Abstract: The present disclosure provides a Ka-band gallium-nitride (GaN) monolithic-microwave integrated circuit (MMIC) power amplifier circuit and an amplifier, and belongs to the field of MMIC amplifiers. The circuit includes: a plurality of cascade-connected amplification modules. A first amplification module includes a first amplification unit, and each of the other amplification modules includes a matching network unit and an amplification unit. A microstrip line ML1 in matching network unit includes one terminal connected to an output terminal of a front-stage amplification unit and the other terminal connected to one terminal of a microstrip line ML2 and one terminal of a capacitor C1. The other terminal of the microstrip line ML2 is connected to an input terminal of a current amplification unit. The other terminal of the capacitor C1 is grounded.

Abstract: In wireless communication systems and methods for high-speed mobility deployments, a mobility status of a communication device can be determined. For example, the speed at which the communication device is traveling can be determined (e.g. such as communication devices traveling on a high-speed transportation (HST) system). HST networks can be prioritized based on the determined mobility status of the communication device when performing a fallback communication and/or when returning from the fallback communication.