在本文中，我們提出一種創新的導波護蓋，可大幅低使用者身體對手機電磁波的吸收量。金屬片狀形式與光伏面板構成之導波護蓋配置於手持雙埠MIMO裝置上，藉由適當地設計耦合結構與天線間的耦合量，可在幾乎不影響天線阻抗下，將天線輻射電磁能量，導入導波護蓋與天線接地面所構成的漏波結構，並朝遠離使用者頭部的方向輻射。本導波護蓋無需調整原MIMO天線結構，可直接套於手機外殼上。經由模擬與實驗結果驗證，我們提出的兩種導波護蓋，皆可確實大幅降低2.6 GHz WiMAX MIMO手持裝置天線之比吸收率。導波護蓋採用市售之矽晶光伏單元製作，而參考手機尺寸與市場現有之智慧型手機規格相當，有助於快速導入市場。

In this paper, we present an innovative wave-guiding structure for reducing EM power absorbed by human body. A MIMO handheld device with the proposed wave-guiding structure, constructed of metal patch or photovoltaic panel, can effectively reduce its SAR value. The radiation efficiency and frequency response are affected slightly when the proposed structure is presented. Thus the wave-guiding structure with thin profile can be easily integrated with mobile phone or as an add-on protecting case without modifying the existing antennas. Two types of wave-guiding structures for a 2.6 GHz WiMAX MIMO handheld device are constructed and measured. The simulated and the measured results confirm the effectiveness of our proposed SAR-reducing structure. The wave-guiding structure can be constrictured by comerical crystalline silicon photovoltaic cells and is designed for normal-size smart phone with short time to market.