A Compact Bandstop Filter Based on Two Meandered Parallel-Coupled Lines

Cui, Dongnuan; Liu, Yuanan; Wu, Yongle; Li, Shulan; Yu, Cuiping

doi:10.2528/pier11061902

Cited by 28 publications

(24 citation statements)

References 16 publications

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“…Moreover, parallel coupled-lines and interdigital coupled-lines are widely used in bandpass filter design to reject the lower and upperstopbands due to their bandpass properties [20][21][22][23][24][25][26][27][28].…”

Section: Introductionmentioning

confidence: 99%

Rotationally Symmetric Coupled-Lines Bandpass Filter With Two Transmission Zeros

Wong¹,

Wang²,

Chen³

et al. 2013

PIER

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Abstract-A rotationally symmetric short-circuited stub-loaded structure is proposed to design a microstrip-line bandpass filter with two transmission zeros near the lower and upper cut-off frequency edges of operating millimeter-wave bands. Furthermore, interdigital coupled-lines and additional resonators are integrated into the proposed rotationally symmetric bandpass filter to improve the out-of-band rejection. As design examples, the in-band and out-of-band performances of two filter prototypes using single layer microstrip-lines are designed and experimentally examined. The measured results show that the filter without any interdigital coupledlines achieves a passband insertion loss of 0.97 dB at 40 GHz and out-ofband rejection of larger than 23 dB, while the filter with the interdigital coupled-lines realizes the suppressions in lower and upper-bands of, respectively, larger than 30 dB and 19 dB for the overall insertion loss of 2.1 dB at 40 GHz.

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Section: Introductionmentioning

confidence: 99%

Rotationally Symmetric Coupled-Lines Bandpass Filter With Two Transmission Zeros

Wong¹,

Wang²,

Chen³

et al. 2013

PIER

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“…In response to the needs from various communication systems, microwave passive filters are widely developed and studied in [1][2][3][4][5][6][7]. However, these designs have not clearly presented their exact applications, especially the performances, in communication systems.…”

Section: Introductionmentioning

confidence: 99%

A Novel Narrow Bandpass Filter for Image Rejection and Channel Selection in a Wireless Sleep Apnoea Monitoring System

Yang¹,

Roy²,

Karmakar³

et al. 2012

PIER

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Abstract-A highly compact bandpass filter (BPF) is designed with a capacitively-coupled compact ring resonator. The ground plane is perturbed with a combination of two inter-digital and two spiral defected ground structures (DGSs), which enhance the selectivity and suppress the higher order harmonics of the BPF respectively. The filter has a selectivity of 0.22 dB/MHz, passband insertion loss (IL) of 1.55 dB and bandwidth of 61 MHz at 2.53 GHz. The proposed compact ring resonator yields a size reduction of 70.5% compared to a conventional ring resonator. This BPF is significant for wireless telemetry monitoring systems for physiological parameters including electrocardiogram (ECG), electroencephalography (EEG) and electromyography (EMG) using portable devices.

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“…Rapid development of wireless and mobile communication systems needs more and more bandpass filters with stringent frequency selectivity, low profile, and wide stopband [1,2]. Microwave dual-mode filters with high performance and compact size have been widely used and been implemented by metal waveguide and microstrip in various communication systems [3].…”

Section: Introductionmentioning

confidence: 99%

A Novel Dual Mode Substrate Integrated Waveguide Filter With Mixed Source-Load Coupling (Mslc)

Xu¹,

Shi²,

Xu³

et al. 2013

PIER

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Abstract-A novel single-cavity dual mode substrate integrated waveguide (SIW) filter with mixed source-load coupling (MSLC) is presented. By using an interdigital slot-line (ISL) to introduce mixed coupling between source and load, the proposed filter with only one cavity could have three transmission zeros which can be controlled flexibly. Under the circumstances, the filter exhibits better frequency selectivity in comparison with conventional dual mode SIW filters. An experimental filter with a center frequency of 10 GHz and a 3 dB fractional bandwidth of 6.0% is designed, fabricated, and measured to validate the proposed structure. Measured results are provided to show good performance and in agreement with the simulated ones.

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A Compact Bandstop Filter Based on Two Meandered Parallel-Coupled Lines

Cited by 28 publications

References 16 publications

Rotationally Symmetric Coupled-Lines Bandpass Filter With Two Transmission Zeros

Rotationally Symmetric Coupled-Lines Bandpass Filter With Two Transmission Zeros

A Novel Narrow Bandpass Filter for Image Rejection and Channel Selection in a Wireless Sleep Apnoea Monitoring System

A Novel Dual Mode Substrate Integrated Waveguide Filter With Mixed Source-Load Coupling (Mslc)

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