Techniques for imaging of millimeter waves with a phased array

An apparatus for detecting a high-frequency image, the apparatus comprising: an array (104) of radio-frequency antennas (106) carried by one or more packaged integrated circuits (108); and a control unit (110) which is adapted to selectively phase shifts the high-frequency signals from the antennas, so that at least a portion of the high frequency of the image is focused, a lens assembly (404) containing at least one fixed lens (406); wherein the array (104) of antennas is arranged in a focal plane of the lens assembly, and a power coupler (502) which is arranged so that it combines the high frequency signals from the antennas; A plurality of high frequency switches (504) each high-frequency switch (504) is connected to a respective radio-frequency antenna (106), so that the signal from each antenna separately shown or is combined by the power combiner with other high-frequency signals from the antennas; and a phase shifter (506) for each antenna.