新型S形EBG结构的超宽带基片集成波导带通滤波器

A New Ultra-wideband Bandpass Filter of Substrate Integrated Waveguide(SIW) Based on S-shaped EBG

利用S形电磁带隙结构的阻波特性,设计了一种基于EBG结构的基片集成波导(SIW)超宽带带通滤波器。该滤波器通过将不同大小的S形结构单元蚀刻在SIW上金属面,以获得超宽带。所设计的带通滤波器工作频带范围为7.85～10.21GHz,中心频率为9.03GHz,相对带宽为26.14%,通带内的最大插入损耗约为1.54dB,相比于文献[8～10]中类似EBG结构的带通滤波器,回波损耗较优,且具有结构紧凑、通带选择性好等优点。测量结果与仿真结果基本吻合,验证了该设计方法的有效性。

A novel S-shaped electromagnetic band gap （EBG） ultra-wideband band-pass filter based on sub-strate integrated waveguide （SIW） is proposed. The filter is designed based on the band-stop characteris-tics of EBG and can obtain ultra-wideband by etching different dimensional S-shaped on the surface of sub-strate integrated waveguide. The designed band-pass filter with a center frequency as 9.03 GHz and rela-tive fractional bandwidth 26.14% shows good band-pass characteristics with the frequency band between 7.85-10.21 GHz while the insertion loss is less than 1.54 dB and still the designed filter has the advan-tage of narrow band-pass, low insertion loss, compacted and good selectivity etc. that＇s better than the re-suits in the referrence[8-10], the good agreement between the measured results and the simulated results demonstrates that the design of this proposed filter is effective.