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WLAN/WiMAX 시스템 적용을 위한 DGS를 갖는 삼중대역 안테나 설계 및 제작
서나현,이영철,윤중한,Seo, Na-Hyun,Rhee, Young-Chul,Yoon, Joong-Han 한국정보통신학회 2017 한국정보통신학회논문지 Vol.21 No.4
본 논문에서는 DGS (Defected Ground Structure)를 적용한 WLAN/WiMAX 시스템에 적용 가능한 모노폴 안테나를 제안하였다. 제안된 안테나는 마이크로스트립 급전을 바탕으로 두 개의 선로와 DGS를 갖도록 구성하여 삼중대역 특성을 갖도록 설계하였다. 두 개의 선로 그리고 세 개의 슬릿의 위치 및 길이와 DGS 위치와 길이를 적절한 조정하여 본 논문에서 요구되는 특성을 얻기 위한 최적화 수치를 얻었다. 제안된 안테나는 $34mm(W_1){\times}34mm(L_1){\times}1.6mm(t)$의 비유전율 4.4인 FR-4 유전체 기판 위에 $17.0mm(W_6){\times}30.75mm(L_3+L_4+L_9)$의 크기로 제작되었다. 제작 및 측정결과로부터 -10 dB 임피던스 대역폭을 기준으로 360 MHz (2.335~2.695 GHz), 645 MHz (3.37~4.015 GHz) 그리고 1,770 MHz (5.14~6.91 GHz)의 대역폭을 얻었다. 또한 제안된 안테나는 요구되는 삼중대역에서 측정된 이득과 방사패턴의 얻었다. In this paper, a microstrip-fed triple-band monopole antenna with DGS (Defected Ground Structure) for WLAN/WiMAX applications was proposed. The proposed antenna is based on a microstrip-fed structure, and composed of two strip lines and DGS structure and then designed in order to get triple band characteristics. We carried out simulation about parameters. Adjusted the position and length of the two strips and three slits, we get the optimized parameters. The proposed antenna is fabricated on an FR-4 substrate of which the dielectric constant is 4.4, and its overall size is $34mm(W_1){\times}34mm(L_1){\times}1.6mm(t)$, and its proposed antenna size is $17.0mm(W_6){\times}30.75mm(L_3+L_4+L_9)$. From the fabricated and measured results, return loss of the proposed antenna satisfied return loss -10dB bandwidth 360 MHz (2.335~2.695 GHz), 645 MHz (3.37~4.015 GHz) and 1,770 MHz (5.14~6.91 GHz). And measured results of gain and radiation patterns characteristics displayed for operating bands.
서나현(Seo, Na-Hyun) 한국실내디자인학회 2011 한국실내디자인학회논문집 Vol.20 No.1
According to the recent expansion of Trade Shows within the government’s policy in exhibition industry, studies about the trade shows needs to be focused more on the attendees related to the environment. In most of the researches related to this topic until now had been biased in terms of economic benefits and the standpoint of organizers. Considering that this study is to improve environment of Trade Shows from an attendees’ point of view as an attempt to apply the concept of Service Design which is the activity of planning and organizing people, infrastructure, communication and material components of a service. It is about the idea of bringing service design principles to services in Trade Shows. Good design process brings in a good understanding of the context : understanding the environment and redefining problems from the standpoint of attendees, in order to improve its quality, the interaction between service provider and attendees and the attendees’ experience.
김동현(Dong-hyeon Kim),서나현(Na-Hyeon Seo),박기원(Ki-Won Park),이영철(Young-Chul Rhee) 한국지능시스템학회 2017 한국지능시스템학회논문지 Vol.27 No.2
본 논문에서는 650MHz에서 2,700MHz의 주파수 대역에서 우수한 동적영역과 선형성 특성을 나타내는 RF-수신기를 설계하고, 왜곡신호(누설 또는 혼변조)를 측정할 수 있는 지능형, 광대역 RF-왜곡신호 계측시스템을 구현하였다. 광대역 특성의 RF-수신모듈은 저 잡음특성과 동적영역 관계를 분석하여 RF수신단의 선형화 파라미터를 최적화시켰다. 지능형 디지털-왜곡(혼변조) 측정시스템에서는 측정하려는 왜곡(혼변조)신호를 PC상의 GUI 로 처리하여 원하는 계측파라미터를 PC 모니터에 나타내었다. 설계된 계측장치를 650MHz-2700MHz 까지 가변시켜 왜곡신호를 측정한 결과, -127.8dBc에서-138dBc까지 나타내어 지능형 디지털 계측기로 이용될 수 있음을 보였다. In this paper, we developed an intelligent and wideband RF-receiver module to represent a high dynamic range and good linearity characteristics up to 650MHz-2700MHz frequency band. and implemented an intelligent digital-RF- distorted signal measuring system for the RF distortion (intermodulation) signals. Broadband RF-receive module was designed to represent the optimized linear parameters of the receiver to meet the low noise and wide dynamic range. The designed intelligent digital-distortion(intermodulation) signal measument system measured by applying the 1MHz IF of third intermodulation signal of DUT and Measured data was recorded by program on the PC monitor with GUI interface. By variable up to 650MHz-2700MHz measured data showed up to-127.8dBc to -138dBc of the distortion (intermodulation) signal. And developed intelligent digital- distortion signal measurement system can be used to measure intermodulation distortion sign aolf wireless system widely.