In this paper, we review modern advances in microwave and millimeter-wave computational frequency-diverse imaging,and submillimeter-wave radar systems. We first present a frequency-diverse computational imaging system developedby Duke University for security-screening applications at K-band (17.5-26.5 GHz) frequencies. Following, we show amillimeter-wave spotlight imaging concept and its conceptual integration with the K-band system as interesting exampleof sensor fusion. We also demonstrate the application of computational frequency-diverse imaging for polarimetricimaging and phase retrieval problems. We show that using the concept of computational frequency-diverse imaging andquasi-random measurement bases, high-fidelity images of objects can be retrieved without the need for any mechanicalscanning apparatus and phase shifting circuits. Increasing the frequency-band of operation, we also demonstrate a 340GHz radar developed by the Jet Propulsion Laboratory and its application for standoff detection. We demonstrate a newtechnique to characterize the point-spread-function (PSF) of radars operating at submillimeter-wave frequencies.
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