Optical Implementation of Butler Matrix for Hardware-Efficient Multiuser Beamforming
IEEE Photonics Journal, 2018 Phased antenna arrays have been used extensively for massive MIMO-based multiuser beamforming to improve both the throughput and power efficiency of wireless communication systems.
Huiyuan Liu +5 more
doaj +1 more source
Flexible Phase Difference of 4 × 4 Butler Matrix without Phase-Shifters and Crossovers
International Journal of Antennas and Propagation, 2019 This paper proposes a new Butler matrix topology. The proposed Butler matrix consists of only four couplers without phase shifters and crossovers. The output phase difference is relatively flexible.
Ke Han, Wuyu Li, Yibin Liu
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A 20-GHz-Band
IEEE Access, 2019 In this paper, a 20-GHz-band 64 x 64 hollow waveguide Butler matrix is proposed. By using two-plane short slot couplers and a modified diagram, a short-axis two dimensional Butler matrix is realized.
Takashi Tomura +5 more
doaj +1 more source
Dundee Discussion Papers in Economics 253:Spatial Interactions in Hedonic Pricing Models: The Urban Housing Market of Aveiro, Portugal [PDF]
, 2011 Spatial heterogeneity, spatial dependence and spatial scale constitute key features of spatial analysis of housing markets. However, the common practice of modelling spatial dependence as being generated by spatial interactions through a known spatial ...
Anselmo de Castro, Eduardo +2 more
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A Low Complexity
IEEE Access, 2019 Beamforming networks such as Butler Matrices are important for multibeam array antenna applications. The challenge for Butler Matrix design is that their complexity increases with the number of ports.
Qingling Yang +7 more
doaj +1 more source
High resolution beam switch antenna based on modified CRLH Butler matrix
Engineering Reports, 2021 A new beam switch antenna based on a composite right/left‐handed (CRLH) Butler matrix is presented and experimentally validated. The CRLH transmission line (TL) is proposed to increase the number of beams.
Reza Karimian +3 more
doaj +1 more source
Generalized One-Dimensional Parallel Switching Matrices With an Arbitrary Number of Beams
IEEE Journal of Microwaves, 2021 This paper introduces a novel family of one-dimensional switching matrices, also known as beamforming networks (BFNs), which can be sized for an arbitrary number of beams.
Jiro Hirokawa, Nelson J. G. Fonseca
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Wide bandwidth Butler matrix network
Electronics Letters, 1967 Butler matrix networks, used for forming multiple beams from linear aerial arrays, are limited in their bandwidth of operation by their requirement for components with constant values of phase shift over this bandwidth. This letter describes a method for designing such networks for wide-bandwidth operation by employing particular combinations of ...
P.E.K. Chow, D.E.N. Davies
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Dual-band Butler matrix for WLAN systems [PDF]
IEEE MTT-S International Microwave Symposium Digest, 2005., 2005 This paper shows the design of a dual-band Butler matrix aimed to cover the bands corresponding to the standards IEEE802.11a/b, with particular interest in WLAN systems, at the 2.4 GHz and 5 GHz bands. Measurements of the individual dual-band components which compose the Butler matrix are presented.
Collado Gómez, Juan Carlos +2 more
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Hybrid Analog-Digital Precoding Revisited under Realistic RF Modeling [PDF]
, 2016 In this paper we revisit hybrid analog-digital precoding systems with emphasis on their modelling and radio-frequency (RF) losses, to realistically evaluate their benefits in 5G system implementations.
Garcia-Rodriguez, Adrian +3 more
core +2 more sources