Radar schematic needed

microwave radar schematic

Hi all, does somebody have schematic of a radar of any kind ?
It would be very nice if one also could couple the received/processed signal to an oscilloscope.

Regards,
/StoppTidigare

furuno radar schematic

Hi StoppTidigare,

I don't know for what application do you want to use this radar. I guess that it will be to detect the movement of objects like persons or cars (= doppler radar).
To give you only a schematic of such a microwave circuit won't get you happy: There depend a lot of things on substrate material, trace lengths and widths and so on. I fyou are not familar in designing such components, i would use a complete OEM module.
I see two possibilities. You can use a K-Band 'Gunn source' which has an oscillator and a mixing diode in one housing. The output of the mixing diode is a frequency which is proportional to the velocity of an object. You will find suppliers of such modules on internet (search for 'gunn source')
The other thing is to use a planar doppler radar sensor which operate mostly in X-Band. They can be found inside of toys or movement detectors for door-openers. Also these modules give an output signal proportional to velocity. For experiments this is the best choice.

Bye

Hi Mr.GHz I work as a teacher , and I want my students to
build something during one week.

They don't have to fully understand the complete derivation of what they are doing. I want to make them more interested in microwave and RF if by letting them learn by doing.
The level of the students are pre-university.

I would like to have one or more different schematics of various types of radars.
What would be the niciest would be if I can accsees to a schematic that is
both a tranceiver and a FMCW-radar( in some amateur radioband that exists in between 2m-0.5m), and that the output from the receiver
in radar-mode could be coupled to an oscilloscope, so that one could get
the distance information.
Kindest regards,
StoppTidigare

P.S. Maybe you have the time to do some rapid prototyping in
Spectrasys and genesys, and you could sell this to me ?

Hi StoppTidigare

Interesting, interesting... I'm also teaching at a university. For building such a circuit in short time I would prefer a CW radar, not FMCW, because it's much easier (offsets in demodulation). The easiest way is a PCB with the oscillator (1 GaAS FET, some R's and C's in SMD 0603 technology) a Patch antenna and one demodulator-diode (also SMD). The output is a signal corresponding to velocity of an object in the range of the antenna. With an additional ZF amplifier (operational amp) you can see the output signal from persons also some meters away.
If you are interested I can send you schematics and/or layout. For prototyping you can PM.

Bye

Hi StoppTidigare,

serach the ebook upload/download. There are several topics related to radar.

rgds, Al

Look at Furuno website - they have service manuals available for their equipment, including marine radars. The one I downloaded for my friend (not a radar though) contained schematics too.