Novel Conformal RF Tag for Level Detection

This paper presents a novel conformal monopole antenna used for liquid level identification in tanks. Designing RFID tag antenna on a liquid detection is challenging due to the relative permittivity, high conductivity and the diversity of liquids. A comparison between planar and conformal designs has been done using a CST microwave studio simulator. The antenna has been fabricated on Roger 3850 flexible substrate material. The conformal Antenna has been designed to work on a cylindrical tanks made of PVC material. The proposed antenna resonance frequency is shifted forward from the planar antenna at 0.9 GHz to 0.8 GHz in conformal design. The impedance bandwidth is 0.29 GHz where a planar antenna gives bandwidth 0.35 GHz. The antenna gain is 2 dB in case of conformal antenna while is 2.28 dB in case of planar design.