Asymmetric response dual-mode dual-band bandstop filters having simple and understandable topology

Karpuz, Ceyhun; Görür, Adnan; Gunturkun, Elif; Görür, Ali Kürşad

doi:10.1109/apmc.2009.5384319

Cited by 12 publications

(6 citation statements)

References 11 publications

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“…More and more DBSFs have been proposed. [1][2][3][4][5][6][7][8][9][10][11][12][13][14][15][16][17][18] The filter proposed in Reference [1] adds a passband within the stopband to form a basic dual-band bandstop filter, but each stopband has only one transmission zero (TZ), and there are no extra transmission poles (TPs) next to the stopband to form sharp selectivity. And the 3-dB fractional bandwidths (FBWs) of the stopbands are very narrow.…”

Section: Introductionmentioning

confidence: 99%

“…For a bandstop filter, the performance of the passbands directly determines the filtering effect of the filter. The filters proposed in References [5][6][7][8][9][10] optimize the performance of each passband to a great extent by adding TPs outside the stopbands to improve the selectivity, but the 3-dB FBWs of the stopbands are too narrow. References [11][12][13] propose filters that consist of hybrid SAW/lumped-element resonators, and miniaturized substrate-integrated-coaxial resonant stages that are made from two capacitively loaded posts and a thru-line.…”

Section: Introductionmentioning

confidence: 99%

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Broadband dual‐band bandstop filters based on step‐impedance stubs and transmission‐line networks

et al. 2022

Int J RF Mic Comp-Aid Eng

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In this paper, a novel basic structure of a dual-band bandstop filter (DBSF) without coupled lines is proposed. In order to improve the performance, some optimizations are made to the basic structure, and two DBSF structures with multi-transmission zeros and multi-transmission poles are obtained. These filters have the advantages of simple structure, high selectivity, and high stopband rejection, among which the deepest stopband can be better than 45 dB.In addition, an extraction method of transmission zeros and transmission poles based on the S-parameter theory is proposed. The ideal 3-dB fractional bandwidths of the basic structure are 37.8% and 18.7%, respectively, 54.1% and 25.9% for the first improved structure, respectively, and 75.1% and 34.2% for the second improved structure, respectively. EM simulation results and measured results are highly unified to verify the proposed filter structure.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Broadband dual‐band bandstop filters based on step‐impedance stubs and transmission‐line networks

et al. 2022

Int J RF Mic Comp-Aid Eng

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“…To date, multiband microstrip bandstop filters have been introduced in many approaches including composite resonators [1], open loop resonators [2], dual-mode loop resonators [3], stub loaded resonators [4], etc.. Additionally, hairpin resonators are not only used for microstrip bandstop filter design, but also used for any kind of microstrip filter design. Stepped impedance hairpin resonators are used to design compact and high performance lowpass filters in [5,6].…”

Section: Introductionmentioning

confidence: 99%

A Novel Dual-Band Microstrip Bandstop Filter Based on Stepped Impedance Hairpin Resonators

Dzhumamuhambetov¹,

Abykanova²,

Gorur³

2019

PIER Letters

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In this paper, design of a novel dual-band microstrip bandstop filter is presented. The designed filter is constructed by loading two stepped impedance hairpin resonators to a simple straight transmission line, which also connects to the input and output ports. By virtue of the proposed resonator, the ratio of the first and second resonance frequencies can be obtained as approximately 4.4. Two stopbands centered at 2.34 GHz and 7.81 GHz with the fractional bandwidths of 33.2% and 7.9% can be obtained, respectively. Rejection levels inside the stopbands are better than 20 dB. Total electrical length of the proposed filter is 0.317λ g × 0.136λ g , where λ g is the guided wavelength at the lowest resonance frequency. The designed filter was also fabricated and tested for experimental verification. The measured results are in an excellent agreement with the simulated ones.

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“…In this article, a novel dual‐mode dual‐band bandstop filter with independently tunable center frequencies is designed. The designed filter is constructed by coupling two dual‐mode square loop resonators in different electrical lengths to a straight transmission line which connects input and output ports in a similar approach with . The proposed resonators have three varactor diodes used instead of perturbation and reference capacitors.…”

Section: Introductionmentioning

confidence: 99%

Dual‐mode dual‐band microstrip bandstop filter design with independently tunable center frequencies

Görür

Basmaci

Doğan

et al. 2017

Micro & Optical Tech Letters

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In this article, a novel dual‐mode dual‐band bandstop filter design with independently tunable center frequencies is presented by using dual‐mode square loop resonators. Tuning operation can be achieved with a constant fractional bandwidth. Varactor diodes are used instead of perturbation and reference elements. Two dual‐mode square loop resonators in different electrical lengths are coupled to a transmission line connecting input and output ports. Center frequencies of both stopbands can be independently tuned by changing the capacitances of varactor diodes of both perturbation and reference elements. While the perturbation and reference varactors tune even mode resonance frequency together, odd mode resonance frequency can only be tuned by reference varactors. The designed filter was also fabricated for the experimental studies and it exhibits acceptable tunability operations in measurements. Center frequencies of the first and second stopbands can be tuned between 2.2 and 2.54 GHz and between 3 and 3.38 GHz, respectively. Rejection levels for both stopbands were obtained as better than −13 dB in the whole tuning range.

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Asymmetric response dual-mode dual-band bandstop filters having simple and understandable topology

Cited by 12 publications

References 11 publications

Broadband dual‐band bandstop filters based on step‐impedance stubs and transmission‐line networks

Broadband dual‐band bandstop filters based on step‐impedance stubs and transmission‐line networks

A Novel Dual-Band Microstrip Bandstop Filter Based on Stepped Impedance Hairpin Resonators

Dual‐mode dual‐band microstrip bandstop filter design with independently tunable center frequencies

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