Dual-Band Microstrip Bandpass Filter Using Stepped-Impedance Resonators With New Coupling Schemes

Zhang, Yue Ping; Sun, Mengtao

doi:10.1109/tmtt.2006.882895

Cited by 210 publications

(95 citation statements)

References 8 publications

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“…The coupling scheme in [11] is used as the input/output of the proposed filter because it has more degrees of freedom in the design process. Four parameters, including d 0 , L 6 , L 7 , and W 4 shown in Figure 4, can be tuned to obtain different external quality factors.…”

Section: Feed Circuit and Resonator Couplingmentioning

confidence: 99%

High-Order Dual-Band Bandpass Filter With Independently Controllable Frequencies and Bandwidths

Chu

Li²

2012

PIER C

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Abstract-A multi-stub-loaded resonator is presented in this paper. The resonators can be conveniently applied to design high-order dual-band bandpass filters (BPFs). Base on the analysis of the resonator, the first two even-mode resonant frequencies are controlled independently by the lengths of the loaded stubs. Two high-order dual-band BPFs using the first two even-mode resonant frequencies of the multi-stub-loaded resonators are proposed. The bandwidth of each passband can be adjusted independently by the coupling strength of the adjacent resonators. This paper deals with the analysis and design of the proposed high-order dual-band BPFs as well as the experimental validations of the predicted dual-band performance.

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Section: Feed Circuit and Resonator Couplingmentioning

confidence: 99%

High-Order Dual-Band Bandpass Filter With Independently Controllable Frequencies and Bandwidths

Chu

Li²

2012

PIER C

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“…Dual-band filters operated at 2.4 GHz/5.2 GHz and 2.4 GHz/5.7 GHz are used in wireless local area network applications. In [2][3][4][5][6][7][8][9][10][11] dualband bandpass filters with large dimensions and large insertion losses have been presented. In [2] a dual-band bandpass filter has been designed to create two pass bands at 2.4 GHz/5.2 GHz, using λ/2 stepped-impedance resonators and distributed parallel-coupled microstrip lines, but the selectivity of this filter is not good.…”

Section: Introductionmentioning

confidence: 99%

“…In [2] a dual-band bandpass filter has been designed to create two pass bands at 2.4 GHz/5.2 GHz, using λ/2 stepped-impedance resonators and distributed parallel-coupled microstrip lines, but the selectivity of this filter is not good. In [3] a dual-band bandpass filter in low-temperature co-fired ceramic technology has been fabricated to create two pass bands at 2.4 GHz/5.2 GHz. However, it has an undesired isolation between two pass bands.…”

Section: Introductionmentioning

confidence: 99%

Tunable microstrip dual-band bandpass filter for WLAN applications

Rezaei¹,

Noori²

2017

Turk J Elec Eng & Comp Sci

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Abstract:In this paper, based on a new stub-loaded open loop resonator, a compact microstrip dual-band bandpass filter is presented. The proposed filter is designed using two stub-loaded open loop resonators to create two pass bands at 2.39 GHz and 5.7 GHz for multimode wireless LANs applications. Two high impedance sections are used in the main loops and the internal stubs are two low impedance microstrip cells. A method is presented to control the mode resonance frequencies. By increasing the internal stubs' dimensions, the resonance frequencies are adjusted without size increment. The proposed filter has a good performance. The insertion losses at 2.39 GHz and 5.7 GHz frequencies are 0.1 dB and 0.4 dB, respectively, while the return loss at the two pass bands is better than -16.6 dB. The filter size is 251 mm 2 . The designed filter is fabricated and measured. The results show that there is a good agreement between the simulation and measurement.

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“…In [6], a compact circuit size was obtained by the application of asymmetric SIRs and uniform impedance resonators. In [7], new coupling schemes were proposed to replace the normal counterparts to improve the performance of the filter. SIR filters obtain multiband frequency response by adjusting the ratio of impedance or electronic length, while it is difficult to realize without mutual interference.…”

Section: Introductionmentioning

confidence: 99%

Compact Multiband Transversal Bandpass Filters With Multiple Transmission Zeroes

Zhan¹,

Tang²,

Liu³

et al. 2012

PIER Letters

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Abstract-Novel compact multiband microstrip transversal bandpass filters (BPF) using short-circuited or open-circuited stub-loaded halfwavelength resonators (SLR) are presented. The dual-band BPF consists of two SLRs and two T-shaped feedlines, and the tri-band BPF can be implemented by a simple reconfiguration of adding one resonator above the original circuit of the dual-band BPF. Multiple transmission zeroes are created to improve the selectivity of the filters. Furthermore, the high degree of design freedom obtained for every passband of dual-or triple-band BPF is achieved by independent resonators and independent signal paths. To verify the proposed concept, two dual-band bandpass filters (filter I and II) and one triband bandpass filter (filter III) are designed and fabricated. Both theoretical and measured results are presented, with good agreements.

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Dual-Band Microstrip Bandpass Filter Using Stepped-Impedance Resonators With New Coupling Schemes

Cited by 210 publications

References 8 publications

High-Order Dual-Band Bandpass Filter With Independently Controllable Frequencies and Bandwidths

High-Order Dual-Band Bandpass Filter With Independently Controllable Frequencies and Bandwidths

Tunable microstrip dual-band bandpass filter for WLAN applications

Compact Multiband Transversal Bandpass Filters With Multiple Transmission Zeroes

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