Novel Miniaturized Monoblock Dielectric Filter Using Multiple-Function Resonator

Rui‐Sen Chen

doi:10.1109/TMTT.2025.3635694

Novel Miniaturized Monoblock Dielectric Filter Using Multiple-Function Resonator

2025-11-26

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DOI：10.1109/TMTT.2025.3635694

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In this article, a novel seven-pole miniaturized monoblock dielectric resonator (MDR) bandpass filter (BPF) using a multiple-function resonator (MFR) is proposed. Except for the quasi-TEM mode generated by the traditional metalized blind cylindrical hole (called Type-I resonator), a novel resonant mode generated by the metalized blind wall-shaped holes (called MFR) is introduced and discussed in detail. MFR demonstrates additional functionalities of frequency-constant coupling control by modifying resonator shape and size, reducing inter-resonator coupling strength when coupled with a Type-I resonator, and serving as an inherently isolated metallic wall. Such novel coupling mechanisms are then used to construct inline-shape cascaded triplet (CT) units with lower band and upper band transmission zeros (TZs). Then, a seven-pole 2.5-GHz BPF with 160 MHz bandwidth and three TZs is synthesized and designed. These three TZs are separately produced by three CT units with flexible TZ adjustment. The reuse of the resonant mode as the connecting node in different CT units can reduce the number of resonant modes, while also reducing the overall size and insertion loss (IL). The proposed monoblock dielectric filter has a compact size of $20\times 19.5\times 9.4$ mm ( $0.166\lambda _{0} \times 0.16\lambda _{0} \times 0.078\lambda _{0}$ ), and a low measured IL of 0.74 dB.

Keywords:

Bandpass filter (BPF)

cascaded triplet (CT)

cross-coupling

monoblock dielectric resonator (MDR)

multiple-function resonator (MFR)

transmission zero (TZ)

Novel Miniaturized Monoblock Dielectric Filter Using Multiple-Function Resonator

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