本論文中提出一款具有頻段選擇功能之平面耦合式天線設計，其設計概念為使用耦合PIFA型式及耦合開迴路型式，組成一具選擇頻段功能的天線，藉由簡單的旋扭開關，導通兩個不同的導通點做頻段的切換，並共用同一饋入點和同一輻射體的天線結構，在兩種不同型式的架構下，激發不同的頻段；在本實驗過程中，將本天線設計運用於手機和筆記型電腦中，成功的驗證此天線設計概念具有實際應用價值；本天線設計概念，與先前許多利用匹配電路達成低頻或高頻多頻操作，最大的不同是，不僅能克服低頻頻寬不足的問題，並且不會因為部分能量損耗於元件上，而使得天線效率不盡理想，無法在輻射效率特性方面滿足業界實際使用時所要求的規範，此外，簡單的機械式旋扭開關相較於電子式開關，在系統整合上，因為複雜度較低，相對的也降低生產所需成本。此設計不只是平面天線且利用機械式旋鈕開關，可分別操作在美規GSM850(824~896 MHz)/PCS(1850~1990 MHz)和應用在現今的歐規GSM900(880~960 MHz)/DCS(1710~1880 MHz)系統需求，藉由本天線設計概念可提升天線的操作頻寬並涵蓋五個應用頻帶GSM850/900/1800/1900/UMTS之寬頻操作，天線輻射效率也都可達到50%以上。

In this thesis, we proposed a planar coupling antenna design with the band selection function. The design is composed of a coupling PIFA model and a coupling open loop model. Using the simple fastening rotary switch to do the two different operating bands switch and those two kinds of models resonate at the different bands respectively; in this thesis, the proposed antenna is suitable to be applied to the laptop and mobile devices. Compared with the antennas using the electronic switch control to achieve the multi-band, there are some advantages of the proposed antenna. First, there is no extra energy loss at the components. Second, the cost of developing produces by using the simple fastening rotary switch is cheaper than the electronic switch. This design not only can operate in American’s operation GSM850 (824~896 MHz)/PCS (1850~1990 MHz), but can operate in Europe’s GSM900 (880~960 MHz)/DCS (1710~1880 MHz) systematic demand. Briefly, the antenna design which we proposed can cover the wide-band operation of the GSM850/900/1800/1900/UMTS operation. Above all, the obtained results show that the radiation efficiency of the antenna all can be more than 50% as well. Hence, these radiation efficiencies can satisfy with the requirement of industry.

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