Compact low‐pass filters with deep and ultra‐wide stopband using tri‐ and quad‐mode resonators

Li, Qun; Zhang, Yonghong; Li, Daotong; Xu, Kai‐Da

doi:10.1049/iet-map.2016.0466

Cited by 18 publications

(9 citation statements)

References 17 publications

(20 reference statements)

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“…where, f u =upper stopband, f l =lower stopband The substrate loss tangent has greater impact on the stopband performance of the LPF. The LPF of [12,15,18,20,22] uses costly substrate with low loss tangent compared to the proposed work. The proposed work has better relative stop bandwidth (RSB) than [20, 21 and 22] and better stopband suppression than [12 and 19].…”

Section: Resultsmentioning

confidence: 99%

“…1(b). The parameters for coupled lines are extracted using the equation given in [22]. The open stub is visualised as a patch resonator with its feeding position at l6.…”

Section: Design Methodologymentioning

confidence: 99%

“…In [19], a low cost LPF (using dielectric substrate FR4) was proposed, but the suppression in stopband was unsatisfactory. In [20][21][22], resonator and open-stub was used in LPF to achieve wide stopband, but the circuit size was enhanced.…”

Section: Introductionmentioning

confidence: 99%

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Design of a cheap compact low-pass filter with wide stopband

Bhowmik¹,

Moyra²

2018

AMA_C

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In these work, a cheap and compact Low-Pass filter (LPF) with wide stopband is designed using modified hairpin resonator. The first transmission zero is obtained from the transfer function (TF) analysis of the hairpin resonator. Further, open stubs are added to widen the stopband. An approximate LC equivalent circuit of the proposed structure is derived and the response is in accord with simulated result. A prototype of the proposed LPF is fabricated on FR4 substrate. The proposed LPF has-3 dB cutoff frequency at 1.1 GHz with wide stopband ranging from 1.6 GHz to 11.5 GHz. The size occupied by the proposed LPF is 15.8 mm x 14.3 mm. In the passband region, the insertion loss is-0.3 dB and return loss is better than-25 dB. The proposed LPF is measured and there is a good agreement between the simulated and measured results.

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Section: Resultsmentioning

confidence: 99%

“…1(b). The parameters for coupled lines are extracted using the equation given in [22]. The open stub is visualised as a patch resonator with its feeding position at l6.…”

Section: Design Methodologymentioning

confidence: 99%

See 1 more Smart Citation

Design of a cheap compact low-pass filter with wide stopband

Bhowmik¹,

Moyra²

2018

AMA_C

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“…Owing to the excellent properties, such as low profile and cost, compact size, and easy integration with other devices, the microstrip filters are extensively used in the wireless and telecommunication systems including 4G, WiFi and sensing radars. To satisfy various requirements, the microstrip filters with individual characteristics have been designed, including low-pass filters [1,2], balanced bandpass filters (BPFs) [3,4], reconfigurable dual-band BPFs [5,6], and stopband filters [7,8], respectively.…”

Section: Introductionmentioning

confidence: 99%

Wideband bandpass filters with reconfigurable bandwidth and fixed notch bands based on terminated cross‐shaped resonator

Cheng

Cheong

et al. 2019

IET Microwaves, Antennas & Propagation

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In this study, a series of wideband bandpass filters (BPFs) with reconfigurable bandwidth and two fixed notch bands are presented. The fundamental topology is based on a new terminated cross‐shaped resonator (TCSR), which has three poles and four zeros. With the assistance of two symmetrical parallel coupled‐lines, another four poles and two zeros are introduced. As such, a notched‐band bandpass filter with multiple transmission poles and zeros are achieved. To realise the reconfigurable bandwidth, four PIN diodes are used. By controlling the status (switching on/off) of these PIN diodes, three reconfigurable‐bandwidth states can be implemented while the notch bands and centre frequency are maintained unaltered. Meanwhile, it is also found that the lower bandwidth edge of the proposed filter can be independently reconfigurable by inserting a capacitor into the lower stub of the novel TCSR, while the notch bands are kept unchanged. For validation, three prototypes are designed, fabricated, and measured. The measured results agree well with theoretical analysis and therefore verify the simple designing approach of reconfigurable BPFs.

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“…The filter achieves 34.9 GHz stopband (from 5.1 GHz to 40.0 GHz). In [19], a low pass filter consisting of two unequally sized pairs of quad-mode resonators is presented, and each resonator consists of a folded half-wavelength resonator and three parallel open stubs. The quad-mode resonators filter achieves 18.3 GHz stopband (from 3.1 GHz to 21.4 GHz).…”

Section: Introductionmentioning

confidence: 99%

Modified CMRC LPF Using Novel Fractal Patches

Yassin¹,

Mohamed²,

Abdallah³

et al. 2018

PIER Letters

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A modified compact microstrip resonance cell (CMRC) low pass filter (LPF) with ultrawide and deep stopband using novel fractal patches is presented. The proposed filter has a low insertion loss in the passband, good selectivity, ultrawide and deep stopband. The experimental results show a 3-dB cutoff frequency of 2.85 GHz and out-of-band rejection up to 67 GHz with 181.5% relative stopband bandwidth Low pass microstrip filters, ultrawide band, compact microstrip resonance cell (CMRC), fractal.

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Compact low‐pass filters with deep and ultra‐wide stopband using tri‐ and quad‐mode resonators

Cited by 18 publications

References 17 publications

Design of a cheap compact low-pass filter with wide stopband

Design of a cheap compact low-pass filter with wide stopband

Wideband bandpass filters with reconfigurable bandwidth and fixed notch bands based on terminated cross‐shaped resonator

Modified CMRC LPF Using Novel Fractal Patches

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