PIFA [Planar Inverted F-Antenna]

The animated TECHTip Tutorial is available here.

Here is another technical presentation on four types of Patch antennas:

• Conventional SP [Shorted Patch]

• Folding of a Conventional SP
• Folded SP
• Conventional Rectangular Patch

The length of a rectangular patch can be reduced from a /4 to /8 wavelength by inserting a folded patch called a stacked shorted-patch structure. The resonant frequency can be varied by changing the distance between the upper and lower shorted-patches. That is, moving the upper and lower patches closer together lowers the resonant frequency.

The upper patch can be considered as a capacitive load (acting like a capacitor) resulting in a decreased resonant frequency. This approach is called a capacitively load patch antenna. The folded patch antenna is sometimes referred to a PIFA [Planar Inverted F-Antenna].

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[tags]pifa,planar inverted f-antenna,shorted patch,sp,stacked shorted-patch structure[/tags]