  Far-field imaging beyond the diffraction limit is a long sought-after goal in
various imaging applications, which requires usually an array of antennas or
mechanical scanning. Here, we present an alternative and novel concept for this
challenging problem: a single radar system consisting of a spatial-temporal
resonant aperture antenna (referred to as the slavery antenna) and a broadband
horn antenna (termed the master antenna). We theoretically demonstrate that
such resonant aperture antenna is responsible for converting parts of the
evanescent waves into propagating waves, and delivering them to the far-field.
We also demonstrate that there are three basic requirements on the proposed
subwavelength imaging strategy: the strong spatial-temporal dispersive
aperture, the near-field coupling, and the temporal (or broadband)
illumination. Such imaging concept of a single radar provides unique ability to
produce real-time data when an object is illuminated by broadband
electromagnetic waves, which lifts up the harsh requirements such as near-field
scanning, mechanical scanning or antenna arrays remarkably. We expect that this
imaging methodology will make breakthroughs in super-resolution imaging in the
microwave, terahertz, optical, and ultrasound regimes.
