Jackson Walker, L.L.P.
Feed network for simultaneous generation of narrow and wide beams with a rotational-symmetric antenna
An N-element rotational-symmetric array antenna can generate N fixed pencil-beams simultaneously with an omnidirectional beam. An N&times;N Butler matrix can be used to feed the array antenna, using fewer than N input ports of the Butler matrix to produce the pencil-beams. One or more of the modes generated by the Butler matrix can be individually accessed to produce one or more corresponding omnidirectional beams. The N&times;N Butler matrix can be driven by a feed network that provides both power dividing and beam-steering, which permits simultaneous generation of the N pencil-beams.
Telefonaktiebolaget LM Ericsson (publ)
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inventional inventional inventional inventional
Martin Bjorn Bo
Johansson Johannisson Hagerman