Improved Frequency Response of Microstrip Lowpass Filter Using Defected Ground Structures

Rekha, Thulaseedharan Kodiyattuvila; Abdulla, Parosh Aziz; Jasmine, P M; Raphika, and Paruthikkal Mohammed

doi:10.2528/pierc17112002

Cited by 8 publications

(9 citation statements)

References 13 publications

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“…In modern broadband wireless communication systems, there is an urgent need for microwave circuits, which can provide high data rate and high transmission capacity. Recently, various high‐performance wideband bandpass filters (WBBPFs) have been proposed 1‐12 . As a straightforward method, cascading lowpass filter and highpass filter is a practical approach for WBBPF design, 1,2 but it usually suffers from larger circuit dimensions.…”

Section: Introductionmentioning

confidence: 99%

Design of wideband bandpass filter with high and wide stopband rejection using asymmetrical‐loaded stepped ‐impedance resonator

Xiong¹,

Wang

2020

Int J RF Microw Comput Aided Eng

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This study presents a wideband bandpass filter (WBBPF) with wide and high stopband suppression by loading a stepped-impedance resonator (SIR). The prototype of WBBPF is composed of an inverted π-shaped resonator with T-shaped resonator and open stub loaded, centrally. Odd-/even-mode analysis technique is employed to characterize the resonant properties of this prototype. Then, a SIR is loaded to this filter, asymmetrically, to improve the out-of-band performance. For experimental validation, a WBBPF is designed, fabricated, and tested. The measurement results show that the center frequency of WBBPF is located at 5.095 GHz, and the 3-dB fraction bandwidth is about 71%. Plus, the out-of-band suppression with 30-dB rejection level can be extended to 18.17 GHz.

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Section: Introductionmentioning

confidence: 99%

Design of wideband bandpass filter with high and wide stopband rejection using asymmetrical‐loaded stepped ‐impedance resonator

Xiong¹,

Wang

2020

Int J RF Microw Comput Aided Eng

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“…However, it is hard to achieve compact size and high performance simultaneously. Thus, techniques to achieve both size reduction and performance enhancement have been studied in recent years [2][3][4][5][6][7][8][9][10][11].…”

Section: Introductionmentioning

confidence: 99%

“…The usual approach to design a compact lowpass filter with ultra-wide stopband performance and compact size is to form a lowpass filter by cascading multiple resonators [3][4][5][6][7][8][9][10][11]. A lowpass filter was designed by cascading multi-radial patch resonators in [3], but the size of the filter was relatively large.…”

Section: Introductionmentioning

confidence: 99%

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

Yu¹

2019

PIER Letters

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A new miniaturized microstrip lowpass filter with ultra-wide stopband performance using trapezoid patch resonators is investigated. To achieve compact design and ultra-wide band rejection, trapezoid patch resonators are employed in the filter. To further reduce the circuit size of the filter, a meander transmission line is also introduced in the design. A demonstration filter with 3 dB cutoff frequency at 0.50 GHz has been designed, fabricated, and measured. Results indicate that the proposed filter is able to suppress the 26 th harmonic response referred to a suppression degree of 15 dB. Furthermore, the proposed filter exhibits a small size of 0.122λ g × 0.109λ g , where λ g is the guided wavelength at 0.50 GHz.

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“…The second method is to design a lowpass filter by using modified stepped impedance hairpin resonators [7][8][9][10][11]. Using a stepped impedance hairpin resonator with radial stubs, Wei et al proposed a lowpass filter with 7th harmonic suppression performance [7].…”

Section: Introductionmentioning

confidence: 99%

“…In addition, using defected ground structure is also a popular and useful way. A lowpass filter composed of semicircle defected ground structures and semicircle stepped-impedance shunt stubs is proposed in [10,11], but the circuit complexity and circuit size should be reduced.…”

Section: Introductionmentioning

confidence: 99%

Compact Microstrip Lowpass Filter With Ultra-Wide Stopband Performance Using Radial Stub Loaded Resonators

Zhang¹,

Zhao²

2018

PIER M

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Abstract-A new microstrip lowpass filter using radial stub loaded resonators is presented. A microstrip high impedance main transmission line loaded with five radial stub loaded resonators by five high impendence transmission lines is introduced in the design of the filter. Owing to the introduction of the radial stub structure, the filter achieves compact size and ultra-wide stopband. A demonstration filter with 3 dB cutoff frequency at 0.8 GHz has been designed, fabricated and measured. Results indicate that the proposed filter is able to suppress the 17th harmonic response referred to a suppression degree of 15 dB, together with a small size of 0.060λ g × 0.080λ g , where λ g is the guided wavelength at 0.8 GHz.

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Improved Frequency Response of Microstrip Lowpass Filter Using Defected Ground Structures

Cited by 8 publications

References 13 publications

Design of wideband bandpass filter with high and wide stopband rejection using asymmetrical‐loaded stepped ‐impedance resonator

Design of wideband bandpass filter with high and wide stopband rejection using asymmetrical‐loaded stepped ‐impedance resonator

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

Compact Microstrip Lowpass Filter With Ultra-Wide Stopband Performance Using Radial Stub Loaded Resonators

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