Multi-band internal monopole antenna for mobile station

In this paper, we propose a multi-band internal monopole type antenna for mobile station. We design and implement the multi-band internal monopole type antenna for cellular (824 ~ 894 MHz), GPS (Global Positioning System: 1,575.42 MHz), K-PCS (Korea - Personal Communication Service: 1,750 ~ 1,870 MHz) and S-DMB (Satellite-Digital Multimedia Broadcasting: 2,630 ~ 2,655 MHz) frequency bands with three branch lines. The antenna size of example design is 42.5 mm times 7 mm times 6.5 mm. Ground size is 67 mm times 42 mm, and the proposed antenna is located at the 3 mm away from the top portion of ground plane. The proposed antenna shows a monopole-like radiation pattern. Measured peak gains are -1.63 dBi at 0.859 GHz, 1.76 dBi at 1.575 GHz, 3.89 dBi at 1.810 GHz and 5.57 dBi at 2.642 GHz.