Browsing by Author "Ting, Ssu-Han"

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Broadband Loop Antenna on Soft Contact Lens for Wireless Ocular Physiological Monitoring
(2014)
Ting, Ssu-Han
;
Jeng, Bo-Ming
;
Chen, Wen-Shan
;
Chiou, Jin-Chern
;
Luo, Ching-Hsing
This paper presents a novel loop antenna with broadband for wireless ocular physiological monitoring (WOPM). The antenna is fabricated on a thin-film poly-para-xylylene C (parylene C) substrate with a small thickness of 11 mu m and dimension of pi x 6.5 x 6.5 mm(2). With the advantage of small size, the proposed antenna is suitable to apply to the soft contact lens and transmit the signal in microelectromechanical Systems (MEMS). Because the pig's eye and human's eye have similar parameters of conductivity and permittivity, the experimental results are obtained by applying the proposed antenna on the pig's eye and cover from 1.54 to 6GHz for ISM band (2.4 and 5.8GHz) applications. The measured antenna radiation patterns, antenna gains, and radiation efficiency will be demonstrated in this paper, which are suitable for application of wireless ocular physiological monitoring.
Design of Miniaturized Antenna and Power Harvester Circuit on the Enucleated Porcine Eyes
(2014-01-01)
Cheng, Hui-Wen
;
Yu, Tsung-Chi
;
Huang, Hong-Yi
;
Ting, Ssu-Han
;
Huang, Tzuen-Hsi
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-mu m process, produces a dc output voltage of 2.94 V and a conversion efficiency of 31% across a resistive 3.5 k Omega 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.
Design of Miniaturized Antenna and Power Harvester Circuit on the Enucleated Porcine Eyes
(2014-01-01)
Cheng, Hui-Wen
;
Yu, Tsung-Chi
;
Huang, Hong-Yi
;
Ting, Ssu-Han
;
Huang, Tzuen-Hsi
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-mu m process, produces a dc output voltage of 2.94 V and a conversion efficiency of 31% across a resistive 3.5 k Omega 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.