Patent ID: 6727854
Filing Date: 2004-04-27
Classification: H01Q

Abstract:
A planar inverted-F antenna (PIFA), wherein the planar inverted-F antenna has a first operating bandwidth and a second operating bandwidth, comprising:a ground surface; a shorting device; a radiating device coupled to the ground surface through a the shorting device, comprising: a first radiating element, wherein the first radiating element has a first resonance mode and a second resonance mode, and has a first effective length for providing a surface current pathway of the first radiating element; a second radiating element, wherein the second radiating element has a first resonance mode and a second resonance mode, and has a second effective length for providing a surface current pathway of the second radiating element; and a third radiating element, coupled to the first and second radiating elements, wherein the third radiating element has a first resonance mode and has a second effective length for providing a surface current pathway of the third radiating element, the first and second effective lengths each being greater than two times the third effective length; wherein the first operating bandwidth is defined by the first resonance mode of the first radiating element and the first resonance mode of the second radiating element and the second operating bandwidth is defined by the second resonance mode of the first radiating element, the second resonance mode of the second radiating element, and the first resonance mode of the third radiating element; a dielectric material set between the radiating device and the ground surface for isolating the radiating device from the ground surface; and a feeding device set on the ground surface and coupled to the radiating device for transmitting a microwave signal.