Title :
Miniature Ka-band I/Q vector modulator using 3D-MMIC technology
Author :
Ng, C.Y. ; Chongcheawchamnan, M. ; Robertson, I.D.
Author_Institution :
Sch. of Electron. & Phys. Sci., Surrey Univ., Guildford, 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 × 0.9 mm2 and achieves exceptionally precise tuning response leading to a near-ideal square constellation plot, making the modulator suitable for advanced signal processing and modulation techniques.
Keywords :
MMIC; modulators; 38 GHz; 3D-MMIC process; 3D-MMIC technology; BCB dielectric; Bookham Technology; Caswell; TFMS lines; advanced signal processing; direct multilevel modulation; lumped-distributed technique; miniature Ka-band I-Q vector modulator; overlaid couplers; square constellation plot; Attenuators; Costs; Couplers; Dielectric substrates; Gallium arsenide; MMICs; Microwave devices; Microwave technology; Radar signal processing; Transmitters;
Conference_Titel :
Microwave Conference, 2003. 33rd European
Print_ISBN :
1-58053-834-7
DOI :
10.1109/EUMC.2003.1263021
