Patent US6694697B2 successfully refreshed from Google Patents.
US6549166B2
Expired / Lapsed
US
⏱️ 0.0 years remaining
Four-port patch antenna
Assignee: Boeing Co
•
Filing: 2001-08-22
•
Granted: 2003-04-15
•
Expires: 2021-08-22
Abstract
Abstract A patch antenna is disclosed having four ports for circular polarization that suppress the TM-02 mode, resulting in a radiation pattern that is symmetric. The axial ratio performance is consequently superior to that of two-port patch antennas. A four-port patch antenna includes a patch made of an electrically conductive material, a patch substrate coupled to the patch wherein the patch substrate is made of a dielectric material, a ground plane coupled to the patch substrate wherein the ground plane is made of an electrically conductive material having at least four slots formed therein, a feed substrate coupled to the ground plane wherein the feed substrate is made of a dielectric material, and a hybrid network coupled to the feed substrate that includes a right hand circularly polarized port, a left hand circularly polarized port, and two matched terminated ports.
Inventors
- 👤 Arun Bhattacharyya
- 👤 Alan Cha
- 👤 James McKay
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 03:24
CPC Classifications
H; H01; H01Q; H01Q21/00; H01Q21/06; H01Q21/061; H01Q21/065; H01Q9/00; H01Q9/04; H01Q9/0407; H01Q9/0428; H01Q9/0435; H01Q9/045; H01Q9/0457
Claims Analysis
Total Claims: 21
Claim 1
Independent Claim
121 words
A patch antenna comprising: a patch made of an electrically conductive material; a patch substrate coupled to the patch wherein the patch substrate is made of an electrically insulating material; a ground plane coupled to the patch substrate wherein the ground plane is made of an electrically conductive material having at least four slots formed therein; a feed substrate coupled to the ground plane wherein the feed substrate is made of an electrically insulating material; and a hybrid network coupled to the feed substrate wherein the hybrid network comprises: a right hand circularly polarized port; a left hand circularly polarized port; and two matched terminated ports coupled to the right hand circularly polarized port and the left hand circularly polarized port.
Claim 2
Dependent Claim
121 words
A patch antenna comprising: a patch made of an electrically conductive material; a patch substrate coupled to the patch wherein the patch substrate is made of an electrically insulating material; a ground plane coupled to the patch substrate wherein the ground plane is made of an electrically conductive material having at least four slots formed therein; a feed substrate coupled to the ground plane wherein the feed substrate is made of an electrically insulating material; and a hybrid network coupled to the feed substrate wherein the hybrid network comprises: a right hand circularly polarized port; a left hand circularly polarized port; and two matched terminated ports coupled to the right hand circularly polarized port and the left hand circularly polarized port.
Claim 3
Dependent Claim
40 words
The patch antenna of claim 1 wherein the hybrid network further comprises a 0° port, a 90° port, a 180° port, and a 270° port coupled to the right hand circularly polarized port and the left hand circularly polarized port.
Claim 4
Dependent Claim
26 words
The patch antenna of claim 2 further comprising feed lines coupled respectively to the 0° port, the 90° port, the 180° port, and the 270° port.
Claim 5
Dependent Claim
14 words
The patch antenna of claim 3 wherein the feed lines have substantially equal length.
Claim 6
Dependent Claim
18 words
The patch antenna of claim 1 wherein the feed substrate has a dielectric constant of at least 9.
Claim 7
Dependent Claim
19 words
The patch antenna of claim 1 wherein the patch substrate has a dielectric constant of no more than 2.5.
Claim 8
Dependent Claim
125 words
A phased array antenna for a communications system comprising: a patch made of an electrically conductive material; a patch substrate coupled to the patch wherein the patch substrate is made of a dielectric material; a ground plane coupled to the patch substrate wherein the ground plane is made of an electrically conductive material in which at least four slots are formed; a feed substrate coupled to the ground plane wherein the feed substrate is made of a dielectric material; and a hybrid network coupled to the feed substrate wherein the hybrid network comprises: a right hand circularly polarized port; a left hand circularly polarized port; and two matched terminated ports coupled to the right hand circularly polarized port and the left hand circularly polarized port.
