US5486836A
Expired / Lapsed
US
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Method, dual rectangular patch antenna system and radio for providing isolation and diversity
Assignee: Quarterhill Inc
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Filing: 1995-02-16
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Granted: 1996-01-23
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Expires: 2015-02-16
Abstract
Abstract The present invention provides a method, dual rectangular patch antenna system, and radio for providing isolation and diversity while eliminating the need for a diplexer or a second transmit/receive switch. The dual rectangular patch antenna system comprises a first rectangular patch antenna (202), a second rectangular patch antenna (204), and a switch (206). Receive path diversity is provided by switching between the first rectangular patch antenna (202) and the second rectangular patch antenna (204).
Inventors
- 👤 Stephen L. Kuffner
- 👤 Scott N. Carney
- 👤 Eric L. Krenz
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 16:26
CPC Classifications
H; H01; H01Q; H01Q1/00; H01Q1/12; H01Q1/22; H01Q1/24; H01Q1/241; H01Q1/242; H01Q1/243; H01Q1/52; H01Q1/521; H01Q1/525; H01Q3/00; H01Q3/24
Claims Analysis
Total Claims: 21
Claim 1
Independent Claim
263 words
A dual rectangular patch antenna system for providing isolation and diversity comprising: A) a first rectangular patch antenna having a substantially planar conductive rectangular first patch with four coplanar sides, a first midline orthogonal to a first side, and a second midline parallel to the first side and intersecting the first midline at a center of the first patch, wherein the first patch includes: A1) a first mode feedpoint, located on the first midline between the first side and the center of the first patch, for providing a first mode polarization, wherein the first mode feedpoint is connected to a transmit path; and A2) a second mode feedpoint, located on the second midline between a second side, adjacent to the first side, and the center of the first patch, for providing a second mode polarization orthogonal to the first mode polarization, wherein the first mode feedpoint and the second mode feedpoint are located such that an isolation is provided by a voltage null of the first mode polarization along the second midline and a voltage null of the second mode polarization along the first midline; B) a second rectangular patch antenna, spatially separated from the first rectangular patch antenna, having a substantially planar conductive rectangular second patch including a third mode feedpoint for providing a third mode polarization; and C) a switch, operably coupled to select one of the second mode feedpoint of the first rectangular patch antenna and the third mode feedpoint of the second rectangular patch antenna based on a predetermined signal quality, for providing spatial diversity in a receive path.
Claim 2
Dependent Claim
263 words
A dual rectangular patch antenna system for providing isolation and diversity comprising: A) a first rectangular patch antenna having a substantially planar conductive rectangular first patch with four coplanar sides, a first midline orthogonal to a first side, and a second midline parallel to the first side and intersecting the first midline at a center of the first patch, wherein the first patch includes: A1) a first mode feedpoint, located on the first midline between the first side and the center of the first patch, for providing a first mode polarization, wherein the first mode feedpoint is connected to a transmit path; and A2) a second mode feedpoint, located on the second midline between a second side, adjacent to the first side, and the center of the first patch, for providing a second mode polarization orthogonal to the first mode polarization, wherein the first mode feedpoint and the second mode feedpoint are located such that an isolation is provided by a voltage null of the first mode polarization along the second midline and a voltage null of the second mode polarization along the first midline; B) a second rectangular patch antenna, spatially separated from the first rectangular patch antenna, having a substantially planar conductive rectangular second patch including a third mode feedpoint for providing a third mode polarization; and C) a switch, operably coupled to select one of the second mode feedpoint of the first rectangular patch antenna and the third mode feedpoint of the second rectangular patch antenna based on a predetermined signal quality, for providing spatial diversity in a receive path.
Claim 3
Dependent Claim
36 words
The dual rectangular patch antenna system of claim 1, wherein the third mode polarization is orthogonal to the first mode polarization to provide signal isolation between a transmit and a receive path in a full-duplex system.
Claim 4
Dependent Claim
29 words
The dual rectangular patch antenna system of claim 1, wherein the third mode polarization is orthogonal to the second mode polarization to provide polarization diversity in the receive path.
Claim 5
Dependent Claim
176 words
The dual rectangular patch antenna system of claim 1, wherein the second patch has four coplanar sides, a third midline orthogonal to a first side of the second patch, and a fourth midline parallel to the first side of the second patch and intersecting the third midline at a center of the second patch, the second patch includes: B1) the third mode feedpoint, located on the third midline between the first side of the second patch and the center of the second patch, for providing a third mode polarization; and B2) a fourth mode feedpoint, located on the fourth midline between a second side, adjacent to the first side, of the second patch and the center of the second patch, for providing a fourth mode polarization orthogonal to the third mode polarization, wherein the third mode feedpoint and the fourth mode feedpoint are located such that an isolation is provided by a voltage null of the third mode polarization along the fourth midline and a voltage null of the fourth mode polarization along the third midline.
