• The proposed dual-band filtering push-pull PA achieves a frequency ratio of approximately 5:1 by combining MSL and SIW filtering baluns in a hybrid-mode configuration.
• It operates at S-band (2.6–2.86 GHz) and Ku-band (13–13.65 GHz), delivering peak output powers of 36.8 dBm and 36 dBm, respectively, with a small-signal gain of 7 dB.
• The hybrid-mode filtering balun inherently suppresses even-order harmonics and provides out-of-band spurious rejection, eliminating the need for external harmonic filtering stages.
• The design demonstrates the integration and miniaturization advantages of hybrid-mode transmission lines, making it highly suitable for advanced 5G and radar communication systems.