Abstract
This brief presents a dual-band tunable concurrent passive phase shifter monolithic microwave integrated circuit utilizing a two-stage dual-branch phase tuning network topology. The designed phase shifter with two independent phase tuning bands operates at 5.9 GHz and 16 GHz. The dual-band phase shifter is fabricated in a $0.25~\mu \text{m}$ GaAs process and occupies a small chip area of 0.98 mm2 (including pads). Measurement results show that transmission phases in the two frequency bands can be tuned concurrently. Phase tuning range is greater than 105° in either band. Insertion losses of less than 2.8 dB and 3.5 dB are exhibited in 5.8~6 GHz and 15.8~16.2 GHz, respectively. And amplitude imbalances within the whole phase tuning range in 5.8~6 GHz and 15.8~16.2 GHz are less than 1.1 dB and 1.3 dB, respectively. The return losses are greater than 10 dB in both frequency bands. The phase shifter is employed in a four-element dual-band phased array network. The phased array is able to independently tilt its main beam toward −20° ~ +20° in either band.
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