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In this paper, a new planar miniaturized diplexer is proposed for GSM/DCS dual band cellular phone applications. The design is composed of four sections of a recently proposed planar artificial transmission line (ATL) which is used to replace the conventional series quarter-wavelength transformers and the shunt open-circuited stubs. The experimental results reveal that the proposed diplexer features low insertion loss, high isolation and compact size. At the center frequency of the GSM system, the occupied size of the proposed miniaturized diplexer is merely 24.4 mm times 17.6 mm, or equivalently 0.119 lambdag times 0.086 lambdag . The design methodology, simulated and experimental results are discussed throughout the paper.

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 lambdag 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.