Continue to Site

Welcome to EDAboard.com

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.

Register Log in

Measurement of the phase of the receiving waves with VNA 8753ES

Status
Not open for further replies.
R

rizwan183

Member level 4
Joined
Feb 15, 2013
Messages
70
Helped
6
Reputation
12
Reaction score
6
Trophy points
1,288
Location
Pakistan
Activity points
1,817
Hi!
I want to measure the phase and amplitude of receiving waves with a horn or dipole antenna using VNA. Can someone suggest how can i do it? I am new to measurement. Thanks
 

You need to use two antennas, preferably in an anechoic chamber.
 

I have measured S21 and their was option to measure real and imaginary values from which i calculated phase which seems not quite right as phase response varied alot on single point with minor frequency difference i don't understand. Experimental setup and a sample measurement data is attached in pics.
 

Attachments

  • 01.jpg
    01.jpg
    320.5 KB · Views: 127
  • Capture.JPG
    Capture.JPG
    190.3 KB · Views: 130

You have to specify port extension to compensate for the total cable + air propagation delay, thought you know.
 

IF we need relative phase at different sample points still we need to compensate for these parameters.Also why the phase response obtained as shown in picture varied alot. It is supposed to be single angle.
 

The coupling between the antennas(-80,-90,-100 dB...) looks too low to make a good phase measurement. Phase measurement is sensitive to power levels. You should provide high enough power to make a clear phase measurement.
It seems that you make a mistake in your measurement.
Check your antennas, their frequency band, polarization etc. Start with better coupled networks, you can make the same measurement using a coaxial cable over a frequency band.
Place an attenuator and see how phase measurement is affected if you want. Increase the test power and reevaluate the phase measurement.
 
Status
Not open for further replies.

Similar threads

Part and Inventory Search

Welcome to EDABoard.com

Sponsor

Back
Top