Novel microstrip dual‐band bandpass filter with wide stopband and high isolation

Guan, Xuehui; Fu, Wei; Li, Guohui; Jiang, Shan; Liu, Haiwen

doi:10.1002/mop.25881

Cited by 4 publications

(2 citation statements)

References 8 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Luo and Deng demonstrated that the size problem can be overcome by combining two sets of independent resonators with common input and output; however, such structures are very complicated. Currently, stepped‐impedance resonators (SIRs) and open‐loop resonators have been extensively investigated due to their attractive features, which could be applied to a dual‐band BPF with a simple structure, nevertheless the selectivity of some circuits remains to be improved. Furthermore, some researchers focus on realizing dual‐band filter with tunable passband ; however, the insertion loss and selectivity are not good and the tunable passband is only single passband.…”

Section: Introductionmentioning

confidence: 99%

Compact and High‐Selectivity Dual‐Band Bandpass Filter with Tunable Passband for Wimax and Wlan Applications

Wang

Kim

2013

Micro & Optical Tech Letters

View full text Add to dashboard Cite

A dual‐band bandpass filter with compact size and high‐selective performance is presented using the combination of an embedded double E‐type stepped‐impedance resonator and open‐loop resonators. The proposed dual‐band filter has the capability to achieve different passband frequencies, both resonance frequencies can be conveniently and independently controlled without enlarging outline circuit size, and four transmission zeros near the edges of the passband are achieved to obtain a high‐level selectivity. A comparison of simulated and measured results verifies the design and shows that two central frequencies of the fabricated filter are located at the desired 2.5 GHz (WiMax application) and 5.4 GHz (WLAN application) with 3 dB fractional bandwidths of 14.0 and 10.3%, respectively. The measured return losses are higher than 20 dB, whereas insertion losses are less than 0.9 dB in each of the two passbands. © 2013 Wiley Periodicals, Inc. Microwave Opt Technol Lett 55:2106–2110, 2013

show abstract

Section: Introductionmentioning

confidence: 99%

Compact and High‐Selectivity Dual‐Band Bandpass Filter with Tunable Passband for Wimax and Wlan Applications

Wang

Kim

2013

Micro & Optical Tech Letters

View full text Add to dashboard Cite

show abstract

“…In recent years, as an indispensable part of RF front ends, filters have gained a lot of attention due to the rapid development of modern communication systems, e.g., wireless local area networks (WLAN), global system for mobile communications (GSM), the third generation (3G), the fourth generation (4G), worldwide interoperability for microwave access (WiMax), etc. Due to the demands on working in multiband, the multiband bandpass filters, especially dual-band filters [1][2][3][4], become a hot research issue.…”

Section: Introductionmentioning

confidence: 99%

A Dual-Band Bandpass Filter With a Tunable Passband

Jia¹,

Feng²,

Huang³

et al. 2013

PIER C

View full text Add to dashboard Cite

In this paper, a novel dual-band bandpass filter with a tunable passband is proposed. Based on two quarter-wavelength resonators and one half-wavelength resonator, dual-band character is designed by introducing two independent coupling paths. The filter structure is designed and can be divided into two parts. The Transmission Zeros (TZs) are derived through simulation. By varying the reverse bias voltage applied to the varactor diodes which are connected to the resonators, the first passband can be independently tuned. The second passband can be easily controlled by the width of the half-resonator. Finally, simulation results show a first tunable passband with a constant fractional-bandwidth of 3.9 ± 0.3%, a center frequency of 1.472-1.886 GHz, and the second passband almost remains constant with a fractional-bandwidth 2.4% at frequency range 2.24 GHz. The measurement of the fabricated example shows good agreement with the simulation.

show abstract

Multiband bandpass filters with suppressed harmonics using a novel defected ground structure

Hejazi

Ali

2014

Micro & Optical Tech Letters

View full text Add to dashboard Cite

A novel defected ground structure, with a predominantly magnetic coupling, is designed, fabricated, and used to suppress the out‐of‐band harmonics of a class of multiband filter, characterized by very abrupt spurious response. A one‐pole lowpass filter is realized solely by making slots on the ground plane and keeping the original filter structure unchanged. The proposed structure has very minor effect on the performance of the original multiband filter, for example, on fractional bandwidths or level of S11. Measurements show the achieved suppression level of the filter spurious response to vary from 13 to 37 dB over a frequency range of about 1.5 GHz. Excellent agreements are observed between measurements and simulations within the filter bands. The filter size is maintained compact as the original. © 2014 Wiley Periodicals, Inc. Microwave Opt Technol Lett 56:2726–2731, 2014

show abstract

Novel microstrip dual‐band bandpass filter with wide stopband and high isolation

Cited by 4 publications

References 8 publications

Compact and High‐Selectivity Dual‐Band Bandpass Filter with Tunable Passband for Wimax and Wlan Applications

Compact and High‐Selectivity Dual‐Band Bandpass Filter with Tunable Passband for Wimax and Wlan Applications

A Dual-Band Bandpass Filter With a Tunable Passband

Multiband bandpass filters with suppressed harmonics using a novel defected ground structure

Contact Info

Product

Resources

About