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:
Sep. 23, 2003
Filed:
Jan. 03, 2002
Miles E. Goff, Carlisle, MA (US);
Raytheon Company, Lexington, MA (US);
Abstract
A microstrip to circular waveguide transition having an elongated circular waveguide portion and a stripline circuit portion disposed within the waveguide portion. The stripline includes a strip conductor disposed in a strip conductor plane. The strip conductor extends along a longitudinal axis of the circular waveguide portion from a first region of the transition to a longitudinally spaced second region of the transition. The stripline circuit portion includes a pair of overlying ground planes extending along the longitudinal axis from the first region to the second region, such pair of ground planes being disposed in overlying planes parallel to the strip conductor plane. The strip conductor is spaced from a pair of diametrically opposed first portions of the sidewalls in the first region and bends towards a first of a pair of diametrically opposed second portions of the sidewalls and away from a second one of the pair of opposed second portions of the sidewalls as such strip conductor extends within the waveguide portion towards the second region. The pair of overlying ground planes is disposed adjacent the diametrically opposed sidewall portions of the sidewalls in the first region of the transition and bend away from the first one of the pair of diametrically opposed second portions of the sidewalls and towards the second one of the diametrically opposed second portions of the sidewalls as such pair of ground planes extends within the waveguide section towards the second region. With such an arrangement, the stripline circuit portion provides two symmetrically located ground planes, which make two symmetrical E, field vectors. X-axis components of these vectors add to excite the desired mode in the circular waveguide. Y-axis components of these two vectors are in opposite directions, and will thus cancel out the contribution of coupling to the undesired orthogonal mode in the circular waveguide. This cancellation, due to symmetry, is not related to any particular wavelength, and thus the phenomenon is very broadband.