Waveguide filter with improved stopband response using transversal slots

Mehrshahi, Esfandiar; Rezaiesarlak, Reza; Salehi, Mehdi

doi:10.1002/mmce.20510

Cited by 6 publications

(6 citation statements)

References 11 publications

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“…As the slot length increases, more attenuation of the second mode is achieved at the cost of the minor effect on passband ripple. By adjusting the length and width of the slots, their stopband responses are significantly improved [8]. Simulation results indicate that the stopband frequency response of the proposed filters of Figures 5 and 6 is affected by a minor frequency shift and in-band ripple.…”

Section: A Multishape Patterned Resonatorsmentioning

confidence: 81%

Spurious-response suppression of substrate integrated waveguide filters using multishape resonators and slotted plane structures

Salehi

Mehrshahi

2011

Int J RF and Microwave Comp Aid Eng

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This article introduces effective techniques to improve the stopband frequency response of substrate integrated waveguide filters. First, a filter is constructed by using different cavity resonators which resonate at the same fundamental mode but at different high-order modes. A cascade connection of circular and rectangular cavities is used to separate high-order modes, because the second resonant mode of the circular cavities is more than rectangular ones. Second, inserting transverse radiating slots at the proper positions of cavities, their second longitudinal resonant modes are shifted down and effectively rejected. Third, four cells of slotted plane structure (SPS) are adopted to the top plane of the both input and output feed lines of the filter to reject the undesired passbands or improve steepness of the filter. Also, a combination of the radiation slots with SPS is used to reject the spurious responses accompanied by sharp steepness of the filter. Comparing between the measurement values and simulation results verifies the effectiveness of the proposed configurations and the hybrid technique.

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Section: A Multishape Patterned Resonatorsmentioning

confidence: 81%

Spurious-response suppression of substrate integrated waveguide filters using multishape resonators and slotted plane structures

Salehi

Mehrshahi

2011

Int J RF and Microwave Comp Aid Eng

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“…In Table , the dimensions of the structure are shown. Following the filter design procedure in and compensating the lengths of the cavities by the capacitors, the frequency response of the filter is shown in Figure . The simulation is performed by HFSS.…”

Section: Filter Designmentioning

confidence: 99%

“…The simulation is performed by HFSS. To show the improvement of the results, the frequency response of the proposed filter is compared by the conventional inductive coupled filter . The center frequency of the filter is 9.6 GHz and its passband bandwidth is 800 MHz.…”

Section: Filter Designmentioning

confidence: 99%

Miniaturized waveguide filter with improved stop‐band response

Rezaiesarlak

Loghmannia

Salehi

2013

Micro & Optical Tech Letters

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In this article, a simple‐to‐design technique is presented to improve the out of band response as well as miniaturize the overall size of the waveguide filters. By appropriate coupling of capacitively loaded cavities resonating at the same fundamental frequency with different higher resonant modes, the out of band response of the filter is considerably improved. A third‐order filter is designed, simulated, and fabricated. The response of the proposed filter is compared with one from conventional third‐order inductive post filter. Good agreement between simulated and measured responses confirms the validity and accuracy of the design. © 2014 Wiley Periodicals, Inc. Microwave Opt Technol Lett 56:512–515, 2014

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“…However, the spurious resonances deteriorate the filter's stopband performance. To alleviate this, several approaches have been presented to improve the stopband performance in recent years [5,6,7,8,9,10,11,12,13,14,15,16,17,18,19]. For one possible approach, the spurious passband can be effectively suppressed by cascading the filter with a lowpass filter [5,6,7], however, this gives additional loss and size.…”

Section: Introductionmentioning

confidence: 99%

“…Another approach was focusing on the magnetic field features of the higher-order modes, where the couplings of higher-order modes were designed so that these higher-order modes can be effectively reduced [8,9,10]. As the 3 rd approach, slots can be added onto the resonators to radiate the undesired spurious resonances [11,12,13,14,15,16,17,18,19]. However, this may cause potential electromagnetic (EM) interference problems.…”

Section: Introductionmentioning

confidence: 99%