EP0402005A2 - Flush mount antenna - Google Patents
Flush mount antenna Download PDFInfo
- Publication number
- EP0402005A2 EP0402005A2 EP90305620A EP90305620A EP0402005A2 EP 0402005 A2 EP0402005 A2 EP 0402005A2 EP 90305620 A EP90305620 A EP 90305620A EP 90305620 A EP90305620 A EP 90305620A EP 0402005 A2 EP0402005 A2 EP 0402005A2
- Authority
- EP
- European Patent Office
- Prior art keywords
- antenna
- cavity
- tapered surface
- dielectric
- horn
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
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Classifications
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01Q—ANTENNAS, i.e. RADIO AERIALS
- H01Q9/00—Electrically-short antennas having dimensions not more than twice the operating wavelength and consisting of conductive active radiating elements
- H01Q9/04—Resonant antennas
- H01Q9/0485—Dielectric resonator antennas
-
- 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
Definitions
- This invention relates generally to antennas and more particularly to horn antennas.
- antennas In many radio frequency systems, limited space is available for antennas. Antennas designed for small spaces, however, must meet various performance requirements. For example, the antenna must have a specified angular coverage and frequency bandwidth. Thus, existing antennas may not meet both the size and performance requirements in a system.
- flush mount antennas For example, annular slot antennas, cavity inductors, strip inductors, patch antennas, surface-wave antennas and slot antennas can all be mounted flush with a surface.
- these types of antennas generally have narrow frequency bandwidths. They are thus not well suited for systems requiring frequency bandwidths of 3:1.
- Printed log-periodic dipoles can be cavity backed and flush mounted. These antennas can be built with 3:1 frequency bandwidths, but cannot be made small enough to meet the size constraints of some applications.
- an antenna having a radiating cavity filled with dielectric.
- the radiating cavity has two opposing tapered walls. Radio frequency energy is fed to the radiating cavity via a microstrip horn.
- the dielectric in the radiating cavity conforms with the upper surface of the antenna.
- the upper surface of the antenna in turn, conforms with the surface in which the antenna is mounted.
- FIG. 1 shows an exploded view of an antenna 10 constructed according to the present invention.
- the antenna 10 has a base 12 and a top 20 formed from a conductive metal.
- a dielectric board 14 is mounted, for example by gluing or mounting screws, to the base 12.
- the relative dielectric constant of board 14 is ⁇ rs .
- a microstrip horn 16 is patterned, in a known manner, on the upper surface (not numbered) of dielectric board 14.
- base 12 is at ground potential and forms the second conductor of the microstrip.
- a signal is applied to microstrip horn 16 through feed 28.
- a coaxial cable (not shown) could pass through feed 28 and have its center conductor connected to microstrip horn 16.
- a dielectric slab 18 with relative dielectric constant ⁇ r is also mounted, such as by gluing or captivation by top 20, to base 12.
- Dielectric slab 18 has a tapered surface 34 which conforms to tapered surface 32 of base 12.
- Dielectric slab 18 has a second tapered surface 30 which conforms to a tapered surface (element 50, FIG. 3) in top 20.
- Top 20 is secured to base 12 by screws through screw holes 22 and 24 or by any other convenient means such as conductive epoxy. With top 20 secured to the base, a radiating cavity 26 is formed. The radiating cavity 26 is bounded on the bottom by base 12. Two sides of radiating cavity 26 are bounded by the inside surface of prongs 42A and 42B of top 20. A third side of radiating cavity 26 is bounded by tapered surface 50 (FIG. 3) of top 20. The fourth side of radiating cavity 26 is bounded by tapered surface 32. Dielectric slab 18 thus fills radiating cavity 26.
- top 20 and dielectric slab 40 are constructed to form a flush upper surface.
- upper surfaces 36, 38 and 40 form a surface without discontinuities.
- that surface is shown to be a plane.
- Antenna 10 could thus be recessed into a planar surface to create a flush surface.
- the invention is not limited to a planar flush surface.
- FIG. 2 shows additional details of the antenna 10, as would be seen by looking at the top of antenna 10 (FIG. 1) with top 20 removed.
- like reference numbers denote like elements.
- superimposed on the structure of FIG. 2 is an x-axis and an angle ⁇ AZ measured relative to the x-axis.
- the angle ⁇ AZ indicates the azimuthal direction relative to the antenna 10.
- FIG. 2 also indicates various dimensions of components in antenna 10.
- Dielectric board 14 has a width W S and a length L S .
- Dielectric slab 18 has a width W.
- Upper surface 40 has a length L.
- the total length of dielectric board 14 and dielectric slab 18 is L T .
