CA1157146A - Antenna feedhorn having an elliptical radiation pattern - Google Patents
Antenna feedhorn having an elliptical radiation patternInfo
- Publication number
- CA1157146A CA1157146A CA000372523A CA372523A CA1157146A CA 1157146 A CA1157146 A CA 1157146A CA 000372523 A CA000372523 A CA 000372523A CA 372523 A CA372523 A CA 372523A CA 1157146 A CA1157146 A CA 1157146A
- Authority
- CA
- Canada
- Prior art keywords
- section
- sides
- corrugations
- cross
- internal surface
- 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.)
- Expired
Links
Classifications
-
- 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
- H01Q13/02—Waveguide horns
- H01Q13/0208—Corrugated horns
-
- 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
- H01Q13/02—Waveguide horns
- H01Q13/0208—Corrugated horns
- H01Q13/0225—Corrugated horns of non-circular cross-section
Landscapes
- Waveguide Aerials (AREA)
Abstract
ABSTRACT OF THE DISCLOSURE
An antenna feedhorn having an elliptical radiation pattern which comprises a hybrid mode exciting section and a horn radiator positioned adjac-ent thereto. The adjacent ends of the exciting section and the horn radiation have identical circular cross sections. The other end of the horn radiator has an aperture cross section which comprises a pair of straight, spaced, parallel sides of identical length and a pair of spaced arcuate sides inter-posed between the straight parallel sides, the cross section of the horn rad-iator changing continuously from the end adjacent the exciting section to the aperture end. The horn radiator is further provided with an internal surface having corrugations therein. The depth of the corrugations is constant in each cross sectional plane of the radiator in the portions of the internal sur-face comprising the straight parallel sides, and the depth of the corrugations in each cross sectional plane of the radiator in the portions of the internal surface comprising the arcuate sides decreases, increases or remains unchanged toward the center of the arcuate sides for different embodiments of the in-vention. This antenna feedhorn has a cross-polarization component which is less than the cross-polarization component of an elliptical shaped corrugated horn according to the state of the art.
An antenna feedhorn having an elliptical radiation pattern which comprises a hybrid mode exciting section and a horn radiator positioned adjac-ent thereto. The adjacent ends of the exciting section and the horn radiation have identical circular cross sections. The other end of the horn radiator has an aperture cross section which comprises a pair of straight, spaced, parallel sides of identical length and a pair of spaced arcuate sides inter-posed between the straight parallel sides, the cross section of the horn rad-iator changing continuously from the end adjacent the exciting section to the aperture end. The horn radiator is further provided with an internal surface having corrugations therein. The depth of the corrugations is constant in each cross sectional plane of the radiator in the portions of the internal sur-face comprising the straight parallel sides, and the depth of the corrugations in each cross sectional plane of the radiator in the portions of the internal surface comprising the arcuate sides decreases, increases or remains unchanged toward the center of the arcuate sides for different embodiments of the in-vention. This antenna feedhorn has a cross-polarization component which is less than the cross-polarization component of an elliptical shaped corrugated horn according to the state of the art.
Description
1157~46 BACKGROUND OF THE INVENTION
The present invention relates to an antenna feedhorn having an ellip-tical radiation pattern. In particular, it relates to an antenna feedhorn comprising a hybrid mode exciting section provided with a corrugated structure and having a circular cross section followed by a horn radiator which is like-wise provided with a corrugated structure.
Antenna feedhorns having elliptical radiation patterns are used in television satellites which cover a given geographic area with an elliptical field. For example, Electronics Letters, Vol. 15, No. 20, 27th September 1979, pp 652-654 discloses for this purpose a horn radiator with an elliptical aperture having a corrugated structure. The cross section of the horn radi-ator changes continuously from the circular cross section of the exciting section to the elliptical cross section of the aperture.
