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3. Compact elliptic-function low-pass filter using defected ground structure;Yang;IEEE Microwave Wireless Compon Lett
4. Compact elliptic-function low-pass filters using microstrip stepped-impedance hairpin resonators;Hsieh;IEEE Trans Microwave Theory Tech
5. Compact U-shaped dual planar EBG microstrip low-pass filter;Huang;IEEE Trans Microwave Theory Tech