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주병국(Byung-Guk Ju),민동현(Dong-Hyun Min),윤금노(Keum-Ro Yoon),소드놈체렌 오논치멕(Onochimeg Sodnomtseren),안병철(Bierng-Chearl Ahn) 한국정보기술학회 2010 한국정보기술학회논문지 Vol.8 No.8
In this paper, a miniaturized and printed Yagi antenna is proposed for use in ZigBee communications. The proposed antenna consists of a bent dipole driver, five directors, a reflector and a feed line with a balun. The antenna is fed by a GCPW whose plane also acts as a reflector. The antenna performance versus design parameters is analyzed using a commercial software, from which an optimum design is derived. The designed antenna is fabricated on a 33×80×1㎜ FR-4 substrate and its performance is tested. The fabricated antenna has a gain of 4.0㏈i at 2.45㎓ and a reflection coefficient of less than -10㏈ over 2.31-2.55㎓.
김은주(Eun-Ju Kim),주병국(Byung-Guk Ju),방재훈(Jea-Hoon Bang),안병철(Bierng-Chearl Ahn) 한국정보기술학회 2009 한국정보기술학회논문지 Vol.7 No.5
In this paper, a printed yagi antenna is proposed for ZigBee applications at 2.4㎓. The antenna dimension is optimized using commercial electromagnetic software MWS by CST. The performance is verified through fabrication and measurement. The fabricated antenna has a reflection coefficient less than -10㏈ and a gain of 8.7㏈i at 2.33-2.50㎓.
UHF 대역 RFID 리더기 전자파에 대한 전기뇌관의 안전성
바체른 샤라부삼부(Batseren Sharasambuu),주병국(Byung-Guk Ju),이제선(Je-Sun Lee),방재훈(Jae-Hoon Bang),안병철(Bierng-Chearl Ahn) 한국정보기술학회 2009 한국정보기술학회논문지 Vol.7 No.6
As the use of radiowaves becomes widespread, the radio-frequency identification (RFID) technology finds applications in production, management, logistics and marketing of ammunition. Accordingly, the safety of the electric detonator becomes an important issue. In this paper, we measure and model the electric field intensity from a 910㎒ RFID reader for various distances from the reader. From the result, we analyze the safety of the electric detonator. From test resutls, we find that an externally exposed electric detonator will be safe if it is separated from a 910㎒ 0.5W portable RFID reader by at least 160㎝.