A 26/38-GHz Dual-Band Filtering Balanced Power Amplifier MMIC for 5G Mobile Communications

This letter presents a 26/38-GHz dual-band filtering balanced power amplifier (PA) using 100-nm GaAs process. Dual-band branch-line couplers are proposed for the balanced PA, which also engage into the dual-band input–output impedance matching and provide out-of-band rejection simultaneously. The proposed PA achieves the saturation output power (
$P_{\text {sat}}$
) of 27.7/26.9 dBm, output 1-dB compression point (OP
$_{\mathrm {1\,dB}}$
) of 27.1/25.6 dBm, peak power-added efficiency (PAE) of 31.5%/22.8%, and small signal gain of 22.4/15.8 dB at 26/38 GHz. At frequencies of 12, 34, and 45 GHz, the small signal suppressions are 45, 54, and 40 dBc, respectively. In virtue of the high output power in 5G band n258/n260 and good out-of-band rejection, the proposed PA can be a potential candidate for 5G applications.