US5113196A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Loop antenna with transmission line feed
Assignee: Motorola Solutions Inc
•
Filing: 1989-01-13
•
Granted: 1992-05-12
•
Expires: 2009-01-13
Abstract
Abstract A loop antenna includes a circuit board having a ground plane layer. A formed loop is located on one side of the circuit board and a transmission line is located on the opposite side of the circuit board. Capacitors interconnect the ends of the formed loop and the transmission line. The transmission line is a microstrip formed by the ground plane layer in a microstrip portion. The circuit board includes RF circuitry that is located on the side of the circuit board opposite to the transmission line so that the ground plane shields the circuitry from the transmission line.
Inventors
- 👤 Lorenzo A. Ponce de Leon
- 👤 Kazimierz Siwiak
- 👤 Michael P. Goldenberg
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 19:04
CPC Classifications
H; H01; H01Q; H01Q7/00; H01Q7/005; H01Q1/00; H01Q1/12; H01Q1/22; H01Q1/24; H01Q1/241; H01Q1/242; H01Q1/243
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
90 words
A loop antenna comprising: a ground plane, a loop portion located on one side of the ground plane and having opposed ends, a transmission line portion located on the opposite side of the ground plane and having opposed ends, a first capacitance means interconnecting first ends of the loop portion and the transmission line portion, a second capacitance means interconnecting second ends of the loop portion and the transmission line portion; and the transmission line portion being a microstrip formed by the said ground plane and a microstrip line portion.
Claim 2
Dependent Claim
90 words
A loop antenna comprising: a ground plane, a loop portion located on one side of the ground plane and having opposed ends, a transmission line portion located on the opposite side of the ground plane and having opposed ends, a first capacitance means interconnecting first ends of the loop portion and the transmission line portion, a second capacitance means interconnecting second ends of the loop portion and the transmission line portion; and the transmission line portion being a microstrip formed by the said ground plane and a microstrip line portion.
Claim 3
Dependent Claim
21 words
A loop antenna as defined in claim 1 in which; the microstrip line portion is formed from a flat metal strip.
Claim 4
Dependent Claim
102 words
A loop antenna comprising: a ground plane, a loop portion located on one side of the ground plane and having opposed ends, a transmission line portion located on the opposite side of the ground plane and having opposed ends, a first capacitance means interconnecting first ends of the loop portion and the transmission line portion, a second capacitance means interconnecting second ends of the loop portion and the transmission line portion; the ground plane being a layer of a circuit board, and the circuit board including radio circuitry mounted on the opposite side of the circuit board from the transmission line portion.
Claim 5
Dependent Claim
102 words
A loop antenna comprising: a ground plane, a loop portion located on one side of the ground plane and having opposed ends, a transmission line portion located on the opposite side of the ground plane and having opposed ends, a first capacitance means interconnecting first ends of the loop portion and the transmission line portion, a second capacitance means interconnecting second ends of the loop portion and the transmission line portion; the ground plane being a layer of a circuit board, and the circuit board including radio circuitry mounted on the opposite side of the circuit board from the transmission line portion.
Claim 6
Dependent Claim
27 words
A loop antenna as defined in claim 3 in which; the first and second capacitance means comprises capacitors mounted on said one side of the circuit board.
References Cited (Backward Citations)
US2578154A
Cited
US3680127A
Cited
US4506267A
Cited
US4625212A
Cited
US4862181A
Cited
US4814776A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1995-05-12 | 1995-11-11 | 1996-05-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1999-05-12 | 1999-11-11 | 2000-05-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2003-05-12 | 2003-11-11 | 2004-05-12 | $7700.00 | Window Closed / Lapsed |