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Abstract: In this paper, based on the E-field distributions of the first two modes in ridge WG resonators (TE₁₀₁ and TE₁₀₂ modes), a tuning post (Tup) is embedded in the central region of the ridge. By adjusting the Tup depth, the resonant frequency of the fundamental TE₁₀₁ mode (f₁₀₁) is significantly reduced, whereas the first harmonic TE₁₀₂ mode remains almost unchanged, indicating that both miniaturization and a wide upper stopband can be achieved. Furthermore, a half-wavelength resonant slot (HWRS) resonator is introduced between two ridge WG resonators to construct a three-pole BPF. This configuration reduces the BPF length and introduces cross-coupling, thereby generating a TZ in the upper stopband. In addition, the thickness of the HWRS resonator provides an extra path to control the cross-coupling, enabling precise TZ positioning within a certain range. Measurement results indicate that the proposed filter achieves a size reduction of approximately 90% and wider upper stopband rejection compared with a filter based on a traditional ridge WG (Chen et al., 2025)

基于腔体内异构谐振器的宽上阻带小型化带通滤波器

[1]Chaudhary MA, Ahmed MM, 2023. Pseudoelliptic waveguide filters using U-shaped ridge resonators. IEEE Trans Circ Syst II Expr Briefs, 70(2):371-375.

[2]Chen JX, Zhan Y, Qin W, et al., 2016. Analysis and design of balanced dielectric resonator bandpass filters. IEEE Trans Microw Theory Tech, 64(5):1476-1483.

[3]Chen JX, Li YL, Qin W, et al., 2018. Compact multi-layer bandpass filter with wide stopband using selective feeding scheme. IEEE Trans Circ Syst II Expr Briefs, 65(8):1009-1013.

[4]Chen JX, Xue Y, Shi X, et al., 2024. Design of double-ridge waveguide balanced filter and filtering power divider. IEEE Trans Microw Theory Tech, 72(10):5929-5937.

[5]Chen JX, Xue Y, Shi X, et al., 2025. Analysis and design of compact ridge waveguide bandpass filter and filtering balun with improved upper stopband performance. IEEE Trans Microw Theory Tech, 73(7):3977-3986.

[6]di Crestvolant VT, de Paolis F, 2018. Dimensional synthesis of evanescent-mode ridge waveguide bandpass filters. IEEE Trans Microw Theory Tech, 66(2):954-961.

[7]Fahmi MM, Ruiz-Cruz JA, Mansour RR, et al., 2009. Compact ridge waveguide filters with arbitrarily placed transmission zeros using nonresonating nodes. IEEE Trans Microw Theory Tech, 57(12):3354-3361.

[8]Fang X, Li YC, Li LW, et al., 2022. A dual-band tunable balanced filter with independently tuning bands. IEEE Trans Circ Syst II Expr Briefs, 69(4):2076-2080.

[9]Hong JS, Lancaster MJ, 2001. Microstrip Filters for RF/Microwave Applications. John Wiley & Sons, Inc., New York, NY, USA, p.215-219.

[10]Huang ZY, Jiang Y, Wu WW, et al., 2021. W-band bandpass filter using rectangular microcoaxial structure. IEEE Microw Wirel Compon Lett, 31(8):957-960.

[11]Lin JY, Yang Y, Wong SW, et al., 2023. Two-way waveguide diplexer and its application to diplexing in-band full-duplex antenna. IEEE Trans Microw Theory Tech, 71(3):1171-1179.

[12]Qin W, Zhou YK, Yang WW, et al., 2024. Dielectric waveguide bandpass filters with multiple transmission zeros by constructing cascaded-trisection coupling structures. IEEE Trans Microw Theory Tech, 72(7):4218-4228.

[13]Ruiz-Cruz JA, Sabbagh MAE, Zaki KA, et al., 2005. Canonical ridge waveguide filters in LTCC or metallic resonators. IEEE Trans Microw Theory Tech, 53(1):174-182.

[14]Snyder RV, Macchiarella G, Bastioli S, et al., 2021. Emerging trends in techniques and technology as applied to filter design. IEEE J Microw, 1(1):317-344.

[15]Tang WS, Li M, Zhang YM, et al., 2024. Compact dielectric waveguide filters with controllable transmission zeros using dual external coupling and hybrid ridge and post. IEEE Trans Microw Theory Tech, 72(11):6574-6584.

[16]Tomassoni C, Bastioli S, Snyder RV, 2016. Compact mixed-mode filter based on TE₁₀₁ cavity mode and TE_01δ dielectric mode. IEEE Trans Microw Theory Tech, 64(12):4434-4443.

[17]Utsumi Y, 1985. Variational analysis of ridged waveguide modes. IEEE Trans Microw Theory Tech, 33(2):111-120.

[18]Widaa A, Höft M, 2023. Widely tunable TM-mode dielectric filters with constant absolute bandwidth using re-entrant caps. IEEE J Microw, 3(2):706-714.

[19]Wong SW, Lin JY, Yang Y, et al., 2021. Waveguide components based on multiple-mode resonators: advances in microwave multiple-mode waveguide components, including multiplexers, three-state diplexers, crossovers, and balanced/unbalanced elements. IEEE Microw Mag, 22(2):33-45.

[20]Xiang KR, Chen FC, Chu QX, 2023. Compact waveguide filters using novel resonant coupling structures. IEEE Trans Microw Theory Tech, 71(5):2129-2138.

[21]Xie Y, Chen FC, Chu QX, 2023. Inline box-like dielectric filters with asymmetric and symmetric responses. IEEE Trans Microw Theory Tech, 71(6):2522-2531.

[22]Xu ZY, Wu YL, Li SB, et al., 2024. Exhaustive design and realization for in-line topology quasi-TEM mode dielectric waveguide filter with dispersive couplings. IEEE Trans Circ Syst II Expr Briefs, 71(7):3333-3337.

[23]Zeng Y, Che C, Yu M, et al., 2023. Novel miniaturized light-weight coaxial cavity filters with electrical mainline couplings. IEEE J Microw, 3(3):1040-1050.

[24]Zhang CY, Shi X, Zhu YH, et al., 2025. A compact interlaced-double-ridge waveguide balanced filter with wideband CM suppression. IEEE Microw Wirel Technol Lett, 35(2):169-172.

[25]Zhao W, Wu YL, Yang YH, et al., 2022. Novel on-chip wideband filtering power dividers with high selectivity and ultra-wide out-of-band suppression in LTCC technology. IEEE Trans Circ Syst II Expr Briefs, 69(11):4288-4292.

[26]Zhu YH, Qin W, Chen JX, 2024. Compact waveguide filtering power dividers with flexible division ratio and enhanced selectivity. IEEE Trans Compon Packag Manuf Technol, 14(11):2043-2049.