Abstract
The paper introduces a novel structure of a dual-band filtering Wilkinson power divider (WPD). Its essential component is a dual-band bandpass filter (BPF), implemented using coupling lines and two T-shaped resonators. The BPF is incorporated into the divider structure to suppress the unwanted harmonics within the circuit. The latter is achieved owing to a wide stopband of the filter. The designed dual-band WPD can suppress third unwanted harmonics in both channels with high levels of attenuation. The designed dual-band WPD operates at 2.6 GHz and 3.3 GHz with a return loss of 22.1 dB and 22.3 dB at the operating frequencies. Furthermore, the insertion loss and isolation are 0.3 dB and 20.2 dB at 2.6 GHz and 0.9 dB and 24.5 dB at 3.3 GHz. The analysis and simulation results are corroborated by the measurements of the fabricated divider prototype. The competitive performance of the proposed circuit is also demonstrated through comparisons with state-of-the-art divider circuits from the literature.
Highlights
Power dividers belong to the class of important microwave components, widely used in microwave and communication circuits such as amplifiers [1,2,3,4] and antenna feeding networks [5,6,7,8,9,10,11]
The resonator marked as Part 1, indicated in Figure 2, controls the pole frequencies, and the suppression band attenuation level in the low pass filter
Realization of a satisfactory suppression band in the dual-band power divider requires the design of a dual-band filter
Summary
Power dividers belong to the class of important microwave components, widely used in microwave and communication circuits such as amplifiers [1,2,3,4] and antenna feeding networks [5,6,7,8,9,10,11]. Another technique is utilization of coupled lines, which can be incorporated into the divider structure to realize dual- or multi-band operation [29,30,31,32] This method can be employed to achieve broadband performance, but it may increase the insertion loss in the passband. The aim of this research is to demonstrate the usefulness of incorporating T-shaped resonators and coupled lines in the development of dual-band WPDs. The specific divider structure proposed in the paper is designed to operate at 2.6 GHz and 3.3 GHz. An important component of the circuit is a dual-band filter, implemented to ensure suppression of the unwanted harmonics. Simulation and measurement data indicate superior performance of the presented circuit in terms of return and insertion losses, port isolation, as well as harmonic cancellation, which make it competitive over state-of-the-art divider structures reported in the literature
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