A Compact UWB Bandpass Filter with High Selectivity and Dual Notched-Band

سال انتشار: 1394
نوع سند: مقاله ژورنالی
زبان: انگلیسی
مشاهده: 279

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تاریخ نمایه سازی: 22 مهر 1398

چکیده مقاله:

A novel compact-sized ultra-wideband (UWB) bandpass filter (BPF) is proposed in this paper. The proposed BPF is highly selective and is able to eliminate WLAN signals from 5.15-5.35 GHz, and downlink of X-band satellite communication signals from 7.25-7.75 GHz. Generally, a multiple-mode resonator (MMR), comprised of a U-shaped line, with two high impedance stubs connected to it, and one stepped impedance resonator placed in the center of the U-shaped line is used to generate five resonate modes in the desired band (range of 3.1-10.6 GHz). Two transmission zeroes (TZs) are also placed to improve the bandage steepness. One of these TZs is with a lower cutoff frequency and the other TZ is with a higher cutoff frequency. A C-shaped open-circuited stub without adding any circuit size is parasitically coupled to the inner part of the U-shaped stub and can provide a narrow notched band at any desired frequency with appropriate bandwidth through the dimension of the parasitic element and its distance to the MMR. This C-shaped stub is used to reject WLAN signals. Furthermore, UWB passband is fully covered using asymmetric feed lines with defected interdigital coupled-lines. At the same time, another notched-band is implemented to reject X-band signals. Slots in the ground plane and input/output ports are etched to increase coupling and improve the in-band performance. The proposed BPF in the study covers UWB span completely and eliminate two bands of unwanted WLAN and X-band signals, with good linearity in the passband. A prototype filter was fabricated and its performance was measured to validate the simulation results. 


S.Jamal Borhani

Department of Electrical Engineering, Najafabad Branch, Islamic Azad University, Najafabad, Iran.

M.Amin Honarvar

Department of Electrical Engineering, Najafabad Branch, Islamic Azad University, Najafabad, Iran.

M.Reza Namazi-Rad

SMART Infrastructure Facility, University of Wollongong, Wollongong, NSW ۲۵۲۲, Australia