A wideband high selectivity filtering balun

Hao, Zhang‐Cheng; Ding, Wenqi; Huo, Xin-Ping

doi:10.1002/mop.29030

Cited by 5 publications

(3 citation statements)

References 9 publications

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“…In addition, all the FMTs in [8][9][10][11][12][13][14][15] can only provide a fractional bandwidth (FBW) smaller than 8.62%, which is not appropriate for wideband applications. Moreover, using high-order resonators to meet wideband applications may lead to a large size [16]. A recent study in [17], reports an FMT based on hybrid SIW and coplanar waveguide (CPW) resonators to implement the compactness and 3rd-order filtering response, but its FBW is just 7.58%.…”

Section: Introductionmentioning

confidence: 99%

Design of Filtering Magic-T with Wideband and Wide Stopband Based on HMSIW and Spoof Surface Plasmon Polaritons

Líu

Xue

2022

Electronics

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A novel filtering magic-T (FMT) with a compact size, a broad bandwidth, and a wide stopband rejection based on the dielectric-covered L-shaped groove (DCLSG) half-mode substrate integrated waveguide and the spoof surface plasmon polariton (HMSIW-SSPP) structure is proposed for the first time. A HMSIW magic-T (HMT) based on dual-layer substrates is first designed. Then, we construct the proposed FMT by periodically etching the subwavelength DCLSG SSPP structure into the HMT. The proposed FMT achieves a bandpass filtering response and a nearly 50% reduction of longitudinal dimension attributed to the bandpass characteristics and strong slow-wave property of the DCLSG HMSIW-SSPP structure. In addition, beneficial from the regulable cut-off frequencies of the DCLSG HMSIW-SSPP structure, the proposed FMT provides a wide impedance bandwidth and independently adjustable lower and upper cut-off frequencies of the passband. Finally, a prototype of the proposed FMT is fabricated to validate this design idea. The measured results illustrate that the FMT has a 3-dB fractional bandwidth of 40.23% and a 20-dB stopband rejection up to 2.12 f0 (f0: center frequency of the passband).

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Section: Introductionmentioning

confidence: 99%

Design of Filtering Magic-T with Wideband and Wide Stopband Based on HMSIW and Spoof Surface Plasmon Polaritons

Líu

Xue

2022

Electronics

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“…In Refs. , coupled SIW cavity resonators are applied to realize band‐pass frequency response. This method is suitable to design band‐pass power divider with arbitrary center frequency and arbitrary bandwidth.…”

Section: Introductionmentioning

confidence: 99%

Compact power divider with improved isolation and bandpass response

You

Leng

et al. 2017

Micro & Optical Tech Letters

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This article presents a compact power divider with band‐pass response and improved isolation by using substrate integrated waveguide (SIW) and defected ground structure (DGS) techniques. The band‐pass response is realized by combining the high‐pass characteristic of SIW and low‐pass feature of DGS. In order to achieve improved isolation performance, a slot which is terminated by four resistors is etched on the top plane of the SIW to balance the three input/output ports. The size of the proposed power divider is relatively small because of the slow‐wave characteristic of DGS. To verify the proposed concept, a prototype power divider with equal power division is fabricated and measured. Measured results show that it has a 3‐dB pass‐band from 8 GHz to 10 GHz and the isolation is higher than 20 dB within the pass‐band.

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“…Furthermore, in each signal path, a dual-band filtering function is designed. An SIW is also used in [13], and the equalmagnitude and out-of-phase signal outputs are realized by oppositely using the top and bottom metal layers as the ground and signal strip line at two output ports. Furthermore, multiple slots are etched on the top and bottom layers to improve the isolation performance.…”

Section: Introductionmentioning

confidence: 99%

Design of a Microstrip Filtering Balun With a Wide Stopband

Yan¹,

Cao²,

Zhou³

2016

PIER C

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A microstrip filtering balun with a wide stopband is presented. Its filtering function is realized by four meandering stepped impedance resonators (SIRs). Except for an identical fundamentalmode resonant frequency, the SIRs have different high-order resonant frequencies. Thus, the parasitic passbands are suppressed, and a wide stopband is achieved. The unbalance-to-balance transition is accomplished by introducing two coupling output ports at two symmetry positions of the output SIR. The voltages at symmetrical positions have equal magnitudes and opposite phases, thus, signals coupled from the symmetrical positions also have equal magnitudes and opposite phases, i.e., balanced output signals are achieved. A more general design approach is discussed in detail, and the proposed approach is similar to the design method of the conventional filter except that a small modification is made. Additionally, two kinds of external coupling structures, microstrip coupling lines and tapped line, are compared in terms of stopband performance. The comparison shows that better stopband performance is observed when utilizing the microstrip coupling lines as the external coupling structure. A filtering balun with central frequency of 2.4 GHz and Chebyshev frequency response is designed, fabricated and measured. The measured results give a reasonable agreement with the simulated ones, which verifies the effectiveness of the filtering balun.

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A wideband high selectivity filtering balun

Cited by 5 publications

References 9 publications

Design of Filtering Magic-T with Wideband and Wide Stopband Based on HMSIW and Spoof Surface Plasmon Polaritons

Design of Filtering Magic-T with Wideband and Wide Stopband Based on HMSIW and Spoof Surface Plasmon Polaritons

Compact power divider with improved isolation and bandpass response

Design of a Microstrip Filtering Balun With a Wide Stopband

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