Printed internal antenna for mobile broadcasting (DVB-H/T-DMB) and communications (GSM900)

Abstract

This study proposes a printed internal antenna operating in the digital video broadcasting-handheld (DVB-H) band and the terrestrial digital multimedia broadcasting (T-DMB) L-band for mobile broadcasting and the GSM900 band for mobile communications. Owing to the limited physical size of the mobile terminal, the miniature antenna technique is very important for a low-band application. The proposed antenna consists of a printed rectangular monopole with a U-shaped slot, an extended ground stub and a folder-type chassis, which are easily printed on an FR4 substrate. The antenna occupies an area of only 50 x 27 mm(2), which makes it attractive for use with modern multiband and multifunctional slim handsets. The combined behaviour of the antenna resonant mode and the chassis resonant mode is utilised without any matching circuits or magneto-dielectric materials. In addition, the proposed antenna uses a second higher-order resonance of the extended ground stub and the U-shaped slot.