A 1.4-2.7-GHz analog MMIC vector modulator for a crossbar beamforming network

The design and performance of a monolithic 1.4-2.7-GHz vector modulator with analog amplitude and phase control are presented in this paper. A full 360/spl deg/ coverage range and a dynamic range greater than 13 dB is achieved by combining two out of three vectors 120/spl deg/ apart with variable amplitude. Amplitude control is performed by three sets of quasi-dual-gate MESFETs (two single-gate MESFETs in cascade) while the 120/spl deg/ shift among the vectors is achieved through LC filters covering the 1.4-2.7-GHz band. Since the active devices throughout the circuit are not working in saturation, large-signal models must be used in the simulations. The circuit is used as the matrix node element in an analog crossbar beamforming network (CBFN) and as the general-purpose wide-band vector modulator device.

[1]  K. C Ng,et al.  Electrical network theory , 1977 .

[2]  R.S. Pengelly,et al.  The Performance of GaAs Lumped Element Phase Shifters at S and C Band , 1983, 1983 13th European Microwave Conference.

[3]  Jesus Grajal,et al.  MMIC vector modulator for a crossbar BFN , 1996 .

[4]  W. R. Curtice,et al.  A Nonlinear GaAs FET Model for Use in the Design of Output Circuits for Power Amplifiers , 1985, 1985 IEEE MTT-S International Microwave Symposium Digest.

[5]  Y. Gazit,et al.  A Continuously Variable Ku-Band Phase/amplitude Control Module , 1981, 1981 IEEE MTT-S International Microwave Symposium Digest.

[6]  Robert Michael Sorbello,et al.  Advances in multibeam communications satellite antennas , 1990, Proc. IEEE.