A sharp-rejection dual-bandstop filter with multiple transmission poles and zeros based on transversal signal-interaction concepts

Cui, Liwei; Yu, Jianguo; Li, Shulan; Liu, Yuanan

doi:10.1109/emc-b.2017.8260353

Cited by 5 publications

(6 citation statements)

References 11 publications

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“…However, with the increase of the order, the size of the filter will also increase, which is not conducive to the design of the miniaturized filter. As a result, the method of adding the transmission zeros is usually used in the design of the miniaturized filter [16,17]. The zero point of the filter is the point where the transmission equation is equal to zero.…”

Section: Principle Of the Filtermentioning

confidence: 99%

An L-Band Bandpass Filter With Narrow Bandwidth and Miniature Based on LTCC Technology

Tan¹,

Yu²,

Xie³

2019

PIER M

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In this paper, in order to meet the requirements for miniaturizing a microwave frequency conversion module, an L-band filter with narrow band and high out-of-band rejection is designed based on LTCC technology. The values of each element in the simplified schematic diagram are used with Chebyshev type function being the prototype, and the shapes and layout of the elements are reasonably designed for effectively utilizing the electromagnetic coupling effect inside the structure. The actually processed filter has a bandwidth of 20 MHz, and its out-of-band rejection reaches 39 dB and 42 dB at 1 GHz and 1.6 GHz, respectively.

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Section: Principle Of the Filtermentioning

confidence: 99%

An L-Band Bandpass Filter With Narrow Bandwidth and Miniature Based on LTCC Technology

Tan¹,

Yu²,

Xie³

2019

PIER M

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“…More and more DBSFs have been proposed. [1][2][3][4][5][6][7][8][9][10][11][12][13][14][15][16][17][18] The filter proposed in Reference [1] adds a passband within the stopband to form a basic dual-band bandstop filter, but each stopband has only one transmission zero (TZ), and there are no extra transmission poles (TPs) next to the stopband to form sharp selectivity. And the 3-dB fractional bandwidths (FBWs) of the stopbands are very narrow.…”

Section: Introductionmentioning

confidence: 99%

“…They are very innovative, yet their 3-dB FBWs of the stopbands are too narrow as well. In order to improve the performance in all aspects, the filters proposed in References [14][15][16][17][18] show multiple TPs to form sharp selectivity and wide bandwidths of the stopbands, excellent passband, with deep stopband suppression. However, their structures are too complex in order to achieve dual-frequency, which is inconvenient for debugging and manufacturing.…”

Section: Introductionmentioning

confidence: 99%

“…The bandstop filter plays an important role in filtering noise and harmonics in front‐end RF devices, while the dual‐band bandstop filter (DBSF) can filter out more spurious signals more accurately with a smaller size. More and more DBSFs have been proposed 1‐18 1] adds a passband within the stopband to form a basic dual‐band bandstop filter, but each stopband has only one transmission zero (TZ), and there are no extra transmission poles (TPs) next to the stopband to form sharp selectivity.…”

Section: Introductionmentioning

confidence: 99%

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Broadband dual‐band bandstop filters based on step‐impedance stubs and transmission‐line networks

et al. 2022

Int J RF Mic Comp-Aid Eng

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In this paper, a novel basic structure of a dual-band bandstop filter (DBSF) without coupled lines is proposed. In order to improve the performance, some optimizations are made to the basic structure, and two DBSF structures with multi-transmission zeros and multi-transmission poles are obtained. These filters have the advantages of simple structure, high selectivity, and high stopband rejection, among which the deepest stopband can be better than 45 dB.In addition, an extraction method of transmission zeros and transmission poles based on the S-parameter theory is proposed. The ideal 3-dB fractional bandwidths of the basic structure are 37.8% and 18.7%, respectively, 54.1% and 25.9% for the first improved structure, respectively, and 75.1% and 34.2% for the second improved structure, respectively. EM simulation results and measured results are highly unified to verify the proposed filter structure.

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“…It is found that a transversal filter with high order could be decomposed into a group of sub-filters with the lower order, namely modules, and each module could be individually synthesised on different multi-mode resonators (MMRs). Compared to the above modular techniques and other reported transversal filters [9][10][11][12][13][14][15][16][17][18][19][20][21], the proposed modular technique reveals the following advantages in synthesising filters: i. Flexibility: For a high-order filter, arbitrary number and order of resonators could be grouped to individually form a module.…”

Section: Introductionmentioning

confidence: 99%

Modular implementation of transversal filter using transversal matrices and multi‐mode resonators

Guo

Wong³

2019

IET Microwaves, Antennas & Propagation

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This study, for the first time, presents an attractive property of transversal filters: modularity. That is, for a specified Nth‐order transversal filter, the N resonators could be divided into a number of modules and each module comprises arbitrary number and order of resonators, which could be implemented on a multi‐mode resonator. Thus, an Nth‐order filter could be synthesised by separately and independently synthesising different modules with lower orders, thus providing great flexibility, simplification and convenience in filter design. This property is realised by taking advantage of the independence between paths of transversal filters, which is guaranteed by the unique array of resonators of transversal filters. A class of transversal filter including bandpass filters and multi‐band filters are synthesised, fabricated, and measured. The synthesised results, along with the good measured results, verify the validity of the modularity property of transversal filters.

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A sharp-rejection dual-bandstop filter with multiple transmission poles and zeros based on transversal signal-interaction concepts

Cited by 5 publications

References 11 publications

An L-Band Bandpass Filter With Narrow Bandwidth and Miniature Based on LTCC Technology

An L-Band Bandpass Filter With Narrow Bandwidth and Miniature Based on LTCC Technology

Broadband dual‐band bandstop filters based on step‐impedance stubs and transmission‐line networks

Modular implementation of transversal filter using transversal matrices and multi‐mode resonators

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