S. Sun and L. Zhu, "Miniaturized patch hybrid couplers using asymmetrically-loaded cross slots," IET Microwaves, Antennas & Propagation, vol. 4, no. 9, pp.1427-1433, Sep. 2010. [DOI:10.1049/iet-map.2009.0293]
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Pre One:S. Luo, L. Zhu, and S. Sun, "A dual-band ring-resonator bandpass filter based on two pairs of degenerate modes," IEEE Transactions on Microwave Theory and Techniques, vol.58, no.12, pp.3427-3432, Dec. 2010. [DOI:10.1109/TMTT.2010.2053590]
Next One:R. Li, S. Sun, and L. Zhu, "Direct synthesis of transmission line low-pass/high-pass filters with series stubs," IET Microwaves, Antennas & Propagation, vol. 3, no. 4, pp. 654-662, Jun. 2009. [DOI:10.1049/iet-map.2008.0259]