In such antenna feedhorns for producing linearly or circularly polari-zed radiation fields with elliptical cross sections, there exists the require-ment for the lowest possible crosspolarization component, identical lobe widths in the E and H, planes of the radiation field and a minimum phase shift between the polarization planes. However, radiators having elliptical cross sections have the disadvantage that higher undesirable hybrid modes are excited which cause an increase in the crosspolarization component. This is particularly the case when the ratio of the major axis to the minor axis of the ellipse is very large. Moreover, the manufacture of an elliptical horn radiator with a corru-gated structure in its interior is rather complicated and expensive.
It is an object of the present invention to provide an antenna feed-horn having an elliptical radiation pattern wherein the horn radiator ~' ~57~46 structureis such that the crosspolarization c~mponent is minimal and man-ufacture of t~e feedhorn is simple.
s~ o~ n~ wr~
ln accordance with the present invention, an antenna feedhorn is pro~ided having an elliptical radiation pattern which comprises a hybrid mode exciting section and a horn radiator positioned adjacent hereto. The adjacent ends of the exciting section and the horn radiator have identical circular cross sections. The other end of the horn radiator has an aperture cross section which comprises a pair of straight, spaced, parallel sides of identical length and a pair of spaced arcuate sides interposed between the straight parallel sides, the cross section of the horn radiator changing continuously from the end adjacent the exciting section to the aperture end.
The horn radiator is further provided ~ith an internal surface having corrugations therein. The depth of the corrugations is constant in each cross sectional plane of the radiator in the portions of the internal surface comprising the straight parallel sides, and the depth of the corru-gations in each cross sectional plane of the radiator in the portions of the internal surface comprising the arcuate sides decreases, increases or remains unchanged toward the center of the arcuate sides for different embodiments of the invention.
In one embodiment of the in~ention, the arcuate cross sectional sides of the horn radiator are in the form of semicircles and, over the en-t~re length of the horn radiator, the distance between the two identical length, straight, parallel cross sectional sides is equal to the diameter of the cir-cular hybrid mode exciting section. rn another embodiment, the distance be-tween these two CTOSS sectional s~des increases continuously from the dia-meter of the round hybrid mode exciting section to the aperture.
~57~46 ~ D~5C~I~II0~ 0~ TU- D~A~
Figure 1 is a perspective view of an antenna feedhorn.
Figures 2 and 3 show partially cut-open side views of two antenna feedhorns with cross sections of different size, Figure 4 is partially cut-open top view of the antenna feedhorn.
Figure 5a, b, c, are sectional views along the line A-A trans-versely through the horn radiator with different corrugated stTuctures in its interior.
D Pigure 1 shows a schematic representation of an antenna feedhorn comprising a circular hybrid mode exciting section 1 which may be connected by a cross section adaptor to a square waveguide ~not shown) having a corru-gated structure in its interior. A structure of this type is disclosed in ~erman Patent No. 2,616,125. Such a hybrid mode exciting section has the advantage that is is very broadbanded and has a low crosspolarization com-ponent and phase shift between the polarization planes.
T~e hybrid mode exciting section 1 is positioned ad~acent a horn radiator 2, the horn radiator 2 having a c~rcular cross section at one end 10 whlch is matched to the circular cross section of the hybrid mode exciting O section 1. Toward the aperture end 12 o~ the radiator, the circular cross sect~on changes continuously to a cross sect~on w~ich has two spaced, identical length, stralght, parallel sides 3 and 4 which are connected by two seml-circular sides 5 and 6. As shown in Figure 1, the aperture cross section is similaT t~ a rectangle in which two opposite sides have been replaced by two semlcircular sides.
~igure 2 is a 5tde vlew of an antenna feedhorn having a horn rad-iator 7 in which the distance between the two straight cross sectional sides ~57~46 3 and 4 is equal over its entire length to the diameter of the circular cross section of the hybrid mode exciting section 1. Figure 3 is a side view of an antenna feedhorn having a horn radiator 8 in which the distance between the two straight cross sectional sides 3 and 4 linearly increases toward the aper-ture end 12 from the diameter of the circular hybrid mode exciting section at end 10. Figure 4 shows a top view of an antenna feedhorn~
For showing the corrugated structure disposed in the interiors of the hybrid mode exciting section 1 this section 1 in Figure 2 is cut open in part. In this performance of section 1 the depth of the corrugations in each ) cross sectional plane is constant.
