TY - JOUR
T1 - Design of miniaturized antenna and power harvester circuit on the enucleated porcine eyes
AU - Cheng, Hui Wen
AU - Yu, Tsung Chi
AU - Huang, Hong Yi
AU - Ting, Ssu Han
AU - Huang, Tzuen-Hsi
AU - Chiou, Jin Chern
AU - Luo, Ching Hsing
PY - 2014/1/1
Y1 - 2014/1/1
N2 - This letter describes a prototype of a miniaturized rectifying antenna (rectenna) design for the wireless powering of an ocular device. In contrast to the conventional on-lens loop antenna, this letter presents a loop antenna with stepped structures for optimal impedance to the rectifier. The return loss of the antenna less than-15 dB at 3 GHz is accomplished in a contact lens with a diameter ranging from 10 to 15 mm. Additionally, the radio frequency (RF) rectifier and voltage-boosting network (VBN) are optimized to enhance the power conversion efficiency (PCE) by using the voltage boosting technique. Experimental results indicate that the optimal rectifier, which is fabricated with the TSMC 0.18-μm process, produces a dc output voltage of 2.94 V and a conversion efficiency of 31% across a resistive 3.5 kΩ load with an input power of $+$9 dBm. Moreover, the rectenna under the experiment with an enucleated porcine eye can be powered wirelessly with a transmitting device at a distance of 4 cm. The output power is 2.01 mW with a transmitting power of +32 dBm for the wireless ocular physiological monitoring (WOPM) system. Importantly, this letter demonstrates the feasibility of an optimal miniaturized on-lens rectenna design, capable of overcoming the RF power attenuation on the ocular tissue to increase the delivering distance and reduce the transmitting power.
AB - This letter describes a prototype of a miniaturized rectifying antenna (rectenna) design for the wireless powering of an ocular device. In contrast to the conventional on-lens loop antenna, this letter presents a loop antenna with stepped structures for optimal impedance to the rectifier. The return loss of the antenna less than-15 dB at 3 GHz is accomplished in a contact lens with a diameter ranging from 10 to 15 mm. Additionally, the radio frequency (RF) rectifier and voltage-boosting network (VBN) are optimized to enhance the power conversion efficiency (PCE) by using the voltage boosting technique. Experimental results indicate that the optimal rectifier, which is fabricated with the TSMC 0.18-μm process, produces a dc output voltage of 2.94 V and a conversion efficiency of 31% across a resistive 3.5 kΩ load with an input power of $+$9 dBm. Moreover, the rectenna under the experiment with an enucleated porcine eye can be powered wirelessly with a transmitting device at a distance of 4 cm. The output power is 2.01 mW with a transmitting power of +32 dBm for the wireless ocular physiological monitoring (WOPM) system. Importantly, this letter demonstrates the feasibility of an optimal miniaturized on-lens rectenna design, capable of overcoming the RF power attenuation on the ocular tissue to increase the delivering distance and reduce the transmitting power.
UR - http://www.scopus.com/inward/record.url?scp=84903635043&partnerID=8YFLogxK
UR - http://www.scopus.com/inward/citedby.url?scp=84903635043&partnerID=8YFLogxK
U2 - 10.1109/LAWP.2014.2328611
DO - 10.1109/LAWP.2014.2328611
M3 - Article
AN - SCOPUS:84903635043
VL - 13
SP - 1156
EP - 1159
JO - IEEE Antennas and Wireless Propagation Letters
JF - IEEE Antennas and Wireless Propagation Letters
SN - 1536-1225
M1 - 6825846
ER -