Ground independent multi-band antenna assemblies
View Patent ↗According to various aspects, exemplary embodiments are disclosed of ground independent multi-band antenna assemblies. In an exemplary embodiment, a ground independent multi-band antenna assembly is operable within at least a first frequency range and a second frequency range different than the first frequency range. The antenna assembly generally includes an annular ground element, a feed element, a patch element, and a high band element. The feed element includes a feeding point and a shorting point electrically connected to the annular ground element. The patch element is electrically shorted to the annular ground element by the feed element. The high band element is electrically connected to the feed element.
1. An antenna assembly operable within at least a first frequency range and a second frequency range different than the first frequency range, the antenna assembly comprising:
an annular ground element;
a feed element including a feeding point and a shorting point electrically connected to the annular ground element, the feeding point is adjacent an edge portion of the feed element, the shorting point is spaced apart from the feeding point and the edge portion of the feed element, the feed element is coupled to the annular ground element such that the shorting point is closer to a center of the annular ground element than is the feeding point and such that the feeding point is closer to an edge of the annular ground element than is the shorting point;
a patch element electrically shorted to the annular ground element by the feed element; and
a high band element;
whereby the antenna assembly is ground independent when operating in the first and second frequency ranges.
2. The antenna assembly of claim 1 , further comprising a coaxial cable having an inner conductor soldered to the feeding point of the feed element, wherein the coaxial cable is electrically grounded to the annular ground element adjacent the feeding point and routed through a central opening of the annular ground element.
3. The antenna assembly of claim 1 , wherein
the feed element and the patch element each comprises electrically-conductive material on a dielectric substrate;
the patch element is coupled to and/or supported by an upper portion of the feed element such that the patch element is generally perpendicular to the feed element and generally parallel to the high band element and the annular ground element; and
the feed element is coupled to and/or supported by the annular ground element such that the feed element is generally perpendicular to the annular ground element.
4. The antenna assembly of claim 1 , wherein:
the feed element comprises electrically-conductive material on a front side of a dielectric substrate; and
the high band element comprises electrically-conductive material on a back side of the dielectric substrate.
5. The antenna assembly of claim 4 , further comprising solder pads on the front and back sides of the dielectric substrate, and wherein the high band element is electrically-connected to the electrically-conductive material on the front side of the dielectric substrate by the solder pads and solder on the solder pads.
6. The antenna assembly of claim 1 , further comprising a base and a radome having a low profile and coupled to the base, wherein the annular ground element, the feed element, the patch element, and the high band element are within an internal spaced cooperatively defined between the radome and the base.
7. The antenna assembly of claim 1 , wherein:
the high band element is configured to be operable for improving bandwidth of the second frequency range by introducing capacitance; and/or
the annular ground element enables tuning of the antenna assembly to have a larger bandwidth while also shifting resonance to a lower frequency.
8. A machine to machine antenna system comprising the antenna assembly of claim 1 .
9. An antenna assembly operable within at least a first frequency range and a second frequency range different than the first frequency range, the antenna assembly comprising:
an annular ground element;
a feed element including a feeding point and a shorting point electrically connected to the annular ground element;
a patch element electrically shorted to the annular ground element by the feed element; and
a high band element;
wherein:
the patch element is configured to be operable for providing basic resonances for the first and second frequency ranges; and
the high band element is configured to be operable as an additional radiating element and having capacitance for cancelling out inductance of the patch element, whereby the high band element is operable for improving bandwidth of the second frequency range by introducing capacitances;
whereby the antenna assembly is ground independent when operating in the first and second frequency ranges.
10. The antenna assembly of claim 9 , wherein:
the feeding point is adjacent an edge portion of the feed element;
the shorting point is spaced apart from the feeding point and the edge portion of the feed element;
the feed element is coupled to the annular ground element such that:
the shorting point is closer to a center of the annular ground element than is the feeding point; and
the feeding point is closer to an edge of the annular ground element than is the shorting point.
11. An antenna assembly operable within at least a first frequency range and a second frequency range different than the first frequency range, the antenna assembly comprising:
an annular ground element;
a feed element including a feeding point and a shorting point electrically connected to the annular ground element;
a patch element electrically shorted to the annular ground element by the feed element; and
a high band element;
whereby the antenna assembly is ground independent when operating in the first and second frequency ranges;
wherein the antenna assembly is not dependent on a separate external ground plane, whereby the antenna assembly is operable omnidirectionally with linear polarization in the first and second frequency ranges with a voltage standing wave ratio of 3:1 or less whether the antenna assembly is mounted to a dielectric, non-ground plane mounting surface or mounted to an electrically-conductive mounting surface operable as an electrically large ground plane.
