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. 22, 1977
Filed:
Jun. 15, 1973
Ernest G Parker, Convent Station, NJ (US);
Constantino Lucanera, Blauvelt, NY (US);
Richard W Craine, Nutley, NJ (US);
International Telephone and Telegraph Corporation, Nutley, NJ (US);
Abstract
This invention relates to a method and apparatus for producing the 135 Hz modulation component which is superimposed as the ninth harmonic on a 15 Hz component thereby producing the normally required Tacan radiation pattern. A cylindrical antenna is employed having located on and around its surface active elements such as dipoles. The 135 Hz component is produced by step-wise rotation of a binary current distribution around the cylindrical array of active elements. Since the system is binary, only two current states are employed, each having a predeterminedamplitude and phase. A predetermined number of the active elements are excited by one of the signals, and the remainder of the elements are excited by the second signal. This excitation is electronically rotated in a non-symmetric manner around the cylindrical array, thereby producing the required 135 Hz component.