Miniaturized microstrip dual-band bandpass filter with wide upper stop-band bandwidth

Khani, Shiva; Danaie, Mohammad; Rezaei, Pejman

doi:10.1007/s10470-018-1254-x

Cited by 49 publications

(24 citation statements)

References 35 publications

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“…2 Moreover, dualband filter with wide stopband is essential for interference management, especially in the scenarios of heterogeneous wireless systems coexistence. [3][4][5][6][7] Use of a high-temperature superconductor (HTS) is one of the effective ways to realize a dual-band filter with these desirable characteristics, however, this technology is highly expensive, and the filter size is prohibitively large for portable applications. The simplest way to construct a dual-band bandpass filter (BPF) involves combining two single-band filters.…”

Section: Index Termsmentioning

confidence: 99%

“…This requirement has created a demand for dual‐band microwave bandpass filters (BPF) that possess characteristics of sharp skirt and low insertion‐loss for the efficient and flexible utilization of the limited and expensive frequency spectrum . Moreover, dual‐band filter with wide stopband is essential for interference management, especially in the scenarios of heterogeneous wireless systems coexistence …”

Section: Introductionmentioning

confidence: 99%

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Quasi‐elliptic dual‐band planar BPF with high‐selectivity and high inter‐band isolation for 5G communications systems

Riaz

Virdee

Shukla

et al. 2019

Micro & Optical Tech Letters

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A novel dual‐band planar bandpass filter structure is presented that exhibits the following characteristics: (a) a quasi‐elliptic function response with high passband selectivity; (b) high inter‐band isolation; and (3) a wide out‐of‐band rejection. The filter is suitable for highly demanding wireless communications systems where the channel capacity is at a premium. The via‐free dual‐band filter consists of open‐loop resonators that are shunt loaded with a half‐wavelength open‐circuit stub. The resonators are coupled electromagnetically to the stepped impedance resonators, which are inter‐digitally coupled to the input/output feed lines. Altering the dimensions of the two stubs allow modification of the resonant mode and transmission zero frequencies. Measured results validate the filter's performance. The center frequencies of the two passband responses at 4.6 GHz and 5.4 GHz have 3‐dB fractional bandwidth of 13.5% and 11.5%, respectively. Insertion‐loss at the two passband center frequencies are 1.02 and 0.8 dB, and the return‐loss is better than 20 dB. Skirt steepness of the filter is >290 dB/GHz, and isolation between the two closely positioned adjacent bands is better than 35 dB.

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Section: Index Termsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Quasi‐elliptic dual‐band planar BPF with high‐selectivity and high inter‐band isolation for 5G communications systems

Riaz

Virdee

Shukla

et al. 2019

Micro & Optical Tech Letters

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“…Circuit size miniaturization is another important research focus in microwave filters. Bandpass filter miniaturization has been performed in Khani et al (2019) using a combination of bent microstrip lines, rectangular resonators and stepped impedance resonators. A novel metamaterial-based miniaturized dual bandpass filter is described in Danaeian et al (2018) for wireless local area network (WLAN) applications with a footprint of 0.17 λ eff × 0.048 λ eff .…”

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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“…As a result, a variety of plasmonic devices based on MIM waveguides have been designed, such as optical sensors [8,9], demultiplexers [10,11], slow light waveguides [12,13], switches [14,15], logic gates [16,17] and so on. Besides, the MIM structures are a relatively new method for design of previous microwave microstrip filters [18][19][20][21].…”

Section: Introductionmentioning

confidence: 99%

Tunable single‐mode bandpass filter based on metal–insulator–metal plasmonic coupled U‐shaped cavities

Khani

Danaie

Rezaei

2019

IET Optoelectronics

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Miniaturized microstrip dual-band bandpass filter with wide upper stop-band bandwidth

Cited by 49 publications

References 35 publications

Quasi‐elliptic dual‐band planar BPF with high‐selectivity and high inter‐band isolation for 5G communications systems

Quasi‐elliptic dual‐band planar BPF with high‐selectivity and high inter‐band isolation for 5G communications systems

Design and implementation of miniaturized tri-band microwave bandpass filter

Tunable single‐mode bandpass filter based on metal–insulator–metal plasmonic coupled U‐shaped cavities

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