An X-Band Expandable Reconfigurable 1:2 Power Divider Switch for Switched Beam-Forming Networks in 0.10-μm GaAs Process

In this paper, an X-band expandable reconfigurable 1:2 power divider switch (PDSW) is proposed for switched beamforming networks. A switched inductor-artificial transmission line (SI-ATL) is proposed. With proper switch logic, the SI-ATL features two types of transmission line (TL): a λ/4 TL of 502 Ω and a TL of 50 Ω. This enables the PDSW to realize three port states of two corresponding modes, including single-pole doublethrow (SPDT) mode and power divider (PD) mode. The PDSW has the ability to be expanded to an N-stage 1:2N matrix with 22N -1 states. The proposed design is fabricated with a 0.10-μm GaAs pHEMT process. The measurement results show a ≤1.2 dB insertion loss (IL), a ≥ 10 dB return loss (RL), and a ≥ 40 dBm input 3rd-order intercept points (IIP3), in both modes. The isolation is 27-32 dB for SPDT mode and 14-31 dB for PD mode.