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. 05, 2005
Filed:
Oct. 29, 2004
Toshiaki Shirosaka, Kobe, JP;
Toshio Fujita, Kobe, JP;
Kiyotaka Tatekawa, Kobe, JP;
Eiji Shibuya, Kobe, JP;
Toshiaki Shirosaka, Kobe, JP;
Toshio Fujita, Kobe, JP;
Kiyotaka Tatekawa, Kobe, JP;
Eiji Shibuya, Kobe, JP;
DX Antenna Company, Limited, Kobe, JP;
Abstract
An antenna device () includes first and second dipole antennas () spaced from each other by a distance smaller than a quarter of a received wavelength. An antenna device () includes third and fourth dipole antennas () spaced from each other by the distance and is disposed orthogonal to the antenna device (). A first phase adjusting circuit () combines signals from the first and second antennas () after adjusting their phases, in such a manner that the resultant combined signal selectively assumes a forward directivity state exhibiting a forward directivity and a backward directivity state exhibiting a backward directivity. Similarly, a second phase adjusting circuit () combines signals from the third and fourth antennas () after adjusting their phases, in such a manner that the resultant combined signal selectively assumes a rightward directivity state exhibiting a rightward directivity and a leftward directivity state exhibiting a leftward directivity. Signal combining circuits () combines signals from the first and second phase adjusting circuits () after adjusting their signal levels to thereby provide an output signal exhibiting directivity oriented in a predetermined direction. The first phase adjusting circuit () phase shifts the signal from one of the first and second antennas () by a predetermined amount to provide the forward directivity state, or phase shifts the signal from the other of the first and second antennas by the predetermined amount to provide the backward directivity state. The second phase adjusting circuit () phase shifts the signal from one of the third and fourth antennas () by a predetermined amount to provide the leftward directivity state, or phase shifts the signal from the other of the third and fourth antennas by the predetermined amount to provide the rightward directivity state.