For active microwave surveillance of earth surface and atmosphere, radar transceivers perform functions of probing the atmosphere and the surface conditions of the earth. The primary objective of Phase 1 is to establish a design baseline for a high-efficiency pulsed power amplifier MMIC/module operating at L-band frequency. Hittite has been working on development of L-band MMICs for all those functions and integration of the entire T/R module using an E/D PHEMT process. The transmitter power output of the current program is limited to about 2 watts. In Phase 2, the program objective should be expanded to include integration of the complete T/R module using the process compatible with the GaN amplifier design. The amplifier technology developed so far will be expanded to provide a design of a pulsed amplifier operating at the higher output level first. The second crucial part of this proposal is to establish a design baseline for pulsed power switches with power output capabilities at 300 watts at a max of 20% duty cycle.