Miniature Internal Penta-Band Monopole Antenna for Mobile Phones

摘要

A compact T-slit monopole antenna with slotted ground plane in the mobile phone for penta-band operation is proposed. In this configuration, the antenna comprises a T-slit monopole printed on the top ungrounded portion of an FR4 substrate of small size of $47times 5.4 {rm mm}^{2}$ and a slotted ground plane etched on the back side of the substrate of size of $47times 10 {rm mm}^{2}$. In addition, an inverted-L copper strip is soldered to the end edge of the monopole for extending the electrical length of the antenna for GSM band; that is, the proposed antenna occupies a small volume of $47times 10times 5 {rm mm}^{3}$ inside the mobile phone and is suitable to operate as an internal antenna. By controlling the related parameters, the proposed antenna can resonates at different operating bands to cover GSM850/900 and DCS/PCS/UMTS operations independently.