A Design Method of Multimode Multiband Bandpass Filters

Ma, Pengyu; Wei, Bin; Hong, Jia-Sheng; Xu, Zhan; Guo, Xubo; Cao, Bisong; Jiang, Linan

doi:10.1109/tmtt.2018.2815682

Cited by 27 publications

(17 citation statements)

References 32 publications

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“…A tri-band resonator consists in one bandpass element, i.e., a short-circuit stub of length λ/4 at ω 0 , and two stopband ones consisting of a short-circuit stub of length λ/4 at ω 1 and ω 2 , respectively, and separated from the connection point by another quarter-wavelength line at the same respective frequency having the J-inverter role. Compared with the method described in [30], our proposal allows a direct determination of the values of circuit elements from the transformation formulas. For implementation, as mentioned in Section III, we have chosen suitable values to avoid too narrow (less than 0.1 mm) or too wide (more than 4 mm) linewidth.…”

Section: A Triple-band Bandpass Filtersmentioning

confidence: 99%

“…Similar techniques were used to design dual-and triple-band bandpass filters in [28] and [29] with different implementation topologies and technologies. In [30], the authors also applied the frequency transformation approach to design triple-band bandpass filter. Additional transmission zeros were realized before each bandpass using optimized multimode resonators.…”

Section: Introductionmentioning

confidence: 99%

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Direct Synthesis of Multiband Bandpass Filters With Generalized Frequency Transformation Methods

Fourn

Besnier

et al. 2021

IEEE Trans. Microwave Theory Techn.

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Section: A Triple-band Bandpass Filtersmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Direct Synthesis of Multiband Bandpass Filters With Generalized Frequency Transformation Methods

Fourn

Besnier

et al. 2021

IEEE Trans. Microwave Theory Techn.

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“…A general design method for multiband filters is proposed in [2]. In [2], the frequency and element transformations from a low-pass prototype filter to a practical multiband bandpass filter is derived, and the formula which extracts the coupling coefficient k between coupled multimode resonators and the external quality factor are obtained. A novel method to design low loss dual-band microstrip filters using folded open-loop ring resonators (OLRRs) is presented in [3].…”

Section: Motivation and Related Workmentioning

confidence: 99%

“…For this BPF, L (2) x , L (4) x and L (5) x are chosen as shortedstubs, and the other stubs are opened-stubs. Whether the stub is chosen to be opened-or shorted-stub can be achieved by setting a flag bit x (n) and we randomly generate it in the design procedure.…”

Section: Frequency Band [Ghz]mentioning

confidence: 99%

A Novel Method to Design Stub-loaded Microstrip Filters with Arbitrary Passband Based on the Reflection Theory and Monte Carlo Method

H.¹,

Yuan²,

Yuan³

2019

RADIOENGINEERING

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In this paper, a novel method to design microstrip filters with arbitrary passband is proposed. A kind of stubloaded microstrip filter with asymmetric structure is proposed in this paper. The mathematic function of the total reflection coefficient at the input port of the filter is derived based on the reflection theory, and an ultra-wide-band (UWB) filter which can work from 11 GHz to 39 GHz is fabricated and measured to verify that our function can calculate the reflection coefficient precisely. The circuit model of this UWB filter is provided, and the comparison between frequency responses of the circuit simulation and the calculation results justifies the validity of our proposed method. The procedure based on the Monte Carlo method to design stub-loaded microstrip filters with arbitrary passbands is given in this paper. A bandpass filter (BPF) which can work on 7-9.5 GHz is designed and measured as an example. The comparison between calculated dimensions and practical dimensions of this filter shows a satisfactory fitting degree. Then the proposed method is compared with the Chebyshev filter design method to show the advantages of our proposed method. A low-pass filter (LPF) which can work below 4 GHz is designed and compared with some prior arts in order to show that our proposed filter is simple in structure and small in size. At last, the adaptabilities of our proposed method in narrow band and multi-band situations are discussed in this paper. By using our proposed method, the stub-loaded microstrip filter can be designed quickly and easily. Based on the results mentioned above, we can count that the method proposed in this paper has a good application in microstrip filter design.[30] DONG, X. M., ZHOU, D. X. Learning gradients by a gradient descent algorithm. His research interests include microwave circuits design, wireless communication and wave propagation.

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“…The design of compact filters that operate at two independent frequencies and exhibit independently controlled bandwidths still remains a challenge. Different dual-band filter topologies have been recently proposed based on different synthesis techniques such as dual-band frequency transformation [1], filters based on dual-mode resonators [2], stepped impedance resonators [3], etc.…”

Section: Introductionmentioning

confidence: 99%

Compact left-handed dual-band filters based on shundted stub resonators

Radonić

Crnojević‐Bengin

2019

FACTA U EE

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In this paper, super-compact microstrip dual-band resonator is presented, designed using the superposition of two simple left-handed (LH) resonators with single shunt stub. The proposed resonator exhibits spurious response in wide frequency range and therefore allows construction of dual-band filters using the superposition principle. The equivalent circuit model of the proposed resonator is crated and the influence of different geometrical parameters to the performances of the resonator are analyzed in details. As an examples, two dual-band filters that operate simultaneously at the WiMAX frequency bands are designed.

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A Design Method of Multimode Multiband Bandpass Filters

Cited by 27 publications

References 32 publications

Direct Synthesis of Multiband Bandpass Filters With Generalized Frequency Transformation Methods

Direct Synthesis of Multiband Bandpass Filters With Generalized Frequency Transformation Methods

A Novel Method to Design Stub-loaded Microstrip Filters with Arbitrary Passband Based on the Reflection Theory and Monte Carlo Method

Compact left-handed dual-band filters based on shundted stub resonators

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