volume | PIER Journals

Abstract

In the paper, a wideband four-way filtering power divider with arbitrary power division ratio and input absorptive feature is proposed. Two sets of coupled lines (CLs) are used to achieve the wideband performance. To obtain absorptive properties, a set of T-type absorption structure consisting of two isolation resistors and a λ/4 short-circuit stub is connected between the two CLs. Meanwhile, high frequency selectivity and good out-of-band rejection are realized by introducing two stepped-impedance resonators. Besides, output impedance matching, isolation and unequal power distribution are achieved by the power division section in the second stage. In the analysis, the equations are derived by using the method of even-odd mode decomposition and voltage-current method. For demonstration, a prototype is designed, fabricated, and measured with the power distribution ratio of 2:1:1:2. Measurements show that an all-frequency band absorption of 200% is obtained with the 3-dB passband bandwidth of 78.1% and the out-of-band rejection of 14 dB. Besides, it also shows 15-dB isolations within more than 60% FBW, and has the feature of small size.

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Dr. Shuyi Chen

Dr. Hongmei Liu

Dr. Teng Ma

Dr. Zhongbao Wang