Abstract
We present a quasi-Yagi antenna that provides low-profile and endfire radiation for a wearable RFID tag placed on top of the head. The antenna provides directivity of 4.9 dBi in the direction where the user is facing. This is a contrasting feature compared with most wearable antennas radiating towards the direction of the body surface normal. We achieved this by separating the antenna from the body by a periodic surface made up of 3-by-3 grid of square patches, which supports the launching of surface waves for endfire radiation and reduces electromagnetic antenna-body interaction.
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