Variable directivity antenna and variable directivity...

Details Variable directivity antenna and variable directivity... Variable directivity antenna and variable directivity...

2005-08-23

2005-08-23

Lee, Wilson (Department: 2821)

Communications: radio wave antennas

Antennas

Balanced doublet - centerfed

Reexamination Certificate

active

06933907

ABSTRACT:
Folded dipole antenna elements (2, 4) are disposed generally in parallel, being spaced by a distance smaller than a quarter of the wavelength employed. The antenna elements (2, 4) are connected to a combiner (16) via feeders (12, 14) having different lengths. The difference in length between the feeders (12, 14) is such that received signals resulting from a radio wave coming to the antenna elements (2, 4) from the front and received by the antenna elements (12, 14) are in phase with each other at the inputs (16a, 16b) of the combiner (16), whereas received signals resulting from a radio wave coming to the antenna elements (2, 4) from the back and received by the antenna elements (12, 14) are 180° out of phase with each other at the inputs (16a, 16b) of the combiner (16). A variable phase device (18) is connected between one of the antenna elements (2, 4) and the combiner (16) to selectively couple the in-phase or 180° out of phase version of the received signal from that one antenna element to the combiner (16).

REFERENCES:
patent: 4122447 (1978-10-01), Kawai et al.
patent: 6809691 (2004-10-01), Yamamoto et al.
patent: 2004/0196202 (2004-10-01), Shirosaka et al.
patent: 2004/0196204 (2004-10-01), Shirosaka et al.
patent: SHO 63-38574 (1988-10-01), None

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