Miniature Ka-Band I/Q Vector Modulator using3D-MMIC Technology

摘要

A 3D-MMIC I/Q vector modulator for directmultilevel modulation at 38GHz is reported. Theexperimental 3D-MMIC process developed at BookhamTechnology (Caswell) offers 5 metal layers with BCBdielectric, making it possible to miniaturise the passivecomponents using the lumped-distributed technique,overlaid couplers and TFMS lines. This approach offerscompactness and easy implementation as compared to theplanar forms. The modulator measures only 1.9 x 0.9mmand achieves an exceptionally precise tuning responseleading to a near-ideal square constellation plot, making themodulator suitable for advanced signal processing andmodulation techniques.