sponsored by IRE Professional Group on Circuit Theory. sponsored by IRE Professional Groups on Bio-Medical Electronics. sponsored by IRE Professional Groups on Antennas and propagation. sponsored by IRE Professional Group on Antennas and Propagation. sponsored by IRE professional groups. sponsored by IRE Professional Groups on Electronic Computers Information Theory. sponsored by IRE Professional Groups. sponsored by IEEE Professional Communication Society. sponsored by IRE Professional Group. sponsored by IRE Professional Groups on Communications Systems Vehicular Communications.