US4890116A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Low profile, broad band monopole antenna
Assignee: SHAKESSPEARE COMPANY A CORP OF DELAWARE
•
Filing: 1986-04-09
•
Granted: 1989-12-26
•
Expires: 2006-04-09
Abstract
Abstract A low-profile, broad band monople antenna (10) includes two linear radiators (11,13), a resistor network (18), and a transmission line network (20), all connected in series in that order. Linear radiator (11) includes a capacitor (12) which reduces the apparent electrical length of the antenna and provides high voltage isolation. Resistor network (18) reduces VSWR at lower frequencies in the band of interest such that in combination with the other elements, the VSWR for antenna (10) is sufficiently low that no further matching or tuning is necessary over the entire broad frequency band of interest without significant loss of gain relative to that of a monopole antenna one-quarter wave resonant at each frequency throughout the frequency band of interest.
Inventors
- 👤 John R. Lewis, Jr.
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 06:25
CPC Classifications
H; H01; H01Q; H01Q9/00; H01Q9/04; H01Q9/30; H01Q9/32
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
167 words
A low-profile, monopole antenna operable over a predetermined broad band and connected to a transmission line, comprising a radiator including means for providing a series capacitance, and radiator including first linear radiator and second linear radiator operatively connected to one end of said first linear radiator. network means for substantially coupling and matching the impedance of the antenna with the impedance of the transmission line to which it is connected, said network means operatively connected to said radiator; and, resistance means for minimizing the antenna's voltage standing wave ration (VSWR) over lower frequencies in said broad band to make tuning unnecessary and gain approximate that of a one-quarter wavelength monopole over substantially all frequencies in said broad band, said resistance means electrically connected in series between said network means and the end of said linear radiator opposite that connected to said first linear radiator, and the resistance of said resistance means reducing VSWR at the lower frequencies in the range of approximately 30 MHz to 90 Mhz.
Claim 2
Dependent Claim
167 words
A low-profile, monopole antenna operable over a predetermined broad band and connected to a transmission line, comprising a radiator including means for providing a series capacitance, and radiator including first linear radiator and second linear radiator operatively connected to one end of said first linear radiator. network means for substantially coupling and matching the impedance of the antenna with the impedance of the transmission line to which it is connected, said network means operatively connected to said radiator; and, resistance means for minimizing the antenna's voltage standing wave ration (VSWR) over lower frequencies in said broad band to make tuning unnecessary and gain approximate that of a one-quarter wavelength monopole over substantially all frequencies in said broad band, said resistance means electrically connected in series between said network means and the end of said linear radiator opposite that connected to said first linear radiator, and the resistance of said resistance means reducing VSWR at the lower frequencies in the range of approximately 30 MHz to 90 Mhz.
Claim 3
Dependent Claim
205 words
A low-profile, monopole antenna operable over a predetermined broad band and connected to a transmission line, comprising: a radiator including means for providing a series capacitance, said radiator including first linear radiator and second linear radiator operatively connected to one end of said first linear radiator, said means for providing a series capacitance including conductive member means electrically connected to a first portion of said first linear radiator for extension into a second portion of said first linear radiator, and dielectric spacer means secured within said second portion of said first linear radiator within which said conductive member means is extended to provide said series capacitance; network means for substantially coupling and matching the impedance of the antenna with the impedance of the transmission line to which it is connected, said network means operatively connected to said radiator; and, resistance means for minimizing the antenna,s voltage standing wave ratio (VSWR) over lower frequencies in said broad band to make tuning unnecessary and gain approximate that of a one-quarter wavelength monopole over substantially all frequencies in said broad band, said resistance means electrically connected in series between said network means and the end of said second linear radiator opposite that connected to said first linear radiator.
Claim 4
Dependent Claim
205 words
A low-profile, monopole antenna operable over a predetermined broad band and connected to a transmission line, comprising: a radiator including means for providing a series capacitance, said radiator including first linear radiator and second linear radiator operatively connected to one end of said first linear radiator, said means for providing a series capacitance including conductive member means electrically connected to a first portion of said first linear radiator for extension into a second portion of said first linear radiator, and dielectric spacer means secured within said second portion of said first linear radiator within which said conductive member means is extended to provide said series capacitance; network means for substantially coupling and matching the impedance of the antenna with the impedance of the transmission line to which it is connected, said network means operatively connected to said radiator; and, resistance means for minimizing the antenna,s voltage standing wave ratio (VSWR) over lower frequencies in said broad band to make tuning unnecessary and gain approximate that of a one-quarter wavelength monopole over substantially all frequencies in said broad band, said resistance means electrically connected in series between said network means and the end of said second linear radiator opposite that connected to said first linear radiator.
Claim 5
Dependent Claim
183 words
A low-profile, monopole antenna operable over a predetermined broad band and connected to a transmission line, comprising a radiator including means for providing a series capacitance, said radiator including first linear radiator and second linear radiator operatively connected to one end of said first linear radiator; network means for substantially coupling and matching the impedance of the antenna with the impedance of the transmission line to which it is connected, said network means operatively connected to said radiator, said network means including broad band transformer means for coupling the antenna to the transmission line and means for matching the impedance of the antenna with the impedance of the transmission line over said broad band of interest; and, resistance means for minimizing the antenna,s voltage standing wave ratio (VSWR) over lower frequencies in said broad band to make tuning unnecessary and gain approximate that of a one-quarter wavelength monopole over substantially all frequencies in said broad band, said resistance means electrically connected in series between said network means and the end of said second linear radiator opposite that connected to said first linear radiator.
Claim 6
Dependent Claim
183 words
A low-profile, monopole antenna operable over a predetermined broad band and connected to a transmission line, comprising a radiator including means for providing a series capacitance, said radiator including first linear radiator and second linear radiator operatively connected to one end of said first linear radiator; network means for substantially coupling and matching the impedance of the antenna with the impedance of the transmission line to which it is connected, said network means operatively connected to said radiator, said network means including broad band transformer means for coupling the antenna to the transmission line and means for matching the impedance of the antenna with the impedance of the transmission line over said broad band of interest; and, resistance means for minimizing the antenna,s voltage standing wave ratio (VSWR) over lower frequencies in said broad band to make tuning unnecessary and gain approximate that of a one-quarter wavelength monopole over substantially all frequencies in said broad band, said resistance means electrically connected in series between said network means and the end of said second linear radiator opposite that connected to said first linear radiator.
Claim 7
Dependent Claim
22 words
A low-profile, monopole antenna, as set forth in claim 3, wherein said broad band transformer means includes a toroidal impedance matching transformer.
Claim 8
Dependent Claim
35 words
A low-profile, monopole antenna, as set forth in claim 3, wherein said means for matching the impedance of the antenna with the impedance of the transmission line includes a transmission line and a matching capacitor.
References Cited (Backward Citations)
GB281762A
Cited
US3950757A
Cited
US4028704A
Cited
US4086596A
Cited
DD129835A1
Cited
US4238800A
Cited
US4238799A
Cited
US4328501A
Cited
US4466003A
Cited
GB2148604A
Cited
US4513338A
Cited
GB2171258A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1992-12-25 | 1993-06-26 | 1993-12-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1996-12-25 | 1997-06-26 | 1997-12-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2000-12-25 | 2001-06-26 | 2001-12-26 | $7700.00 | Window Closed / Lapsed |