Multi-band Internal antenna for DVB-H and GSM services

The digital video broadcasting-handheld (DVB-H) service is a new standard for delivering live broadcasting television to handheld terminals and it utilizes UHF bands IV and V (470-862 MHz). However, since the upper limit of the DVB-H frequency band is within a measurable distance of the lower limit of the GSM 900 frequency band, the upper limit will probably be restricted to channel 49 (698 MHz) to relax requirement for a rejection filter [1]. To maintain the interoperability with commercial mobile service, the multi-band internal antenna is required. The wideband antennas for DVB-H service have been studied [2-3]. However, these antennas have larger size than commercial internal antennas. A multi-band antenna usually consists of a few radiators to obtain multiple resonant frequencies and each resonant frequency is tuned by adjusting the length of an individual radiator and the coupling between radiators [4-5]. However, it is difficult to independently tune the resonant frequency of an antenna because of the electromagnetic coupling between radiating elements forming an antenna. In this paper, a multiband internal antenna for DVB-H and GSM services is proposed. 2. Antenna Design