title: Development of a Compact Rectenna for Wireless Powering of a Head-Mountable Deep Brain Stimulation Device.
abstract: Design of a rectangular spiral planar inverted-F antenna (PIFA) at 915 MHz for wireless power transmission applications is proposed. The antenna and rectifying circuitry form a rectenna, which can produce dc power from a distant radio frequency energy transmitter. The generated dc power is used to operate a low-power deep brain stimulation pulse generator. The proposed antenna has the dimensions of 10 mm [Formula: see text]12.5 mm [Formula: see text]1.5 mm and resonance frequency of 915 MHz with a measured bandwidth of 15 MHz at return loss of [Formula: see text]. A dielectric substrate of FR-4 of [Formula: see text] and [Formula: see text] with thickness of 1.5 mm is used for both antenna and rectifier circuit simulation and fabrication because of its availability and low cost. An L-section impedance matching circuit is used between the PIFA and voltage doubler rectifier. The impedance matching circuit also works as a low-pass filter for elimination of higher order harmonics. Maximum dc voltage at the rectenna output is 7.5 V in free space and this rectenna can drive a deep brain stimulation pulse generator at a distance of 30 cm from a radio frequency energy transmitter, which transmits power of 26.77 dBm.
authors.forename: M D Kamal
authors.initials: MD
authors.lastname: Hosain
authors.forename: Abbas Z
authors.initials: AZ
authors.lastname: Kouzani
authors.forename: Susannah J
authors.initials: SJ
authors.lastname: Tye
authors.forename: Osama A
authors.initials: OA
authors.lastname: Abulseoud
authors.forename: Andrew
authors.initials: A
authors.lastname: Amiet
authors.forename: Amir
authors.initials: A
authors.lastname: Galehdar
authors.forename: Akif
authors.initials: A
authors.lastname: Kaynak
authors.forename: Michael
authors.initials: M
authors.lastname: Berk
keywords: Deep brain stimulation; head mountable device; passive device; planar inverted-F antenna; rat; specific absorption rate