The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Apr. 06, 2010
Filed:
Dec. 20, 2005
Young-tae Kim, Daejeon, KR;
Han-cheol Ryu, Seoul, KR;
Min-hwan Kwak, Daejeon, KR;
Seung-eon Moon, Daejeon, KR;
Su-jae Lee, Daejeon, KR;
Kwang-yong Kang, Daejeon, KR;
Young-Tae Kim, Daejeon, KR;
Han-Cheol Ryu, Seoul, KR;
Min-Hwan Kwak, Daejeon, KR;
Seung-Eon Moon, Daejeon, KR;
Su-Jae Lee, Daejeon, KR;
Kwang-Yong Kang, Daejeon, KR;
Electronics and Telecommunications Research Institute, Daejeon, KR;
Abstract
Provided are a phase shifter with a photonic band gap (PBG) structure using a ferroelectric thin film. The phase shifter includes a microstrip transmission line acting as a microwave input/output line and a plurality of tunable capacitors arranged in the microstrip transmission line at regular intervals. Electrodes disposed on a substrate apply DC voltages to the plurality of tunable capacitors. Radio frequency (RF) chokes and quarter wavelength radial-stubs are connected between the electrodes and the microstrip transmission line in order to prevent high frequency signals from flowing into a DC bias terminal. A plurality of PBGS are periodically arrayed on a ground plane of the substrate.