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A compact bandpass filter (BPF) embedded with 5.8 GHz wireless‐LAN notch is presented for 3.1–10.6 GHz ultra‐wideband (UWB) systems. The proposed UWB‐BPF based on a defect‐grounded structure is implemented with an FR4 board. Two open‐loop resonators on the top layer provide a narrow notch band whose center frequency can be easily adjusted by varying the sizes of the open‐loop. A simple C‐shaped slot...
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