Patch antenna for millimeter wave communications

A patch antenna, comprising:

• a ground plane disposed in a first plane, the ground plane having a first aperture at which the patch antenna is fed with an RF signal by a feed line;
• a main patch disposed in a second plane parallel to the first plane, the first and second planes spaced apart to form a first antenna cavity between the ground plane and the main patch, the main patch having a second aperture, wherein the patch antenna has a first desired operating frequency within a millimeter wave frequency range over which wireless communications is supported and the first desired operating frequency is a function of a length of the second aperture, the length of the second aperture being set to achieve the first desired operating frequency of the patch antenna;
• and
• a parasitic patch disposed in a third plane parallel to the first and second planes, the third plane spaced apart from the second plane to form a second antenna cavity between the main patch and the parasitic patch on a side of the main patch opposite the first antenna cavity, the parasitic patch adding a second desired operating frequency within the millimeter wave frequency range to the patch antenna over which wireless communications is supported, the second desired operating frequency higher than the first desired operating frequency;
• and
• wherein the length of the second aperture is further set to achieve the second desired operating frequency of the patch antenna by establishing a hybrid mode where both the main patch and the parasitic patch radiate at the second desired operating frequency.