Tri-band Planar folded inverted-F antenna

Image of the Tri-band Planar folded inverted-F antenna.

Another example of a very useful antenna for tri-band integrated applications (for example GSM/DCS and Bluetooth hand-held devices) is the Tri-band planar folded inverted-F antenna..

The radiating element is mounted above a conducting ground plane with slots etched out on both sides of the top and bottom metallization layers of the substrate, separating the layers into 5 sub-patches. This rather complex structure may be considered as a combination of simpler structures which interact co-dependently to achieve tri-band operation.

The typical performance for a design for the GSM and IEEE802.11 bands are shown below.

|S11| performance of a design for the GSM and IEEE802.11 bands.
Radiation pattern performance of a design for the GSM and IEEE802.11 bands.