Bandpass Filter Using Miniaturized SCRLH Mzor

Wang, Jikang; Zhao, Yongjiu; Liu, Wei; Sun, Quan; Long, Qiang

doi:10.2528/pierl10110403

Cited by 3 publications

(4 citation statements)

References 8 publications

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“…Recently, the wireless area networks (WLAN) systems have expanded rapidly, which demands much more applications, thus numerous filters have been researched [1][2][3][4][5][6][7][8][9][10][11][12][13][14]. However, because of the distributed characteristics of the transmission lines, these filters suffer from spurious passbands, which may reduce rejection levels in the upper stopband.…”

Section: Introductionmentioning

confidence: 99%

A 2.4 GHZ Bandpass Filter with Harmonic Suppression using Hook-Shaped Resonators

Zhang

Jiao

Wang

et al. 2011

Journal of Electromagnetic Waves and Applications

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By using hook-shaped resonators with different lengths, a compact 2.4 GHz bandpass filter with harmonic suppression is presented in this paper. Adjusting widths and lengths of the strips, it is convenient to control the third and fifth harmonic suppression separately without affecting the passband performance. To verify the proposed idea, a topology is implemented. The measured results show the insertion loss of 1.03 dB and the return loss of 11.6 dB at the center frequency (2.415 GHz) of the passband. Furthermore, 31.08 dB suppression for the third harmonic and 42.43 dB suppression for the fifth harmonic are achieved while maintaining the designed passband characteristics unaltered. Good agreement is obtained between simulations and measurements.

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Section: Introductionmentioning

confidence: 99%

A 2.4 GHZ Bandpass Filter with Harmonic Suppression using Hook-Shaped Resonators

Zhang

Jiao

Wang

et al. 2011

Journal of Electromagnetic Waves and Applications

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“…However, interdigital capacitors incorporated in microstrip CRLH ZORs often possess large sizes and inherently low self‐resonant frequencies, being unfavorable to filter miniaturization and limiting their use in higher microwave frequencies. Consequently, some simplified CRLH (SCRLH) ZORs were proposed by omitting the interdigital parts, while they can still implement zeroth‐ and higher‐order resonances, appealing in the filter miniaturization with more concise structures 5,6 . In Gong and Chu, 6 an SCRLH ZOR was applied to design an S‐band three‐order Chebyshev‐coupled microstrip bandpass filter (BPF), achieving a clear size reduction in comparison to the conventional BPF with have‐wavelength resonators, but its adoption of relatively complex interdigital coupling interstages and aperture‐backed dual‐finger parallel‐coupled terminals increases the fabrication complexity.…”

Section: Introductionmentioning

confidence: 99%

“…Consequently, some simplified CRLH (SCRLH) ZORs were proposed by omitting the interdigital parts, while they can still implement zeroth-and higher-order resonances, appealing in the filter miniaturization with more concise structures. 5,6 In Gong and Chu, 6 an SCRLH ZOR was applied to design an S-band three-order Chebyshevcoupled microstrip bandpass filter (BPF), achieving a clear size reduction in comparison to the conventional BPF with have-wavelength resonators, but its adoption of relatively complex interdigital coupling interstages and aperture-backed dual-finger parallel-coupled terminals increases the fabrication complexity. To cope with these problems, an improved SCRLH ZOR (ISZOR) is proposed in this paper.…”

Section: Introductionmentioning

confidence: 99%

Improved SCRLH ZOR‐based compact microstrip bandpass filter with wide upper stopband

Zeng

Gong

et al. 2022

Micro & Optical Tech Letters

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A novel compact microstrip bandpass filter (BPF) based on an improved simplified composite right‐/left‐handed (SCRLH) zeroth‐order resonator (ZOR) is presented in this paper. The improved SCRLH ZOR (ISZOR) can substantially simplify the filter configuration and shrink the filter size as well as ensure a wide upper stopband. A certain orientation of two ISZORs allows a larger gap to produce the specified interstage capacitive coupling, easing the requirement for fabrication precision. Starting from the purely lumped circuit model, the microstrip ISZOR is efficiently generated by utilizing the implicit space mapping technique, with which the microstrip BPF is then constructed and optimized by the Nelder–Mead simplex algorithm. A three‐pole filter with a center frequency of 3.1 GHz and a relative bandwidth of 5% is exemplified to illustrate the design process. The measurement shows that the filter is of good bandpass selectivity, with a transversal size reduction of more than 64% compared to a former counterpart and a rejection level better than 30 dB up to 11.76 GHz (close to 4f0).

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“…Similarly, coupled mechanism bandpass filters can lead to a small size and sharp CRLH filters [11][12][13]. Different methods of compact and sharp multi-band CRLH filters are also proposed [14][15][16][17][18][19][20][21][22][23].…”

Section: Introductionmentioning

confidence: 99%

A Double Optimized Transmission Zeros Based on Pi-CRLH Dual-Band Bandpass Filter

Hassan¹,

Abdalla²

2019

PIER Letters

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In this paper, design and measurements of a highly selective π-CRLH dual-band bandpass filter, with transmission zeros optimized to serve Wi-Max applications, is presented. The dual-bands are designed at 5.2 and 5.7 GHz with a sharp rejection level between them and transmission zeros before and after the passbands. The filter is designed using coupled gap zeroth order composite right/lefthanded (CRLH) resonators, which results in significant filter size reduction. Furthermore, two different coupled π-CRLH filters are discussed through the work development of this paper. The filter design concepts are verified and confirmed using electromagnetic simulations and experimental measurements. Presented results reveal that the proposed filter exhibits a rejection level greater than −20 dB, while maintaining 2 dB insertion loss and better than −25 dB for the transmission zeros with compact size (12 × 16 mm 2) which is 70% smaller than similar conventional filters.

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Bandpass Filter Using Miniaturized SCRLH Mzor

Cited by 3 publications

References 8 publications

A 2.4 GHZ Bandpass Filter with Harmonic Suppression using Hook-Shaped Resonators

A 2.4 GHZ Bandpass Filter with Harmonic Suppression using Hook-Shaped Resonators

Improved SCRLH ZOR‐based compact microstrip bandpass filter with wide upper stopband

A Double Optimized Transmission Zeros Based on Pi-CRLH Dual-Band Bandpass Filter

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