Claim 6
Dependent Claim
59 words
The dual rectangular patch antenna system of claim 4, wherein the system further comprises a second switch, operably coupled to select one of the first mode feedpoint of the first rectangular patch antenna and the fourth mode feedpoint of the second rectangular patch antenna based on a second predetermined signal quality, for providing spatial diversity in the transmit path.
Claim 7
Independent Claim
125 words
A method for providing isolation and diversity comprising: A) providing, by a first feed point on a first rectangular patch antenna, a first mode polarization connected to a transmit path; B) providing, by a second feedpoint on the first rectangular patch antenna, a second mode polarization orthogonal to the first mode polarization and isolated from the first mode polarization; C) providing, by a third feedpoint on a second rectangular patch antenna, a third mode polarization, wherein in the second rectangular patch antenna is spatially separated from the first rectangular patch antenna; and D) providing, by a switch, a selection of one of the second mode polarization and the third mode polarization based on a predetermined signal quality to provide spatial diversity in a receive path.
Claim 8
Independent Claim
125 words
A method for providing isolation and diversity comprising: A) providing, by a first feed point on a first rectangular patch antenna, a first mode polarization connected to a transmit path; B) providing, by a second feedpoint on the first rectangular patch antenna, a second mode polarization orthogonal to the first mode polarization and isolated from the first mode polarization; C) providing, by a third feedpoint on a second rectangular patch antenna, a third mode polarization, wherein in the second rectangular patch antenna is spatially separated from the first rectangular patch antenna; and D) providing, by a switch, a selection of one of the second mode polarization and the third mode polarization based on a predetermined signal quality to provide spatial diversity in a receive path.
Claim 9
Dependent Claim
33 words
The method of claim 6, wherein the third mode polarization is orthogonal to the first mode polarization to provide signal isolation between the transmit path and the receive path in a full-duplex system.
Claim 10
Dependent Claim
25 words
The method of claim 6, wherein the third mode polarization is orthogonal to the second mode polarization to provide polarization diversity in the receive path.
Claim 11
Dependent Claim
75 words
The method of claim 6, wherein the method further comprises: E) providing, by a fourth feedpoint on the second rectangular patch antenna, a fourth mode polarization orthogonal to the third mode polarization and isolated from the third mode polarization; and F) providing, by a second switch, a selection of one of the first mode polarization and the fourth mode polarization based on a second predetermined signal quality to provide spatial diversity in the transmit path.
Claim 12
Dependent Claim
463 words
A dual rectangular patch antenna system for providing isolation and diversity comprising: A) a first rectangular patch antenna having a substantially planar conductive rectangular first patch with four coplanar sides, a first midline orthogonal to a first side, and a second midline parallel to the first side and intersecting the first midline at a center of the first patch, wherein the first patch includes: A1) a first mode feedpoint, located on the first midline between the first side and the center of the first patch, for providing a first mode polarization, wherein the first mode feedpoint is connected to a transmit path; and A2) a second mode feedpoint, located on the second midline between a second side, adjacent to the first side, and the center of the first patch, for providing a second mode polarization orthogonal to the first mode polarization, wherein the first mode feedpoint and the second mode feedpoint are located such that an isolation is provided by a voltage null of the first mode polarization along the second midline and a voltage null of the second mode polarization along the first midline; B) a second rectangular patch antenna, spatially separated from the first rectangular patch antenna, having a substantially planar conductive rectangular second patch with four coplanar sides, a third midline orthogonal to a first side of the second patch, and a fourth midline parallel to the first side of the second patch and intersecting the third midline at a center of the second patch, wherein the second patch includes: B1) the third mode feedpoint, located on the third midline between the first side of the second patch and the center of the second patch, for providing a third mode polarization; and B2) a fourth mode feedpoint, located on the fourth midline between a second side, adjacent to the first side, of the second patch and the center of the second patch, for providing a fourth mode polarization orthogonal to the third mode polarization, wherein the third mode feedpoint and the fourth mode feedpoint are located such that an isolation is provided by a voltage null of the third mode polarization along the fourth midline and a voltage null of the fourth mode polarization along the third midline; C) a first switch, operably coupled to select one of the second mode feedpoint of the first rectangular patch antenna and the third mode feedpoint of the second rectangular patch antenna based on a predetermined signal quality, for providing spatial diversity in a receive path; and D) a second switch, operably coupled to select one of the first mode feedpoint of the first rectangular patch antenna and the fourth mode feedpoint of the second rectangular patch antenna based on a second predetermined signal quality, for providing spatial diversity in the transmit path.
