The .625" Cavity Backed Archimedean Spiral Antennas from Meggitt PLC is a Antenna with Frequency 18 to 40 GHz, Gain -2 to 2 dBi, Operating Temperature -55 to 85 Degree C. Tags: Spiral. More details for .625" Cavity Backed Archimedean Spiral Antennas can be seen below.