Contents I. Introduction
Millimeter-wave near-field imaging radars are sophisticated sensor systems designed to capture high-resolution images at close range [1], [2]. These radar devices use electromagnetic waves to detect objects and generate detailed images based on the reflected signals, operating effectively even in adverse weather conditions or low visibility environments. In recent years, there have been significant advances in the design and functionality of short-range imaging radars. Many systems now incorporate multiple-input multiple-output (MIMO) arrays [3]–[12], which allow the use of digital beamforming techniques with much fewer elements than traditional arrays. This is achieved by transmitting independent waveforms from multiple spatially separated antennas [5]. These systems are commonly known in the literature as MIMO radars. Imaging MIMO radars are used in a variety of applications, including security, industry, autonomous vehicles and vital signs monitoring. The specifications of some state-of-the-art millimeter-wave imaging MIMO radars with different applications are summarized in Table I.
