Wideband and compact filtering power divider based on vertically installed planar structures

Liu, Lei; Chen, Kun; Wang, Zhengbin; Zhang, Yerong

doi:10.1002/mmce.23251

Cited by 2 publications

(1 citation statement)

References 29 publications

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“…Furthermore, the transmission lines on horizontal substrate introduce extra equivalent capacitance, which has a significant influence on the even‐mode impedance while has little impact on the odd‐mode impedance [18, 19]. As depicted in Figure 7a, both of the even‐ and odd‐mode impedances decrease with the increasing of W 1 .…”

Section: Physical Implementation Using Vertically Installed Structuresmentioning

confidence: 99%

Wideband bandpass filters with suppressed harmonics using vertically installed planar structures

Liu

Chen²,

Wang

et al. 2023

IET Microwaves Antenna & Prop

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This article presents a closed-form synthesis method for wideband bandpass filters with suppressed harmonics, where stepped-impedance resonators (SIRs), scaled lines, and vertically installed planar (VIP) structures are introduced to improve the in-band and outof-band performances. By combining SIRs and scaled lines, the rejection level of the filter is greatly improved and a more compact size is achieved. And the VIP structures help to bring wide passband as well as suppressed harmonics. Then, a 3rd-order filter is designed to verify the validity of the proposed method and topology. The simulated and measured results demonstrate that the proposed design has a wide passband (FBW = 52.9%), low insertion loss (<0.4 dB), and suppressed harmonics with the level of 20 dB up to 7.1f 0 . K E Y W O R D S band-pass filters, filters | INTRODUCTIONBandpass filters (BPFs) are essential components in modern wireless communication systems. Over the past decades, BPFs with various in-band performances, such as wideband [1] and dual/multiple-band [2, 3] characteristics have been proposed and fully analysed. Meanwhile, the out-of-band characteristics of BPFs have equal importance in practical applications. As one of the classical methods, defected ground structure [4, 5] cells can easily achieve a wide stopband, while the signal integrity may be deteriorated for the incomplete ground plane. Then, hairpin structures [6], stepped-impedance resonators (SIRs), and coupled lines [7][8][9] were designed to expand the stopband. However, due to the circuit discontinuity, their design procedures became more complex.Recently, multiple novel techniques have been applied to improve the rejection level of BPFs, such as substrate-integrated defected ground structures [10,11], coaxial resonators [12], multilayer structures with slot lines [13,14], and transversal signal interactions [15]. Of these, multilayer structures require extra fabrication cost, which may be not preferred in industrial applications. Furthermore, the passband bandwidths of the most reported filters with suppressed harmonics are limited, and there are few reported works on wideband BPFs with Harmonic suppression. In ref. [16], a topology combining lumpedThis is an open access article under the terms of the Creative Commons Attribution-NonCommercial-NoDerivs License, which permits use and distribution in any medium, provided the original work is properly cited, the use is non-commercial and no modifications or adaptations are made.

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Section: Physical Implementation Using Vertically Installed Structuresmentioning

confidence: 99%

Wideband bandpass filters with suppressed harmonics using vertically installed planar structures

Liu

Chen²,

Wang

et al. 2023

IET Microwaves Antenna & Prop

Self Cite

View full text Add to dashboard Cite

show abstract

A wideband filtering power divider with improved out-of-band suppression

Sun,

Xu,

Chen

et al. 2024

IEICE Electron. Express

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A wideband filtering power divider (WFPD) with improved out-of-band suppression is proposed in this letter. The WFPD integrates open-circuit stub loaded multimode resonators (OSLMRs) and stepped impedance resonators (SIRs) to achieve good in-band filtering performance, and introduces six out-of-band transmission zeros (TZs) to improve out-ofband suppression. A 3GHz WFPD was designed, fabricated and measured. The measured results shows that the out-of-band suppression level of the designed WFPD is greater than 22.5dB on the left side of the passband and greater than 40dB on the right side.

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Wideband and compact filtering power divider based on vertically installed planar structures

Cited by 2 publications

References 29 publications

Wideband bandpass filters with suppressed harmonics using vertically installed planar structures

Wideband bandpass filters with suppressed harmonics using vertically installed planar structures

A wideband filtering power divider with improved out-of-band suppression

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