| Owing to the complex and variation of the wireless communication environment,the antenna is developing in the direction of integrating multi-function,it can achieve the ability of frequency construction,pattern construction,and polarization construction.Presently research about the corresponding task,pattern reconstruction is normally achieved by the complex construction,and almost about the certain characteristic construction;while this thesis adopts the simple construction to achieve the pattern reconfigurability,and combines the two characteristics of the antenna,frequency and pattern,to achieve the construction by using the less PIN diode to attain better abilities,therefore the research on pattern reconfigurable and hybrid reconfigurable antenna has some certain meaning.This thesis includes the following contents:1.A pattern reconfigurable antenna based onthe SIR(stepped impedance resonator)structure has been proposed.SIR structure is a type of stepped-shaped resonator,served as reflector.While the PIN diodes are loaded on the SIR structure,it can alter the shape.SIR structure is served as three directors when the PIN diodes are off state,SIR structure is served as reflector when the PIN diodes are on state.The radiating unit of the antenna is mainly the central dipole,through maintaining the PIN diodes on SIR structure to achieve the twitch between directional and omnibearing,State 1 covers the range from 2.03 to2.73 GHz,State2 covers the range from 2.28 to 2.74 GHz,State3 covers the range from 2.04 to 2.77 GHz,the gain of State1 and State2 is 5.7d Bi,the gain of State3 is 2.7d Bi,possessing the characteristic of simple construction and the miniature.2.Awideband pattern reconfigurable antenna based on the SIR structure has been proposed.The radiating unit of the antenna is the central dipole,the SIR structures lied on the two sides of thedipole act as director and reflector,the PIN diodes on the SIR structures are used to twitch the pattern between directional and omibearing,adopting two small SIR structures to improve the gain of the antenna.State1 and State2 cover the range from 2.19 to 3.9GHz,State3 covers the range from 2.28 to3.96 GHz,the gain of State1 and State2 is 4.8d Bi,the gain of State3 is 2.2d Bi,possessing the characteristic of wideband and stable quality3.A pattern and frequency reconfigurable antennahas been proposed.The main radiating dipole is central monopole.Throughmaintaining the PIN diodes between radiating patch and ground,the reconstruction of frequency and pattern is realized,the antenna has four states in total.State2 and State3 cover the range from 3.5 to 4.05 GHz,State1 covers the range from 3 to 3.8GHz,State4 covers the range from 5.09 to 5.71 GHz.The gain of State1 is 2.2 d Bi.The gain of State2 and State 3 is 3.3d Bi,the gain of State 4 is 3.5d Bi... |
