1. A microwave imaging system, comprising: a microwave source for providing microwave illumination to illuminate a target; a microwave receiver for receiving reflected microwave illumination reflected from said target; an antenna array including a plurality of antenna elements, each of said antenna elements being capable of being programmed with a respective transmission coefficient to direct said microwave illumination towards a position on a target, said antenna elements being further capable of being programmed with a respective additional transmission coefficient to receive reflected microwave illumination reflected from said position on said target and direct said reflected microwave illumination towards said microwave receiver; and a processor operable to measure an intensity of said reflected microwave illumination to determine a value of a pixel within an image of said target constructed by said processor.