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In this paper, a flexible microwave tag system using a frequency-scanning type RFID is proposed with multi-resonators based on defected ground structures. While a conventional chip-based tag stores time-sequential codes, the proposed one achieves pure passive tags by using multi-resonant bit over a wide frequency range. Moreover, the resonator of the spiral-shaped defected ground structure implemented...
Two bandpass filters (BPFs) for ultra-wideband (UWB) applications are proposed using the uniplanar compact- electromagnetic bandgap (UC-EBG) and the foliated UC-EBG (FUC-EBG) structures for size reduction. The sizes of the proposed UWB BPFs are reduced by 20 ~ 22% compared to the conventional one with the microstrip multiple-mode resonator (MMR). Both EBG structures are shown to cause a slow-wave...
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