Synthesis and Design of LTCC Filtering Balun With Wide Stopband

Wu, Di‐Si; Li, Yuan Chun; Xue, Quan; Feng, Wenjie; Hu, Bin‐Jie

doi:10.1109/tcsii.2019.2940112

Cited by 17 publications

(10 citation statements)

References 9 publications

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“…In addition, the relationship between J 01 and J 12 can be found by applying (17) to (5). Hence, we can conclude that the presented filtering power divider has a first-order filtering response when ( 5) and ( 17) are satisfied.…”

Section: Synthesismentioning

confidence: 75%

“…To solve the drawbacks caused by the usage of additional bandpass filters, many microwave components having a filtering feature have been reported in [5]- [9], and studies on the design of filtering power dividers have been carried out extensively [10]- [19]. Filtering power divider has its own filtering functionality, thus there is no need of additional bandpass filters.…”

Section: Introductionmentioning

confidence: 99%

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Topology and Design Formulas for Four-Way Filtering Power Divider With Wide Isolation Range

Lee

2021

IEEE Access

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In this paper, we present a topology with design equations for the rigorous design of multiway power dividers having a pre-defined filtering response featuring broadband isolation between any pair of output ports. Hence, a filtering power divider designed using the presented topology and design formulas can suppress undesired oscillations at the spurious frequencies when used as a combiner. More importantly, we provide complete mathematical design equations for designing filtering power dividers with various predefined filtering responses. Therefore, it is possible to design a filtering power divider without relying on time-consuming parametric sweeps or heuristic approaches. The presented filtering power divider topology and design equations have been verified by designing, fabricating, and measuring a four-way second-order filtering power divider.

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Section: Synthesismentioning

confidence: 75%

Section: Introductionmentioning

confidence: 99%

Topology and Design Formulas for Four-Way Filtering Power Divider With Wide Isolation Range

Lee

2021

IEEE Access

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“…Especially, miniaturization and wide stopband filtering balun play an important role in highly integrated multimode wireless systems. For miniaturization, coupled‐line technology, 1 capacitive loading technology, 2,3 and multilayer process 4,5 are common methods, but these ways can only reduce the size to a limited extent or require complicated processes. For the wide stopband, the most obvious method is to integrate a low‐pass filter (LPF) in filtering balun, 6 but additional circuits result in an increase in balun size.…”

Section: Introductionmentioning

confidence: 99%

“…For the wide stopband, the most obvious method is to integrate a low-pass filter (LPF) in filtering balun, 6 but additional circuits result in an increase in balun size. In addition, stepped coupled lines, 7,8 distributed lines with capacitive loading, 2 and reducing finite high-order modes by input/output feedings 4 are good methods to broaden the stopband bandwidth. Unfortunately, stopband characteristics of the above four filtering baluns 2,[6][7][8] can only widen the limited stopband bandwidth for limited impedance ratio and limited outof-band suppression of LPF, and so forth.…”

Section: Introductionmentioning

confidence: 99%

Compact filtering balun with ultra‐wide stopband based on π‐type capacitive networks

Cheng

Zhang

2022

Micro & Optical Tech Letters

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In this letter, a new compact filtering balun with an ultra-wide stopband is proposed on the ceramic substrate. Four coupled line units are utilized to design the distributed balun with a second-order filtering response. Then, three-/twoport inductively loaded π-type capacitive networks without high-order harmonics are equivalent to distributed three-/two-port distributed coupled line units; therefore, the proposed compact lumped filtering balun based on these π-type capacitive networks inherently have ultra-wide stopband characteristics. To verify the design concept, a prototype with 15-dB bandwidth across 0.85-1 GHz is designed at 0.95 GHz, and its amplitude and phase imbalances are 0.4 dB and E4.5°, respectively. The upper stopband attenuation higher than 20 dB of the balun is extended to 12.9 f 0 , where f 0 is the center frequency, and its size is only 0.0025λ g 2 , where λ g is the guide wavelength.

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“…7 Unfortunately, the above-mentioned filtering baluns on PCB suffer from a relatively large circuit. For miniaturization, the processes of substrate integrated waveguide, 9 dielectric resonator cavity 10 and LTCC technology 11,12 have been utilized in the design of filtering balun. However, the design and fabrication of the multilayer structure are complicated and costly.…”

Section: Introductionmentioning

confidence: 99%

Compact filtering balun based on coupled‐line‐loaded hairpin ring resonators with extended stopband

Tian

Zuo

2022

Int J RF Mic Comp-Aid Eng

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A filtering balun with compact size and extended stopband is designed in this paper. This design is based on a novel coupled-line loaded hairpin ring resonator (C-HRR). First, the odd-and even-mode transmission characteristics of the C-HRR are carefully analyzed. Then, the miniaturization and large-frequencyratio features of the C-HRR are discussed and summarized. The out-of-phase current distribution at the odd-mode resonant frequency is noticed. Finally, to validate the features of the C-HRR, a filtering balun with wide upper stopband is designed, fabricated, and measured. Measured results show that the filtering balun can operate at 2.46 GHz with 0.5 dB magnitude imbalance and 4 phase imbalance. The circuit size of the filtering balun is only 0.24λ g Â 0.068λ g , where λ g is the guide wavelength at the center frequency f c . A wide stopband with 19.3 dB rejection from 1.05f c to 3.25f c is obtained. Both simulated and experimental results are in good agreement with each other.

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Synthesis and Design of LTCC Filtering Balun With Wide Stopband

Cited by 17 publications

References 9 publications

Topology and Design Formulas for Four-Way Filtering Power Divider With Wide Isolation Range

Topology and Design Formulas for Four-Way Filtering Power Divider With Wide Isolation Range

Compact filtering balun with ultra‐wide stopband based on π‐type capacitive networks

Compact filtering balun based on coupled‐line‐loaded hairpin ring resonators with extended stopband

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