Abstract
This paper presents a miniaturized microstrip branch-line coupler with good harmonic suppression performance. The proposed coupler consists of four branch-line sections, each of which is loaded by open-circuit stubs both at the center and the two ends. This type of loading can realize size reduction and harmonic suppression. As an example, a proposed branch-line coupler operating at 1.0 GHz is designed, fabricated and measured. The results show that the proposed branch-line coupler occupies 67% size of a conventional one and has better than 20 dB suppression from 1.9 to 5.8 GHz. Furthermore, the high slop of the transition band ensures good selectivity of the coupler.
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Supported by the National Natural Science Foundation of China (No. 51007040).
Communication author: Yang Guo, born in 1977, male, Doctor degree.
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Yang, G., Li, B., Kang, W. et al. Miniaturized microstrip branch-line coupler with good harmonic suppression performance. J. Electron.(China) 29, 132–136 (2012). https://doi.org/10.1007/s11767-012-0785-z
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DOI: https://doi.org/10.1007/s11767-012-0785-z