Analysis of reactive and resistive open waveguide filters for use in microwave‐heating applicators

Clemente‐Fernández, Francisco Javier; Monzó‐Cabrera, Juan; Pedreño-Molina, J.L.; Guerrero, Antonio José Lozano; Díaz‐Morcillo, Alejandro

doi:10.1108/03321641111152766

Cited by 2 publications

(1 citation statement)

References 9 publications

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“…Microwave bandstop filters are frequently used in microwave heating ovens. This is the case with corrugated filters [13][14][15] at the input and output ports in tunnel applicators, or λ g 4 chokes at the oven door (where λ g is the wavelength at the operation frequency) [16]. High-pass filters with cutoff waveguide grids can also be found in microwave oven doors or at air flow inlets or outputs.…”

Section: Introductionmentioning

confidence: 99%

A Novel Bandstop Filter Based on Two-Port Coaxial Cavities for the Installation of Metallic Mode Stirrers in Microwave Ovens

et al. 2022

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Metallic stirrers are commonly used in mode-stirred reverberation chambers but are less common in microwave ovens, because the use of a metallic axis creates a coaxial port in the cavity wall where the axis is introduced, which may result in significant microwave leakage levels. However, due to electromagnetic, mechanical, temperature, or chemical requirements, metallic axes must be used in some cases. In this paper, we present a high power coaxial filter that enables the use of metallic stirrers in microwave applications. The filter employs two-port coaxial cavities that are analyzed to determine their design parameters. These cavities are coupled via coaxial lines to achieve proper attenuation levels. The cavities were designed using commercial electromagnetic (EM) software, and a filter prototype was validated using vector network analyzer (VNA) measurements. The simulated and measured results show that a three-stage configuration can achieve attenuations greater than 70 dB at the 2.45 GHz ISM band, allowing the use and external handling of the metallic axis inserted into microwave ovens with negligible microwave radiation leakage.

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Section: Introductionmentioning

confidence: 99%

A Novel Bandstop Filter Based on Two-Port Coaxial Cavities for the Installation of Metallic Mode Stirrers in Microwave Ovens

et al. 2022

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A new sensor-based self-configurable bandstop filter for reducing the energy leakage in industrial microwave ovens

Clemente‐Fernández¹,

Monzó‐Cabrera²,

Pedreño-Molina³

et al. 2012

Meas. Sci. Technol.

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Abstract. In this work a new sensor-based self-configurable waveguide bandstop filter that uses a combination of metallic irises and reconfigurable posts for reducing the energy leakage in industrial microwave ovens is presented and validated through a procedure fully based on measurements. Several optimization and reconfiguration alternatives of the moving posts such as genetic algorithms and parametric sweeps are assessed. Results show that good attenuation values can be obtained for all the analyzed scenarios. In particular, genetic algorithms are shown as the best search strategy. Design and optimization times are also reduced when using the proposed filter compared to computer simulations.

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Analysis of reactive and resistive open waveguide filters for use in microwave‐heating applicators

Cited by 2 publications

References 9 publications

A Novel Bandstop Filter Based on Two-Port Coaxial Cavities for the Installation of Metallic Mode Stirrers in Microwave Ovens

A Novel Bandstop Filter Based on Two-Port Coaxial Cavities for the Installation of Metallic Mode Stirrers in Microwave Ovens

A new sensor-based self-configurable bandstop filter for reducing the energy leakage in industrial microwave ovens

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