Design of Triple-band Bandpass Filter Using Trn-section Stepped-Impedance Resonators

Lin, Xue; Chu, Qing Xin

doi:10.1109/icmmt.2007.381479

Cited by 45 publications

(34 citation statements)

References 7 publications

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“…These transmission zeros improve selectivity and cause suppression of the higher order modes. Table 3 summarizes comparisons of the proposed filter with other reported tri-band filters [7][8][9][10][11][12] and [13]. The proposed filter has the advantages of low insertion loss and compact size.…”

Section: Resultsmentioning

confidence: 99%

“…The dual-band filters were reported in [4][5][6] using SLR. Tri-band microstrip planar filters were also reported in [7][8][9][10][11][12][13]. However, RF filter is a basic and important component in the modern wireless communication system, and bandpass filter with the features of micro-package, good performance, low cost and ease of use has been the focus of device miniaturization.…”

Section: Introductionmentioning

confidence: 99%

“…The compact high performance microwave multi-band filters are highly desirable in wireless communication systems. The design of different multi-band filters was discussed by many authors [3][4][5][6][7][8][9], where they proposed multi-band filters, but the configurations still occupied a large circuit area and had complex designs, which are not suitable for wireless communication systems where the miniaturization is an important factor. Therefore, it is desirable to develop new types of dual-band microstrip resonators not only for offering alternative designs, but also for miniaturizing filters.…”

Section: Introductionmentioning

confidence: 99%

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A Very Compact Novel Multi-Band BPF for Recent Mobile/Satellite Communication Systems

Mohamed¹,

El-Shaarawy²,

Abdallah³

et al. 2014

PIER C

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Abstract-This paper presents a novel compact dual-tri bandpass microstrip filter employing meander and open stub loaded resonators. With the proposed technique, a simple transformation from dual-band to tri-band BPF is realized. A novel structure using embedded resonators is designed to generate multiband response. The main resonators control the low-band resonant frequency, the meander resonators control the two high-band resonant frequency and the open stub resonators control the high-band resonant frequency. The meander/stub resonators are embedded into the main spiral resonators, which makes the filter compact where its size is reduced by 64% compared to traditional filters. Passbands improvements and high selectivity are realized by the short circuit stubs which generate additional transmission zeros. The proposed filter has advantages such as low insertion loss, compact size and high selectivity. The theory is validated using the commercial full-wave solver CST 2012. Finally, the proposed structure is implemented and the measurement results are found to be in good agreement with the simulation results.

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Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

A Very Compact Novel Multi-Band BPF for Recent Mobile/Satellite Communication Systems

Mohamed¹,

El-Shaarawy²,

Abdallah³

et al. 2014

PIER C

View full text Add to dashboard Cite

show abstract

“…Also it is possible to achieve more compact dimensions using meandered connecting lines. As a shortcoming, the required impedance range of T-shape branch filters are wider than those in [17] and [20], but are still realizable with current PCB techniques.…”

Section: Tri-band Filters With Fully Controllable Passbandsmentioning

confidence: 99%

“…Next, some detailed comparison between this work and other techniques as presented in [3,17] and [20] are given. As can be seen in Table 3, T-shaped branch tri-band filters gives a greater range of bandwidths, and wideband bandwidths can be easily achieved compared with tri-section SIR techniques.…”

Section: Tri-band Filters With Fully Controllable Passbandsmentioning

confidence: 99%

A Tri-Band Bandpass Filter Realized Using Tri-Mode T-Shape Branches

Liu¹,

Dou²,

Zhao³

2010

PIER

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Abstract-In this paper, we present a tri-band filter design using tri-mode T-shaped branches connected by λ/4 transmission lines. By analyzing the input admittance of a T-shape branch with commensurate electrical lengths, three resonant modes with two transmission zeros between are found and design formulas are derived. The filter can be regarded as a combination of three bandpass filters with only one set of coupling elements. To realize different bandwidths for each, the admittance slope of each resonating mode is set as required. A genetic algorithm is used in solving related equations to obtain the impedance of each line in a T-shape branch, followed by a final optimization. A three-pole tri-band filter having passbands of 0.6-0.9, 1.35-1.65 and 2.1-2.4 GHz, is designed, fabricated and measured with low passband insertion losses of < 0.7 dB and high rejection of > 60 dB between the passband regions. As a generalization, necessary to achieve a tri-band filter with arbitrary passbands, a non-commensurate version of the T-shape branch is introduced. An example filter design Liu, Dou, and Zhao is given with the passbands asymmetrically located at 0.7-1, 1.65-1.95, and 2.2-2.3 GHz. This technique is able to achieve good design flexibility with respect to bandwidth ratios. This is validated by studying the maximum impedance variations of a T-shape branch when the bandwidth ratios vary.

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