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Filtros multicapa de polvo criogénico con baja capacitancia parásita
Itishree Pradhan1, Hao Li1, Alina Rupp1,2
1Institute for Solid State Physics, The University of Tokyo, 5-1-5 Kashiwanoha, Kashiwa 277-8581, Japan.
The Review of scientific instruments
|February 4, 2026
Resumen
Desarrollamos un nuevo filtro de polvo criogénico que bloquea las señales de radiofrecuencia (RF) de alta frecuencia y reduce la interferencia eléctrica no deseada. Este diseño innovador previene el calentamiento de la muestra y mantiene el rendimiento de las mediciones en configuraciones sensibles.
Área de la Ciencia:
- Física
- Ingeniería Eléctrica
- Ciencia de Materiales
Sus antecedentes:
- Los filtros de polvo convencionales utilizan el efecto pelicular para la atenuación de señales de radiofrecuencia (RF).
- Estos filtros a menudo presentan una alta capacitancia parásita, lo que limita el ancho de banda en mediciones sensibles.
- La capacitancia parásita puede causar un calentamiento no deseado de la muestra en configuraciones criogénicas.
Objetivo del estudio:
- Desarrollar un filtro de polvo criogénico con alta atenuación de RF y baja capacitancia parásita.
- Mitigar la intrusión de señales de RF y el calentamiento asociado de la muestra.
- Preservar el rendimiento de los sistemas de medición sensibles.
Principales métodos:
- Diseño y fabricación de un filtro de polvo multicapa.
- Utilización de una estructura de carcasa novedosa para minimizar la capacitancia parásita.
- Prueba de atenuación de RF en el rango de gigahertz.
Principales resultados:
- Se logró una alta atenuación de la señal de RF en el rango de gigahertz.
- Se redujo significativamente la capacitancia parásita a tierra en comparación con los diseños convencionales.
- Se demostró la supresión del calentamiento de la muestra sin degradación del rendimiento.
Conclusiones:
- El filtro de polvo multicapa aborda eficazmente las limitaciones de los diseños convencionales.
- Esta tecnología permite mediciones sensibles en entornos criogénicos ricos en RF.
- Ofrece una solución para prevenir el calentamiento inducido por RF en instrumentación científica.
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