Spoof surface plasmon polariton beam splitters integrated with broadband rejection filtering function

Abstract

In this paper, a new kind of spoof surface plasmon polariton (SSPP) beam splitter integrated with band-rejection filtering functions is presented. Firstly, the mechanism of single-band rejection phenomena of the SSPP transmission lines (TLs) with and without T-shaped decorations are revealed through dispersion analyses. Based on the single-band rejection filter, multi-band rejection filters are further designed by introducing different intervals between the symmetric T-shaped decorations. Furthermore, we construct a compact Y-shaped beam splitter integrated with a broadband band-rejection filtering function using the SSPP TLs, which consists of an SSPP TL with rectangular grooves and two filtering branch SSPP TLs. Multiple band-rejection integrated beam splitters can also be realized by incorporating different intervals between the T-shaped decorations. The integration of the SSPP beam splitter and band-rejection filter offers compact areas, lower insertion loss and controllable passband features. It is strongly believed that that the proposed idea will raise promising possibilities in the integration of multiple microwave functions in the same component, e.g. filtering antennas, filtering switches, multifunctional radiofrequency (RF) passive and active components capable of performing several RF analog signal-processing functions in the same circuit volume, and so on.

Balanced Filtering Power Divider based on Odd-mode Hybrid Microstrip and Slotline Spoof Surface Plasmon Polaritons

“…Spoof surface plasmon polariton (SSPP) structure can support the surface wave alike surface plasmon polaritons (SPPs) at microwave frequency, and the SSPPs show the similar characteristics of electromagnetic field confinement, upper cut-off frequency with the SPP at optical frequency band [6,7]. Hence, in recent years, the SSPP transmission lines have been widely adopted for designing microwave filters [8,9], diplexers [10], phase shifters [11,12], antennas [13], splitters [14][15][16][17], etc.…”

“…In particular, some well-designed power dividers are reported based on SSPP structure fed by the coplanar waveguide (CPW) [14][15][16], and double-sided parallel spoof surface plasmon polariton transmission line (DSP-SSPP-TL) [17]. In [15], a four-way SSPP splitter is designed by the SSPP transmission line.…”

“…The transition structure constructed by the long axis of a half oval ring is used to match the wave vector between the CPW mode and the SSPP mode. Furthermore, a beam splitter with multi-band rejection is implemented based on SSPP structure with T-shaped decoration [16]. In addition, the DSP-SSPP-TL is also adopted for designing balanced dividers with ultra-wideband isolation by loading the lumped resistors [17].…”

Defects Detection Method Based on Programmable Spoof Surface Plasmon Polaritons in Non-Metallic Composites

“…Compared with the traditional transmission line structures, SSPPs has advantages of anti-interference, miniaturization, low crosstalk, etc. Therefore, SSPPs became a research hotspot in the microwave field [21][22][23], such as permittivity measurement [24], concentration measurement [25], defect detection [26], etc. However, the stability of these methods is affected.…”

Terahertz multi-frequency splitter and spoof SPPs switch

“…Asad Aziz innovatively proposed a compact Y-shaped beam splitter integrated with a broadband band-rejection filtering function. This idea will provide promising possibilities for integrating multiple microwave functions in the same component [7]. Zhou reported a power divider with an isolation-resistor inspired by spoof SPPs.…”