• Title/Summary/Keyword: compact embedding

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Improved Performance of Microstrip Antenna using the Compact Photonic Band-gap Structures (소형 포토닉 밴드갭 구조를 이용한 마이크로스트립 안테나의 성능 향상)

  • Kim Young-Do;Lee Hong-Min
    • Journal of the Institute of Electronics Engineers of Korea TC
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    • v.43 no.5 s.347
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    • pp.147-155
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    • 2006
  • In this paper, we propose a new Mushroom-like PBG concepts for designing with forbidden frequency band-gap at low frequency. These design rules are based on enhancing the capacitance per unit area using modified top-patch of mushroom PBG with no increase on the overall thickness of the substrate board. Also, in this paper, a new approach to suppress the surface wave from antenna is proposed by embedding compact mushroom PBG in the substrate. Comparisons between the results from a conventional patch antenna to a patch antenna on a PBG substrate show that the reduction in the surface wave level is remarkable. This can be observed in the radiation pattern and the maximum gain. The maximum gain for reference patch antenna is $6.43dB{\imath}$ at 5.37 GHz, while the maximum gain for the patch antenna with normal mushroom and vane mushroom PBG is $7.24dB{\imath}\;and\;7.53dB{\imath}$at 5.14 GHz. The back radiation is also considerably reduced; this will lead, of course, to an increase in the antenna efficiency.

Highly Miniaturized and Performed UWB Bandpass Filter Embedded into PCB with SrTiO3 Composite Layer

  • Cheon, Seong-Jong;Park, Jun-Hwan;Park, Jae-Yeong
    • Journal of Electrical Engineering and Technology
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    • v.7 no.4
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    • pp.582-588
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    • 2012
  • In this paper, a highly miniaturized and performed UWB bandpass filter has been newly designed and implemented by embedding all the passive elements into a multi-layered PCB substrate with high dielectric $SrTiO_3$ composite film for 3.1 - 4.75 GHz compact UWB system applications. The high dielectric composite film was utilized to increase the capacitance densities and quality factors of capacitors embedded into the PCB. In order to reduce the size of the filter and avoid parasitic EM coupling between the embedded filter circuit elements, it was designed by using a $3^{rd}$ order Chebyshev circuit topology and a capacitive coupled transformation technology. Independent transmission zeros were also applied for improving the attenuation of the filter at the desired stopbands. The measured insertion and return losses in the passband were better than 1.68 and 12 dB, with a minimum value of 0.78 dB. The transmission zeros of the measured response were occurred at 2.2 and 5.15 GHz resulting in excellent suppressions of 31 and 20 dB at WLAN bands of 2.4 and 5.15 GHz, respectively. The size of the fabricated bandpass filter was $2.9{\times}2.8{\times}0.55(H)mm^3$.

An Implementation of the Position Controller for Multiple Motors Using CAN (CAN 통신을 이용한 다중모터 위치제어기 구현)

  • Yi, Keon-Young
    • The Transactions of the Korean Institute of Electrical Engineers D
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    • v.51 no.2
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    • pp.55-60
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    • 2002
  • This paper presents a controller for the multiple DC motors using the CAN(Controller Area Network). The controller has a benefit of reducing the cable connections and making the controller boards compact through the network including expansibility. CAN, among the field buses, is a serial communication methodology which has the physical layer and the data link layer in the ISO's OSI (Open System Interconnect) 7 layered reference model. It provides the user with many powerful features including multi-master functionality and the ability to broadcast / multicast telegrams. When we use a microprocessor chip embedding the CAN function, the system becomes more economical and reliable to react shortly in the data transmission. The controller, we proposed, is composed of two main controllers and a sub controller, which have built with a one-chip microprocessor having CAN function. The sub controller is plugged into the Pentium PC to perform a CAN communication, and connected to the main controllers via the CAN. Main controllers are responsible for controlling two motors respectively. Totally four motors, actuators for the biped robot in our laboratory, are controlled in the experiment. We show that the four motors are controlled properly to actuate the biped robot through the network in real time.

A Design of a Full FPGA-based DC-motor Control and Monitoring System (Full FPGA 기반 DC 모터 제어 및 모니터링 시스템 설계)

  • Lim, Byung Gyu;Kang, Moon Ho
    • Journal of the Institute of Electronics and Information Engineers
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    • v.51 no.11
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    • pp.211-220
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    • 2014
  • In this paper a full FPGA-based and compact motor-control system is shown that makes it easy to control the motor and analyze the result data in real time with embedding not only a DC motor controller but also a TFT LCD interface in a single FPGA. Both a PID speed control module for a DC motor and a monitoring module for plotting real time graphs on to a TFT LCD are designed in a single FPGA, and the system validity is shown through simulation and experimental results. The FPGA used is xc3s400 and the entire system is designed by using the AD (Altium Designer). A PWM motor drive system is constructed by using MOSFETs for a DC motor 4-quadrant operations.

Principal Component analysis based Ambulatory monitoring of elderly (주성분 분석 기반의 노약자 응급 모니터링)

  • Sharma, Annapurna;Lee, Hoon-Jae;Chung, Wan-Young
    • Journal of the Korea Institute of Information and Communication Engineering
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    • v.12 no.11
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    • pp.2105-2110
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    • 2008
  • Embedding the compact wearable units to monitor the health status of a person has been analysed as a convenient solution for the home health care. This paper presents a method to detect fall from the other activities of daily living and also to classify those activities. This kind of ambulatory monitoring of the elderly and people with limited mobility can not only provide their general health status but also alarms whenever an emergency such as fall or gait has been occurred and a help is needed. A timely assistance in such a situation can reduce the loss of life. This work shows a detailed analysis of the data received from a chest worn sensor unit embedding a 3-axis accelerometer and depicts which features are important for the classification of human activities. How to arrange and reduce the features to a new feature set so that it can be classified using a simple classifier and also improving the classification resolution. Principal component analysis (PCA) has been used for modifying the feature set and afterwards for reducing the size of the same. Finally a Neural network classifier has been used to analyse the classification accuracies. The accuracy for detection of fall events was found to be 86%. The overall accuracy for the classification of Activities or daily living (ADL) and fall was around 94%.