Planar Monolithics (PMI) Model PA-218-45-5-4W-SF is a 2 to 18 GHz power amplifier with 45 dB typical gain, a noise figure of 5 dB maximum and a saturated output power of 4 W minimum. Package size is 2.88" x 2.5" x 0.67" excluding connectors with SMA female connectors.  https://www.pmi-rf.com/product-details/pa-218-45-5-4w-24v-sff