Patent ID: 7482993
Filing Date: 2009-01-27
Classification: H01Q

Abstract:
1. A variable-directivity antenna comprising feed elements, which are implemented as linear conductors running parallel to a Z-axis, and a passive element assembly, wherein the passive element assembly includes a number n (where n is a natural number that is equal to or greater than three) of linear passive elements that also run parallel to the Z-axis so as to surround the feed elements, and wherein each said passive element includes: a plurality of element pieces that are arranged parallel to the Z-axis; and at least one switching element of a first type that electrically connects selected ones of the element pieces to each other, and wherein the passive element assembly further includes at least one switching element of a second type that electrically connects two adjacent ones of the n passive elements to each other when turned ON but electrically disconnects the two adjacent passive elements from each other when turned OFF, and wherein the variable-directivity antenna changes its directivities by turning ON and OFF the at least one switching element of the first type and the at least one switching element of the second type, and wherein the switching elements of the first type are arranged on a first type of planar substrates, and wherein the switching elements of the second type are arranged on a second type of planar substrates, and wherein the element pieces are interposed between the first and second types of planar substrates, and wherein the feed elements run through respective through holes of the first type of planar substrates and respective through holes of the second type of planar substrates.