Low-profile antenna structure

Details Low-profile antenna structure Low-profile antenna structure

2011-06-07

2011-06-07

Choi, Jacob Y (Department: 2821)

Communications: radio wave antennas

Antennas

Plural diverse-type antennas using same active element

C343S7000MS, C343S702000

Reexamination Certificate

active

07956815

ABSTRACT:
A low-profile antenna structure can control its directivity with great flexibility. Excited elements11and12are symmetrically arranged on a y-axis, whereas parasitic elements13and14are symmetrically arranged on an x-axis, with respect to an origin. The excited elements, as well as the parasitic elements, each have an inverted-F antenna structure and are a distance of λ/4 apart from each other. Feed circuits21and22are respectively connected to and feed signals to the excited elements11and12,such that phases of the signals to be fed are different from each other by a desired degree. Variable reactors23and24(i) are respectively connected to the parasitic elements13and14,and (ii) in accordance with reactance values thereof, can each change an electrical length of the corresponding one of the parasitic elements.

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