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Filter structures to avoid microwave leakage of continuous-flow microwave applicators
Microwave applicators for continuous-flow processing always need openings for the material flow. In contrast to cyclic operation it is not possible to close any doors while the microwave is active. This paper presents filter structures that blocks the microwave, concurrently allowing the material stream to pass through the filter. So the difficulty is to design such a filter in a way that it operates almost independent of the presence of any material inside the filter. The complete method to design such a filter as well as a working prototype designed for a 2.45 GHz microwave assisted continuous-flow parquet press are shown. Two different concepts of filters to avoid microwave leakage from continuous-flow applicators are investigated. It has been shown that a high efficient mode matching method could be used to successfully calculate the behaviour of both filter types. While the performance of the periodic filter is theoretically less compared to the resonant block structures it is preferable to use the periodic filter due to its non-resonant frequency dependency leading to a higher reliability in case of frequency and material parameter variation. The sections give an outline of the method used for the calculation of these filters. For both types suitable filter structures to be mounted at the in- and output openings of a microwave assisted parquet press are presented. The advantages and disadvantages for each type will be discussed and the performance of the more suitable filter type will be verified by measurements.
Filter structures to avoid microwave leakage of continuous-flow microwave applicators
Microwave applicators for continuous-flow processing always need openings for the material flow. In contrast to cyclic operation it is not possible to close any doors while the microwave is active. This paper presents filter structures that blocks the microwave, concurrently allowing the material stream to pass through the filter. So the difficulty is to design such a filter in a way that it operates almost independent of the presence of any material inside the filter. The complete method to design such a filter as well as a working prototype designed for a 2.45 GHz microwave assisted continuous-flow parquet press are shown. Two different concepts of filters to avoid microwave leakage from continuous-flow applicators are investigated. It has been shown that a high efficient mode matching method could be used to successfully calculate the behaviour of both filter types. While the performance of the periodic filter is theoretically less compared to the resonant block structures it is preferable to use the periodic filter due to its non-resonant frequency dependency leading to a higher reliability in case of frequency and material parameter variation. The sections give an outline of the method used for the calculation of these filters. For both types suitable filter structures to be mounted at the in- and output openings of a microwave assisted parquet press are presented. The advantages and disadvantages for each type will be discussed and the performance of the more suitable filter type will be verified by measurements.
Filter structures to avoid microwave leakage of continuous-flow microwave applicators
Filterstrukturen zur Vermeidung von Mikrowellenleckagen bei Mikrowellenapplikatoren mit kontinuierlichem Materialfluss
Kayser, T. (Autor:in) / Pauli, M. (Autor:in) / Wiesbeck, W. (Autor:in) / Zwick, T. (Autor:in)
2009
4 Seiten, 3 Bilder, 3 Quellen
Aufsatz (Konferenz)
Englisch
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