Research And Design On Planar Of Reconfigurable Antenna

In recent years ,wireless communication system need a wide-band and high speed. Based on this requirement, the concept of reconfigurable antenna was posed and it has been the focus in the antenna field. Reconfigurable antenna has a solution to the problem of traditional communications equipment., so it has very high value in engineering.Three antennas design was proposed in this thesis. by analyzing the simulation of these antennas, this thesis verify them.Firstly, this thesis discuss the antenna knowledge briefly. such as the reconstruction mechanism and the advantages of the reconfigurable antenna.Secondly,,a frequency- reconfigurable antenna based on the Minkwoski structure is proposed. By switching the states of this antenna, the design have multiple frequency points under the same pattern radiation.Thirdly, this thesis propose a double feeds antenna . The simulation results show that this antenna can achieve the reconstruction of the radiation pattern between the two frequency points.Finally, a reconfigurable micro-strip patch antenna with a square slot in the center by introducing parasitic truncated corners to achieve polarization diversity is proposed . By using the diodes, the proposed antenna can radiate with either right hand circular polarization (RHCP) or left hand circular polarization (LHCP).