• Title/Summary/Keyword: wireless resonant frequency

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The High Efficiency Optimal Design of Resonant class Φ2 Inverter for short range wireless power transmission (근거리 무선전력 전송용 공진형 class Φ2 인버터 고효율 최적설계)

  • YANG, Haeyoul;PARK, Jaehyun;KIM, Changsun
    • Proceedings of the KIPE Conference
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    • 2011.07a
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    • pp.64-65
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    • 2011
  • The ac power conversion inverter provides the ac power to ECR device for wireless power transfer. In this paper, the operating efficiency of the class-${\Phi}_2$ resonant inverter has been studied through by experiment for optimal design. Its switching frequency is 1MH and the input voltage is 96V which is the output voltage of LLC resonant converter. And its output voltage is 230Vp-p. The efficiency is measured up to 84%.

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A Study on Fractal Antenna Design and Fabrication for Multi-Band Applications (다중대역용 프랙탈 안테나의 설계 및 제작에 관한 연구)

  • Kim, Kab-Ki
    • The Journal of the Institute of Internet, Broadcasting and Communication
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    • v.11 no.5
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    • pp.81-86
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    • 2011
  • In this paper, fractal microstrip patch antenna in a semicircle, by designing a multi-resonant antenna was improved by bandwidth issues, including the IEEE 802.11 wireless LAN and IEEE802.16e-band mobile WiMax specification both of which can contain non-directional antenna design and measured characteristics of the antenna for multi-resonant resonant frequency, impedance matching, radiation pattern, brilliantly polarity and multiple independent frequencies that can be controlled to meet the three semicircular wireless communications by inserting fractal patch antenna was designed.

Calculation of Induced Current in the Human Body by Magnetic Field in the 100kHz~10MHz Resonant WPT Frequency Range and Analysis of EMF Guideline (공진형 무선전력전송 대역의 100kHz~10MHz 자기장에 의한 인체유도전류계산과 전자기장 인체보호기준 분석)

  • Shin, Hansu;Song, Hye-Jin;Byun, Jin-Kyu
    • Journal of the Korean Institute of Illuminating and Electrical Installation Engineers
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    • v.27 no.2
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    • pp.110-119
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    • 2013
  • As the technologies such as middle-range resonant WPT (wireless power transfer) advance that utilizes medium and low-frequency magnetic field, the importance of safety of such magnetic field is growing. The research on the effect of electromagnetic field on the human body has been mainly done on the GHz range of mobile phones, or 50~60Hz range of electric power systems. However, there has been relatively few works on the 100kHz~10MHz range used in the resonant wireless power transfer. Since there is a difference in the limiting value of magnetic field between widely used ICNIRP EMF guideline and IEEE C95.1 standard, there can be possible confusion when establishing EMF (Electromagnetic Field) standard on the wireless power transfer device in the future. In this paper, the induced current in the human body, which is the basic restriction of the EMF guideline, is calculated using Quasi-static FDTD method when 3D high-resolution human model is exposed to the 100kHz~10MHz magnetic field. Using this result, the feasibility of the magnetic field reference level in the ICNIRP guideline is analyzed.

Differential Dual-Frequency Antenna for Wireless Communication

  • Han, Liping;Zhang, Wenmei;Han, Guorui;Ma, Runbo;Li, Li
    • ETRI Journal
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    • v.30 no.6
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    • pp.877-879
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    • 2008
  • A novel differential dual-frequency antenna using proximity coupling is proposed. Dual bands are realized by a slot in the ground plane. The lower resonant frequency is controlled by the slot in the ground plane, and the upper resonant frequency is mainly determined by the dimensions of the radiating patch. Measured results show that the proposed antenna can operate at 2.51 GHz and 5.38 GHz.

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Performance Analysis and Equivalent Circuit Extraction for Magnetic Resonance Type Wireless Power Transfer (자기공진방식 무선전력전송 등가회로 추출 및 특성 분석)

  • Park, Dae Kil;Kim, Young Hyun;Koo, Kyung Heon
    • Journal of Advanced Navigation Technology
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    • v.21 no.4
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    • pp.371-376
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    • 2017
  • In this paper, we propose a magnetic resonant WPT(wireless power transfer) scenario using a large coil resonating at 6.78 MHz, and compare the characteristics through a three-dimensional electromagnetic field simulation and a magnetic resonant WPT equivalent circuit. The magnetic resonant WPT equivalent circuit proposed in this paper considers the parasitic capacitance generated between the coils in addition to the conventional equivalent circuit. Based on this analysis, we fabricated the magnetic resonant WPT coil and compared it with simulation prediction. As a result of comparison, the transfer characteristics and the resonance frequency shift can be predicted. Error proposed characteristics of equivalent circuit for the magnetic resonant WPT and the measured values are estimated to be ${\Delta}{\mid}S11{\mid}=1.31dB$ and ${\Delta}{\mid}S21{\mid}=1.21dB$, respectively.

