Abstract
AbstractIn this paper, a miniaturized planar inverted‐F antenna (PIFA) with a volume of 49.5 mm3 is proposed for biomedical implantable devices, operating in Medical Implant Communications Service (MICS, 402‐405 MHz) band and Industrial, Scientific, and Medical (ISM, 2.40‐2.48 GHz) band. It has a wide operating bandwidth in MICS band. The initial PIFA is designed with dual‐band performance, where the lower band is formed by quarter‐guided‐wavelength resonance and the higher band is formed by two‐guided‐wavelength resonance. Furthermore, by etching open‐slots between short and feed on the ground, a new resonance is introduced and moved towards the fundamental one, expanding the bandwidth in MICS band. Also, the introduction of slots lowers the initial resonant frequency in higher band, meeting the frequency demands of ISM band. Finally, the proposed antenna is measured in pork as well as skin‐mimicking gels, showing a bandwidth of 50.7% and 38% in MICS band, and 13.9% and 6.9% in ISM band.
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