Research And Design Of Multi Frequency Dielectric Resonator Antenna For WLAN Application

Since the beginning of the 21 st century,with the rapid development of wireless communications,the application of Wireless Local Area Networks has become more widespread.At present,the commonly used WLAN standards are IEEE802.11 a and IEEE802.11 g.At the same time,in order to meet more radio communication services,the channel department added 5.8 GHz to the standard of WLAN.IEEE 802.11 g is a dual-band standard of 2.4 GHz and 5.2 GHz.Therefore,it is meaningful to study how multi-frequency antennas applied to WLANs can not only enable antennas to be flexibly used in various frequency bands,but also can greatly save costs.The dielectric resonator antenna has the advantages of small size,flexible design,and easy integration.Its high-gain,wide-band characteristics are also well suited for designing multi-band antennas for use in the frequency bands.This article first introduced the development of the dielectric resonator antenna at home and abroad and the frequency bands of WLAN.Secondly,the basic theory,analysis method,main parameters and feeding methods of dielectric resonators are introduced.Then,the factors that realize the multi-frequency of the dielectric resonator antenna are summarized.Through the simulation of the dielectric resonator antenna in the foreign literature,we can further understand the method of realizing high gain and multi-frequency.Finally,on the basis of reference to domestic and foreign literature,the following two models of multi-frequency dielectric resonator antennas applied to WLAN are simulated by electromagnetic simulation software:1.The dual-band "T" dielectric resonator antenna for WLAN applications.Through simulation optimization of the cube cut at both ends of the "T" type dielectric resonator,a dielectric resonator antenna with higher gain and satisfying WLAN dual frequency is obtained.In the simulation results,the bandwidth with a return loss of less than-10 d B is 17.48%,covering the WLAN frequency band of 5.2GHz and 5.8GHz;the maximum gain in the operating bandwidth is in the z-axis direction,and the value is 5~6d Bi;the antenna has good directivity The overall antenna structure is simple and the size is only 51×59×21.6(mm3).2.The tri-band dielectric resonator antenna applied to WLAN.The dielectric resonator is made up of two pieces of dielectric resonators,which increases the bandwidth of the antenna by reducing the effective dielectric constant of the uniform dielectric resonator,thereby realizing multi-frequency.With the slot-coupled feed method,a dielectric resonator antenna with higher gain and satisfying WLAN tri-band is obtained.In the simulation results,the frequency band with a return loss of less than-10 d B has four segments.The first segment is 2.33 GHz to 2.47 GHz and the bandwidth is 5.83%.The second segment is 3.51 GHz to 3.63 GHz and the bandwidth is 3.36%.The third segment is 5.18 GHz ~ 5.22 GHz,the bandwidth is 0.77%;the fourth paragraph is 5.71 GHz ~ 5.86 GHz,the bandwidth is 2.59%.Among them,the first two and four paragraphs cover the three frequency bands of the WLAN.The maximum gain in the operating bandwidth is 4~11 d Bi;the antenna has good directivity;the overall antenna structure is simple and its size is only 48×48 ×20.1(mm3).