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서무현(Mu-Hyun Seo),장리검(Li-Jian Jhang),안병철(Bierng-Chearl Ahn) 한국정보기술학회 2016 한국정보기술학회논문지 Vol.14 No.8
This paper presents a 2.45-GHz shorted patch antenna suitable for the ZigBee communication in railway environments. The proposed antenna consists of a shorted patch fed by a coaxial line, an 1-mm thick FR-4 substrate radome with the patch printed on the back surface and a metal cavity. The patch is shorted using one of the cavity walls and matched in impedance by connecting the coaxial probe at a suitable point in the patch length direction. The length and width of the patch are 27.6mm(0.225λ<SUB>0</SUB>) and 21.0mm(0.172λ<SUB>0</SUB>) respectively. The whole antenna structure including the metal cavity and the coaxial feed line is optimized, fabricated and measured. Measurements show that the proposed antenna has a 4.0-dBi gain at 2.45GHz and a reflection coefficient of less than -10dB at 2.375-2.525GHz.
2.4-GHz ZigBee 통신용 원편파 패치 안테나 최적 설계 및 구현
홍기표(Ki-Pyo Hong),노재우(Jae-Woo Noh),서무현(Mu-Hyun Seo),안병철(Bierng-Chearl Ahn) 한국정보기술학회 2016 한국정보기술학회논문지 Vol.14 No.8
A communication path between a sensor node installed underneath a railway cabin and a sensor node installed inside a cabin is a non-line-of-sight link with a high degree of polarization rotation, in which case circularly polarized antennas are advantageous. This paper presents a circularly-polarized patch antenna for a ZigBee sensor node operating inside a railway cabin. The proposed antenna consists of a rectangular patch, a patch feed circuit, and a metal case. An FR-4 circuit board is employed as a radome by using it as a lid of the metal case and by printing the patch on its backside. The patch feed circuit is realized with a power divider and a 90° phase delay line in a GCPW having low radiation and placed beneath the patch circuit board. Measurements show that the proposed antenna has a gain of 7.5dB and an axial ratio of 3dB at 2.45GHz, and a reflection coefficient of less than -10dB at 2.4-2.5GHz.
서주영,서무현,안병철 충북대학교 컴퓨터정보통신연구소 2015 컴퓨터정보통신연구 Vol.23 No.2
This paper presents a design of a wideband dual-polarized patch antenna operating at the VHF band. The designed antenna consists of a four-slitted patch at four points by capacitive coupling and a parasitic patch. A wideband performance of the antenna is obtained by increasing the distance between the fed patch and the ground plane, and a parasitic patch. The designed antenna has a gain of 4.4dB at 200MHz and a reflection coefficient of less than -6dB over 165-260MHz.