Design of Novel Dual-Band Bandpass Filter with Multi-Spurious Suppression for WLAN Application

Mashhadi, Mostafa Rajabi; Komjani, Nader

doi:10.1080/09205071.2012.710351

Cited by 5 publications

(9 citation statements)

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“…But all of these dual‐passband filters discussed above suffer from unwanted higher order resonance frequencies, which limit bandwidth of the upper stopband. So far several techniques have been proposed to design a dual‐band bandpass filter with a wide upper stopband . In , the overcoupled structure is used to suppress the unwanted spurious resonance frequencies.…”

Section: Introductionmentioning

confidence: 99%

“…Each resonator is designed to have the identical two resonant frequencies at two passbands, but the higher‐order resonant frequencies of stepped‐impedance resonators (SIRs) are different. In , stub‐loaded SIR is proposed to design a dual‐passband filter with a wide upper stopband. Suppression of spurious frequencies in this filter is achieved using stub‐loaded section.…”

Section: Introductionmentioning

confidence: 99%

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Design of dual‐band bandpass filter with improved upper stopband using novel stepped‐impedance resonator

Mashhadi

Komjani

2014

Micro & Optical Tech Letters

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In this letter, a new dual‐band bandpass filter with multispurious suppression is proposed using novel stepped‐impedance resonators (SIRs). The proposed resonator is composed of a SIR with embedded bandstop structure. A third‐order filter is designed and fabricated that shows a rejection level of 30 dB up to 20 GHz (8.33f1). © 2014 Wiley Periodicals, Inc. Microwave Opt Technol Lett 56:603–606, 2014

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Design of dual‐band bandpass filter with improved upper stopband using novel stepped‐impedance resonator

Mashhadi

Komjani

2014

Micro & Optical Tech Letters

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“…The last method to achieve a dual-band performance is employing the resonators consisting of the open-or short-circuit stubs [15][16][17], which are placed in series or in parallel to create TZs in the middle passband of a wideband BPF. These circuits present high skirt selectivity, but they usually require a complex design procedure and have a larger circuit area due to the many series or shunt stubs.…”

Section: Introductionmentioning

confidence: 99%

A High Selectivity Dual-Band Bandpass Filter Using Dual-Mode and Triple-Mode Resonators

Huang¹,

Feng²,

Xiang³

et al. 2013

PIER C

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Abstract-In this paper, a novel high selectivity dual-band microwave bandpass filter (BPF) using dual-mode and triple-mode resonator is proposed. First, a dual-band filter comprising two dual-mode single band filters using common input/out lines is designed. Each single BPF is realized using a stepped-impedance resonator (SIR) with a centrally-loaded shunt open stub. The first and second passband can be independently controlled by the two dual-mode resonators, respectively. The proposed filter also offers three transmission zeros (TZs) to improve the selectivity. To further improve the selectivity over high side band of the first passband, a novel triple-mode resonator is designed to replace the dual-mode resonator. The basic structure of triple-mode resonator is microstrip-to-coplanar waveguide (CPW) structure. The microstrip structure provides one odd mode and one even mode resonant frequency and the CPW structure can provide another even mode resonant frequency without increasing circuit size. Both simulated and measured results show that the filters exhibit a good performance, including a small insertion loss, selectivity.

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“…Since then, efforts have been made to realize various kinds of filter configurations for the purpose of wideband and ultra-wideband uses [2][3][4][5][6][7]. In fact there is an issue of a possible electromagnetic interference over the allocated bandwidth of the UWB system, i.e., some narrow bands for other communication systems may exist in this band, such as wireless local area networks (WLANs) [8][9][10]. Therefore, the direct sequence ultra-wideband (DSUWB) specification for wireless personal area networks (WPANs) may be further divided into a lower band of 3.1-4.9 GHz and an upper band of 6.2-9.7 GHz [11].…”

Section: Introductionmentioning

confidence: 99%

Design Filters Using Tunable E-Shaped Dual-Mode Resonators for Lower-Ultra-Wideband and Upper-Ultra-Wideband Applications

Wu¹,

Liao

Xiong³

et al. 2013

PIER C

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Abstract-Two ultra-wideband (UWB) microstrip bandpass filters (BPFs) are proposed by using tunable E-shaped dual-mode microstrip Stepped-Impedance Resonator (SIR). For the lower band filter measurement results show there is a passband of 3.1 GHz to 5.2 GHz and its 3 dB fractional bandwidth is 51%. The UWB upper band filter may be obtained by tuning E-shaped SIR. The measurement results show there is a passband of 6 GHz to 10.6 GHz and its 3 dB fractional bandwidth is 55%. Compared with the similar investigation using the cascade of electromagnetic band gap (EBG)-embedded multiple-mode resonator (MMR) and fork resonator, the proposed approach has some advantages, such as easier adjustment of bandwidths, better passband performances and smaller size etc..

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Design of Novel Dual-Band Bandpass Filter with Multi-Spurious Suppression for WLAN Application

Cited by 5 publications

References 0 publications

Design of dual‐band bandpass filter with improved upper stopband using novel stepped‐impedance resonator

Design of dual‐band bandpass filter with improved upper stopband using novel stepped‐impedance resonator

A High Selectivity Dual-Band Bandpass Filter Using Dual-Mode and Triple-Mode Resonators

Design Filters Using Tunable E-Shaped Dual-Mode Resonators for Lower-Ultra-Wideband and Upper-Ultra-Wideband Applications

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