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In this paper, an ultra-compact T-shaped component is proposed in order to achieve a spoof surface plasmon polariton (SSPPs) dual-functional device with beam steering and multiple band-rejection filtering functions. The newly introduced T-shaped component provides an excellent multiple band-rejection filter response when combined with the SSPP transmission line (TL), and can be regarded as an excellent alternative to metamaterial particles to conceive multi-band rejection of spoof SPP waves. Multi-band rejection filters are designed by introducing different intervals among the symmetric T-shaped components. Furthermore, we designed a compact SSPP beam-steering device integrated with a multiple band-rejection filtering function. The multiple band-rejection integrated beam-steering device can also be realized by incorporating different intervals among the T-shaped components, as mentioned in the case of linear filters. Integration of the SSPP beam-steering device and band-rejection filter offers compact areas and controllable passband features, which broadens the application range of SSPPs. In conclusion, the proposed T-shaped component is an outstanding addition toward the advancement of highly efficient ultra-compact dual-functional plasmonic devices.

In this article, we propose a novel approach to develop an ultra-compact spoof surface plasmon polariton (SSPP) band-rejection filter by loading T-shaped grooves on the SSPP transmission line (TL). This scheme is based on the interaction between two types of grooves, i.e. rectangular grooves of the SSPP TL and T-shaped grooves. This form of interaction has never been addressed before in order to achieve a highly efficient SSPP band-rejection filter. The working principle of this band-rejection filter is clearly revealed via investigation of the dispersion behavior of the SSPP TL in the presence and absence of T-shaped groove loading. Meanwhile, we simulate an SSPP TL loaded with T-shaped grooves. As proof of concept, we fabricate the filter in the microwave regime and perform an experiment which characterizes its functionality. The simulated and experimental results confirm the excellent filtering phenomena exhibited by our structure. The isolation of the filter can be less than −15 dB at rejection frequencies with excellent transmission efficiency in both passbands, before and after the rejection band. Furthermore, simulated near-electric-field results are also presented to demonstrate the authenticity of the filter. When the question of generating a highly efficient SSPP band-rejection filter arises, the proposed method facilitates us with T-shaped grooves, which are declared as an excellent alternative to metamaterial particles in this regard. The proposed band-rejection filter based on SSPPs demonstrates an outstanding capability to take part in the progress and the advancement of integrated plasmonic structures and systems at microwave frequencies.