Tutorial, Experiment & Teardown of a 24GHz Doppler Radar Module

In this episode Shahriar demonstrates a full analysis of a CDM324 24GHz Doppler radar module from IC Station. Opening the module reveals a series of microwave PCB components and several active devices. A complete analysis of the module is presented. The unit is then measured and the impact of antenna impedance and power supply voltage on the output frequency is measured. The phase noise of the output signal is also measured. Using a series of servo motors, the radiation pattern of the antenna array in both azimuth and elevation is also presented.

Using the radar module the speed of a computer fan is remotely measure using an oscilloscope and FFT function.

All proceedings from Patreon for this video will be donated.


  1. Mazen says:

    Great stuff as usual, keep up the awesome work!

  2. JBeale says:

    Great stuff, an interesting topic and very clearly explained. I have used a few of these 24 GHz modules to detect cars moving past my driveway, they pick up pedestrians and bikes too. It’s amazing how cheap they are (the X-Band HB100 at 10.525 GHz is even cheaper), although of course also highly sensitive to any noise on the DC power.

    • JBeale says:

      (to get any useful range, I had to spend a lot more on creating a low-noise DC power supply than I did on the module itself)

  3. Wanita says:

    Thanks so much for your such wonderful projects about the CDM324 24GHz Microwave Sensor Module. (=^_^=)

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