摘要 本論文主要是在於探討超寬頻(Ultra-Wide Band, UWB)天線的設計以及馬刺狹孔(Spurline)在加強天線間隔離度(isolation)的應用。首先，利用共平面波導(Coplanar Waveguide, CPW)的結構作為此超寬頻天線的饋入電路，再設計出反射損耗值( )在UWB頻段(3.1GHz~10.6GHz)皆小於-10dB的超寬頻天線，並成功地實際製作於FR4的微波基板上。將模擬值與量測值加以比較，發現其有良好的一致性。此外在論文中，將二個超寬頻天線並列在一起，且此二個天線共用其共平面波導的接地平面，利用馬刺狹孔其類似帶拒濾波器(Bandstop Filter)的特性，來降低天線間共接地平面上的電流，因而提高特定頻率的天線隔離度。此結構亦實作於FR4基板上，並且成功地提高了在8.4GHz的隔離度，所量測的結果與模擬相當地吻合 。 Abstract In the thesis, the design of Ultra-Wide-Band(UWB, 3.1GHz~10.6GHz) antennas and the application of the spurline on the isolation enhancement between antennas are discussed. The antennas are first designed using IE3D full-wave electromagnetic simulator, and then fabricated on the FR4 printed-circuit board. Measured return loss, which is better than 10dB from 3.1GHz to 10.6GHz, is in good agreement with simulation. To increase the isolation between two UWB antennas, a spurline filter is placed on the edge of the common ground of the antennas. The edge current excited due to the radiation of the antennas is successfully reduced by the spurline. The design is also fabricated on FR4 substrate. The measured isolation increases about 10dB at 8.4GHz and is in good agreement with simulation.
