US3623162A - Folded slot antenna - Google Patents

Folded slot antenna Download PDF

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Publication number
US3623162A
US3623162A US58015A US3623162DA US3623162A US 3623162 A US3623162 A US 3623162A US 58015 A US58015 A US 58015A US 3623162D A US3623162D A US 3623162DA US 3623162 A US3623162 A US 3623162A
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Prior art keywords
sheet
slot
antenna
folded
bend
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Expired - Lifetime
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US58015A
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Arthur R Whitty
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Lockheed Corp
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Sanders Associates Inc
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    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01Q—ANTENNAS, i.e. RADIO AERIALS
    • H01Q1/00—Details of, or arrangements associated with, antennas
    • H01Q1/27—Adaptation for use in or on movable bodies
    • H01Q1/28—Adaptation for use in or on aircraft, missiles, satellites, or balloons
    • H01Q1/286—Adaptation for use in or on aircraft, missiles, satellites, or balloons substantially flush mounted with the skin of the craft
    • H01Q1/287—Adaptation for use in or on aircraft, missiles, satellites, or balloons substantially flush mounted with the skin of the craft integrated in a wing or a stabiliser
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01Q—ANTENNAS, i.e. RADIO AERIALS
    • H01Q13/00—Waveguide horns or mouths; Slot antennas; Leaky-waveguide antennas; Equivalent structures causing radiation along the transmission path of a guided wave
    • H01Q13/10—Resonant slot antennas
    • H01Q13/16—Folded slot antennas

