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4×4 배열 합성 혼 안테나 및 고출력 마그네트론에 의한 방사전력 측정
고동옥,신재윤,우종명 한국ITS학회 2016 한국ITS학회논문지 Vol.15 No.5
본 논문에서는 배열 합성 혼 안테나를 설계하고 고출력 마그네트론을 연결하여 방사전력을 측정하였다. 제안된 안테나는 4×4 배열 합성 혼 안테나 특성을 바탕으로 후방 방사를 억제시키기 위해 합성 혼 개구면 상, 하단에 2단 단락구조물을 부착하여 빔폭 E-plane 8.86°, H-plane 7.35°, 전후방비 39.7 dB를 얻었다. 또한 배열된 마그네트론을 이용한 배열 혼안테나의 방사전력을 측정하기 위하여 도파관 어댑터를 설계하여 마그네트론과 혼 안테나를 연결 시켰고 고출력의 파워를 측정하기 위해 중간단에 에어갭을 넣은 마이크로스트립 라인 커플러를 설계하였다. 4×4 배열 합성 혼 안테나의 중앙에 4개의 마그네트론을 연결하여 측정한 결과 평균 방사 출력 0.063 W를 얻었다. In this paper, the array synthesis horn antenna was designed and measured a radiation power after connecting magnetron. The proposed antenna was designed on the basis of the 4×4 array synthesis horn antenna characteristics. For suppressing a back-lobe, 2 step short-stub structures were attached to synthesis horn aperture upper and lower. The designed antenna has FBR(Front to Back Ratio) of 39.7 dB. HPBW(Half Power Beam Width) of the E-plane and the H-plane are 8.86°and 7.35° each in the measurement. For measuring a radiation power of array antenna that use a magnetron, the waveguide adaptor was designed and connected magnetron with horn antenna. Also, microstrip line coupler that replace a dielectric material with an air gap was designed for measuring a high power. As a result, average radiation output power of the 4×4 array synthesis horn antenna that connect a four magnetrons had a 0.063W.
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고동옥(Dong Wook Ko),부석현(Seok Hyun Boo),함석종(Seok Jong Ham) 한국관광연구학회 2010 관광연구저널 Vol.24 No.3
The purpose of this paper is to investigate the festivals such as Mt.Taebaek Snow Festival, Mt.Taebaek Azalea Festival, and Mt.Taebaek Cool Cinema in terms of festival evaluation methodology. The festivals mentioned above are held annually and evaluated regularly. However, the festivals have been analyzed, respectively, not synthetically. Therefore, in this paper we tried a comprehensive and synthetic analysis of those festivals, expecting a significant result from this research. Especially, we regard the Taebaek region as an upper group, applying the same test to data analyses in comparison of the satisfaction degrees toward the evaluation factors of the three festivals. In this paper we also tried to find the problems from the festival managements and to make some suggestions for improvement, thus coming up with a comprehensive solutions to the Taebaek festivals. The findings are as follows: First, the seven evaluation factors such as entertainment, event variety, experience, cultural understanding, product variety, product quality, and product price are examined through correlation analysis and regression analysis. Second, the seven factors are found statistically significant because the significance probability turned out to be 0.000<α=0.05 except the significance probability of Mt.Taebaek Cool Cinema which is 0.001<α=0.05 for the product price factor. Finally, in this paper we found that Mt.Taebaek Snow Festival using the highest budget among the three festivals faces the lowest regression coefficient for the entertainment factor, compared to the other two festivals such as Mt.Taebaek Azalea Festival and Mt.Taebaek Cool Cinema. This means the urgent needs to improve the festival management and to strengthen the festival program development and research.
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주차장관리 시스템 기지국용 소형 λ/4 폴디드 마이크로스트립 안테나
금재민,고동옥,정재엽,우종명 한국ITS학회 2016 한국ITS학회논문지 Vol.15 No.2
본 논문에서는 주차장관리 시스템 기지국용 소형 λ/4 폴디드 마이크로스트립 안테나를 제안, 설계 및 제작하였다. 제안된 안테나를 소형화하기 위해 먼저 기준 λ/2 마이크로스트립 패치 안테나에서 방사소자 폭을 줄이고, 다음은 방사소자 길이를 줄여주기 위하여 섭동효과(Perturbation effect)를 이용하여 개구면에 폴디드 구조를 적용하였다. 끝으로 λ/2 길이의 폴디드 마이크로스트립 안테나를 λ/4 폴디드 마이크로스트립 안테나로 더욱 소형화시켰다. 설계된 안테나는 중심주파수 425 MHz에서 크기는 134 mm × 143.85 mm × 20.1 mm(0.19λ × 0.2λ × 0.028λ, λ는 425 MHz의 한 파장 길이)로 기본 마이크로스트립 패치 안테나와 비교하여 97.2% 소형화 되었다. 또한 -10 dB 대역폭은 2.44 MHz(0.57%)로 측정되었으며 방사패턴은 E-plane 15o에서 최대 1.82 dBi의 이득을 얻었다. In this paper, miniaturized λ/4 folded microstrip antennas is presented for parking monitoring base station system. The proposed antenna reduced a width of the radiating element for miniaturizing a size and we changed an aperture such as folded shape for reducing a length of the antenna by the pertubation effect by reducing a width of the antenna. Finally, the λ/2 length of the folded microstrip antenna to λ/4 folded microstrip antenna was miniaturized by reducing the length. The proposed antenna was designed to receive 425 MHz of center frequency that can be used without permission. Dimensions are 134 mm × 143.85 mm × 20.1 mm(0.19λ × 0.2λ × 0.028λ, λ is wavelength at 425 MHz) that are compared with basic microstrip patch antenna miniaturized 97.2%. Also, Measured –10 dB bandwidth was 2.44 MHz(0.57%). On the other hand, measured radiation patterns was 1.82 dBi at E-plane 15o.
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