- FIG. 3 shows a cross-sectional view of antenna 10 taken along the line 3-3 of FIG. 1. Details of top 20 can be seen in FIG. 3.
- Top 20 has a tapered surface 50 which conforms with tapered surface 30 of dielectric slab 18. Additionally, top 20 has formed in it a cavity 54 of length L MC and extending a height H MC above microstrip horn 16. Inside cavity 54, there is an absorber 52, which is any known material which absorbs radio frequency energy. Cavity 54 and absorber 52 present a load to microstrip horn 16 very similar to the load that would be present if microstrip horn 16 were in free space. In addition, absorber 52 is selected to prevent resonance in cavity 54 while absorbing a minimum of RF energy.
- Top 20 is in electrical contact with dielectric horn 16. Electrically, tapered surface 50 is like an extension of microstrip horn 16. Tapered surface 50 therefore launches electrical signals travelling down microstrip horn 16 into radiating cavity 26.
- Dielectric slab 18 is shown to have a height H C .
- the bottom of dielectric slab 18 excluding tapered surface 34 is shown to have a length L B .
- Dielectric board 14 is shown to have a height of t.
- tapered surface 50 is shown to make an angle ⁇ FE with base 12.
- Tapered surface 32 is shown to make an angle ⁇ f with the x-axis.
- angle ⁇ EL is shown. Angle ⁇ EL defines the elevation direction relative to antenna 10.
- the various dimensions of the antenna are selected based on two major considerations. First, the dimensions are selected based on the wavelength, ⁇ 0, of the center frequency, f o , of operation of the antenna. Additionally, some parameters are selected such that antenna 10 projects a beam in the desired azimuthal and elevational angles.
- Table I shows dimensions selected for the various parameters of antenna 10.
- FIG. 4A shows the azimuthal beam pattern resulting when an antenna with the dimensions of Table I is operated at a frequency equal to 0.917f o .
- the abscissa of the plot shows azimuthal angle.
- the ordinate shows the gain relative to an isotropically radiating antenna measured in the far field at the azimuthal angle with the elevation angle of 0°.
- FIG. 4B shows the elevation pattern when an antenna with the dimensions of Table I is operated at a frequency of 0.917f o .
- the abscissa of the plot shows elevation angle.
- the ordinate shows the gain relative to an isotropically radiating antenna measured in the far field at the elevation angle with an azimuthal angle of 0°.
- antenna 10 has a 3dB beamwidth in the azimuthal plane of approximately 160°.
- Line 400B in FIG. 48 shows antenna 10 has a 3dB beamwidth in the elevation plane of approximately 60°. The beam center in the elevation plane occurs at an elevation angle of approximately 20°.
- the performance of antenna 10 can be changed by varying the parameters of antenna construction. If the parameter L is shortened, the 3dB beamwidth in the elevation plane increases. In addition, the beam becomes centered closer to the value of ⁇ EL equal to 90°. In other words, the antenna has a near broadside radiation pattern. Conversely, an increase in L tends to concentrate the beam in the elevation plane closer to values of ⁇ EL near zero. In other words, the antenna has a end-fire radiation pattern.
- FIG. 5 shows an alternative embodiment of the antenna.
- Antenna 10A contains a dielectric slab 10A which tapers outwards away from microstrip horn 16 (not shown). The added width of the taper tends to decrease the 3dB beamwidth in the azimuthal direction.
- FIG. 5 also shows how an antenna can be flush mounted to a surface.
- Antenna 10A is recessed into surface 56.
- surface 56 is curved.
- Upper surface 36A, 38A, and 40A are shaped to conform to surface 56.
- the antenna has been described only in relation to tbe transmission of signals, but could be used to receive signals. Additionally, the antenna has been shown to mount flush with planar or curved surfaces, but could be readily extended to conform to any shape surface.
- the flush mount antenna could be arrayed, resulting in a flush mount array antennas Therefore, the invention should be defined by the spirit and scope of the appended claims.
Abstract
Description
- This invention relates generally to antennas and more particularly to horn antennas.
- In many radio frequency systems, limited space is available for antennas. Antennas designed for small spaces, however, must meet various performance requirements. For example, the antenna must have a specified angular coverage and frequency bandwidth. Thus, existing antennas may not meet both the size and performance requirements in a system.
- One common size constraint in airborne systems is that the antenna not protrude beyond the aircraft carrying the RF system. Thus, a "flush mount" antenna is required.
