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

Why there's a phase jump of S11 at the resonant frequency

Status
Not open for further replies.
D

dynaren

Newbie level 5
Newbie level 5
Joined
Apr 17, 2009
Messages
8
Helped
4
Reputation
8
Reaction score
2
Trophy points
1,283
Activity points
1,342
frequency jump phase jump

Hi All,

I have a basic question - what causes the phase jump of S11 from -180 to -180 at the resonant frequency in a resonate structure.
(The resonant structure is equivalent to LC in series. )
In experiment, the jump is less than 180.

Thanks in advance.
 

Re: Why there's a phase jump of S11 at the resonant frequen

Could you try to repair your question?

what causes the phase jump of S11 from -180 to -180 at the resonant frequency
Click to expand...

There is no jump from -180 to -180. (Even if you meant -180 to +180 there is no jump).

In experiment, the jump is less than 180.
Click to expand...

Do you mean you are comparing an experiment with some theoretical result/simulation result?
 

    V

    Points: 2
    Helpful Answer Positive Rating
Re: Why there's a phase jump of S11 at the resonant frequen

Thanks for your answer.
Yes, I am comparing experimental result to CST simulation result.
In simulation result is showing in the picture attached.
 

    V

    Points: 2
    Helpful Answer Positive Rating
Re: Why there's a phase jump of S11 at the resonant frequen

What I am trying right now is to derive this phase from Zin.
And Zin = R+jwL+1/iwC
S11 = (Zin-Z0)/(Zin+Z0)
Hope I'm on the right track.
 

    V

    Points: 2
    Helpful Answer Positive Rating
in fact, there is no phase jump.
if you add 360deg to the part before the resonant frequency, which can not change phase, you will find the phase is continuous.
the phase is turning anticlockwise in polar coordinates.
 

    V

    Points: 2
    Helpful Answer Positive Rating
Status
Not open for further replies.

Similar threads

Part and Inventory Search

Welcome to EDABoard.com

Sponsor

Back
Top