Application of metamaterials in polarization control, RCS reduction and antenna design
The research is about the application of metamaterials in polarization control, RCS reduction and antenna design. The goal of the next research stage is as follows: Task 1: Polarization converter based on metamaterials. Studying the operating principle of polarization manipulation of metamaterials-based polarization converter. Based on the existing research results, the analysis method and design flow of the metamaterial polarization converter are summarized, and several broadband and high efficiency polarization converters are designed. Task 2: Apply the method to other traditional antennas for wide CP radiation. Taking patch antenna as an example, metamaterials have been introduced to enhance bandwidth in many literatures, while it is still a challenge to ensure wideband as well as low-profile and miniaturization. This work requires systematic theory to design metamaterials and patch antenna. I will study two schemes, one is reactive impedance surface (RIS) or electromagnetic band-gap structures based patch antenna for CP radiation or multi-band radiation. Another is metamaterials-based reflector for CP antenna. Task 3: Develop the methods and structures so that it can apply to reconfigurable antennas. The purpose is to further research the metamaterials-based CP antennas and allow the approach and design to be used for reconfigurable antennas, such as polarization reconfigurable antennas, radiation pattern reconfigurable antennas. Task 4: Study composite right/left-handed transmission lines (CRLH TLs) theory and investigate its applications in antenna design. CRLH TLs have been widely used in the design of microstrip antenna owing to their easy fabrication and special properties. To date, a number of works have been published on their zeroth-order resonance (ZOR) mode for miniaturized antennas and symmetric modes for dual-band or multi-band operating. However, most of these researches are concentrated on linearly polarized antennas. I will study its characteristics and apply it to CP antennas, includes dual-band or multi-band multi-polarizations operating. Task 5: Investigate reflection and transmission of metamaterials and develop its applications for high-gain antennas. In this part, I will focus on high gain CP Fabry-Perot (F-P) resonator antennas with metamaterials-based superstrate for wide operating bandwidth as well as low Radar Cross Section (RCS). There are several researches about this, but how to broaden 3-dB AR bandwidth, wide 3-dB gain bandwidth as well as RCS reduction bandwidth with simple design is not an easy work.