12. An antenna assembly operable within at least a first frequency range and a second frequency range different than the first frequency range, the antenna assembly comprising:
an annular ground element;
a feed element including a feeding point and a shorting point electrically connected to the annular ground element;
a patch element electrically shorted to the annular ground element by the feed element; and
a high band element;
whereby the antenna assembly is ground independent when operating in the first and second frequency ranges;
wherein:
the first frequency range is from about 824 megahertz to about 894 megahertz;
the second frequency range is from about 1710 megahertz to about 2170 megahertz; and
the antenna assembly is ground independent such that the antenna assembly is operable with omnidirectional and linear polarization in the first and second frequency ranges with a voltage standing wave ratio of 3:1 or less whether mounted to a ground plane or a non-ground plane.
13. An antenna assembly operable within at least a first frequency range and a second frequency range different than the first frequency range, the antenna assembly comprising:
an annular ground element;
a feed element including a feeding point and a shorting point electrically connected to the annular ground element;
a patch element electrically shorted to the annular ground element by the feed element;
a high band element; and
a coaxial cable having an inner conductor soldered to the feeding point of the feed element, wherein the coaxial cable is electrically grounded to the annular ground element adjacent the feeding point and routed through a central opening of the annular ground element;
whereby the antenna assembly is ground independent when operating in the first and second frequency ranges;
wherein:
the annular ground element includes an integrally formed feature to which an outer braid of the coaxial cable is soldered;
the antenna assembly includes a single port through which the antenna assembly provides multi-band operation;
the antenna assembly further comprising a threaded mounting member for mounting the antenna assembly to a support surface; and
the coaxial cable is routed from the central opening of the annular ground element through a central opening of the threaded mounting member.
14. An antenna assembly operable within at least a first frequency range and a second frequency range different than the first frequency range, the antenna assembly comprising:
an annular ground element;
a feed element including a feeding point and a shorting point electrically connected to the annular ground element, the feed element is electrically connected to the annular ground element by solder on a solder pad on the shorting point;
a patch element electrically shorted to the annular ground element by the feed element, the patch element is electrically connected to the feed element by solder on solder pads of the patch element and solder pads of the feed element; and
a high band element;
whereby the antenna assembly is ground independent when operating in the first and second frequency ranges.
15. An antenna assembly operable within at least a first frequency range and a second frequency range different than the first frequency range, the antenna assembly comprising:
an annular ground element;
a feed element including a feeding point and a shorting point electrically connected to the annular ground element;
a patch element electrically shorted to the annular ground element by the feed element, the patch element includes slots configured for slidably receiving tabs along a top of the feed element, whereby the patch element and the feed element are aligned relative to each other and mechanically coupled by the tabs of the feed element within the slots of the patch element; and
a high band element;
wherein the annular ground element includes slots configured for slidably receiving tabs along a bottom of the feed element, whereby the feed element and the annular ground element are aligned relative to each other and mechanically coupled by the tabs of the feed element within the slots of the annular ground element; and
whereby the antenna assembly is ground independent when operating in the first and second frequency ranges.
16. The antenna assembly of claim 15 , wherein the high band element includes a slot configured for slidably receiving an edge portion of the feed element, the feed element includes a slot configured for slidably receiving an edge portion of the high band element, whereby the high band element and the feed element are aligned relative to each other and mechanically coupled by the edge portion of the high band element within the slot of the feed element and the edge portion of the feed element within the slot of the high band element.
17. An antenna assembly operable within at least a first frequency range and a second frequency range different than the first frequency range, the antenna assembly comprising:
an annular ground element;
a feed element including a feeding point and a shorting point electrically connected to the annular ground element;
a patch element electrically shorted to the annular ground element by the feed element; and
a high band element;
whereby the antenna assembly is ground independent when operating in the first and second frequency ranges;
wherein:
each of the feed element, the patch element, and the high band element comprises electrically-conductive material on a generally flat or planar dielectric substrate;
the patch element is coupled to and/or support by an upper portion of the feed element such that the patch element is generally perpendicular to the feed element and generally parallel to the high band element and the annular ground element;
the high band element is coupled to and/or supported by an edge portion of the feed element such that the high band element is generally perpendicular to the feed element and generally parallel to the patch element and the annular ground element; and
the feed element is coupled to and/or supported by the annular ground element such that the feed element is generally perpendicular to the annular ground element.
18. The antenna assembly of claim 17 , wherein:
the patch element includes slots configured for slidably receiving tabs along the upper portion of the feed element;
the annular ground element includes slots configured for slidably receiving tabs along a lower portion of the feed element;
the high band element includes a slot configured for slidably receiving the edge portion of the feed element, the feed element includes a slot configured for slidably receiving an edge portion of the high band element.