Antenna apparatus and method for reducing background noise and increasing reception sensitivity
An antenna apparatus includes an electrically conductive section having peripheral edges, an antenna element coupled to the electrically conductive section, which transmits or receives electromagnetic signals, and an electromagnetic absorbing carbon material component. The carbon material component is generally disposed adjacent to the electrically conductive section, and includes a border region extending beyond the peripheral edges of the electrically conductive section. The carbon material component can be constructed of a carbon fiber fabric in which the carbon fibers are arranged to increase the effective signal to noise ratio of the antenna apparatus and enhance antenna performance without increasing the baseline power consumption level. The carbon fibers can be coated with silicone to insulate them externally while enhancing their lengthwise conductivity.
1. A carbon fiber fabric with enhanced mechanical and electromagnetic properties comprising:
a plurality of carbon fibers aligned to form one or more tows of the carbon fibers;
a coating of silicone on the carbon fibers which electrically insulates the carbon fibers individually;
the one or more tows of silicone-coated carbon fibers arranged to form a silicone-coated carbon fiber fabric;
the silicone-coated carbon fiber fabric having a specific sheet resistance of the carbon fibers of less than or equal to 100 ohms per centimeter squared; and
the carbon fiber fabric is bendable around a radius,
wherein the silicone-coated carbon fiber fabric attenuates background interference when positioned adjacent to an antenna element.
2. The carbon fiber fabric of claim 1 , wherein the silicone-coated carbon fiber fabric is sufficiently bendable to wrap around a cylinder having an outside diameter of about 5.0 mm.
3. The carbon fiber fabric of claim 1 , wherein the specific resistivity is equal to or less than 1.0 ohms per centimeter squared along the aligned, silicone-coated carbon fibers.
4. The carbon fiber fabric of claim 1 , wherein the silicone-coated carbon fibers are woven, non-woven, basket-woven, or aligned to form the silicone-coated carbon fiber fabric.
5. The carbon fiber fabric of claim 1 , wherein the enhanced mechanical properties comprise the ability to bend without breaking.
6. The carbon fiber fabric of claim 1 , wherein positioned adjacent to the antenna element includes positioned within one fourth a wavelength (λ/4) of a maximum wavelength signal communicated via the antenna element.
7. A carbon fiber fabric with enhanced mechanical and electromagnetic properties comprising:
a plurality of carbon fibers aligned to form one or more tows of the carbon fibers;
a coating of silicone on the carbon fibers which electrically insulates the carbon fibers individually;
the one or more tows of silicone-coated carbon fibers are arranged to form a silicone-coated carbon fiber fabric; and
the silicone-coated carbon fiber fabric having sufficient resistivity of the aligned silicone-coated carbon fibers to attenuate background interference when positioned adjacent to an antenna element.
8. The carbon fiber fabric of claim 7 , wherein the silicone-coated carbon fiber fabric is incorporated into a quilted fabric.
9. The carbon fiber fabric of claim 8 , wherein the quilted fabric comprises the silicone-coated carbon fiber fabric with at least one conductive layer.
10. The carbon fiber fabric of claim 8 , wherein the conductive layer is comprised of a metallic layer.
11. The carbon fiber fabric of claim 8 , wherein the conductive layer is comprised of a fabric containing conductive threads.
12. The carbon fiber fabric of claim 7 , wherein the silicone-coated carbon fiber fabric is arranged in a laminate with at least one metal layer.
13. The carbon fiber fabric of claim 7 , wherein the silicone-coated carbon fiber fabric is between at least two layers of conductive fabric.
14. The carbon fiber fabric of claim 7 , wherein positioned adjacent to the antenna element includes positioned within one fourth a wavelength (λ/4) of a maximum wavelength signal communicated via the antenna element.