Modified printed dipole antennas for wireless multi-band communication systems
A dipole antenna for a wireless communication device, which includes a first conductive element superimposed on a portion of and separated from a second conductive element by a first dielectric layer. A first conductive via connects the first and second conductive elements through the first dielectric layer. The second conductive element is generally U-shaped. The second conductive element includes a plurality of spaced conductive strips extending transverse from adjacent ends of the legs of the U-shape. Each strip is dimensioned for a different center frequency λ 0 . The first conductive element may be replaced by a coaxial feed directly to the second conductive element.
1 . A dipole antenna for a wireless communication device comprising:
a first conductive element superimposed a portion of and separated from a second conductive element by a first dielectric layer;
a first conductive via connects the first and second conductive elements through the first dielectric layer;
the second conductive element being generally U-shaped;
the second conductive element including a plurality of spaced conductive strips extending transverse from adjacent ends of the legs of the U-shape;
at least one of the strips on each leg is T-shape;
at least one of the strips on each leg is other than a T-shape: and
each strip extending from a leg being dimensioned for a different λo than another strip of the leg.
2 . The antenna according to claim 1 , wherein the first conductive element is L-shaped.
3 . The antenna according to claim 2 , wherein one of the legs of the L-shape is superimposed one of the legs of the U-shape.
4 . The antenna according to claim 3 , wherein the first conductive via connects the other leg of the L-shape to the other leg of the U-shape.
5 . The antenna according to claim 2 , wherein the first conductive via connects an end of one of the legs of the L-shape to one of the legs of the U-shape.
6 . The antenna according to claim 1 , wherein the first and second conductive elements are each planar.
7 . The antenna according to claim 1 , wherein each strip has a width less than 0.05λo and a length of less than 0.5λo.
8 - 16 . (canceled)
17 . The antenna according to claim 1 , wherein the first dielectric layer is a substrate, and the first and second conductive elements are printed elements on the substrate.
18 . The antenna according to claim 1 , wherein the plurality of strips are parallel to each other.
19 . (canceled)
20 . (canceled)
21 . The antenna according to claim 57 , wherein the serpentine is sinusoidal.
22 . The antenna according to claim 57 , wherein the serpentine is triangular.
23 . The antenna according to claim 57 , wherein the serpentine is rectangular.
24 . (canceled)
25 . The antenna according to claim 1 , wherein at least one of the strips is generally shaped as a claw hammer.
26 - 33 . (canceled)
34 . A wireless communication device including the antenna of claim 1 .
35 . A dipole antenna for a wireless communication device comprising:
a generally U-shaped first conductive element on a first dielectric layer;
the first conductive element including a plurality of spaced conductive strips extending transverse from adjacent ends of the legs of the U-shape;
at lease one of the strips on each leg is T-shaped:
at least one of the strips on each leg, is other than a T-shape;
each strip extending from a leg being dimensioned for a different λo than another strip of the leg; and
a coaxial feed, having inner and outer conductors, each connected to a leg of the U-shape.
36 . The antenna according to claim 35 , wherein the first dielectric layer is a substrate, and the first conductive element is printed on the substrate.
37 . The antenna according to claim 35 , wherein the plurality of strips are parallel to each other.
38 . (canceled)
39 . (canceled)
40 . The antenna according to claim 58 , wherein the serpentine is sinusoidal.
41 . The antenna according to claim 58 , wherein the serpentine is triangular.
42 . The antenna according to claim 58 , wherein the serpentine is rectangular.
43 . (canceled)
44 . The antenna according to claim 35 , wherein at least one of the strips is generally shaped as a claw hammer.
45 - 52 . (canceled)
53 . The antenna according to claim 35 , including a second conductive element having first and second portions each superimposed the strips extending from one of the legs of the U-shape and separated there from by the first conductive layer.
54 . A wireless communication device including the antenna of claim 35 .
55 . (canceled)
56 . (canceled)
57 . A dipole antenna for a wireless communication device comprising:
a first conductive element superimposed a portion of and separated from a second conductive element by a first dielectric layer;
a first conductive via connects the first and second conductive elements through the first dielectric layer;
the second conductive element being generally U-shaped;
the second conductive element including a plurality of spaced conductive strips extending along an axis transverse from adjacent ends of the legs of the U-shape;
at least one of the strips on each leg being serpentine and curving along the axis; and
each strip extending from a leg being dimensioned for a different λo than another strip of the leg.
58 . A dipole antenna for a wireless communication device comprising:
a generally U-shaped first conductive element on a first dielectric layer;
the first conductive element including a plurality of spaced conductive strips extending transverse along an axis from adjacent ends of the legs of the U-shape;
at least one of the strips on each leg being serpentine and curving along the axis; and
each strip extending from a leg being and dimensioned for a different λo than another strip of the leg.