High Q TE01 mode DR cavity filters for wireless base stations

Liang, Xiuye; Blair, W.D.

doi:10.1109/mwsym.1998.705117

Cited by 6 publications

(2 citation statements)

References 15 publications

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“…So the resonator must not be too close to the walls of the cavity to prevent the conductor loss and the dielectric rod must have low permittivity in order to reduce the dielectric loss. Take the cylindrical cavity as an example, the cavity diameter is usually 1.5 times larger than the DR diameter and the height of the cavity is several times the size of the DR thickness [2]. In order to realize the spurious response as good as possible and get the other required characteristics, the resonator and cavity dimensions should be designed carefully.…”

Section: A Filter Configurationmentioning

confidence: 99%

Dielectric loaded cavity filter with wide spurious free region and better out-of-band rejection

Sun¹,

Li²,

Ge³

2006

2006 Asia-Pacific Microwave Conference

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Spurious modes suppressions are compared between the dielectric-loaded cavity filters with cylindrical and rectangular structures in this paper. Using mode matching method Mode charts are computed to analyze that. The comparisons show that the cylindrical cavity filter has better spurious response. Also filter with cross-coupling is discussed, which has sharper out-of-band rejection. Three experimental filters are designed. And the measured results have good agreement with the analysis.

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Section: A Filter Configurationmentioning

confidence: 99%

Dielectric loaded cavity filter with wide spurious free region and better out-of-band rejection

Sun¹,

Li²,

Ge³

2006

2006 Asia-Pacific Microwave Conference

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“…Microwave dielectric resonator(DR) filters are widely employed in modern microwave communication systems due to their high Q-factor, temperature stability and compact size (Liang and Blair , 1998;Zhongxiang et al, 2011). Nowadays, the requirements of these filters are becoming more challenging because of the limitations in frequency spectrum and the high data rate demand.…”

Section: Introductionmentioning

confidence: 99%

Improvement of the stopband spurious window for a dual-mode dielectric resonator filter by new coupling technique

Luhaib

Somjit

Hunter

2018

International Journal of Electronics

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This paper presents a new design technique for two configurations of a dual-mode filter using a dielectric loaded cavity operating at 1.95 GHz. The dielectric puck in the proposed filter was floated in the middle of a cylindrical metal cavity with short circuits on the side walls and holes through the ceramic from the side face. These holes allowed the insertion of coupling probes which did not affect the unloaded quality factor or the spurious window. The inline structure 4 th pole Chebyshev dual mode filter offers a 870 MHz suppression window while the planar configuration was 710 MHz from the resonance frequency and the operation bandwidth of 54 MHz. The volume reduction ratio was eight times larger compared with a coaxial filter of the same Q factor.

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A Novel Capacitive Cross-Coupling Structure for Ceramic-Filled Cavity Filters

Pan

et al. 2021

IEEE Access

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Since the probe coupling for cavity filters is unsuitable for ceramic-filled cavity filters, a novel capacitive cross-coupling structure is proposed to improve stopband suppression by introducing transmission zeros. This structure is implemented by first etching a coupling window on the silver-plated layer on the ceramic surface between two resonant cavities and then placing an isolated metal strip in the window. This structure enjoys high design freedom. Thus, the coupling coefficient between the two cavities is readily adjusted. Moreover, the structure has the advantages of a compact size and simple fabrication and tuning processes. For validation, a ten-pole ceramic-filled cavity filter for 5G applications is designed and evaluated. The proposed cross-coupling technology is used to introduce a pair of symmetrical transmission zeros at the band skirts to increase the frequency selectivity. The measured results are consistent with the simulated ones.

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High Q TE01 mode DR cavity filters for wireless base stations

Cited by 6 publications

References 15 publications

Dielectric loaded cavity filter with wide spurious free region and better out-of-band rejection

Dielectric loaded cavity filter with wide spurious free region and better out-of-band rejection

Improvement of the stopband spurious window for a dual-mode dielectric resonator filter by new coupling technique

A Novel Capacitive Cross-Coupling Structure for Ceramic-Filled Cavity Filters

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