Millimeter wave short range radar system design

In this paper, a 24 GHz millimeter wave (mm-wave) short range radar system is presented. In the designed radar system, there is one transmitter and one receiver channel. The transmitter channel has +9 dBm output power and 24 GHz output carrier signal is modulated with 20 ns square wave by SPDT switch. At the receiver channel, there are two LNAs, which have totally 40 dB gain, a microstrip band pass filter (BPF) and a double balanced IQ mixer. The designed radar system is measured using an oscilloscope at output of IF channel. According to the results, it is seemed that 200 mV and 50 mV reflection levels are received from metal and human target, respectively, at 2 meters without IF amplifier. ADE reflector antennas and horn antennas are utilized for transmitting and receiving.