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Looking your return loss, the question arises about feeding. What feeding you doing, u can start with inset feed or quaterwavelength feed. And, try matching the feed impedance with the edge impedance of patch.
Hi there,
I would recommend you to put required boundary conditions. As, parallel plate mode and slot mode are easily excited otherwise.
I go for wave guide port size as explained by CST , you can see in CST help section by pressing F1.
However, keeping electric wall in sidewall helps to...
What you mean by S22 instead of S11? Make sure your port number first, and when you do simulation (could be transient or frequency) check your port source , whether its 1 or 2!
I would recommend for tetrahedral mesh in frequency domain analysis, with adaptive mesh refinement clicked on. The default value works fine , however making changes from there, should not have much deviation from what is expected.
When you do time or frequency solver, I recommend you to click on the adaptive mesh. Mesh analysis is critical for your design, so doing adaptive is good choice.
Try frequency solver using adaptive mesh once, and let us know if it solves or not!
SIW ports can be simply defined as:
Length of port = distance between the two vias column (from centre, the same distance you calculate when you desing SIW)
Width of port = covering dielectric just touching both the upper and bottom metal surfaces (relate it more to dielectric filled waveguide).
Its better we talk about S parameter in dB scale. You have to clear about S parameters. Lets say S11= b1/a1, where b1 is the reflected and a1 is the incident power. So, if your S11 is high means everything is reflected , so generally it's not possible to have good S21 with bad S11. Particularly...
Simulation and real world results are always in interest. You can see in many research that they compare the simulated result with fabricated ones.
As simulation result are based on theoretical, which as far tries to govern all the physical variables with define equations(relations). More...
One of the attributes if LNA is the frequency of operation. Return loss is key for LNA design. Without having proper input impedance matching with desired S11 (at least below -10 dB) in band of interest there is no point in designing LNA. Also,so goes for output matching which refers S22. But...
Most things as explained by other members. I just want to comment regarding black light, I am not sure what you mean here by black light. Are you referring black as one of color as light?
But, indeed we have black light as ultraviolet light (UV-A ). The name could be misleading sometime.
I didnt exactly get your question. Probably, you doing a waveguide test for short-range-radar. As per port dimension rectangular waveguide, you can pick the inner edge and a point and simply define waveguide port using pick. Also, you can go through the help index of CST, just pressing F1.
I...
I have doubt with a simple CST rectangular waveguide simulation regarding S parameters. I am not able to figure out the return loss esp. higher cutoff frequency of waveguide. Because, with simple back to back test, it looks always less than -60 dB above the defined frequency range.
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