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I have one transmitter antenna at port 1 of a VNA, and one receiver antenna at port 2 of the VNA. I will make measurement of reflection coefficient of S11. Should I turn off the power at port 2 since (otherwise) it will send a power to the receiver antenna and this can make the receiver antenna...
I get it my finger changes the matching, however what confused me is, I read somewhere that about hand sensitivity, if I touch to it and if it oscillates, might it be saying me that dc lines carries rf signal? and mismatching with my finger is that doing it?
an antenna at the input, followed with filter and lna then soldered to the coaxial cable (without any connector at the board).
When I touch at the output of the LNA region where the decoupling and output matching circuit components are, and also very close to the coaxial cable soldering...
I wanna ask one more Question. I did measure the current. After some voltage level, the current remained same even tho I increased the voltage( between the supply volt. limits of LNA). Does that mean it is okay
Using a resistor between them and make measurement on that with a multimeter couldn't be efficient since it's high freq and the resistor might not be suitable?
Assuming that I have a GHz antenna with integrated LNA. I can use power supply to feed the LNA integrated to the antenna. How I can measure how much current the whole system draw?
But the problem I ask is not about 50 ohm measurement. how 1-port LNA’s gain measured If the antenna input is soldered to the signal path without any connector. I think, in such a case, I should desolder the antenna, and solder a coax cable which has connector at its other end, then I will have...
Wanna know LNA parameters. Aint there another way to measure LNA S-parameters? For exp; some guys advises that “terminate LNA input and measure the output” How is then possible? we have 1 port left again for VNA? Because assuming the antenna is not connectorized to the input of the board. lets...
I know when I have two port LNA, I can use VNA to get its gain i.e S21.
However, how can I measure its S21 when I terminated its input? For example, if we have a board that includes a patch antenna at the input and its ground plane soldered to the PCB ground and fed with via to PCB top. So there...
I wanna measure LNA to see if there is oscillation or not with spectrum analyzer. How should I set up the measurement? Is the noise figure what I m looking for or the stability?
I design antenna with two coax, and want them work simultaneously. However, when I choose source type->selection instead of all ports; it prevents me to normalize the impedance for S parameters.
Why?
Thanks, when you say "Not fully balanced" you mean it because of the feed points on the antenna, right? Since we know the coax is unbalanced, I wonder whether a balun is needed or not. So if it's not fully balanced, a balun is not a need since the feeder (coax) is already unbalanced? It says the...
I wonder can we call this clover inspired crossed dipolea antenna balanced or unbalanced.
Since the coax's inner conductor feeds the one of top clovers, and the outer conductor (which's also grounded) feeds the diagonal clover of it at bottom of the substrate. (the other clovers at the other...
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