# [UWB] TX-RX Voltage Transform Function - RF Cafe Forums

The original RF Cafe Forums were shut down in late 2012 due to maintenance issues. Original posts:

kaka
 Post subject: [UWB] TX-RX voltage transform function Posted: Thu Sep 22, 2005 9:59 pm
Dear all :
when we research uwb antennas , it always need to compute the TX-RX voltage transform function.

i will appreciate Dr. Hans Schantz, who is very famous in antenna field , he writes a mail to me that hfss can do the tx-rx function research. but he doesn't explain it in details .
and my question: how HFSS (or others software,if you know) do this work ?and how to set in the software ?
Does we simulate from one antenna's(Tx antenna) and use hfss's some functions to get the tx-rx antenna voltage transform function , OR , does we simulate through both Tx-Rx antennas to get the transform function ?
i will appreciate your help very much.
woshifanka

ps : if you know ,please explain in some details , and a *.hfss as a example will be appreciated .

UWB_antenna_guy
 Post subject: Posted: Fri Sep 23, 2005 3:13 pm
 Colonel

Joined: Tue Aug 09, 2005 1:07 pm
Posts: 28
you are right, Hans Schantz is a good guy... Why don't you ask him your question?

I work in UWB myself, but I don't know what you are asking for. What is the "TX-RX voltage transform function?"

fanka
 Post subject: Posted: Fri Sep 23, 2005 9:53 pm
Dear UWB_antenna_guy:
Thank you for your post firstly.
the tx-rx voltage function means: two antennas, one is for transmit ,and another is for receive . and they are departed in some distance , for example, 3 feet.
and we want to computer the received voltage of the second antenna.
and i want use software to computer this tx-rx function.

fanka

UWB_antenna_guy
 Post subject: Posted: Mon Sep 26, 2005 9:34 am
 Colonel

Joined: Tue Aug 09, 2005 1:07 pm
Posts: 28
fanka wrote:
Dear UWB_antenna_guy:
Thank you for your post firstly.
the tx-rx voltage function means: two antennas, one is for transmit ,and another is for receive . and they are departed in some distance , for example, 3 feet.
and we want to computer the received voltage of the second antenna.
and i want use software to computer this tx-rx function.

fanka

I really don't think that Hans Schantz suggested to model both antennas and the separation in HFSS for instance. Why don't you simply calculate S21 of the receiver antenna, S12 of the TX antenna and calculate the received voltage that way?

fanka
 Post subject: Posted: Mon Sep 26, 2005 11:53 pm
[/quote]

I really don't think that Hans Schantz suggested to model both antennas and the separation in HFSS for instance. Why don't you simply calculate S21 of the receiver antenna, S12 of the TX antenna and calculate the received voltage that way?[/quote]
Dear sir:
Yes , MR. Hans Schantz has suggested me do calculate s21 of the receiver antenna ,which is the same as you said .
Now i have a question , how to get the s21 easily ?
should i make a single antenna model can calculate its s parameter and then use antenna array setting in HFSS and get the S21 ? or other ways .
can you tell me what you do ?
thanks you very much.
Fanka

UWB_antenna_guy
 Post subject: Posted: Tue Sep 27, 2005 10:21 am
 Colonel

Joined: Tue Aug 09, 2005 1:07 pm
Posts: 28
fanka wrote:

I really don't think that Hans Schantz suggested to model both antennas and the separation in HFSS for instance. Why don't you simply calculate S21 of the receiver antenna, S12 of the TX antenna and calculate the received voltage that way?[/quote]
Dear sir:
Yes , MR. Hans Schantz has suggested me do calculate s21 of the receiver antenna ,which is the same as you said .
Now i have a question , how to get the s21 easily ?
should i make a single antenna model can calculate its s parameter and then use antenna array setting in HFSS and get the S21 ? or other ways .
can you tell me what you do ?
thanks you very much.
Fanka[/quote]

I am not sure which simulation package you are most familiar with. S21 is related to the antenna gain and most simulators are able to determine the antenna gain (and yes, best to setup a single antenna model). I am not familiar with the array setting in HFSS but you are not trying to setup an antenna array.

Guest
 Post subject: Posted: Thu Sep 29, 2005 10:14 pm
 UWB_antenna_guy wrote: I am not sure which simulation package you are most familiar with. S21 is related to the antenna gain and most simulators are able to determine the antenna gain (and yes, best to setup a single antenna model). I am not familiar with the array setting in HFSS but you are not trying to setup an antenna array. hi sir : sorry firstly for my delay reply as my net is bad for several days till now , i use HFSS sv . yes, when we built a single antenna model , hfss can calculate its gain (FEM). i read some references before , and remember they calculate the S21 through two antenna (TX adn RX) so i wana ask you how can i calculate the S21 only through one antenna in hfss ? many thanks .woshifanka

Posted  11/12/2012

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