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Abstract
A planar inverted-F chip antenna based on a Barium Strontium Titanate—cycloolefin copolymer (BST-COC) polymer composite for 2.4 GHz wrist applications was designed and characterized. A relative permittivity of 13.8 and dielectric loss of 0.0015 at 2.55 GHz were characterized for the composite material using ring resonator structures at 2.55 GHz. The fabricated antenna has a very compact size of 9 mm × 6 mm × 5 mm, well suited for wrist-type applications. The antenna covers the 2.4 WLAN (2.4–2.484 GHz) frequency band with more than 60% radiation efficiency. The proximity effect of the user's hand on the performance of the antenna was also investigated.
Acknowledgments
The author VP acknowledges the Finnish Foundation for Technology Promotion, the Riitta and Jorma J. Takanen Foundation, and the Tauno Tönninki Foundation for financial support of the work.