Patent US2329329A successfully refreshed from Google Patents.
US4157548A
Expired / Lapsed
US
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Offset fed twin electric microstrip dipole antennas
Assignee: United States Department of the Navy
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Filing: 1977-10-31
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Granted: 1979-06-05
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Expires: 1997-10-31
Abstract
Abstract Twin electric microstrip dipole antennas consisting of thin electrically ducting rectangular shape elements formed on both sides of a dielectric substrate. In these antennas the element on one side of the substrate is the mirror image of the element on the other side of the substrate. Each of the elements act, in effect, as a ground plane for the other. The thickness of the substrate to a large extent determines the bandwidth of the antenna and the length of the conducting elements on both sides of the substrate determines the resonant frequency.
Inventors
- 👤 Cyril M. Kaloi
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 00:43
CPC Classifications
H; H01; H01Q; H01Q9/00; H01Q9/04; H01Q9/0407
Claims Analysis
Total Claims: 22
Claim 1
Independent Claim
289 words
An offset fed twin electric microstrip antenna structure, comprising; a. a dielectric substrate; b. a twin pair of thin rectangular radiating elements disposed one each on opposite sides of said dielectric substrate which electrically separates the twin radiating elements; c. the radiating element on one side of said dielectric substrate being directly opposite to and the mirror image of the radiating element on the other side of said dielectric substrate; d. each of said twin radiating elements being operable to be excited to radiate, and each of said twin radiating elements acting as a ground plane for the other; e. the broadside fields of each of the antenna twin radiating elements being excited in identical modes of oscillation, radiating independently of each other with respective fields on opposite sides of the dielectric substrate being 180 degrees out of phase with one another; f. said radiating elements each having a feed point located along an edge of the length thereof; said feed points being directly opposite to each other; g. the length of the radiating elements determining the resonant frequency of said antenna; h. the antenna input impedance being variable to match most practical impedances as said feed points are moved along the edge of the length of said radiating elements without affecting the antenna radiation patterns; i. the antenna bandwidth being variable with the width of the radiating elements and the spacing between said twin radiating elements, the spacing between the twin radiating elements having somewhat greater effect on the bandwidth than the radiating element width; j. said radiating elements oscillating in a resonant mode along their length and a non-resonant mode along their width when the radiating elements widths are greater than one half the radiating elements length.
Claim 2
Dependent Claim
289 words
An offset fed twin electric microstrip antenna structure, comprising; a. a dielectric substrate; b. a twin pair of thin rectangular radiating elements disposed one each on opposite sides of said dielectric substrate which electrically separates the twin radiating elements; c. the radiating element on one side of said dielectric substrate being directly opposite to and the mirror image of the radiating element on the other side of said dielectric substrate; d. each of said twin radiating elements being operable to be excited to radiate, and each of said twin radiating elements acting as a ground plane for the other; e. the broadside fields of each of the antenna twin radiating elements being excited in identical modes of oscillation, radiating independently of each other with respective fields on opposite sides of the dielectric substrate being 180 degrees out of phase with one another; f. said radiating elements each having a feed point located along an edge of the length thereof; said feed points being directly opposite to each other; g. the length of the radiating elements determining the resonant frequency of said antenna; h. the antenna input impedance being variable to match most practical impedances as said feed points are moved along the edge of the length of said radiating elements without affecting the antenna radiation patterns; i. the antenna bandwidth being variable with the width of the radiating elements and the spacing between said twin radiating elements, the spacing between the twin radiating elements having somewhat greater effect on the bandwidth than the radiating element width; j. said radiating elements oscillating in a resonant mode along their length and a non-resonant mode along their width when the radiating elements widths are greater than one half the radiating elements length.
Claim 3
Dependent Claim
21 words
An antenna as in claim 1 wherein a plurality of said twin antennas are co-linear arrayed to provide a higher gain.
Claim 4
Dependent Claim
19 words
An antenna as in claim 1 wherein the length of said radiating elements are equal and approximately 1/2 wavelength.
Claim 5
Dependent Claim
29 words
An antenna as in claim 1 wherein said antenna operates to provide an omnidirectional far field pattern in the XY plane around the length of the twin radiating elements.
Claim 6
Dependent Claim
30 words
An antenna as in claim 1 wherein the efficiency of the twin antenna is dependent upon the thickness of said dielectric substrate and the width of the twin radiating elements.
Claim 7
Dependent Claim
62 words
An antenna as in claim 1 wherein said twin radiating elements are fed from a coaxial-to-microstrip adapter, said adapter being attached to one radiating element on one side of the dielectric substrate with the center pin of the adapter extending through said one radiating element and the dielectric substrate to the other radiating element on the opposite side of said dielectric substrate.
Claim 8
Dependent Claim
31 words
An antenna as in claim 1 wherein said twin radiating elements are fed with twin microstrip transmission lines disposed on opposite sides of said dielectric substrate along with said radiating elements.
Claim 9
Dependent Claim
23 words
An antenna as in claim 1 wherein the minimum width of said radiating element is determined by the thickness of the dielectric substrate.
Claim 10
Dependent Claim
77 words
An antenna as in claim 1 wherein at least one extension of a portion of the width of each of said radiating elements is provided at any of the ends thereof; said at least one extension on each of the twin radiating elements being the mirror image of the other; said at least one width extensions acting as a reactive load for the twin antenna for obtaining lower frequency operation without increasing the length of said elements.
