Development of a Compact Rectenna for Wireless Powering of a Head-Mountable Deep Brain Stimulation Device

• Published in: IEEE journal of translational engineering in health and medicine Vol. 2; pp. 1 - 13
• Main Authors: Hosain, Md Kamal, Kouzani, Abbas Z., Tye, Susannah J., Abulseoud, Osama A., Amiet, Andrew, Galehdar, Amir, Kaynak, Akif, Berk, Michael
• Format: Journal Article
• Language: English
• Published: United States IEEE 01.01.2014
• Subjects: Brain modeling; DC machines; Impedance; Power transmisison; Rectennas; Satellite broadcasting; Wireless communication; specific absorption rate; planar inverted-F antenna; head mountable device; passive device; rat; Deep brain stimulation
• ISSN: 2168-2372; 2168-2372
• DOI: 10.1109/JTEHM.2014.2313856

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 × 12.5 mm × 1.5 mm and resonance frequency of 915 MHz with a measured bandwidth of 15 MHz at return loss of -10 dB. A dielectric substrate of FR-4 of ε r = 4.8 and δ = 0.015 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.