A Novel Triple Passband Filter Design Method Based on Stepped Impedance Resonators

Li, Zhipeng; Wang, Shengjie; Su, Tao; Chen, Liang

doi:10.2528/pierc12090506

Cited by 7 publications

(7 citation statements)

References 19 publications

(22 reference statements)

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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%

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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%

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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show abstract

“…Therefore, multi-band bandpass filters (BPFs) have attracted much attention for supporting multiple communication applications in a single system, where different frequency bands satisfy the requirement of different standards. Up to now, various methods have been applied to design multi-band BPFs, which include combining several BPFs [1–4], stepped-impedance resonators (SIRs) [5–8], and stub-loaded resonators (SLRs) [9–11]. In [1], the tri-band BPF is composed of eight sets of resonators, and the center frequencies can be easily placed in the proper position.…”

Section: Introductionmentioning

confidence: 99%

“…Up to now, various methods have been applied to design multi-band BPFs, which include combining several BPFs [1–4], stepped-impedance resonators (SIRs) [5–8], and stub-loaded resonators (SLRs) [9–11]. In [1], the tri-band BPF is composed of eight sets of resonators, and the center frequencies can be easily placed in the proper position. In [7, 8], SIRs are employed to provide more freedom to control the harmonics, and a 0 ° feeding structure is presented to improve the passband selectivity.…”

Section: Introductionmentioning

confidence: 99%

A triple-wideband bandpass filter with controllable bandwidths based on stub-loaded resonators

Gong

Xiong

Zhang

et al. 2018

Int. J. Microw. Wireless Technol.

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In this paper, a triple-wideband bandpass filter (BPF) with controllable bandwidths based on two multi-mode stub-loaded resonators (MMSLRs) and a triple-mode resonator is presented. The MMSLR is loaded with two identical folded open-ended stubs and a T-shaped stub. Each passband of the tri-band BPF is formed by four resonant modes, which provide sufficient bandwidths to meet various application requirement. By adjusting the lengths of open-ended stubs, three passband bandwidths can be controlled individually. The center frequencies of the triple-wideband BPF are allocated at 2.7, 3.67, and 5.44 GHz, with the 3 dB fractional bandwidths (FBWs) of 20.1, 14.7, and 26.3%. Among the three passbands, the highest one covers the 5 G WiFi band (5.15–5.85 GHz). The measured results of the proposed filter exhibit excellent agreement with simulated results.

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“…Planar filters have been widely used, such as coupled filters [1,2] and stepped-impedance resonators with transmission zeros [3,4]. They are attractive because of the planar structure and low fabrication cost.…”

Section: Introductionmentioning

confidence: 99%

Compact Interdigital Capacitor Coupled Dual-Behavior Resonator (Icdbr) Filter With Suppression of Spurious Responses

Wang¹,

Su²,

Zhang³

et al. 2013

PIER C

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Abstract-A compact interdigital capacitor coupled dual-behavior resonator (DBR) filter with high spurious responses suppression is proposed in this paper. The technique is based on two equivalent topologies of J-inverter and dual-line equivalent circuit of opencircuited stubs. The first compact equivalent topology capacitive inverter is a high pass structure, and consequently, the spurious responses can be suppressed effectively at low frequencies. The second equivalent topology π-network is employed in realizing a compact size and adding new transmission zeros dedicated to the spurious responses suppression at high frequencies. Further compactness is achieved with a dual-line equivalent circuit of open-circuited stubs. The relevant equations are given in the paper. Finally, a 3rd-order compact DBR filter is designed and measured. This structure has a high degree of miniaturization (83%) in comparison to the classical one. Measurement results show good agreement with the simulated ones.

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A Novel Triple Passband Filter Design Method Based on Stepped Impedance Resonators

Cited by 7 publications

References 19 publications

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

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

A triple-wideband bandpass filter with controllable bandwidths based on stub-loaded resonators

Compact Interdigital Capacitor Coupled Dual-Behavior Resonator (Icdbr) Filter With Suppression of Spurious Responses

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