Research And Design Of Filtered Dielectric Resonator Antenna For 5G Communication

With the rapid development of wireless communication technology,the requirements for miniaturization,integration,and high performance of radio frequency front-end circuits in communication systems are increasing.With more and more communication frequency bands and communication services,traditional filter antennas have been unable to meet the demand.It is of great significance to integrate the antenna and filter in the RF front-end circuit into a filter antenna to integrate the filtering and radiation functions.The thesis studies the dielectric resonator antenna,based on the filter coupling theory,systematically studies the multi-frequency of the filter antenna and improves the passband selectivity method,and from this the single/dual band dielectric filter antenna comprehensive design method is obtained.The main work and innovations are:(1)Design single/dual frequency dielectric resonator antennas based on dielectric resonators.By analyzing the radiation characteristics and resonance modes of the resonator,the relationship between the dielectric resonator frequency and its structural parameters is obtained.Then use this resonator to design a miniaturized,low-loss single/dual frequency dielectric resonator antenna.A single-frequency dielectric resonator antenna with a center frequency of 3.45 GHz and a dual-frequency dielectric resonator antenna with a center frequency of 3.45 GHz/5.2 GHz are realized.(2)Based on the new dual-mode resonator,a single-pass band filter for 5G communication(3.45GHz)and a single-band dielectric filter antenna are proposed.First,based on the topology of the dual-mode resonator,by analyzing the resonance characteristics of the resonator and extracting the relationship between the resonator size and frequency,a single-passband filter with independently controllable frequency is realized.Then,using the resonator coupling theory,the dual-mode resonator and the dielectric resonator antenna are coupled through the slot line(aperture)to design a single-band dielectric filter antenna with expanded bandwidth.By introducing source load coupling at the feeder end,a radiation zero is generated at the upper and lower frequency band edges of the filter and filter antenna respectively,improving the sideband selectivity of the single band filter and filter antenna.(3)Based on the new multimode resonator,a dual-passband filter for 5G communication(3.45GHz)and WLAN(5.2GHz)and a dual-band dielectric filter antenna are proposed.First,based on the topology of the multimode resonator,by analyzing the resonance characteristics of the resonator and extracting the relationship between the resonator size and frequency,a dual-passband filter with independently controllable frequency is designed and implemented.Then,using the resonator coupling theory,the multi-mode resonator and the dielectric resonator antenna are coupled through the slot line(aperture)to design a dual-band dielectric filter antenna.By introducing source load coupling at the feeder end,the radiation zeros generated by the structure are more abundant.Finally,the dual-passband filter and dual-band dielectric filter antenna generate four transmission zeros,which improves the sideband selectivity of dual-passband filter and dual-band filter antenna.