Vertical Response Microstrip Lowpass Filter Using Stepped Impedance Lines and Radial Resonators

Mousavi, Seyed Mohammad Hadi; Makki, Seyed Vahab Al‐Din; Raziani, Saeed; Siahkamari, Hesam; Malakooti, Seyed-Ali

doi:10.1007/s11277-017-4527-2

Cited by 5 publications

(5 citation statements)

References 17 publications

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“…To calculate the transfer function, the LC-equivalent circuit is divided to three parts, as shown in Figure 5a. In part 1, C e3 and L e3 are the series and corresponding impedance of part 1, calculated in Equation (9).…”

Section: Zpart1 = (9)mentioning

confidence: 99%

“…In [6], an ultra-wide stopband LPF is designed with a sharp response, but this filter has a complicated structure. Stepped-impedance structures, open tubs and radial-shaped resonators have widely been used in designing microstrip filters, particularly lowpass filters with a large stopband [7][8][9]. Square split-ring resonators are used to shape a small microstrip LPF with a new structure in [10], but this filter suffers from high insertion loss in pass-band.…”

Section: Introductionmentioning

confidence: 99%

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Half-Elliptical Resonator Lowpass Filter with a Wide Stopband for Low Band 5G Communication Systems

et al. 2021

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In this paper, a lowpass filter is designed using half elliptical resonators with a wide stopband. New formulas are presented to achieve a circuit model for the half elliptical resonators used in this work. Additionally, the transfer function and transmission zero equations are used to adjust the frequency of the transmission zeros of the filter. The cut-off frequency of the lowpass filter is 1.26 GHz with a sufficiently large stopband, extending from 1.48 GHz to 20 GHz. The proposed filter’s figure of merit is 62,520, demonstrating its outperformance compared to the state of the art. The filter is implemented on a RT-5880 substrate with a constant dielectric of 2.2, thickness of 31 mil and loss tangent of 0.0009. The LPF was fabricated and tested, showing good agreement between the simulated and measured results.

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Section: Zpart1 = (9)mentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Half-Elliptical Resonator Lowpass Filter with a Wide Stopband for Low Band 5G Communication Systems

et al. 2021

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“…A folded stepped impedance stub (FSIS) matching 50 Ω is used as input transmission lines to achieve a better impedance matching 23,24 . The equivalent LC circuit of the proposed FSIS was reported in somewhere else 25 . It is indicated that after FSIS replaces the transmission line, it will affect the equivalent circuit of the entire antenna.…”

Section: Antenna Designmentioning

confidence: 99%

“…23,24 The equivalent LC circuit of the proposed FSIS was reported in somewhere else. 25 It is indicated that after FSIS replaces the transmission line, it will affect the equivalent circuit of the entire antenna. As a result, it will optimize the impedance matching and change the resonance frequency.…”

Section: Design Theory Of the Proposed Antenna Unitmentioning

confidence: 99%

A high performance UWB MIMO antenna with defected ground structure and U‐shape branches

Tang

Yao

et al. 2020

Int J RF Microw Comput Aided Eng

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A binary ultra‐wideband multiple‐input‐multiple‐output (MIMO) antenna is proposed and fabricated. In order to increase the impedance bandwidth and resonance frequency, U‐shaped branches, defected ground structure, folded stepped impedance stubs, and window‐shaped radiation patch slots are analyzed. The total size of the MIMO antenna is 80 mm × 35 mm, and the measured relative impedance bandwidth realizes 131% (2.57‐12.2 GHz). Without the addition of a decoupling structure and a metal isolation bar, the isolation measured by this work is less than −15 dB. The measured antenna gain is between 3.064 and 4.669 dBi. The measured envelope correlation coefficient value is less than 0.005, and diversity gain is almost equal to 10 dB. The channel capacity loss obtained in the measurement is less than 0.4 bit/s/Hz in the bandwidth except for 9 to 10 GHz. Excellent properties make it suitable for modern wireless communication applications.

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“…In the last decade, researchers have concentrated on using bandpass filters [8][9][10][11][12][13] and lowpass filters [14][15][16][17][18][19][20][21] as an effective method to produce a high-performance Gysel power divider. In refs.…”

Section: Introductionmentioning

confidence: 99%

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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Vertical Response Microstrip Lowpass Filter Using Stepped Impedance Lines and Radial Resonators

Cited by 5 publications

References 17 publications

Half-Elliptical Resonator Lowpass Filter with a Wide Stopband for Low Band 5G Communication Systems

Half-Elliptical Resonator Lowpass Filter with a Wide Stopband for Low Band 5G Communication Systems

A high performance UWB MIMO antenna with defected ground structure and U‐shape branches

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

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