Antenna assemblies for wireless communication devices
An antenna assembly for a cellular telephone, includes a solid dielectric core, and a two-terminal balanced antenna assembly, including an electrical conductor on the solid dielectric core; the electrical conductor being configured and dimensioned to be matched to the operating frequency band of the cellular telephone communication band and terminating at each of its opposite ends in a common feed point connection such as to provide a two-terminal balanced antenna assembly having an isotropic radiation pattern and reduced electromagnetic field radiation. In two described embodiments, the electrical conductor is configured to define two orthogonal coils; and in a third described embodiment, it is configured to define an electrically-conductive wire extending axially through the core, and an electrically-conductive helix extending around the outer surface.
1. An antenna assembly for a cellular telephone, comprising: a solid dielectric core, and a two-terminal balanced antenna assembly including an electrical conductor on said solid dielectric core; said electrical conductor being configured and dimensioned to be matched to the operating frequency band of the cellular telephone communication band and terminating at each of its opposite ends in a common feed point connection such as to provide a two-terminal balanced antenna assembly having an isotropic radiation pattern and reduced electromagnetic field radiation.
2. The antenna assembly according to claim 1 , wherein said electrical conductor is configured to define a first electrically-conductive loop in a first plane, and a second electrically-conductive loop in a second plane orthogonal to said first plane; said first and second electrically-conductive loops being connected in series with said common feed point connection to provide said two-terminal balanced antenna assembly.
3. The antenna assembly according to claim 2 , wherein said first and second electrically-conductive loops are located and electrically connected such that: one-half of said first loop is in said first plane and is connected at one end to a first feed point connection; said second loop is fully in said second plane orthogonal to said first plane and is electrically connected at one end to the opposite end of said one-half of the first loop; and the remaining one-half of said first loop is in said first plane and is electrically connected between the opposite end of said second loop and a second feed point connection.
4. The antenna assembly according to claim 2 , wherein each of said loops is of a length equal to one-half the wavelength of a predetermined frequency within the operative frequency band of the antenna assembly, such that the antenna assembly is of one full wavelength.
5. The antenna assembly according to claim 2 , wherein each of said loops is of a length equal to one-quarter wavelength of a predetermined frequency within the operative frequency band of the antenna assembly, such that the antenna assembly is of a one-half wavelength.
6. The antenna assembly according to claim 2 , wherein each of said loops is of rectangular configuration.
7. The antenna assembly according to claim 2 , wherein each of said loops is of square configuration.
8. The antenna assembly according to claim 1 , wherein said electrical conductor is of flat cross-section.
9. The antenna assembly according to claim 1 , wherein said electrical conductor includes an electrically-conductive wire extending axially through said core, and an electrically-conductive helix extending around the outer surface of said core; one end of said electrically-conductive wire and one end of said electrically-conductive helix being electrically-connected together; the opposite ends of said electrically-conductive wire and said electrically-conductive helix constituting common feed terminals defining said common feed point connection.
10. The antenna assembly according to claim 9 , wherein said dielectric core is of a cylindrical configuration.
11. The antenna assembly according to claim 1 , wherein said solid dielectric core is a material selected from the group of aluminum oxide, aluminum nitride, silicon nitride, zirconium oxide, and a ferroelectric dielectric.
12. A two-terminal balanced antenna assembly for a transceiver of a wireless communication device, comprising: a first electrically-conductive loop in a first plane; a second electrically-conductive loop in a second plane orthogonal to said first plane; and a solid dielectric core; said first and second electrically-conductive loops being connected in series with a common feed point connection, to provide a two-terminal balanced antenna assembly having reduced electromagnetic field radiation from the body of a transceiver when attached thereto in comparison to a monopole antenna of comparable gain.
13. The antenna assembly according to claim 12 , wherein said first and second electrically-conductive loops are located and electrically connected such that: one-half of said first loop is in said first plane and is connected at one end to a first feed point connection; said second loop is fully in said second plane orthogonal to said first plane and is electrically connected at one end to the opposite end of said one-half of the first loop; and the remaining one-half of said first loop is in said first plane and is electrically-connected between the opposite end of said second loop and a second feed point connection.
14. An antenna assembly for a wireless communication device, comprising: a first electrically-conductive loop constituted of two half-loops both disposed in a first plane; and a second electrically-conductive loop disposed in a second plane orthogonal to said first plane and located between said two half loops; said first and second loops being connected together in series with a common feed point.
15. The antenna assembly according to claim 14 , wherein: one-half of said first loop is in said first plane and is connected at one end to a first feed point connection; said second loop is fully in said second plane orthogonal to said first plane and is electrically connected at one end to the opposite end of said one half-loop; and the other one-half of said first loop is in said first plane and is electrically-connected between the opposite end of said second loop and a second feed point connection.
16. The antenna assembly according to claim 14 , wherein said first and second loops enclose a block of a solid dielectric material.
17. The antenna assembly according to claim 14 , wherein each of said loops is of rectangular configuration.
18. A two-terminal balanced antenna assembly for a transceiver of a wireless communication device, comprising: a dielectric core; an electrically-conductive wire extending axially through said core; and an electrically-conductive helix extending of at least one complete helical turn around the outer surface of said core; one end of said electrically-conductive wire and one end of said of electrically-conductive helix being electrically-connected together; the opposite ends of said electrically-conductive wire and said electrically-conductive helix constituting common feed terminals, such as to provide a two-terminal balanced antenna assembly having reduced electromagnetic field radiation from the body of a transceiver when attached thereto in comparison to a monopole antenna of comparable gain.
19. The antenna assembly according to claim 18 , wherein said dielectric core is of a cylindrical configuration.
20. The antenna assembly according to claim 18 , wherein the dielectric material of said dielectric core is selected from the group of aluminum oxide, aluminum nitride, silicon nitride, zirconium oxide, and a ferroelectric dielectric.