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Broadband Butler matrix with flat coupling

Broadband Butler matrix with flat coupling

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Published

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.

Inspec keywords: antenna arrays; waveguide couplers; phase shifters

Other keywords: phase shifters; broadband Butler matrix; disk hybrids; narrowband structures

Subjects: Waveguide and microwave transmission line components; Other analogue circuits; Antenna arrays

References

    1. 1)
      • M.J. Page , S.R. Judah . A microstrip planar disk 3 dB quadrature hybrid. IEEE MTTS Dig. , 247 - 250
    2. 2)
    3. 3)
      • W. Rotman , R. Turner . Wide-angle microwave lens for line source applications. IEEE Trans. Antenna Propag. , 6 , 623 - 632
    4. 4)
      • J. Butler , R. Lowe . Beamforming matrix simplifies design of electrically scanned antennas. Electron. Des. , 7 , 170 - 173
    5. 5)
      • B.M. Schiffman . A new class of broad-band microwave 90-degree phase shifters. IEEE Trans. Microw. Theory Tech. , 2 , 232 - 237
    6. 6)
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