Spurious suppression of dielectric filters in practical wireless systems

Salehi, Amdreza; Reddy, Raja K.; Lukkarila, Teppo; Amir, S.

doi:10.1109/mwsym.2008.4633245

Cited by 5 publications

(2 citation statements)

References 8 publications

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“…Cohn [4] in 1968 introduced a first ceramic resonator filter having a permittivity of 100 and loss tangent of 0.0001. The prime disadvantages of these ceramic filters are their crowded mode chart near the passband that creates a significant challenge for the commercial base stations filters stop band specifications [5].…”

Section: Introductionmentioning

confidence: 99%

High Stop Band Rejection for Ceramic Loaded Waveguide Filters

et al. 2020

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This Paper describes the design procedure of a compact narrowband ceramic loaded filters with wide out of band response. The idea of loading the waveguide filter resonators with ceramic TEM blocks and ceramic ridge blocks are presented. Resonator loading with silver plated transverse electromagnetic (TEM) hole and silver plated ridge ceramic blocks offers wide spurious free bandwidth 2.45 times of center frequency. Simulated and measured results of six pole chebyshev Ceramic ridge loaded filter and simulated results of Ceramic TEM loaded filter are presented in this paper showing excellent outof-band performance. INDEX TERMS Chebyshev, Ceramic loaded, Spurious, Out-of-band, and TEM.

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Section: Introductionmentioning

confidence: 99%

High Stop Band Rejection for Ceramic Loaded Waveguide Filters

et al. 2020

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“…The major drawbacks of these filters are their crowded spurious modes near the passband. 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.…”

Section: Introductionmentioning

confidence: 99%

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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A Technique to Suppress Harmonic Outputs in Coaxial Cavity Filters at the Excitation Port

Doumanis

2016

IEEE Microw. Wireless Compon. Lett.

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Spurious suppression of dielectric filters in practical wireless systems

Cited by 5 publications

References 8 publications

High Stop Band Rejection for Ceramic Loaded Waveguide Filters

High Stop Band Rejection for Ceramic Loaded Waveguide Filters

Ceramic Waveguide Filters With Wide Spurious-Free Stopband Response

A Technique to Suppress Harmonic Outputs in Coaxial Cavity Filters at the Excitation Port

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