Miniaturized dielectric waveguide filters

Sandhu, Muhammad Yameen; Hunter, I.C.

doi:10.1080/00207217.2016.1138531

Cited by 14 publications

(8 citation statements)

References 28 publications

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“…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]. This filter exhibits a good spurious-free window of more than 2.45 * f o shown in Figure 11.…”

Section: Ceramic Loaded Waveguide Filter With Ridge and Nonuniform Wimentioning

confidence: 95%

“…This proximity of higher order modes creates a significant challenge for the design of a filter which meets commercial base stations' out of band rejection specifications [5]. In [6,7], a high permittivity dielectric waveguide filter achieved 50% size reduction in comparison with an air filled TEM filter, but the designed filter suffered from crowded higher order modes resonating near the passband. Different design techniques have been proposed to improve stopband performance of ceramic waveguide filters.…”

Section: Introductionmentioning

confidence: 99%

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Ceramic Waveguide Filters With Wide Spurious-Free Stopband Response

Afridi¹,

Hunter²,

Sandhu³

2019

PIER M

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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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Section: Ceramic Loaded Waveguide Filter With Ridge and Nonuniform Wimentioning

confidence: 95%

Section: Introductionmentioning

confidence: 99%

Ceramic Waveguide Filters With Wide Spurious-Free Stopband Response

Afridi¹,

Hunter²,

Sandhu³

2019

PIER M

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“…However, their large physical size is not conducive to integration into other microwave circuits 9‐12 . Therefore, to balance the advantages of convenient integration and high performance, a cross‐coupled filter based on a dielectric waveguide is considered 13‐15 . These filters can be made physically smaller because of their high‐dielectric constant and flexible I/O configuration, which is convenient for integrated applications.…”

Section: Introductionmentioning

confidence: 99%

Cross‐coupled dielectric waveguide filter

Huang

Cheng

2021

Int J RF Microw Comput Aided Eng

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A cross‐coupled dielectric waveguide filter based on blind holes and via holes is proposed in this study. Using a unique all‐hole design, a fourth‐order cross‐coupled dielectric waveguide bandpass filter is realized by drilling via holes or blind holes in a square dielectric waveguide, followed by coating the surface with thin metal. Magnetic coupling is realized using two blind holes located symmetrically above and below each other. Further, electrical coupling is realized using a combination of two blind holes located symmetrically above and below each other and an interconnecting via hole. Both types of coupling are analyzed and designed. Moreover, a circular via hole is provided in the middle of the square cavity to suppress the parasitic response of the filter. Coupling debugging holes, resonant debugging holes, and feed holes are realized using shallow blind holes, thereby alleviating the process of manufacturing and debugging. The structure of the designed filter is discussed, simulated, manufactured, and measured. The results show that the proposed filter has a center frequency of 3.5 GHz, an insertion loss of less than 0.5 dB, a return loss of less than 15 dB, and a relative bandwidth of 5%, exhibiting excellent performance that includes two out‐of‐band transmission zeros.

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“…One is materials with stable high dielectric constant, the other is filters with frequency stability coefficients close to zero. Therefore, DW filters, 6‐9 which fill the medium in the traditional metal waveguide cavity, have become the focus of recent academic and industrial research.…”

Section: Introductionmentioning

confidence: 99%

Novel dielectric waveguide filter using isosceles right‐angled triangular resonators

Huang

Cheng

Liu

2020

Micro & Optical Tech Letters

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A novel dielectric waveguide filter based on isosceles right‐angled triangular (RAT) resonators is presented in this letter. By connecting the vertices of four isosceles RAT waveguide cavities, a square fourth‐order cross‐coupled waveguide bandpass filter is formed. The presented filter uses the partition wall and shallow blind hole to realize positive coupling and the deep blind hole to realize negative coupling. Moreover, the filter facilitates debugging and testing by setting the debugging blind hole on one side of the waveguide and setting the feed blind hole on the opposite side. The design, analysis, and simulation of the physical model of the filter are discussed. The fabricated filter has a center frequency of 3.5 GHz, relative bandwidth of 5%, insertion loss of less than 1 dB, in‐band return loss of more than 15 dB, and two out‐of‐band transmission zeros at 3.27 and 3.65 GHz.

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Miniaturized dielectric waveguide filters

Cited by 14 publications

References 28 publications

Ceramic Waveguide Filters With Wide Spurious-Free Stopband Response

Ceramic Waveguide Filters With Wide Spurious-Free Stopband Response

Cross‐coupled dielectric waveguide filter

Novel dielectric waveguide filter using isosceles right‐angled triangular resonators

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