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Progress In Electromagnetics Research
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COMPACT TRI-LAYER ULTRA-WIDEBAND BANDPASS FILTER WITH DUAL NOTCH BANDS

By P.-Y. Hsiao and R.-M. Weng

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Abstract:
A compact ultra-wideband (UWB) bandpass filter (BPF) with dual notch bands is presented using a tri-layer structure. In the design of UWB BPFs, it is desired to have a uniform 3.1 GHz to 10.6 GHz full-band transmission response. Dual notch bands are generated to filter out the interferences caused by signals transmitted from WLAN and/or WiMAX systems at 5.8 GHz and 3.5 GHz, respectively. The sharp rejection of WiMAX signals is achieved by adding meander open-loop resonators on the middle layer. Another rejection of WLAN signals is introduced by adding a C-shaped resonator on the bottom layer. The proposed filter is not only realized theoretically but also verified by a full-wave electromagnetic simulation. The designed tri-layer UWB BPF with dual notch bands was fabricated by two FR4 printed circuit boards with the permittivity of 4.4 and the thickness of 0.8 mm. The total area is 11 mm×10.5 mm.

Citation:
P.-Y. Hsiao and R.-M. Weng, "Compact tri-layer ultra-wideband bandpass filter with dual notch bands," Progress In Electromagnetics Research, Vol. 106, 49-60, 2010.
doi:10.2528/PIER10040204
http://www.jpier.org/PIER/pier.php?paper=10040204

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