how does this show the interface of your board to the N connector conductors and dielectric?Here is detailed picture of the board. Connector's pin soldered directly on the pad.
Real board has "trapezoidal" shape cut out, don't know is it normal situation or fault of the production I am just not familiar with technology of stripline boards.
View attachment 189141
View attachment 189143
If am correct on the picture "P1E blue material" is ground metal surrounding coax connector, in my coupler ground path goes 1) connector 2) al6061 enclosure 3) board. I don't know how actually implement assembly where top and bottom will be perfectly symmetrical. In my enclosure thickness of the wall near connectors is 3 mm. Additionally my covering plate do not cover area with pins, I was afraid of possible arc. From pictures there are three parts, first, main enclosure, second, insert that pushes board, and third top lid. When tightened together board's both top and bottom touch metal but "path" for top layer longer. I tried to wrap board with foil, but not exactly above connectors, I will try this.Note that in my model, the coax shield has proper connection to top and bottom ground cover, it touches both metals.
I don't know, but I have connectors that i used in the old prototype, and will try new board with them, hence exclude effect of the enclosure and see if there is difference.In #4 you mentioned a version that worked well, but I didn't quite understand which of the three modifications listed there did the trick, and why?
No, I actually do not know how to do it. But I found interesting thing when I remove push in insert (that connects top cover of the board to the enclosure), isolation grows, just from 62 to 64 dB. Also I found that enclosure is not perfectly flat, but when I tighten board touches enclosure everywhere without gaps.Have you ever checked resonance modes of the enclosure ?
The coax dielectric length is 3.18mm, so that there might be a gap between the enclosure side wall and the PCB, and ground current take some extra path length. However, that should also be visible in return loss of the main line.In my enclosure thickness of the wall near connectors is 3 mm.
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