Millimeter‐wave substrate integrated waveguide bandpass filters based on stepped‐impedance
            <scp>E</scp>
            ‐shaped defected ground structure
            <scp>s</scp>

Li, Jian; Zheng, Wei; Wei, Xueming

doi:10.1002/mmce.23340

Cited by 3 publications

(5 citation statements)

References 37 publications

(66 reference statements)

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“…For microwave device design, substrate-integrated waveguide (SIW) is an optimal option because of its highquality factor, small size, low loss, and low cost. It is extensively utilized in the design of different microwave gadgets, including filters, couplers, diplexers, and antennas [1][2][3][4][5][6][7]. Nevertheless, since SIW exhibits inherent multimode resonance characteristics, filters designed using it frequently fall short of providing an adequate stopband width.…”

Section: Introductionmentioning

confidence: 99%

Realization of a Wide Stopband Filter Using the Weakest Electric Field Method and Electromagnetic Hybrid Coupling Method

Yan,

Guo

2024

International Journal of RF and Microwave Computer-Aided Engine

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To enhance filter performance in terms of stopband, we propose a wide-stopband substrate-integrated waveguide filter based on the rejection of higher-order modes. The filter establishes the inner and outer coupling windows at the mode’s weakest electric field to achieve mode suppression. Simultaneously, we employ the electromagnetic hybrid coupling theory to analyze the electromagnetic distribution of the particular modes and determine the dimensions of the coupling circular apertures and slits based on the extracted coupling coefficients to attain suppression of the specific modes. The filter successfully suppresses all higher-order modes having resonant frequencies below that of the TE150 mode, as demonstrated by simulation results. We conducted measurements and found that the filter has a center frequency of 4.78 GHz, a bandwidth of 100 MHz with a -3 dB attenuation, and a stopband of -25 dB that extends up to 16.62 GHz (i.e., 3.48 times the center frequency). Simulation and measurement results demonstrate a good correlation. This method, compared to other SIW filters, is easy to design, has a wider stopband range, can be readily applied to practical microwave communication systems, and has potential applications.

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Section: Introductionmentioning

confidence: 99%

Realization of a Wide Stopband Filter Using the Weakest Electric Field Method and Electromagnetic Hybrid Coupling Method

Yan,

Guo

2024

International Journal of RF and Microwave Computer-Aided Engine

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“…2 Furthermore, because of its tolerance to high power, lower insertion loss, and compatibility, substrateintegrated waveguide (SIW) technology has been used in several recent designs of microwave and millimeter-wave devices. [3][4][5][6][7][8][9] To meet the demands and technological standards, much attention has been focused on designing many filtering channels using the SIW. To investigate the benefits of multichannel BPF, a five-channel filtering crossover was reported, 10 which exploited the tendencies of specified "frequency flexibility" for two separate frequency bands and "quadruple mode in a single cavity."…”

Section: Introductionmentioning

confidence: 99%

“…As a result, many BPFs are rapidly becoming a requirement in many radio frequency devices, as they aid in consolidating more hardware into single or fewer units 1 . For example, a multichannel BPF with multiple input and output signals of the same operating frequency and bandwidth has been realized using a method based on “cubic tri‐mode dielectric‐loaded cavities.” 2 Furthermore, because of its tolerance to high power, lower insertion loss, and compatibility, substrate‐integrated waveguide (SIW) technology has been used in several recent designs of microwave and millimeter‐wave devices 3–9 . To meet the demands and technological standards, much attention has been focused on designing many filtering channels using the SIW.…”

Section: Introductionmentioning

confidence: 99%

Two‐dimensional multichannel bandpass filter bank with improved fractional bandwidth and selectivity

