Tips for RF test fixture design

[JrV]

Hi,

Does somebody have experience in RF test fixture design, in microstrip, and can give some tips and tricks (mechanical and electromechanical).

Thanks.

Regards,
JrV

 

[ge]

tests fixtures design basics

>> ... some tips and tricks (mechanical and electromechanical).

We would need to know some specifics of what you are testing. i.e. frequency, bandwidth, power.

 

[JrV]

test fixture design

Hello,

The idea is a design around 2GHz for model verification up to 5 harmonics. Power levels form 1 W up to 100W or higher (heating issues)

At the moment, I am playing with the TRL approach. Using a split block approach (similar as the Focus test fixtures).

The problem is that the impedance of the devices under test can have a low impedance, no pre-match. Here a solution can be Klopfenstein taper.

Tips are welcome

JrV

 

[jayce3390]

fixturedesign

At 2GHz you could take RF35 substrate to do your test fixture.
I did one in S band.

I guess you want to measure packaged transistor.
5 harmonics it's possible, but more should be hard.

I did a TRL test fixture on 50 ohms Zr. But you can do with lower, usually 7 ohm, depends on the package used.