由於在現今的手機中，基本上均使用單極天線來做為其天線，所以在此論文會先提及單極天線的量測，並且本論文得到其在1.84GHz以及2.6GHz的中心頻率下，銅線直徑與線長及線彎間距之間的關係式;再來延續單極天線的實測去做其在同一平面上的隔離度量測，而得到其在距離越大隔離度也能夠越好的結果。 而最後也是本論文主要的主軸，探討現今最火熱的長期演進技術之載波聚合，由此技術下去探討以及設計一個載波聚合天線，而從先前的研究去延伸，我們設計一個在同一個基板但不同平面的八面體天線，而以此載波聚合天線去測量其在不同面上的隔離度關係，而在相隔90度的面上，基本上就可以達到我們所需要的隔離度。 Basically monopole antenna is implemented in the current cell phones; it first in this study discusses the measurement process in the characterization of monopole antenna and then investigates the transmission characteristics of the antenna between its input and output ports. The implementation of the monopole antenna at center frequency of 1.84 GHz or at 2.6 GHz is then considered to find the relationships between the copper line diameters, line lengths and line curvatures etc. The isolation between antennas implemented in the same plane is then measured to validate the result that the longer the separation between antennas the better of their isolations. Carrier aggregation has been considered in LTE-A system to aggregate many component carriers to increase user’s transmission speed. It is the main task in this study to implement carrier- aggregated antennas. The design of octahedron antenna is considered and implemented on different planes but on the same template. The characteristics of implemented octahedron antennas such as the resulting antenna center frequency, bandwidth and antenna performance are all measured and compared. The process or the procedure to shift the carrier center frequency if it occurs carrier frequency offset or the tuning of the antenna to have its bandwidth increased are also studied. The separation angle between antennas implemented in the octahedron template is varied to investigate the resulting isolation between antennas at each possible separation angle. It concludes that in order to meet the LTE-A system requirement it needs to have greater than 90 degrees separation angle between antennas. 90 degrees separation angle is used in the final implementation of carrier-aggregated antennas.