Figures 2, 3 and 4 show the antenna feedhorns cut open in part in the area of the horn radiators 7, 8 and 2 respectively so that the corrugated structure disposed in the interiors of the horn radiators can be seen~ The illustrated CTOSS sectional shapes of the horn radiators result in the horn radiator walls having different shapes in each cross-sectional plane since the cross sectional shape of the horn radiator is not circularly symmetrical. The slope of the horn radiator walls in the area of the semicircular cross sectional s~des (see Figure 4) is greater than in the region of the straight cross sectional sides (see Figures 2 and 3). The resulting non-constant groove depth O within each cross sectional plane and the difference in the width of the rad-~ation lobes in the E and H planes resulting therefrom is compensated by a gradual reduction of the corrugation depth tl in the region of the straight cross sec~ional sides toward the center of the arcute sides to a depth of t2;
that ~s t2 is less than tl~ The corrugation depth may also be of identical size at all sides of one cross section or there may be an increase in the corrugation depth toward the center of the ~rcuate sides~ Depending on the actual shape of the horn radiator, the different described corrugation depths ~57~46 ~ill provide ad~antageous compensati~on for d~f~erent radiation lobe ~idths in the E and H planes.
Sectional views along the line A-A of Figure 4 are shown in Figures 5a, 5b, 5c. Figure 5a depicts the transition from the largest constant corru-gation depth tl in the region of the straight cross sectional sides 3 and 4 to the smallest groove depth t2 in the region of the apex of the arcuate sides 5 and 6 (tl > t2). The corrugation shown in Pigure 5b has the same depth in the region of the straight cross sectional sides 3 and 4 and in the region of the arcuate sides 5 and 6 ~tl = t2). Figure 5c shows another corrugation which depth tl in the region of the straight cross sectional sides 3 and 4 is smaller than the depth t2 in the region of the apex of the arcuate sides 5 and 6 ~tl ~ t2)' Due to its cross section, the horn radiator of the present invention can be manufactured more easily and economically w~th only straight and arcuate sides than a feedhorn having an elliptical cross section~ This is because manufacture of the elliptical cross section feedhorn requires working with a cutting tool, this being a particular problem in connection with fabrication of the corrugated structure.
The present invention relates to an antenna feedhorn having an ellip-tical radiation pattern. In particular, it relates to an antenna feedhorn comprising a hybrid mode exciting section provided with a corrugated structure and having a circular cross section followed by a horn radiator which is like-wise provided with a corrugated structure.
Antenna feedhorns having elliptical radiation patterns are used in television satellites which cover a given geographic area with an elliptical field. For example, Electronics Letters, Vol. 15, No. 20, 27th September 1979, pp 652-654 discloses for this purpose a horn radiator with an elliptical aperture having a corrugated structure. The cross section of the horn radi-ator changes continuously from the circular cross section of the exciting section to the elliptical cross section of the aperture.
In such antenna feedhorns for producing linearly or circularly polari-zed radiation fields with elliptical cross sections, there exists the require-ment for the lowest possible crosspolarization component, identical lobe widths in the E and H, planes of the radiation field and a minimum phase shift between the polarization planes. However, radiators having elliptical cross sections have the disadvantage that higher undesirable hybrid modes are excited which cause an increase in the crosspolarization component. This is particularly the case when the ratio of the major axis to the minor axis of the ellipse is very large. Moreover, the manufacture of an elliptical horn radiator with a corru-gated structure in its interior is rather complicated and expensive.
