A 32-38GHz Full-360° Low-Phase-Error 6-bit Passive Phase Shifter in 0.15μm GaAs

A phase shifter is widely used in the phased array radar system and multi-beam antennas, which enables phased arrays for beam scanning by changing the phase of the corresponding radiating element. Based on GaAs
$\boldsymbol{0.15}\mu \mathbf{m}$
process, this work researches and designs a 32-38GHz 6-bit phase shifter, in which the overall size of the chip is 1.87 mm
$\times 1.5$
mm. The proposed phase shifter is designed using high and low pass filter types for
$\boldsymbol{180}^{\circ}$
and
$\boldsymbol{90}^{\circ}$
units. In order to alleviate the problem of too-large inductance and too-small capacitance, this work uses Low-pass and bypass filter types for
$\boldsymbol{45}^{\circ}, \boldsymbol{22.5}^{\circ}\boldsymbol{11.25}^{\circ}$
, and
$\boldsymbol{5.625}^\circ$
units. The RMS phase shift error of this 6-bit phase shifter is less than
$\boldsymbol{4}^{\circ}$
.