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:
Jul. 24, 1979
Filed:
Dec. 23, 1977
Joseph G DiTullio, Woburn, MA (US);
Leonard I Parad, Framingham, MA (US);
GTE Sylvania Incorporated, Stamford, CT (US);
Abstract
A microwave diplexer apparatus for handling simultaneously two independent polarized transmitted signals at one frequency and two independent polarized received signals at a lower frequency. In the transmit mode of operation of the diplexer apparatus, a pair of input signals to be transmitted to a target are applied to a first orthogonal mode transducer wherein the electric fields of the signals are established at right angles to each other. The orthogonal linearly-polarized signals are then transformed by a pin/ridge-loaded circular polarizer device to oppositely-rotating circularly-polarized signals and coupled via an antenna port of a second orthogonal mode transducer to an antenna for transmission to the desired target. In the receive mode of operation, a pair of independent oppositely-rotating circularly-polarized signals from the target are received and coupled via the antenna port of the second orthogonal mode transducer to other ports of the second orthogonal mode transducer to which pairs of arms having pins and ridges associated therewith are coupled for introducing a phase shift differential to the vectoral components of the circularly-polarized signals as established within the pairs of arms. The vectoral components in each pair of arms are combined within a third orthogonal mode transducer so as to be orthogonal and linearly-polarized with respect to each other and then applied to a fourth orthogonal mode transducer wherein a pair of resultant, orthogonal, linearly-polarized signals corresponding to the two circularly-polarized signals are derived and applied to separate output ports.