Definitions

  • FIG. 5 ARTHUR R. WHITTY BYRM W A r TOR/V5 Y PAIENTEDunv 23 ml 8, 6 23. l 6 2 SHEET 3 OF 3 POWER COMBINER 24 FIG. 5
  • the antenna aperture or slot dimension must be on the order of )t/2(where his wavelength) at the center frequency of the band of interest.
  • the slot length for a slotted antenna must be on the order of 50inches.
  • the efiective aircraft surface area occupied by the slot length can be reduced by various techniques such as ferrite loading, folded slots, dumbbell slots and the like.
  • techniques such as the foregoing tend to decrease the radiation efficiency such that the antenna gain is reduced by essentially the same factor as the bandwidth is increased. That is, the overall gain is the product of the directive gain product the radiation efficiency.
  • An object of this invention is to provide a new and improved folded slot antenna.
  • Another object of this invention is to provide a novel and improved antenna which can be flush mounted on a moving vehicle such as an aircraft.
  • Yet another object is to provide an electrically small antenna structure.
  • Still another object is to provide an improved wide band antenna which is electrically small in physical structure but yet achieves the efficiency of a slotted antenna having a slot length of lt/2at the center frequency of the band of interest.
  • Antenna apparatus embodying the present invention comprises a sheet of conductive material folded upon itself and having a bow tie shaped slot arranged symmetrically about the bend of the fold in the surface of the sheet.
  • FIG. 1 is a plan view of an unfolded bow tie antenna structure viewed from the electrically conductive ground plane side of the structure;
  • FIG. 2 is a cross section of a portion of the antenna structure taken along the lines 2-2 of FIG. 1, which section illustrates the sandwich-type nature of the antenna structure;
  • FIG. 3 is a phantom or outline view of the ground plane folded back upon itself with the bow tie shaped slot arranged symmetrically about the bend of the fold;
  • FIG. 4 is a side view of a portion of an aircraft illustrating the fiush mounting of an antenna embodying the invention in the aircraft dorsal fin for an aviation communication band application;
  • FIG. 5 is a block diagram in part and a perspective view in part illustrating the flush mounting of antenna structures embodying the invention in the horizontal stabilizer of an aircraft for an aviation navigation band application.
  • FIGS. 1-3 there is shown an antenna aparranged symmetrically about the bend 12 of the folded ground plane so as to apportion the ground plane 10 into an outer portion and an inner portion 10b.
  • the slot It has a total length of A/2at the high end of the band of interest.
  • the slot 11 occupies a rather small area of the surface of ground plane 10.
  • Energy feed means, such as coaxial cable 13 is coupled across slot 11 at the narrow extreme of the bow tie near or at the bend area 12.
  • FIG. 1 the ground plane 10 is shown in a plan view of an unfolded position so as to more clearly show the slot 1] and its electric field directions.
  • the bend 12 of FIG. 3 is formed by folding the top and the bottom of the ground plane 10 out of the plane of FIG. 1 drawing toward the viewer about the dash line UP.
  • the antenna structure is excited by a signal from a transmitter/receiver device, not shown, via cable 13, the resulting electric field has a direction which is always across the slot it between its inner and outer edges.
  • the ground plane 10 is not folded as in FIG. 1 the electric fields in the elongated slot portions R-S and XW tend to cancel one another.
  • the fields in the elongated slot portions -RS and XW are additive such that there is a resultant E vector having a direction along those planes which are parallel to the orientation of the bend 12 (FIG. 3).
  • the elongated slot portions R-8 and XW are preferably chosen as long as possible (within the A/Zdesign length) such that the electric field induced across these elongated slot portions overcomes the cancelling field due to the slanted slot portions P-Q, T-U, U-V, PY.
  • the electric field at 14 of slot portion TU has the first component El which is perpendicular to the field of portion R-S and a second component E2 which is parallel to and in opposition to the electric field across the portion R-S. Since the magnitude of the E2 component is less than the magnitude of the E field in the elongated R-S slot portion, there will be a resultant electric field.
  • the field in the S'I' portion of the slot 11 has a field component parallel to and in the same direction as the field of slot portion R-S, as illustrated at point 15.
  • These field components in the S-T portion are also additive to the resulting direction of the E vector so as to tend to overcome the cancelling effects of the field induced in the TU portion.
