A simple method to design a tri-bandpass filter using open-loop uniform impedance resonators

Weng, Min‐Hang; Hsu, Ching‐Wei; Lin, Yuanmo; Tsai, Chung‐Ying; Yang, Ru‐Yuan

doi:10.1080/09205071.2019.1689181

Cited by 11 publications

(8 citation statements)

References 17 publications

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“…Moreover, the space, S 1 , should be minimal for achieving a lower insertion loss. Table 1 summarizes the comparison of the proposed triple-band BPF with other state-of-the-art filters in the literature, proving that the presented filter has a low insertion loss, wide bandwidth, and compact size as well as the potential to be utilized in WiMAX, RFID, and other tri-band applications [10][11][12][13][14][15][16][17][18][20][21][22].…”

Section: Resultsmentioning

confidence: 95%

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Compact Tri-band Bandpass Filter Based on Asymmetric Step Impedance Resonators for WiMAX and RFID Systems

Basit

Khattak

Althuwayb

et al. 2021

J Electromagn Eng Sci

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In this article, a simple method is developed to design a highly miniaturized tri-band bandpass filter (BPF) utilizing two asymmetric coupled resonators with one step discontinuity and one uniform impedance resonator (UIR) for worldwide interoperability for microwave access (WiMAX) and radio frequency identification (RFID) applications. The first and second passbands located at 3.7 GHz and 6.6 GHz are achieved through two asymmetric coupled step impedance resonators (SIRs), while the third passband, centered at 9 GHz, is achieved using a half-wavelength UIR, respectively. The fundamental frequencies of this BPF are implemented by tuning the physical length ratio (α) and impedance ratio (R) of the asymmetric SIRs. The proposed filter is designed and fabricated with a circuit dimension of 13.69 mm × 25 mm (0.02 λg × 0.03 λg), where λg represents the guided wavelength at the first passband. The experimental and measured results are provided with good matching.

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Section: Resultsmentioning

confidence: 95%

“…Moreover, the later study had poor insertion loss as well as low FBW. Recently a uniform impedance resonator (UIR)-based tri-band filter was designed and implemented in [17]. The proposed design included a larger circuit area, poor FBW, and insertion losses.…”

Section: Introductionmentioning

confidence: 99%

Compact Tri-band Bandpass Filter Based on Asymmetric Step Impedance Resonators for WiMAX and RFID Systems

Basit

Khattak

Althuwayb

et al. 2021

J Electromagn Eng Sci

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show abstract

“…The filter is characterized by an insertion loss of less than 1.7 dB and has reconfigurable multi-band/wideband characteristics. Uniform open-loop resonators are exploited in Weng et al (2020) for tri-band operation at 1.93, 2.6 and 3.9 GHz with a circuit size of 0.54 λ eff × 0.77 λ eff . The tri-band bandpass filter in Rahman et al (2018) makes use of double resonators to realize passband conditions at 0.98, 1.57 and 1.88 GHz.…”

Section: Introductionmentioning

confidence: 99%

Design and implementation of miniaturized tri-band microwave bandpass filter

Ponnammal

Manjula

2022

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Purpose This paper is aimed to study the design of a miniaturized filter with tri-band characteristics. In this paper, perturbation is used to realize circuit miniaturization and multi-band by exploiting the inductive property. During this process, vias are added for twofold benefit, namely, circuit miniaturization and enhanced frequency selectivity at high frequency. Thus, with the introduction of the shorting via, the single-band dual-mode bandpass filter is converted into a tri-band filter with a smaller electrical size. Design/methodology/approach This paper presents the design and characterization of a miniaturized two-port filter with tri-band operating characteristics. The proposed filter is constructed using a square patch resonator operating at 5.2 GHz with a capacitively coupled feed configuration. A square perturbation is added to the corner of the square patch to achieve diagonal symmetry and to excite dual mode. The perturbation offers a sharp transmission zero defining bandwidth of the proposed filter. In addition, a shorting post is introduced to achieve an 88% size reduction by lowering the operating frequency to 1.8 GHz. Findings The prototype filter has insertion less than 1.2 dB and return loss better than 12 dB throughout all the realized frequency bands. The prototype filter is fabricated and the simulation results are validated using experimental measurements. The realized fractional bandwidths of the proposed bandpass filter are 11/5.6/1 at 1.8/4.6/5.85 GHz, respectively. The quality factor of the proposed antenna is greater than 80 and a peak Q-factor of 387 is realized at 5.85 GHz. The high Q-factor indicates low loss and improved selectivity. The rejection levels in the stopband are greater than 20 dB. Originality/value The results indicate that the proposed filter is a suitable choice for low-power small-scale wireless systems operating in the microwave bands. The realized filter has the smallest footprint of 0.36λeff × 0.19λeff where λeff is the effective wavelength calculated at the lowest frequency of operation.

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“…In [18], a compact three stubs loaded open-loop resonator-based triple bandpass filter is presented. In [19], resonators with open loops for filters with three pass bands are designed. In [20], a bandpass filter for triple bands using metamaterials is proposed.…”

Section: Introductionmentioning

confidence: 99%

Metamaterial-Inspired Compact Single and Multiband Filters

Sowjanya¹,

Vakula²

2022

Adv. sci. technol. eng. syst. j.

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In this paper, Compact bandpass filters have been designed. A single bandpass filter was designed using novel triple concentric complementary split-ring resonators placed along the microstrip line in the ground plane. Gaps and via were placed on the microstrip line to control electromagnetic characteristics, resulting in a single bandpass filter. In turn, spiral resonators were attached to the microstrip transmission line at the gaps in the transmission line to obtain a compact dual passband filter. Stepped impedance microstrip line and Tshaped stubs were attached to the microstrip line in between spiral resonators. The structure designed resulted in a Triple bandpass filter. A fractional bandwidth of 3% was achieved at the center frequency of 3GHz. The filter had a 1.5dB insertion loss which is the minimum value in the operating frequency band. The filter resonance frequency was 1.32 GHz and 2.47GHz which have a fractional bandwidth of 7.5% and 4.85% respectively and the corresponding insertion loss was 1.3dB and 1.8dB respectively. The triple bandpass filter had a fractional bandwidth of 1. 16%, 11.4%, and 1.86%, centered at 1.29 GHz, 2.27 GHz, and 3.21GHz with 1.6dB, 1.3dB, and 1.8 dB insertion loss at the respective frequencies. The proposed bandpass filters are useful for GPS, WLAN, WiMAX, and radar applications.

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A simple method to design a tri-bandpass filter using open-loop uniform impedance resonators

Cited by 11 publications

References 17 publications

Compact Tri-band Bandpass Filter Based on Asymmetric Step Impedance Resonators for WiMAX and RFID Systems

Compact Tri-band Bandpass Filter Based on Asymmetric Step Impedance Resonators for WiMAX and RFID Systems

Design and implementation of miniaturized tri-band microwave bandpass filter

Metamaterial-Inspired Compact Single and Multiband Filters

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