Patent US5068670A successfully refreshed from Google Patents.
US5068670A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Broadband microwave slot antennas, and antenna arrays including same
Assignee: Individual
•
Filing: 1990-01-25
•
Granted: 1991-11-26
•
Expires: 2010-01-25
Abstract
Abstract A broadband microwave antenna exhibiting high radiation efficiency over a broad frequency band in which the VSWR is less than 2.5:1 over at least 15% of the frequency band, includes a ground plane at one side of a dielectric substrate and formed with at least one slot, and a feed strip at the other side of the substrate. The feed strip is of uniform width for substantially its complete length, but includes a change in width at the feed end of the slot to produce a first impedance matching network effective to bring the slot impedance to the level of the feed line over the broad frequency band, and another change in width at the load end of the slot to produce a second impedance matching network which reduces the slot reactance to match the reactive impedance of the load to the reactive part of the slot impedance over the broad frequency band.
Inventors
- 👤 Joseph Maoz
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 06:17
CPC Classifications
H; H01; H01Q; H01Q21/00; H01Q21/06; H01Q21/061; H01Q21/064; H01Q13/00; H01Q13/10; H01Q13/106
Claims Analysis
Total Claims: 18
Claim 1
Independent Claim
233 words
A broadband microwave antenna exhibiting high radiation efficiency over a broad frequency band in which the VSWR is less than 2.5:1 over at least 15% of the frequency band, comprising: a dielectric substrate having two sides; an electrically conductive layer serving as a ground plane on at least one side of the dielectric substrate; a feed line in the form of a feed strip of electrically conductive material at the other side of the dielectric substrate; said ground plane being formed with at least one radiating slot having a feed end at one side of the slot, and a load end at the opposite side of the slot, said feed end being electromagnetically coupled to said feed strip for feeding thereto the energy to be radiated or received; said feed strip being of uniform width for substantially its complete length, but including a change in width at the feed end of the slot to produce a first impedance matching network at the feed end of the slot effective to bring the slot impedance to the level of the feed line over said broad frequency band; said feed strip including another change in width at the load end of the slot to produce a second impedance matching network which reduces the slot reactance to match the reactive impedance of the load to the reactive part of the slot impedance over said broad frequency band.
Claim 2
Dependent Claim
233 words
A broadband microwave antenna exhibiting high radiation efficiency over a broad frequency band in which the VSWR is less than 2.5:1 over at least 15% of the frequency band, comprising: a dielectric substrate having two sides; an electrically conductive layer serving as a ground plane on at least one side of the dielectric substrate; a feed line in the form of a feed strip of electrically conductive material at the other side of the dielectric substrate; said ground plane being formed with at least one radiating slot having a feed end at one side of the slot, and a load end at the opposite side of the slot, said feed end being electromagnetically coupled to said feed strip for feeding thereto the energy to be radiated or received; said feed strip being of uniform width for substantially its complete length, but including a change in width at the feed end of the slot to produce a first impedance matching network at the feed end of the slot effective to bring the slot impedance to the level of the feed line over said broad frequency band; said feed strip including another change in width at the load end of the slot to produce a second impedance matching network which reduces the slot reactance to match the reactive impedance of the load to the reactive part of the slot impedance over said broad frequency band.
Claim 3
Dependent Claim
26 words
The antenna according to claim 1, wherein said change in width of the feed strip at the feed end of the slot defines a non-quarter-wavelength transformer.
Claim 4
Dependent Claim
30 words
The antenna according to claim 1, wherein said change in width of the feed strip at the load end of the slot is of a length other than a quarter-wavelength.
Claim 5
Dependent Claim
17 words
The antenna according to claim 1, wherein said second impedance matching network includes a lumped reactive load.
Claim 6
Dependent Claim
27 words
The antenna according to claim 1, wherein said second impedance matching network includes an open-circuited stub of a length equal to an odd number of quarter wavelengths.
Claim 7
Dependent Claim
27 words
The antenna according to claim 1, wherein said second impedance matching network includes a short-circuited stub of a length equal to an even number of quarter wavelengths.
Claim 8
Dependent Claim
27 words
The antenna according to claim 1, wherein said second impedance matching network includes a lumped inductor and capacitor connected between the feed line and the ground plane.
Claim 9
Dependent Claim
37 words
The antenna according to claim 1, wherein said radiating slot is inclined at an angle to the feed line, the feed line and the two impedance matching networks traversing the slot at the center of the slot.
Claim 10
Dependent Claim
35 words
The antenna according to claim 1, wherein said radiating slot is inclined at an angle to the feed line, the feed line and the two impedance matching networks traversing the slot off-center of the slot.
Claim 11
Dependent Claim
28 words
The antenna according to claim 1, wherein said ground plane is formed with an additional radiating slot fed by the feed line and the two impedance matching networks.
Claim 12
Dependent Claim
38 words
The antenna according to claim 1, wherein a second feed line is electromagnetically coupled to said radiating slot, said first impedance matching network coupling the feed end of the slot to at least one of said feed lines.
Claim 13
Dependent Claim
23 words
The antenna according to claim 1, wherein the central frequency of the broad frequency band is substantially that of the slot resonance frequency.
Claim 14
Dependent Claim
21 words
The antenna according to claim 1, wherein the feed line side of the dielectric substrate is shielded by a metallic cover.
Claim 15
Dependent Claim
26 words
The antenna according to claim 1, further including an electrically conductive layer serving as a second ground plane on the opposite side of the dielectric substrate.
Claim 16
Dependent Claim
24 words
An antenna according to claim 1, further including a plurality of microwave antennas, and power division circuitry feeding the antennas from the feed line.
Claim 17
Dependent Claim
27 words
The antenna according to claim 1, further including a plurality of microwave antennas, and further including phase control circuitry for feeding the antennas from the feed line.
Claim 18
Dependent Claim
27 words
An antenna according to claim 1, further including a plurality of microwave antennas, and further including amplitude control circuitry for feeding the antennas from the feed line.
References Cited (Backward Citations)
JPS5544241A
Cited
JPS55128903A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1994-11-25 | 1995-05-27 | 1995-11-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1998-11-25 | 1999-05-27 | 1999-11-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2002-11-25 | 2003-05-27 | 2003-11-26 | $7700.00 | Window Closed / Lapsed |