Design of ZOR antenna for 2.45GHz WLAN using CRLH-TL (CRLH-TL을 이용한 2.45GHz 무선랜용 ZOR 안테나 설계)

  • Kim, Seung-Hwan;Yu, Jin-Ha;Lee, Young-Soon
    • Journal of Advanced Navigation Technology
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    • v.16 no.5
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    • pp.773-780
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    • 2012
  • ZOR(zeroth order resonance) antenna for 2.45GHz WLAN(wireless local area network) is designed by use of CRLH-TL(composite right left handed transmission line) meta-material. The electrical length of conventional antennas is determined generally according to the resonant frequency, whereas that of ZOR antenna can be determined without reference to the resonant frequency. Therefore ZOR antenna has advantage in miniaturization of antenna in comparison with conventional antennas. In order to design such ZOR antenna, first unit cell with electrical length shorter than a quarter wavelength at 2.45GHz is designed to the some characteristics of homogeneous medium. In order to decrease resonant frequency and enhance frequency bandwidth, the proposed antenna is fed by CPW(co-planar waveguide) and short stub between radiation patch and ground plane is used for obtaining both higher inductance and smaller capacitance than previous mush-room type of CRLH-TL.

Novel Mutual Inductance Formula for the Magnetic Resonance Wireless Power Transmission System Using Helical Coils (헬리컬 코일을 이용하는 자기 공진형 무선 전력 전송 시스템에서 새로운 상호 인덕턴스의 계산식 제안)

  • Jang, Ju-Yeop;Hur, Jung;Kim, Yong-Nam
    • The Journal of Korean Institute of Electromagnetic Engineering and Science
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    • v.23 no.6
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    • pp.669-681
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    • 2012
  • In this paper, analytical calculations using a novel mutual inductance formula for a resonant wireless power transmission system using helical coils. The look-up table of critical variables during the mutual inductance calculation process was formulated. The calculation results for resonant frequency and insertion loss were compared with experimental results when the distance between the two helical coils in a structure where the transmission and reception is symmetrical was varied with 10 mm increments from 53 mm to 500 mm. On average, the resonant frequency showed a difference of 5.63 % between the experimental results and the calculation results. The insertion loss had an average difference 2.25 dB where the smallest difference of 0.33 dB occurred with 290 mm. It was found that the experimental results without using a balun were in greater agreement with the calculation results.

SAW Sensor Network Design and Reflected Waves Removal for Temperature Measurement (온도 센싱을 위한 SAW 센서 네트워크 설계 및 다중경로 반사파 제거)

  • Kyung-Soon Lee;Kyung Heon Koo
    • Journal of Advanced Navigation Technology
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    • v.27 no.4
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    • pp.469-472
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    • 2023
  • If temperature management is required in factory or environmental monitoring, temperature can be measured by connecting various sensors wired or wirelessly. Surface acoustic wave sensors measure temperature using changes in acoustic waves on the sensor surface according to temperature, and are useful for wireless networks. In this paper, in order to build a wireless temperature measurement system in the 900 MHz frequency band, the temperature characteristics of the passive SAW sensor were measured, and the analysis and removal of multipath reflection wave effect inside the high temperature chamber were conducted. The resonant frequency of the SAW sensor was measured, and radio transmission/reception and multipath reflected wave removal techniques were proposed in the shielded chamber.

Design of Two-Dimensional Resonant Wireless Power Transfer Using 90˚ Phase Shifted Inputs (90˚ 입력위상의 변화를 통한 2차원 무선전력전송 구현)

  • Kim, Sanghwan;Seo, Chulhun
    • Journal of the Institute of Electronics and Information Engineers
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    • v.52 no.2
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    • pp.70-74
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    • 2015
  • In this paper, two-dimensional resonant transmitter and receiver for WPT is designed and implemented using method that use $90^{\circ}$ phase shifted input power to orthogonal transmitter. Mutual inductance is minimized by using proposed each orthogonal coil of receiver and the method that inputs $90^{\circ}$ phase shifted power is used to radiate magnetic energy into two dimension. This method facilitates two dimensional resonant WPT by solving power efficiency degradation problem according to location in general WPT. The resonance frequency is 6.78 MHz and the distance between transmitting and receiving resonator is 200 mm. The transfer efficiency of the proposed wireless power transfer system is higher than 40 % at all direction.

Design and Fabrication of Aperture-Coupled Microstrip Cylindrical Dielectric Resonant Antenna for Wireless LAN (무선 LAN용 개구결합 마이크로스트립 원통형 유전체 공진 안테나 설계 및 제작)

  • 이권익;김흥수
    • The Journal of Korean Institute of Electromagnetic Engineering and Science
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    • v.12 no.3
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    • pp.425-431
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    • 2001
  • In this paper, on aperture-coupled microstrip cylindrical dielectric resonant antenna(DRA) consisting of dielectric material with permittivity ${\epsilon}_{r}$ = 36 is designed and fabricated fir wireless LAN. First of all, the feedline length, width, slot length and width of the feeding element were calculated using the theory of microstrip transmission line. Radiation element is designed using the theory of cylindrical dielectric cavity, Resonant frequency of the fabricated cylindrical DRA is 2.449 GHz and VSWR, return loss and bandwidth is 1.009, -47 dB and 70 MHz, respectively. Front-to-back radiation ratio is about 12 dB and 3 dB beamwidth of E-plane and H-plane is 110$^{\circ}$ and 90$^{\circ}$ , respectively.

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