Compact Bandpass Filter With High Selectivity Using Quarter-Mode Substrate Integrated Waveguide and Coplanar Waveguide

He, Zhaosheng; You, Chang Jiang; Leng, Supeng; Li, Xiang; Huang, Yong Mao

doi:10.1109/lmwc.2017.2734845

Cited by 40 publications

(23 citation statements)

References 10 publications

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“…Table 1 summarises some reported filter structures using the SIW technique in references for comparisons. When 4th-order filters are considered (see [1,3,5,13,16,20,29]), the proposed 4th-order filters (see Figs. 4, 7 and 11) are more compact obviously.…”

Section: Discussion and Comparisonsmentioning

confidence: 99%

“…The first one is using the incomplete-mode SIW cavities, e.g. half-mode SIW (HMSIW) [9][10][11], quarter-mode SIW (QMSIW) [12][13][14][15][16][17][18][19], and eighth-mode SIW (EMSIW) [14,[20][21][22][23][24] cavities to design filters, which is a well-compromising method. The sizes of HMSIW, QMSIW and EMSIW cavities can be reduced by 1/2, 3/4 and 7/8, respectively, but the unload quality factors (Q u ) of them may be lower than that of full-mode SIW cavity.…”

Section: Introductionmentioning

confidence: 99%

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Realisation of compact quasi‐elliptic bandpass filters based on coupled eighth‐mode SIW cavities

Liu¹,

Zhou²,

Lv³

et al. 2019

IET Microwaves, Antennas & Propagation

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A novel basic quasi‐elliptic response bandpass filter in quadruplet based on coupled TE101‐mode‐based eighth‐mode substrate integrated waveguide (EMSIW) cavities is proposed and analysed firstly. The negative cross coupling is achieved by the nature of coupled fringe electric‐field components of the first and fourth cavities. Then, based on the proposed basic quadruplet structure, two methods using a step‐impedance resonator and meandered feeding lines, respectively, are introduced and analysed to realise S‐L coupling to improve the upper stopband performance further. Finally, two possible structures with quasi‐inline and quasi‐folded layouts, respectively, are proposed to realise sixth‐order EMSIW filters. Five EMSIW filters are designed, fabricated, and measured to demonstrate and verify the proposed structures. The proposed filters have the advantages of compact size, good out‐of‐band rejection and realisation of higher‐order filtering function. The size of the realised 4th‐/6th‐order filter is less than 0.13/0.17λg2. The out‐of‐band rejection higher than 28 dB can reach 2.32f0.

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Section: Discussion and Comparisonsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Realisation of compact quasi‐elliptic bandpass filters based on coupled eighth‐mode SIW cavities

Liu¹,

Zhou²,

Lv³

et al. 2019

IET Microwaves, Antennas & Propagation

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show abstract

“…Especially, fractional‐mode SIW cavities offer a new design concept for component miniaturisation. Some compact half‐mode (HM) and quarter‐mode (QM) bandpass filters have been developed in [2–4 ]. However, mixed‐coupling is rarely utilised in these designs, which can introduce additional transmission zeros (TZs) and improve stopband performance [5 ].…”

Section: Introductionmentioning

confidence: 99%

Self-diplexing mixed-coupling bandpass filter based on single slotted SIW cavity

Niu

Cao

2020

Electronics Letters

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A self‐diplexing mixed‐coupling bandpass filter based on a single slotted substrate‐integrated‐waveguide (SIW) cavity is proposed. By etching a wide slot, two unequal half‐mode SIW parts are constructed and then fed by four coaxial ports to realise two bandpass filters with different centre frequencies. Since this etched slot can serve as a divider and an isolator, a flexible frequency ratio of 0.60–1.66 and high isolation of better than 20.0 dB is achieved. By further cutting the other two narrow slots, four quarter‐mode sub‐cavities are obtained where the mixed coupling is induced in the pass bands and a transmission zero (TZ) is introduced at the stopbands. The coupling and TZ are controllable by simply adjusting the length of these cut slots, which makes the proposed design easily redesigned for practical applications. A prototype with a size of 0.59λ0 × 0.59λ0 × 0.03λ0 has been fabricated. The measured centre frequency, TZ, 3‐dB bandwidth, and insertion loss of the lower pass band is 2.51 GHz, 2.96 GHz, 340 MHz, and 1.67 dB, respectively, whereas those of the upper pass band is 3.06 GHz, 2.53 GHz, 370 MHz, and 2.44 dB, respectively.

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“…However, the unload quality factors (Q u ) of SIW cavities are deteriorated by the special slot lines, which results in large in-band insertion loss (IL). The second one is using the incomplete mode SIW cavities, e.g., half-mode SIW (HMSIW) [13,14,15,16,17], quarter-mode SIW (QMSIW) [18,19,20,21,22,23], and eighth-mode SIW (EMSIW) cavities [19,22,23,24]. The sizes of them can be reduced, especially in the EMSIW cavity.…”

Section: Introductionmentioning

confidence: 99%

A quasi-elliptic response triple-mode SIW bandpass filter with controllable transmission zeros

Liu

Yang³

2019

IEICE Electron. Express

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This letter reports a novel quasi-elliptic bandpass filter (BPF) using a new triple-mode circle-shaped substrate integrated waveguide (SIW) cavity. The triple-mode SIW cavity is achieved by a dual-mode circle-shaped SIW cavity with a floating capacitive-loaded metallic patch. The resonance of one higher-order mode is independently shifted to that of dual modes to form a three-pole passband. Three finite transmission zeros (FTZs) can be produced, and two of them can be controlled well by the angle between two feeding lines. For the demonstration, a prototype filter was designed, fabricated and measured. Good agreement between measured results and simulated results is observed. The proposed triple-mode SIW filter has the merits of compact size, high selectivity and controllable bandwidth as well as FTZs.

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Compact Bandpass Filter With High Selectivity Using Quarter-Mode Substrate Integrated Waveguide and Coplanar Waveguide

Cited by 40 publications

References 10 publications

Realisation of compact quasi‐elliptic bandpass filters based on coupled eighth‐mode SIW cavities

Realisation of compact quasi‐elliptic bandpass filters based on coupled eighth‐mode SIW cavities

Self-diplexing mixed-coupling bandpass filter based on single slotted SIW cavity

A quasi-elliptic response triple-mode SIW bandpass filter with controllable transmission zeros

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