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Hi All,
If my probe shows the following specs :
1) 10 :1
2) 1 Mohm for 6-24pF
3) 10 Mohm for 13pF
Even though my input technically is 50ohms from the source, does this mean i have to set my oscilloscope to 10x and input load to 1Mhom ?
By the way, what does (2) and (3) means?
Thanks
Use the hfss and plot the the current density and you will see your current movement, and from there you will know where's your e plane and then the 90 degrees of it will be your h-plane (use left hand thumb rule)
You must realize that the e-field and h-field radiation pattern are not assumed.
Different antenna have different plane depending on their current distribution. Before you plot out
your e-plane and h-plane, use HFSS and plot out the current distribution and you will see you electric current...
Yes anechoic chamber is unavoidable. If you have to do the measurement elsewhere, it pretty much useless and inaccurate your data would b.
Directive antenna such as a horn would be good. Remember and understand why you measuring the radiation patterns, whether co-polar or cross-polar.
To measure the radiation pattern, it's better to ensure that both of your antennas are co-polarized with each other in the chamber. To be honest, cross polarization doesnt seem to be that critical.
Co-polarization means that your antennas E-field and H-field are on the same plane.
I guess a lot of people miss out that if your antenna has one port, you can only measure S11. For any other parameters such as s12 or s21, you must have 2 port antenna.
If you want to measure s12 on a single port antenna, you can only do this way....
Simulation Wise :
For example in HFSS...
This is seriously a good post. Just too add, you CAN ONLY AND MUST DEFINITELY INFINITELY measure radiation pattern in an anechoid chamber. The anechoid chamber is full of pyramidal sponges that is creepy looking, the purpose of that room is to prevent reflection of signals on disturbing your...
Re: HFSS - is there a way to display more helpful information on "markers" on graphs?
I don't think you need to scratch your head so much for this simple issue. Once you done all the marking, take a screenshot using this software called 'lightshot' (free to download - Search in Google). After...
To be honest, there's no way to say conclusively about antenna just by looking at it and making assumptions. This is the beauty of RF and electromagnetic, because it's highly unpredictable.
After doing thousands of simulations, i realise that the best way to find out is to do the design and...
It thus make perfect sense.
Perfect E = perfect conductivity where there lines or metal strip is considered lossless.
If the conductivity is finite, means thats the transmission lines or metal strip has a certain degree of loss.
At first i had a problem understanding dbi and db. After much reading and trials, i finally understood what it meant.
Actually, when you do a simulation in HFSS, you won't see a dbi term. But rather you see a dB term. What it exactly meant is that HFSS actually compared the gain to an isotropic...
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