Patent US4438437A successfully refreshed from Google Patents.
US4438437A
Expired / Lapsed
US
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Dual mode blade antenna
Assignee: HAZELINE Corp A CORP OF DE
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Filing: 1981-09-14
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Granted: 1984-03-20
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Expires: 2001-09-14
Abstract
Abstract A printed circuit board includes first and second antenna elements spaced less than one-quarter wavelength apart and preferably one-eighth wavelength apart. Matching circuitry printed on the circuit board connects the elements to a quadrature coupler. The circuit board is foam encased in a blade-shaped fiberglass radome. The antenna radiates two independent null-free patterns.
Inventors
- 👤 Patricia L. Burgmyer
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 14:34
CPC Classifications
H; H01; H01Q; H01Q1/00; H01Q1/27; H01Q1/28; H01Q1/282; H01Q1/283; H01Q25/00; H01Q25/005; H01Q3/00; H01Q3/24
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
108 words
An antenna for radiating a signal of given wavelength comprising: (a) a printed circuit board having first and second opposing sides; (b) first and second folded slat monopoles on the first side of said board and spaced apart by less than one-quarter of the given wavelength; (c) first and second microstrip feed lines on the second side of said board, said first line terminating in a first radiator port associated with said first monopole and said second line terminating in a second radiator port associated with said second monopole; and (d) means for applying in-phase and quadrature components of the signal to said first and second lines, respectively.
Claim 2
Dependent Claim
108 words
An antenna for radiating a signal of given wavelength comprising: (a) a printed circuit board having first and second opposing sides; (b) first and second folded slat monopoles on the first side of said board and spaced apart by less than one-quarter of the given wavelength; (c) first and second microstrip feed lines on the second side of said board, said first line terminating in a first radiator port associated with said first monopole and said second line terminating in a second radiator port associated with said second monopole; and (d) means for applying in-phase and quadrature components of the signal to said first and second lines, respectively.
Claim 3
Dependent Claim
20 words
The antenna of claim 1 wherein each said microstrip feed line includes a Tchebyscheff transformer connected to a terminating resistor.
Claim 4
Dependent Claim
22 words
The antenna of claim 2 wherein said monopoles are spaced apart, center-to-center, by an amount equal to one-eighth of the given wavelength.
Claim 5
Dependent Claim
91 words
The antenna of claim 1 wherein said means for applying comprises a quadrature coupler having a first input port, a second input port, an in-phase output port associated with said first line and a quadrature output port associated with said second line whereby said first and second monopoles in combination radiate a first pattern when the signal is applied to said first input port and said first and second monopoles in combination radiate a second pattern, independent of said first pattern, when the signal is applied to said second input port.
Claim 6
Dependent Claim
18 words
The antenna of claim 4 wherein said board is enclosed in a blade shaped fiberglass radome containing foam.
Claim 7
Dependent Claim
15 words
The antenna of claim 1 wherein said board is enclosed in a blade shaped radome.
References Cited (Backward Citations)
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1987-03-20 | 1987-09-19 | 1988-03-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1991-03-20 | 1991-09-19 | 1992-03-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1995-03-20 | 1995-09-19 | 1996-03-20 | $7700.00 | Window Closed / Lapsed |