Spurious Free Non Uniform Width Dielectric Loaded Filters

Afridi, Sharjeel; Hunter, I.C.; Sandhu, Muhammad Yameen

doi:10.23919/eumc.2018.8541792

Cited by 5 publications

(4 citation statements)

References 10 publications

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“…Moreover, integrated ceramic waveguide filters, with nonuniform width resonators based on a monolithic ceramic structures, have been proposed in [43] and [44], respectively, in order to have a wide spurious-free bandwidth. Additionally, a recent contribution can be found in [45] discussing the design of a filter based on a waveguide loaded with dielectrics of different width, in order to obtain a wide spurious-free frequency range. However, these contributions, and the ones in the previous paragraph, only discuss narrow band structures.…”

Section: Introductionmentioning

confidence: 99%

Compact Wideband Hybrid Filters in Rectangular Waveguide With Enhanced Out-of-Band Response

Valencia

Boria

Guglielmi

et al. 2020

IEEE Trans. Microwave Theory Techn.

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This paper describes the design procedure of a compact wideband waveguide filter, based on stepped impedance resonators (SIR) and a combined usage of capacitive and inductive coupling irises, that provides a significant improvement in the out-of-band response of the filter with respect to the state-ofthe-art. In addition to theory, several filter prototypes have been designed and manufactured. A detailed sensitivity analysis has been also carried out. Finally, simulations and measurements are compared, showing very good agreement, thereby fully validating the new filter topology. Index Terms-Aggressive space mapping, band-pass filters, hybrid (inductive and capacitive) irises, stepped impedance resonator and wideband.

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Section: Introductionmentioning

confidence: 99%

Compact Wideband Hybrid Filters in Rectangular Waveguide With Enhanced Out-of-Band Response

Valencia

Boria

Guglielmi

et al. 2020

IEEE Trans. Microwave Theory Techn.

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“…Inductive couplings are introduced between resonators through irises, and input/output coupling is achieved through the coaxial cable by perturbing the magnetic field around the ceramic blocks of external resonators as [2]. The authors validated the idea and presented the simulated results in [21]. Simulated design and dimensions of ridge ceramic block are shown in Figure 9, which is used to design a sixth-degree dielectric loaded Chebyshev filter with nonuniform width ceramic blocks and ridged ceramic blocks, as shown in Figure 10 [6,7].…”

Section: Ceramic Loaded Waveguide Filter With Ridge and Nonuniform Wimentioning

confidence: 99%

Ceramic Waveguide Filters With Wide Spurious-Free Stopband Response

Afridi¹,

Hunter²,

Sandhu³

2019

PIER M

Self Cite

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This work proposes new filter design techniques to improve the out of band spurious performance of integrated ceramic waveguide filters and ceramic loaded filters. Various resonators of different types like non-uniform width, TEM and half ridge were used. The proposed filter designs offer a considerable miniaturization and significantly improved spurious performance up to 85% without compromising the figure of merits of the filters like Q-factor, return loss, etc. Two sixth order filters with best in-band and out-band performance have been fabricated. Measured results of the fabricated filters are in good agreement with the computer simulations, which confirm the validity and accuracy of designs.

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“…Nowadays, dielectric resonator (DR) cavity filters are widely used in mobile communication, radar and satellite systems. Great progress has been made in the study of the TE 01δ mode DR around the 1970s and the research results showed that DR cavity filters have advantages in terms of compact size, low loss and temperature stability [1]- [3]. Many scholars at home and abroad are devoted to the study of miniaturization of dielectric cavity filters.…”

Section: Introductionmentioning

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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Spurious Free Non Uniform Width Dielectric Loaded Filters

Cited by 5 publications

References 10 publications

Compact Wideband Hybrid Filters in Rectangular Waveguide With Enhanced Out-of-Band Response

Compact Wideband Hybrid Filters in Rectangular Waveguide With Enhanced Out-of-Band Response

Ceramic Waveguide Filters With Wide Spurious-Free Stopband Response

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

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Spurious Free Non Uniform Width Dielectric Loaded Filters

Cited by 5 publications

References 10 publications

Compact Wideband Hybrid Filters in Rectangular Waveguide With Enhanced Out-of-Band Response

Compact Wideband Hybrid Filters in Rectangular Waveguide With Enhanced Out-of-Band Response

Ceramic Waveguide Filters With Wide Spurious-Free Stopband Response

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

Contact Info

Product

Resources

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