Multiple Antennas Having Good Isolation Disposed In A Limited Space

Abstract

An apparatus and method are taught for instantiation of a plurality of high-frequency antennas in a limited space in a manner that provides good isolation. The instantiation may include relative rotations of linear conductors, mirror images, as well as horizontally and vertically polarized antennas. In one embodiment, the antennas may be multi-band antennas.

Description

BRIEF DESCRIPTION OF THE FIGURES

FIGS. 1A and 1B illustrate a top view of an exemplary portion of a printed circuit board (PCB) having a planar antenna formed on the PCB as well as two inverted-F antennas mounted on the PCB.

FIG. 2 illustrates a view of the PCB with mounted inverted-F antennas as well as ancillary circuitry. For simplicity, only the mounted inverted-F antennas are shown with a slight perspective form.

FIG. 3 illustrates an exemplary planar antenna formed on a PCB layer.

FIGS. 4A, 4B, and 4C illustrate side, top, and flat views of an exemplary inverted-F dual band antenna providing dual-band functionality.

Claims

1. A method of disposing antennas in a limited space, the antennas having good isolation, the method comprising: instantiating at least one horizontally polarized antenna on a PCB surface;instantiating at least one vertically polarized antenna above the PCB surface; andpositioning the vertically polarized antenna to enhance isolation relative to the horizontally polarized antenna.

2. The method of claim 1, wherein positioning the vertically polarized antenna includes rotating linear conductors of the vertically polarized antenna relative to a linear conductor of the horizontally polarized antenna.

3. The method of claim 1, wherein instantiating at least one vertically polarized antenna includes instantiating a first vertically polarized antenna and a second vertically polarized antenna.

4. The method of claim 3, further including positioning each of the first and second vertically polarized antennas to enhance isolation relative to the horizontally polarized antenna, wherein positioning each of the first and second vertically polarized antennas includes rotating linear conductors of each vertically polarized antenna relative to a linear conductor of the horizontally polarized antenna.

5. The method of claim 4, wherein positioning the first and second vertically polarized antennas includes positioning the second vertically polarized antenna as a mirror image of the first vertically polarized antenna.

6. The method of claim 4, wherein positioning the first and second vertically polarized antennas includes rotating linear conductors of the first vertically polarized antenna relative to linear conductors of the second vertically polarized antenna.

7. A wireless apparatus comprising: a horizontally polarized antenna disposed directly on a PCB surface; andat least one vertically polarized antenna disposed above the PCB surface,wherein the horizontally polarized antenna and each vertically polarized antenna are further disposed so as to enhance isolation from each other.

8. The wireless apparatus of claim 7, wherein linear conductors of each vertically polarized antenna are rotated relative to a linear conductor of the horizontally polarized antenna.

9. The wireless apparatus of claim 7, the at least one vertically polarized antenna includes a first vertically polarized antenna and a second vertically polarized antenna.

10. The wireless apparatus of claim 9, wherein linear conductors of each vertically polarized antenna are rotated relative to a linear conductor of the horizontally polarized antenna.

11. The wireless apparatus of claim 10, wherein the second vertically polarized antenna is positioned as a mirror image of the first vertically polarized antenna.

12. The wireless apparatus of claim 10, wherein linear conductors of the first vertically polarized antenna are rotated relative to linear conductors of the second vertically polarized antenna.

13. The wireless apparatus of claim 12, wherein dimensions of the first and second vertically polarized antennas provide dual-band functionality.