Hwang, Hoyong Kang, Byungjoo Lee, Soo Hyun Jang, Cheol-In Kang, Ji Yoon Park, Changkun 2024-01-20T09:35:11Z 2024-01-20T09:35:11Z 2021-09-05 2014-05-03 0920-5071 https://pubs.kist.re.kr/handle/201004/126800 In this study, we investigate the resonant frequency effects of an external coil for a wireless intraocular pressure (IOP) monitoring system. The phase difference of an IOP sensor is improved using the resonant frequency of the external coil. By means of phasor diagrams, we show that the phase difference is improved as the resonant frequency of the external coil approaches the resonant frequency of the IOP sensor. The IOP sensor and a multi-layered external coil are designed using microfabrication technology and an FR-4 printed circuit board, respectively. The resonant frequency of the external coil is varied using an additional capacitor and by changing the number of layers of the multi-layered inductor pattern. From the measured results, we successfully verify that the resonant frequency of the external coil improves the phase difference of the IOP sensor. English TAYLOR & FRANCIS LTD PRESSURE READOUT SYSTEM Resonance frequency effects of an external coil for IOP sensor applications Article 10.1080/09205071.2014.891951 1 JOURNAL OF ELECTROMAGNETIC WAVES AND APPLICATIONS, v.28, no.7, pp.790 - 801 JOURNAL OF ELECTROMAGNETIC WAVES AND APPLICATIONS 28 7 790 801 scie scopus 000333997500002 2-s2.0-84896316872 Engineering, Electrical & Electronic Physics, Applied Engineering Physics Article PRESSURE READOUT SYSTEM intraocular pressure MEMS external coil phasor diagram sensor resonance frequency