Title :
Passive broadband millimetre-wave uniplanar MMIC balun
Author :
Wang, Chingyue ; Fusco, Vincent F.
Author_Institution :
Inst. of Electron., Commun. & Inf. Technol. (ECIT), Queens Univ. of Belfast, Belfast
Abstract :
A new uniplanar monolithic microwave integrated circuit (MMIC) balun using lumped circuits is presented. The proposed planar balun consists of a wideband Wilkinson power divider and a broadband 180deg phase shifter using novel series and parallel LC reflective terminating circuits. To demonstrate the design methodology, a 24-44 GHz MMIC balun was realised as a 1.4 mm GaAs chip. The measured return losses for the unbalanced and balanced ports are better than -12, -10 and -7 dB, respectively. The measured amplitude and phase imbalance between the two output ports are less than 0.5 dB and 7deg, respectively, and maximum insertion loss is 5 dB.
Keywords :
MMIC; baluns; broadband networks; passive networks; frequency 24 GHz to 44 GHz; phase shifter; planar balun; uniplanar monolithic microwave integrated circuit; wideband Wilkinson power divider;
Journal_Title :
Electronics Letters
DOI :
10.1049/el:20082272