Concavo-convex dipole for DTV/GSM applications

In this article, a compact planar dipole antenna for both digital television signal (DTV) reception in UHF band and mobile communications in the GSM850/900 band is presented. Broadband operation of the proposed dipole antenna is obtained by successfully exciting its half-, and one-wavelength modes which are further adjusted to be at close frequencies to form a broadband characteristic. To successfully excite the one-wavelength modes to provide the upper frequency portion, a notch was cut in one arm of the proposed dipole antenna. Moreover, a narrow strip protruded from another arm extended into the notch largely shifts the one-wavelength mode toward lower frequency. Also, the longitudinal edge of the notch is meandered to shift the whole operation band toward lower frequency. The operation bandwidth of the proposed antenna is greatly enhanced to be about 73% via a compact dimension.