volume | PIER Journals

Abstract

A miniaturized rat-race coupler with arbitrary power division ratio is proposed in this paper. The design formulas of the rat-race coupler with arbitrary power division ratio are derived using the even-odd decomposition analysis. The proposed structure demonstrates miniaturized size and perfect isolation due to adding phase inverter to the branch. For demonstration, a 20 dB rat-race coupler operating at 1 GHz with 81.34% size reduction is designed and fabricated. There is good agreement between measured and simulated results.

1. Park, M. J. and B. Lee, "Design of ring couplers for arbitrary power division with 50Ω lines," IEEE Microw. Wireless Compon. Lett., Vol. 21, 185-187, 2011.
doi:10.1109/LMWC.2011.2112341 Google Scholar

2. Chi, P. L., "Miniaturized ring coupler with arbitrary power divisions based on the composite right/left-handed transmission lines," IEEE Microw. Wireless Compon. Lett., Vol. 22, 170-172, 2012.
doi:10.1109/LMWC.2012.2189376 Google Scholar

3. Ho, K. L. and P.-L. Chi, "Miniaturized and large-division-ratio ring coupler using novel transmission-line elements," IEEE Microw. Wireless Compon. Lett., Vol. 24, 35-37, 2014.
doi:10.1109/LMWC.2013.2288261 Google Scholar

4. Xu, H.-X., G.-M. Wang, X. Chen, and T.-P. Li, "Broadband balun using fully artificial fractalshaped composite right/left handed transmission line," IEEE Microwave and Components Letters, Vol. 22, No. 1, 16-18, Jan. 2012.
doi:10.1109/LMWC.2011.2173929 Google Scholar

5. Hsu, C. L., J. T. Kuo, and C. W. Chang, "Miniaturized dual-band hybrid couplers with arbitrary power division ratios," IEEE Trans. Microw. Theory Tech., Vol. 57, 149-156, 2009.
doi:10.1109/TMTT.2008.2009036 Google Scholar

6. Pon, C. Y., "Hybrid-ring directional coupler for arbitrary power divisions," IEEE Trans. Microw. Theory Tech., Vol. 9, 529-535, 1961.
doi:10.1109/TMTT.1961.1125385 Google Scholar

7. Zhang, X. C., T. Y. Wang, and Y. B. Xiang, "Wideband three-way out-of-phase microstrip power divider," Electronics Letters, Vol. 51, 404-405, 2015.
doi:10.1049/el.2014.3915 Google Scholar

8. Zhang, X. C., C. H. Liang, and J. W. Xie, "Microstrip phase inverter using interdigital strip lines and defected ground," Progress In Electromagnetics Research Letters, Vol. 29, 167-173, 2012.
doi:10.2528/PIERL11121403 Google Scholar

9. Liao, Z. H., X. C. Zhang, and T. Y. Wang, "A novel dual-frequency phase inverter," IEEE International Conference on Ubiquitous Wireless Broadband, 1-2, 2016. Google Scholar

10. Liao, Z. H. and X. C. Zhang, "Reconfigurable phase inverter with switchable frequency," Electronics Letters, Vol. 53, 353-354, 2017.
doi:10.1049/el.2016.2587 Google Scholar

Dr. Xiao Yang

Dr. Zhenheng Liao

Dr. Xu-Chun Zhang