High-selectivity dual-band bandpass filter using asymmetric stepped-impedance resonators

Zhang, X.Y.; Chen, J.-X.; Shi, Jin; Xue, Quan

doi:10.1049/el:20091939

Cited by 39 publications

(31 citation statements)

References 8 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…In comparison with the previous works, the filter size and insertion loss are improved. The filter size reduction is equal to 80%, 86%, 23% and 80% in comparison with the structures of [1,2,3] and [4] respectively. The insertion loss improvement in the first band is 64%, 57%, 18% and 89% in comparison with the works of [1,2,3] and [4] respectively.…”

Section: Simulation and Measurementmentioning

confidence: 92%

See 1 more Smart Citation

Compact dual-band bandpass filter using open loop resonator loaded by in-line beeline for wideband applications

Hayati

Noori

2011

IEICE Electron. Express

View full text Add to dashboard Cite

Abstract:In this paper, a dual-band bandpass filter with low insertion loss in the pass bands and compact size is designed using only two open-loop microstrip resonators loaded by in-line beelines. The in-line beelines, are loaded to achieve two passbands with high performance. By adjusting the stub lengths and widths and also the tap line position, the harmonics above the second band are supperssed. The minimum insertion loss is 0.9 and 0.2 dB at the first and second passbands respectively. The minimum attenuation above the second passband is −19.5 dB from 5.4 up to more than 20 GHz, so it can be used for wideband applications. This filter is then fabricated and measured. The measured and simulated results are in good agreement. Keywords: dual-band filter, stepped impedance, stub, ultra wideband. Classification: Microwave and millimeter wave devices, circuits, and systems Lett., vol. 20, no. 4, pp. 196-198, Sept. 2010. [2] M. Jiang, L.-M. Chang, and A. Chin, "Design of Dual-Pass band Microstrip Bandpass," IEEE Microw. Wireless Compon. Lett., vol. 20, no. 4, pp. 199-201, April 2010. [3] X. Y. Zhang, J.-X. Chen, J. Shi, and Q. Xue, "High-selectivity dualband bandpass filter using asymmetric stepped-impedance resonators," References

show abstract

Section: Simulation and Measurementmentioning

confidence: 92%

“…In [2], due to utilization of the SIRs for the dualband bandpass filter, the circuit size of the filter has been increased. Open loop resonators are loaded by open stubs in [3], in order to synthesize a two-order dual-band bandpass filter. Large insertion loss and large implementation area are the main drawbacks of this structure.…”

Section: Introductionmentioning

confidence: 99%

Compact dual-band bandpass filter using open loop resonator loaded by in-line beeline for wideband applications

Hayati

Noori

2011

IEICE Electron. Express

View full text Add to dashboard Cite

show abstract

“…But it has large insertion loss while its large size problem is not solved. In [9] the asymmetric SIRs and open stubs are used to control the transmission zeros of a proposed dual band bandpass filter. Another problem of this filter is its small rejection-band between the two passbands.…”

mentioning

confidence: 99%

Design of a Microstrip Dual-Band Bandpass Filter with Compact Size and Tunable Resonance Frequencies for WLAN Applications

