The CHM1291-99F from United Monolithic Semiconductors is a RF Mixer with RF Frequency 25.00-32.00 GHz, LO Frequency 12.00-15.50 GHz, IF Frequency 0.10-3.00 GHz, Conversion Loss 11 dB, LO Drive - Power 5 dBm. Tags: Die. More details for CHM1291-99F can be seen below.