Table 2.

Comparison of recently reported microstrip strain sensors.

Reference	Patch Shape	Frequency [GHz]	Sensitivity [kHz/µε]	Patch Size [mm2]	Sensitivity/ Patch Size Ratio [kHz/µε·mm2]	Dielectric
This work	rectangular	2.725	−2.379	832.28	−0.002858	FR4
This work	dSRR	2.725	−1.548	77.44	−0.019990	FR4
[8]	rectangular	17.2	−17.2	21.32	−0.806754	Kapton
[10]	rectangular	3	−2.54	N/A	N/A	RT Duroid 5880
[13]	circular	2.5	−2.05	1123.59	−0.001825	FR4
[17]	first iteration of Sierpinski curve fractal	2.725	−2.35	778.24	−0.003020	FR4
[17]	second iteration of Sierpinski curve fractal	2.725	−1.36	333.54	−0.004077	FR4
[17]	third iteration of Sierpinski curve fractal	2.725	−1.18	184.59	−0.006393	FR4
[18]	rectangular	2.469	−2.847	1138.36	−0.002501	FR4
[19]	rectangular	7.31	−3.43	750	−0.004573	PDMS
[22]	double patch sensor	2.75	−2.82	823.28	−0.003425	FR4