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정용선,자르갈사이칸 나이암바얄,신봉섭,고형석,안병철 한국정보기술학회 2014 한국정보기술학회논문지 Vol. No.
This paper proposes a near-field RFID reader antenna based on a loop. The proposed antenna consists of a loop loaded with inductors and resistors, a top ground plane for adjusting the far-field gain, a balun and a metal housing. The near magnetic field is generated by a loop consisting of a circular wire and two orthogonal linear wires. Four inductors are placed on the loop to reduce the loop size and four resistors are used to obtain an impedance matching and to control the near magnetic field strength. A ground plan is placed around the loop to reduce the far-field gain of the antenna. A special balun structure is employed to reduce the radiation from the feeding coaxial cable. The loop and the feeding coaxial cable are placed in a metal housing to produce the near magnetic field only in the region just above the antenna. The antenna is optimally designed using a commercial software, then fabricated and tested. The fabricated antenna has a reflection coefficient less than -10dB over 903-921MHz, a far-field gain of -14.5dB, an H-field of 0.38A/m at 40mm above the antenna surface and a tag read distance up to 630mm when a power of 25dBm is supplied to the antenna. 본 논문에서는 루프를 이용한 근거리 RFID 리더 안테나를 제안하였다. 제안된 안테나는 인덕터와 저항으로 장하된 루프, 원거리 이득 조정용 상부 접지판, 벌룬 및 금속 하우징 등으로 구성된다. 근거리 자기장은 원형 도선과 2개의 교차 도선으로 구성된 루프에 의해 생성된다. 루프 상에 4개의 인덕터를 배치하여 루프의 크기를 소형화하였으며 4개의 저항을 사용하여 임피던스 정합을 얻고 동시에 근거리 자기장 세기를 조정하였다. 루프 주위에 접지판을 배치하여 안테나의 원거리 이득을 감소시켰다. 동축 급전선에 의한 방사를 억제하기 위해 특수한 벌룬 구조를 적용하였다. 근거리 자기장이 안테나 바로 위 영역에서만 생성되도록 루프와 급전 동축선을 금속 하우징 내에 설치하였다. 상용 소프트웨어를 이용하여 안테나를 최적 설계한 후 이를 제작하여 시험하였다. 제작된 안테나는 903-921MHz에서 -10dB이하 반사계수, -14.5dB의 원거리 이득을 보였으며, 25dBm의 전력 인가 시 안테나 표면으로 40mm 떨어진 위치에서 0.38A/m의 자기장 세기, 630mm의 태그 인식거리를 보였다.
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정용선(Yong-Sun Jung),자르갈사이칸 나이암바얄(Jargalsaikhan Nyambayar),신봉섭(Bong-Sup Sin),고형석(Hyung-Suk Koh),안병철(Bierng-Chearl Ahn) 한국정보기술학회 2014 한국정보기술학회논문지 Vol.12 No.8
This paper proposes a near-field RFID reader antenna based on a loop. The proposed antenna consists of a loop loaded with inductors and resistors, a top ground plane for adjusting the far-field gain, a balun and a metal housing. The near magnetic field is generated by a loop consisting of a circular wire and two orthogonal linear wires. Four inductors are placed on the loop to reduce the loop size and four resistors are used to obtain an impedance matching and to control the near magnetic field strength. A ground plan is placed around the loop to reduce the far-field gain of the antenna. A special balun structure is employed to reduce the radiation from the feeding coaxial cable. The loop and the feeding coaxial cable are placed in a metal housing to produce the near magnetic field only in the region just above the antenna. The antenna is optimally designed using a commercial software, then fabricated and tested. The fabricated antenna has a reflection coefficient less than -10dB over 903-921MHz, a far-field gain of -14.5dB, an H-field of 0.38A/m at 40mm above the antenna surface and a tag read distance up to 630mm when a power of 25dBm is supplied to the antenna.
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교차 다이폴을 이용한 이중 선형편파 반사경 안테나 피드 설계
사이르후 자활랑(Javkhlan Sharkhuu),자르갈사이칸 나이암바얄(Nyambayar Jargalsaikhan),신애령(Ailing Shen),안병철(Bierng-Chearl Ahn) 한국정보기술학회 2017 한국정보기술학회논문지 Vol.15 No.7
Dual-polarized reflector antennas are used in such applications as radar, radiometer, space radio observation, and communication. In this paper, a dual-polarized reflector antenna feed is proposed that employs crossed dipoles. The proposed feed consists of a cylindrical cavity, printed crossed dipoles and parasitic element, microstrip feed lines and baluns, and coaxial probes. Major design parameters of the feed are dipole length, dipole distance from the ground plane, dipole feed point, length and location of the parasitic dipole. An optimum design is obtained from the change of feed reflection coefficient versus design parameters of the feed. The designed feed has been fabricated and its characteristics have been measured. Measurements have shown that the proposed feed has reflection coefficient of less than -10dB and isolation of greater than 25dB -10dB beamwidth of 133° and 145° in E- and H-planes respectively at 1.9~3.0GHz.
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신봉섭(Bong-Sup Shin),정용선(Yong-Sun Jeong),김호진(Ho-Jin Kim),민재용(Jae-Yong Min),자르갈사이칸 나이암바얄(Jargalsaikhan Nyambayar) 한국정보기술학회 2015 한국정보기술학회논문지 Vol.13 No.1
This paper presents a small power divider for conformal array antennas on artillery projectiles. The proposed power divider distributes the power supplied to a 50Ω coaxial cable to 50NΩ coaxial outputs placed on the circumference of a circular printed circuit board. The proposed power divider has a structure where the input cable is connected to each output cable with a quarter-wave stripline impedance transformer with a characteristic impedance of 50 √NΩ. A via hole is utilized to connect the coaxial cable with the stripline. Parallel plate waveguide modes are suppressed by using grounded via holes around the stripline. The proposed structure is applied to the design of 1:2, 1:3 and 1:4 power dividers. A 1:2 power divider is fabricated to verify the validity of the design. Measurements show that the fabricated power divider has a bandwidth of 117% at S-band and a transmission coefficient of -3.10dB and -3.28dB at the center frequency.
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