Dual-Mode Dual-Band Bandpass Filter With High Cutoff Rejection by Using Asymmetrical Transmission Zeros Technique

Konpang, Jessada; Wattikornsirikul, Natchayathorn

doi:10.2528/pierm20102302

Cited by 6 publications

(6 citation statements)

References 10 publications

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“…Today, the resonators with the dual-mode property are widely used to achieve specifications of dual passband. [24][25][26][27] Figure 1 illustrates the primary layout of the proposed DB-BPF and the coupling structure based on three dual-mode resonators. As depicted in Figure 1A, the proposed DB-BPF consists of two folded asymmetric SIRs, a novel stub-loaded SIR, and the tapped lines as the input and output (I/O) feed lines.…”

Section: Filter Designmentioning

confidence: 99%

“…Recently, several dual-mode resonators have been developed based on transmission lines, including SIR, 28 ring resonator, 29 and stub-loaded resonator. 27,30 The basic SIR has a simple structure and is easily implemented. However, its flexibility to generate high-order resonant frequencies is limited.…”

Section: Resonators Characteristicsmentioning

confidence: 99%

“…Today, the resonators with the dual‐mode property are widely used to achieve specifications of dual passband 24–27 . Figure 1 illustrates the primary layout of the proposed DB‐BPF and the coupling structure based on three dual‐mode resonators.…”

Section: Filter Designmentioning

confidence: 99%

See 2 more Smart Citations

A new compact, wide bandwidth dual‐passband microstrip filter based on dual‐mode stepped‐impedance‐resonators

Moattari

Bijari

Razavi

2022

Int J RF Mic Comp-Aid Eng

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In this article, a new compact, wide bandwidth dual-band bandpass filter (DB-BPF) with four transmission zeros (TZs) is proposed. A dual-path configuration is realized by cascading different dual-mode resonators. The novel dualmode resonators are based on stepped impedance resonators (SIRs) that generate the TZs owing to their intrinsic characteristics. The proposed DB-BPF can fulfill simultaneous independent control of the external and internal-resonator coupling. The design procedure based on the cascaded dual-mode resonators and frequency transformation is also introduced. The surface current distributions are simulated to verify the performance of the proposed filter. The measured results show 2.14/4.33 GHz DB-BPF with 3-dB fractional bandwidth (FBW) of 0.27/0.15, respectively, which is suitable for WLAN applications. The return and insertion losses of the passband are better than 15/15-dB and less than 0.8/1.3-dB, respectively. The overall physical size of the fabricated DB-BPF is 20.4 mm Â 20.4 mm, equivalent to 0.23λ g Â 0.23λ g , where λ g is the guided wavelength at 2.14 GHz.The simulation results are in good agreement with the measurement results.

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Section: Filter Designmentioning

confidence: 99%

Section: Resonators Characteristicsmentioning

confidence: 99%

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A new compact, wide bandwidth dual‐passband microstrip filter based on dual‐mode stepped‐impedance‐resonators

Moattari

Bijari

Razavi

2022

Int J RF Mic Comp-Aid Eng

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“…Dual-band filters are often formed by combining two different filters with sharing common input and output coupled-feed lines [15,16]. Although these dual-band filters are more flexibly designed, they also suffer from large area and difficult debugging.…”

Section: Introductionmentioning

confidence: 99%

Bandpass Filter Design With Stub-Loaded Uniform Impedance Resonator and L-Shaped Feed Structure

Wang¹,

Yang²,

Jiang³

2022

PIER Letters

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Microstrip single-band and dual-band bandpass filters (BPFs) are presented in this paper. Firstly, a pair of open-ended stubs of less than λ/4 in length is connected to a uniform impedance resonator (UIR) at two symmetrical positions with respect to its centre, and at the same time other two open-circuited stubs with different lengths are loaded in the middle of the resonator. By virtue of parallel-coupling structure at I/O ports, a single-band BPF is constructed centered at 2.2 GHz with 10.6% 3-dB bandwidth, and two transmission zeros are implemented at the right side of the passband. Next, the L-shaped I/O coupled lines are applied to suppress the inherent spurious response of the stubloaded resonator. As a result, a dual-band BPF with two passbands at 2.2 GHz and 5.2 GHz, which is self-contained with three transmission zeros between the two passbands, is constituted. Finally, the proposed bandpass filters are designed and fabricated to provide an experimental validation for the predicted performances.

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“…In [1,2], the asymmetric transmission zero technique to develop dual pass band filter was described with excellent selectivity and good IL. But the overall size of the filter is an issue to discuss with.…”

Section: Introductionmentioning

confidence: 99%

Dual Pass Band Filter using Quad Stub Loaded Uniform Impedance Resonator

Neogi

Panda

2022

AEM

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A low loss, highly selective and miniaturized dual pass band filter for the wireless (WiMAX, WLAN) application is proposed in this paper. The filter is designed with Multimode resonators, constructed with Uniform Impedance Resonator (UIR) and multiple open stubs. Two different coupling schemes (electronic and magnetic) are observed for the said dual pass bands. A detail analysis about the dimension of the resonators, resonating conditions and frequency calculations are presented in this paper. The dual pass bands are achieved at 3.45 GHz and 5.4 GHz with minimum pass band insertion loss (|IL|) 0.1 and 0.18 dB and the pass band Fractional Band widths (FBW) 4% and 8% respectively. With proper optimizations, Transmission Zeros (TZ) are achieved on both sides of the dual pass bands and the spurious pass band are kept around -20dB level and hence good selectivity is achieved. The overall size of the filter is optimized for the best possible results in terms of Insertion Loss, Return Loss and selectivity, is found to be (24.2 x 21)mm = (0.28 x 0.24)λg = 0.06 λg2.

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Dual-Mode Dual-Band Bandpass Filter With High Cutoff Rejection by Using Asymmetrical Transmission Zeros Technique

Cited by 6 publications

References 10 publications

A new compact, wide bandwidth dual‐passband microstrip filter based on dual‐mode stepped‐impedance‐resonators

A new compact, wide bandwidth dual‐passband microstrip filter based on dual‐mode stepped‐impedance‐resonators

Bandpass Filter Design With Stub-Loaded Uniform Impedance Resonator and L-Shaped Feed Structure

Dual Pass Band Filter using Quad Stub Loaded Uniform Impedance Resonator

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