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US3845485A
Expired / Lapsed
US
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Non-rotating antenna
Assignee: TDK Micronas GmbH
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Filing: 1973-04-18
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Granted: 1974-10-29
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Expires: 1993-04-18
Abstract
Abstract This invention relates to a method of providing modulation within the distribution and mode generating cavity of a nonrotating antenna, which antenna radiates a rotating limacon radiation pattern. The H11 coaxial mode is induced in the distribution cavity by inhibiting or exciting currents to flow in certain ones of a plurality of probes arranged in a circle in the cavity. This is accomplished by means of switching devices incorporated into each of the probes and external digital logic for controlling the pattern of excitation. The excitation voltage for each probe is supplied by the normal TEM mode of the input carrier signal. Diodes are placed at the base of each probe so that with the appropriate bias voltage applied, RF current is controlled.
Inventors
- 👤 E Parker
- 👤 C Lucanera
- 👤 R Craine
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 10:50
CPC Classifications
H; H01; H01Q; H01Q25/00; H01Q25/04; G; G01; G01S; G01S1/00; G01S1/02; H01Q21/00; H01Q21/0006; H01Q21/0018; H01Q21/06; H01Q21/20; H01Q3/00; H01Q3/26; H01Q3/28
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
115 words
A method of modulating a transmitter carrier signal in the distribution cavity of a non-rotating antenna, which antenna produces a limacon radiation pattern comprising: injecting all of said transmitter carrier signal into the center conductor of an RF impedance transformer located within said distribution cavity; sequentially exciting, according to a predetermined pattern, a plurality of probes projecting into the distribution cavity to excite the H11 coaxial mode of propagation in the cavity; adjusting the phase of the RF currents in said excited probes to bring the resulting modulation component in phase with the carrier at a desired center frequency; and extracting signals having the desired amplitude and phase functions from the outputs of said transformer.
Claim 2
Independent Claim
115 words
A method of modulating a transmitter carrier signal in the distribution cavity of a non-rotating antenna, which antenna produces a limacon radiation pattern comprising: injecting all of said transmitter carrier signal into the center conductor of an RF impedance transformer located within said distribution cavity; sequentially exciting, according to a predetermined pattern, a plurality of probes projecting into the distribution cavity to excite the H11 coaxial mode of propagation in the cavity; adjusting the phase of the RF currents in said excited probes to bring the resulting modulation component in phase with the carrier at a desired center frequency; and extracting signals having the desired amplitude and phase functions from the outputs of said transformer.
Claim 3
Dependent Claim
15 words
A method according to claim 1 wherein said rotating limacon function is a rotating cardioid.
Claim 4
Dependent Claim
12 words
A method according to claim 1 wherein said probes are resistively loaded.
Claim 5
Dependent Claim
12 words
A method according to claim 1 wherein said probes are reactively loaded.
Claim 6
Dependent Claim
14 words
A method according to claim 1 wherein said probes are resistively and reactively loaded.
Claim 7
Dependent Claim
27 words
A method according to claim 1 wherein probes excited in succession are angularly displaced from each other to reduce excitation of higher modes within the distribution cavity.
Claim 8
Dependent Claim
12 words
A method according to claim 6 wherein said angular displacement is 45*.
References Cited (Backward Citations)
US3713167A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1977-10-28 | 1978-04-29 | 1978-10-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-10-28 | 1982-04-29 | 1982-10-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-10-28 | 1986-04-29 | 1986-10-29 | $7700.00 | Window Closed / Lapsed |