  • An analysis similar to the foregoing can also be made for the PQR, PYX and the UVW slot portion for those field components which are parallel to the direction of the E vector with the'end result that there will be a resultant E vector having a direction along those planes which are parallel to the orientation of the bend 12 of FIG. 3.
  • the polarization of the antenna (E-vector direction) is therefore dependent upon the orientation of the bend 12 of the folded ground plane 10. Further, electric fields due to signals from a polarization opposite to a chosen one will be substantially cancelled.
  • the antenna structure may be mounted on an aircraft dorsal fin so as to have a vertical polarization for operation in the communication band as illustrated in FIG. 4.
  • the antenna structure could be mounted upon the aircraft horizontal stabilizer as shown in FIG. 5 so as to have a horizontal polarization for operation in the navigation band. In either case, the intended result is that electric fields due to signals of the opposite polarization are substantially cancelled.
  • FIG. 2 is a partial cross section of the antenna apparatus as shown in FIG. 1 along the lines 2-2 illustrating an exemplary structurally sound or rigid structure for supporting the ground plane 10.
  • the ground plane may be suitably composed of a metallic sheet of material as for example a sheet of aluminum.
  • the metallic sheet 10 is mounted upon a rigid structure which is shown to comprise sheet substances 16 and 17.
  • the sheet substance 16 could be a sheet of flexible plastic.
  • the metallic sheet 10 is first laminated to the flexible plastic sheet 16.
  • the slot 11 would then be etched according to well-known processes.
  • the laminated plastic sheet and metallic ground plane 10 would then be bonded at its free surface to a sheet of rigid material 17.
  • the rigid material 17 may be any suitable electromagnetically transparent material such as fiber glass.
  • the sheet 17 Prior to the bonding operation, the sheet 17 is preferably formed into a folded structure the degree of bend of which is chosen to fit the contour of that portion of the aircraft or other vehicle where it is to be flush mounted. The bonding operation it then performed, after which the antenna structure is ready for flush mounting.
  • the antenna apparatus may be flush mounted for vertical polarization (communication band operation) in the dorsal fin 18 of an aircraft of which only a portion is shown.
  • the antenna apparatus is designated by the reference character 19 and has the same bow tie slot as described above.
  • the dorsal fin 18 is shown to have two portions 18a and 18b.
  • the portion 18a is mounted forward of the antenna 19 while the portion 18b is mounted aft of the antenna 19.
  • the metallic ground plane and the antenna structure 19 make contact with the metallic skin of the aircraft fuselage.
  • antenna apparatus embodying the invention is illustrated as adapted for flush mounting in an aircraft horizontal stabilizer for a navigation band application.
  • a pair of substantially identical antenna elements 20a and 20b each embodying the invention, are adapted for flush mounting in a pair of precut receptacles 21a and 21b, respectively, in a horizontal stabilizer 22.
  • the energy feed cables 23a and 23b of the antenna elements 200 and 20b, respectively, are coupled to a power combiner 24 which combines the received energy.
  • the power combiner is coupled to a receive device 25.
  • the precut receptacles 21a and 21b are located on difi'erent sides of the tail structure and therefore the fuselage (neither of which is shown in FIG. 5) of the aircraft.
  • the reason for two elements is that is has been found that one element does not operate efficiently throughout the navigation band due to the shading effects of the fuselage.
  • the ground plane of each of the antenna elements 200 and 20b makes contact with the metallic skin of the aircraft horizontal stabilizer.
  • the rib structure within the stabilizer unit 22 tends to provide cavity backing for the folded slot antenna elements 20a and 20b.
  • a novel and improved antenna apparatus in which a sheet of conductive material is folded upon itself and has an endless bow tie shaped slot about the bend of the fold.
  • the polarization of the antenna element is along those planes which are parallel to the orientation of the bend of the folded conductive sheet.
  • the slot length is )t/2but can be loaded is desired with an attendant loss in antenna efficiency.
  • the slot length may be made longer than M2.
  • the width of the slot is preferably uniform so as to maintain symmetry.
  • An antenna comprising a sheet of conductive material folded upon itself and having a bow tie shaped endless slot arranged symmetrically about the bend of the fold on the surface of the sheet.

