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

In this letter, an X-band expandable reconfigurable 1:2 power divider switch (PDSW) is proposed for switched beam-forming 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): 1) a $\lambda $ /4 TL of $50\sqrt {2} \; \Omega $ and 2) a TL of $50 \; \Omega $ . This enables the PDSW to realize three port states of two corresponding modes, including single-pole–double-throw (SPDT) mode and power divider (PD) mode. The PDSW has the ability to be expanded to an N-stage 1: $2^{N}$ matrix with $2^{2^{N}} - 1$ states. The proposed design is fabricated with a 0.10- $\mu $ m GaAs pHEMT process. The measurement results show a $\leq 1$ .2-dB insertion loss (IL), a $\geq $ 10-dB return loss (RL), and a $\geq 40$ -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.