Multilayer Planar Tunable Filter With Very Wide Tuning Bandwidth

Sun, Jim S.; Kaneda, Noriaki; Baeyens, Y.; Itoh, T.; Chen, Young-Kai

doi:10.1109/tmtt.2011.2163201

Cited by 48 publications

(25 citation statements)

References 18 publications

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“…The rejection levels at both the lower and upper stopbands are dB due to dissimilar resonators, better than tunable filters using conventional I/O structure for varactor-tuned splitring resonators [3], [8]. Note that the transmission zeros on the higher side of the passband improve the filter selectivity [11].…”

Section: Fabrication and Measurementmentioning

confidence: 99%

“…It consists of an asynchronously varactor-tuned combline resonator between the two synchronously varactor-tuned ring resonators. Traditional parallel coupled-lines are selected as the input/output (I/O) coupling structure to achieve impedance matching across a wide tuning range without any other tuning components [7], simpler than the matching circuit proposed in [4], [6], [8]. Fig.…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Three-Pole Tunable Filters With Constant Bandwidth Using Mixed Combline and Split-Ring Resonators

Zhao

Jiang²,

Yang³

et al. 2014

IEEE Microw. Wireless Compon. Lett.

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A novel three-pole tunable bandpass filter using mixed varactor-tuned combline and split-ring resonators is proposed in this letter. A tuning range of 1.1-1.88 GHz (70.9%) with an almost constant 3 dB absolute bandwidth of MHz (7.4%-4.4% fractional bandwidth) is demonstrated. The filter shows its insertion loss varying from 6.8 dB to 4.3 dB and return loss better than 13.5 dB within the tuning range. The rejection levels at both the lower and upper stopbands are dB. The measured results show good agreement with the simulated ones.Index Terms-Combline resonators, constant absolute bandwidth (CABW), split-ring resonators, three-pole tunable filters, varactor-tuned.

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Section: Fabrication and Measurementmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Three-Pole Tunable Filters With Constant Bandwidth Using Mixed Combline and Split-Ring Resonators

Zhao

Jiang²,

Yang³

et al. 2014

IEEE Microw. Wireless Compon. Lett.

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“…To achieve the requirement of the compact and low-cost RF module for the modern wireless communication system, the balun BPFs with the balance-to-unbalance conversion are highly desired. Accordingly, all kinds of tunable BPFs have been under intensive developments [5], but relatively only few researches have been done on the tunable balun BPFs [6].…”

Section: Introductionmentioning

confidence: 99%

Investigation of Compact Balun-Bandpass Filter Using Folded Open-Loop Ring Resonators and Microstrip Lines

Chen

Chang

et al. 2014

Mathematical Problems in Engineering

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A balun-bandpass filter was proposed by using two folded open-loop ring resonators (OLRRs) to couple three microstrip lines. By tuning the size of the OLRR, the operating frequency of the balun-bandpass filter could be tuned to the needed value. By tuning the size of open stub at the end of microstrip lines, the balanced impedance of the balun-bandpass filter could also be tuned. The fabricated balun-bandpass filter had a wide bandwidth and a low insertion loss at center frequency of the passband. The balunbandpass filter presented an excellent in-band balanced performance with common-mode rejection ratio more than 20 dB in the passbands. An advanced design methodology had been adopted based on EM simulation for making these designed parameters of OLRRs and microstrip lines. Good correlation was seen between simulation and measurement, and the result was that first run pass had been achieved in the majority of our designs.

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“…Recently, the stringent demand for low-cost reconfigurable communication systems such as cognitive radios requires the development of reconfigurable filters to cover a wide frequency range. In the past, tunable filters with single passband received much attention [11][12][13][14][15][16][17][18][19][20][21][22][23][24]. In [11,12], bandpass filters with tunable center frequency were demonstrated.…”

Section: Introductionmentioning

confidence: 99%

Independently-Tuned Dual-Band Filter Using Varactor-Loaded Resonators

Zhang¹,

Gao²,

Cao³

et al. 2013

PIER C

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This paper presents a high-selectivity dual-band bandpass filter with independently-tunable passband frequencies. A tap-coupled structure is utilized to feed the two resonators at lower passband and a coupling structure is used to feed the two resonators at the upper passband. Two pairs of varactor-loaded resonators operating within two different frequency ranges, allow the independent passband frequency tuning. Using this configuration, it is convenient to tune the center frequency of each passband, while the responses of the other passband remain unaltered. Source-load coupling is realized to generate transmission zeros, resulting in high skirt-selectivity. The transmission zeros move synchronously with the passbands, ensuring sharp roll-off rate for all tuning states. To verify the proposed idea, a demonstration microstrip tunable bandpass filter is implemented. The simulated and measured results are presented.

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Multilayer Planar Tunable Filter With Very Wide Tuning Bandwidth

Cited by 48 publications

References 18 publications

Three-Pole Tunable Filters With Constant Bandwidth Using Mixed Combline and Split-Ring Resonators

Three-Pole Tunable Filters With Constant Bandwidth Using Mixed Combline and Split-Ring Resonators

Investigation of Compact Balun-Bandpass Filter Using Folded Open-Loop Ring Resonators and Microstrip Lines

Independently-Tuned Dual-Band Filter Using Varactor-Loaded Resonators

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