VARIABLE DIRECTIONAL ANTENNA DEVICE
A feed element is configured to include a first antenna element having a first width, a dual-band forming inductor, and a second antenna element having a second width wider than the first width, where the first antenna element, the dual-band forming inductor, and a second antenna element are connected in series. The inductor is formed in a meander shape which has a trapezoidal envelope external shape to have a width formed to widen from the first width of a portion connected to the first antenna element toward a portion connected to the second antenna element.
1 - 4 . (canceled)
5 . A variable directivity antenna apparatus comprising:
one feed element; and
at least one parasitic element provided to be aligned with and electromagnetically close to the feed element, the parasitic element having one end connected to one end of a diode having grounded another end,
wherein a directivity of the variable directivity antenna apparatus is changed by turning on and off the diode,
wherein the feed element comprises:
a first antenna element having a first width;
a dual-band forming inductor; and
a second antenna element having a second width wider than the first width,
wherein the first antenna element, the dual-band forming inductor, and the second antenna element are connected in series with each other, and
wherein the dual-band forming inductor is formed in a meander shape to have a trapezoidal envelope external shape having a width formed to widen from the first width of a portion connected to the first antenna element toward a portion connected to the second antenna element.
6 . The variable directivity antenna apparatus as claimed in claim 5 ,
wherein the second antenna element is formed to have the second width larger than a length in a longitudinal direction of the second antenna element.
7 . The variable directivity antenna apparatus as claimed in claim 5 , further comprising:
two parasitic elements provided to be aligned with each other so that the feed element is interposed between the two parasitic elements.
8 . The variable directivity antenna apparatus as claimed in claim 6 , further comprising:
two parasitic elements provided to be aligned with each other so that the feed element is interposed between the two parasitic elements.
9 . The variable directivity antenna apparatus as claimed in claim 5 ,
wherein a cut portion having a rectangular shape is further formed at a corner portion of another end of the parasitic element.
10 . The variable directivity antenna apparatus as claimed in claim 6 ,
wherein a cut portion having a rectangular shape is further formed at a corner portion of another end of the parasitic element.
11 . The variable directivity antenna apparatus as claimed in claim 7 ,
wherein a cut portion having a rectangular shape is further formed at a corner portion of another end of the parasitic element.
12 . The variable directivity antenna apparatus as claimed in claim 8 ,
wherein a cut portion having a rectangular shape is further formed at a corner portion of another end of the parasitic element.