High-Order Dual-Port Quasi-Absorptive Microstrip Coupled-Line Bandpass Filters

Wu, Xiaohu; Li, Yingsong; Liu, Xiaoguang

doi:10.1109/tmtt.2019.2955692

Cited by 57 publications

(19 citation statements)

References 32 publications

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“…Figure 2A,B displays the configurations and simulated reflection coefficients of the absorption network and bandpass section. As shown in Figure 2B, the designed absorption network exhibits a transfer function that is nearly complementary with a BPF 19 . In this manner, the non‐transmitted signal in the DM stopband regions can be dissipated in these lossy stubs instead of being reflected back to the source.…”

Section: Analysis Of the Wide Stopband Reflectionless Balanced Bpfmentioning

confidence: 94%

“…As shown in Figure 2B, the designed absorption network exhibits a transfer function that is nearly complementary with a BPF. 19 In this manner, the non-transmitted signal in the DM stopband regions can be dissipated in these lossy stubs instead of being reflected back to the source. Hence, a quasi-reflectionless characteristics is obtained in the BPF.…”

Section: Dm Structure Analysis Of the Reflectionless Balanced Bpfmentioning

confidence: 99%

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Novel quasi‐reflectionless balanced bandpass filters using absorption network for common‐mode and harmonic suppression

Wang,

Guan,

Ren

et al. 2023

Micro & Optical Tech Letters

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Quasi‐reflectionless balanced bandpass filters (BPFs) using absorption network for common‐mode (CM) rejection and stopband extension are proposed and demonstrated. First, a quasi‐reflectionless balanced BPF is constructed by using absorption network and a uniform impedance resonator (UIR), where absorption network consists of lossy stubs loaded at both the input/output port and the ends of the coupling line (CLs). Owning to the resonating of absorption network, a three‐pole balanced BPF with CM and differential‐mode (DM) reflectionless performance are realized. Meanwhile, harmonic of DM is suppressed by exploring the loading position of the resistor. Second, to improve the selectivity of the filter, two open stubs are symmetrically loaded to the center of the UIR, a five‐pole quasi‐reflectionless balanced BPF with two transmission zeros are presented. Both proposed quasi‐reflectionless balanced BPFs are fabricated and measured. The measured results are in good agreement with the simulated ones, verifying the proposed design concept.

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Section: Analysis Of the Wide Stopband Reflectionless Balanced Bpfmentioning

confidence: 94%

Section: Dm Structure Analysis Of the Reflectionless Balanced Bpfmentioning

confidence: 99%

Novel quasi‐reflectionless balanced bandpass filters using absorption network for common‐mode and harmonic suppression

Wang,

Guan,

Ren

et al. 2023

Micro & Optical Tech Letters

View full text Add to dashboard Cite

show abstract

“…The fifth generation of mobile communication (5G) has driven the huge eagerness for filters with mall volume, high power capacity, and excellent performance. At present, the types of RF front-end filters are mainly divided into four categories, including microstrip filters in the communication market, 1 substrate integrated waveguide (SIW) filters, 2 surface acoustic wave (SAW) filters, 3,4 and bulk acoustic wave (BAW) filters. 5,6 However, electrical sizes of traditional microstrip and SIW filters are much larger than those of SAW and BAW filters, which are not conducive to the miniaturization, integration, and portability of 5G communication systems.…”

Section: Introductionmentioning

confidence: 99%

Mechanic–electric–circuit coupling analysis of BAW filter based on FDTD method

Chen,

Li,

Yin

et al. 2023

Micro & Optical Tech Letters

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In this paper, mechanic–electric–circuit coupling algorithm based on the finite‐difference time‐domain (FDTD) method is proposed to analyze a one‐order microwave bulk acoustic wave (BAW) filter. FDTD method is used to solve the coupled mechanic–electric–circuit system equations to obtain the voltage and current at port position of the BAW filter in the time domain. Then S parameters of the BAW filter in the frequency domain are calculated using the Fourier transform. In our work, a one‐order BAW filter consists of two film bulk acoustic resonators (FBARs) by means of series and parallel. These two FBARs in the BAW filter are coupled together through an equivalent electrical connection. Similarly, multiphysical mechanic–electric–circuit analysis of the BAW filter is implemented in the commercial software COMSOL, which is realized by the time‐domain finite element method. The accuracy of the proposed method is verified by comparison with simulation results in COMSOL. In addition, the computational time and memory of the proposed method have obvious advantages over those of COMSOL.

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“…The passive bandpass filter (BPF) is an essential component in a mobile communications system and commonly used in receivers and transmitters [1]. Important design characteristics of BPFs include their response, frequency selectivity, transmission zero, and cost [2]. A popular low-cost BPF design is a microstrip line for dual-band operation [1].…”

Section: Introductionmentioning

confidence: 99%

Miniaturized Dual-Band Bandpass Filter Using T-Shaped Line Based on Stepped Impedance Resonator with Meander Line and Folded Structure

2022

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A stepped impedance resonator (SIR) is suitable for designing a dual-band bandpass filter (BPF) that can be adjusted to reject spurious bands. A BPF is proposed using an SIR T-shaped meander line and folded structure. The BPF mainly comprises a meander line, a folded structure, and a T-shaped line. A novel BPF is used for the T-shaped line, which operates as a band-stop filter connecting to the center of the BPF. As a result, the complete BPF enables dual-band operation. The insertion and return losses of the first frequency passband (f01) are 0.024 and 17.3 dB, respectively, with a bandwidth of 46% at a center frequency of 2.801 GHz (2.2–3.48 GHz). The insertion and return losses of the second frequency passband (f02) are 0.026 and 17.2 dB, respectively, with a bandwidth of 10% at a center frequency of 4.351 GHz (4.13–4.55 GHz). The proposed BPF provides low loss, a simple structure, and a small size of only 4.29 × 4.08 mm, and it can be integrated into mobile communications systems.

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High-Order Dual-Port Quasi-Absorptive Microstrip Coupled-Line Bandpass Filters

Cited by 57 publications

References 32 publications

Novel quasi‐reflectionless balanced bandpass filters using absorption network for common‐mode and harmonic suppression

Novel quasi‐reflectionless balanced bandpass filters using absorption network for common‐mode and harmonic suppression

Mechanic–electric–circuit coupling analysis of BAW filter based on FDTD method

Miniaturized Dual-Band Bandpass Filter Using T-Shaped Line Based on Stepped Impedance Resonator with Meander Line and Folded Structure

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