Patent ID: 7102575
Filing Date: 2006-09-05
Classification: H01Q

Abstract:
1. A PIFA antenna apparatus, comprising: an RF input/output; and first and second antenna surfaces having respective contacts to a ground for a mobile communications terminal, wherein only the first antenna surface is connected to the RF input/output, and the second antenna surface is particularly arranged to not touch the first antenna surface such that the first and second antenna surfaces are electromagnetically coupled, with a first designated area being provided, which is substantially surrounded by the first antenna surface, within which the second antenna surface is particularly arranged, the first designated area being one of a separate surface and a cutout within the first antenna surface; wherein the first antenna surface is designed for two independent frequencies, the second antenna surface is designed for a third independent frequency, the first antenna surface is open at one side, and a size of a free surface between the first and second antenna surfaces is selected to produce a desired input impedance for the antenna apparatus at the third frequency.