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Two linearly polarized millimeter wave planar leaky wave antennas designed for broadside radiation at 61 GHz with high gain and low sidelobes of radiation patterns are presented. Both antennas have a center-fed single-layer structure composed of two one-dimensional periodic symmetric arrays of metal strips of variable width on a grounded dielectric waveguide, but with different excitation devices for the dielectric waveguide, represented by a microstrip combline and a waveguide-fed linear substrate integrated slotted waveguide array. The antennas exhibit low return loss, antenna gain 26-27 dBi and radiation pattern sidelobe level in both E- and H-planes, not exceeding −20 dB. The antennas may be used, for example, in security sensors.

A compact linearly polarized three-element antenna with sector radiation pattern and a cylinder antenna array with electrically switchable radiation pattern for base stations of mobile radio communication systems are presented. The operational frequency range of the antennas is 440-470 MHz. The single antenna has antenna gain not less than 7 dBi, while the antenna gain of the cylinder antenna array is not less than 5 dBi in case of omnidirectional radiation pattern and 10 dBi in case of sector radiation pattern.

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