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It's really a non issue… the SMA connector is 50 ohm, the antenna would be 99% 50 ohm and the coax in between will be 50 ohm. So place your reference plane at the SMA connector and match up to that; the rest is 'assumed' to be already matched. If for some strange unusual and incomprehensible reason your antenna will not be 50 ohm then you'll have to match ...


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The calibration open for a VNA usually has several vital things A shield over the open so there is no radiation loss. This may take the form of a solid cap, or could simply be an extended outer for at least three cable diameters. In the latter case, an evanescent wave travels into the outer, and is sufficiently attenuated before it gets to the open end that ...


4

This is a picture of the parts in the calibration kit for my NanoVNA: To the left is the 50 ohm terminator. The pin in the center is connected to the outer conductor through a 50 ohm resistor hidden in the cap. In the center is the short circuit terminator. You can clearly see that the center pin is connected directly to the shell. On the right is the ...


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Your interest seems to be in generating oscillating magnetic fields, which suggests that you wish to maximize current at resonance. A series LC circuit would be more appropriate, where resistance to current flow is minimum at resonance. Coil losses due to radiation, and losses due to its wire skin resistance are lumped together and shown as inductor losses: ...


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Why do I not have to connect it to ground? You do need to connect both ends of the parallel tuned circuit to the VNA to analyse it. With no return connection (as shown in your diagram) you may still detect some form of resonance due to parasitic ground connections but, the measured Q of the circuit will not be representative of reality. If I do so, the ...


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