Research And Design Of Tunable Planar Miniaturized Antenna Based On CRLH-TL

With the development of wireless communication system towards miniaturization,integration and multi-function,antenna as its transceiver is as same.In miniaturization,compared with the traditional miniaturization technology,the use of Composite Right/Left-Handed Transmission Line to realize the miniaturization of antenna has the advantages of low loss and flexible design.In the aspect of multi-function,the tunable antenna emerges as the times require,and an antenna can meet a variety of applications.In this paper,the miniaturized tunable antennas are studied,the specific content and work are as follows:1.Three frequency tunable miniaturized SIW antennas based on Composite Right/Left-Handed Transmission Line are studied and designed.First,a SIW miniaturized antenna is designed by using the Zero-Order Resonance characteristic of the Composite Right/Left-Handed Transmission Line.On this basis,a SIW full-mode frequency electrically tunable miniature planar antenna is realized by introducing a varactor.Based on the same design idea,the half-mode and quarter-mode electrically tunable SIW antenna are designed respectively,and the further miniaturization of the electrically tunable antenna is realized.The resonant frequency range of the three antennas are:2.29GHz-2.55GHz?2.37GHz-2.59GHz?2.3GHz-2.57GHz;the electric size are 0.18₀*0.17₀?0.19₀*0.09₀?0.1₀*0.12₀,₀ is the wavelength of 2.29GHz?2.37GHz?2.3GHz;the maximum gain are 0.75dB?-0.45dB?-2.9dB.Three antennas are measured,and the simulation results are in agreement with the measured results.2.The frequency tunable asymmetrical coplanar waveguide miniaturized antennas with short-end and open-end are studied and designed respectively.First,using the characteristics of Composite Right/Left-Handed Transmission Line,an acpw short-end miniaturization antenna is designed,on the basis of this,by changing the value of inductance,frequency tunable is achieved and the tunable range is 1.51GHz-1.96GHz,the size of radiation patch is 0.037₀*0.026₀,₀ is the wavelength of1.51GHz,the maximum gain is 0.7dB.Then a miniaturized antenna with open-end is studied and designed.The resonant frequency of the antenna is 1.6GHz,the size of radiation patch is0.046₀*0.033₀,₀ is the wavelength of 1.6GHz,the maximum gain is 1.88dB.