Abstract
In this paper, we propose a scheme to construct a new type of ultra-compact rejection filter by loading split-ring resonators (SRRs) on the transmission line of spoof surface plasmon polaritons (SPPs). From the dispersion analysis of the spoof SPP transmission line with and without the SRR loading, we clearly reveal the mechanism of the rejection characteristic for this compact filter. Meanwhile, we fabricate two spoof SPPs waveguides loaded with different amounts of metamaterials particles, and experimentally test them using an Agilent Vector Network Analyzer (VNA) and a homemade near-field scanning system. Both the simulated and measured results agree well with our theoretical analysis and demonstrate the excellent filtering characteristics of our design. The isolation of both filters can be less than −20 dB, and even reach −40 dB at rejection frequencies. The proposed rejection and stop-band filters show important potentials to develop integrated plasmonic functional devices and circuits at microwave and terahertz frequencies.
Highlights
Due to the shortage of spectrum resource, the filter plays a very important role in modern wireless communication system[1]
In order to overcome this problem, we proposed a method to control the electromagnetic (EM) field in sub-wavelength scale through the interaction between spoof surface plasmon polaritons (SPPs) and metamaterials (MTMs) particles, and control the frequency spectrum of the whole circuit or system
The excellent characteristics of SPPs are still in great demand in low-frequency circuits because the optical design cannot be directly used in low frequency bands because metals act as perfectly electric conductor (PEC) other than plasma with negative permittivity
Summary
The proposed band-rejection filter is illustrated in Fig. 1, containing the spoof SPPs waveguide and located SRRs units. We notice the stop-band beyond the cut-off frequency of the spoof SPPs. In order to visually verify the rejecting performance of the design, we show the simulated and measured near electric field distribution of the spoof SPPs TL and the rejection filter with five SRRs, as shown in Figs 5 and 6. We adopt the five SPP-SRRs design in the discussion of this miniaturization If we recognized the tiny blue shift is acceptable, the miniaturization whole length of our design is 41.5 mm, which is less than double of wavelength at center of rejected band
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