Welcome to our site! EDAboard.com is an international Electronics Discussion Forum focused on EDA software, circuits, schematics, books, theory, papers, asic, pld, 8051, DSP, Network, RF, Analog Design, PCB, Service Manuals... and a whole lot more! To participate you need to register. Registration is free. Click here to register now.
Hi guys,
we are setting up an antenna measurement system with VNA (E-band, rotary unit, 20 dBi standard gain horn).
Could somebody please mention reasons to rotate (azimuth and elevation) the AntennaUnderTest (AUT) and not the standard gain horn (reference antenna).
As it is a reciprocal...
Hi,
could somebody tell me what exactly the outcome of an RCS-simulation, as shown in the attached pic, is.
I guess it is the RCS value, seen by a radar looking at a certain angle to the object.
In the attached example, RCS values are high for Theta~30deg and low for boresight or Theta>50deg...
So, for the sake of completeness. I was wondering why there is no phase information for realized gain. Actually we now use realized gain plus Etheta (mag/phase) and Ephi (mag/phase) for further analysis.
Hello,
if we measure antennas in the antenna chamber with vector-network-analyzer (VNA).
Let's say two identical antennas:
The measured S21 transmission parameter (divided by 2 and corrected for freespace loss) is available for each angle (azimuth, elevation).
How do I reproduce those results...
E(x,y,z,t) = Epeak(x,y,z) * cos[wt + phi(x,y,z)]
I guess HFSS is using Epeak(x,y,z) in case of magE. Using animation the cos-term is multiplied.
Does anybody know the difference to cmplxE. In the latter case, animation is not possible, result does not depend on time.
Hello, as straight waveguides should have linear dependency between transmission S21 phase and frequency, and group delay is the derivative of transmission phase with respect to frequency, why is group delay over frequency of a straight waveguide not constant. Thank you for your help, -e
... to be a little bit more precise:
Using S11(f) expressions of a transmission line with characteristic impedance ZW and termination impedances ZT, we can see 20*log10( abs(S11(f))) having maxima and minima.
For a simple transmission line, the input reflection coefficient r_input is the...
This site uses cookies to help personalise content, tailor your experience and to keep you logged in if you register.
By continuing to use this site, you are consenting to our use of cookies.
