Help on PIFA: wideband/multiple band compact antenna design

Hi,

I am currently doing the wideband/multiple band compact antenna design. The frequency band aims at covering 138 - 2500 MHz, even 138 - 6000MHz. VSWR=2:1 for all frequency bands. Dimension restriction: Must be compact design, height must be less than 6in. Ground size: O.D. 3feet max. Power rating: 200W min total for all channels.

I am thinking to try with PIFA. Would anybody like to give me some suggestion about how to make a PIFA satisfying VHF/UHF band? What's the dimension I could start with?

Of course, I am open to any other feasible suggestion how to design such an antenna.

Thank you so much in advance.

PIFA is relative narrow band antenna, not in the case this huge frequency ranges you are looking for.

Yes, you are right. However, I currently aim at designing PIFA in the frequency of 138 MHz to 174 MHz. Any suggestion about the dimension and the antenna configuration? Thank you in advance.

PIFA get the resonance when the W + L = λ/4 (it depends also by substrate height and permittivity).
where W and L are the width and length of the active element.

So, the dimensions of the PIFA for 138MHz will be large (almost 30cm long).

For lower dimensions I would recommend for this band a printed helical antenna or a meander monopole.

http://www.ursi.org/Proceedings/Proc...%280770%29.pdf

PLZ help : PIFA on EBG Substrate for bluetooth : please suggest some methods to enhance the efficiency of the antenna which is coming around 64%.
thanks and regards

sakshi

hey vfone
can you sed this link again

this link give an error

thnx