[HFSS Question] how to setup CPW-fed ports?

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blue_electron

Joined: 26 Jan 2007
Posts: 15

13 Feb 2007 10:29 hfss cpw

hi,

im desgining a PIFA printed on FR4 with a CPW-fed port..
how to setup the ground plane at both ends of the middle feed-line?

thanks!

leelanath

Joined: 05 Dec 2006
Posts: 3

15 Feb 2007 18:54 cpw hfss

Hey,

Check out the attachment. It will answer your question.

Ashwin.

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fishyxl

Joined: 01 Dec 2004
Posts: 66
Helped: 2

16 Feb 2007 6:52 hfss cpw port

give me the model and i can set it for you

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16 Feb 2007 6:52 Ads

jjyan

Joined: 08 Mar 2007
Posts: 1

08 Mar 2007 0:58 hfss port for cpw

I have a problem with the CPW feedline too (test)

ananth

Joined: 29 Jun 2004
Posts: 114
Helped: 12
Location: India

12 Mar 2007 11:24 hfss cpw ports

Search in the Electromagnetic Simulation board in this forum for this info. There's plenty of articles about this in that board.

Ananth.

jeboy

Joined: 16 Mar 2007
Posts: 1

04 Apr 2007 9:03 hfss cpgw

I got a question,
should i ues the lumped port of wave port
since the two results are different

tigerlily

Joined: 13 Mar 2007
Posts: 2

05 Apr 2007 4:16 cpw port hfss

hi,
I have a similar probem.
I want to simulte CPW ,and I expect the structure of CPW give the standard impedance 50 Ohm.Because the substrate is thick silicon, lumped port seem
to be the better choice.
But the lumped port will not give the impedance result, and I have to provide impedance for the S-parameter results.
How can I solve this problem? Can anyone give me some suggestion?

Thanx!

EdmundZheng

Joined: 23 Oct 2004
Posts: 128
Helped: 9

15 Apr 2007 13:36 hfss cpw lumped port

I give you an advice here, after finished your simulation, you must select port to plot vector-E, to make sure the E field is right. if it is not right, you can change the dimension of port. hope this helpful!

Edmund

Azulykit

Joined: 18 Feb 2007
Posts: 851
Helped: 103
Location: All over the Map.

06 May 2007 8:39 waveport cpw hfss

CPW transmission lines often cause significant grief as they are "mode rich". I generally use wave ports in my analysis. Read the section on Impedance calculation in HFSS help. You will probably want to use the Zpi form and an impedance line. Make sure the mode and impedance line make sense by examining the port field configuration for each mode. You don't say if you are using single ended or differential CPW lines or if you have a lower ground plane. If the lines are differential, are they tightly (close) or loosely(wide spacing) coupled? Depending on these details the situation will change.

When all is done, I like to compare the results to Polar Instrument's calculator (or similar tool) to confirm that the results are reasonable. I specifically do not mean to imply that I think Polar is a better tool. I use it as a sanity check to help detect a blunder.

sama

Joined: 05 Aug 2007
Posts: 9

11 Nov 2007 12:48 hfss coplanar waveguide.hfss

hi,
i have a question. if we use wave port mode for cpw feed line, how many modes do we need to describe? one or two? if we use one mode , the field in that side of antenna feed line described will b more strong than other.

Deepa.r

Joined: 20 Jan 2008
Posts: 3

18 Feb 2008 16:42 hfss waveport for cpw

I have a similar problem. I m simulating a cpw fed patch antenna. I m using a waveport. But the fields at the waveport dont correspond to CPW mode. I have tried varying the size of the waveport....but with no improvement.
Has anyone successfully simulated CPW fed antennas in HFSS. Does HFSS handle CPW properly? Could someone tell me the correct steps in setting the CPW feed.

tcamargo

Joined: 18 Feb 2008
Posts: 4

27 Feb 2008 22:39 hfss cpw feed

thanks
it will help me a lot

daniel1024

Joined: 29 Apr 2008
Posts: 2

29 Apr 2008 13:33 wave port cpw hfss

thx very much.....
i have a similar questions in a long time.

youwin0125

Joined: 07 Jun 2008
Posts: 4
Helped: 1

07 Jun 2008 4:29 assigning port of coplanar waveguide hfss

thanks
it will help me a lot

i really want this

Added after 2 minutes:

I design MMIC in CPW structure

but dont know how to simulate SPW in HFSS

thx a lot