US4866451A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Broadband circular polarization arrangement for microstrip array antenna
Assignee: Comsat Corp
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Filing: 1984-06-25
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Granted: 1989-09-12
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Expires: 2004-06-25
Abstract
Abstract The invention relates to a circular polarization (CP) technique and a microstrip array antenna implementing this technique. Using four microstrip radiating elements with proper phasing of the excitation in a 2×2 array configuration, the technique averages out the cross-polarized component of the radiation, generating circular polarization of high purity. The technique is broadband and capable of dual-polarized operation. The resultant 2×2 array can be used either independently as a CP radiator or as the building subarray for a larger array.
Inventors
- 👤 Chun-Hong H. Chen
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 10:58
CPC Classifications
H; H01; H01Q; H01Q9/00; H01Q9/04; H01Q9/0407; H01Q9/0428; H01Q21/00; H01Q21/06; H01Q21/061; H01Q21/065
Claims Analysis
Total Claims: 16
Claim 1
Independent Claim
41 words
A microstrip array antenna, comprising: a symmetric array of electromagnetically coupled patch pairs, and a feeding network for said patch pairs, said feeding network being arranged such that each of said patch pairs are excited at plural feedpoints in phase quadrature.
Claim 2
Dependent Claim
41 words
A microstrip array antenna, comprising: a symmetric array of electromagnetically coupled patch pairs, and a feeding network for said patch pairs, said feeding network being arranged such that each of said patch pairs are excited at plural feedpoints in phase quadrature.
Claim 3
Dependent Claim
18 words
An antenna as claimed in claim 1, wherein said array is equally excited at each said feed point.
Claim 4
Dependent Claim
17 words
An antenna as claimed in claim 1, wherein said feeding network is formed of stripline, or microstripline.
Claim 5
Dependent Claim
33 words
An antenna as claimed in claim 1, wherein each of said electromagnetically coupled patch pairs comprises a feeding patch, a radiating patch and a spacer of foam material arranged therebetween as a separator.
Claim 6
Dependent Claim
14 words
An antenna as claimed in claim 4, wherein said patches comprise a copper-clad laminate.
Claim 7
Dependent Claim
51 words
A circular polarization antenna, comprising: a symmetric array of individual antenna elements, and a feeding network for exciting each of said elements, wherein said elements each comprise a pair of electromagnetically coupled patches including a feeding patch connected to said feeding network, and a radiating patch spaced from said feeding patch.
Claim 8
Dependent Claim
51 words
A circular polarization antenna, comprising: a symmetric array of individual antenna elements, and a feeding network for exciting each of said elements, wherein said elements each comprise a pair of electromagnetically coupled patches including a feeding patch connected to said feeding network, and a radiating patch spaced from said feeding patch.
Claim 9
Dependent Claim
37 words
An antenna as claimed in claim 6, wherein said feeding patches are arranged in a first plane, and wherein said radiating patches are formed in a second plane spaced from said first plane by a separation distance.
Claim 10
Dependent Claim
20 words
An antenna as claimed in claim 6, wherein said feeding network is at least partially constituted of a coaxial line.
Claim 11
Dependent Claim
21 words
An antenna as claimed in claim 8, wherein said feeding patches are connected to said feeding network via a coaxial construction.
Claim 12
Dependent Claim
24 words
An antenna as claimed in claim 6, wherein each of said elements includes a first substrate which is etched to produce said radiating patch.
Claim 13
Dependent Claim
34 words
An antenna as claimed in claim 6, wherein said feeding patches and said radiating patches are circular, and wherein the diameter of said radiating patches is greater than the diameter of said feeding patches.
Claim 14
Independent Claim
51 words
A method of obtaining high purity broadband circular polarization, comprising; providing a plurality of broadband microstrip resonators; arranging said microstrip resonators in a symmetrical array; and exciting each of said resonators equally at each of plural feeding points so as to obtain averaging among phase lagging and phase leading radiation components.
Claim 15
Independent Claim
51 words
A method of obtaining high purity broadband circular polarization, comprising; providing a plurality of broadband microstrip resonators; arranging said microstrip resonators in a symmetrical array; and exciting each of said resonators equally at each of plural feeding points so as to obtain averaging among phase lagging and phase leading radiation components.
Claim 16
Dependent Claim
22 words
A method as claimed in claim 12, wherein each of said resonators is formed of a pair of electromagnetically coupled spaced patches.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1992-09-11 | 1993-03-13 | 1993-09-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1996-09-11 | 1997-03-13 | 1997-09-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2000-09-11 | 2001-03-13 | 2001-09-12 | $7700.00 | Window Closed / Lapsed |