The AP61-1 K-band microwave sensor belongs to the AP6 series suitable for CW, FSK or FMCW operation. It consists of a HEMT oscillator, single balanced mixers and bi-static microstrip patch antenna arrays. Integrated with a low noise amplifier (LNA), the AP61-1 transceiver is cost effective for mid-range speed detection and ranging applications. As it does not have integrated IF amplifiers, it is the most flexible for a wide range of applications in security, intrusion detection, traffic monitoring, speed measurement, security, lighting control and sports training.