- Various forms of flush mount antennas are known. For example, annular slot antennas, cavity inductors, strip inductors, patch antennas, surface-wave antennas and slot antennas can all be mounted flush with a surface. However, these types of antennas generally have narrow frequency bandwidths. They are thus not well suited for systems requiring frequency bandwidths of 3:1. Printed log-periodic dipoles can be cavity backed and flush mounted. These antennas can be built with 3:1 frequency bandwidths, but cannot be made small enough to meet the size constraints of some applications.
- It is an object of this invention to provide an antenna that can be mounted flush with a surface.
- It is also an object of this invention to provide an antenna which can conform to non-planar surfaces.
- It is a further object of this invention to provide an antenna with a broad frequency bandwidth and wide angular coverage.
- It is a further object of this invention to provide an antenna which fits in a relatively small volume.
- It is yet a further object of this invention to provide an antenna which can be designed for end-fire or near broadside radiation patterns over a 3:1 frequency bandwidth.
- The foregoing and other objects are achieved by an antenna having a radiating cavity filled with dielectric. The radiating cavity has two opposing tapered walls. Radio frequency energy is fed to the radiating cavity via a microstrip horn. The dielectric in the radiating cavity conforms with the upper surface of the antenna. The upper surface of the antenna, in turn, conforms with the surface in which the antenna is mounted.
- The invention will be better understood by reference to the following more detailed description and accompanying figures in which
- FIG. 1 shows an exploded view of an antenna constructed according to the invention;
- FIG. 2 is the top view of the antenna of FIG. 1 with
top 20 removed; - FIG. 3 is a cross-sectional view of the antenna of FIG. 1 taken along the line 3-3;
- FIG. 4A is a plot showing the azimuthal beam pattern of the antenna of FIG. 1;
- FIG. 4B is a plot showing the elevation beam pattern of the antenna of FIG. 1; and
- FIG. 5 shows another embodiment of the invention mounted in an object with a curved surface.
- FIG. 1 shows an exploded view of an
antenna 10 constructed according to the present invention. Theantenna 10 has abase 12 and atop 20 formed from a conductive metal. - A
dielectric board 14 is mounted, for example by gluing or mounting screws, to thebase 12. The relative dielectric constant ofboard 14 is εrs. Amicrostrip horn 16 is patterned, in a known manner, on the upper surface (not numbered) ofdielectric board 14. In operation,base 12 is at ground potential and forms the second conductor of the microstrip. A signal is applied tomicrostrip horn 16 throughfeed 28. For example, a coaxial cable (not shown) could pass throughfeed 28 and have its center conductor connected tomicrostrip horn 16. - A
dielectric slab 18 with relative dielectric constant εr is also mounted, such as by gluing or captivation bytop 20, tobase 12.Dielectric slab 18 has atapered surface 34 which conforms to taperedsurface 32 ofbase 12.Dielectric slab 18 has a secondtapered surface 30 which conforms to a tapered surface (element 50, FIG. 3) intop 20. - Top 20 is secured to
base 12 by screws throughscrew holes cavity 26 is formed. Theradiating cavity 26 is bounded on the bottom bybase 12. Two sides of radiatingcavity 26 are bounded by the inside surface ofprongs 42A and 42B oftop 20. A third side of radiatingcavity 26 is bounded by tapered surface 50 (FIG. 3) oftop 20. The fourth side of radiatingcavity 26 is bounded bytapered surface 32.Dielectric slab 18 thus fills radiatingcavity 26. - The
base 12,top 20 anddielectric slab 40 are constructed to form a flush upper surface. In particular, with the components ofantenna 10 assembled,upper surfaces Antenna 10 could thus be recessed into a planar surface to create a flush surface. The invention, however, is not limited to a planar flush surface. - FIG. 2 shows additional details of the
antenna 10, as would be seen by looking at the top of antenna 10 (FIG. 1) withtop 20 removed. In all the figures, like reference numbers denote like elements. Superimposed on the structure of FIG. 2 is an x-axis and an angle φAZ measured relative to the x-axis. The angle φAZ indicates the azimuthal direction relative to theantenna 10. - FIG. 2 also indicates various dimensions of components in
antenna 10.Dielectric board 14 has a width WS and a length LS.Dielectric slab 18 has a width W.Upper surface 40 has a length L. The total length ofdielectric board 14 anddielectric slab 18 is LT. - FIG. 3 shows a cross-sectional view of
