Miniaturized Microstrip Lowpass Filter With Ultra-Wide Stopband Performance Using Trapezoid Patch Resonators

Yu, Bing Xie and Hongbin

doi:10.2528/pierl19062606

Cited by 2 publications

(1 citation statement)

References 10 publications

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“…Filters and antennas are fundamental components that are extensively used in wireless communication systems [1]. As modern technologies are developing rapidly, miniaturization and integration are significantly demanded for RF front-end receivers.…”

Section: Introductionmentioning

confidence: 99%

A Filtering Dielectric Resonator Antenna With High Band-Edge Selectivity

Gao¹,

Jiao²,

Weng³

et al. 2020

PIER M

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A filtering rectangle dielectric resonator antenna (DRA) with high band-edge selectivity is proposed in this paper. The DRA is fed by a simple hybrid feeding structure consisting of a microstripcoupled slot on the bottom and a thin metallic strip on the side of DRA to excite the fundamental TE y 1δ1 mode. The feeding structure establishes a cross-coupled mechanism which includes electric and magnetic coupling. This mechanism introduces two radiation nulls at the band edge without any filtering circuits. By using the designed hybrid feeding structure, a bandpass filtering response is obtained. For enhancing band-edge selectivity, a shorted stub is introduced to weaken the coupling between the two microstrip stubs of the feeding structure. A wide impedance bandwidth of 19% and a flat gain around 5.6 dBi are realized. To validate the proposed design, a prototype is fabricated and measured, showing a favorable agreement with the simulated results.

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Section: Introductionmentioning

confidence: 99%

A Filtering Dielectric Resonator Antenna With High Band-Edge Selectivity

Gao¹,

Jiao²,

Weng³

et al. 2020

PIER M

View full text Add to dashboard Cite

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A microstrip planar lowpass filter with ultra-wide stopband using hexagonal-shaped resonators

2021

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A microstrip planar lowpass filter with ultra-wide stopband up to 40 GHz is presented. The filter is designed based on four types of hexagonal-shaped resonators, producing multiple transmission zeroes and extending the stopband. The high-impedance transmission line is folded to make the circuit more compact and form the coupling gaps between the adjacent resonators. A pair of folded open stubs are added to enhance the cut-off rate. As a result, an ultra-wide stopband with 23rd-harmonic suppression has been attained. A demonstration filter has been designed and fabricated with 3 dB cut-off frequency of 1.70 GHz. The measured results show that the relative stop bandwidth of the low-pass filter (LPF) is 182% with suppression level of 25 dB, covering 1.85–40 GHz. The functional area size of the filter is 21.50 × 21.70 mm, which corresponds to 0.198λ g × 0.200λ g (λ g is the guided wavelength at 3 dB cut-off frequency).

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Miniaturized Microstrip Lowpass Filter With Ultra-Wide Stopband Performance Using Trapezoid Patch Resonators

Cited by 2 publications

References 10 publications

A Filtering Dielectric Resonator Antenna With High Band-Edge Selectivity

A Filtering Dielectric Resonator Antenna With High Band-Edge Selectivity

A microstrip planar lowpass filter with ultra-wide stopband using hexagonal-shaped resonators

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