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Pre One:S. S. Gao and S. Sun, "A compact dual-mode balun bandpass filter with improved upper stopband performance," Electronics Letters, vol. 47, no. 23, pp. 1281-1283, Nov. 2011. [DOI:10.1049/el.2011.2879]
Next One:S. Sun and W. Menzel, "Novel dual-mode balun bandpass filters using single cross-slotted patch resonator," IEEE Microwave Wireless Component Letters, vol. 21, no. 8, pp. 298-300, Aug. 2011. [DOI:10.1109/LMWC.2011.2158535]