Broadband bandpass filters using slotted resonators fed by interdigital coupled lines for improved upper stopband performances

Meeloon, Mongkol; Chaimool, Sarawuth; Akkaraekthalin, Prayoot

doi:10.1016/j.aeue.2008.03.005

Cited by 12 publications

(5 citation statements)

References 20 publications

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“…MMR is formed by attaching slotted resonators in the middle of linear tapered-line resonator for extending stopband in the upper frequency to be larger than 10 dB over 12 GHz to 18 GHz. Thus, microstrip SLTRs have been proposed as shown in [4] for higher stopband performances.…”

Section: Filter Design and Notched Band Characteristicsmentioning

confidence: 99%

“…The IE3D program has been used to determine the filter performances. The optimized dimensions of the slotted resonators and the interdigital coupled lines have been obtained in the previous work [4] including l 2 = 6.45 mm, l 3 = 5.4 mm, l 4 = 11.0 mm, w 1 = 4.0 mm, w 2 = 0.5 mm, and w 4 = 5.5 mm. Also, the optimized dimensions of the embedded fold-slot at the feed line for 5.6 GHz and 9.3 GHz with dualnotched bands have been obtained to be l 1 = 10.0 mm, l 5 = 2.12 mm, l 6 = 1.47 mm, l 7 = 5.94 mm, l 8 = 1.53 mm, l 9 = 3.82 mm, w 5 = 0.6 mm, w 6 = 2.1 mm, w 7 = 0.52 mm and g 1 = 0.2 mm.…”

Section: Filter Design and Notched Band Characteristicsmentioning

confidence: 99%

“…Multi-mode resonators (MMRs) with stepped impedance structures were used for UWB bandpass filters, resulting in size reduction and improved stopband responses [2]. The capacitive-ended interdigital coupled lines were formed to assign their transmission zero towards the fourthorder resonant frequency of the MMRs [3]- [4]. Most of these UWB bandpass filters have superior performance and are suitable for implementation but they may not have wide stopband responses.…”

Section: Introductionmentioning

confidence: 99%

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An UWB bandpass filter with dual-notched band and improved stopband performance

Meeloon

Rattarasarn

Chaimool

et al. 2012

2012 9th International Conference on Electrical Engineering/Electronics, Computer, Telecommunications and Information Technolog

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This paper proposes an ultra-wideband bandpass filter based on slotted linear tapered-line resonator (SLTR) with embedded fold-slot feed structure which can create dual-notched band. The embedded fold-slot feed at both ends of resonator will be comprehensively described. The proposed filter has two notches in the passband, resulting from the embedded fold-slot feed. The center frequencies and bandwidths of both notched bands can be controlled by adjusting dimensions of the embedded fold-slot. The wider upper stopbands caused by resonator characteristics have been also obtained. The simulated and experimental results show dual-notched band around 300 MHz and 400 MHz, respectively. High stopband performances with better than 15 dB for a frequency range up to 18 GHz have also been obtained.

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Section: Filter Design and Notched Band Characteristicsmentioning

confidence: 99%

Section: Filter Design and Notched Band Characteristicsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

An UWB bandpass filter with dual-notched band and improved stopband performance

Meeloon

Rattarasarn

Chaimool

et al. 2012

2012 9th International Conference on Electrical Engineering/Electronics, Computer, Telecommunications and Information Technolog

Self Cite

View full text Add to dashboard Cite

show abstract

“…UWB-BPF has been paid attentions from research communities and industries [1]. Several circuits and techniques have been developed to operate in this frequency band [2][3][4][5][6][7][8][9][10][11][12][13]. In [4], a composite microstrip bandpass filter with more than 100% bandwidth is introduced.…”

Section: Introductionmentioning

confidence: 99%

Design of a Compact Ultra-Wideband Bandpass Filter Using Inductively Compensated Parallel-Coupled Lines

2021

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An ultra-wideband bandpass filter (UWB-BPF) using inductively compensated parallel-coupled lines (ICPCL) is presented in this article. It consists of three circuits: a high-pass filter (HPF), a lowpass filter (LPF), and a transmission line. The HPF and the LPF are independently synthesized from the ICPCL. The proposed filter can suppress unwanted frequencies in the upper stopband and increase the skirt slope of the frequency response in the transition bands. The fabricated UWB-BPF with compact size provides good passband performances, with insertion loss of better than −0.49 dB and return loss of better than −12 dB in the frequency range of 2.92–10.95 GHz (the bandwidth of 8.03 GHz). The 107% bandwidth is achieved. In addition, the proposed filter can suppress the spurious frequencies at 2f0, which is greater than 30 dB. The measured results accord well with the simulation results. The novelty of the paper is the introduction of the ICPCL for the construction of the compact UWB-BPF.

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“…On the basis of impedance steps and coupled-line sections as inverter circuits, several works were interested in the design of planar broadband filters with low loss, compact size, high suppression of spurious responses, and improved stopband performances [7,8].…”

Section: Introductionmentioning

confidence: 99%

Analyzing an UWB Bandpass Filter for High Power Applications Using Rectangular Coaxial Cables with Square Inner Conductors

Benahmed¹,

Benabdallah²,

Seghier³

et al. 2011

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Using the finite element method (FEM) in two dimensions and the CST MICROWAVE STUDIO<sup>®</sup> (CST MWS) Transient Solver, the electromagnetic (EM) analysis and the design of a novel compact ultra wideband (UWB) bandpass filter using rectangular coaxial cables with square inner conductors, convenient for high power applications, are presented. The design of the UWB BP filter is based on the use of impedance steps and coupled-line sections. The center frequency around 6.85 GHz was selected, the bandwidth is between 3-10 GHz, the insertion-loss amounts to around 0.35 dB and the return loss is found higher than 10 dB in a large frequency range (4-9.5) GHz. The simulated results of stopband performances are better than 15 dB for a frequency range up to 11 GHz. For the selected center frequency and on a substrate with a dielectric constant of 2.03, the rectangular coaxial cables BPF with square inner conductors is only 6.7 × 8.9 × 33.4 mm in size

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Broadband bandpass filters using slotted resonators fed by interdigital coupled lines for improved upper stopband performances

Cited by 12 publications

References 20 publications

An UWB bandpass filter with dual-notched band and improved stopband performance

An UWB bandpass filter with dual-notched band and improved stopband performance

Design of a Compact Ultra-Wideband Bandpass Filter Using Inductively Compensated Parallel-Coupled Lines

Analyzing an UWB Bandpass Filter for High Power Applications Using Rectangular Coaxial Cables with Square Inner Conductors

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