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Dual-ID headgear UHF RFID tag with broadside and end-fire patterns based on quasi-Yagi antenna

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Original languageEnglish
Title of host publicationProceedings of IEEE Asia-Pacific Microwave Conference
Number of pages3
ISBN (Electronic)9781728135175
Publication statusPublished - 10 Dec 2019
Publication typeA4 Article in a conference publication
EventIEEE Asia-Pacific Microwave Conference - Singapore, Singapore, Singapore
Duration: 10 Dec 201913 Dec 2019


ConferenceIEEE Asia-Pacific Microwave Conference
Abbreviated titleAPMC
Internet address


We present a wearable quasi-Yagi antenna on a periodic surface for a dual-ID passive UHF RFID tag embedded in headgear. The antenna produces a near end-fire radiation pattern directed towards the user's line of sight with the directivity of 4 dBi. Moreover, it integrates another tag by utilizing the Yagi antenna's reflector as a second dipole tag antenna with broadside radiation directed upwards from the user. Hence, in one platform, we obtain a dual-ID tag with near end-fire and broadside patterns for the two tag IDs. The former is achieved by inserting a periodic surface made up of a 2-by-2 grid of square loops in between the antenna and the body. This enhances the launching of surface waves for achieving the end-fire radiation and suppresses the undesired electromagnetic antenna-body interaction.

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