API Technologies Corp., a leading provider of high performance RF, microwave, millimeter wave solutions, announced that its Quad Transmit Receive Modules (QTRMs), part of the company’s Active Antenna Array Unit (AAAU) solution for AESA radar, is now available as a stand-alone module. API’s QTRMs offer the industry’s first stackable building block solution for E-Scan (electronically scanned) radar.