Various Questions and Exploratory Ways
Bernard Piette, Daniel Pasquet · 2013
The small world of high-frequency passive devices possesses its margin of progression, related particularly to the ever new demands of radiocommunications. This chapter presents a certain number of ideas not implemented yet, but that merely await the opportunity to be so, as well as certain questions with or without answers, but that constantly inspire existential thinking among technicians. A myth, or an eternal hope, the coupler without internal loss has become a recurrent theme for free discussion that sometimes takes place during breaks in the most diverse mediums of HF applications. The chapter then discusses infinite rejection band-pass. The production of multicouplers working below 100 MHz requires cavities of dimensions such that it is often necessary to reserve a full rack to the coupling system. Helical resonators can solve this problem of size and thus allow the integration of the multicoupler in another bay. Controlled Vocabulary Terms band-pass filters; radio communication equipment; resonator filters