Compact Dual-Mode Microstrip Bandpass Filters With Transmission Zeros Using Modified Star Shaped Resonator

Rao, I. Srinivasa

doi:10.2528/pierc16122801

Cited by 6 publications

(2 citation statements)

References 16 publications

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“…Among the reported resonator structures such as star-shaped ring (Wei and Kewei, 2012), square patch (Yeh et al , 2014; Mezaal et al , 2018; Liu et al , 2019; Cheng et al , 2019; Zhao et al , 2020), octagonal patch (Karthie and Salivahanan, 2019), star-shaped loop (Avinash and Rao, 2017) and hexagonal loop (Song et al , 2017) with different patch/slot as perturbation elements, the proposed square patch resonator with a diagonal square perturbation patch exhibits a compact size of 7.35 × 7.35 mm 2 and a size reduction of 61%, respectively. Amid the filter designs fabricated on RT/duroid 6010 substrate with a relative permittivity of 10.2, the proposed structure offers more miniaturization on the same substrate in addition to the filter designs by Wei and Kewei (2012), Liu et al (2019) and Cheng et al (2019) on different substrates.…”

Section: Fabrication and Measurementmentioning

confidence: 99%

“…Several other resonator structures with perturbation elements such as a star-shaped ring with a trapezoidal patch (Wei and Kewei, 2012), hexagonal loop with corner patch (Song et al , 2017) and octagonal fractal patch with a square patch (Karthie and Salivahanan, 2019) were also demonstrated with size reductions of 37, 46.6 and 22%, respectively. Besides, a star-shaped loop resonator structure with triangular patch perturbation (Avinash and Rao, 2017) was also realized with a compact size of 9 × 12 mm 2 .…”

Section: Introductionmentioning

confidence: 99%

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Compact dual-mode microstrip bandpass filter based on slotted square patch resonator

Karthie¹,

J.²,

Yogeshwari³

et al. 2021

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Purpose The purpose of this paper is to present the design of a compact microstrip bandpass filter (BPF) in dual-mode configuration loaded with cross-loop and square ring slots on a square patch resonator for C-band applications. Design/methodology/approach In the proposed design, the dual-mode response for the filter is realized with two transmission zeros (TZs) by the insertion of a perturbation element at the diagonal corner of the square patch resonator with orthogonal feed lines. Such TZs at the edges of the passband result in better selectivity for the proposed BPF. Moreover, the cross-loop and square ring slots are etched on a square patch resonator to obtain a miniaturized BPF. Findings The proposed dual-mode microstrip filter fabricated in RT/duroid 6010 substrate using PCB technology has a measured minimum insertion loss of 1.8 dB and return loss better than 24.5 dB with a fractional bandwidth (FBW) of 6.9%. A compact size of 7.35 × 7.35 mm2 is achieved for the slotted patch resonator-based dual-mode BPF at the center frequency of 4.76 GHz. As compared with the conventional square patch resonator, a size reduction of 61% is achieved with the proposed slotted design. The feasibility of the filter design is confirmed by the good agreement between the measured and simulated responses. The performance of the proposed filter structure is compared with other dual-mode filter works. Originality/value In the proposed work, a compact dual-mode BPF is reported with slotted structures. The conventional square patch resonator is deployed with cross-loop and square ring slots to design a dual-mode filter with a square perturbation element at its diagonal corner. The proposed filter exhibits compact size and favorable performance compared to other dual-mode filter works reported in literature. The aforementioned design of the dual-mode BPF at 4.76 GHz is suitable for applications in the lower part of the C-band.

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