antenna 10 taken along the line 3-3 of FIG. 1. Details of top 20 can be seen in FIG. 3.Top 20 has a taperedsurface 50 which conforms with taperedsurface 30 ofdielectric slab 18. Additionally, top 20 has formed in it acavity 54 of length LMC and extending a height HMC abovemicrostrip horn 16. Insidecavity 54, there is anabsorber 52, which is any known material which absorbs radio frequency energy.Cavity 54 andabsorber 52 present a load tomicrostrip horn 16 very similar to the load that would be present ifmicrostrip horn 16 were in free space. In addition,absorber 52 is selected to prevent resonance incavity 54 while absorbing a minimum of RF energy. -
Top 20 is in electrical contact withdielectric horn 16. Electrically, taperedsurface 50 is like an extension ofmicrostrip horn 16. Taperedsurface 50 therefore launches electrical signals travelling downmicrostrip horn 16 into radiatingcavity 26. - Various other dimensions of
antenna 10 are shown in FIG. 3.Dielectric slab 18 is shown to have a height HC. The bottom ofdielectric slab 18 excluding taperedsurface 34 is shown to have a length LB. Dielectric board 14 is shown to have a height of t. In addition, taperedsurface 50 is shown to make an angle αFE withbase 12. Taperedsurface 32 is shown to make an angle αf with the x-axis. Also, the angle ϑEL is shown. Angle ϑEL defines the elevation direction relative toantenna 10. - In constructing an antenna according to the invention, the various dimensions of the antenna are selected based on two major considerations. First, the dimensions are selected based on the wavelength, λ₀, of the center frequency, fo, of operation of the antenna. Additionally, some parameters are selected such that
antenna 10 projects a beam in the desired azimuthal and elevational angles. - As an example, Table I shows dimensions selected for the various parameters of
antenna 10. FIG. 4A shows the azimuthal beam pattern resulting when an antenna with the dimensions of Table I is operated at a frequency equal to 0.917fo. The abscissa of the plot shows azimuthal angle. The ordinate shows the gain relative to an isotropically radiating antenna measured in the far field at the azimuthal angle with the elevation angle of 0°. - FIG. 4B shows the elevation pattern when an antenna with the dimensions of Table I is operated at a frequency of 0.917fo. The abscissa of the plot shows elevation angle. The ordinate shows the gain relative to an isotropically radiating antenna measured in the far field at the elevation angle with an azimuthal angle of 0°.
TABLE I ANTENNA PARAMETER DIMENSIONS L 1.17 λ₀ W 0.51 λ₀ LB 0.61 λ₀ H 0.31 λ₀ t 0.03 λ₀ HC 0.19 λ₀ HMC 0.18 λ₀ WS 0.51 λ₀ LS 0.39 λ₀ LMC 0.36 λ₀ LT 1.78 λ₀ αFE 40.4° αF 14.9° εr 3.0 εrs 2.22 - As seen by
line 400A in FIG. 4A,antenna 10 has a 3dB beamwidth in the azimuthal plane of approximately 160°.Line 400B in FIG. 48shows antenna 10 has a 3dB beamwidth in the elevation plane of approximately 60°. The beam center in the elevation plane occurs at an elevation angle of approximately 20°. - The performance of
antenna 10 can be changed by varying the parameters of antenna construction. If the parameter L is shortened, the 3dB beamwidth in the elevation plane increases. In addition, the beam becomes centered closer to the value of ϑEL equal to 90°. In other words, the antenna has a near broadside radiation pattern. Conversely, an increase in L tends to concentrate the beam in the elevation plane closer to values of ϑEL near zero. In other words, the antenna has a end-fire radiation pattern. - Additionally, the width W of
dielectric slab 18 can be varied. Increasing the value of W tends to decrease the 3dB beamwidth in the azimuthal plane. FIG. 5 shows an alternative embodiment of the antenna. Antenna 10A contains a dielectric slab 10A which tapers outwards away from microstrip horn 16 (not shown). The added width of the taper tends to decrease the 3dB beamwidth in the azimuthal direction. - Near hemispherical elevation coverage over ϑEL = 0° to ϑEL = 170° can be achieved by varying some of the parmeters shown in Table I. With L = 0.53λ₀ and εr = 6, there will be less than 8dB of gain variation and a front to back ratio of less than 3.5dB (at ϑEL = 20° and ϑEL = 160°). An antenna constructed with the dimensions oi this example can achieve an impedance matched peak gain of not less than 2dBi and a half power beamwidth of not less than 62° measured in the plane ϑEL = 0° over a 3:1 frequency band.
- FIG. 5 also shows how an antenna can be flush mounted to a surface. Antenna 10A is recessed into
surface 56. Here,surface 56 is curved.Upper surface - Having described embodiments of the invention, it will be apparent to one of skill in the art that various modifications to the disclosed embodiments could be made. For example, the antenna has been described only in relation to tbe transmission of signals, but could be used to receive signals. Additionally, the antenna has been shown to mount flush with planar or curved surfaces, but could be readily extended to conform to any shape surface. The flush mount antenna could be arrayed, resulting in a flush mount array antennas Therefore, the invention should be defined by the spirit and scope of the appended claims.
