为了实现移动基站的整体体积更小，其中的滤波器的小型化非常有必要，基于非

In order to achieve a smaller overall size of the mobile base station, the miniaturization of the filter is very necessary. Based on an asymmetric stepped impedance resonator (SIR), a miniaturized dual-band filter with two passband center frequencies and adjustable bandwidth is proposed. The design method of frequency band bandpass filter, using HFSS to design and simulate the dual-band filters of 0.9 GHz and 1.8 GHz for mobile base stations. The filter is based on the open SIR, plus 2 internal quasi-lumped stubs, and they resonate to produce 2 different passbands, of which 0.9 GHz is related to the parameter size of the external SIR, 1. The 8 GHz frequency depends on both external SIR and internal parameter size. The size of the filter is 24. 76 mm × 13. 5 mm (not including the length of the feeder at both ends). The experimental results show that the simulated S parameters are good, and the 3dB bandwidth also meets the index, which proves the feasibility of this method.

In order to realize the smaller overall volume of mobile base station, the miniaturization of the filter is very necessary, based on asymmetric step impedance resonator (SIR), the design method of miniaturized dual band pass filter with two pass band center frequency and adjustable bandwidth can be adjusted is proposed, and HFSS is used to design and simulate 0. 9 GHz and 1. 8 GHz dual-band filter. The filter is based on an open SIR, plus 2 internal quasiset total short intercepts, and they are resonant to produce 2 different bands, of which 0. 9 GHz is related to the parameter size of the external SIR, 1. The 8 GHz frequency depends on both the external SIR and the internal parameter size. The filter size is 24. 76 mm ×13. 5 mm (excluding feeder lengths at both ends). Experimental results show that the simulation S parameters are good and the 3dB bandwidth is in line with the indicators, which proves the feasibility of this method.

In order to reduce the overall volume of mobile base station, it is necessary to miniaturize the filter. Based on asymmetric stepped impedance resonator (SIR), a design method of miniaturized dual band bandpass filter with two pass band center frequencies and adjustable bandwidth is proposed, The 0.9 GHz and 1.8 GHz dual band filters for mobile base stations are designed and simulated by HFSS. On the basis of open sir, two internal quasi lumped stubs are added to the filter, and two different passbands are generated by their resonance. The 0.9 GHz frequency is related to the parameter size of external sir, while the 1.8 GHz frequency depends on both external Sir and internal parameter size. The size of the filter is 24.76 mm × 13.5 mm (excluding the length of feeders at both ends). The experimental results show that the simulation s parameters are good, and the 3dB bandwidth also meets the index, which proves the feasibility of this method.<br>