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:
Dec. 04, 2001
Filed:
Feb. 15, 2001
Makoto Shigihara, Fukushima-ken, JP;
Alps Electric Co., Ltd., Tokyo, JP;
Abstract
The present invention provides a miniaturized circular polarized microstrip antenna that employs a dielectric substrate having a large relative dielectric constant so that a desired resonance frequency and a desired axis ratio are obtained. In a circular polarized wave microstrip antenna,having a nearly square dielectric substrate,with a nearly square patch electrode,formed on one surface thereof, and a ground electrode,formed on almost the whole of another surface thereof, triangular first notches,and,serving as retraction-separation elements are respectively formed 135 and 315 degrees with respect to a direction toward a feeding point,from the center of the patch electrode,, which is defined as 0, and within the first notch,, a first adjustment electrode,extending outwardly from an edge of the patch electrode,is formed. On the other hand, a triangular second notch,is formed 45 degrees with respect to a direction toward the feeding point,from the center of the patch electrode,, which is defined as 0, and within the second notch,, a second adjustment electrode,extending outwardly from an edge of the patch electrode,is formed.