US3882393A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Communications system utilizing modulation of the characteristic polarizations of the ionosphere
Assignee: United States Department of the Navy
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Filing: 1973-06-04
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Granted: 1975-05-06
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Expires: 1993-06-04
Abstract
Abstract A system for high frequency ionospheric radio communication utilizing transmitting and receiving antenna polarizations which are adjusted to take into account specific properties of the ionospheric medium and comprising two sets of transmitters, receivers and antennas that send and receive polarized waves. Two channels of information can be received at a single RF transmitted frequency. An RF exciter circuit provides the excitation to two mixers each of which is driven by two signal sources. The outputs of the mixers are then amplified to drive the antennas.
Inventors
- 👤 Mark R Epstein
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 12:31
CPC Classifications
H; H04; H04B; H04B7/00; H04B7/02; H04B7/10; H04B14/00; H04B14/002; H04B14/008
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
171 words
A method of communicating by way of the ionosphere comprising the steps of: a. propagating a plurality of polarized radio frequency waves; b. polarizing said propagated waves at the transmitting location to correspond to the polarization of the characteristic waves for propagation along a ray path of the ionosphere in the region where the transmitted energy enters the ionosphere on its way to a receiving location; c. receiving said waves with receiving means which is polarized to correspond to the polarizations of the characteristic waves for propagation along the ray path of the ionosphere in the region where the electro-magnetic departs from the ionosphere in the direction proceeding towards the receiving station; d. wherein the polarization of at least one of the receiving antennas does not correspond to the characteristic polarization within the energy region of entry; and e. wherein the polarization of at least one of the transmitting antennas and at least one of the recieving antennas does not correspond to the characteristic polarization within the energy region of departure.
Claim 2
Independent Claim
171 words
A method of communicating by way of the ionosphere comprising the steps of: a. propagating a plurality of polarized radio frequency waves; b. polarizing said propagated waves at the transmitting location to correspond to the polarization of the characteristic waves for propagation along a ray path of the ionosphere in the region where the transmitted energy enters the ionosphere on its way to a receiving location; c. receiving said waves with receiving means which is polarized to correspond to the polarizations of the characteristic waves for propagation along the ray path of the ionosphere in the region where the electro-magnetic departs from the ionosphere in the direction proceeding towards the receiving station; d. wherein the polarization of at least one of the receiving antennas does not correspond to the characteristic polarization within the energy region of entry; and e. wherein the polarization of at least one of the transmitting antennas and at least one of the recieving antennas does not correspond to the characteristic polarization within the energy region of departure.
Claim 3
Dependent Claim
50 words
The method of claim 1 further comprising the steps of: a. transmitting a plan polarized radio frequency wave; and b. signaling by periodically connecting the polarization of said wave from one antenna, said antenna radiating a characteristically polarized wave to another antenna, said another antenna radiating another characteristically polarized wave.
Claim 4
Dependent Claim
42 words
The method recited in claim 2 wherein said signaling is performed by modulating the transmitted energy to one of said first and said second polarized antennas and processing said modulated energy precedent to applying said energy to the other characteristically polarized antenna.
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) | 1978-05-05 | 1978-11-04 | 1979-05-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-05-05 | 1982-11-04 | 1983-05-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-05-05 | 1986-11-04 | 1987-05-06 | $7700.00 | Window Closed / Lapsed |