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The MRF914 from Microsemi is a RF Transistor with Frequency 4500 MHz. More details for MRF914 can be seen below.
450 Watt, 50 Volt, 3.1 to 3.5 GHz, GaN RF IMFET
15 Watt, 50 Volt, DC to 4 GHz, GaN RF Transistor
You can now find similar products from multiple companies on everything RF.