Claim 11
Dependent Claim
251 words
A twin electric microstrip dipole antenna structure, comprising: a. a dielectric substrate; b. a twin pair of thin radiating elements disposed one each on opposite sides of said dielectric substrate which operates to electrically separate the two radiating elements; c. the radiating element on one side of said dielectric substrate being directly opposite to and the mirror image of the radiating element on the other side of said dielectric substrate; d. each of said twin radiating elements being operable to be excited to radiate in a microstrip mode, and each of said twin radiating elements acting as a ground plane for the other; e. the broadside fields of each of the antenna radiating elements being excited in identical modes of oscillation, radiating independently of each other with respective fields on opposite sides of the dielectric substrate being 180 degrees out of phase with one another; f. each of said radiating element being offset fed at a feed point located on the radiating elements; said feed points being directly opposite to each other; g. the length of said twin radiating elements determining the resonant frequency of the antenna; h. the input impedance of said antenna being variable to match most practical impedances as said feed points are moved on the radiating elements; i. the antenna bandwidth being variable with the width of the radiating elements and the spacing between said twin radiating elements, the spacing between the twin radiating elements having somewhat greater effect on the bandwidth than the radiating element width.
Claim 12
Dependent Claim
251 words
A twin electric microstrip dipole antenna structure, comprising: a. a dielectric substrate; b. a twin pair of thin radiating elements disposed one each on opposite sides of said dielectric substrate which operates to electrically separate the two radiating elements; c. the radiating element on one side of said dielectric substrate being directly opposite to and the mirror image of the radiating element on the other side of said dielectric substrate; d. each of said twin radiating elements being operable to be excited to radiate in a microstrip mode, and each of said twin radiating elements acting as a ground plane for the other; e. the broadside fields of each of the antenna radiating elements being excited in identical modes of oscillation, radiating independently of each other with respective fields on opposite sides of the dielectric substrate being 180 degrees out of phase with one another; f. each of said radiating element being offset fed at a feed point located on the radiating elements; said feed points being directly opposite to each other; g. the length of said twin radiating elements determining the resonant frequency of the antenna; h. the input impedance of said antenna being variable to match most practical impedances as said feed points are moved on the radiating elements; i. the antenna bandwidth being variable with the width of the radiating elements and the spacing between said twin radiating elements, the spacing between the twin radiating elements having somewhat greater effect on the bandwidth than the radiating element width.
Claim 13
Dependent Claim
21 words
An antenna as in claim 10 wherein a plurality of said twin antennas are co-linear arrayed to provide a higher gain.
Claim 14
Dependent Claim
19 words
An antenna as in claim 10 wherein the length of said radiating elements are equal and approximately 1/2 wavelength.
Claim 15
Dependent Claim
62 words
An antenna as in claim 10 wherein said twin radiating elements are fed from a coaxial-to-microstrip adapter, said adapter being attached to one radiating element on one side of the dielectric substrate with the center pin of the adapter extending through said one radiating element and the dielectric substrate to the other radiating element on the opposite side of said dielectric substrate.
Claim 16
Dependent Claim
31 words
An antenna as in claim 10 wherein said twin radiating elements are fed with twin microstrip transmission lines disposed on opposite sides of said dielectric substrate along with said radiating elements.
Claim 17
Dependent Claim
78 words
An antenna as in claim 10 wherein at least one extension of a portion of the width of each of said radiating elements is provided at any of the ends thereof; said at least one extension on each of the twin radiating elements being the mirror image of the other; said at least one width extensions acting as a reactive load for the twin antenna for obtaining lower frequency operation without increasing the length of said radiating elements.
Claim 18
Dependent Claim
98 words
An antenna as in claim 10 wherein each of said radiating elements have a center conducting portion thereof removed and respective secondary radiating elements, smaller than the removed portions are disposed on each side of said dielectric substrate within the area of said removed portions and spaced from said radiating elements; said radiating elements and secondary radiating elements being disposed directly opposite to each other on opposite sides of said dielectric substrate; said smaller secondary radiating elements being operable to be excited and also radiate when separately fed with a separate feed line to a feed point thereon.
Claim 19
Dependent Claim
51 words
An antenna as in claim 10 wherein a reflector is used behind one side thereof for reflecting the radiation from one of the twin radiating elements in the same direction as radiation from the other of the twin radiating elements thereby increasing the radiation signal from the antenna in one direction.
Claim 20
Dependent Claim
95 words
An antenna as in claim 10 wherein each of said radiating elements has a center conducting portion thereof removed and respective secondary radiating elements, smaller than the removed portions are disposed on each side of said dielectric substrate within the area of said removed portions and spaced from said radiating elements; said radiating elements and secondary radiating elements being disposed directly opposite to each other on opposite sides of said dielectric substrate; said smaller secondary radiating elements being operable to be excited and also radiate when coupled fed from the respective larger said radiating elements.
Claim 21
Dependent Claim
95 words
An antenna as in claim 10 wherein each of said radiating elements have a center conducting portion thereof removed and respective secondary radiating elements, smaller than the removed portions are disposed on each side of said dielectric substrate within the area of said removed portions and spaced from said radiating elements; said radiating elements and secondary radiating elements being disposed directly opposite to each other on opposite sides of said dielectric substrate; said smaller secondary radiating elements being operable to be excited and also radiate when secondarily fed from the respective larger said radiating element.
Claim 22
Dependent Claim
98 words
An antenna as in claim 10 wherein each of said radiating elements have a center conducting portion thereof removed and respective secondary radiating elements, smaller than the removed portions are disposed on each side of said dielectric substrate within the area of said removed portions and spaced from said radiating elements; said radiating elements and secondary radiating elements being disposed directly opposite to each other on opposite sides of said dielectric substrate; said smaller secondary elements being operable to be excited and also radiate when fed from a T-feed line along with the respective larger said radiating elements.
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) | 1982-06-04 | 1982-12-04 | 1983-06-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1986-06-04 | 1986-12-04 | 1987-06-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1990-06-04 | 1990-12-04 | 1991-06-05 | $7700.00 | Window Closed / Lapsed |