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My issue is related with the setting of measurement time (MT) on a EMI receiver with the aim to capture occasional frequencies of EMI that appear, perhaps, only once and in random manner, not periodically, during a device's switch on event.
Studies say that dwell (or measurement time, i.e. MT)...
Thanks for the answer. Actually, you are right: I forgot to consider the fact that AF has to be determined at a specific distance as well, 10m in my case.
The reason I want to do E-field estimation 10m away from the antenna and along its main axis, is to verify the site attenuation. I use a...
Dear All,
I am trying to calculate the E-field (in dBuV/m) generated by an antenna, given the input signal on the antenna's terminals and the antenna AF supplied by the manufacturer, all at a specific frequency.
Example: Signal generator feeds the antenna with Vt=100dBuV at 40MHz (ignore cable...
After many hours of measurements, I finally discovered that the adapters I've used to connect the VNA with the cable (SMA-UHF) were the cause of some serious impedance mismatch that was generating all these terrible ripples on the VSWR response. The extend of the problem was so scary that I've...
I really can't figure out what's going on with this wide SWR flactuation across the spectrum.
I have repeated the measurement again this time, but with a 1.5m long RG174 cable. One end of this cable is attached on the VNA port (MiniVNA Tiny), the other end is terminated on a 50 Ohm Diamond load...
Ok, I got your point now. The dips appear every about 25MHz or so, which is near the λeff/2 of the cable as you mentioned, a condition which is known to force the value of the load (i.e. 50 Ohm) to 'appear' at the input.
So, these fluctuations on the response clearly indicate that the system...
Some really basic measurement experiment with my MiniVNA Tiny analyzer.
After careful calibration of the VNA, I wanted to check how the input impedance up to 500MHz of a 4m long RG58 cable, terminated on a 50 Ohm dummy load varies. To my surprise I noticed that the SWR response was not flat at...
Re: 5W out-put FM transmeter
Not for 5W output power but 15W (you could use a slightly lower supply voltage or
attenuator at the output to achieve about 5W):
**broken link removed**
has only schematic, but it's not that difficult to spend sometime on your own to
draw the PCB layout.
Good luck.
You can only use S11 measurement. I think Balanis book has a nice and
simple but still accurate way to calculate antenna efficiency through
measurement.
Assuming that your antenna is small enough (say biggest dimension
not more than 10 cm or so) idea goes like this: In open space Q factor...
cst out of memory
Has anyone tried to investigate CST's performance on Win XP SP2 64 bit enviroinment? I am about to proceed into such an OS to see whether
it will be beneficial in terms of simulation time.
However, I was wondering: I now have 4GB or RAM (under 32bit WinXP).
Would my...
I 've done something similar quite long time ago so I will only guide
you roughly and give you some ideas. Two options from me:
1) create a new folder within CST MWS results and paste there the required
graphs. Make sure though that these are relevant, e.g. I don't think of course that you...
Was wondering how you added the curved metalized plates on the ring. Did you
create any special macro for this purpose, or used any existing ones?
Nice geometry, I like it!
microstrip antena
Hi,
I guess your design isn't going to be specialised (complex shapes or multi layer or etc..etc.), so I would direct you to check Balanis book 'Antenna Theory' Chapter on mictrostrip antennas.
You will find have ever you need (from theory, to simplified design equations) to...
sma adge
I had to design once a SMA feeder together with an antenna using MWS.
I simply downloaded a SMA datasheet from a manufacturer
and got information about its size and the properties of the
insulator (er, losses, etc.).
I interfaced the SMA connector with the
antenna using 'wires' of...
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