US3922683A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Three frequency band antenna
Assignee: BAE Systems Aerospace Inc
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Filing: 1974-06-24
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Granted: 1975-11-25
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Expires: 1994-06-24
Abstract
Abstract Disclosed is an antenna for radiating wave energy signals in three frequency bands. Signals having frequencies in the first and third bands are radiated by a first radiator. Signals having frequencies in the second, intermediate frequency band are radiated by a second radiator. The impedance characteristics of the radiators are used to selectively couple signals from the input to the appropriate radiator.
Inventors
- 👤 Richard J Kumpebeck
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 15:27
CPC Classifications
H; H01; H01Q; H01Q5/00; H01Q5/40; H01Q5/48
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
210 words
An antenna for radiating wave energy signals in first, second and third frequency bands, said second frequency band being intermediate to said first and third frequency bands, comprising: an input port; first means, responsive to wave energy signals supplied to said input port for radiating substantially only those signals which lie within said first and third frequency bands, said first means including a first combination of a double-tuned radiator and a first transmission line coupling said radiator to said input port, said combination presenting a substantially matched impedance at said input port for signals in said first and third frequency bands and presenting a substantially mismatched impedance at said input port for signals in said second frequency band; and second means, responsive to wave energy signals supplied to said input port for radiating substantially only those signals which lie within said second frequency band, said second means including a single-tuned radiator and second transmission line coupling said single-tuned radiator to said input port, said combination presenting a substantially matched impedance at said input port for signals in said second frequency band and presenting a substantially mismatched impedance at said input port for signals in said first and third frequency bands for radiating signals which lie within said second frequency band.
Claim 2
Dependent Claim
210 words
An antenna for radiating wave energy signals in first, second and third frequency bands, said second frequency band being intermediate to said first and third frequency bands, comprising: an input port; first means, responsive to wave energy signals supplied to said input port for radiating substantially only those signals which lie within said first and third frequency bands, said first means including a first combination of a double-tuned radiator and a first transmission line coupling said radiator to said input port, said combination presenting a substantially matched impedance at said input port for signals in said first and third frequency bands and presenting a substantially mismatched impedance at said input port for signals in said second frequency band; and second means, responsive to wave energy signals supplied to said input port for radiating substantially only those signals which lie within said second frequency band, said second means including a single-tuned radiator and second transmission line coupling said single-tuned radiator to said input port, said combination presenting a substantially matched impedance at said input port for signals in said second frequency band and presenting a substantially mismatched impedance at said input port for signals in said first and third frequency bands for radiating signals which lie within said second frequency band.
Claim 3
Dependent Claim
80 words
An antenna system as specified in claim 1 wherein: said first combination presents a substantially higher impedance at said input port for signals in said second frequency band than in said first and third frequency bands; said second combination presents a substantially higher impedance at said input port for signals in said first and third frequency bands than in said second frequency band; and said first and second means for radiating signals are connected across said input port in parallel.
Claim 4
Dependent Claim
210 words
An antenna for radiating wave energy signals in first, second and third frEquency bands, said second frequency band being intermediate to said first and third frequency bands, comprising: an input port; a double-tuned radiator presenting a substantially matched impedance at its input for signals in said first and third frequency bands and a substantially mismatched impedance for signals in said second frequency band, for radiating substantially only supplied signals which lie within said first and third frequency bands; a single-tuned radiator presenting a substantially matched impedance at its input for signals in said second frequency band and a substantially mismatched impedance for signals in said first and third frequency bands, for radiating substantially only supplied signals which lie within said second frequency band; means for coupling said double-tuned radiator to said input port such that the combination thereof presents a substantially higher impedance at said input port for supplied signals in said second frequency band than for supplied signals in said first and third frequency bands; and means for coupling said single-tuned radiator to said input port such that the combination thereof presents a substantially higher impedance at said input port for supplied signals in said first and third frequency bands than for supplied signals in said second frequency band.
Claim 5
Dependent Claim
210 words
An antenna for radiating wave energy signals in first, second and third frEquency bands, said second frequency band being intermediate to said first and third frequency bands, comprising: an input port; a double-tuned radiator presenting a substantially matched impedance at its input for signals in said first and third frequency bands and a substantially mismatched impedance for signals in said second frequency band, for radiating substantially only supplied signals which lie within said first and third frequency bands; a single-tuned radiator presenting a substantially matched impedance at its input for signals in said second frequency band and a substantially mismatched impedance for signals in said first and third frequency bands, for radiating substantially only supplied signals which lie within said second frequency band; means for coupling said double-tuned radiator to said input port such that the combination thereof presents a substantially higher impedance at said input port for supplied signals in said second frequency band than for supplied signals in said first and third frequency bands; and means for coupling said single-tuned radiator to said input port such that the combination thereof presents a substantially higher impedance at said input port for supplied signals in said first and third frequency bands than for supplied signals in said second frequency band.
Claim 6
Dependent Claim
48 words
An antenna as specified in claim 3 wherein said means for coupling said radiator to said input port comprises a transmission line having a first selected length, and said means for coupling said single-tuned radiator to said input port comprises a transmission line having a second selected length.
Claim 7
Dependent Claim
27 words
Apparatus as specified in claim 4 wherein said double-tuned radiator comprises a first dipole and said single-tuned radiator comprises a second dipole, perpendicular to said first dipole.
Claim 8
Dependent Claim
27 words
Apparatus as specified in claim 5 wherein said first and second transmission lines comprise coaxial cables and said cables are connected at said input port in parallel.
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) | 1978-11-24 | 1979-05-26 | 1979-11-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-11-24 | 1983-05-26 | 1983-11-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-11-24 | 1987-05-26 | 1987-11-25 | $7700.00 | Window Closed / Lapsed |