volume | PIER Journals

Abstract

This paper presents a 2.45 GHz/5.8 GHz circularly polarized RFID reader antenna based on an Artificial Magnetic Conductor (AMC) for detecting tagged objects in IoT applications. An efficient reader antenna is proposed to increase the interrogation distance and reduce the uncertainty in tag detection. The antenna consists of two dipole pairs printed on both sides of the substrate to operate at 2.45 GHz and 5.8 GHz, connected via feed delay lines in a cross-dipole configuration. The read range is further enhanced by a 5×5 AMC surface placed 0.042λ₀ below the printed antenna, where λ₀ is the wavelength at the lower resonant frequency. The AMC backing results in a gain of 7.1 dBi at 2.45 GHz and 9.41 dBi at 5.8 GHz, improving the read range of the reader. Impedance bandwidth is also enhanced to 2.25-2.91 GHz for the 2.45 GHz band and 5.1-6.3 GHz for the 5.8 GHz band, reducing tag detection errors. The axial ratio bandwidth of the antenna is 2.18-2.99 GHz at 2.45 GHz and 5.27-5.88 GHz at 5.8 GHz, ensuring circular polarization over the operating bands.

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Dr. Deepak Kumar

Dr. Naveen Jaglan