Journal Article10.1109/TMTT.2016.2582877
Broadband Integrated $8 \times 8$ Butler Matrix Utilizing Quadrature Couplers and Schiffman Phase Shifters for Multibeam Antennas With Broadside Beam
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TL;DR: In this article, a planar realization of a broadband $8 \times 8$ Butler matrix with phase progressions 0°, ±45° and ±90° has been proposed.
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Abstract: A novel realization of a broadband $8 \times 8$ Butler matrix having phase progressions 0°, ±45°, ±90°, ±135°, and 180° has been proposed. The presented network is composed of coupled-line 3-dB/90° directional couplers and Schiffman phase shifters that ensure its broadband amplitude and phase characteristics. The proposed solution allows for a fully planar realization without any interlayer connections, which has been achieved by both rearrangement of the matrix layout and realization of the selected crossovers as tandem connections of quadrature directional couplers. The proposed concept has been verified experimentally by the design of a Butler matrix operating within 2.5–3.5 GHz and applied in a multibeam antenna array with broadside beam.
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Citations
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References
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IEEE Transactions on Microwave Theory and Techniques and Antennas and Propagation Announce a Joint Special Issue on Ultra-Wideband (UWB) Technology
David D. Wentzloff,K.V.S. Rao +1 more
TL;DR: In this paper, the authors proposed a wideband ultra wideband (UWB) communication protocol with a low EIRP level (−41.3dBm/MHz) for unlicensed operation between 3.1 and 10.6 GHz.
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Design of a Beam Switching/Steering Butler Matrix for Phased Array System
TL;DR: In this paper, a compact broadband 8-way Butler matrix integrated with tunable phase shifters is proposed to provide full beam switching/steering capability, which exhibits an average insertion loss of 1.1 dB with amplitude variation less than ± 2.2 dB.
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Multiple beams from linear arrays
J. Shelton,K. Kelleher +1 more
TL;DR: The problem of devising a passive RF transmission line feed system to provide independent multiple outputs from a linear array and the problem of finding applicable junctions more complex than the hybrid is considered.
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