| Since the late 1970s, the international antenna community has devoted much effort to the theorectical and experimental research on microstrip antenna, which offers the advantages of low profile, light weight, easy to manufacture, compatibility with integrated circuit and conformability to a shaped surface. All these research results are widely applied in military field such as aircraft, missiles and rockets but also in commercial areas such as mobile satellite communications, the broadcast satellite system, global positioning system (GPS), remote sensing. In the family of microstrip antenna, microstrip reflectarray has been given attention increasingly and widely since its combined features of array antennas and reflector antennas, especially for phased microstrip reflectarray, because of whose merit of beam scanning, became a focus and tough work. For the time being, the phased microstrip reflectarray is not popular. In this thesis, a cylindrical Cassegrain microstrip reflectarray antenna with a fixed beam deviation angle in the azimuth is designed, and an approach to realize phased microstrip reflectarray is presented. Based on the scheme, a phase shifter is designed and manufactured. Our approach is available to any cases of arbitrary polarization and can be applied for scanning in two dimensions. The detailed tasks include:1. By using HFSS software, phases of reflected fields of stub loaded rectangular microstrip patch reflectarray and stub loaded aperture-coupled microstrip patch reflectarray are computed. The results show that the latter possesses the wide-band characteristic.2. A microstrip array antenna is designed and manufactured to work as the feed of the Cassegrain antenna system.3. A microstrip reflectarray cylindrical Cassegrain antenna system is designed, which has an fixed beam deviation angle in the azimuth. Then, We manufactured and tested it.4. A phase shifter based on the 3dB directional coupler is designed, manufactured, measured and validated. |
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