标题: | 平面式阵列漏波天线回波器设计 Design of Planar Leaky-Wave Retrodirective Antenna Arrays |
作者: | 邱建智 Chien-Chih Chiu 林育德 Yu-De Lin 电信工程研究所 |
关键字: | 回波器;漏波天线;微带线;阵列;再辐射场;散射场;平面天线;波前;Retrodirective Reflector;Leaky-Wave Antenna;Microstrip Line;Array;Re-radiated Field;Scattered Field;Planar Antenna;Wave Front |
公开日期: | 1999 |
摘要: | 本论文探讨一个由漏波天线建构而成具有二维回波效果的回波反射器的设计,由于平面性的结构,使得回波器具备了轻薄、低成本的优势,依循着反射器之宽扫描仰角对于入射源的高回波量特性,我们设计的回波器非常合适于智慧型运输系统的应用。使用漏波天线建构回波器的优点是,可以避免以往传统二维效果反射器连接布线网路之复杂性。本论文中设计了由八个漏波天线所组合而成的阵列回波器,并且针对设计及量测皆有详尽的探讨,亦采用了一个近似的方法来分析我们设计的回波器之再辐射与散射效应;针对X频段的分析可以帮助了解回波器的运作,来自回波器的总反射量分成两个主要部分;其一为来自漏波天线的再辐射场,另一为来自金属接地平板的散射场,再辐射场是以导波管模组和映射定理来计算,金属接地平板的散射场则是以物理光学的方法来分析,实验结果显示了在电场与磁场切平面中,回波阵列相对于金属接地平板的反射量在10分贝内有着高回波场量;于电场切平面有着230度、磁场切平面有着110度的高宽度反射仰角。 A two-dimensional Van Atta retrodirective reflector based on the microstrip leaky-wave antennas was designed in this thesis. Planar structure makes this reflector low cost and low profile. Along with the reflector’s property of being able to reflect high fields toward the source point over a wide range of incident angles makes it very suitable for applications in intelligent vehicle highway systems (IVHS). Using the leaky-wave antenna as the basic constructing unit has the advantage of avoiding complex routing of the connecting network commonly encountered in two-dimensional retrodirective array. An eight-element leaky-wave retrodirective array was designed and measured in this thesis. An approximate method associated with the re-radiated and scattered principles of the reflector is presented at X band for the purpose of understanding and designing the reflector. The total reflected field from the reflector is separated into two primary parts, the re-radiated field from the leaky-wave antennas and the scattered field from the metal ground plane. The re-radiated field is calculated by using waveguide model together with the image theory; the scattered field from ground plane is analyzed by the physical optics (PO) method. The experimental results show that both in the E-plane and H-plane the array has a high reflected field within 10dB down from that of a flat metal plate over a range of more than 230 degrees in the E-plane and 110 degrees in the H-plane. |
URI: | http://140.113.39.130/cdrfb3/record/nctu/#NT880435070 http://hdl.handle.net/11536/65907 |
显示于类别: | Thesis |