Abstract:
PURPOSE: A UHF(ultrahigh frequency) variable device with a ferroelectric/paraelectric barium-strontium-titanium oxide thin film is provided to reduce deformation or loss of data and decrease amplification of an electric wave that is radiated through an antenna by reducing a loss of the electric wave in an active antenna system or a satellite communication system. CONSTITUTION: A substrate(100) is prepared. The ferroelectric/paraelectric barium-strontium-titanium oxide thin film(110) of an orientation (111) is formed on the substrate by a laser deposition method. The substrate is a MgO substrate.
Abstract:
PURPOSE: An ultrahigh frequency Wilkinson power divider is provided to offset a parasitic element and improve a degree of isolation between output terminals at an ultrahigh frequency by using a compensation inductor and a compensation capacitor. CONSTITUTION: An ultrahigh frequency Wilkinson power divider includes a top dielectric layer, a bottom dielectric layer, a first compensation inductor, a first compensation capacitor, a second compensation inductor, and a second compensation capacitor. The top dielectric layer(301) and the bottom dielectric layer(300) are arranged at a top part and a bottom part of the Wilkinson power divider, respectively. The first compensation inductor is serially connected between an isolation resistor(306) and a first output line. The first compensation capacitor is serially connected among the first compensation inductor, the isolation resistor, and the second output line. The second compensation inductor is connected in parallel to both ends of the isolation resistor. The second compensation capacitor is connected in parallel to both ends of the isolation resistor and the second compensation inductor.
Abstract:
Provided is a microwave tunable device including a ferroelectric/dielectric (Ba1-x,Srx)TiO3 (BST) thin film that can reduce dielectric loss of a ferroelectric/dielectric BST thin film. The microwave tunable device of the present research includes: a substrate; and a ferroelectric/dielectric (Ba1-x,Srx)TiO3 (BST) thin film of a (111) direction which is formed on the substrate. The technology of this research embodies a microwave tunable device by using a ferroelectric/dielectric BST thin film grown in the (111) direction to overcome the limitation of conventional technologies and improve the problem of dielectric loss.
Abstract:
본 발명은 초고주파 윌켄슨 전력분배기(Wilkinson Power Divider)에 관한 것으로, 소정 임피던스(impedance) 값을 갖는 입력 선로(input line), 입력 선로에서 적어도 두 개 이상으로 나누어지는 제 1 및 제 2 트랜스포머 선로(transformer line), 제 1 및 제 2 트랜스포머 선로의 종단에 연결된 제 1 및 제 2 출력 선로(output line), 제 1 및 제 2 출력 선로들간에 연결되는 격리저항(isolation resistor)을 갖는 윌켄슨 전력분배기에 있어서, 윌켄슨 전력분배기의 상부 및 하부에 배치되며, 적어도 일종(一種) 이상의 복합 재료로 이루어진 상부/하부 유전체층과, 격리저항과 제 1 출력 선로간에 직렬로 연결되는 제 1 보상 인덕터(compensation inductor)와, 제 1 보상 인덕터, 격리저항 및 제 2 출력 선로간에 직렬로 연결되는 제 1 보상 캐패시터(compensation capacitor)와, 격리저항 양단에 병렬로 연결되� � 제 2 보상 인덕터와, 격리저항 양단과 제 2 보상 인덕터간에 병렬로 연결되는 제 2 보상 캐패시터를 포함한다. 본 발명에 의하면, 격리저항에 병렬 또는 직렬로 단독 또는 복합적으로 연결되는 보상 인덕터 및 보상 캐패시터를 구비함으로써, 초고주파대역에서 사용 가능한 초고주파 전력분배기의 회로구성 과정에서 발생하는 기생 성분(기생 인덕턴스, 기생 저항과 기생 캐패시턴스)을 상쇄하여 전력분배기의 성능 및 입출력 특성을 향상시킬 수 있다.