Abstract
A new type of spoof surface plasmon polaritons (SSPPs) developed from conventional substrate integrated waveguide (SIW) using ring slots and vias is proposed in this paper. The asymptotic frequency and lower cutoff frequency of the SSPP structure can be easily tuned by changing the width of SIW walls and radius of the ring slot, respectively. A trapezoidal microstrip line and a small ring slot are used for the efficient mode conversion to smoothly transit from microstrip line to the proposed SSPP structure. The presented SSPPs have a flat bandpass filtering response with adjustable center frequency and bandwidth. In order to better verify the transmission and cutoff characteristics, two bandpass filters using the proposed SSPPs with relative bandwidths of 61.7% and 76.4%, respectively, are fabricated and measured. Good agreement between the simulations and measurements verifies the proposed design idea.
Highlights
Surface plasmon polaritons (SPPs) are surface electromagnetic waves in the optical frequency band that propagate along the metal-dielectric interface but decay rapidly in the vertical direction [1]
In 2004, Pendry et al proposed a periodic metal hole array that supports SPP-like surface mode having strong field confinement in the lower frequencies, which was named as designer or spoof SPPs [2]
Various planar ultra-thin spoof SPPs (SSPPs) have been proposed for the design of bandpass filters (BPFs) [3,4,5,6,7], frequency splitters [8] and leaky wave antennas [9,10]
Summary
Surface plasmon polaritons (SPPs) are surface electromagnetic waves in the optical frequency band that propagate along the metal-dielectric interface but decay rapidly in the vertical direction [1]. Compared with the traditional microwave filters, such as coupled line filters [11,12,13,14], waveguide filters [15,16,17], the SSPP based filters have the advantages of tunable bandwidth and fast design period through observing the dispersion characteristics of the SSPP unit cell, which are a good candidate for the 5G or internet of thing applications [18]. In this paper, based on the traditional SIW, a new type is proposed through loading ring slots and vias. The bandpass filtering obtained with the help of SIW’s high-pass characteristics, and the bandw tuned without increasing the size of the waveguide. The bandpass filtering response can be Analysis of SSPP Waveguide Developed from SIW obtained with the help of SIW’s high-pass characteristics, and the bandwidth can be tuned without increasing the size of the waveguide. Figure with different bandwidths are fabricated and measured to validate the design idea
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