Wilson

Song

Zhou

et al. 2023

Micro & Optical Tech Letters

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This letter presents a six‐channel bandpass filter bank created on substrate integrated waveguide (SIW) with improved bandwidth and frequency selectivity on the lower band. Through SIW square cavities and slant slots, a two‐dimensional multichannel bandpass filter bank with a transmission zero constructed with the SIW orthogonal resonant modes is produced. The substrate integrated square cavity approach is used to achieve the propagation of the two orthogonal‐oriented transverse electric modes, TE102 and TE201, which resonate on the same frequency and bandwidth, depending on the location of the feed ports. The bandwidth could be altered by the coupling matrix synthesis and coupling windows. Better transmission and bandpass responses are produced in each channel when the feed ports and coupling gaps are positioned and appropriately adjusted. However, a pair of slot lines are imprinted along each cavity's designated diagonal to guarantee better isolation while attaining an increased fractional bandwidth. A 3 × 3 array of six bandpass filters with a center frequency of 8.65 GHz has been built, simulated, and measured to establish the suggested technique. Low insertion loss, high return loss, high isolation, an improved fractional bandwidth, and a compact device were the proposal's advantages.

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“…In recent years, researchers have worked on the application of substrate-integrated waveguides and DGS structures to the design of microwave filters to realize higher-performance microwave filters [12][13][14][15]. Reference [12] proposes an in-line port-fed dual-mode substrate integrated waveguide filter, which utilizes metal tweak holes in the cavity to achieve the separation of the simple-parallel modes TE 120 and TE 210 to form a filter with two resonance points in the passband, and by changing the position of the metal tweak holes, the transmission zeros at different locations can also be achieved, but the relative bandwidth of the filter is small, and the parasitic passbands are close together.…”

Section: Introductionmentioning

confidence: 99%

“…The use of an air resonant cavity reduces the size of the filter, but the non-closed structure of the air resonant cavity also brings about a large insertion loss, and the filter's relative bandwidth is also smaller. Reference [14] proposes a substrate-integrated waveguide bandpass filter loaded with an E-type DGS structure, which utilizes the substrate-integrated waveguide as a transmission line, not as a resonant cavity. At this time, the substrate-integrated waveguide has the role of the high-pass, and the E-type DGS structure plays the role of the band-stop, which realizes that the parasitic passband is as far away as possible through the etching of multiple DGS structures on the ground of the substrate-integrated waveguide.…”

Section: Introductionmentioning

confidence: 99%

DGS Loaded Substrate Integrated Waveguide Dual Mode Cavity Filter

Yan,

Mu,

Guo

2023

PIER M

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A novel substrate-integrated waveguide (SIW) dual-mode cavity bandpass filter with a loaded defected ground structure (DGS) is proposed. The SIW dual-mode cavity operates in two modes, TE 110 and TE 120 , and the field distribution of the TE 110 mode is altered by installing a metal perturbation aperture in the middle of the cavity to bring its resonance frequency close to that of the TE 120 mode, forming a bandpass filter with two resonance points in the passband. A DGS structure is embedded at the ground level of the SIW to introduce a transmission zero in the high-frequency rejection band, thus improving the rejection performance of the filter for the high-frequency rejection band. The simulated and measured results show that the center frequency of the filter is 3.75 GHz; the 3 dB bandwidth is 0.3 GHz; the relative bandwidth is 8%; the return loss is less than −15 dB; and the insertion loss in the passband obtained from the simulation is about −0.35 dB, while that obtained from the measurement is 0.4 dB lower than that of the simulation, and the filter has a transmission zero near the high-frequency stopband of 6 GHz, which enables the high-frequency parasitic passband to move away from the passband of the filter. Except for the passband, all other signals in the Sub-6 GHz band can be effectively suppressed by the filter. This design combines the SIW dual-mode cavity with the DGS structure to design the filter, which can realize the flexible adjustment of bandwidth and transmission zero point, and the design method is simple and innovative. The filter can be applied to the 5G n77 frequency band, which has a certain application value.

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Millimeter‐wave substrate integrated waveguide bandpass filters based on stepped‐impedance E ‐shaped defected ground structure s

Cited by 3 publications

References 37 publications

Realization of a Wide Stopband Filter Using the Weakest Electric Field Method and Electromagnetic Hybrid Coupling Method

Realization of a Wide Stopband Filter Using the Weakest Electric Field Method and Electromagnetic Hybrid Coupling Method

Two‐dimensional multichannel bandpass filter bank with improved fractional bandwidth and selectivity

DGS Loaded Substrate Integrated Waveguide Dual Mode Cavity Filter

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