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This paper presents a wideband or high gain 4x4 array operating in k-band. The unit cell of this array is a rectangular patch antenna in a stacked configuration. Four rectangular patches are passively excited by an additional rectangular patch located underneath. The latter is excited by a substrate integrated waveguide (SIW) through an aperture etched on the ground plane. By moving the relative position, and therefore the overlapped area, between the passive patches and the active one, a wideband or a high gain behavior can be obtained, maintaining the same layout. The proposed array achieves the impedance bandwidth of 12.55% with a gain of 22 dBi for the wideband case. In the high gain case, the impedance bandwidth is 5.5% with a gain of 24 dBi.

High gain k-band patch antenna for low earth orbit interlink between nanosatellites