Claims (18)
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US36440489A | 1989-06-09 | 1989-06-09 | |
US364404 | 1989-06-09 |
Publications (3)
Publication Number | Publication Date |
---|---|
EP0402005A2 true EP0402005A2 (en) | 1990-12-12 |
EP0402005A3 EP0402005A3 (en) | 1991-05-15 |
EP0402005B1 EP0402005B1 (en) | 1995-12-13 |
Family
ID=23434390
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP90305620A Expired - Lifetime EP0402005B1 (en) | 1989-06-09 | 1990-05-23 | Flush mount antenna |
Country Status (4)
Country | Link |
---|---|
EP (1) | EP0402005B1 (en) |
JP (1) | JP3045522B2 (en) |
DE (1) | DE69024103T2 (en) |
IL (1) | IL94458A0 (en) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO2016053395A1 (en) * | 2014-08-29 | 2016-04-07 | Raytheon Company | Directive artificial magnetic conductor (amc) dielectric wedge waveguide antenna |
Families Citing this family (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE10322803A1 (en) * | 2003-05-19 | 2004-12-23 | Otto-Von-Guericke-Universität Magdeburg | Microstrip- or patch antenna for modern high capacity communication systems, comprises radiator with resonant cavity at rear and miniature horn surrounding it |
CN103606732B (en) * | 2013-11-29 | 2016-02-10 | 东南大学 | Thin substrate phase amplitude corrects surface of oscillator horn antenna |
CN103956566B (en) * | 2014-05-14 | 2016-04-27 | 武汉虹信通信技术有限责任公司 | A kind of miniaturized broadband radiating unit being applicable to TD-LTE antenna |
Citations (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US2822542A (en) * | 1954-10-18 | 1958-02-04 | Motorola Inc | Directive antenna |
FR2445042A1 (en) * | 1978-12-21 | 1980-07-18 | Onera (Off Nat Aerospatiale) | Antennae with ancillary PTFE strips and patches - to enhance millimetre wavelength signals by acting as axial and lateral reflectors |
GB1598545A (en) * | 1975-09-03 | 1981-09-23 | Marconi Co Ltd | Waveguide aerials |
US4415900A (en) * | 1981-12-28 | 1983-11-15 | The United States Of America As Represented By The Secretary Of The Navy | Cavity/microstrip multi-mode antenna |
-
1990
- 1990-05-21 IL IL94458A patent/IL94458A0/en not_active IP Right Cessation
- 1990-05-23 DE DE69024103T patent/DE69024103T2/en not_active Expired - Lifetime
- 1990-05-23 EP EP90305620A patent/EP0402005B1/en not_active Expired - Lifetime
- 1990-06-07 JP JP2149706A patent/JP3045522B2/en not_active Expired - Lifetime
Patent Citations (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US2822542A (en) * | 1954-10-18 | 1958-02-04 | Motorola Inc | Directive antenna |
GB1598545A (en) * | 1975-09-03 | 1981-09-23 | Marconi Co Ltd | Waveguide aerials |
FR2445042A1 (en) * | 1978-12-21 | 1980-07-18 | Onera (Off Nat Aerospatiale) | Antennae with ancillary PTFE strips and patches - to enhance millimetre wavelength signals by acting as axial and lateral reflectors |
US4415900A (en) * | 1981-12-28 | 1983-11-15 | The United States Of America As Represented By The Secretary Of The Navy | Cavity/microstrip multi-mode antenna |
Cited By (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO2016053395A1 (en) * | 2014-08-29 | 2016-04-07 | Raytheon Company | Directive artificial magnetic conductor (amc) dielectric wedge waveguide antenna |
US10297919B2 (en) | 2014-08-29 | 2019-05-21 | Raytheon Company | Directive artificial magnetic conductor (AMC) dielectric wedge waveguide antenna |
EP3886253A1 (en) * | 2014-08-29 | 2021-09-29 | Raytheon Company | Directive artificial magnetic conductor (amc) dielectric wedge waveguide antenna |
Also Published As
Publication number | Publication date |
---|---|
IL94458A0 (en) | 1991-03-10 |
DE69024103D1 (en) | 1996-01-25 |
JPH0326101A (en) | 1991-02-04 |
EP0402005A3 (en) | 1991-05-15 |
JP3045522B2 (en) | 2000-05-29 |
DE69024103T2 (en) | 1996-08-29 |
EP0402005B1 (en) | 1995-12-13 |
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