Here are the KiCad files for some RF amplifier PCB designs.
Unless otherwise specified, the designs here are under the MIT license.
This is a 2.4 GHz TX and RX amplifier using a SE2611T WiFi front-end chip. It is intended to go between a LimeSDR and an antenna or a higher-powered WiFi booster amplifier.
It also includes TX/RX switching controlled by a power detector.
SE2611T was chosen because Tommi OH1GJV had several of them as surplus. The design hasn't been tested though, since the components and boards got lost somewhere.
This is a 400-440 MHz power amplifier using a M68710L RF power module. The module is old but they were really cheap at Lutikoiden tuuletus. With a nominal input power of 20 mW (13 dBm), it can be driven directly from common SDRs.
It is designed to be mounted on a heatsink, transferring heat through the PCB using a grid of vias under the amplifier module. This avoids the mechanical trouble of achieving a good RF contact between the PCB and the heatsink. At low duty cycles, it may even work without a heatsink.
Note that the PCB is 1 mm thick.