Claim 9
Dependent Claim
125 words
A phased array antenna for a communications system comprising: a patch made of an electrically conductive material; a patch substrate coupled to the patch wherein the patch substrate is made of a dielectric material; a ground plane coupled to the patch substrate wherein the ground plane is made of an electrically conductive material in which at least four slots are formed; a feed substrate coupled to the ground plane wherein the feed substrate is made of a dielectric material; and a hybrid network coupled to the feed substrate wherein the hybrid network comprises: a right hand circularly polarized port; a left hand circularly polarized port; and two matched terminated ports coupled to the right hand circularly polarized port and the left hand circularly polarized port.
Claim 10
Dependent Claim
41 words
The phased array antenna of claim 7 wherein the hybrid network further comprises a 0° port, a 90° port, a 180° port, and a 270° port coupled to the right hand circularly polarized port and the left hand circularly polarized port.
Claim 11
Dependent Claim
27 words
The phased array antenna of claim 8 further comprising feed lines coupled respectively to the 0° port, the 90° port, the 180° port, and the 270° port.
Claim 12
Dependent Claim
15 words
The phased array antenna of claim 9 wherein the feed lines have substantially equal length.
Claim 13
Dependent Claim
19 words
The phased array antenna of claim 7 wherein the feed substrate has a dielectric constant of at least 9.
Claim 14
Dependent Claim
20 words
The phased array antenna of claim 7 wherein the patch substrate has a dielectric constant of no more than 2.5.
Claim 15
Dependent Claim
86 words
A patch antenna comprising: a patch made of an electrically conductive material; a patch substrate coupled to the patch wherein the patch substrate is made of an electrically insulating material; a ground plane coupled to the patch substrate wherein the ground plane is made of an electrically conductive material; at least four slots formed in the ground plane; a feed substrate coupled to the ground plane wherein the feed substrate is made of an electrically insulating material; and a hybrid network coupled to the feed substrate.
Claim 16
Dependent Claim
86 words
A patch antenna comprising: a patch made of an electrically conductive material; a patch substrate coupled to the patch wherein the patch substrate is made of an electrically insulating material; a ground plane coupled to the patch substrate wherein the ground plane is made of an electrically conductive material; at least four slots formed in the ground plane; a feed substrate coupled to the ground plane wherein the feed substrate is made of an electrically insulating material; and a hybrid network coupled to the feed substrate.
Claim 17
Dependent Claim
43 words
The patch antenna of claim 13 wherein each of the at least four slots comprises an inside edge and an outside edge wherein the inside edge extends lengthwise parallel to the outside edge between the outside edge and a center of the patch.
Claim 18
Dependent Claim
22 words
The patch antenna of claim 14 wherein each of the at least four slots is centered on a side of the patch.
Claim 19
Dependent Claim
18 words
The patch antenna of claim 15 wherein the inside edge is parallel to a side of the patch.
Claim 20
Dependent Claim
28 words
The patch antenna of claim 16 wherein the inside edge of each of the at least four slots is about 2.3 cm from the center of the patch.
Claim 21
Dependent Claim
44 words
The patch antenna of claim 17 wherein the inside edge of each of the at least four slots has a length of 2.94 cm and a width of 0.2 cm within a tolerance of 0.003 cm corresponding to a center frequency of 2 GHz.
References Cited (Backward Citations)
US4903033A
Cited
US5223848A
Cited
US5043738A
Cited
US5124713A
Cited
US5241321A
Cited
US5880694A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 2006-04-14 | 2006-10-14 | 2007-04-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2010-04-14 | 2010-10-14 | 2011-04-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2014-04-14 | 2014-10-14 | 2015-04-15 | $7700.00 | Window Closed / Lapsed |