A millimeter-wave (mmWave) assembly (1) comprising a first mmWave module (2), a second mmWave module (3), and a connector (4) configured to releasably interconnect the first mmWave module (2) and the second mmWave module (3). The connector (4) comprises a first connector element (5) associated with the first mmWave module (2). The first mmWave module (2) comprises a first substrate (7) and an mmWave radio frequency integrated circuit (RFIC) (8), and the second mmWave module (3) comprises a second substrate (9) and an mmWave antenna array (10). The connector (4) is configured to transmit at least one signal between the mmWave RFIC (8) and the mmWave antenna array (10) when the first mmWave module (2) and the second mmWave module (3) are interconnected.