Communications: directive radio wave systems and devices (e.g. – Directive – Including a steerable array
Reexamination Certificate
2005-07-05
2005-07-05
Phan, Dao (Department: 3662)
Communications: directive radio wave systems and devices (e.g.,
Directive
Including a steerable array
Reexamination Certificate
active
06914558
ABSTRACT:
An antenna device (2a) includes first and second dipole antennas (4a, 6a) spaced from each other by a distance smaller than a quarter of a received wavelength. An antenna device (2b) includes third and fourth dipole antennas (4a, 6a) spaced from each other by the distance and is disposed orthogonal to the antenna device (2a). A first phase adjusting circuit (104a) combines signals from the first and second antennas (4a, 6a) 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 (104b) combines signals from the third and fourth antennas (4b, 6b) 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 (1136a, 1136b, 1138) combines signals from the first and second phase adjusting circuits (104a, 104b) after adjusting their signal levels to thereby provide an output signal exhibiting directivity oriented in a predetermined direction. The first phase adjusting circuit (104a) phase shifts the signal from one of the first and second antennas (4a, 6a) 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 (104b) phase shifts the signal from one of the third and fourth antennas (4b, 6b) 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.
REFERENCES:
patent: 3806930 (1974-04-01), Gobert
patent: 5585803 (1996-12-01), Miura et al.
patent: 6809691 (2004-10-01), Yamamoto et al.
patent: 2004/0196202 (2004-10-01), Shirosaka et al.
patent: SHO63-38574 (1988-10-01), None
Fujita Toshio
Shibuya Eiji
Shirosaka Toshiaki
Tatekawa Kiyotaka
Duane Morris LLP
DX Antenna Company Limited
Phan Dao
LandOfFree
Variable directivity antenna apparatus and receiver system... does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Variable directivity antenna apparatus and receiver system..., we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Variable directivity antenna apparatus and receiver system... will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-3414917