A Wideband Transition from Microstrip Line to Microstrip Spoof Surface Plasmon Polariton Line for Microwave/Millimeter-Wave Applications

Table 1

Comparison with previously reported transitions.

	Type of SSPP	Bandwidth (GHz)	F.B.W. (%)	Transition length	Transition occupation ratio (%)
[3]	Groundless SSPP	22.5-42	60.5%	0.6933 λ	39.13%
[4]	Groundless SSPP	4.5-11.5	87.5%	0.933 λ	48%
[5]	Groundless SSPP	5-8	46.2%	0.589 λ	58.9%
[6]	Groundless SSPP	3.2-5.8	27.3%	2.403 λ	146.85%
[7]	Groundless SSPP	6-12	66.67%	1.8 λ	180%
[8]	Groundless SSPP	2.2-10	63.9%	0.4473 λ	57.95%
[15]	Dual metallic strip	3.1-17.5	139.8%	1.236 λ	103%
[16]	Grounded SSPP	0-13	200%	0.1456 λ	14.56%
[17]	Grounded SSPP	0.1-8	197.5%	0.567 λ	56%
[18]	Grounded SSPP	1-7	150%	0.533 λ	53.33%
This work (p =1 mm)	Grounded SSPP	1-40	190.24%	0.3417 λ	34.18%
This work (p =2 mm)	Grounded SSPP	1-22	182.6%	0.46 λ	44%
This work (p =3 mm)	Grounded SSPP	1-12	184.61%	0.39 λ	39%