US4122447A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Endfire-type phased array antenna
Assignee: Panasonic Holdings Corp
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Filing: 1976-10-26
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Granted: 1978-10-24
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Expires: 1996-10-26
Abstract
Abstract An endfire-type phased array antenna comprises n antenna elements (n≧3). The difference of current flowing through the antenna elements is controlled to one which is pre-determined by adjusting each length of the feeders and by coupling the phase inverting circuits to alternate antenna elements. The current amplitude ratio thereof is also controlled to a pre-determined value by using a mixing or distributing circuit. Thus an antenna having a high directivity in front and no radiation in other directions is provided which can be effectively used for preventing multi-path interference in TV or FM.
Inventors
- 👤 Yumio Kawai
- 👤 Michio Ikenishi
- 👤 Hiroshi Ohyama
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 18:38
CPC Classifications
H; H01; H01Q; H01Q21/00; H01Q21/06; H01Q21/22; H01Q21/08; H01Q21/12
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
183 words
An endfire-type phased array antenna comprising n dipole antenna elements wherein n is an integer greater than 2 arranged in parallel to each other on the same plane each of said n antenna elements having a feeding means connected thereto said feeding means having a pre-determined length, respectively, a mixing and distributing circuit connected to each of said feeding means for mixing the currents flowing through said feeding means with a pre-determined current amplitude ratio into said mixing circuit in the case when said antenna is used as a receiving antenna, said circuit being one for distributing the currents into said feeding means with said predetermined current amplitude ratio in the case when said antenna is used as a transmitting antenna for causing the direction of maximum response of said antenna to lie along the plane of the array, said antenna containing also phase inverting circuits, wherein alternating antenna elements from among said n antenna elements are connected directly to each of said n feeding means and the remaining alternating elements are coupled to the said mixing circuit through said phase inverting circuits.
Claim 2
Dependent Claim
183 words
An endfire-type phased array antenna comprising n dipole antenna elements wherein n is an integer greater than 2 arranged in parallel to each other on the same plane each of said n antenna elements having a feeding means connected thereto said feeding means having a pre-determined length, respectively, a mixing and distributing circuit connected to each of said feeding means for mixing the currents flowing through said feeding means with a pre-determined current amplitude ratio into said mixing circuit in the case when said antenna is used as a receiving antenna, said circuit being one for distributing the currents into said feeding means with said predetermined current amplitude ratio in the case when said antenna is used as a transmitting antenna for causing the direction of maximum response of said antenna to lie along the plane of the array, said antenna containing also phase inverting circuits, wherein alternating antenna elements from among said n antenna elements are connected directly to each of said n feeding means and the remaining alternating elements are coupled to the said mixing circuit through said phase inverting circuits.
Claim 3
Dependent Claim
25 words
An endfire-type phased array antenna according to claim 1, wherein each of said phase inverting circuits present is combined in said mixing or distributing circuit.
Claim 4
Dependent Claim
138 words
An endfire-type phased array antenna according to claim 1, wherein said n is 3, said antenna elements are disposed linearly having a distance d between adjacent antenna elements and said mixing and distributing circuit comprises means for causing the currents I 1 , I 2 and I 3 flowing through the 3 respective dipole antenna elements to satisfy a current amplitude ratio of I 1 :I 2 :I 3 =1:2:1, and said pre-determined lengths of said feeding means are chosen for causing the phases φ 1 , φ 2 and φ 3 , respectively, to satisfy the relations φ 2 = k o d±π and φ 3 = 2(k o d±π) on the basis of φ 1 (φ 1 =0), where k o =2π/λ, d is the distance between the dipole antenna elements, and λ is the wavelength.
Claim 5
Dependent Claim
137 words
An endfire-type phased array antenna according to claim 1, wherein said n is 3, said antenna elements are disposed linearly having a distance d between adjacent antenna elements and said mixing and distributing circuit comprises means for causing the currents I 1 , I 2 and I 3 flowing through the 3 respective dipole antenna elements to satisfy current amplitude ratio of I 1 :I 2 :I 3 =1:2cos(k o d/2):1, and said predetermined lengths of said feeing means are chosen for causing the phases φ 1 , φ 2 and φ 3 , respectively, to satisfy the relations φ 2 =(k o d/2)±π and φ 3 =k o d±2π on the basis of φ 1 (φ 1 =0), where k o =2π/λ, d is the distance between the dipole antenna elements, and λ is the wavelength.
Claim 6
Dependent Claim
132 words
An endfire-type phased array antenna according to claim 1, wherein said antenna elements are disposed linearly having a distance d between adjacent antenna elements and said mixing and distributing circuit comprises means for causing the current amplitude of the ith antenna element I i to satisfy the relation: ##EQU4## wherein I 1 is the current amplitude of the first antenna element and n is the number of antenna elements and said predetermined lengths of said feeding means are chosen for causing the phase of the current of the ith antenna element φ 1 to satisfy the relation: φ.sub.i = (i-1)(k.sub.o d±π)+φ.sub.1 wherein φ 1 is the phase of the current of the first antenna element, k o =2π/λ where λ is the wavelength and d is the distance between adjacent antenna elements.
Claim 7
Dependent Claim
19 words
An endfire-type phased array antenna according to claim 1, wherein said feeding means are twin lead balance type feeders.
Claim 8
Dependent Claim
24 words
An endfire-type phased array antenna according to claim 6, wherein said phase inverting circuits are formed by crossing said twin lead balance type feeder.
Claim 9
Dependent Claim
36 words
An endfire-type phased array antenna according to claim 1, wherein said feeding means comprise a balun circuit connected to each of said antenna elements and a co-axial type feeder connected to each of said balun circuits.
Claim 10
Dependent Claim
27 words
An endfire-type phased array antenna according to claim 8, wherein each of said phase inverting circuits present is connected between the antenna element and the balun circuit.
References Cited (Backward Citations)
US1964189A
Cited
US2409944A
Cited
US2578973A
Cited
US3082422A
Cited
US3750185A
Cited
US4010474A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1981-10-23 | 1982-04-24 | 1982-10-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1985-10-23 | 1986-04-24 | 1986-10-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1989-10-23 | 1990-04-24 | 1990-10-24 | $7700.00 | Window Closed / Lapsed |