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이문수,김진생 慶尙大學校 工科大學 自動化및컴퓨터應用技術硏究所 1996 自動化 및 컴퓨터應用技術 Vol.3 No.1
In this paper, we study on the microstrip antenna element showing the circularly polarized properties required for receiving the satellite broadcasting. We design a single-fed microstrip antenna, which radiates a circularly polarized wave without using an external polarizer. We can minimize the radiation loss in the feeding network of the microstrip antenna by the single-fed method and generate a left-handed circularly polarized wave by using a corner-truncated square microstrip patch. This antenna operates at the frequency of 11.74∼11.94㎓ and has the axial ratio of 0.24㏈ and the bandwidth of 720㎒. Therefore, this antenna can be used as a basic radiating element of large array antenna for receiving the satellite broadcasting.
SR 급전법을 이용한 무궁화 위성방송 수신 안테나 설계
이문수,김진생 慶尙大學校 工科大學 自動化및컴퓨터應用技術硏究所 1996 自動化 및 컴퓨터應用技術 Vol.3 No.1
In this paper, a microstrip array antenna for receiving KOREASAT broadcasting is designed, which has left-handed circularly polarization property with 29㏈ of gain at 11.84㎓. We design the array antenna using the sequential rotation feeding method to obtain the broad bandwidth and high efficiency. The 2×2 array is a basic array element to achieve the overall 16×16 array. All the elements of the array are fed in phase using the parallel feed method for broadside beam radiation. The actual dimension of array is about 30×30㎝. The measured return loss and VSWR is in a good agreement with the calculations. The measured results are as follows ; SLL of -15㏈ below, gain of 17∼20㏈, directivity of 24∼26㏈i, and axial ratio of 3.17㏈ at 11.84㎓.
閔丙亨,金佳鉉,金震生 東亞大學校 海洋資源硏究所 1988 硏究論文集 Vol.1 No.1
The object of this study is to figure out charactristics on the deformation Haeundae beach through a statistical analysis by using leveling and water depth surveys which were carried out seven times. The result of the analysis is shows that a depositional summer-type-beach is built up from spring to summer and a erosional winter-type-beach up from fall to winter. From the analysis it can be concluded that the erosion is affected by moving drift sands along on-offshore direction and the deposition is affected by those along the longshore direction. Therefore, the most suitable protection method in Haeundae beach would be Zetty, Head-land or a composition structure incorporating detached breakwater method which is the suitable method for the protection of erosion along the longshore direction.
무궁화 위성방송 수신용 고이득 마이크로스트립 배열안테나의 설계
김진생,신현철,이문수 慶尙大學校生産技術硏究所 1996 生産技術硏究所論文集 Vol.12 No.-
In this paper, a microstrip array antenna for receiving KOREASAT broadcasting is designed, which has left-handed circularly polarization property with the gain of 29dB at 11.84GHz. An antenna using a single feed point is chosen as an array element because of its simplicity and low feeding loss. The 2 X 2 array is a basic array element to achieve the overall 16 X 16 array antenna. All the elements of the array are fed in phase using the parallel feed method for broadside beam radiation. The actual dimension of array is about 30 X 30cm. The measured return loss and VSWR is in a good agreement with the calculations. The measured results are as follows ; SLL of -15dB below, gain of 27dB, directivity of 31.9dBi, and axial ratio of 0.74dB at 11.84GHz.
이진선,정민길,김진생,이정남,강치운,이우수,이문수 한국전자파학회 1997 한국전자파학회논문지 Vol.8 No.1
빔폭 $10^{\circ}$, 경사각 $80^{\circ}$ 및 SLL -15 dB 이하인 직렬 급전형 마이크로스트립 배열 안테나를 설계한다. 직렬 급전형 배열은 모든 소자들을 고임피딘스인 전송선로로 상호 연결하고, 첫 번째 소자에서 급전하며, 정합부하로 종단된 진행파 안테나이다. 안테나의 방사패턴과 임피던스 정합은 인쇄된 안테나 및 배열을 설계하는데 널리 사용 되는 소프트웨어 패키지인 앙상블 4.0에 의해서 해석한다. 빔의 경사각은 소자간의 간격에 의해서 구현된다. 직렬 급전형 배열 안테나는 병렬급전구조에 비하여 급전회로망이 간단하고 급전회로망에서의 방사손실이 작은 이점이 있다. 안테나는 두께 62 mil인 RT/Duroid 기판상에 제작한다. 실험결과 이론치와 실험치가 일치함을 확인하였다. A series-fed microstrip array antenna of beamwidth $10^{\circ}$, squint angle $80^{\circ}$ and SLL -15 dB below is designed. Series-fed arrays are formed by interconnecting all the elements by high-impedance transmission lines and feeding the power at the first element and it is a traveling-wave antenna which is terminated with a matched load. Radiation patterns and impedance matching of the antenna are analyzed by Ensemble 4.0, which is a popular software package for designing printed antennas and arrays. The squint angle of beam can be controlled by the spacing between the elements. The major advantages of series-fed array antennas are that feed arangement is compact and the losses associated with the feeding network are less than those of a corporate feed type. The antennas are fabricated on the RT/Duroid Laminates of 62 mil thickness. The experimental results are very close to the specifications to be designed.