Novel Balanced Coupled-Line Bandpass Filters With Common-Mode Noise Suppression

Wu, Chung-Hwa; Wang, Chi-Hsueh; Chen, Chun Hsiung

doi:10.1109/tmtt.2006.889147

Cited by 174 publications

(109 citation statements)

References 17 publications

(10 reference statements)

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“…In practical circuits, common-mode noise still interferes with differential signal path, which will degrade the signal integrity of a high speed circuit system [1][2][3][4][5][6][7][8]. The balanced bandpass filters (BPFs) are effective in removing the common-mode noises but still keep good signal integrity performance for the differential signals in their passbands [9][10][11][12][13][14][15][16].…”

Section: Introductionmentioning

confidence: 99%

“…Some balanced filters based on branch-line structures were presented in [9,14,15], which obtained good common-mode suppression in the passband and high selectivity for the differential mode but relatively high insertion loss. In addition, differential filters were constructed in [10,11] by taking advantage of the parallel-coupled lines which had some limitations for the special structures.…”

Section: Introductionmentioning

confidence: 99%

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Compact Balanced Uwb BPF Based on Hmsiw and D-DGS

Li¹,

Ding²,

Wei³

et al. 2015

PIER Letters

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Abstract-A compact balanced UWB bandpass filter (BPF) is proposed in this paper, which is based on the half-mode substrate integrated waveguide (HMSIW) and the differential defected ground structure (D-DGS). Using the HMSIW, the filter can achieve compact size, wide passband and good compatibility. Two D-DGS cells are employed to provide good suppression for the common-mode (CM) noise, while they have small effect on the performance of differential-mode (DM) signals. To validate the design theory, a microstrip balanced UWB BPF is designed, fabricated and measured to meet compact size, low insertion loss, good return loss as well as proper bandwidth. The predicted results are compared with measured data and show reasonable agreement.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Compact Balanced Uwb BPF Based on Hmsiw and D-DGS

Li¹,

Ding²,

Wei³

et al. 2015

PIER Letters

View full text Add to dashboard Cite

show abstract

“…Basically, those balanced circuits designed with careful DM operation concepts [1] have good immunity from CM noises, cancellation of even-harmonic signals, elimination of via holes and etc.. Therefore, RF/Microwave components, such as antennas [2,3], mixers [4][5][6], BPFs [7][8][9][10][11][12][13][14][15], and so on, are realized by their balanced counterparts. Among the conventional mobile devices, the SAW filters are usually employed in front-end modules with operation frequency not exceeding several gigahertzs (roughly around 3 GHz) because of their physical nature.…”

Section: Introductionmentioning

confidence: 99%

Stopband-Extended Balanced Filters Using Both Λ/4 and Λ/2 Sirs With Common-Mode Suppression and Improved Passband Selectivity

Lin¹,

Yeh²

2012

PIER

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Abstract-Benefitting from the simultaneous utilization of quarterwave (λ/4) and half-wave (λ/2) microstrip resonators, a via-free balanced bandpass filter (BPF) with direct-coupled scheme is presented in this study. In the beginning, a single-ended filter with transmission zeros (TZs) is newly proposed and the mechanism of creating two TZs around the passband without necessitating cross couplings is adopted. The TZs can be made structure-inherent based on the coexisted out-of-phase couplings among a coupled-resonator pair. On the foundation of the presented single-ended filter, a balanced filter featuring extended differential-mode (DM) stopband, good commonmode (CM) suppression, and improved passband selectivity has been designed and implemented. The DM stopband extension is achieved by misaligning the higher-order harmonic frequencies of each resonator in the DM bisected circuit while the CM suppression is accomplished by both harmonic misalignment and careful designed coupled structure in the CM bisected circuit. Eventually, a demonstrated balanced filter centering at 1.5 GHz possesses DM stopband extended up to 8f d 0 , where f d 0 denotes the DM operation frequency, and its CM rejection ratio (CMRR) within DM passband better than 51.9 dB is attained. For measurement convenience, the DM characterizations have been accomplished by 2-port network analyzer with simple rat-race baluns and are found relatively accurate within the −15 dB bandwidth of the utilized baluns.

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“…Most of these studies have used a microstrip line [11][12][13]. In [14], researchers used coupledline sections and quarter-wavelength (λ/4) resonators to design a full differential bandpass filter but its area still needs further reduction. A stepped-impedance resonator (SIR) is another proposed method for full differential bandpass filter design [15].…”

Section: Introductionmentioning

confidence: 99%

Very Compact Full Differential Bandpass Filter With Transformer Integrated Using Integrated Passive Device Technology

Wu¹,

Kuo²,

Chen³

2011

PIER

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Abstract-In this study, a very compact, second-order, full differential bandpass filter is presented. To achieve compact circuit area and system-in-package (SiP) applications, the transformer structure is integrated using integrated passive device (IPD) technology on a glass substrate. The coupled resonator synthesis method is used to achieve the bandpass filter design and suitably adjust the tapped feed-lines to obtain good impedance match at all ports. The area (1.27 mm×1.27 mm) of the bandpass filter is effectively reduced, and the performance, as measured by insertion loss (2.5 dB) and CMRR (> 30 dB), is still acceptable with such a compact area. Most importantly, this full differential bandpass filter is also suitable for SiP applications, as other studies implemented using glass IPD technology have demonstrated.

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Novel Balanced Coupled-Line Bandpass Filters With Common-Mode Noise Suppression

Cited by 174 publications

References 17 publications

Compact Balanced Uwb BPF Based on Hmsiw and D-DGS

Compact Balanced Uwb BPF Based on Hmsiw and D-DGS

Stopband-Extended Balanced Filters Using Both Λ/4 and Λ/2 Sirs With Common-Mode Suppression and Improved Passband Selectivity

Very Compact Full Differential Bandpass Filter With Transformer Integrated Using Integrated Passive Device Technology

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