US3906507A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Combination glideslope/localizer antenna for aircraft
Assignee: Lockheed Martin Corp
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Filing: 1974-03-27
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Granted: 1975-09-16
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Expires: 1994-03-27
Abstract
Abstract A combination glideslope/localizer antenna suitable for mounting on the forward bulkhead in the radome area of an aircraft provides two suitably isolated connectors for receiving glideslope and localizer signals for the aircraft instrument landing system. The two radiating elements are a special arrangement of split loops, making use of microstrip techniques in their feed systems.
Inventors
- 👤 Jr William P Allen
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 19:17
CPC Classifications
H; H01; H01Q; H01Q21/00; H01Q21/29; H01Q1/00; H01Q1/27; H01Q1/28; H01Q5/00; H01Q7/00; H01Q9/00; H01Q9/04; H01Q9/06; H01Q9/065
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
208 words
A combination glideslope/localizer antenna for aircraft comprising: a first and a second half-loop of electrically conductive material disposed in a common plane, said first half-loop having opposite ends connected to ground with end portions substantially perpendicular to said ground and generally symmetrical about a centerline drawn perpendicular to said ground, and said second half-loop being substantially hemicircular with opposite ends joining the edge of said first half-loop on the side thereof proximate said ground to thereby be substantially enclosed by said first half-loop; a shunt feed line operatively connected to said first half-loop, said shunt feed line including means for impedance matching of said first half-loop; a connector individual to a receiver for each glideslope and localizer antenna, the localizer receiver connector being electrically coupled to said shunt feed line; a break in the electrical continuity of each said half-loop, the break in said first half-loop being located on the remote end thereof with reference to said shunt feed line; a capacitor in the length of each said half-loop at said break; a first conductor operatively connected between the capacitor associted with the second half-loop break aforesaid and its connector; and a second conductor operatively connected between the capacitor associated with the first half-loop break aforesaid and ground.
Claim 2
Dependent Claim
208 words
A combination glideslope/localizer antenna for aircraft comprising: a first and a second half-loop of electrically conductive material disposed in a common plane, said first half-loop having opposite ends connected to ground with end portions substantially perpendicular to said ground and generally symmetrical about a centerline drawn perpendicular to said ground, and said second half-loop being substantially hemicircular with opposite ends joining the edge of said first half-loop on the side thereof proximate said ground to thereby be substantially enclosed by said first half-loop; a shunt feed line operatively connected to said first half-loop, said shunt feed line including means for impedance matching of said first half-loop; a connector individual to a receiver for each glideslope and localizer antenna, the localizer receiver connector being electrically coupled to said shunt feed line; a break in the electrical continuity of each said half-loop, the break in said first half-loop being located on the remote end thereof with reference to said shunt feed line; a capacitor in the length of each said half-loop at said break; a first conductor operatively connected between the capacitor associted with the second half-loop break aforesaid and its connector; and a second conductor operatively connected between the capacitor associated with the first half-loop break aforesaid and ground.
Claim 3
Dependent Claim
43 words
The antenna of claim 1 wherein one outside edge of said second half-loop is generally tangent to said centerline and said shunt feed line is located between the other outside edge of said second half-loop and the adjacent first half loop end portion.
Claim 4
Dependent Claim
58 words
The antenna of claim 2 including a substrate of dielectric material and wherein said first and second half-loops and said shunt feed line are disposed on one surface thereof, said conductors are each disposed on the opposite surface thereof, and each said capacitor is formed by an overlap in the length of each half-loop and each said conductor.
Claim 5
Dependent Claim
126 words
The antenna of claim 3 wherein said substrate has a thickness of about 0.03 inch, said first half-loop has a transverse dimension on the order of about 0.68 inch and a length of approximately 20.2 inches measured along its centerline and the overlap aforesaid in its length has an area of about 0.319 square inch to thereby tune said first half-loop to a frequency of about 108 to 118 megahertz, and said second half-loop has a transverse dimension on the order of about 0.30 inch and a length of approximately 6.6 inches measured along its centerline and the overlap aforesaid in its length has an area of about 0.0102 square inch to thereby tune said second half-loop to a frequency of about 327 to 335 megahertz.
Claim 6
Dependent Claim
44 words
The antenna of claim 3 wherein said means for impedance matching is a capacitor formed by a diagonal extension of conductive material disposed on said one substrate surface and a conductive strip disposed on said opposite substrate surface in overlap relation with each other.
Claim 7
Dependent Claim
36 words
The invention of claim 5 including a protective housing of dielectric material adapted To receive and enclose said antenna, and a mount carried by said housing to facilitate its connection to stationary structure of said aircraft.
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) | 1978-09-15 | 1979-03-17 | 1979-09-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-09-15 | 1983-03-17 | 1983-09-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-09-15 | 1987-03-17 | 1987-09-16 | $7700.00 | Window Closed / Lapsed |