaptive antenna array which consists of analogue subarrays followed by a digital beamformer is presented in this paper to overcome the digital implementation difficulty. Two subarray configurations, the interleaved subarray and the side-by-side subarray, are proposed, and two Doppler resilient adaptive angle-of-arrival estimation and beamforming algorithms, the differential beam tracking (DBT) and the differential beam search (DBS), are developed. Simulation results on the DBT and DBS performance are provided using a 64 element hybrid planar array of four 4 by 4 element subarrays with the two subarray configurations, respectively. Recursive mean square error (MSE) bounds of the developed algorithms are also analyzed and compared with simulated MSEs.

252 citations

Journal ArticleDOI
TL;DR: In this paper, the element placement in a concentric ring array is optimized to obtain the lowest maximum sidelobe level at boresight in order to minimize the sidelobe overhead.
Abstract: It is described how to optimize the element placement in a concentric ring array to obtain the lowest maximum sidelobe level at boresight.

246 citations


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Performance
Metrics
No. of papers in the topic in previous years
YearPapers
202362
2022131
2021126
2020154
2019190
2018159