Design of a compact stacked wideband Modified-PIFA with ferrite loaded

In this paper, we present a compact stacked wideband Modified-PIFA with ferrite loaded, working at the upper part of the VHF and the lower part of the UHF band. The antenna consists of two layers stacked thin copper with slots as the radiation plates,a common shorting plates and a L-shaped ground with slots. In order to reduce the size of the antenna, ferrite is used as the substrate and various shapes of slots are used to improve the bandwidth and impedance matching of the proposed antenna. By carefully adjusting and optimizing the size of the patches and slots, the two layers radiation patches generate three resonance frequencies close to each other, expanding the bandwidth significantly. The overall optimized dimension of the compact stacked wideband Modified-PIFA is 36 mm × 36 mm × 6 mm and its ground plane size is 61 mm × 48 mm × 8 mm. The measurement results show it can work perfectly between 256 MHz and 378 MHz, and the relative bandwidth is about 38.49%.It has the potential to be used in the wireless audio system.