Abstract

A folded slot antenna comprising a sheet of conductive material folded upon itself and having a bow tie shaped slot arranged symmetrically about the bend of the fold on the surface of the sheet. This antenna structure can be flush mounted, for example, in the leading edge of the horizontal stabilizer or of the dorsal fin of an aircraft.

Description

United States Patent Al'lhlll' R. Whitty Hollis, N.ll.
July 24, 1970 Nov. 23, 1971 Sanders Associates, Inc. Nashua, N.ll.
[72] Inventor [2l Appl. No. [22] Filed [45] Patented [73] Assignee [54] FOLDED SLOT ANTENNA 4 Claims, 5 Drawing Figs.
[52] US. Cl 343/767, 343/708 [51] Int. Cl. ll0lq 1/28, HOlq 13/10, l-lOlq 13/16 [50] Field of Search 343/705,
[56] Reierences Cited UNITED STATES PATENTS 3,475,555 10/1969 Bassen et al. 343/908 x FOREIGN PATENTS 803,723 10/1958 Great Britain 343/708 Primary Examiner-Herman Karl Saalbach Assistant Examiner-Marvin Nussbaum Altomey-Louis Etlinger ABSTRACT: A folded slot antenna comprising a sheet of conductive material folded upon itself and having a bow tie shaped slot arranged symmetrically about the bend of the fold on the surface of the sheet. This antenna structure can be flush mounted, for example, in the leading edge of the horizontal stabilizer or of the dorsal fin of an aircraft.
PATENTEnuuv 23 i9?! 3,623,162
SHEET 1 [1F 3 FIG! FIG. 2
INVENTOR. ARTHUR R. WHITTY ATTORNEY PATENTEnunv 23 I97] 3, 23,162
sum 2 0F 3 E VECTOR GROUND l; PLANE (Ob l2 wwwww i |o q 10b 7 u m &\\ 7 V BOWTIE SLOT F I G 3 INVENTOR.
ARTHUR R. WHITTY BYRM W A r TOR/V5 Y PAIENTEDunv 23 ml 8, 6 23. l 6 2 SHEET 3 OF 3 POWER COMBINER 24 FIG. 5
RECEIVER 25 INVENTOR. ARTHUR R. WHITTY (Mam A T TORNE Y roman SLOT ANTENNA BACKGROUND OF THE INVENTION desirable since externally mounted antennas increase drag and Y are subject to icing conditions, which in some cases cause the aircraft rudder to lock.
2. Description of Prior Art One of the problems encountered in the design of flushmounted antennas for the aviation, navigation or communication band is the large physical size required to achieve wide band performance. In particular, the antenna aperture or slot dimension must be on the order of )t/2(where his wavelength) at the center frequency of the band of interest. For example, in the navigation band; the slot length for a slotted antenna must be on the order of 50inches. It is known that the efiective aircraft surface area occupied by the slot length can be reduced by various techniques such as ferrite loading, folded slots, dumbbell slots and the like. However, techniques such as the foregoing tend to decrease the radiation efficiency such that the antenna gain is reduced by essentially the same factor as the bandwidth is increased. That is, the overall gain is the product of the directive gain product the radiation efficiency.
BRIEF SUMMARY OF THE INVENTION An object of this invention is to provide a new and improved folded slot antenna.
Another object of this invention is to provide a novel and improved antenna which can be flush mounted on a moving vehicle such as an aircraft.
Yet another object is to provide an electrically small antenna structure.
Still another object is to provide an improved wide band antenna which is electrically small in physical structure but yet achieves the efficiency of a slotted antenna having a slot length of lt/2at the center frequency of the band of interest.
Antenna apparatus embodying the present invention comprises a sheet of conductive material folded upon itself and having a bow tie shaped slot arranged symmetrically about the bend of the fold in the surface of the sheet.
BRIEF DESCRIPTION OF THE DRAWINGS In the accompanying drawings, like reference characters denote like structural elements, and:
FIG. 1 is a plan view of an unfolded bow tie antenna structure viewed from the electrically conductive ground plane side of the structure; I
FIG. 2 is a cross section of a portion of the antenna structure taken along the lines 2-2 of FIG. 1, which section illustrates the sandwich-type nature of the antenna structure;
FIG. 3 is a phantom or outline view of the ground plane folded back upon itself with the bow tie shaped slot arranged symmetrically about the bend of the fold;
FIG. 4 is a side view of a portion of an aircraft illustrating the fiush mounting of an antenna embodying the invention in the aircraft dorsal fin for an aviation communication band application;
FIG. 5 is a block diagram in part and a perspective view in part illustrating the flush mounting of antenna structures embodying the invention in the horizontal stabilizer of an aircraft for an aviation navigation band application.
DESCRIPTION OF PREFERRED EMBODIMENT Referring now to FIGS. 1-3 there is shown an antenna aparranged symmetrically about the bend 12 of the folded ground plane so as to apportion the ground plane 10 into an outer portion and an inner portion 10b. For wide band performance the slot It has a total length of A/2at the high end of the band of interest. However, due to the bow tie shape, the slot 11 occupies a rather small area of the surface of ground plane 10. Energy feed means, such as coaxial cable 13 is coupled across slot 11 at the narrow extreme of the bow tie near or at the bend area 12.
In FIG. 1 the ground plane 10 is shown in a plan view of an unfolded position so as to more clearly show the slot 1] and its electric field directions. For reference purposes the bend 12 of FIG. 3 is formed by folding the top and the bottom of the ground plane 10 out of the plane of FIG. 1 drawing toward the viewer about the dash line UP. When the antenna structure is excited by a signal from a transmitter/receiver device, not shown, via cable 13, the resulting electric field has a direction which is always across the slot it between its inner and outer edges. When the ground plane 10 is not folded as in FIG. 1 the electric fields in the elongated slot portions R-S and XW tend to cancel one another. However, when the slot is folded as in FIG. 3, the fields in the elongated slot portions -RS and XW are additive such that there is a resultant E vector having a direction along those planes which are parallel to the orientation of the bend 12 (FIG. 3).
