Coplanar Waveguide Low-Pass Filter Based on Butterfly-Shaped Spoof Surface Plasmon Polaritons with Compact Size and Constant-Width Transition

Moznebi, Ali‐Reza; Afrooz, Kambiz

doi:10.1007/s11277-023-10546-6

Cited by 2 publications

(1 citation statement)

References 33 publications

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“…Also, because the length of SSPP units will affect the cutoff frequency of the filter, various methods and structures have been proposed to achieve a lower asymptotic frequency on a smaller size. For example, the miniaturization is achieved by transforming the traditional rectangular-shaped SSPP units into ring cavity units [11], T-shaped SSPP units [12][13][14], M-shaped SSPP units [15], metallic curve spiral units [16], dumbbell-groove units [17], and butterfly-shaped SSPP units [18], respectively. Nonetheless, the size in the longitudinal direction has not been solved.…”

Section: Introductionmentioning

confidence: 99%

Compact wideband filter with wide stopband using transition-free spoof surface plasmon polaritons

Ren,

Qin,

Guan

et al. 2023

J. Phys. D: Appl. Phys.

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In this article, a newly spoof surface plasmon polaritons (SSPPs) is proposed and used to design a compact wideband bandpass filter (BPF). Different from the traditional SSPPs unit cell with one shaped structure, the unit cell of the proposed SSPPs consists of H-shaped slotline and a bilateral T-shaped slotline. Benefiting from the hybrid structure, no transition portion is needed for impedance matching in the design of microwave filter, which highly reduces the horizontal size of SSPPs-based filter. The transition structure of microstrip to slotline provides a capacitance with highpass frequency response, which enables the realization of a passband by cooperating with the natural lowpass property of SSPPs. Also, the upper and lower cutoff frequencies of the proposed filter can be adjusted independently by the key parameters. Besides, a wide upper stopband can be obtained by properly designing the SSPPs unit cell and the microstrip to slotline structure. Finally, the well-designed BPF operated at 1.3-6.2 GHz and its upper stopband rejection reaching 20 GHz is fabricated and measured. The test results are in good agreement with the simulations, which verifies the feasibility of the proposed structure and design method.

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