Miniature Triple-Mode Dielectric Resonator Filters

Bakr, Mustafa S.; Hunter, I.C.; Bösch, Wolfgang

doi:10.1109/tmtt.2018.2873309

Cited by 15 publications

(7 citation statements)

References 11 publications

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“…It is seen that with the increase of h d , the resonant frequency of TM 01δ mode reduces quickly, whereas Therefore, the cross-coupling between Node 1 and 4 and the cross-coupling between Node 5 and 2 can be ignored. Besides, the internal coupling between the two orthogonal degenerate HE 11 resonances (Node 2 and 4) is also negligible due to the symmetry of the structure without discontinuities to perturbate the degeneracy of the dual HE 11 resonances [26]. As a result, the coupling scheme in Fig.…”

Section: Resonance Behaviors In the Triple-mode Drmentioning

confidence: 99%

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Design of a Compact Triple-Mode Dielectric Resonator BPF with Wide Spurious-Free Performance

Liu

Zhang

et al. 2022

IEICE Trans. Electron.

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A novel compact 5-pole bandpass filter (BPF) using two different types of resonators, one is coaxial TEM-mode resonator and the other dielectric triple-mode resonator, is proposed in this paper. The coaxial resonator is a simple single-mode resonator, while the triple-mode dielectric resonator (DR) includes one TM 01δ mode and two degenerate HE 11 modes. An excellent spurious performance of the BPF is obtained due to the different resonant behaviors of these two types of resonators used in the BPF. The coupling scheme of the 5-pole BPF includes two cascade triplets (CTs) which produce two transmission zeros (TZs) and a sharp skirt of the passband. Behaviors of the resonances, the inter-resonance couplings, as well as their tuning methods are investigated in detail. A procedure of mapping the coupling matrix of the BPF to its physical dimensions is developed, and an optimization of these physical dimensions is implemented to achieve best performance of the filter. The designed BPF is operated at 1.84 GHz with a bandwidth of 51 MHz. The stopband rejection is better than 20 dB up to 9.7 GHz (about 5.39 × f 0 ) except 7.85 GHz. Good agreement between the designed and theoretically synthesized responses of the BPF is reached, verifying well the proposed configuration of the BPF and its design method.

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Section: Resonance Behaviors In the Triple-mode Drmentioning

confidence: 99%

“…A TE 01δ triple-mode BPF was developed in [20] using cubic DRs. In [26], a triple-mode DR using one TM 01δ mode and two HE 11 degenerate modes was designed to develop miniaturized BPFs. [29] tried to design triple-mode DR BPFs with controllable TZs.…”

Section: Introductionmentioning

confidence: 99%

Design of a Compact Triple-Mode Dielectric Resonator BPF with Wide Spurious-Free Performance

Liu

Zhang

et al. 2022

IEICE Trans. Electron.

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“…As explained in section III (A) and shown in Figure 6, a triple-mode filter with concentric dielectric puck and inductive input/output loops produces a bandpass filter with two transmission zeros on the low side. The realisation of transmission zeros on the high side requires capacitive input/output probes as reported in [6]. However, this may not be desired due to bandwidth, complexity and cost limitation.…”

Section: Design Examples a Bandpass Filters With Transmission Zementioning

confidence: 99%

“…As a consequence, the filter construction complexity and cost is increased. Several papers reported the realisation of triple-mode dielectric resonator filters using non-degenerate modes [5]- [8]. However, they do not explain how to control real-frequency transmission zeros placement.…”

Section: Introductionmentioning

confidence: 99%

Triple-Mode Microwave Filters With Arbitrary Prescribed Transmission Zeros

Bakr

2021

IEEE Access

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This article presents a new filter design for arbitrary placement of real frequency transmission zeros in triple-mode filters, allowing for either asymmetric or symmetric responses. Triple-mode filters can be viewed, in general, as a series combination of coupled resonators with non-adjacent couplings, allowing for the realisation of transmission zeros. The strength and phase of couplings dictate the transmission zeros locations. The arbitrary placement of transmission zeros requires controlling all amplitude and phase rations, i.e., the ability to realise both negative and positive couplings. In general, this necessitates the use of capacitive and inductive probe structures complicating the construction and hence increasing the filter cost. The method presented in this article enables arbitrary placement of transmission zeros using only inductive or only capacitive couplings structures. In addition, broadband filtering characteristics can be realised using triple-mode filters. Examples of several narrow and broadband bandpass filters are given indicating that this method is valid for most triple-mode structures.

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“…For TM 010 mode cylindrical DR, as illustrated in [15], both circular surfaces of a dielectric rod are in contact with the metallic enclosure. In [16], the resonator shown in Fig. 1 is used to design triple-mode DR filters with significant size reduction.…”

Section: Analysis Of Quasi-tm 010 Mode Drmentioning

confidence: 99%

Miniaturized High-Performance Cube-Shaped Filter Made Up of Quasi-TM₀₁₀ Mode Dielectric-Loaded Cavities

Zeng

Lin

2020

IEEE Access

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In this paper, a compact quasi-TM 010 mode dielectric-loaded bandpass filter with 8th-order pseudoelliptic filtering function and symmetric positioning of 4 transmission zeros is analyzed and designed. The resonant frequency and field components of quasi-TM 010 mode of a cylindrical dielectric resonator (DR) were first calculated and simulated. Compared to the pure TM 010 mode, the unloaded Q factor of quasi-TM 010 mode can increase by 3000 to more than 8000 and then the dimensions of the single DR at 2.595GHz are π ×34 2 ×20 mm 3 (using ε r = 45). The magnetic coupling and electric coupling between dielectric-loaded cavities are studied and the dielectric window is innovatively proposed to generate electric coupling and to avoid the use of metallic probes that are cumbersome to assemble. In final, a quasi-TM 010 mode doublelayer filter with two pairs of symmetric transmission zeros is designed according to the cubic-like topology and fabricated and tested which exhibits close agreements between the simulated and measured results demonstrating the advantages of low insertion loss, very close-to-band rejections and compact configuration. The proposed filter has great potential for development in 5G mobile communication systems and microwave radar communication systems. INDEX TERMS Quasi-TM 010 mode, dielectric resonator, dielectric filter, elliptic filter, transmission zeros.

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Miniature Triple-Mode Dielectric Resonator Filters

Cited by 15 publications

References 11 publications

Design of a Compact Triple-Mode Dielectric Resonator BPF with Wide Spurious-Free Performance

Design of a Compact Triple-Mode Dielectric Resonator BPF with Wide Spurious-Free Performance

Triple-Mode Microwave Filters With Arbitrary Prescribed Transmission Zeros

Miniaturized High-Performance Cube-Shaped Filter Made Up of Quasi-TM₀₁₀ Mode Dielectric-Loaded Cavities

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Miniature Triple-Mode Dielectric Resonator Filters

Cited by 15 publications

References 11 publications

Design of a Compact Triple-Mode Dielectric Resonator BPF with Wide Spurious-Free Performance

Design of a Compact Triple-Mode Dielectric Resonator BPF with Wide Spurious-Free Performance

Triple-Mode Microwave Filters With Arbitrary Prescribed Transmission Zeros

Miniaturized High-Performance Cube-Shaped Filter Made Up of Quasi-TM010 Mode Dielectric-Loaded Cavities

Contact Info

Product

Resources

About

Miniaturized High-Performance Cube-Shaped Filter Made Up of Quasi-TM₀₁₀ Mode Dielectric-Loaded Cavities