It is an object of the present invention to provide an antenna feed-horn having an elliptical radiation pattern wherein the horn radiator ~' ~57~46 structureis such that the crosspolarization c~mponent is minimal and man-ufacture of t~e feedhorn is simple.
s~ o~ n~ wr~
ln accordance with the present invention, an antenna feedhorn is pro~ided having an elliptical radiation pattern which comprises a hybrid mode exciting section and a horn radiator positioned adjacent hereto. The adjacent ends of the exciting section and the horn radiator have identical circular cross sections. The other end of the horn radiator has an aperture cross section which comprises a pair of straight, spaced, parallel sides of identical length and a pair of spaced arcuate sides interposed between the straight parallel sides, the cross section of the horn radiator changing continuously from the end adjacent the exciting section to the aperture end.
The horn radiator is further provided ~ith an internal surface having corrugations therein. The depth of the corrugations is constant in each cross sectional plane of the radiator in the portions of the internal surface comprising the straight parallel sides, and the depth of the corru-gations in each cross sectional plane of the radiator in the portions of the internal surface comprising the arcuate sides decreases, increases or remains unchanged toward the center of the arcuate sides for different embodiments of the invention.
In one embodiment of the in~ention, the arcuate cross sectional sides of the horn radiator are in the form of semicircles and, over the en-t~re length of the horn radiator, the distance between the two identical length, straight, parallel cross sectional sides is equal to the diameter of the cir-cular hybrid mode exciting section. rn another embodiment, the distance be-tween these two CTOSS sectional s~des increases continuously from the dia-meter of the round hybrid mode exciting section to the aperture.
~57~46 ~ D~5C~I~II0~ 0~ TU- D~A~
Figure 1 is a perspective view of an antenna feedhorn.
Figures 2 and 3 show partially cut-open side views of two antenna feedhorns with cross sections of different size, Figure 4 is partially cut-open top view of the antenna feedhorn.
Figure 5a, b, c, are sectional views along the line A-A trans-versely through the horn radiator with different corrugated stTuctures in its interior.
D Pigure 1 shows a schematic representation of an antenna feedhorn comprising a circular hybrid mode exciting section 1 which may be connected by a cross section adaptor to a square waveguide ~not shown) having a corru-gated structure in its interior. A structure of this type is disclosed in ~erman Patent No. 2,616,125. Such a hybrid mode exciting section has the advantage that is is very broadbanded and has a low crosspolarization com-ponent and phase shift between the polarization planes.
T~e hybrid mode exciting section 1 is positioned ad~acent a horn radiator 2, the horn radiator 2 having a c~rcular cross section at one end 10 whlch is matched to the circular cross section of the hybrid mode exciting O section 1. Toward the aperture end 12 o~ the radiator, the circular cross sect~on changes continuously to a cross sect~on w~ich has two spaced, identical length, stralght, parallel sides 3 and 4 which are connected by two seml-circular sides 5 and 6. As shown in Figure 1, the aperture cross section is similaT t~ a rectangle in which two opposite sides have been replaced by two semlcircular sides.
~igure 2 is a 5tde vlew of an antenna feedhorn having a horn rad-iator 7 in which the distance between the two straight cross sectional sides ~57~46 3 and 4 is equal over its entire length to the diameter of the circular cross section of the hybrid mode exciting section 1. Figure 3 is a side view of an antenna feedhorn having a horn radiator 8 in which the distance between the two straight cross sectional sides 3 and 4 linearly increases toward the aper-ture end 12 from the diameter of the circular hybrid mode exciting section at end 10. Figure 4 shows a top view of an antenna feedhorn~
For showing the corrugated structure disposed in the interiors of the hybrid mode exciting section 1 this section 1 in Figure 2 is cut open in part. In this performance of section 1 the depth of the corrugations in each ) cross sectional plane is constant.
