Multiple-element MMIC modules for a highpower, high-efficiency 44 GHz transmit phased array are demonstrated. Two-element modules, employing TRW HEMT-based MMICs, have demonstrated 28 dBm output power per element and 21 -23% module power-added efficiency. We believe these to be the highest output power and poweradded efficiency achieved by MMIC-based EHF phased array modules to-date.