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文章介绍了阶梯阻抗谐振器SIR(Stepped-Impedance-Resonators)的结构和原理,分析了这种结构谐振器的优越性,在此基础上采用3级半波长(λg/2)谐振器设计了一种应用于无线局域网WLAN(Wireless LocalArea Network)系统(IEEE-802.11a/b/g)的双频带通滤波器,这种滤波器的特点是其寄生响应可通过阻抗比(RZ)和谐振器的长度进行调节。使用仿真软件HFSS进行仿真,并对其进行加工测试,仿真结果和测试结果的稳合很好,在两个中心频率为2.4 GHz和5.2 GHz的通带内,插入损耗分别小于0.6 dB和0.9 dB,相对带宽分别为7.8%和7.7%,且两通带间的抑制特性好,频率为3.5 GHz～4.2 GHz之间的抑制损耗达到60 dB,各项指标满足工程设计要求。
The article introduces the structure and principle of Stepped-Impedance-Resonators and analyzes the superiority of this kind of structure resonator. On the basis of this, a 3-level half-wavelength (λg / 2) resonator is used to design a A dual-band band-pass filter applied to a Wireless Local Area Network (WLAN) system (IEEE-802.11a / b / g) is characterized by its parasitic response via impedance ratio (RZ) Length adjustment. The simulations were carried out using the simulation software HFSS. The simulation results were in good agreement with the test results. The insertion loss was less than 0.6 dB and 0.9 dB respectively in two passbands with center frequency of 2.4 GHz and 5.2 GHz , The relative bandwidths are 7.8% and 7.7%, respectively, and the suppression characteristic between the two passbands is good. The suppression loss between the frequencies of 3.5 GHz and 4.2 GHz reaches 60 dB, and the indexes meet the engineering design requirements.