Proceedings ArticleDOI
Wide band four-port butler matrix for switched multibeam antenna arrays
Tayeb A. Denidni,T.E. Libar +1 more
- Vol. 3, pp 2461-2464
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TLDR
The design and realization of a wide band four-port microstrip matrix to feed a switched-beam antenna array for wireless applications at 1.9 GHz is presented and experimental results is presented.Abstract:
This paper presents the design and realization of a wide band four-port microstrip matrix to feed a switched-beam antenna array for wireless applications at 1.9 GHz. The objective of this investigation is to develop an antenna-array feeding network based on Butler with a large bandwidth in order to cover the PCS band: 1900 MHZ to 2200 MHZ. In order to meet these requirements, wide band microwave components such as hybrids and crossovers were designed and used to Butler proposed matrix. The Butler matrix is used as a beamforming network that allows to produce orthogonal beams that can be steered in different directions. To examine the performance of the proposed matrix, simulated and experimental results is presented and discussed.read more
Citations
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Journal ArticleDOI
Novel butler matrix using CPW multilayer technology
TL;DR: In this article, a 4 times 4 two-layer Butler matrix based on a broadband broadband 2-layer slot-coupled directional coupler is presented and implemented at 58 GHz using coplanar waveguide technology.
Journal ArticleDOI
Printed S-Band 4 $\times$ 4 Nolen Matrix for Multiple Beam Antenna Applications
TL;DR: In this paper, a 4 x 4 Nolen matrix design is presented, which design is centred at 2.2 GHz, with the amplitude and phase output excitation laws of a Butler matrix using 90deg hybrids.
Proceedings ArticleDOI
Novel Butler matrix using CPW multi-layer technology
TL;DR: In this article, a new configuration of a coplanar waveguide (CPW) beamforming 8-port Butler matrix operating at 5.8 GHz is presented, which is based on a novel CPW multilayer directional coupler.
Journal ArticleDOI
Extracellular HSP27 mediates angiogenesis through Toll-like receptor 3
Dominique Thuringer,Gaëtan Jego,Gaëtan Jego,Guillaume Wettstein,Olivier Terrier,Laurent Cronier,Nadhir Yousfi,Sophie Hébrard,André Bouchot,Adonis Hazoumé,Anne-Laure Joly,Martin E. Gleave,Manuel Rosa-Calatrava,Eric Solary,Carmen Garrido,Carmen Garrido +15 more
TL;DR: It is shown that extracellular HSP27 has a proangiogenic effect evidenced on chick chorioallantoic membrane, which mediates angiogenesis through Toll‐like receptor 3.
Journal ArticleDOI
Broadband 4 $\times$ 4 Butler Matrices as a Connection of Symmetrical Multisection Coupled-Line 3-dB Directional Couplers and Phase Correction Networks
S. Gruszczynski,K. Wincza +1 more
TL;DR: In this article, an innovative approach for realization of broadband 4 times 4 Butler matrices, in which broadband symmetrical multisection 3-dB/90deg directional couplers are used as basic elements, has been presented.
References
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Journal ArticleDOI
Smart antennas for wireless systems
TL;DR: Standard cellular antennas, smart antennas using fixed beams, and adaptive antennas for base stations, as well as antenna technologies for handsets are described and the potential improvement that these antennas can provide is shown.
Journal ArticleDOI
Performance of switched-beam smart antennas for cellular radio systems
TL;DR: In this article, the performance and feasibility of switched-beam smart antennas for cellular radio systems is investigated and the trunking efficiency degradation caused by narrow-beam sectoring can be recovered or even improved by using a variety of trunkpool techniques.