| 摘要 |
The present invent relates to a Doppler radar. The Doppler radar includes: a differential oscillator for outputting first and second oscillating signals having an identical oscillation frequency (f_0); a transmission antenna for receiving, from the differential oscillator, the first oscillating signal and transmitting the first oscillating signal; a reception antenna for receiving, from the outside, a reflection signal and providing the reflection signal; a mixer for receiving the second oscillation signal from the differential oscillator as a local oscillation signal, receiving the reflection signal from the reception antenna, and mixing the local oscillation signal with the reflection signal to convert into an intermediate frequency signal and output the intermediate frequency signal; and a low pass filter for filtering the intermediate frequency signal from the mixer to provide the filtered signal. According the Doppler radar, the first and second oscillation signals have the identical oscillation frequency (f_0) and have a phase difference of 180° therebetween. According to the present invention, a chip area can be minimized, thereby reducing manufacturing costs. |
