The frequency of continuous wave radar Level Transmitter is generally 80GMHz, 120GMHz, millimeter wave radar wave. Frequency modulation continuous wave radar, the signal is sent from the antenna, and the echo is received by the antenna after being reflected by the measured medium. The transmitted signal frequency is proportional to the difference in frequency received by the echo. After FFT, the frequency difference is converted into a spectral difference, and then converted into a measurement distance. The total range minus the measurement distance is the actual liquid level. For FM CW radar, the accuracy can reach ±1mm. For FM continuous wave radar, the maximum range can reach more than 1000M. For frequency-modulated continuous wave radar, its beam angle is small, its energy is concentrated, and its permeability is strong. It is suitable for harsh conditions such as violent liquid level fluctuations and stirring. Advantages of FM Radar Level Transmitter: Due to the characteristics of the FM continuous radar itself, compared with the pulse radar, it has the advantages of small blind spots and low interference probability. In addition, the radar of the system can perform speed measurement, distance measurement, angle measurement and other operations at the same time, and can obtain rich target positioning information. It is worth noting that the frequency of the difference frequency output signal of the radar is low, which reduces the difficulty of hardware design for signal processing. Frequency modulated continuous wave radar can be widely used in scenarios such as vehicle collision avoidance, liquid level measurement, assisted parking, and vital sign detection. The successful development of radar is for the national economy. It plays a great role in promoting the development of national defense. At present, the 1200 millimeter-wave radar Ghz frequency band is mainly used, which greatly reduces the antenna size and continuously improves the product integration. Using 120GHz combined with a lens antenna, the beam angle of the radar can be narrowed to 4°. The internal measurement is close to the lidar, and the anti-interference performance is much better than that of the lidar. Disadvantages of FM Radar Level Transmitter: The manufacturing cost of radar Level Transmitter is relatively high. The pulse/FM radar antenna is made of stainless steel and PTFE, and the maximum operating temperature of PTFE is 200° and the maximum pressure is 4MP. When the guided wave radar is composed of stainless steel and ceramics, the maximum operating temperature is 400° and the maximum pressure is 40MP. The low-frequency radar level transmitter is still the first choice for the low-frequency radar level transmitter and cannot be completely replaced.