Conformal Antennas

Conformal Antennas

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alto64

Joined: 04 Feb 2002
Posts: 32

17 Jan 2003 10:15 Conformal Antennas

Is there any em simulator for the design of conformal (not planar) antennas?

Thanks in advance.

lindaknoll2002

Joined: 12 Jul 2002
Posts: 50

17 Jan 2003 20:50

You can always use 3D software like HFSS and CST.

loucy

Joined: 26 Aug 2001
Posts: 420
Helped: 10

18 Jan 2003 2:57

You can add Feko and WIPL-D.

egliu

Joined: 15 Jan 2003
Posts: 101

21 Jan 2003 4:09 re

it is difficult to use a commercial software, especially for a big antenna array. I know somebody using NEC modified by themself

loucy

Joined: 26 Aug 2001
Posts: 420
Helped: 10

21 Jan 2003 16:07

How do you modify NEC code to simulate for example a patch antenna? Replace the patch by many wires? How about the substrate?

sviodo

Joined: 02 Jan 2002
Posts: 87

21 Jan 2003 18:57

Friend of mine used and i have to add that he succesfully used a.n.s.o.f.t hfss. I'll be happy to hear some oppinions about cst mws in this field of use.

Regards,

egliu

Joined: 15 Jan 2003
Posts: 101

22 Jan 2003 5:26 re

hi loucy

facet is possible, I am also looking for a commercial software to design a conformal array for aircraft.

regards

Lupin

Joined: 22 Jan 2003
Posts: 326
Helped: 2

22 Jan 2003 11:47 Conformal antennas

I've been designing conformal patch array (on cylindrical surfaces) using CST MWS and results agree with the measurements.
On the other side, I've been using a self-made Matlab code but in that case, I don't rigorusly consider elements mutual coupling.

Hope it can help you.

alto64

Joined: 04 Feb 2002
Posts: 32

22 Jan 2003 13:41

Dear Lupin,

I've a self made matlab code based on the method of line. We can share our results to check their validity.

Hishamsaleh

Joined: 06 Jan 2003
Posts: 100

23 Jan 2003 2:59

search for Antenna NEC.zip in the downloads section. this software is really wonderful!

sviodo

Joined: 02 Jan 2002
Posts: 87

23 Jan 2003 10:53

maybe you could attach appropriate file, coz my serch queue returned no results of 'antenna NEC zip'....

loucy

Joined: 26 Aug 2001
Posts: 420
Helped: 10

23 Jan 2003 16:24

Can you guys give the number of elements in the array simulated with MWStudio or HFSS?

yingyang

Joined: 26 Dec 2002
Posts: 216

23 Jan 2003 16:56 large antenna

I have simulated 3 million by 3 million unknowns with nec.

loucy

Joined: 26 Aug 2001
Posts: 420
Helped: 10

24 Jan 2003 3:58

What computer you are using?

I am more interested in the number of antenna elements in the array, not the size of the unknows.

Lupin

Joined: 22 Jan 2003
Posts: 326
Helped: 2

26 Jan 2003 18:01

Does anyone have experience about slotted patch antennas, chiral and DNG materials or Superlensing effect?
You can join me and exchange informations in the forum about Slotted Patch antennas and chiral materials.

Thanks in advance
Lupin

Interests:
microstrip antennas, microstrip and strip line components, phased arrays.

Lupin

Joined: 22 Jan 2003
Posts: 326
Helped: 2

02 Feb 2003 17:10

Dera Alto64,
we can select an array layout, planar and conformal. To check our code we can analyze a typical configuration and give informations about Directivity, nulls positions, computation time and so on...
What do you think?

Regards
Lupin

alto64

Joined: 04 Feb 2002
Posts: 32

04 Feb 2003 10:57

Dear Lupin,

good idea.

Of course, we can open the discussion to all the people attending the forum.

Keep in touch.

Lupin

Joined: 22 Jan 2003
Posts: 326
Helped: 2

15 Feb 2003 18:11

Dear Alto64,
just to open the discussion and to check the validity of our codes, I just propose a configuration to be evaluated: at the beginning, we can analize
a planar array of 2 x 2 at 1.5 GHz, equally-spaced 0.7 lambda along x and y axis of a radiator whose pattern is cos(x).

let's compute:
Total Pattern on fi =0° and 90°, Directivity, nulls position.

Then we compare our results.
That's my idea, if you want to change the layout, let me know it ok?

Hope it can give us some help, ideas and interest to all the other people joining the section.

Regards
Lupin

alto64

Joined: 04 Feb 2002
Posts: 32

17 Feb 2003 14:17

Dear Lupin,
few questions about the configuration to be evaluated at the beginning:

1) which kind of dielectric substrate,
2) wihch kind of feeding (microstrip planar or verical probe),

are you thinking of.

