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Study of Nano-structure Coupling Micro-ScaleAntenna for Signal and Power Transmission using Magnetic Induction to an Implanted Device in the Human Body

Title
Study of Nano-structure Coupling Micro-ScaleAntenna for Signal and Power Transmission using Magnetic Induction to an Implanted Device in the Human Body
Translated Title
나노기술을 활용한 인체삽입형 무선 임플란트 자기장 무선전력 송수신 시스템 연구
Authors
Kang, Jong Gu
DGIST Authors
Kang, Jong Gu; Jang, Jae Eun; Hong, Jung Il
Advisor(s)
Jang, Jae Eun
Co-Advisor(s)
Hong, Jung Il
Issue Date
2014
Available Date
2016-05-18
Degree Date
2014. 2
Type
Thesis
Keywords
Magnetic InductionMagnetic coreNano wire자기장자심나노 와이어
Abstract
Currently, communication systems using radio frequency (RF) are the mainstream of functional devices. In the case of wireless communication devices such as mobile phones, tablet PCs, and medical devices, they can transmit an electrical signal from one device to another without a wire connection. However, this tech-nology is not suitable for the power transmission due to limitations such as low power efficiency and noise caused by interference from outside objects. Furthermore, the path loss is more severe when RF technology is applied to power transmission between an implanted human sensory system and external interfaces to transfer power, since 80 % of the human body is composed of water molecules. To overcome these limita-tions, this study focuses on magnetic induction (MI) system, which uses magnetic coupling of a pair of coils to transmit signals and power between devices. For magnetic fields, the path loss of water or other liquid media is smaller than that of RF waves. So far, most research results related with magnetic induction system have shown power transmission using macro-size coil structures. However, medical implant devices have the limit of the physical dimensions which requires the coil structure as small as possible. Unfortunately, a mi-cro-size antenna can have poor transmittance efficiency due to its size effect. Therefore, micro-size antennas with advanced structures should be investigated to overcome these challenges. This paper describes the coil designs and the characteristics of power transmission between a transmitter (Tx) and a receiver (Rx). To en-hance the magnetic inductance, a three dimensional magnetic core consisted of ZnO nano wires coated by a nickel (Ni) layer is added to the center of antenna structure. ZnO nano wires easily supply a large effective surface area with a vertical structural effect to the magnetic core structure, which induces a higher magnetic inductance with a ferro-magnetic material Ni. The magnetic induction coil with the magnetic core shows a high inductance value, a low reflection power and a strong power transmission. ⓒ 2014 DGIST
Table Of Contents
Ⅰ. INTRODUCTION 1 -- 1.1 Motivation 1 -- 1.2 History of power transmission 2 -- 1.3 Background principles of wireless power transmission 5 -- 1.3.1 Radio frequency (RF) system 5 -- 1.3.2 Magnetic Induction (MI) system 6 -- 1.3.3 Magnetic Resonance (MR) system 7 -- 1.4 Theory of magnetic field 9 -- 1.5 Antenna structure for power transmission 10 -- 1.5.1 Coil design 10 -- 1.5.2 Magnetic core (MC) structure 13 -- Ⅱ. EXPERIMENT DETAILS 16 -- 2.1 Fabrication of the basic coil 16 -- 2.2 Designing magnetic core (MC) structure 19 -- 2.3 Experiment condition 20 -- Ⅲ. RESULTS AND DISCUSSION 22 -- 3.1 Results of micro size antennas for the magnetic induction (MI) 22 -- 3.2 Electrical characteristics of basic coils 25 -- 3.2.1 Theoretical values of an inductance 25 -- 3.2.2 Measurement values of resistances and inductances 27 -- 3.2.3 Measurement values of a self-resonant frequency 29 -- 3.3 Electrical characteristics of magnetic core (MC) coils 32 -- 3.4 Power transmission 37 -- 3.4.1 In the air 37 -- 3.4.2 In the water 38 -- 3.4.3 The effect of matching a resonant frequency and impedance 39 -- 3.4.4 The effect of the power transmission over changing frequencies 41 -- 3.4.5 Matching a resonant frequency at Rx 42 -- IV. CONCLUSION 44
URI
http://dgist.dcollection.net/jsp/common/DcLoOrgPer.jsp?sItemId=000002262535
http://hdl.handle.net/20.500.11750/1343
DOI
10.22677/thesis.2262535
Degree
Master
Department
Information and Communication Engineering
University
DGIST
Files:
Collection:
Information and Communication EngineeringThesesMaster


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