The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Mar. 20, 1979
Filed:
Jul. 19, 1977
Jean-Pierre Boujet, Chatillon, FR;
Abstract
A series connection of n diplexers is used as a multiplexer for separating a hyperfrequency band into n + 1 sub-bands (or vice-versa). Each diplexer comprises a semi-circular inlet coupler followed by a semi-circular high-pass filter and by a semi-circular outlet coupler, the filter at each stage is dimensioned to reflect only the lowest of the sub-bands which it receives from the previous stage. The creation of unwanted parasitic modes in the reflected sub-band is avoided by so choosing the radius of the inlet coupler that the reflected sub-band lies between the frequencies at which the parasitic TE.sub.12 and TE.sub.22 modes occur. This is achieved by use of the relationship ##EQU1## WHERE V IS THE SPEED OF LIGHT, FMAX AND FMIN ARE THE UPPER AND LOWER LIMIT FREQUENCIES OF THE REFLECTED SUB-BAND AND P'.sub.12 and P'.sub.22 are the second zeros of the first and second order Bessel functions characterising the respective semi-circular TE.sub.12 and TE.sub.22 modes.