×
INTELLIGENT WORK FORUMS
FOR ENGINEERING PROFESSIONALS

Contact US

Log In

Come Join Us!

Are you an
Engineering professional?
Join Eng-Tips Forums!
  • Talk With Other Members
  • Be Notified Of Responses
    To Your Posts
  • Keyword Search
  • One-Click Access To Your
    Favorite Forums
  • Automated Signatures
    On Your Posts
  • Best Of All, It's Free!

*Eng-Tips's functionality depends on members receiving e-mail. By joining you are opting in to receive e-mail.

Posting Guidelines

Promoting, selling, recruiting, coursework and thesis posting is forbidden.

Students Click Here

Microwave doppler radar testing circuit

Microwave doppler radar testing circuit

Microwave doppler radar testing circuit

(OP)
We are developing a microwave doppler radar test circuit to achieve motion detection through walls. To begin with, for this application we need a Oscillator/frequency sythesizer ranging around 1-4GHz. Could suggest me a suitable oscillator device for testing purpose?
If possible, could you also suggest a compatible Multiplier/Mixer to give the IF output and an Antenna.

RE: Microwave doppler radar testing circuit

Is this a school project?

I believe this was discussed earlier (a couple of years ago) you should do a search in here.

RE: Microwave doppler radar testing circuit

Search for: RCWL-0516

Modules available on eBay for $1 price class. Reportedly operates at about 3.2 GHz. I'm not sure if the design includes the baseband output (audio of the Doppler tone).

RE: Microwave doppler radar testing circuit

(OP)
@itsmoked: Its not a school project. I have an idea, but lack the knowledge. Please give relevant answers if you have any. Thank you.

@VE1BLL: Already tried the readily available modules. So we plan to design a circuit from scratch.

RE: Microwave doppler radar testing circuit

Modules from eBay are quite often based on the applicable datasheet's example circuit. SO, at the very least, they provide a useful starting point (after cleaning up the design shortcuts often included) for any chipset or design concept.

Many of the other modules operate on 10.525 or 24.xxx GHz. That PN I mentioned was the only one I've seen that was in the lower frequency range that you mentioned. You'll have to consider the legal ISM bands in your Region and jurisdiction for this "Field Disturbance" application.

For Doppler, typically the LO is the transmitted RF. These days, the oscillator would presumably work directly at the operating frequency (without requiring a Multiplier).

Good luck.

Red Flag This Post

Please let us know here why this post is inappropriate. Reasons such as off-topic, duplicates, flames, illegal, vulgar, or students posting their homework.

Red Flag Submitted

Thank you for helping keep Eng-Tips Forums free from inappropriate posts.
The Eng-Tips staff will check this out and take appropriate action.

Reply To This Thread

Posting in the Eng-Tips forums is a member-only feature.

Click Here to join Eng-Tips and talk with other members! Already a Member? Login


Resources

Low-Volume Rapid Injection Molding With 3D Printed Molds
Learn methods and guidelines for using stereolithography (SLA) 3D printed molds in the injection molding process to lower costs and lead time. Discover how this hybrid manufacturing process enables on-demand mold fabrication to quickly produce small batches of thermoplastic parts. Download Now
Design for Additive Manufacturing (DfAM)
Examine how the principles of DfAM upend many of the long-standing rules around manufacturability - allowing engineers and designers to place a part’s function at the center of their design considerations. Download Now
Taking Control of Engineering Documents
This ebook covers tips for creating and managing workflows, security best practices and protection of intellectual property, Cloud vs. on-premise software solutions, CAD file management, compliance, and more. Download Now

Close Box

Join Eng-Tips® Today!

Join your peers on the Internet's largest technical engineering professional community.
It's easy to join and it's free.

Here's Why Members Love Eng-Tips Forums:

Register now while it's still free!

Already a member? Close this window and log in.

Join Us             Close