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D.A.(Tony)Stewart
Yes that picture pretty correct, and model by volker@muehlhaus also correct.
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...
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.
I don't have "time gating" option on vna...
I have access to only 2 port VNA, so I put all measurements on one graph, but during measurements I switched ports. I've checked my coax loads, cables and they are Ok.
On graphs the only "wrong" parameter is isolation its around 62dB, hence (D) directivity is also poor. Should be 74 dB.
I did...
Regarding old design without prepreg. There was second aluminum plate on the top, so i tighten (with screws) metal to metal and pcb inside, also rf connectors were tighten to both metal plates so ground were more or less uniform. I thought that "normal" board with pregreg and "nornal" enclosure...
D.A.(Tony)Stewart
Width for microstrip part 3.32 mm, for stripline 1.636 mm, thickness 60 mil +4 mil prepreg +60 mil Er 3.6. "Window" cut out in top laminate 5 mm width and 3.5 mm length. Main problem is isolation between main line and reflected, port 1 to port 4. It is around 62 dB, but should...
Hi, I have a question about connection to the stripline structure, how it usually done? My board is directional coupler in VHF range, that is made from two laminates + prepreg. I need to connect coaxial connector to the central layer, so in the design I made cutout in the second (top) laminate...
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