PIFA ANTENNA SYSTEM FOR SEVERAL MOBILE TELEPHONE FREQUENCY BANDS

摘要

The aim of the invention is to develop a small-sized structure for a plurality of resonance frequency bands in a PIFA antenna system for at least two mobile frequency bands distant from each other comprising a ground connection (G) and a HF power supply connection (S). For this purpose, The inventive PIFA antenna system comprises at least two antenna branches (Z1, Z2) which are disposed essentially side-by-side and in parallel to each other in the form of a strip and are connected to each other at a base thereof (F, F1) in order to serially connect the antenna branches (Z1, Z2) which extend at a predetermined distance from each other, thereby forming a slit (SP) and are provided with straight segments for producing a capacitance coupling between the branches (Z1, Z2). The ground connection (G) is arranged at the free end (FE) of one (Z1) of the antenna branches, the HF power supply connection (S, S1) is mounted on the external edge of the branch (Z1) of the PIFA antenna structure provided with the ground connection (G). The width (W, W2) of the antenna branches (Z1, Z2), the length (B1, B2) thereof and the slit (SP, SP1) therebetween are calculated in such a way that said PIFA antenna structure is provided with two resonance frequency bands arranged at a desired distance to each other.