Title :
Miniature Ka-Band I/Q Vector Modulator using 3D-MMIC Technology
Author :
Ng, C.Y. ; Chongcheawchamnan, M. ; Robertson, I.D.
Author_Institution :
Microwave Systems Research Group (MSRG), Advanced Technology Institute, School of Electronics and Physical Sciences, University of Surrey, Guildford, GU2 7XH, UK
Abstract :
A 3D-MMIC I/Q vector modulator for direct multilevel modulation at 38GHz is reported. The experimental 3D-MMIC process developed at Bookham Technology (Caswell) offers 5 metal layers with BCB dielectric, making it possible to miniaturise the passive components using the lumped-distributed technique, overlaid couplers and TFMS lines. This approach offers compactness and easy implementation as compared to the planar forms. The modulator measures only 1.9 × 0.9mm2 and achieves an exceptionally precise tuning response leading to a near-ideal square constellation plot, making the modulator suitable for advanced signal processing and modulation techniques.
Keywords :
Circuits; Costs; Couplers; Dielectric substrates; Gallium arsenide; Microwave devices; Microwave technology; Power combiners; Power transmission lines; Transmitters;
Conference_Titel :
Microwave Conference, 2003 33rd European
Conference_Location :
Munich, Germany
Print_ISBN :
1-58053-834-7
DOI :
10.1109/EUMA.2003.341084
