A Miniaturized Wilkinson Power Divider with Harmonic Suppression Characteristics Using Planar Artificial Transmission Lines

In this paper, a miniaturized Wilkinson power divider with harmonic suppression characteristics is proposed for ultra-high-frequency (UHF) radio frequency identification (RFID) applications. This design consists of four sections of a recently proposed planar artificial transmission line (ATL). The experimental results reveal that the proposed power divider features low insertion loss and compact size. At the center frequency of the UHF RFID system, the occupied size of the proposed miniaturized Wilkinson power divider is merely 13.4 mm X 22.4 mm, or equivalently 0.065 lambda_g X 0.109 lambdag . By utilizing the harmonic suppression nature of the ATL and two additional short-circuited stubs, this miniaturized divider also exhibits harmonic suppression characteristics over nearly a decade bandwidth. The design methodology, simulated and experimental results are discussed throughout the paper.