Band-notched ultra-wideband bandpass filter design using combined modified quarter-wavelength tri-section stepped-impedance resonator

Lee, C.-H.; Hsu, Che Ju; Chen, L.-Y.

doi:10.1049/iet-map.2008.0340

Cited by 27 publications

(31 citation statements)

References 12 publications

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“…In the recent reported literatures, several methods and structures have been proposed to implement UWB BPF with compact size, sharp roll-off, low insertion loss and wide bandwidth [1,2,3,4,5,6,7,8,9,10,11]. For example, the MMR [1], defected microstrip structure [2] and some transition structures have been widely used to design UWB BPF [3,4,5].…”

Section: Introductionmentioning

confidence: 99%

“…For example, the MMR [1], defected microstrip structure [2] and some transition structures have been widely used to design UWB BPF [3,4,5]. At the same time, to block some undesired signals such as WLAN (5.2 GHz) and ITU8.0 (8.2 GHz) in the passband of the UWB, various structures and methods have been proposed to obtain a notched band [6,7,8,9,10,11]. An L-shaped open-end slot was inserted in the TSSIR to generate a notch band at 5.5 GHz [6].…”

Section: Introductionmentioning

confidence: 99%

“…At the same time, to block some undesired signals such as WLAN (5.2 GHz) and ITU8.0 (8.2 GHz) in the passband of the UWB, various structures and methods have been proposed to obtain a notched band [6,7,8,9,10,11]. An L-shaped open-end slot was inserted in the TSSIR to generate a notch band at 5.5 GHz [6]. In [7], to achieve a notched band that its centre frequency can be changed, a parasitic coupled line was added.…”

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Novel UWB BPF with a controllable notched band using hybrid structure

Xia

Liu

Lin

et al. 2017

IEICE Electron. Express

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In this letter, an ultra-wideband (UWB) bandpass filter (BPF) based on CPW-to-microstrip transition structure is proposed. To improve its selectivity, an interdigital coupled-line and split ring resonator (SRR) are used to generate two extra transmission zeros located at the lower and upper edge of the passband separately. The measured results show that the proposed filter possesses satisfactory performance such as compact size, sharp roll-off, and wide fractional bandwidth of 133% (2.35-11.75 GHz). Moreover, a notched band with deep attenuation introduced by coupling T-shaped short stub (CTSSS) is achieved to block the ITU8.0 band with centre frequency of 8.2 GHz. And the notched band is controllable. This filter can be a good candidate for ultra-wideband applications.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Novel UWB BPF with a controllable notched band using hybrid structure

Xia

Liu

Lin

et al. 2017

IEICE Electron. Express

View full text Add to dashboard Cite

show abstract

“…In [7], by using a microstrip line step-impedance resonator (SIR)'s first three resonant modes, a UWB BPF performance is realized. Although the frequency selectivity of this filter was poor due to that there was no transmission zeroes generated by the SIR, it introduced a new method into UWB BPF design, and many UWB filters have been presented following this idea [8,9,10].…”

Section: Introductionmentioning

confidence: 99%

A compact utral-wideband bandpass filter with broad stopband based on step-impedance stub-loaded tri-mode resonator

Yang

2017

IEICE Electron. Express

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A five-pole ultra-wideband (UWB) bandpass filter (BPF) with broad stopband for FCC UWB indoor communication application is developed. It employs a step-impedance stub-loaded tri-mode resonator, by properly selecting the impedance ratio of the stub, the proposed resonator is able to be downsized without changing significantly its tri-mode characteristics. The advantages of such resonator are easy control of its frequency response and highly compact in structure compared with other resonators. Moreover, a lowpass filter (LPF) is utilized to suppress the unwanted highfrequency harmonics of the proposed UWB BPF. Design and synthesis procedures with details are provided, and good agreement between simulated and measured results is also observed. Due to the fact that the introduced filter structure is simple and all the geometrical parameters are larger than 0.1 mm, the UWB BPF is feasible for low-cost fabrication using conventional printed circuit fabricating techniques.

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“…The half-wavelength parallel-coupled microstrip filter may be influenced by the spurious response at the 2f0, twice the passband frequency, which it reduces the attenuation of the stopband and affects the symmetry of the passband [4]. The quarter-wavelength resonator filters have the first spurious response at the 3f0, but they require shortcircuit connections with via holes, which are not quite compatible with planar fabrication techniques [5,6]. In order to overcome these drawbacks, the inverted microstrip combining different stepped impedance resonators with a specified coupling angle are presented in designing the bandpass filters [7,8].…”

Section: Introductionmentioning

confidence: 99%

Bandpass Filters using T-shape Stepped Impedance Resonators for Wide Harmonics Suppression and their Application for a Diplexer

Lerdwanittip¹,

Namsang²,

Akkaraekthalin³

2011

JSTS:Journal of Semiconductor Technology and Science

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Abstract-In this paper, the T-shape stepped impedance resonators are adopted for the design of microstrip bandpass filters for wide harmonics suppression. The proposed filters are operated at the center frequency of 2.44 GHz and 5.20 GHz, respectively. These bandpass filters have been also applied for a high performance diplexer. The insertion losses at the center frequencies of 2.44 and 5.20 GHz are 1.23 and 1.18, respectively. The applicable return losses for both frequency bands and a wide stopband better than 17 dB up to 20 GHz have been obtained.

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Band-notched ultra-wideband bandpass filter design using combined modified quarter-wavelength tri-section stepped-impedance resonator

Cited by 27 publications

References 12 publications

Novel UWB BPF with a controllable notched band using hybrid structure

Novel UWB BPF with a controllable notched band using hybrid structure

A compact utral-wideband bandpass filter with broad stopband based on step-impedance stub-loaded tri-mode resonator

Bandpass Filters using T-shape Stepped Impedance Resonators for Wide Harmonics Suppression and their Application for a Diplexer

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