sponsored by IRE Professional Groups on Electron Devices Microwave Theory and Techniques. sponsored by IRE Professional Group on Electron Devices, Microwave Theory and Techniques. IRE Professional Groups on Electron Devices Microwave Theory and Techniques. IRE Professional Groups on Electron Devices, Microwave Theory and Techniques. sponsored by IRE Professional Groups on Electronic Computers Information Theory. sponsored by IRE Professional Groups on Bio-Medical Electronics. sponsored by IRE Professional Groups on Instrumentation, Nuclear Science, Telemetry and Remote Control. organised by Professional Group E12(Microwave devices and techniques) sponsored by IRE Professional Groups on Antennas and propagation. sponsored by IRE Professional Group on Antennas and Propagation.