Figures 2, 3 and 4 show the antenna feedhorns cut open in part in the area of the horn radiators 7, 8 and 2 respectively so that the corrugated structure disposed in the interiors of the horn radiators can be seen~ The illustrated CTOSS sectional shapes of the horn radiators result in the horn radiator walls having different shapes in each cross-sectional plane since the cross sectional shape of the horn radiator is not circularly symmetrical. The slope of the horn radiator walls in the area of the semicircular cross sectional s~des (see Figure 4) is greater than in the region of the straight cross sectional sides (see Figures 2 and 3). The resulting non-constant groove depth O within each cross sectional plane and the difference in the width of the rad-~ation lobes in the E and H planes resulting therefrom is compensated by a gradual reduction of the corrugation depth tl in the region of the straight cross sec~ional sides toward the center of the arcute sides to a depth of t2;
that ~s t2 is less than tl~ The corrugation depth may also be of identical size at all sides of one cross section or there may be an increase in the corrugation depth toward the center of the ~rcuate sides~ Depending on the actual shape of the horn radiator, the different described corrugation depths ~57~46 ~ill provide ad~antageous compensati~on for d~f~erent radiation lobe ~idths in the E and H planes.
Sectional views along the line A-A of Figure 4 are shown in Figures 5a, 5b, 5c. Figure 5a depicts the transition from the largest constant corru-gation depth tl in the region of the straight cross sectional sides 3 and 4 to the smallest groove depth t2 in the region of the apex of the arcuate sides 5 and 6 (tl > t2). The corrugation shown in Pigure 5b has the same depth in the region of the straight cross sectional sides 3 and 4 and in the region of the arcuate sides 5 and 6 ~tl = t2). Figure 5c shows another corrugation which depth tl in the region of the straight cross sectional sides 3 and 4 is smaller than the depth t2 in the region of the apex of the arcuate sides 5 and 6 ~tl ~ t2)' Due to its cross section, the horn radiator of the present invention can be manufactured more easily and economically w~th only straight and arcuate sides than a feedhorn having an elliptical cross section~ This is because manufacture of the elliptical cross section feedhorn requires working with a cutting tool, this being a particular problem in connection with fabrication of the corrugated structure.
Claims (9)
PROPERTY OR PRIVILEGE IS CLAIMED ARE DEFINED AS FOLLOWS:
1. An antenna feedhorn having an elliptical radiation pattern, comprising:
a hybrid mode exciting section having a circular cross section at at least one end thereof; and a horn radiator positioned adjacent said one end of said hybrid mode exciting section, said radiator having the same circular cross section as said exciting section at the end adjacent to said exciting section, and having an aperture cross section at the other end which comprises a pair of spaced, straight, paralled sides of identical length and a pair of spaced arcuate sides interposed between said straight parallel sides, the cross section of said horn radiator changing continuously from said one end to said other end, said horn radiator further having an internal surface with corru-gations therein, the depth of said corrugations being constant in each cross sectional plane of said radiator in the portions of said internal surface comprising said straight parallel sides.
a hybrid mode exciting section having a circular cross section at at least one end thereof; and a horn radiator positioned adjacent said one end of said hybrid mode exciting section, said radiator having the same circular cross section as said exciting section at the end adjacent to said exciting section, and having an aperture cross section at the other end which comprises a pair of spaced, straight, paralled sides of identical length and a pair of spaced arcuate sides interposed between said straight parallel sides, the cross section of said horn radiator changing continuously from said one end to said other end, said horn radiator further having an internal surface with corru-gations therein, the depth of said corrugations being constant in each cross sectional plane of said radiator in the portions of said internal surface comprising said straight parallel sides.
2. An antenna feedhorn as defined in claim 1 wherein the depth of said corrugations in the portions of said internal surface comprising said arcuate sides is the same as the depth of said corrugations in the portions of said internal surface comprising said straight parallel sides.
3. An antenna feedhorn as defined in claim 1 wherein the depth of said corrugations in the portions of said internal surface comprising said arcuate sides changes from a depth at the ends thereof equal to that of the corru-gations in the portions of said internal surfaces comprising said straight parallel sides to a different depth at the centers of said arcuate sides.
4. An antenna feedhorn as defined in claim 3 wherein the depth of the corrugations in the portions of said internal surface comprising said arcuate sides is less at the center thereof than that of the corrugations in the sections of said internal surface comprising said straight parallel sides.
