Compact Folded Meander-Line Harmonic Tag Antenna for Insect Tracking

This awork presents a novel single layer dual-band meander-line harmonic tag antenna implemented on a thin flexible substrate. The proposed prototype consists of folded asymmetric meander-line dipoles that are matched to a low-voltage Schottky diode to generate second harmonic frequency of 5.8 GHz when illuminated by a fundamental frequency of 2.9 GHz. The proposed tag achieves fractional bandwidth of 1.67% at 2.9 GHz with compact size of 0.14 × 0.12 of the wavelength. The proposed tag antenna has 2.09 dBi gain at 2.9 GHz and 1.38 dBi at 5.8 GHz.