A Design of Quad Band Internal Antenna for Hand-Held Mobile Phones

We propose a compact internal quard-band antenna with sufficient impedance bandwidths and gains for the GSM(Global Systems for Mobile), GPS(Global Positing System). DCS(Digital Codeless System), PCS (Personal Communication System) operation. The proposed antenna on a substrate. which is small enough to be installed in practical mobile phones, has heights of only 6mm from the substrate. In addition, the proposed antenna decreases the construction complex on the substrate. The GSM () GPS(1575MHz) DCS(). PCS() bands. Details of the design and analysis of the proposed antenna are described and the experimental results of the constructed prototype are presented.