Compact quasi-elliptic microstrip lowpass filter with wide stopband

J. Wang; L. J. Xu; S. Zhao; Y. X. Guo; W. Wu

doi:10.1049/el.2010.1569

Compact quasi-elliptic microstrip lowpass filter with wide stopband

J. Wang, L. J. Xu, S. Zhao, Y. X. Guo, W. Wu

Research output: Journal Publications and Reviews › RGC 21 - Publication in refereed journal › peer-review

81 Citations (Scopus)

Abstract

A compact microstrip lowpass filter with quasi-elliptic response is proposed. To achieve compact design, both symmetrically loaded radial-shape patches and meandered main transmission line are adopted. To realise the quasi-elliptic response and strengthen the roll-off sharpness for the filter, a coupled capacitor between adjacent radial-shape patches is introduced in interdigital form. Furthermore, the adoption of radial-shape patches and the interdigital structure can introduce both serial and parallel resonance in the circuit. Thus, a wide stopband with 7th harmonic suppression is achieved. A demonstration filter with 3dB cutoff frequency at 1.18GHz has been designed, fabricated and measured. Results show that a relative stopband bandwidth of 132.3 (referred to a suppression degree of 15dB) is obtained while achieving a high figure-of-merit of 11543. © 2010 The Institution of Engineering and Technology.

Original language	English
Pages (from-to)	1384-1385
Journal	Electronics Letters
Volume	46
Issue number	20
DOIs	https://doi.org/10.1049/el.2010.1569
Publication status	Published - 30 Sept 2010
Externally published	Yes

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Publication details (e.g. title, author(s), publication statuses and dates) are captured on an “AS IS” and “AS AVAILABLE” basis at the time of record harvesting from the data source. Suggestions for further amendments or supplementary information can be sent to [email protected].

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title = "Compact quasi-elliptic microstrip lowpass filter with wide stopband",

abstract = "A compact microstrip lowpass filter with quasi-elliptic response is proposed. To achieve compact design, both symmetrically loaded radial-shape patches and meandered main transmission line are adopted. To realise the quasi-elliptic response and strengthen the roll-off sharpness for the filter, a coupled capacitor between adjacent radial-shape patches is introduced in interdigital form. Furthermore, the adoption of radial-shape patches and the interdigital structure can introduce both serial and parallel resonance in the circuit. Thus, a wide stopband with 7th harmonic suppression is achieved. A demonstration filter with 3dB cutoff frequency at 1.18GHz has been designed, fabricated and measured. Results show that a relative stopband bandwidth of 132.3 (referred to a suppression degree of 15dB) is obtained while achieving a high figure-of-merit of 11543. {\textcopyright} 2010 The Institution of Engineering and Technology.",

author = "J. Wang and Xu, {L. J.} and S. Zhao and Guo, {Y. X.} and W. Wu",

note = "Publication details (e.g. title, author(s), publication statuses and dates) are captured on an “AS IS” and “AS AVAILABLE” basis at the time of record harvesting from the data source. Suggestions for further amendments or supplementary information can be sent to [email protected].",

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doi = "10.1049/el.2010.1569",

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TY - JOUR

T1 - Compact quasi-elliptic microstrip lowpass filter with wide stopband

AU - Wang, J.

AU - Xu, L. J.

AU - Zhao, S.

AU - Guo, Y. X.

AU - Wu, W.

N1 - Publication details (e.g. title, author(s), publication statuses and dates) are captured on an “AS IS” and “AS AVAILABLE” basis at the time of record harvesting from the data source. Suggestions for further amendments or supplementary information can be sent to [email protected].

PY - 2010/9/30

Y1 - 2010/9/30

N2 - A compact microstrip lowpass filter with quasi-elliptic response is proposed. To achieve compact design, both symmetrically loaded radial-shape patches and meandered main transmission line are adopted. To realise the quasi-elliptic response and strengthen the roll-off sharpness for the filter, a coupled capacitor between adjacent radial-shape patches is introduced in interdigital form. Furthermore, the adoption of radial-shape patches and the interdigital structure can introduce both serial and parallel resonance in the circuit. Thus, a wide stopband with 7th harmonic suppression is achieved. A demonstration filter with 3dB cutoff frequency at 1.18GHz has been designed, fabricated and measured. Results show that a relative stopband bandwidth of 132.3 (referred to a suppression degree of 15dB) is obtained while achieving a high figure-of-merit of 11543. © 2010 The Institution of Engineering and Technology.

AB - A compact microstrip lowpass filter with quasi-elliptic response is proposed. To achieve compact design, both symmetrically loaded radial-shape patches and meandered main transmission line are adopted. To realise the quasi-elliptic response and strengthen the roll-off sharpness for the filter, a coupled capacitor between adjacent radial-shape patches is introduced in interdigital form. Furthermore, the adoption of radial-shape patches and the interdigital structure can introduce both serial and parallel resonance in the circuit. Thus, a wide stopband with 7th harmonic suppression is achieved. A demonstration filter with 3dB cutoff frequency at 1.18GHz has been designed, fabricated and measured. Results show that a relative stopband bandwidth of 132.3 (referred to a suppression degree of 15dB) is obtained while achieving a high figure-of-merit of 11543. © 2010 The Institution of Engineering and Technology.

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U2 - 10.1049/el.2010.1569

DO - 10.1049/el.2010.1569

M3 - RGC 21 - Publication in refereed journal

SN - 0013-5194

VL - 46

SP - 1384

EP - 1385

JO - Electronics Letters

JF - Electronics Letters

IS - 20

ER -

Compact quasi-elliptic microstrip lowpass filter with wide stopband

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