DESIGN OF A MULTIBAND ANTENNA FOR PORTABLE BROADCASTING SERVICES

Abstract

In this thesis, two compact antennas for TDMB and DVB-H / DAB bands are proposed for portable broadcasting services. A proposed antenna for TDMB is asymmetric dipole antenna using meandered structure and chip inductance, occupying a total volume of 7 × 7 × 100㎣. The length of antenna is about 0.06λ at the TDMB resonance frequency of 190 MHz. The proposed antenna has two resonance frequencies and covers the TDMB band of 174 MHz ~ 216 MHz in Korea. The antenna has good impedance bandwidth and radiation characteristics for the TDMB. DVB-H / DAB antenna is a monopole type antenna with long and short bar-shape metal plates, occupying a total volume 7 × 7 × 130㎣. By adjusting the gap distance between the long and short bar-shape metal plates, wide and dual band properties are achieved. The proposed antenna shows good impedance and radiation characteristics for DVB-H band (470 MHz ~ 870 MHz) and DAB band (1.45 GHz ~ 1.48 GHz). The measured return losses over the frequency band of interest are better than 10 dB. In addition, good radiation patterns are also obtained.