High performance LPF Structure with sharp roll‐off and low VSWR

Mousavi, Seyed Mohammad Hadi; Makki, Seyed Vahab Al‐Din; Hooshangi, Sh.; Alirezaee, Sh.; Siahkamari, Hesam; Ahmadi, M.

doi:10.1049/el.2015.2329

Cited by 10 publications

(9 citation statements)

References 8 publications

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“…It should be noted that no experimental or simulation validation for group delay is provided in Refs. .…”

Section: Resultsmentioning

confidence: 99%

“…Compact size, negligible losses (insertion and return loss), high roll‐off rate and wide stopband are considered as the most efficient factors in LPFs designing. Numerous structures of LPFs have been proposed and analyzed in order to enhance these features . Using hairpin resonators and rhombic stubs, two LPFs were suggested in Refs., respectively, but both of them suffer from gradual transition bands.…”

Section: Introductionmentioning

confidence: 99%

“…Using two identical butterfly resonators, an LPF with high FOM was proposed in Ref. , albeit its structure was complex. In Ref.…”

Section: Introductionmentioning

confidence: 99%

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High performance LPF with negligible group delay using circular resonator and transfer function analysis

Rahmatinezhad

Makki

Mousavi

2019

Micro & Optical Tech Letters

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Using circular and rectangular resonators, a new design of a compact microstrip lowpass filter (LPF) with negligible losses is proposed and fabricated. The proposed LPF has a 3 dB cut-off frequency at 1.375 GHz with an adjusting range of 14.5%; moreover, the suggested configuration leads to a competitive roll-off rate of 189 dB/ GHz and a negligible group delay of 0.47 ns. Attenuator cells have capability to produce numerous transmission zeros (TZs) at high frequencies; consequently, an ultra-wide stopband (14 f c ) with high suppression level (25 dB) is successfully obtained. Furthermore, the LPF has a small size of 0.067λ g × 0.134λ g (λ g is the guided wavelength at 1.375 GHz). The transfer function is also calculated to adjust the location of the main TZs and the cut-off frequency. Finally, an acceptable similarity between the simulated results and the tested ones verifies the simulation results. K E Y W O R D Scircular resonator, group delay, lowpass filter, selectivity

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“…It should be noted that no experimental or simulation validation for group delay is provided in Refs. .…”

Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

High performance LPF with negligible group delay using circular resonator and transfer function analysis

Rahmatinezhad

Makki

Mousavi

2019

Micro & Optical Tech Letters

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“…To provide a compact LPF, Complementary split-ring resonator (CSRR) was used [10], however, the stopband was narrow with degraded passband performance. For better suppression in the stopband, resonating patches are used [11][12][13][14][15][16][17][18][19]. In [11,12] the use of resonating patches widened the stopband at the cost of suppression in stopband.…”

Section: Introductionmentioning

confidence: 99%

“…In [13][14][15] wide stopband is accomplished due to addition of multiple stub, resulting in an increase in size. Use of multiple stub in LPF [16] accomplishes sharp roll off, but increased the size and degraded the stopband performance. In [17] wideband suppression is achieved by putting three resonators, which results in increase in size.…”

Section: Introductionmentioning

confidence: 99%

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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Design and fabrication of a miniaturized Gysel power divider using improved T‐shaped resonator

Pahlavani

Moradkhani

Sayadi

2022

Micro & Optical Tech Letters

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A high-performance Gysel power divider showcasing high suppression factor and low insertion loss at 540 MHz has been designed, investigated, and fabricated in this paper. The proposed Gysel power divider is made up of replacing six identical resonators with conventional transmission lines. The proposed resonators, which have been analyzed using LC equivalent circuit analysis, are designed to have a small size, low insertion loss, wide stopband, and narrow transition band. The final tested results have indicated that the suggested power divider is able to suppress nine harmonics; moreover, it has only an insertion loss of 0.4 dB. Another positive feature of the power divider is its small size in comparison with a conventional power divider at this operating frequency, where it occupies 34.5 × 63.8 mm 2 equaling to 0.188 × 0.102 λ g 2 , where λ g is the wavelength guide at 540 MHz. This figure is 25% of a conventional Gysel, considered as a remarkable point.

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High performance LPF Structure with sharp roll‐off and low VSWR

Cited by 10 publications

References 8 publications

High performance LPF with negligible group delay using circular resonator and transfer function analysis

High performance LPF with negligible group delay using circular resonator and transfer function analysis

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

Design and fabrication of a miniaturized Gysel power divider using improved T‐shaped resonator

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