A low-profile monopole antenna with height below ?0/16 is proposed. The antenna is based on a square substrate-integrated\ncavity radiating through apertures in its four side walls. This effectively creates a small square loop of magnetic currents, which\nradiates omnidirectionally as an electric monopole.The antenna cavity has a side length of less than ????0/3 and thus resonates in the\nmonomode region, in a fundamental TM11 mode. This means that the structure is robust in terms of feeding and manufacturing\ntolerances, as no parasitic modes can be excited. The designs of the cavity and the feed are introduced in detail. The measurement\nresults from a manufactured prototype operating at 5.9GHz show good agreement with simulations and validate the proposed\napproach.
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