在本論文中，提出利用控制天現場型使得所設計之天線可容易符合SAR之要求，另外天線設計中也導入利用迴圈結構產生反向電流使能量較為分散，比較不容易形成集中型熱點，對降低SAR值亦很有幫助，並應用Adjacent Frequency 設計，採用多路徑產生多諧振，達到寬頻的效果。在本文所提第一種天線係採五分之一波長輻射體與從接地平面突出的印刷接地線結合之寄生金屬負載，其特性可以用於控制移動電話天線的近場。 文中研究了人類的手和頭部對本論文所提出的天線的阻抗帶寬和輻射特性的影響。 應用在CDMA，GSM和WCDMA頻帶中的24dBm的輸入功率和在DCS和PCS頻帶中的21dBm的輸入功率都滿足1.6mW / g的比吸收率（SAR）極限和M3和M4的助聽器兼容性（HAC） 水平。在本文所提第二種天線係可用於移動手機應用的新型多頻帶寬帶天線。具有短路線的不對稱T型單極天線被設計為在LTE（LTE，698MHz-960MHz，1710MHz-2170MHz，2500MHz-2690MHz）和無線網路（WLAN，IEEE 802.11ac，5150MHz- 5850MHz）頻帶。實驗結果證明，在800MHz，1900MHz，2600MHz和5500MHz下實現3：1的VSWR的帶寬分別為37.75％，24.63％，11.46％和21.76％。 LTE頻帶的輸入功率為24dBm，IEEE 802.11ac頻帶的輸入功率為13dBm時的比吸收率（SAR）滿足SAR限值1.6 mW / g。 實驗結果驗證了理論分析的預測。

In this thesis, it is proposed to use the control field to make the design of the antenna can easily meet the requirements of SAR, the other antenna design also introduced the use of loop structure to produce reverse current to make the energy is more dispersed, less likely to form a centralized hot spots, It is also helpful to reduce the SAR value, and the application of Adjacent Frequency design, multi-path to produce multi-resonant, to achieve the effect of broadband. The first propose antenna, it is shown that the one fifth wavelength radiator combines with a printed ground-line which protrudes from ground-plane jointly with parasitic metal-loading, which can be used to control the near-fields of a mobile phone antenna. The human’s hand and head effect on impedance bandwidth and radiation characteristics of the proposed antenna is studied. The input power of 24dBm in CDMA, GSM and WCDMA bands, and the input power of 21dBm in DCS and PCS bands all meet the specific absorption rate (SAR) limit of 1.6 mW/g and hearing aid compatibility (HAC) of M3 and M4 level. The second propose antenna, it is a novel multi-band broadband antenna for mobile handsets application. It is proposed and analyzed in this paper. An asymmetric T-type monopole antenna with a shorting-line is designed to be operated in long term evolution (LTE, 698MHz-960MHz, 1710MHz-2170MHz, 2500MHz-2690MHz) and wireless local area network (WLAN, IEEE 802.11ac, 5150MHz-5850MHz) bands. The experimental results indicate that the bandwidths for VSWR of 3:1 achieved were 37.75%, 24.63%, 11.46% and 21.76% at 800MHz, 1900MHz, 2600MHz and 5500MHz, respectively. The specific absorption rate (SAR) for an input power of 24dBm in LTE band, and an input power of 13dBm in IEEE 802.11ac band meet the SAR limit of 1.6 mW/g. Experimental results verify the prediction of the theoretical analysis.

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