Results 21 to 30 of about 16,092 (254)
BUTLER MATRIX IN MICROSTRIP-SLOT TECHNOLOGY
International Journal of Research -GRANTHAALAYAH, 2017 The design of a 4 x 4 Butler Matrix for use in a multi-beam antenna array operating over wide frequency band is presented. In order to achieve wideband characteristics, the matrix uses microstrip-slot technology that employs two microstrip dielectric layers with a common ground plane and a coupling slot.
D.Rajeswari, T.Jayanthy
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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
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IEEE Access, 2020 In this paper, a smart antenna array based on the image-aware technique that can automatically switch its beam to track users is proposed. Mobilenet, a deep neural network (DNN), is utilized to find the users' position information from images; it is ...
Yuchen Ma +7 more
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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
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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
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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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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
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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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Broadband Butler matrix with flat coupling
Electronics Letters, 2007 Conventional Butler matrices composed of hybrids, crossovers and phase shifters, are narrowband structures. Presented is a constant coupling and phase shift broadband Butler matrix with a simple structure using novel disk hybrids and improved phase shifters.
S. Zheng, W.S. Chan, S.H. Leung, Q. Xue
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