Compact quintuple notched-band UWB BPF with high selectivity and wide bandwidth

Abstract

In this paper, a compact quintuple notched-band ultra-wideband bandpass filter with high selectivity and wide bandwidth is proposed. The filter adopts an approximate closed-loop C-shaped stepped impedance resonator to generate triple notched bands, and uses Hilbert fractal curve slit and L-shaped resonator to create single notched band, respectively. Multiple notched-band are centered at 5.29, 6.61, 7.92, 8.95, and 9.93 GHz to eliminate undesired interference from coexisting wireless services of WLAN, C-band, and X-band. Additionally, two transmission zeros are introduced to enhance the sharp skirt selectivity up to 0.944. This filter could exhibit high sharp selectivity and wider bandwidth simultaneously. The filter is fabricated on a RT/Duroid 5880 substrate (ɛ r = 2.2 and thickness = 0.787 mm) and measured to verify the simulation results. Both simulation and measurement are in well agreement, showing the good performance of the filter.

Design of double-notch UWB filter with upper stopband characteristics based on ACPW-DGS

“…It not only has a wider bandwidth, but also has a high data rate within a short-distance transmission range [3], which can satisfy a large number of users to surf the Internet at the same time.The filter is an important part of the radio frequency (RF) transmission system, the combination of UWB and filter design has become a current research hotspot. The design of UWB filters mainly includes the following methods [4][5][6][7][8][9][10][11][12][13]: high-pass/low-pass cascade [5], loading short-circuit stub [6][7][8], multi-mode resonator method [9,10], hybrid microstrip/CPW method [11][12][13] and so on. The CPW design perfectly meets the requirements of miniaturization of microwave RF devices under the background of 5G wireless communication.…”

Miniaturized Bandpass Filter Using a Combination of T–Shaped Folded SIR Short Loaded Stubs

“…There have been numerous studies to reduce the size of stub BPFs while ensuring a wide bandwidth [ 12 , 13 , 14 ]. The authors of [ 12 ] used the zeroth–order resonance (ZOR) method producing a 11.9 mm × 6.0 mm BPF with a bandwidth of 119%.…”

“…However, this BPF used a coupling structure for the feeding line, which generated coupling losses. The BPF proposed in [ 13 ] was 19.88 mm × 22.62 mm in size and had a bandwidth of 116%; the BPF used a coupling structure for its in/output part and employed the DGS (defected ground structure) technique. The disadvantages of this BPF, in addition to being quite bulky, were the coupling losses it generated and the parasitic phenomenon between the transmission line and ground that occurred.…”

“…Studies [ 15 , 16 , 17 ] described BPFs that were 32 mm × 10 mm, 13.0 mm × 10.0 mm, and 150 mm × 150 mm, respectively, in size and had wide bandwidths (123% [ 15 , 16 ] and 146% [ 17 ]). However, these devices also had high insertion losses (0.8 dB [ 13 ], 0.3 dB [ 14 ], and 0.55 dB [ 17 ]).…”

Investigation on the chipless RFID tag with a UWB pulse using a UWB IR-based reader

“…Ultra-wideband (UWB) wireless communication technologies have been drawing considerable attention amongst researchers due to the advantages such as small size, high data rate, low power consumption, low structural complexity, and low fabrication cost. Different types of structures have been investigated, such as dipole antennas [36] and monopole antennas [37][38][39][40][41][42][43][44][45][46].…”