Yes, that's the local oscillator. I have built several small modules instead of a big one and now the interferences are smaller. They still exit, but are smaller...
Both the top and the bottom ground planes should be well connected since there are vias every 2 mm and the connectors are soldered on both planes.
In the test circuit that I mentioned, the gap has a lenght of approximately 6 mm.
Concerning the clearance. I think what have is a coplanar...
Thank you very much for your answers.
BrianG, yes my network analyzer is 50 ohms matched and there is a ground plane on both layers. The filter is not oscillating.
Please, I'd appreciate if somebody answered a couple of questions.
- What distance (clearance) should there be between the RF...
Thank you for your answer.
Yes, I have avoided abrupt turns in the strip lines. I think the problem has more to do with the SMA connectors...
I have built a microstrip circuit just with the two SMA connectors and a line between them. I have cut the line and when I connect the spectrum...
Hello everybody!
I have recently built a module which up-converts a baseband signal between 90 and 190 to an IF signal between 2263,5 and 2363,5 MHz. This module needs an OL signal of 2453,5 MHz @ 0dBm which passes through a buffer amplifier consisting of a band pass filter, an amplifier and an...
