We present an efficient fabrication method for absorptive microwave filters based on Eccosorb CR-124. Filters are fabricated from readily available parts, and their cutoff frequency can be set by their length. They exhibit desirable properties such as a very large and deep stop band with rejection beyond 120 dB at least up to 40 GHz, more than 10 dB return loss in both the pass and the stop band, and an error-function shaped step response without overshoot. Measurements at very low temperatures show that the filters thermalize on a time scale of approximately 100 s, and that they can absorb power as high as 100 nW with their noise temperature staying remarkably low, below 100 mK. These properties make the filters ideal for cryogenic filtering and filtering of intermediate frequency port signals of mixers.
We present an efficient fabrication method for absorptive microwave filters based on Eccosorb CR-124. Filters are fabricated from readily available parts and their cut-off frequency can be set by their length. They exhibit desirable properties such as a very large and deep stop band with rejection beyond 120 dB at least up to 40 GHz, more than 10 dB return loss in both the pass and the stop band as well as an error-function shaped step response without overshoot.Measurements at very low temperature show that the filters thermalize on a time scale of the order of 100 s and that they can absorb power as high as 100 nW with their noise temperature staying remarkably cool, below 100 mK.These properties make the filters ideal for cryogenic filtering and filtering of IF port signals of mixers.
E N SE RÉFÉRANT aux premiers travaux de Freud, Jones, son biographe, dit entre autres ceci: Il n'aurait jamais pu être mathématicien ou physicien, ni même un expert en problèmes d'échecs. Il écrivait avec facilité, sans effort, spontanément, mais détestait corriger ses travaux. ... je dirai que si Freud y avait apporté plus de soins et d'attention scrupuleuse, bien des obscurités, bien des ambiguïtés auraient été facilement évitées, ses traducteurs ne manqueront pas de m'approuver, car ces négligences ne constituent pas la moindre des difficultés auxquelles ils se heurtent 1. Fort de cet appui, il ya certes lieu d'indiquer une double difficulté dans ce bref texte de Freud sur les « Actes obsédants et les exercices religieux 2 » : difficulté, au niveau de la forme (voire de la traduction elle-même) et difficulté, au niveau du contenu, de ce travail qui se situe au tout début d'une recherche sur l'homme et, en voie de conséquence, sur la religion. Ce n'est qu'en regard de cette recherche qu'il y a lieu d'approfondir ce texte, de l'étayer, et qu'il y a possibilité de parvenir à une véritable compréhension de son sens et de sa portée.
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