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You can use a wire instead of a SMA conector if you understand the performance and properties of your circuits. Usually, the SMA is for high frequency usage and for a repeatable constant-impedance transition. If using a wire instead of a SMA connector does not influence your circuit operation...
A simple test is using your circular one and a linear antenna. Point both one to another and rotate one of them. Connect TX to the one you rotate and the other to a RX. If you observe a constant power level, then you have a linear one and a circular one. If not, the circular is not circular, but...
Your BFP420 VCO idea might (or let me say will) give you a very noisy signal in the low sub-1MHz range due to its high phase noise. From your first post I was thinking that mixing two YIG oscillators might be the only "good" solution. But you never explained the final application and the noise...
How come you made the vias correct on the microstrip resonators, that is, they are so close that are touching each other, while on the ground the vias are too widely spread. You should use the same approach for the ground pads, where you solder the shield of the coax cable. Like I said, 10+ vias...
If your local representative does not answer, contact directly the global Ansys office and tell them about your university licence purchase and that your local guys don't do their job.
I would recommend to increase the minimal gap to roughly 0.2mm (~8 mils). That's a confident gap you can manufacture or etch yourself. Should be okay for x-band filter too. You mention about some pads that you solder the sucoform cables to. Those pads, if done incorrectly, are a sufficient...
SunnySkyGuy, your story is impressive, but how does it help koen851? Koen851, it looks like you don't have the basic understanding of simple electronics (elements like resistors, capacitors, inductors, diodes and transistors and their combinations), therefore you have problems building your own...
High axial ratio means linear polarization, low axial ratio means circular, but you can not tell which one is it (horizontal or vertical, RHCP or LHCP). HFSS can plot all these automatically, most probably also CST, just find it out.
You're right, you have a conditionally stable/unstable LNA. To have a greater confidence in stability when testing on the SA, don't just connect a 50Ohm termination to the input but also short and open. Additionally I test LNA stability on the SA also with a resonant filter (highly reactive...
I would add output-to-input diodes to both regulators, as described in most of the regulator datasheets. One idea that comes to mind is that your long wires and capacitance make some sort of a resonance LC effect, which you could damp by a low and series resistance at the wire start and end.
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