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Patent

Antenna having split directors and antenna array comprising same

Chih-Chuan Yen
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TLDR
In this paper, an antenna array is provided comprising a pair of driven elements and two or more oppositely directed directional antennas at least one of which is as described above, and the passive elements of the antennas can be adjusted for a desired coverage pattern of the array, such as an azimuthal omnidirectional pattern.
Abstract: 
An antenna is provided comprising a pair of driven elements and a pair of passive elements. The driven elements are disposed on opposite sides of a reference plane, and the passive elements are also disposed on opposite sides of the reference plane. One or both passive elements may be provided in a different plane than the driven elements. By varying placement of the passive elements the antenna radiation pattern can be altered. An antenna array is also provided, comprising two or more oppositely directed directional antennas at least one of which is as described above. The passive elements of the antennas can be adjusted for a desired coverage pattern of the array, such as an azimuthal omnidirectional pattern, for example through simulation. The antenna or array may be embodied on a printed circuit board.

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Citations
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References
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Patent

Printed circuit board-configured dipole array having matched impedance-coupled microstrip feed and parasitic elements for reducing sidelobes

William Dean Killen, +1 more
TL;DR: In this article, a plurality of parasitic antenna elements are provided adjacent to the array of dipole elements of the antenna to reduce sidelobes in the radiation pattern of a phased array dipole antenna.
Patent

Antenna apparatus provided with dipole antenna and parasitic element pairs as arranged at intervals

Takeshi Ohno
TL;DR: Parasitic elements of each pair have a strip shape, and are formed on a straight line, which is parallel to a longitudinal direction of a printed dipole antenna and is positioned in a radiation direction of radio wave from the printed antenna as mentioned in this paper.