A Miniaturized Wearable Antenna With Five Band-Notched Characteristics for Medical Applications

In this letter, a miniaturized wearable antenna is proposed, which has five band-notched characteristics. The antenna uses Rogers 5880 as the dielectric substrate, with a thickness of 0.508 mm. Due to its thickness, the antenna can be bent slightly and used in the wearable field. The antenna is fed by a microstrip line with an input impedance of 50 Ω. Through the design of notch structures inside the radiating patch, on either side of the feed line, and on the bottom of the substrate, five notch bands are made possible. More notch bands can be produced by employing a new structure, which produces two notch bands as well as adding metal on the substrate's sides that allows current to be introduced into the notch structures on the bottom of the substrate. Based on this, it is possible to achieve great space utilization and little interaction among notch structures. The proposed antenna has overall size of 30 × 25 × 0.508 mm
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and covers the entire UWB spectrum from 2.56 to 12.7 GHz except notch bands from 2.58 to 3.21 GHz, 4.05 to 4.29 GHz, 5 to 5.64 GHz, 8.60 to 9.05 GHz, and 9.20 to 10.32 GHz. By applying the antenna to the doctor's chest badge, the number of swiping cards by hands can be reduced, which is convenient and avoids bacterial pollution. Thus, the antenna has a useful purpose in the medical development.