Bandpass filter based on asymmetric funnel shaped resonators with ultra wide upper stopband characteristics

Iqubal, Ami; Abdulla, Parosh Aziz

doi:10.1016/j.aeue.2020.153062

Cited by 9 publications

(10 citation statements)

References 15 publications

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“…Therefore, to avoid spurious out‐of‐band rejection of the filter, a loaded funnel‐shaped resonator is adopted. Such a resonator consists of a rectangular stub and tapering portion; it can achieve a good stopband because the linear tapering ensures that the transition from the high to low impedance line is gradual, improving reflection 14 . The geometry of the finally proposed wideband BPF in this article is depicted in Figure 4A.…”

Section: Analysis and Design Of The Wideband Bpfmentioning

confidence: 99%

“…Such a resonator consists of a rectangular stub and tapering portion; it can achieve a good stopband because the linear tapering ensures that the transition from the high to low impedance line is gradual, improving reflection. 14 The geometry of the finally proposed wideband BPF in this article is depicted in Figure 4A. It should be noted that the length of L 4 is different in Figures 3A and 4A DATA AVAILABILITY STATEMENT Data sharing is not applicable to this article as no new data were created or analyzed in this study.…”

Section: Orcidmentioning

confidence: 99%

“…The skirt factor is calculated as the ratio of 3 dB bandwidth to 30 dB bandwidth of the wideband BPF. In Iqubal & Iqubal, 14 a BPF using asymmetric funnel‐shaped resonators loaded with two high‐impedance stubs. Its center frequency was 5.68 GHz, with a fractional bandwidth of 97.57%.…”

Section: Introductionmentioning

confidence: 99%

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A wideband bandpass filter with wide upper stopband attenuation containing multiple resonators

Liu

Zhang

Zeng

2023

Micro & Optical Tech Letters

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A compact wideband bandpass filter with a wide passband and very‐wide out‐of‐band suppression is presented. The filter is constructed from a central rectangular‐ring resonator with two open stubs placed around it symmetrically. In addition, tri‐section stepped‐impedance resonators are symmetrically distributed on both sides of the two open stubs, and two symmetrical funnel‐shaped resonators are included to enhance out‐of‐band suppression. The out‐of‐band performance of filter is very good, with a suppression level greater than 20 dB up to 25.72 GHz. The center frequency of the filter is 5.84 GHz, with a fractional bandwidth of 115.8%. Good agreement between the simulations and measurements validates the design principle.

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Section: Analysis and Design Of The Wideband Bpfmentioning

confidence: 99%

Section: Orcidmentioning

confidence: 99%

See 1 more Smart Citation

A wideband bandpass filter with wide upper stopband attenuation containing multiple resonators

Liu

Zhang

Zeng

2023

Micro & Optical Tech Letters

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“…A bandpass filter (BPF) is an integral part of the front end to regulate FCC mask emission. In literature, three different design methodologies were reported, including the cascade approach, multi-mode resonator (MMR) approach, and MMR with defected ground structure (DGS)-based UWB BPF to retain passband characteristics [2][3][4][5][6][7][8][9][10][11][12][13][14][15][16][17][20][21][22][23]. Conventional cascading of lowpass and highpass filters was adopted to the construct UWB BPF, which yielded good selectivity, but it exhibited a larger electrical size [2][3][4].…”

Section: Introductionmentioning

confidence: 99%

A miniaturized UWB bandpass filter with tunable cut-off frequencies employing rectangular open-loop defected ground structure

Verma

Sahu

Gupta

2023

Int. J. Microw. Wireless Technol.

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This article presents a compact rectangular impedance resonator (RIR)–based ultra-wideband bandpass filter with an improved reflection coefficient within the passband and controllable cut-off frequencies. The proposed filter consists of anti-parallel coupled RIR coupled with rectangular open-loop defected ground structure (ROL-DGS) etched on the ground plane. The ROL-DGS ensures better in-band and out-off-band characteristics with reduced size due to its high Q-factor. The short- and open-circuit stubs control the lower (fCL) and upper (fCU) 3-dB cut-off frequencies, respectively, by originating transmission zeros independently with the help of variations in design parameters. As a result, the filter having a compact size of 0.216λCL × 0.176λCL is achieved, where λCL is the corresponding guided wavelength at the lower cut-off frequency fCL of 2.95 GHz. Further, an equivalent circuit is also modeled to explain the working of the proposed filter, and equivalent lumped parameters were extracted. Simulated results reveal that the reported filter passes the frequencies effectively within 2.95–11.44 GHz with fractional bandwidth of 117.9%. The simulated insertion loss values within the passband are less than 1.17 dB, and the reflection coefficient is better than −19.6 dB. Further, the proposed filter is fabricated, and it was found that the measured and simulation results are in well agreement.

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“…The design of filters depicted in [12][13][14][15][16][17][18] involves complex methods which require sophisticated procedures for achieving the narrow spacing between adjacent lines. For improving the selectivity of the structure, various methods are discussed in [19][20][21][22][23][24][25]. Techniques for improving the stopband suppression are analyzed in [26,27].…”

Section: Introductionmentioning

confidence: 99%

Staired-Slitted Flag Central Resonator Based Wide Band Bandpass Filter for Super Spurious Harmonic Suppressions

Iqubal¹,

Abdulla²

2021

PIER C

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A novel staired-slitted flag central resonator based wide band bandpass filter with sharp selectivity and super spurious harmonic suppression is proposed in this paper. Input-output ports based on three line edge coupling with ground plane aperture cutting contribute to the rejection of harmonics in the lower stopband. The spurious harmonic at the upper stopband is rejected with the help of embedded open stub suppression cells. The generation of two transmission zeros at the lower and upper cut-off frequencies are due to the staired slitted-flag main resonator, which contributes to the better selectivity of the filter, and it is verified with the help of mathematical equations. The fractional bandwidth of the developed filter is 107.2% with 7.82 GHz centre frequency. This work demonstrates the design, theory, and implementation aspects for the realization of bandpass filters with sharp selectivity and very good spurious suppression.

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Bandpass filter based on asymmetric funnel shaped resonators with ultra wide upper stopband characteristics

Cited by 9 publications

References 15 publications

A wideband bandpass filter with wide upper stopband attenuation containing multiple resonators

A wideband bandpass filter with wide upper stopband attenuation containing multiple resonators

A miniaturized UWB bandpass filter with tunable cut-off frequencies employing rectangular open-loop defected ground structure

Staired-Slitted Flag Central Resonator Based Wide Band Bandpass Filter for Super Spurious Harmonic Suppressions

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