5. An antenna feedhorn as defined in claim 3 wherein the depth of the corrugations in the portions of said internal surface comprising said arcuate sides is greater at the center thereof than that of the corrugations in the sections of said internal surface comprising said straight parallel sides.
6. An antenna feedhorn as defined in claim 1, 2 or 3 wherein said arcuate cross sectional sides are in the form of semicircles.
7. An antenna feedhorn as defined in claim 1, 2 or 3 wherein the distance between said pair of spaced, straight, parallel sides is equal to the diameter of said hybrid mode exciting section over its entire length.
8. An antenna feedhorn as defined in claim 1, 2 or 3 wherein the distance between said pair of spaced, straight, parallel sides increases continuously from the end adjacent said exciting section toward the other end having said aperture cross section.
9. An antenna feedhorn as defined in claim 1 wherein said hybrid mode exciting section is provided with an internal surface having corrugations therein.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE3009254A DE3009254C2 (en) | 1980-03-11 | 1980-03-11 | Antenna exciter with a radiation pattern of elliptical cross-section |
| DEP3009254.7 | 1980-03-11 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA1157146A true CA1157146A (en) | 1983-11-15 |
Family
ID=6096840
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA000372523A Expired CA1157146A (en) | 1980-03-11 | 1981-03-09 | Antenna feedhorn having an elliptical radiation pattern |
Country Status (4)
| Country | Link |
|---|---|
| CA (1) | CA1157146A (en) |
| DE (1) | DE3009254C2 (en) |
| FR (1) | FR2478381A1 (en) |
| IT (1) | IT1138987B (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4783665A (en) * | 1985-02-28 | 1988-11-08 | Erik Lier | Hybrid mode horn antennas |
Families Citing this family (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE3109667A1 (en) * | 1981-03-13 | 1982-09-23 | Licentia Patent-Verwaltungs-Gmbh, 6000 Frankfurt | "WIDE-BAND GROOVED HORN SPOTLIGHT" |
| JPH0770886B2 (en) * | 1984-08-22 | 1995-07-31 | 日本電気株式会社 | Elliptical corrugated feeder |
| DE4009322A1 (en) * | 1990-03-23 | 1991-09-26 | Ant Nachrichtentech | Supply system for angle diversity operation of dish reflector antenna - has pair of horns between dish and sub-reflector defining angle between them |
| US5552797A (en) * | 1994-12-02 | 1996-09-03 | Avnet, Inc. | Die-castable corrugated horns providing elliptical beams |
| CN105789911B (en) * | 2016-04-20 | 2019-03-19 | 四川中测微格科技有限公司 | Circular polarisation elliptical beam circular array electromagnetic horn unit |
Family Cites Families (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB1179392A (en) * | 1966-01-31 | 1970-01-28 | Mini Of Technology | Improvements in or relating to Horn Aerials |
| DE2616125C3 (en) * | 1976-04-13 | 1979-12-20 | Licentia Patent-Verwaltungs-Gmbh, 6000 Frankfurt | Broadband hybrid mode converter |
-
1980
- 1980-03-11 DE DE3009254A patent/DE3009254C2/en not_active Expired
-
1981
- 1981-03-02 IT IT20075/81A patent/IT1138987B/en active
- 1981-03-09 CA CA000372523A patent/CA1157146A/en not_active Expired
- 1981-03-11 FR FR8104893A patent/FR2478381A1/en active Granted
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4783665A (en) * | 1985-02-28 | 1988-11-08 | Erik Lier | Hybrid mode horn antennas |
Also Published As
| Publication number | Publication date |
|---|---|
| FR2478381A1 (en) | 1981-09-18 |
| DE3009254C2 (en) | 1982-07-08 |
| FR2478381B1 (en) | 1984-02-10 |
| IT8120075A0 (en) | 1981-03-02 |
| IT1138987B (en) | 1986-09-17 |
| DE3009254A1 (en) | 1981-10-01 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| MKEX | Expiry |