A Dual-band Strain Sensor Based On Pop-up Half Wavelength Dipole Antenna

Here we present a pop-up half wavelength dipole antenna with dual band operation for strain sensing applications. The proposed antenna is lightweight, low cost and easy to fabricate with a simple design based on a compressive buckling technique. This flexible strain sensor can measure 0 to 30% uniaxial strain with the frequency shift in the range of 2.45 GHz to 2.9 GHz in the first band and 5.5 GHz to 6.3 GHz in the second band. A prototype of the proposed structure was fabricated and tested. Measured results show a good correlation with the Finite Element Analysis (FEA) simulation.