The elongated slot portions R-8 and XW are preferably chosen as long as possible (within the A/Zdesign length) such that the electric field induced across these elongated slot portions overcomes the cancelling field due to the slanted slot portions P-Q, T-U, U-V, PY. For example, the electric field at 14 of slot portion TU has the first component El which is perpendicular to the field of portion R-S and a second component E2 which is parallel to and in opposition to the electric field across the portion R-S. Since the magnitude of the E2 component is less than the magnitude of the E field in the elongated R-S slot portion, there will be a resultant electric field. In addition, the field in the S'I' portion of the slot 11 has a field component parallel to and in the same direction as the field of slot portion R-S, as illustrated at point 15. These field components in the S-T portion are also additive to the resulting direction of the E vector so as to tend to overcome the cancelling effects of the field induced in the TU portion. An analysis similar to the foregoing can also be made for the PQR, PYX and the UVW slot portion for those field components which are parallel to the direction of the E vector with the'end result that there will be a resultant E vector having a direction along those planes which are parallel to the orientation of the bend 12 of FIG. 3.
Those field components in slot portions PQR and STU which are perpendicular to the field contributed by elongated slot portion R-S oppose one another. Assuming a uniform electric field across the slot 11, the last-mentioned field components tend to cancel one another due to the geometrical symmetry of the bow tie shaped slot 11. A similar analysis could be pursued to demonstrate that those field components in the slot portions PYX and UVW which are perpendicular to the field contributed by the XW elongated slot portion tend to cancel one another.
Thus, the polarization of the antenna (E-vector direction) is therefore dependent upon the orientation of the bend 12 of the folded ground plane 10. Further, electric fields due to signals from a polarization opposite to a chosen one will be substantially cancelled. For example, the antenna structure may be mounted on an aircraft dorsal fin so as to have a vertical polarization for operation in the communication band as illustrated in FIG. 4. 0n the other hand, the antenna structure could be mounted upon the aircraft horizontal stabilizer as shown in FIG. 5 so as to have a horizontal polarization for operation in the navigation band. In either case, the intended result is that electric fields due to signals of the opposite polarization are substantially cancelled.
Reference is now made to FIG. 2 which is a partial cross section of the antenna apparatus as shown in FIG. 1 along the lines 2-2 illustrating an exemplary structurally sound or rigid structure for supporting the ground plane 10. As shown in FIG. 2, the ground plane may be suitably composed of a metallic sheet of material as for example a sheet of aluminum. The metallic sheet 10 is mounted upon a rigid structure which is shown to comprise sheet substances 16 and 17. According to one mode of manufacture, the sheet substance 16 could be a sheet of flexible plastic. The metallic sheet 10 is first laminated to the flexible plastic sheet 16. The slot 11 would then be etched according to well-known processes. The laminated plastic sheet and metallic ground plane 10 would then be bonded at its free surface to a sheet of rigid material 17. The rigid material 17 may be any suitable electromagnetically transparent material such as fiber glass. Prior to the bonding operation, the sheet 17 is preferably formed into a folded structure the degree of bend of which is chosen to fit the contour of that portion of the aircraft or other vehicle where it is to be flush mounted. The bonding operation it then performed, after which the antenna structure is ready for flush mounting.
With reference to FIG. 4 the antenna apparatus may be flush mounted for vertical polarization (communication band operation) in the dorsal fin 18 of an aircraft of which only a portion is shown. In FIG. 4 the antenna apparatus is designated by the reference character 19 and has the same bow tie slot as described above. The dorsal fin 18 is shown to have two portions 18a and 18b. The portion 18a is mounted forward of the antenna 19 while the portion 18b is mounted aft of the antenna 19. The metallic ground plane and the antenna structure 19 make contact with the metallic skin of the aircraft fuselage.
Referring next to FIG. 5, antenna apparatus embodying the invention is illustrated as adapted for flush mounting in an aircraft horizontal stabilizer for a navigation band application. In this application a pair of substantially identical antenna elements 20a and 20b, each embodying the invention, are adapted for flush mounting in a pair of precut receptacles 21a and 21b, respectively, in a horizontal stabilizer 22. The energy feed cables 23a and 23b of the antenna elements 200 and 20b, respectively, are coupled to a power combiner 24 which combines the received energy. The power combiner, of course, is coupled to a receive device 25.
The precut receptacles 21a and 21b are located on difi'erent sides of the tail structure and therefore the fuselage (neither of which is shown in FIG. 5) of the aircraft. The reason for two elements is that is has been found that one element does not operate efficiently throughout the navigation band due to the shading effects of the fuselage. The ground plane of each of the antenna elements 200 and 20b makes contact with the metallic skin of the aircraft horizontal stabilizer. The rib structure within the stabilizer unit 22 tends to provide cavity backing for the folded slot antenna elements 20a and 20b.
There has been described a novel and improved antenna apparatus in which a sheet of conductive material is folded upon itself and has an endless bow tie shaped slot about the bend of the fold. The polarization of the antenna element is along those planes which are parallel to the orientation of the bend of the folded conductive sheet. Preferably the slot length is )t/2but can be loaded is desired with an attendant loss in antenna efficiency. For even wider band performance, the slot length may be made longer than M2. The width of the slot is preferably uniform so as to maintain symmetry.
What is claimed is:
1. An antenna comprising a sheet of conductive material folded upon itself and having a bow tie shaped endless slot arranged symmetrically about the bend of the fold on the surface of the sheet.
2. The invention according to claim 1 wherein said slot has a uniform width.
3. The invention according to claim 2 wherein said conductive sheet is a sheet of metallic material.
4. The invention according to claim 3 wherein said sheet of metallic material is affigced to a sheet of rigid electromagnetically transparent material which has the same folded contour as the metallic sheet.
l t it

