US 10,096,909 B2Granted

Multi-band monopole planar antennas configured to facilitate improved radio frequency (RF) isolation in multiple-input multiple-output (MIMO) antenna arrangement

AssigneeCorning Optical Communications Wireless Ltd

InventorsRonen Schwartzman, Yuval Tzur

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Abstract

Embodiments disclosed include multi-band monopole planar antennas configured to facilitate radio frequency (RF) isolation in multiple-input multiple-output (MIMO) antenna arrangement. In one aspect, a multi-band monopole planar antenna is provided and configured to generate a slant 45° radiation polarization in the lower frequency band. As a result, sufficient RF isolation may be achieved in the lower frequency band when a plurality of dual-band monopole planar antennas is placed in the MIMO arrangement. In another aspect, the multi-band monopole planar antenna is configured not to support certain unused RF bands, thus facilitating height reduction in the multi-band monopole planar antenna. By configuring the dual-band monopole planar antenna to generate the slant-45 radiation polarization in the lower frequency band, a plurality of the multi-band monopole planar antennas may be placed in close proximity to each other to support MIMO operation without compromising RF performance.

Claims20

Dependent claims

A dual-band monopole planar antenna, comprising:

a semi-elliptical shaped conductive disc having a symmetrical center axis;
a slot disposed in the semi-elliptical shaped conductive disc along a longitudinal axis substantially perpendicular to the symmetrical center axis to separate the semi-elliptical shaped conductive disc into a first conductive disc section and a second conductive disc section;
a conductive delay line having a first end feed point and a second end feed point disposed in the slot, wherein the first end feed point is conductively coupled to the first conductive disc section and the second end feed point is conductively coupled to the second conductive disc section;
and
a disc feed point disposed in the first conductive disc section, wherein the disc feed point is configured to receive an electrical current from an electrical current source;
wherein the conductive delay line is configured to receive the electrical current from the first conductive disc section at the first end feed point and provide the electrical current to the second conductive disc section at the second end feed point;
wherein the first conductive disc section is configured to radiate electromagnetic energy on a first radio frequency (RF) band with a first radiation polarization in response to receiving the electrical current from the disc feed point;
and
wherein the second conductive disc section is configured to radiate electromagnetic energy on a second RF band having lower frequency than the first RF band with a second radiation polarization different from the first radiation polarization in response to receiving the electrical current from the second end feed point of the conductive delay line.

6 more elements

A dual-band antenna element, comprising:

a first dual-band monopole planar antenna mounted on a first substrate;
and
a second dual-band monopole planar antenna mounted on a second substrate;
wherein the first dual-band monopole planar antenna and the second dual-band monopole planar antenna each comprises:
a respective semi-elliptical shaped conductive disc having a respective symmetrical center axis;
a respective slot disposed in the respective semi-elliptical shaped conductive disc along a respective longitudinal axis substantially perpendicular to the respective symmetrical center axis to separate the respective semi-elliptical shaped conductive disc into a respective first conductive disc section and a respective second conductive disc section;
a respective conductive delay line having a respective first end feed point and a respective second end feed point disposed in the respective slot, wherein the respective first end feed point is conductively coupled to the respective first conductive disc section and the respective second end feed point is conductively coupled to the respective second conductive disc section;
and
a respective disc feed point disposed in the respective first conductive disc section, wherein the respective disc feed point is configured to receive an electrical current from an electrical current source;
wherein the first substrate comprises a first slot opening disposed along the respective symmetrical center axis of the first dual-band monopole planar antenna;
wherein the second substrate comprises a second slot opening disposed along the respective symmetrical center axis of the second dual-band monopole planar antenna;
wherein the second slot opening of the second substrate receives the first substrate within the first slot opening to dispose the second dual-band monopole planar antenna substantially perpendicular to the first dual-band monopole planar antenna;
wherein the first dual-band monopole planar antenna and the second dual-band monopole planar antenna are electrically coupled along an intersection of the first substrate and the second substrate;
wherein the respective disc feed point of the first dual-band monopole planar antenna and the respective disc feed point of the second dual-band monopole planar antenna are electrically coupled to provide a common feed point for the dual-band antenna element;
and
wherein the first dual-band monopole planar antenna and the second dual-band monopole planar antenna are configured to each generate a cylinder-shaped slant 45° (slant-45) total electric field when the electrical current is received at the common feed point.

13 more elements

A multiple-input multiple-output (MIMO) antenna, comprising:

a planar mounting surface;
a first dual-band antenna element disposed on the planar mounting surface, wherein the first dual-band antenna element comprises at least one first dual-band monopole planar antenna having a first symmetrical center axis substantially perpendicular to the planar mounting surface and a first longitudinal axis substantially perpendicular to the first symmetrical center axis;
and
a second dual-band antenna element disposed on the planar mounting surface, wherein the second dual-band antenna element comprises at least one second dual-band monopole planar antenna having a second symmetrical center axis substantially perpendicular to the planar mounting surface and a second longitudinal axis substantially perpendicular to the second symmetrical center axis;
wherein the second dual-band antenna element is disposed on the planar mounting surface such that the second longitudinal axis is substantially aligned with the first longitudinal axis in the first dual-band antenna element.

2 more elements

Dependencies are inferred from the claim text.

Facts

Application: 15/473,977Filed 30 Mar 2017 · continuation
Priority: 3 Nov 2014
Published: US 2017/0207548 A120 Jul 2017
Granted: 9 Oct 2018
Term ends: Not estimatedThe source records don’t support an estimate.

Classification8 codes

H01Q 21/24
Antenna arrays or systems: combinations of antenna units polarised in different directions for transmitting or receiving circularly and…
H01Q 1/38
Structural form of radiating elements, e.g. cone, spiral, umbrella; Particular materials used therewith: formed by a conductive layer on an…
H01Q 1/523
Reducing the coupling between adjacent antennas: between antennas of an array
H01Q 5/30
Arrangements for simultaneous operation of antennas on two or more different wavebands, e.g. dual-band or multi-band arrangements: arrangements…