Claim 13
Dependent Claim
463 words
A dual rectangular patch antenna system for providing isolation and diversity comprising: A) a first rectangular patch antenna having a substantially planar conductive rectangular first patch with four coplanar sides, a first midline orthogonal to a first side, and a second midline parallel to the first side and intersecting the first midline at a center of the first patch, wherein the first patch includes: A1) a first mode feedpoint, located on the first midline between the first side and the center of the first patch, for providing a first mode polarization, wherein the first mode feedpoint is connected to a transmit path; and A2) a second mode feedpoint, located on the second midline between a second side, adjacent to the first side, and the center of the first patch, for providing a second mode polarization orthogonal to the first mode polarization, wherein the first mode feedpoint and the second mode feedpoint are located such that an isolation is provided by a voltage null of the first mode polarization along the second midline and a voltage null of the second mode polarization along the first midline; B) a second rectangular patch antenna, spatially separated from the first rectangular patch antenna, having a substantially planar conductive rectangular second patch with four coplanar sides, a third midline orthogonal to a first side of the second patch, and a fourth midline parallel to the first side of the second patch and intersecting the third midline at a center of the second patch, wherein the second patch includes: B1) the third mode feedpoint, located on the third midline between the first side of the second patch and the center of the second patch, for providing a third mode polarization; and B2) a fourth mode feedpoint, located on the fourth midline between a second side, adjacent to the first side, of the second patch and the center of the second patch, for providing a fourth mode polarization orthogonal to the third mode polarization, wherein the third mode feedpoint and the fourth mode feedpoint are located such that an isolation is provided by a voltage null of the third mode polarization along the fourth midline and a voltage null of the fourth mode polarization along the third midline; C) a first switch, operably coupled to select one of the second mode feedpoint of the first rectangular patch antenna and the third mode feedpoint of the second rectangular patch antenna based on a predetermined signal quality, for providing spatial diversity in a receive path; and D) a second switch, operably coupled to select one of the first mode feedpoint of the first rectangular patch antenna and the fourth mode feedpoint of the second rectangular patch antenna based on a second predetermined signal quality, for providing spatial diversity in the transmit path.
Claim 14
Dependent Claim
29 words
The dual rectangular patch antenna system of claim 10, wherein the second mode polarization is orthogonal to the third mode polarization to provide polarization diversity in the receive path.
Claim 15
Dependent Claim
29 words
The dual rectangular patch antenna system of claim 10, wherein the first mode polarization is orthogonal to the fourth mode polarization to provide polarization diversity in the transmit path.
Claim 16
Independent Claim
190 words
A method for providing isolation and diversity comprising: A) providing, by a first feedpoint on a first rectangular patch antenna, a first mode polarization connected to a transmit path; B) providing, by a second feedpoint on the first rectangular patch antenna, a second mode polarization orthogonal to the first mode polarization and isolated from the first mode polarization; C) providing, by a third feedpoint on a second rectangular patch antenna, a third mode polarization, wherein in the second rectangular patch antenna is spatially separated from the first rectangular patch antenna; and D) providing, by a fourth feedpoint on the second rectangular patch antenna, a fourth mode polarization orthogonal to the third mode polarization and isolated from the third mode polarization; E) providing, by a first switch, a selection of one of the second mode polarization and the third mode polarization based on a predetermined signal quality to provide spatial diversity in a receive path; and F) providing, by a second switch, a selection of one of the first mode polarization and the fourth mode polarization based on a second predetermined signal quality to provide spatial diversity in the transmit path.
Claim 17
Independent Claim
190 words
A method for providing isolation and diversity comprising: A) providing, by a first feedpoint on a first rectangular patch antenna, a first mode polarization connected to a transmit path; B) providing, by a second feedpoint on the first rectangular patch antenna, a second mode polarization orthogonal to the first mode polarization and isolated from the first mode polarization; C) providing, by a third feedpoint on a second rectangular patch antenna, a third mode polarization, wherein in the second rectangular patch antenna is spatially separated from the first rectangular patch antenna; and D) providing, by a fourth feedpoint on the second rectangular patch antenna, a fourth mode polarization orthogonal to the third mode polarization and isolated from the third mode polarization; E) providing, by a first switch, a selection of one of the second mode polarization and the third mode polarization based on a predetermined signal quality to provide spatial diversity in a receive path; and F) providing, by a second switch, a selection of one of the first mode polarization and the fourth mode polarization based on a second predetermined signal quality to provide spatial diversity in the transmit path.