Claims (4)

1. An antenna comprising a sheet of conductive material folded upon itself and having a bow tie shaped endless slot arranged symmetrically about the bend of the fold on the surface of the sheet.
2. The invention according to claim 1 wherein said slot has a uniform width.
3. The invention according to claim 2 wherein said conductive sheet is a sheet of metallic material.
4. The invention according to claim 3 wherein said sheet of metallic material is affixed to a sheet of rigid electromagnetically transparent material which has the same folded contour as the metallic sheet.
US58015A 1970-07-24 1970-07-24 Folded slot antenna Expired - Lifetime US3623162A (en)

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Cited By (17)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4373162A (en) * 1980-03-10 1983-02-08 Control Data Corporation Low frequency electronically steerable cylindrical slot array radar antenna
US5191351A (en) * 1989-12-29 1993-03-02 Texas Instruments Incorporated Folded broadband antenna with a symmetrical pattern
US5353038A (en) * 1991-04-08 1994-10-04 Bell Helicopter Textron Inc. Automatic direction finder sense antenna
US6002371A (en) * 1996-11-14 1999-12-14 Brother International Corporation Die-cut antenna for cordless telephone radio transceiver
US6054963A (en) * 1996-02-27 2000-04-25 Thomson Licensing S.A. Folded bow-tie antenna
US6400329B1 (en) 1997-09-09 2002-06-04 Time Domain Corporation Ultra-wideband magnetic antenna
US6703983B2 (en) * 2001-08-29 2004-03-09 Hon Hai Precision Ind. Co., Ltd. Slot antenna having irregular geometric shape
US6762730B2 (en) * 2002-10-04 2004-07-13 Spx Corporation Crossed bow tie slot antenna
US20050045991A1 (en) * 2002-10-02 2005-03-03 Arup Bhattacharyya Computer systems containing resistors which include doped silicon/germanium
US20050083238A1 (en) * 2003-10-18 2005-04-21 Kennedy Colm C. Slot antenna
EP1594187A1 (en) * 2004-05-05 2005-11-09 TDK Corporation Folded laminar antenna
US20060033672A1 (en) * 2004-08-10 2006-02-16 Spx Corporation Folded broadcast panel antenna system and method
US20080169987A1 (en) * 2006-10-11 2008-07-17 Mcnutt Duane K Shunt antenna for aircraft
DE10141583B4 (en) * 2001-08-24 2014-02-13 Heinz Lindenmeier Antenna arrangement in the aperture of an electrically conductive vehicle body
CN109390681A (en) * 2017-08-08 2019-02-26 波音公司 Structure stacked antenna designs and manufactures
CN110190379A (en) * 2019-05-05 2019-08-30 中国商用飞机有限责任公司 A kind of Airborne High-frequency antenna
WO2020260311A1 (en) * 2019-06-28 2020-12-30 Airbus Operations Gmbh Antenna assembly, vertical tail, horizontal tail, wing, aircraft, and method

