| Summary: | 碩士 === 明新科技大學 === 電子工程研究所 === 99 === As the fast development of the wireless telecommunication industry the quality of wireless telecommunication services is improved by paying great attention on the efficiency and performance in a wireless communication system. There are many studies to achieve better radiation characteristics of antenna by controlling the radiation patterns.
Therefore, the development of antenna is very robust. And make a show of a different feature along with the different times. For example, cellular phone antenna how do smallerly even can conceal and let user Hun however don't feel a green cellular phone And how only Be operated to manies with the same antenna repeatedly the segment become a dual-band, three repeatedly or much and repeatedly antenna. How design the pattern of antenna to let user in spite of can receive the signal of same strength in distance and neighboring districts must depend on a design just can reach.
This paper presents a variety of bands with half wavelength multi-frequency and square-ring printed dipole antenna. And design into a 1 x 2 of the array antenna make make gain increment. Using IE3D simulated and experimental measurements obtained in the S11 <-10dB conditions of operating frequency range can cover 866 to 962MHz and 1660 to 2810 MHz. So it has the multi-band characteristics. Therefore, this multi-band printed dipole antenna can be effectively applied such as GSM(890~960MHz)、DCS(1710~1850MHz)、PCS(1850~1990MHz)、UMTS(1920~2170MHz)、WiFi(2402 ~ 2480MHz) and WiMAX（2500~2690MHz）wireless mobile communication systems.
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