An Alternate Circuit for Narrow-Bandpass Elliptic Microstrip Filter Design

Chen, Sen; Shi, Ling‐Feng; Xun, Jian‐Hui

doi:10.1109/lmwc.2017.2711528

Cited by 25 publications

(7 citation statements)

References 12 publications

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“…For three-layer frequency, selective surface minkowski fractal islands are applied to reduce the size and improve bandwidth using a novel approach in [6], which is large in dimensions. A serial resonator and a parallel resonator are connected as shunt branches and analyzed using the elliptic function to design a bandpass filter in [13], which results in low FBW. Differential structure based on analytical approach is used to design narrow bandpass microstrip filter in [14], which results in high insertion loss.…”

Section: Introductionmentioning

confidence: 99%

Design of C band Bandpass Filter using Fractal based Symmetrical Ring Resonator

Sowjanya

Vakula

2022

AEM

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Symmetrical ring resonator metamaterial along with fractal boundary is proposed for Band Pass Filter (BPF) design in this paper. A combination of symmetrical ring resonators and vias is used for designing a bandpass filter. Bandpass filter with low insertion loss, better fractional bandwidth even at higher frequencies is achieved by using moore fractal applied symmetrical ring metamaterial resonators along the microstrip transmission line. The operating frequency range of the simulated filter is in the C-band between 5.47 GHz - 6 GHz having fractional bandwidth (FBW) of 9.25% and with a minimum insertion loss of 1.2 dB. Application of moore fractal to the above implementation improved the bandwidth of the filter. Fractal applied symmetrical ring resonator simulated filter operates in the C-band between 7.15 GHz - 8.15 GHz having FBW of 13%, with a minimum insertion loss of 1 dB. The proposed filter is simulated, fabricated and S-parameters are measured using network analyzer N5222A. S-parameters results of fractal applied symmetrical ring resonator filter realized from simulations match closely with those from measurements results performed on prototypes but with a small shift in a frequency range. The measured filter operates in 6.95 GHz - 7.8 GHz having FBW of 11.5%, with a minimum insertion loss of 0.4 dB.

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Section: Introductionmentioning

confidence: 99%

Design of C band Bandpass Filter using Fractal based Symmetrical Ring Resonator

Sowjanya

Vakula

2022

AEM

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“…An absorptive band stop filter can be realized using two quadruple couplers and band pass filters [23]. The circuit implementation of narrow band pass, elliptic and microstrip filters was presented in [24] and can be used to realize band pass filters at 2 GHz [25]. The design of an open-loop resonator based filter antenna for Wi-Fi applications is presented in [26,27].…”

Section: Introductionmentioning

confidence: 99%

Development of a Microwave Sensor for Solid and Liquid Substances Based on Closed Loop Resonator

Aiswarya

Menon

Donelli

et al. 2021

Sensors

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In this work, a compact dielectric sensor for the detection of adulteration in solid and liquid samples using planar resonators is presented. Six types of filter prototypes operating at 2.4 GHz are presented, optimized, numerically assessed, fabricated and experimentally validated. The obtained experimental results provided an error less than 6% with respect to the simulated results. Moreover, a size reduction of about 69% was achieved for the band stop filter and a 75% reduction for band pass filter compared to standard sensors realized using open/short circuited stub microstrip lines. From the designed filters, the miniaturised filter with Q of 95 at 2.4 GHz and size of 35 mm × 35 mm is formulated as a sensor and is validated theoretically and experimentally. The designed sensor shows better sensitivity, and it depends upon the dielectric property of the sample to be tested. Simulation and experimental validation of the designed sensor is carried out by loading different samples onto the sensor. The adulteration detection of various food samples using the designed sensor is experimentally validated and shows excellent sensing on adding adulterants to the original sample. The sensitivity of the sensor is analyzed by studying the variations in resonant frequency, scattering parameters, phase and Q factor with variation in the dielectric property of the sample loaded onto the sensor.

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“…Therefore, most miniaturization techniques cannot be implemented using elliptic filtering functions. Elliptic filters are well-established, but unfortunately, the sensitivity of the filters to the manufacturing tolerance has not been addressed in recent studies [12][13][14][15][16][17][18]. In the upcoming years, the need for a filter with a low sensitivity to the manufacturing tolerance will grow drastically due to the rapid deployment of 5G communication.…”

Section: Introductionmentioning

confidence: 99%

Synthesis of Chained-Elliptic Function Waveguide Bandpass Filter With High Rejection

Ng¹,

Cheab²,

Wong³

et al. 2020

PIER C

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This paper describes the synthesis of a bandpass filter to achieve high selectivity and rejection properties using a new class of filter functions called chained-elliptic function filters. Chainedelliptic filters have higher selectivity than Chebyshev function filters and have the property of sensitivity to manufacturing tolerance reduction in chained-function filters. The proposed design has high selectivity and reduced sensitivity, enabling easier and faster filter fabrication. The characteristic polynomials of chained-elliptic function filters are derived (through chaining elliptic filtering function) and extracted to form a coupling matrix of the bandpass filter. The novel transfer polynomials are given in detail, and a thorough investigation of the filter characteristics is performed. A theoretical comparison with Chebyshev and elliptic filters of the same order is performed to ascertain the demonstrated advantages of this proposed filter class. A high frequency narrow-band fourth-order chained-elliptic function waveguide filter centred at 28 GHz with a fractional bandwidth of 1.61% is fabricated to validate the proposed design concept. A good match among the measured, simulated, and ideal filter responses is shown where the overall responses between measurement and simulation have a difference of approximately 2% which is within the acceptable limit. The chained-elliptic function concept will be useful in designing low-cost high-performance microwave filters with various fabrication technologies for millimetre-wave applications.

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An Alternate Circuit for Narrow-Bandpass Elliptic Microstrip Filter Design

Cited by 25 publications

References 12 publications

Design of C band Bandpass Filter using Fractal based Symmetrical Ring Resonator

Design of C band Bandpass Filter using Fractal based Symmetrical Ring Resonator

Development of a Microwave Sensor for Solid and Liquid Substances Based on Closed Loop Resonator

Synthesis of Chained-Elliptic Function Waveguide Bandpass Filter With High Rejection

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