Mountable antenna elements for dual band antenna
View Patent ↗A mountable antenna element is constructed as an object from a single piece of material and can be configured to transmit and receive RF signals, achieve optimized impedance values, and operate in a concurrent dual-band system. The mountable antenna element may have one or more legs, an RF signal feed, and one or impedance matching elements. The legs and RF signal feed can be coupled to a circuit board. The impedance matching elements can be utilized to create a capacitance with a portion of the circuit board and thereby optimize impedance of the antenna element at a desired operating frequency. The mountable antenna includes features that enable it for use in concurrent dual band operation with the wireless device. Because the mountable antenna element can be installed without needing additional circuitry for matching impedance and can be constructed from a single piece of material, the antenna element provides for more efficient manufacturing.
1. A self-standing mountable antenna that transmits a radio frequency signal, the antenna comprising:
a top surface in a first plane, the top surface formed from a single sheet of material;
a radio frequency feed extending from the top surface and coupled to a radio frequency source;
a plurality of legs extending from the top surface and coupled to a ground plane; and
a first bendable impedance matching element extending from the top surface towards the ground plane, wherein the radio frequency feed, the legs, and the first bendable impedance matching element are all formed from the same single sheet of material as the top surface and are each bent downwardly therefrom towards the ground plane, and wherein the first bendable impedance matching element forms a capacitance with the ground plane that is determined by an adjustable spatial distance between a bottom edge of the first bendable impedance matching element and the ground plane, the spatial distance being adjustable by bending the first bendable impedance matching element with respect to the top surface.
2. The self-standing mountable antenna of claim 1 , further including a second bendable impedance matching element positioned symmetrically across from the first bendable impedance matching element.
3. The self-standing mountable antenna of claim 1 , wherein the mountable antenna is driven at a first frequency and the first bendable impedance matching element provides impedance matching at the first frequency.
4. The self-standing mountable antenna of claim 3 , further including a stub extending from the top surface and positioned proximate to one of the plurality of legs, the stub forming an open circuit with the proximate leg when the proximate leg is exposed to a broadcast signal at a second frequency.
5. The self-standing mountable antenna of claim 4 , wherein the length of the stub is about one-quarter of the wavelength of the second frequency.
6. The self-standing mountable antenna of claim 1 , wherein one of the plurality of legs includes a coupling plate coupled to a surface.
7. The self-standing mountable antenna of claim 1 , wherein one of the plurality of legs includes a leg pin received by an aperture in a surface.
8. The self-standing mountable antenna of claim 1 , wherein the mountable antenna element is vertically polarized.
9. A wireless device that transmits a radiation signal, comprising:
a circuit board that receives a mountable antenna element, the mountable antenna element emitting a radiation signal at a first frequency;
a first mountable antenna coupled to the circuit board, wherein the first mountable antenna includes:
a radio frequency feed,
a top surface formed from a single sheet of material,
a plurality of legs coupling the first mountable antenna to the circuit board, and
a bendable impedance matching element forming a capacitance with respect to a ground layer of the circuit board by extending from the first mountable antenna towards the ground layer such that the capacitance is determined by an adjustable spatial distance between a bottom edge of the bendable impedance matching element and the ground plane, the spatial distance being adjustable by bending the bendable impedance matching element with respect to the top surface, wherein the radio frequency feed, the top surface, the plurality of legs, and the impedance matching element are all formed from the same single sheet of material as the top surface and are each bent downwardly therefrom towards the ground plane; and
a radio modulator/demodulator providing a radio frequency signal to the first mountable antenna at the first frequency.
10. The wireless device of claim 9 , further comprising a reflector coupled to the circuit board and reflecting a radiation pattern of the first mountable antenna.
11. The wireless device of claim 10 , wherein the reflector includes a coupling plate that couples to a mounting pad of the circuit board.
12. The wireless device of claim 10 , wherein the circuit board includes an aperture, the aperture receiving the reflector.
13. The wireless device of claim 9 , further comprising a second mountable antenna that emits a radiation signal at a second frequency.
14. The wireless device of claim 9 , the first mountable antenna including a stub able to generate an open circuit with respect to the second frequency at a leg of the plurality of legs of the first mountable antenna.
15. The wireless device of claim 14 , wherein the first mountable antenna includes a first stub with an outer end and a second stub with an outer end, the open circuit formed at the leg adjacent to the outer ends of the first stub and the second stub.
16. The wireless device of claim 10 , wherein the second mountable antenna radiates at a higher frequency than the first mountable antenna.