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Help me widen the bandwidth of a PIFA design

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imranshoaib

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PIFA Design

Hi,

I have simulated a PIFA for 900 and 1800 MHz GSM bands. The simulation has been carried out in Agilent ADS2005A. I want to widen the bandwidth. Can anyone, who has some knowledge of PIFAs and ADS, have a look on the project files (*.zip) attached herewith and modify the design? OR can anyone send me his/her PIFA design simulated in ADS?

My email address is imran.shoaib@hotmail.com

Cheers!
 

Re: PIFA Design

hi imranshoib,

I'm using IE3D simulator which is very good for planar antenna simulations.I dont have ADS.
Can u send me the paper or doc regarding dimensions of your pifa so that i can help u in this regard.
Go thr those books which i've mentioned in my earlier thread. Hope u'll get some solutions.................
regards,
balaguru.
 

Re: PIFA Design

Hi, I am currently working on my bachelor proyect which consists of an antenna for a handheld device which works on the frequency ISM band of 902-928 Mhz. I've read a lot of internal antennas and I've concluded that the best antenna would be a PIFA antenna.
My problem is that, with my lack of experience, I cannot figure how would be the antenna mounted(constructed) on the PCB. For example, how does the shorting plate and the feed source connect to both the PCB and the antenna? (using SMA, coax)

Another doubt that I have is that the PCB actually consists of four layers, in which the bottom layer and one of the internal layers are both ground planes. Would the fact of having two ground planes affect the performance of the PIFA?

Thanks a lot for your help!
 

Re: PIFA Design

Yes Ground plane will play the major role in PIFA in case of Pattern and returnloss.
Attached are the figures of antenna in mobile phone.

Normally two pads will be there in PCB out of which one is shorted to ground through vias which is soldered to the sorting pin of PIFA and other pad is connected to the feeding probe.
 

Re: PIFA Design

Thaks for your answer balaguru thavamani! So there is no air between the PIFA antenna and the PCB?
Once I get the best design of my PIFA, do you know where should I have it constructed? Sorry for the questions but I have zero experience in practical issues!
 

Re: PIFA Design

buhoale said:
Thaks for your answer balaguru thavamani! So there is no air between the PIFA antenna and the PCB?
Once I get the best design of my PIFA, do you know where should I have it constructed? Sorry for the questions but I have zero experience in practical issues!
Click to expand...

It depends upon your design.
Some types of PIFA are printed on PCB and are elevated from Main PCB(eg Mobile)
 

Re: PIFA Design

Thanks again for your answer.. do you have examples on PIFA antennas simulated in HFSS? That would be amazing!
 

PIFA Design

Hi all,
I'm a final year degree student. i'm also designing a PIFA using CST MWS with 800MHz, 900Mz, 1800MHz, 1900MHz and 2100MHz. However, i face problem on broaden those bandwidth to fullfill those services requirement. i have a post with my project detail on


any1 have any idea about this?
Thank you!
 

Re: PIFA Design

buhoale said:
Thanks again for your answer.. do you have examples on PIFA antennas simulated in HFSS? That would be amazing!
Click to expand...

U can find in this forum.
I'm not familiar with HFSS.
 

Re: PIFA Design

buhoale said:
Thaks for your answer balaguru thavamani! So there is no air between the PIFA antenna and the PCB?
Once I get the best design of my PIFA, do you know where should I have it constructed? Sorry for the questions but I have zero experience in practical issues!
Click to expand...

In practical design, the PIFA patch is mounted on a plastic structure.
 

Re: PIFA Design

hey all

why do you simulate a 3D structure like PIFA in a 2.5 SW (ADS, IE3D)?
shouldn't you use a 3D SW like HFSS or CST?
 

PIFA Design

Simulation of this antenna in ADS ( 2.5D simulator) is very fast as compair to 3D tool like HFSS and CST.
 

Re: PIFA Design

it may be fast but also inaccurate.
all the planes are infinite and the via modelin is not good.
 

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