The Department of Defense (DoD) is seeking proposals for a Compact High Power Microwave Antenna. The objective of this SBIR is to design, build, and test high frequency, high gain antennas for High Power Microwave (HPM) applications. The goal is to develop a phased array antenna suitable for HPM sources at GW power levels that are broadband with minimal sidelobes. The antenna should be able to cover the entire X-band (8-12 GHz) with a wide bandwidth and high gain. The Phase I awardee must demonstrate a phased array antenna with a threshold gain of 24 dBi and an objective gain of 30 dBi across the X-band frequencies. The antenna should be phase steerable with at least plus or minus 20 degrees in both azimuth and elevation. The awardee must also create models of improvement in performance, analyze tradeoffs, and correlate manufacturing and materials development with modeling. In Phase II, the awardee will design, build, and demonstrate a single element of the phased array antenna and work on improving the full array design. In Phase III, the awardee will design, build, and demonstrate a module of at least 5 elements suitable for incorporating into the full array. The awardee will provide a complete technical data package and explore potential dual-use applications. The project duration is not specified, and funding specifics can be found on the solicitation agency's website.