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A MINIATURIZED TRIPLE-BAND BRANCH-LINE COUPLER BASED ON SIMPLIFIED DUAL-COMPOSITE RIGHT/LEFT-HANDED TRANSMISSION LINE

By G.-C. Wu, G. Wang, L.-Z. Hu, Y.-W. Wang, and C. Liu

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Abstract:
A miniaturized triple-band branch-line coupler based on the simplified dual-composite right/left-handed transmission line (S-D-CRLH-TL) is proposed in this paper. The electromagnetic characteristics of S-D-CRLH-TL are analyzed by the simulator and equivalent circuit model, and the results prove that there are three frequencies with phase of -90° in the passbands; this characteristic can be applied in designing triple-band quadrature microwave components. The proposed branch-line coupler is fabricated and measured, the measured and simulated results are in good agreement with each other, showing that the triple-band operating at 3.06 GHz, 4.00 GHz and 5.54 GHz, the useful bandwidths are 2.97 GHz-3.16 GHz, 3.82 GHz-4.12 GHz and 5.48 GHz-5.67 GHz. In addition, compared with the conventional branch-line coupler, the whole size of the proposed one is 17 mm × 14.4 mm (0.173λ × 0.147λ) (λ is the wavelength in low frequency), it realizes a 73% size reduction. Moreover, compared with the triple-band branch-line coupler based on the double-Lorentz transmission line metamaterial, the proposed branch-line coupler is more effective in the situation, which is sensitive to phase-changing, as the sign of phase difference in the two outputs at the three frequency points keeps the same.

Citation:
G.-C. Wu, G. Wang, L.-Z. Hu, Y.-W. Wang, and C. Liu, "A Miniaturized Triple-Band Branch-Line Coupler Based on Simplified Dual-Composite Right/Left-Handed Transmission Line," Progress In Electromagnetics Research C, Vol. 39, 1-10, 2013.
doi:10.2528/PIERC13030811

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