Design of compact UWB bandpass filter with dual notched bands using novel SCRLH resonator

Liu, Bowen; Yin, Yingzeng; Sun, Anfeng; Fan, Shou‐Tao; Ren, Xueshi

doi:10.1002/mop.26832

Cited by 11 publications

(20 citation statements)

References 6 publications

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“…The skirt factor (SF) is used to evaluate the selectivity of the filter, which is defined as fraction of 3‐dB bandwidth to 30‐dB bandwidth of the passband . The SF of the proposed filter is 0.942, which is very good and much better than the notched‐band filters reported in . The simulation shows a notched‐band between 5.14 and 5.84 GHz, with a rejection level of 48.33 dB centered at 5.49 GHz, and 3‐dB FBW of 12.75%.…”

Section: Optimized Mmr Structure and Measurement Resultsmentioning

confidence: 93%

“…The slot allows the realizable gap between the coupling lines. From a practical point of view, another feature of this structure is the absence any short‐circuits, which is the case for stubs reported in . The proposed filter is simpler, and therefore, cheaper to fabricate.…”

Section: Optimized Mmr Structure and Measurement Resultsmentioning

confidence: 98%

“…Such systems require UWB bandpass filters (BPFs) to have a lower pass‐band insertion‐loss, high selectivity, higher out‐of‐band rejection, and flat group‐delay. Hence, the design of such filters is a nontrivial task, which presents a challenge for design engineers . Multimode resonators (MMRs) have been shown to present a viable solution of designing UWB BPFs, and various MMR configurations have been reported to date .…”

Section: Introductionmentioning

confidence: 99%

“…This necessitates the use of single or multiple notch‐band filters. Various methods and configurations have been reported that incorporate the notch‐band functionality within the UWB BPF to save space . In , notched‐band at 6.6 and 5.6 GHz, respectively, were realized using asymmetric coupling lines but the selectivity of these filters is poor and its performance fall short of the UWB frequency range.…”

Section: Introductionmentioning

confidence: 99%

“…In , the notched‐band is achieved around 5.5 GHz using short‐circuited stub which in practice introduces a level of complexity. Recent works in report UWB BPFs with single, dual, or triple notched‐bands. However, these filters suffer from poor selectivity.…”

Section: Introductionmentioning

confidence: 99%

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High selectivity UWB bandpass filter with a wide notched-band

Borhani

Honarvar

Virdee

2015

Microw. Opt. Technol. Lett.

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-This paper presents a compact ultra-wideband (UWB) bandpass filter with sharp selectivity, wide notched-band, wide out-of-band rejection, and approximately flat group delay. The proposed filter structure comprises of a U-shaped open-circuited line that is inter-digitally coupled to the input/output feed-lines using high impedance lines. The structure generates multiple resonant modes across the UWB span between 3.1 and 10.6 GHz, however high coupling between the feed-lines and the U-shaped structure transforms the discrete resonant modes into an UWB bandpass filter. Coupling is enhanced by inserting dielectric slots in the groundplane immediately under the coupling-lines. A wide notched-band is implemented by introducing asymmetry in the coupled lines. This was achieved by making one of the coupling lines longer by folding it and extending the line to partially couple with U-shaped structure. The length of the extended coupled line and the position of the folded section determine the center frequency of the notch-band and its 3-dB bandwidth. The notch was designed to be centered at 5.5 GHz with appropriate 3-dB bandwidth to blocking interference from WLAN signals. The selectivity of the filter was enhanced by loading the U-shaped structure with a T-shaped open-circuited stub to generate two additional resonant modes in the filter's passband and two transmission zeros that were strategically located at the upper and lower cut-off frequencies of the filter. The design was fabricated and its performance verified. The proposed filter has dimensions of 9.4 9.9 .Keywords: Ultra-wideband, bandpass filter, multiple-mode resonator, notched-band 9] notched-band at 5.6 GHz and 6.6 GHz, respectively, were realized by using asymmetric coupling lines but the selectivity of these filters is poor and its performance fall short of the UWB frequency range. In [10], quarter-wavelength spur lines were embedded in the resonator to create a notched-band centered at 5.69 GHz with a 3-dB notch bandwidth of 18%. In [11] a spiral slot is used to generate a notched-band around 5.5 GHz. A ring resonator with two stepped-impedance stubs is used in [12] to produce a notched band. Although this UWB filter had good selectivity performance however it is relatively large in size. In [15] a narrow slot embedded within the resonator is shown to produce a bandstop but its selectivity and size needs to be improved for practical applications. A radial stub loaded resonator in [16] is shown to produce a notched band at 8.0 GHz but its upper stopband falls short of the UWB frequency range. Lately, quadruple-mode notched-band UWB BPFs have been reported in [17][18] that have a wide upper stopband. In [18], the notched-band is achieved around 5.6 GHz using short-circuited stub which in practice introduces a level of complexity. Recent works in [19]-[21] report UWB BPFs with dual or triple notched-bands. However, these filters suffer from poor selectivity. Although extensive investigation has been conducted on UWB BPFs there is still a require...

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Section: Optimized Mmr Structure and Measurement Resultsmentioning

confidence: 93%

Section: Optimized Mmr Structure and Measurement Resultsmentioning

confidence: 98%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 3 more Smart Citations

High selectivity UWB bandpass filter with a wide notched-band

Borhani

Honarvar

Virdee

2015

Microw. Opt. Technol. Lett.

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A miniaturized low‐cost microstrip‐to‐coplanar waveguide transition‐based ultra‐wideband bandpass filter with multiple transmission zeros

Ghazali

Sazid

Pal

2020

Micro & Optical Tech Letters

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This article presents a dual notched ultra-wideband (UWB) bandpass filter (BPF) with good frequency characteristics realized on a low-cost dielectric. The proposed structure is based on the surface-to-surface transition technology, with microstrip lines aligned face-to-face on the top, and short-circuited butterfly shaped coplanar waveguide (CPW) in the ground. The microstrips and CPW are coupled vertically via the dielectric. The basic optimized alignment generates a third-order UWB filter with quasi-elliptic response having two transmission zeros at either passband edge and improved insertion/return loss. Later, folded split-ring resonators are coupled to feed lines of the basic BPF to develop multiple stopbands inside and outside the UWB spectrum. The predicted simulated performance is verified against measured data, which depicts good similarity. The structure covers an area of 21.2 × 16 mm 2 .

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