Regards

Lupin

Joined: 22 Jan 2003
Posts: 326
Helped: 2

17 Feb 2003 15:27

Reading your question, I suppose you mean a planar array of patch antennas. If you don't mind, we can use as a single radiator element
a squared patch (side length about 100 mm) with a 3.0 mm thick dielectric.
The adopted material is air;
the patch is probe-excited and is located so that the Return Loss is < -20 dB;
Array Excitation: Uniform.

Tell me what you think about it and if we have to modify something.

Regards
Lupin

alto64

Joined: 04 Feb 2002
Posts: 32

17 Feb 2003 17:21

Dear Lupin,

here we are!

Keep in touch.

Lupin

Joined: 22 Jan 2003
Posts: 326
Helped: 2

18 Feb 2003 1:04

So,
considering a 2x2 planar array of squared patch antennas linearly polarized (H-Pol), considering a Uniform Amplitude and Phase excitation,
considering the elementar patch given by a probe-fed squared microstrip antenna the results are the following:

Directivity: 14.5 dBi
Beamwidth (-3 dB) : [-17.5° 17.5°] on fi =0°
Beamwidth (-3 dB) : [-19° 19°] on fi =90°
Nulls Position on fi =0° plane : [-46° +46°]
Nulls Position on fi =90° plane : [-46° +46°]
Computation time: about 30 seconds.
Can you also compute the contour plot?

Regards
Lupin

g86

Joined: 21 Jan 2003
Posts: 208
Helped: 4
Location: On top of antenna :))

25 May 2003 22:52

I feel to get exact comparison you should also give the patch dimension. And feed position. If everythin is same then I can try to get it simulated by IE3D. Can you attach the schematic of the array you have simulated.

Exclamation

Lupin wrote:

dragonlea

Joined: 28 May 2003
Posts: 14

29 May 2003 5:16

i don't think IE3D can do the work.it is based on MOM,SO it only can solve the 2.5D (planar)problem.
zealand FIDELITY can solve the 3D problem.it is based on FDTD.

Lupin

Joined: 22 Jan 2003
Posts: 326
Helped: 2

14 Jan 2004 13:48 Re: Conformal Antennas

Dear Alto64,
I've got no news about our planar array... In this time, I've enhanced my code.. now I can also study Crosspolarization Level and at the moment I'm working on conformal array. Can we still collaborate?

Regards
Lupin

axel

Joined: 09 Mar 2004
Posts: 2

09 Mar 2004 17:53 Re: Conformal Antennas

I have to say, although a lot of time has passed since dragonlea posted his reply on this topic, that he is not write about MoM software.

It's not true that MoM software can not solve 3D problems.

Quite contrary, it can solve them very efficiently if it is based on Surface Integral Equations.

I am using WIPL-D Pro v4.1, and I am very satisfied with it!

It is MoM based, but it solves any 3D structure with a relatively small number of unknowns, thus it is quite fast.
Besides, MoM solvers are generally the most precise around.

Regards

caocao

Joined: 23 Nov 2003
Posts: 117
Helped: 3

10 Mar 2004 16:35

Hi Lupin,
I have questions about you simulated fix antenna,could you tell which substrate did you choose?Roger,or Neltec,Arlon and so on?Did you think the conformal diecletric board is as good as the planar?
Thanks!
CaoCao

Lupin wrote:

So,
considering a 2x2 planar array of squared fix antennas linearly polarized (H-Pol), considering a Uniform Amplitude and Phase excitation,
considering the elementar fix given by a probe-fed squared microstrip antenna the results are the following:

Directivity: 14.5 dBi
Beamwidth (-3 dB) : [-17.5° 17.5°] on fi =0°
Beamwidth (-3 dB) : [-19° 19°] on fi =90°
Nulls Position on fi =0° plane : [-46° +46°]
Nulls Position on fi =90° plane : [-46° +46°]
Computation time: about 30 seconds.
Can you also compute the contour plot?

Regards
Lupin

Lupin

Joined: 22 Jan 2003
Posts: 326
Helped: 2

11 Mar 2004 11:02 Re: Conformal Antennas

Listen,
I've been using my own MatLab code (not e.m.) and an e.m. code to make a "cross" check. I don't remember exactly the substrate adopted, I should check.. anyway..the pattern of every element is considerable as a cos(x) in both principal planes.
My code permits also the insertion of an "embedded" single element pattern..Typlically, this process is followed to consider the mutual coupling.
The comparison between my code and the e.m. code about the analysis of a planar array of 2 x 2 elements is satisfying for me (the only slight difference is in array Gain level, e.m. considers this effect, my code doesn't).
I wanted other people to exchange informations and configurations.
Can udialog in this way?
I want to establish other configurations.. more and more complicated..(at the moment I'm working on conformal structures) so if u have a code (some of them can be found on the net, I've no tiime to use them), we can make parallel instructive analysis ok?

Let me know it

Best regards
Lupin

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