Claim 18
Dependent Claim
25 words
The method of claim 13, wherein the second mode polarization is orthogonal to the third mode polarization to provide polarization diversity in the receive path.
Claim 19
Dependent Claim
25 words
The method of claim 13, wherein the first mode polarization is orthogonal to the fourth mode polarization to provide polarization diversity in the transmit path.
Claim 20
Dependent Claim
472 words
A radio having a dual rectangular patch antenna system for providing isolation and diversity, the dual rectangular patch antenna system comprising: A) a first rectangular patch antenna having a substantially planar conductive rectangular first patch with four coplanar sides, a first midline orthogonal to a first side, and a second midline parallel to the first side and intersecting the first midline at a center of the first patch, wherein the first patch includes: A1) a first mode feedpoint, located on the first midline between the first side and the center of the first patch, for providing a first mode polarization, wherein the first mode feedpoint is connected to a transmit path; and A2) a second mode feedpoint, located on the second midline between a second side, adjacent to the first side, and the center of the first patch, for providing a second mode polarization orthogonal to the first mode polarization, wherein the first mode feedpoint and the second mode feedpoint are located such that an isolation is provided by a voltage null of the first mode polarization along the second midline and a voltage null of the second mode polarization along the first midline; B) a second rectangular patch antenna, spatially separated from the first rectangular patch antenna, having a substantially planar conductive rectangular second patch with four coplanar sides, a third midline orthogonal to a first side of the second patch, and a fourth midline parallel to the first side of the second patch and intersecting the third midline at a center of the second patch, wherein the second patch includes: B1) the third mode feedpoint, located on the third midline between the first side of the second patch and the center of the second patch, for providing a third mode polarization; and B2) a fourth mode feedpoint, located on the fourth midline between a second side, adjacent to the first side, of the second patch and the center of the second patch, for providing a fourth mode polarization orthogonal to the third mode polarization, wherein the third mode feedpoint and the fourth mode feedpoint are located such that an isolation is provided by a voltage null of the third mode polarization along the fourth midline and a voltage null of the fourth mode polarization along the third midline; C) a first switch, operably coupled to select one of the second mode feedpoint of the first rectangular patch antenna and the third mode feedpoint of the second rectangular patch antenna based on a predetermined signal quality, for providing spatial diversity in a receive path; and D) a second switch, operably coupled to select one of the first mode feedpoint of the first rectangular patch antenna and the fourth mode feedpoint of the second rectangular patch antenna based on a second predetermined signal quality, for providing spatial diversity in the transmit path.
Claim 21
Dependent Claim
472 words
A radio having a dual rectangular patch antenna system for providing isolation and diversity, the dual rectangular patch antenna system comprising: A) a first rectangular patch antenna having a substantially planar conductive rectangular first patch with four coplanar sides, a first midline orthogonal to a first side, and a second midline parallel to the first side and intersecting the first midline at a center of the first patch, wherein the first patch includes: A1) a first mode feedpoint, located on the first midline between the first side and the center of the first patch, for providing a first mode polarization, wherein the first mode feedpoint is connected to a transmit path; and A2) a second mode feedpoint, located on the second midline between a second side, adjacent to the first side, and the center of the first patch, for providing a second mode polarization orthogonal to the first mode polarization, wherein the first mode feedpoint and the second mode feedpoint are located such that an isolation is provided by a voltage null of the first mode polarization along the second midline and a voltage null of the second mode polarization along the first midline; B) a second rectangular patch antenna, spatially separated from the first rectangular patch antenna, having a substantially planar conductive rectangular second patch with four coplanar sides, a third midline orthogonal to a first side of the second patch, and a fourth midline parallel to the first side of the second patch and intersecting the third midline at a center of the second patch, wherein the second patch includes: B1) the third mode feedpoint, located on the third midline between the first side of the second patch and the center of the second patch, for providing a third mode polarization; and B2) a fourth mode feedpoint, located on the fourth midline between a second side, adjacent to the first side, of the second patch and the center of the second patch, for providing a fourth mode polarization orthogonal to the third mode polarization, wherein the third mode feedpoint and the fourth mode feedpoint are located such that an isolation is provided by a voltage null of the third mode polarization along the fourth midline and a voltage null of the fourth mode polarization along the third midline; C) a first switch, operably coupled to select one of the second mode feedpoint of the first rectangular patch antenna and the third mode feedpoint of the second rectangular patch antenna based on a predetermined signal quality, for providing spatial diversity in a receive path; and D) a second switch, operably coupled to select one of the first mode feedpoint of the first rectangular patch antenna and the fourth mode feedpoint of the second rectangular patch antenna based on a second predetermined signal quality, for providing spatial diversity in the transmit path.
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