ABSTRACT
Digital Audio Broadcasting (DAB) has been adopted in many countries as a new generation broadcast system. Handheld DAB receivers, either DAB alone or embedded in smart phones, are becoming popular in DAB-covered countries. The typically 1.5-meter wavelength of the DAB RF signal and the small size of the terminal pose challenges to the design of the antenna for handheld DAB receivers. In this paper, an earphone antenna using the earphone common line is reported. The working theory of the circuit is analyzed and a reference circuit is proposed. The circuit has been used in several commercial DAB radios and proved to be efficient.
