A Dual-Mode Dielectric Filter for 5G System

Abstract

Based on 5G system, a cylindrical dual-mode resonator and filter are designed. The electric field distribution characteristics of each mode of the dual-mode resonator are analyzed by using high-frequency electromagnetic field simulation software. Based on the designed dual-mode resonator, through theoretical calculation and analysis, a 5G system dielectric dual-mode filter is designed by using the RF / microwave simulation software ADS/HFSS. The coupling between modes is realized by setting metal screw perturbation on surfaces. The effect of two coupled degenerate modes is equivalent to that of two coupled resonators, so that the number of resonators can be reduced while the resonant circuit remains unchanged. For example, two modes of a resonator can be used in a traditional n-section filter, the same physical space realizes the characteristic of 2n section filter, which greatly reduces the size of the filter. A 5G system dielectric filter is designed based on dual-mode resonator. The results show that in the pass-band (3.4 ∼ 3.5GHz), the return loss is more than 18db, the insertion loss is less than 0.3dB, the zero on the left side of the pass-band is 3.1716GHz, the zero on the right side of the pass-band is 3.8537GHz, the VSWR is less than 1.28. Transmission zeros are introduced on both sides of the pass-band, which improves the suppression ability out of pass-band. The 5G system dielectric filter has the advantages of low insertion loss, small size and good suppression performance out of pass-band. When applied to 5G wireless communication system, the anti-interference ability and stability of the system can be improved.