Efficiency of PIFA antenna

[farooqel]

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

 

[tomcat_x]

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.

 

[jallem]

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

 

[hilper]

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

 

[cityu50395112]

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

 

[ssstar]

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?