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UWB antenna question

 
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raphael
Antenna Theory Regular


Joined: 22 Dec 2011
Posts: 13
Location: France

PostPosted: Fri Mar 22, 2013 4:20 pm    Post subject: UWB antenna question Reply with quote

Good morning everybody.
I have a question related to UWB antenna requirements:

In addition to the impedance and to the radiation pattern, it is said that we should consider the phase response. The antenna must have a linear phase response across the ultra wide bandwidth. This in order to prevent from distorsion.
But i don't know what this phase means. I understand for a filter but not for an antenna (since there is no input/output). Is it the phase of the S11 parameter? I only see this one.

Many thanks in advance
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bigSteve
Antenna Wizard


Joined: 14 Mar 2009
Posts: 265

PostPosted: Fri Mar 22, 2013 5:38 pm    Post subject: Reply with quote

Who says the antenna should have a "linear phase response"?
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raphael
Antenna Theory Regular


Joined: 22 Dec 2011
Posts: 13
Location: France

PostPosted: Fri Mar 22, 2013 11:34 pm    Post subject: Reply with quote

I read it in few communications and papers that deal with this subject
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raphael
Antenna Theory Regular


Joined: 22 Dec 2011
Posts: 13
Location: France

PostPosted: Mon Mar 25, 2013 9:55 am    Post subject: Reply with quote

i have finally found the setup measurement of such parameter and hence what it is exactly. We have to compute/measure the S21 parameter between a pair of such antennas (and removing some delay contributors such as propagation medium, balun, etc.).

Hope it can help someone else.
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