Efficiency of PIFA antenna

i have designed a a simple PIFA antenna for L1 GPS band, i have achieve all parameters S11, impedance, bandwidth very well, except efficiency. i am receiving very poor effieciency of only 3%. Do any of have an idea why i am achieving very low effieciency.


thanks

Your antenna has low efficiency due to high loss (metal loss , dielectric loss , surface loss) .

The first way can effectively increase your efficiency is to larger your size.

Normally, the design small size for antennas will get low efficiency.

farooqel, the following is the parameters obtained from HFSS
for a PIFA antenna on FR4. As you can see even for FR4 which
a notoriusly bad for RF the efficiency is high. 96%
You must be doing something wrong, but it is difficult to tell
without the model or some more information

Hi Jallem

Iam doing simulation on PIFA antenna, similar to yours, in IE3D.

Actually I would like to redo the simulations in HFSS.

Could you please upload your hfss-file for your PIFA-antenna ?

Thanks in advance.

Best regards

hilper

Actually, for PIFA design, the ground plane size place a significant role. And the feed structure is also.

the efficiency value in HFSS seems not right, I usually got very high efficiency, sometimes even higher than 1, I have no idea why it happens. Did anyone come accross similar problem?