Various types of electromagnetic shielding structures for specific frequency band have been reported in recent years. A gasket-free electromagnetic shielding structure using folded quarter-wavelength substrate integrated waveguide (FQ-SIW) resonators for 2.4-GHz band is one of them. In the structure, SIW resonators of different resonant frequencies in 2.4-GHz band are cascaded and positioned on inner walls of a gap. The structure is almost free of deterioration since contact-type gaskets are not used. In this paper, a gasket-free electromagnetic shielding structure for 2.4-GHz and 5-GHz bands using cascaded dual-behavior (DB) SIW resonators is proposed and evaluated. A DB-SIW resonator consists of two FQ-SIW resonators sharing one coupling slot and has two almost-independent resonant frequencies in the two bands. The design results showed attenuation characteristics at the two bands, and the configuration was miniaturized by 4% compared with conventional cascaded FQ-SIW resonators. Shielding effectiveness (SE) was also evaluated, and the measured results showed more than 20-dB improvement of SE near the two bands, though frequency shifts were observed.

中文翻译：

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使用级联双行为 SIW 谐振器的 2.4GHz 和 5GHz 频段无垫片电磁屏蔽结构

近年来已经报道了针对特定频带的各种类型的电磁屏蔽结构。使用折叠式四分之一波长衬底集成波导 (FQ-SIW) 谐振器的 2.4 GHz 频段无垫片电磁屏蔽结构就是其中之一。在该结构中，2.4GHz 频段内不同谐振频率的 SIW 谐振器级联并放置在间隙的内壁上。由于不使用接触式垫圈，因此结构几乎没有劣化。在本文中，提出并评估了使用级联双行为 (DB) SIW 谐振器的 2.4 GHz 和 5 GHz 频段无垫片电磁屏蔽结构。DB-SIW 谐振器由共享一个耦合槽的两个 FQ-SIW 谐振器组成，并在两个频段中具有两个几乎独立的谐振频率。设计结果显示了两个频段的衰减特性，与传统的级联 FQ-SIW 谐振器相比，该配置缩小了 4%。还评估了屏蔽效果 (SE)，测量结果表明，两个频段附近的 SE 提高了 20-dB 以上，但观察到了频移。