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Usually how to find out the aperture of an antenna? By measurement or simulation?
Is there somewhere the aperture for frequently used antenna can be found?
I can see the aperture values of some antennas are listed in Wiki, e.g. the aperture for half-wave dipole is 0.1305*lamda^2
but I would like...
Could you still see the packets on "right" channel? Or the packets can only be seen on wrong channel.
Near field effect should not affect the channel (or say the central frequency) of the received packets.
It sounds to me like a non-linearity effect.
I am trying to build a normal mode helix antenna (UHF band) with a long thin copper wire
Now the total length of the wire I used to build the antenna is about half-wavelength
The measured S11 of the antenna looked ok but not very good
The main reason is the real part of the input impedance of...
Thanks for your reply.
I did not add anything when I checked the calibration. I just put the O and S kit back and found what mentioned above. If the VNA itself has not been calibrated for a long time, will this happen?
The VNA I was trying to calibrate is with N-type output port and I added an N-type to SMA adaptor so the cal kit can be applied. What I am trying to do is a SOL full one-port calibration over the band of 2.3-2.6GHz.
After I completed the cablibration, I put the O and S cal kit back to the port...
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