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB803723A (en) * 1956-11-09 1958-10-29 Standard Telephones Cables Ltd Improvements in or relating to aircraft antenna
US3475555A (en) * 1966-04-22 1969-10-28 Columbia Broadcasting Syst Inc Dual resolution scanning system using carrier transmission of plural video signals

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB803723A (en) * 1956-11-09 1958-10-29 Standard Telephones Cables Ltd Improvements in or relating to aircraft antenna
US3475555A (en) * 1966-04-22 1969-10-28 Columbia Broadcasting Syst Inc Dual resolution scanning system using carrier transmission of plural video signals

Cited By (26)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4373162A (en) * 1980-03-10 1983-02-08 Control Data Corporation Low frequency electronically steerable cylindrical slot array radar antenna
US5191351A (en) * 1989-12-29 1993-03-02 Texas Instruments Incorporated Folded broadband antenna with a symmetrical pattern
US5353038A (en) * 1991-04-08 1994-10-04 Bell Helicopter Textron Inc. Automatic direction finder sense antenna
US6054963A (en) * 1996-02-27 2000-04-25 Thomson Licensing S.A. Folded bow-tie antenna
US6002371A (en) * 1996-11-14 1999-12-14 Brother International Corporation Die-cut antenna for cordless telephone radio transceiver
US6621462B2 (en) 1997-09-09 2003-09-16 Time Domain Corporation Ultra-wideband magnetic antenna
US6400329B1 (en) 1997-09-09 2002-06-04 Time Domain Corporation Ultra-wideband magnetic antenna
DE10141583B4 (en) * 2001-08-24 2014-02-13 Heinz Lindenmeier Antenna arrangement in the aperture of an electrically conductive vehicle body
US6703983B2 (en) * 2001-08-29 2004-03-09 Hon Hai Precision Ind. Co., Ltd. Slot antenna having irregular geometric shape
US7221026B2 (en) * 2002-10-02 2007-05-22 Micron Technology, Inc. Computer systems containing resistors which include doped silicon/germanium
US20050045991A1 (en) * 2002-10-02 2005-03-03 Arup Bhattacharyya Computer systems containing resistors which include doped silicon/germanium
US6762730B2 (en) * 2002-10-04 2004-07-13 Spx Corporation Crossed bow tie slot antenna
US20050083238A1 (en) * 2003-10-18 2005-04-21 Kennedy Colm C. Slot antenna
US6982677B2 (en) * 2003-10-18 2006-01-03 Colm C Kennedy Slot antenna
US20050248488A1 (en) * 2004-05-05 2005-11-10 Tdk Corporation Planar antenna
US7042402B2 (en) 2004-05-05 2006-05-09 Tdk Corporation Planar antenna
EP1594187A1 (en) * 2004-05-05 2005-11-09 TDK Corporation Folded laminar antenna
US7081860B2 (en) * 2004-08-10 2006-07-25 Spx Corporation Folded broadcast panel antenna system and method
US20060033672A1 (en) * 2004-08-10 2006-02-16 Spx Corporation Folded broadcast panel antenna system and method
US20080169987A1 (en) * 2006-10-11 2008-07-17 Mcnutt Duane K Shunt antenna for aircraft
US7511674B2 (en) 2006-10-11 2009-03-31 Asb Avionics, Llc. Shunt antenna for aircraft
CN109390681A (en) * 2017-08-08 2019-02-26 波音公司 Structure stacked antenna designs and manufactures
EP3442078B1 (en) * 2017-08-08 2023-05-03 The Boeing Company Structural multilayer antenna design and fabrication
CN110190379A (en) * 2019-05-05 2019-08-30 中国商用飞机有限责任公司 A kind of Airborne High-frequency antenna
WO2020260311A1 (en) * 2019-06-28 2020-12-30 Airbus Operations Gmbh Antenna assembly, vertical tail, horizontal tail, wing, aircraft, and method
US11843164B2 (en) 2019-06-28 2023-12-12 Airbus Operations Gmbh Antenna assembly, vertical tail, horizontal tail, wing, aircraft, and method

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