Balanced BPF With Dual-Port Quasi-Reflectionless Characteristic and Selectivity Enhancement

Wei, Feng; Xue, Yu-Chen; Zhao, Xi‐Bei; Liu, Wei-Shen; Xu, Le; Zhang, Peng Fei

doi:10.1109/tcsii.2022.3218154

Cited by 13 publications

(7 citation statements)

References 17 publications

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“…0.99 0 0 0 0 0 1 0.99 0 0.3 −0.66 0.36 0 0 2 0 0.3 0.94 0 0 0.3 0 3 0 −0.66 0 0.073 0 0.66 0 4 0 0.36 0 0 −0.9 0.36 0 5 0 0 0.3 0.66 0.36 0 0.99 0 0 0 0 0 0.99 0 (11) The design of the filter is similar as section II. Figure 5C,D shows a comparison between the simulated and measured results of the improved filter.…”

Section: Design Of the Filtermentioning

confidence: 99%

“…Such as stub-loaded bandstop filter (BSF) is loaded at the input port to achieve input reflectionless balanced wideband BPF 9 and stub-loaded BSFs are loaded at both input and output ports to achieve a dual-port reflectionless balanced BPF. 10,11 Out-of-band DM signal is absorbed and no DM signal is reflected in these designs. Nevertheless, the CM noise may be reflected back to the input port.…”

Section: Introductionmentioning

confidence: 99%

“…To solve this problem, reflectionless balanced BPF have been presented and investigated. Such as stub‐loaded band‐stop filter (BSF) is loaded at the input port to achieve input reflectionless balanced wideband BPF 9 and stub‐loaded BSFs are loaded at both input and output ports to achieve a dual‐port reflectionless balanced BPF 10,11 . Out‐of‐band DM signal is absorbed and no DM signal is reflected in these designs.…”

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

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: Design Of the Filtermentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

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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show abstract

“…In refs. [10][11][12][13][14][15][16][17][18], a complementary-duplexer architecture is utilized to implement single/dual-port absorptive single/dual-band BPFs and frequency-adaptive BPFs. The work in [19][20][21] proposes an absorptive lowpass filter prototype (ALPF) to realize ABPFs with a more concise structure.…”

Section: Introductionmentioning

confidence: 99%

“…Furthermore, one common disadvantage of these quasi-elliptic ABPFs [22][23][24][25][26] is that their circuit size is almost twice or more that of traditional reflective-type filters due to the adoption of multistage inverters [22,23], additional power dividers [24] and complex multilayered structures [25,26], which violates the miniaturization requirements of modern wireless communication systems. On the other hand, most of the distributed-element ABPFs mentioned above suffer from a restricted reflectionless range in practice, typically between 0.5 f 0 and 2.5 f 0 (f 0 : center frequency) [8,9,[12][13][14][15][16][17][18][19][20][21][22][23][24]26], caused by the limited bandwidth of the couplers/power-dividers or the dispersion of transmission-line inverters, which is also an important issue that needs to be addressed urgently.…”

Section: Introductionmentioning

confidence: 99%

Microstrip Quasi-Elliptic Absorptive Bandpass Filter with Ultra-Wide Reflectionless Range and Compact Size

Zhang,

Xu,

Liu

et al. 2024

Electronics

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Absorptive bandpass filters (ABPFs) are highly attractive in modern microwave communication systems due to their ability to internally absorb the harmful stopband RF-power reflections. This paper reports an approach to designing quasi-elliptic ABPFs with ultra-wide reflectionless range, enhanced selectivity, and compact size. The method is realized based on a fourth-order quasi-elliptic absorptive lowpass filter (ALPF) prototype with a simplified structure. This ALPF prototype exhibits both good impedance-matching over the whole normalized frequency domain and an adjustable transmission zero close to the passband. By applying an equivalent impedance transformer model, a coupled-line-based ABPF scheme is devised from the ALPF prototype, which eliminates conventional dispersive transmission line inverters, resulting in an ultra-wide reflectionless range and a compact size. Closed-form equations are derived to support the filter synthesis. A 2.45 GHz microstrip ABPF with 30% fractional bandwidth is designed for verification. The measured minimum in-band insertion loss is 0.83 dB and the reflectionless range of return loss better than 10 dB is from DC to 12.88 GHz. Both the upper and lower stopband suppression exceed 20 dB, with the upper stopband extending up to 6.80 GHz. The upper and lower out-of-band roll-off rates are 93.9 and 121.4 dB/GHz, respectively. The overall circuit size is 0.12 λg2.

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Signal‐interference‐based quasi‐reflectionless bandpass filter for wideband and high‐selectivity

Guo,

Qiu,

Deng

et al. 2024

Circuit Theory & Apps

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SummaryThis paper proposes a wideband quasi‐reflectionless bandpass filter with high‐selectivity based on signal‐interference method. The bandpass filter is composed of a bandpass section and two absorptive sections, which consist of a quarter‐wavelength coupled line and signal‐interfering/resistively loaded path, respectively. The bandpass section mainly performs bandpass filtering characteristics while the absorptive sections are applied to consume the reflected signals. By virtue of rationally setting electric lengths and characteristic impedances of the absorptive section to form signal interference, signal dissipation within a wider frequency range and higher selectivity can be realized. Finally, the quasi‐reflectionless bandpass filter was designed and demonstrated with well‐matched measurement and simulation results. Compared with conventional works, the proposed bandpass filter can simultaneously attain wideband, high‐selectivity, and two‐port quasi‐reflectionless performance within a single‐layer topology and well‐integrated structure owing to the signal‐interference technology. The proposed technique may be extensively applied in the RF front‐end and decreases the effect on the stability of communication systems caused by reflected signal.

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Balanced BPF With Dual-Port Quasi-Reflectionless Characteristic and Selectivity Enhancement

Cited by 13 publications

References 17 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

Microstrip Quasi-Elliptic Absorptive Bandpass Filter with Ultra-Wide Reflectionless Range and Compact Size

Signal‐interference‐based quasi‐reflectionless bandpass filter for wideband and high‐selectivity

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