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MIC화 PIN다이오드 하이브리드형 이상기의 설계에 관한 연구
김태회,박의준,박정기 한국통신학회 1987 韓國通信學會論文誌 Vol.12 No.4
Microwave integrated circuit phase shifters have undergone remarkable development to satisfy the fast and precise phase control requirements for phased array antennas. It is shown how relection type phase shift circuits using PIN diode can be analyzed and implemented so as to derve design equations for any phase shift. The reflection properties are achieved by the use of an impedance transforming two-port network and the virtual matching impedance method. Experimental and theoretical performance of 2-bit hybrid phase shifter designed by this method are found to be in good agreement for each bit. PIN 다이오드를 利用한 反射形 移相器는 4端子網 임피던스 變換回路로 構成될 수 있는데 원하는 移相量을 얻기위한 設計方程式 誘導에 假想 임피던스法을 적용하였다. 실제로 2-bit($22.5^{\circ}$와 $45^{\circ}$)하이브리드 移相器를 設計 具現하여 中心周波數(10GHz)에서 $22.5^{\circ}$bit는 $0.5^{\circ}$, $45^{\circ}$bit는 $0^{\circ}$의 移相量 誤差의 것을 얻었으며 main beam 制御用 phased-array안테나를 위한 移相器設計에 이 方法을 사용할 수 있음을 立證하였다.
이재록 ( Jae Rok Lee ),김태회 ( Tae Heui Kim ),박경봉 ( Kyung Bong Park ),김창호 ( Chang Ho Kim ),유재욱 ( Jae Uk You ),박문철 ( Moon Cheol Park ),이동오 ( Lee Dong-oh ) 한국폐기물자원순환학회 2008 젊은 연구자 학술연구발표회 Vol.7 No.0
Characteristics of ground granulated blast-furnace slag, such as chemical composition, surface area, particle size and distribution, particle shape were investigated for replacement of cement. And properties of cement mortars with three types of ground granulated blast-furnace slags, such as flow value, flow value ratio, compressive strength and activity indices were investigated.