A compact tri-band microstrip filter with independently tunable passbands and high selectivity

Zhang, Fan; Gao, Yang; Wang, Yi; Zhang, Yi; Xu, Jun

doi:10.1587/elex.16.20190589

Cited by 3 publications

(3 citation statements)

References 16 publications

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“…As an essential component of multi-band wireless communication systems, frequency reconfigurable bandpass filters (BPFs) need low insertion loss, outstanding frequency selective characteristics, small area, and feasibility [2]. Many research efforts in the past decade have been done to meet the above needs [1,2,3,4,5,6,7,8,9,10,11,12,13,14,15,16,17,18,19,20,21,22,23,24,25,26,27,28,29]. The design techniques for these frequency reconfigurable BPFs include the utilization of tunable BPFs [3,4,5,6,7,9,11,12,13,17,18,19,20].…”

Section: Introductionmentioning

confidence: 99%

“…Many research efforts in the past decade have been done to meet the above needs [1,2,3,4,5,6,7,8,9,10,11,12,13,14,15,16,17,18,19,20,21,22,23,24,25,26,27,28,29]. The design techniques for these frequency reconfigurable BPFs include the utilization of tunable BPFs [3,4,5,6,7,9,11,12,13,17,18,19,20]. They have minimal components and continuously tuned ability but suffer from high nonlinearity due to nonlinear components usage, including varactor diode.…”

Section: Introductionmentioning

confidence: 99%

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Switched integrated band-pass filter bank utilizing 0.25-um pHMET GaAs process for S-, C-, and X-band applications

Wu,

Wang,

et al. 2024

IEICE Electron. Express

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This letter presents a fully monolithic microwave integrated circuit (MMIC) switched filter banks (SFBs) that feature a digitally selectable operation bandwidth frequency. The integrated SFBs with four independently controlled channels span the 2 GHz to 12 GHz frequency range. Unlike the existing methods, the proposed SFB consists of a pair of single-pole four-throw (SP4T) switches coupled with four band-pass filters (BPFs), and the TTL signal can directly drive the SFB through an inner integrated FET-driven circuit, achieving facility usage in the RF system. For verification, two wideband SFB MMICs were designed and fabricated using a 0.25-µm gallium arsenide (GaAs) based InGaAs pHEMT Enhancement/Depletion-Mode Device (E/D-Mode) process, named the low-band SFB and high-band SFB. Measurement results show that the minimum insertion losses for the four channels of the proposed low-band MMIC SFB are around 4.6 to 6.3 dB. The measured Rectangle factor 𝑆𝐹 30𝑑𝐵 for the four channels are all below 1.87. The measured minimum insertion losses are around 4.9 to 6.1 dB for the high-band SFB. The measured Rectangle factor 𝑆𝐹 30𝑑𝐵 for the four channels are still bellow 2.15. The proposed SFB MMIC shows remarkable selectivity and high integration.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Switched integrated band-pass filter bank utilizing 0.25-um pHMET GaAs process for S-, C-, and X-band applications

Wu,

Wang,

et al. 2024

IEICE Electron. Express

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“…In Kingsly et al [7], through the combination of pin diodes, the filter can work in a series of two-band or three-band states, but it can only provide discrete center frequencies and cannot achieve continuous tuning. Compact tri-band filter with three tunable passbands is proposed in [8]. However, due to its coupling structure, it has a larger mechanical size and does not meet the requirements of miniaturization.…”

Section: Introductionmentioning

confidence: 99%

A novel reconfigurable tri-mode resonator and its application to bandpass filter

2022

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A reconfigurable tri-mode resonator and its application to tri-band bandpass filter have been demonstrated. The proposed filter exhibits 32.8% fractional tuning range of the first passband from 1.12-1.56 GHz and 12.73% of the third pass-band from 2.50-2.84 GHz, and a fixed second passband at 2 GHz, respectively. The first and third frequency passbands can be tuned independently without interfering with each other. Especially, the filter uses a hybrid technique of lumped inductors and microstrip lines, resulting in a very compact mechanical size of 0.12 ?g ? 0.08 ?g, where ?g is the guided wavelength on the substrate at the central of the first passband frequency. The measured results agree well with the simulated ones.

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A highly selective tri‐band bandpass‐to‐bandstop filter with the third band independently tunable

Yang

Zhang

et al. 2021

Engineering Reports

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A highly selective tri-band bandpass (BP)-to-bandstop (BS) filter with the third tunable band and the other two fixed ones is proposed in this article. This filter is based on a novel crossed resonator that is composed of a two-end-open UIR with an open stub and a short stub connected in parallel on both sides of the resonator center. A PIN diode is utilized to achieve BP-to-BS switchable characteristics. Then, varactor diodes loaded at the open stub are employed to obtain the independently tunable third band. In addition, due to the symmetry of the resonator structure, the even-and odd-mode analysis method is used to derive the resonant frequencies. For validation, a tri-band BP-to-BS filter operating at 2.4 GHz (WLAN), 3.3 GHz (WiMAX), and 4.9 GHz (LAA/LTE-U) is designed, manufactured, and measured that achieves the continuous frequency tuning range (FTR) of the third band from 4.52 to 4.90 GHz with return loss (RL) better than 10.05 dB under the BP characteristic, from 4.55 to 4.90 GHz with the rejection level (RL) higher than 15.53 dB under the BS characteristic. The measured results agree well with the simulated ones.

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A compact tri-band microstrip filter with independently tunable passbands and high selectivity

Cited by 3 publications

References 16 publications

Switched integrated band-pass filter bank utilizing 0.25-um pHMET GaAs process for S-, C-, and X-band applications

Switched integrated band-pass filter bank utilizing 0.25-um pHMET GaAs process for S-, C-, and X-band applications

A novel reconfigurable tri-mode resonator and its application to bandpass filter

A highly selective tri‐band bandpass‐to‐bandstop filter with the third band independently tunable

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