Salehi¹,

Abiri²,

Noori³

2014

IJCEE

View full text Add to dashboard Cite

In this filter an undesired return loss is seen, where the stopband between two passband is not enough wide. In [4] a dual band band pass filter with very large size and large insertion losses is offered to operate at 1GHz and 2GHz. In [5] the step impedance coupled lines, short circuited and open circuited stubs are used to design a dual band bandpass filter with asymmetric structure which has high insertion losses. In [6] using the step impedance resonators with very large sizes a high losses dual band bandpass filter is designed for ultra wideband applications. In [7] using the open loop resonators and half wave step impedance resonators a large insertion losses dual band bandpass filter is proposed. In [8] a large size step impedance resonator is used to design a dual band bandpass filter with four transmission zeroes. But it has large insertion loss while its large size problem is not solved. In [9] the asymmetric SIRs and open stubs are used to control the transmission zeros of a proposed dual band bandpass filter. Another problem of this filter is its small rejection-band between the two passbands. In [10] a compact dual band bandpass filter is designed by combining bandpass and band-stop filters to operate at 2GHz and 2.2GHz. In this structure low insertion losses are obtained in the both passbands. But the passbands have the small fractional bandwidths. In [11] a double-slot-loaded resonator is used for exploration of a dual band bandpass filter with two closely spaced passbands operated at 2.1GHz and 2.6GHz. In this structure a large insertion loss at second passband is obtained. In [12] a small fractional bandwidth dual band bandpass filter is designed and fabricated using open loop resonators for multimode WLANs. This filter has two undesired return loss in the both passbands.In this paper a compact microstrip filter is designed using two open loop resonators that connected together with mixed coupling. The loops are loaded by simple open stubs. Also in the proposed structure two new tapped lines feed structures are added at the input and output ports to improve impedance matching and achieve dual band bandpass response with good performance in terms of the low insertion losses and the wide fractional bandwidth. This paper is organized as follows: Section II describes design and structure, Section III introduces the simulation results, and Section IV presents the conclusion. II. DESIGN AND STRUCTUREThe open loop resonator loaded by three open end stubs is shown in Fig. 1. A novel step impedance taped line feed structure is connected to the open loop resonator to control the resonance frequencies. This taped line feed structure is added to achieve a good impedance matching too. The proposed resonator is divided to nine paths with different impedances and admittances. International Journal of Computer and Electrical Engineering, Vol. 6, No. 3, June 2014 248 DOI: 10.7763/IJCEE.2014.V6.832The resonance frequencies of the proposed resonator as shown in Fig. 1 can be controlled by adjusting its input im...

show abstract

“…There have been many innovative dualband bandpass filter designs [1][2][3][4][5][6][7][8][9][10][11][12][13][14][15][16]. The proposed filters are based on uniform impedance resonators UIR [1], split ring step impedance resonators SIR [2], cross-coupled structure on low temperature co-fired ceramic [3], SIRs in vertical-stacked parallel-coupled configuration [4], radial SIRs with variable impedance ratio [5], and meander-loop resonator [6,7].…”

mentioning

confidence: 99%

“…The proposed filters are based on uniform impedance resonators UIR [1], split ring step impedance resonators SIR [2], cross-coupled structure on low temperature co-fired ceramic [3], SIRs in vertical-stacked parallel-coupled configuration [4], radial SIRs with variable impedance ratio [5], and meander-loop resonator [6,7]. In other methods, dual-band bandpass filters are designed using folded SIRs [8], multilayer coupled structure [9], asymmetric SIR [10], half-wavelength SIRs [11,12], stub-loaded SIR [13], trisection SIRs [14], and coupled three-line resonators [15].…”

mentioning

confidence: 99%

Planar Microstrip Bandpass Filter With Wide Dual Bands Using Parallel-Coupled Lines and Stepped Impedance Resonators

Marimuthu

Abbosh²,

Henin³

2013

PIER C

View full text Add to dashboard Cite

Abstract-A dual-band bandpass filter with wide and highly attenuated stopbands is designed using parallel coupled microstrip line (PCML) and stepped-impedance-resonators (SIRs). The proposed filter is composed of a pair of highly coupled PCML-SIR structure and a central resonator using a low impedance rectangular microstrip. Initially, the wide dual-band performance is achieved by creating a transmission zero between those two bands using a tightly coupled PCML-SIR with a suitable impedance ratio. Then, a low impedance resonator is placed between the pair of PCML-SIR to generate multiple resonant frequencies for a broadband performance. The simulated and measured results of those filters agree very well. The bandwidth of the first band in the developed filters extends from 1.75 GHz to 3.75 GHz with less than 0.3 dB insertion loss at the center of the band. The second band has a bandwidth that extends from 6.95 GHz to 8.75 GHz with less than 0.5 dB insertion loss at the center of that band. The stopband separating those two passband has more than 30 dB attenuation with transmission zero at 5.85 GHz.

show abstract

High-selectivity dual-band bandpass filter using asymmetric stepped-impedance resonators

Cited by 39 publications

References 8 publications

Compact dual-band bandpass filter using open loop resonator loaded by in-line beeline for wideband applications

Compact dual-band bandpass filter using open loop resonator loaded by in-line beeline for wideband applications

Design of a Microstrip Dual-Band Bandpass Filter with Compact Size and Tunable Resonance Frequencies for WLAN Applications

Planar Microstrip Bandpass Filter With Wide Dual Bands Using Parallel-Coupled Lines and Stepped Impedance Resonators

Contact Info

Product

Resources

About