Abstract:
A dual‐band vector‐sum phase shifter with independent phase control of the 2.4 and
5 GHz Wi‐Fi bands is presented. The network uses band‐limited variable gain amplification,
with a broadband hybrid coupler at the input and an in‐phase recombiner at the
output. The circuit is prototyped on RF printed circuit board and exhibits performance
characteristics comparable to the state‐of‐the‐art single band vector‐sum phase shifters.
The prototype achieved an average gain of 2.16 dB over the 2.4 GHz band, with less than
0.26 dB and 1.32° root‐mean‐square (RMS) gain and phase error across all 2.4 and 5 GHz
band tuning states. In the 5 GHz band, an average gain of 0.17 dB is achieved, with less
than 0.21 dB and 3.88° RMS gain and phase error. The network's ability to generate bandindependent
vector modulation over a 12 dB/90° tuning range is demonstrated as well,
achieving less than 0.12 dB and 0.27° RMS gain and phase error in the 2.4 GHz band, and
less than 0.27 dB and 2.94° gain and phase error in the 5 GHz band.
