Tunable Dual-Band Filter and Diplexer Based on Folded Open Loop Ring Resonators

Feng, Wenjie; Zhang, Ying; Che, Wenquan

doi:10.1109/tcsii.2016.2634555

Cited by 84 publications

(52 citation statements)

References 13 publications

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“…To verify the correctness of the zero relations , a simulation of the ideal circuit with randomly selected parameters is carried out on software Ansoft Designer. Figure A shows the simulated results of the ideal circuit of Figure A, and three transmission zeros f z1 , f z2 , and f z3 are obtained (0.432, 1.305, and 1.727 GHz).…”

Section: Synthesis Design Of the Wideband Reconfigurable Filtermentioning

confidence: 99%

“…The research of reconfigurable filters can overall be concluded into center frequency tunability and BW tunability. The center frequency of the bandpass filter can be changed in the result of altering the valid electronic length of the resonator under the effect of tuning components . Apart from center bandwidth control of the bandpass filter also need to be considered.…”

Section: Introductionmentioning

confidence: 99%

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Wideband reconfigurable bandpass filter using coupled lines loaded with varactor loaded stubs

Shang

Feng

Che

2017

Int J RF Microw Comput Aided Eng

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In this article, a novel reconfigurable bandpass filter with tunable passband edge and bandwidth is proposed. The bandpass filter enables the two band edges independently adjustable to meet the needs of different systems. The wide tuning range of the bandwidth is achieved by controlling the tuning mechanism to altering not only the coupling strength of the coupled lines but also the transmission zeroes positions of the resonator. The lower passband edge can shifts from 760 to 840 MHz with the upper passband edge keeping still and the upper edge of the passbands from 981 to 1107 MHz with the lower edge keeping still. The overall tuning range of 3 dB fractional bandwidth is from 15.5% to 36%. The upper stopband attenuation of the fabricated structure can reach to 40 dB within a wide frequency range.

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Section: Synthesis Design Of the Wideband Reconfigurable Filtermentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Wideband reconfigurable bandpass filter using coupled lines loaded with varactor loaded stubs

Shang

Feng

Che

2017

Int J RF Microw Comput Aided Eng

Self Cite

View full text Add to dashboard Cite

show abstract

“…Dual-mode dual-band filters were introduced later that use different resonating modes of a resonator to realize dual bands. Meander loop resonator [2], stepped impedance resonator [3,4], and microstrip open loop resonator [5] are used as multi-mode resonators in this type of filters. Recently, metamaterial based composite right/left-handed (CRLH) transmission line has introduced a new method for designing and miniaturizing multiband microwave devices due to its unique phase response [6].…”

Section: Introductionmentioning

confidence: 99%

Compact Dual-Wideband Bandpass Filter Using CSRR Based Extended Right/Left-Handed Transmission Line

Fathi¹,

Atlasbaf²,

Forooraghi³

2018

PIER C

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Abstract-In this paper a miniaturized dual wideband bandpass filter is designed by the modified extended composite right/left-handed transmission line (ECRLH-TL) under balanced conditions in each right/left-hand passbands. A novel equivalent circuit is proposed to provide the design and an implementation of ECRLH unit-cell by means of the complementary, split ring resonator (CSRR) on the ground plane. Since CSRR is utilized as an alternative to implementing one of the resonators of ECRLH unit-cell, the size and complexity of the structure can be consequently reduced. An example of a dual band pass filter with 3 dB frequency bands from 3.2 to 4.8 GHz and from 6 to 7 GHz is investigated. There is a good agreement among circuit, electromagnetic simulations and measured results in both passbands. The measured insertion loss is better than 0.5 and 1 dB in first and second bands central frequency, respectively. The group delay which is an important factor in wideband communications is about 0.62 ns and 0.71 ns, respectively, in the first and second band central frequencies. The final dimensions of the miniaturized filter are reduced to 8.88 mm × 8.18 mm.

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“…To satisfy the systems with different frequencies regulations, a large number of tunable devices are proposed in wireless systems, such as tunable filters, tunable diplexers, and tunable antennas, etc. As an indispensable device in the communication systems, diplexer has attracted extensive attention to adapt to the requirements of communication system . By loading varactor diodes at middle and ends of common resonator, the work frequencies of diplexer can be tuned .…”

Section: Introductionmentioning

confidence: 99%

High isolation tunable diplexer based on mixed electromagnetic coupling

Guan

Huang

Ren

et al. 2017

Int J RF Microw Comput Aided Eng

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In this article, a tunable diplexer based on quarter‐wavelength resonators with mixed electromagnetic coupling is designed. Different coupling types are utilized to generate a transmission zero in the stopband of filter, aiming to improve the isolation of diplexer. The meander line tunable filter with a magnetic dominated coupling forms channel 1 of the diplexer, a transmission zero in upper stopband is realized. The tunable filter dominated by electrical coupling constitutes channel 2 of the diplexer, a transmission zero is produced in lower stopband of the filter. Varactor diodes are loaded at quarter‐wavelength resonators for tunability of the center frequency. The proposed diplexer is both demonstrated by simulation and measurement. Experimental results show that the designed tunable diplexer has a frequency range of 0.85‐1.2 GHz and an isolation of greater than 42 dB.

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Tunable Dual-Band Filter and Diplexer Based on Folded Open Loop Ring Resonators

Cited by 84 publications

References 13 publications

Wideband reconfigurable bandpass filter using coupled lines loaded with varactor loaded stubs

Wideband reconfigurable bandpass filter using coupled lines loaded with varactor loaded stubs

Compact Dual-Wideband Bandpass Filter Using CSRR Based Extended Right/Left-Handed Transmission Line

High isolation tunable diplexer based on mixed electromagnetic coupling

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