Compact and Wide Stopband Bandpass Filters Based on Dual-Mode Folded Circular Substrate Integrated Waveguide Cavities

Zhu, Fang; Wu, Yunfei; Chu, Peng; Luo, Guo Qing; Wu, Ke

doi:10.1109/tmtt.2023.3238462

Cited by 19 publications

(13 citation statements)

References 35 publications

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“…Taking advantage of above characteristic, the FSPR can be utilised to design a dual‐mode filter with controllable bandwidth. Specifically, choosing central angle θ close to the crossing point ( θ = 58°) leads to a narrowband filter, whereas increasing the distance from the crossing point allows for larger passband width [23]. Thus, the proposed dual‐mode fan‐shape patch resonator can realise two controllable non‐degenerate modes through the adjustment of central angle θ rather than adding extra perturbations.…”

Section: Two‐pole Filter Based On One Dual‐mode Cavitymentioning

confidence: 99%

“…On the contrary, the odd symmetric distribution of the electric field of the TM 110 mode leads to the coupling coefficient M S1 and M L1 with opposite signs (i.e. M S1 = − M L1 ) [23]. As shown in the Figure 4b, the node N represents the non‐resonant mode TM 010 or other higher‐order modes, which are coupled to the source and load respectively.…”

Section: Two‐pole Filter Based On One Dual‐mode Cavitymentioning

confidence: 99%

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Highly‐selective microstrip bandpass filters based on new dual‐mode fan‐shape patch resonators

Fan

Гонг

Liu

et al. 2023

IET Microwaves Antenna & Prop

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A design method for highly‐selective bandpass filters based on novel dual‐mode fan‐shaped patch resonator (FSPR) is presented in this article. Different from traditional dual‐mode patch filters, two higher‐order modes TM020 and TM110 are utilised to generate a passband, and the two resonant frequencies can be controlled well by its radius and angle. A dual‐mode filter with two transmission zeros (TZs) is implemented by using one FSPR, and locations of TZs can be controlled well. To further improve the selectivity of FSPR filters, four‐pole filters based on two identical dual‐mode FSPRs with co‐directional and reverse‐directional cascade are simulated, fabricated and measured. Furthermore, three‐ and four‐pole filters based on dual‐mode FSPR and single‐mode uniform impedance resonators are proposed, which are also simulated, fabricated, and measured. The later proposed filters not only achieve high selectivity and wide stopband, but also have simple structure and small size.

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Section: Two‐pole Filter Based On One Dual‐mode Cavitymentioning

confidence: 99%

Section: Two‐pole Filter Based On One Dual‐mode Cavitymentioning

confidence: 99%

Highly‐selective microstrip bandpass filters based on new dual‐mode fan‐shape patch resonators

Fan

Гонг

Liu

et al. 2023

IET Microwaves Antenna & Prop

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show abstract

“…Bandpass filter plays an important role in wireless communication systems. There are many different technologies to implement bandpass filter, such as microstrip, [1][2][3] stripline, 4 substrate integrated waveguides (SIW), [5][6][7] metal rectangular waveguide, 8,9 substrate-integrated-suspended-line (SISL), [10][11][12] and so on. The reconfigurable technology in the bandpass filter is one of the key research contents.…”

Section: Introductionmentioning

confidence: 99%

Novel FR4‐based low loss reconfigurable filter with four operating modes using movable transmission lines

Wang,

Jiang,

Wang

2024

Micro & Optical Tech Letters

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In the letter, a novel reconfigurable filter using movable transmission lines is proposed. The filter is based on substrate‐integrated‐suspended‐line structure with two inner layers, fabricated on low‐cost FR4 substrate. The suspension line and the cavity are completely covered by copper. The suspension line could be freely moved in the air cavity. In the novel structure, the coupled lines have a variable coupling coefficient. With the movements of two transmission lines, the filter has four operating modes and can be tuned, with low insertion loss of less than 0.45 dB, showing promising properties.

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“…However, conventional SIW cavities often occupy a considerable amount of space, especially at lower microwave frequencies. Thus, reducing the size of SIW cavities is one of the current research focuses for SIW filters 4–9 . Compared with traditional SIW structure, folded SIW configuration can achieve 50% reduction in the horizontal size of the filter 4,5 .…”

Section: Introductionmentioning

confidence: 99%

“…Thus, reducing the size of SIW cavities is one of the current research focuses for SIW filters 4–9 . Compared with traditional SIW structure, folded SIW configuration can achieve 50% reduction in the horizontal size of the filter 4,5 . By bisecting the complete SIW cavity along the virtual magnetic walls, it is possible to achieve various configurations, such as half‐mode SIW (HMSIW), quarter‐mode SIW (QMSIW), and eighth‐mode SIW (EMSIW) 6–9 .…”

Section: Introductionmentioning

confidence: 99%

Compact dual‐band bandpass filter based on EMSICC and CPW resonator with excellent design flexibility

Fang,

Guan,

Ren

et al. 2023

Micro & Optical Tech Letters

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In this letter, a novel dual‐band bandpass filter (BPF) with independently controllable center frequencies, bandwidths, and transmission zeros (TZs) is presented. The proposed BPF is realized by using eighth‐mode substrate‐integrated circular cavities (EMSICCs) and coplanar waveguide (CPW) resonators. The CPW resonators are embedded in the upper surface of the EMSICCs, allowing for a compact size without additional circuit dimensions. Finally, a dual‐band BPF for WLAN is designed and fabricated with center frequencies of 2.45 and 5.2 GHz. The measured results closely align with the simulated ones, validating the performance of the filter. Multiple TZs are generated by cross‐coupling and source‐load coupling, which results in good out‐of‐band rejection performance.

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Compact and Wide Stopband Bandpass Filters Based on Dual-Mode Folded Circular Substrate Integrated Waveguide Cavities

Cited by 19 publications

References 35 publications

Highly‐selective microstrip bandpass filters based on new dual‐mode fan‐shape patch resonators

Highly‐selective microstrip bandpass filters based on new dual‐mode fan‐shape patch resonators

Novel FR4‐based low loss reconfigurable filter with four operating modes using movable transmission lines

Compact dual‐band bandpass filter based on EMSICC and CPW resonator with excellent design flexibility

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