A Dual-Band Ring-Resonator Bandpass Filter Based on Two Pairs of Degenerate Modes

Liu, Sha; Li, Zhu; Sun, Sheng

doi:10.1109/tmtt.2010.2053590

Cited by 118 publications

(96 citation statements)

References 23 publications

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“…However, f o1 (f e1 ) is a degenerate mode. According to [4], the degenerate mode will split when a perturbation is used. Thus, the presented QMR exhibits quad-mode resonant characteristics when the two open-ended stubs are weakly coupled to each other as a perturbation.…”

Section: Analysis Of the Proposed Mmrsmentioning

confidence: 99%

“…As a result, various dual-band BPFs have been reported [1][2][3][4][5][6][7]. For example, stepped-impedance resonators (SIRs) are employed to design a dual-band BPF in [1].…”

Section: Introductionmentioning

confidence: 99%

“…However, the center frequencies cannot be independently controlled. By utilizing two pairs of degenerate modes of a single ring resonator, dual-band response is achieved in [4]. However, this solution needs indispensable perturbations and suffers from notch-like upper stopband.…”

Section: Introductionmentioning

confidence: 99%

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A Novel Compact Dual-Wideband Bandpass Filter With Multi-Mode Resonators

Li¹,

Huang²,

Wang³

et al. 2015

PIER Letters

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Abstract-A novel compact dual-wideband bandpass filter (BPF), with two multi-mode resonators (MMRs), a quad-mode one (QMR) and a triple-mode one (TMR), is proposed in this paper. The first passband is generated by a QMR loaded with a short-ended stub and two open-ended stubs, and the second one is realized by a TMR loaded with a square ring and a short-ended stub. Each passband can be tuned separately by controlling the corresponding resonator. The classical even-/odd-mode analysis is applied to characterize the presented MMRs due to their symmetric configurations. In order to validate the design methodology, a dual-wideband BPF prototype centered at 2.34 and 3.46 GHz with fractional bandwidths of 25.6% and 21.4% for WLAN and WiMAX applications is designed, fabricated and measured. Measurements have good agreement with simulations.

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Section: Analysis Of the Proposed Mmrsmentioning

confidence: 99%

“…As a result, various dual-band BPFs have been reported [1][2][3][4][5][6][7]. For example, stepped-impedance resonators (SIRs) are employed to design a dual-band BPF in [1].…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

A Novel Compact Dual-Wideband Bandpass Filter With Multi-Mode Resonators

Li¹,

Huang²,

Wang³

et al. 2015

PIER Letters

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show abstract

“…Currently, with the rapid development of modern wireless communications, bandpass filters with dual-band [1][2][3][4][5][6][7] and tri-band [8][9][10] even quad-band [11] operation become more and more important in communication systems for the multifunctional and miniaturization requirement of portable equipment. The traditional microstrip parallel-coupled halfwavelength resonator bandpass filters have narrow stopband between the fundamental response and the first spurious response, so the stepped-impedance resonator (SIR) [6][7][8] was presented in the past years not only to restrain the spurious responses, but also to shorten the resonator size.…”

Section: Introductionmentioning

confidence: 99%

“…SIR also can be used to design tri-band even multiband filters for tuning the higher order resonant modes conveniently. The deficiency of this kind of resonator is its resonant frequencies are dependent, and transmission zeros are difficult to implement, especially for the fundamental SIR Commonly, there are the following methods for dual-and multiband filter design: the first is using cascade resonators including the stepped impedance resonator [7,8,12], the second is using two sets of different resonators with two-path coupling [3], the third is using new resonator [2], and the fourth is using dual-mode [1,2] or multimode resonator. In this paper, split ring tri and quad-section SIR bandpass filters with dual-band operation are presented, and compared with dual-band filters with two sets of different resonators or two paths coupling, the new filter sizes are greatly reduced.…”

Section: Introductionmentioning

confidence: 99%

Compact Split Ring Sir Bandpass Filters With Dual and Tri-Band

Xiao

Zhu²

2012

PIER C

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Abstract-Multi-band microwave filters are important for multifunctional and miniaturization requirement of portable communication equipment. In this paper, tri-section split ring stepped-impedance resonator is analyzed, and new compact dual-band and tri-band bandpass filters are proposed by using split ring stepped-impedance resonators, and the designs are demonstrated by measurement. The new dualband filters operate at about 2.4 and 5.5 GHz which meet IEEE 802.11 application requirements, and the new tri-band filters operate at about 2.4-2.6, 3.3-3.6 and 5.2-5.6 GHz, and filter sizes are greatly reduced compared with relative reports. The designed filters have advantages of compact and miniature structures, low passband insertion losses and good frequency selectivity, all these have prospect to be applied in wireless communication systems.

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Advances in Planar Filters

Crnojević‐Bengin

Janković

2014

Wiley Encyclopedia of Electrical and Electronics Engineering

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Many microstrip filter configurations exist that exhibit advanced filtering characteristics, rely on new design techniques, or use original methods for filter miniaturization. For each filter type (lowpass, highpass, bandpass, and bandstop), we start with an overview of conventional planar filters, which are often used as a basis for the development of novel configurations, and then proceed to more advanced solutions. We classify the various advanced solutions found in the literature according to the underlying principle of design/operation: i) conventional filters using advanced geometries; ii) filters based on advanced theoretical concepts, such as the slow‐wave effect, defected ground structures (DGSs), electromagnetic‐bandgap (EBG) structures, or metamaterials (MTMs); and iii) filters based on advanced materials and technologies, such as superconducting, ferroelectric materials, and ferromagnetic materials. Finally, we present some of the advanced solutions not covered by the classification given above. We provide an overview of surface‐integrated waveguide (SIW) filters, followed by the discussion of various tunable and reconfigurable filter topologies. In the end, we present state‐of‐the art multiband filters.

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A Dual-Band Ring-Resonator Bandpass Filter Based on Two Pairs of Degenerate Modes

Cited by 118 publications

References 23 publications

A Novel Compact Dual-Wideband Bandpass Filter With Multi-Mode Resonators

A Novel Compact Dual-Wideband Bandpass Filter With Multi-Mode Resonators

Compact Split Ring Sir Bandpass Filters With Dual and Tri-Band

Advances in Planar Filters

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