CN109103587B - Four-arm spiral antenna - Google Patents
Four-arm spiral antenna Download PDFInfo
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- CN109103587B CN109103587B CN201810887450.5A CN201810887450A CN109103587B CN 109103587 B CN109103587 B CN 109103587B CN 201810887450 A CN201810887450 A CN 201810887450A CN 109103587 B CN109103587 B CN 109103587B
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- 239000000463 material Substances 0.000 claims description 3
- 239000004593 Epoxy Substances 0.000 claims 1
- 239000011152 fibreglass Substances 0.000 claims 1
- 238000010586 diagram Methods 0.000 description 6
- 230000005855 radiation Effects 0.000 description 6
- 238000012986 modification Methods 0.000 description 4
- 230000004048 modification Effects 0.000 description 4
- 230000002349 favourable effect Effects 0.000 description 3
- 230000004075 alteration Effects 0.000 description 2
- 238000004891 communication Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 239000003822 epoxy resin Substances 0.000 description 2
- 239000003365 glass fiber Substances 0.000 description 2
- 239000011810 insulating material Substances 0.000 description 2
- 238000000034 method Methods 0.000 description 2
- 230000010287 polarization Effects 0.000 description 2
- 229920000647 polyepoxide Polymers 0.000 description 2
- 230000008569 process Effects 0.000 description 2
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 1
- 230000002238 attenuated effect Effects 0.000 description 1
- 239000011889 copper foil Substances 0.000 description 1
- 239000005433 ionosphere Substances 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 229910052751 metal Inorganic materials 0.000 description 1
- 239000011295 pitch Substances 0.000 description 1
- 229920000515 polycarbonate Polymers 0.000 description 1
- 239000004417 polycarbonate Substances 0.000 description 1
- 239000005436 troposphere Substances 0.000 description 1
Classifications
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01Q—ANTENNAS, i.e. RADIO AERIALS
- H01Q1/00—Details of, or arrangements associated with, antennas
- H01Q1/36—Structural form of radiating elements, e.g. cone, spiral, umbrella; Particular materials used therewith
- H01Q1/38—Structural form of radiating elements, e.g. cone, spiral, umbrella; Particular materials used therewith formed by a conductive layer on an insulating support
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01Q—ANTENNAS, i.e. RADIO AERIALS
- H01Q1/00—Details of, or arrangements associated with, antennas
- H01Q1/08—Means for collapsing antennas or parts thereof
- H01Q1/085—Flexible aerials; Whip aerials with a resilient base
- H01Q1/087—Extensible roll- up aerials
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01Q—ANTENNAS, i.e. RADIO AERIALS
- H01Q1/00—Details of, or arrangements associated with, antennas
- H01Q1/42—Housings not intimately mechanically associated with radiating elements, e.g. radome
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01Q—ANTENNAS, i.e. RADIO AERIALS
- H01Q1/00—Details of, or arrangements associated with, antennas
- H01Q1/50—Structural association of antennas with earthing switches, lead-in devices or lightning protectors
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01Q—ANTENNAS, i.e. RADIO AERIALS
- H01Q1/00—Details of, or arrangements associated with, antennas
- H01Q1/52—Means for reducing coupling between antennas; Means for reducing coupling between an antenna and another structure
- H01Q1/526—Electromagnetic shields
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- Physics & Mathematics (AREA)
- Electromagnetism (AREA)
- Details Of Aerials (AREA)
Abstract
The invention discloses a novel antenna, which comprises: a passive unit and an active unit; the passive unit comprises a spiral arm for radiating or receiving electromagnetic waves; the active unit comprises a first printed circuit board and a second printed circuit board; the first printed circuit board and the second printed circuit board are stacked at intervals; the feed port of the spiral arm is connected with the feed circuit of the first printed circuit board; the first printed circuit board is electrically connected with the second printed circuit board; the second printed circuit board is provided with an amplifying circuit and a connector, and the amplifying circuit is used for amplifying signals received from the first printed circuit board and outputting the signals through the connector.
Description
Technical Field
The invention relates to the technical field of satellite navigation, in particular to a four-arm spiral antenna.
Background
The quadrifilar helix antenna, which was proposed by Kilgus, university of johnhopkins, usa, in 1968, has a cardioid pattern, no need of any ground, good front-to-back ratio, and excellent circular polarization characteristics, and thus is widely used in satellite communication systems, and is particularly considered as an ideal global positioning system (Global Position System, GPS), beidou satellite navigation system (BeiDou Navigation Satellite System, BDS), and satellite phone receiving antenna.
Currently, the antenna performance of miniaturized quadrifilar helix antennas still needs to be improved to accommodate the needs of modern communications.
Disclosure of Invention
The embodiment of the invention provides a four-arm spiral antenna, which is used for reducing the size of the four-arm spiral antenna and improving the performance of the four-arm spiral antenna.
The embodiment of the invention provides a four-arm helical antenna, which comprises the following components: a passive unit and an active unit;
the passive unit comprises a spiral arm for radiating or receiving electromagnetic waves;
the active unit comprises a first printed circuit board and a second printed circuit board; the first printed circuit board and the second printed circuit board are stacked at intervals; the feed port of the spiral arm is connected with the feed circuit of the first printed circuit board; the first printed circuit board is electrically connected with the second printed circuit board; the second printed circuit board is provided with an amplifying circuit and a connector, and the amplifying circuit is used for amplifying signals received from the first printed circuit board and outputting the signals through the connector.
The four-arm spiral antenna in the embodiment of the invention does not comprise a dielectric column, so that the weight of the antenna is greatly reduced, and the light weight of the antenna is effectively realized; in addition, through setting up first printed circuit board, second printed circuit board, increased the amplifier circuit in the second printed circuit board with the distance of passive unit, offset because antenna volume is little, the influence that the circuit board volume reduces the spiral arm back radiation that leads to produces the self-excitation phenomenon to guarantee that whole antenna can normally work.
A possible implementation manner, the passive unit further comprises a flexible printing medium plate, and the spiral arm is located on the surface of the flexible printing medium plate;
the bottom end and the top end of the flexible printing medium plate are respectively provided with a fixing part; the fixing member is for supporting the flexible print medium plate.
By arranging the fixing part, the problem that the flexible dielectric plate is easy to deform is solved.
A possible implementation manner, the quadrifilar helix antenna further comprises a radome;
the inner wall of the radome is in an axisymmetric shape, so that the central axis of the radome, the central axis of the inner wall of the radome and the central axis of the flexible dielectric plate are overlapped.
Through setting up to axisymmetric shape at the radome, just the central axis of radome with flexible dielectric plate central axis coincidence has solved the flexible dielectric plate and is difficult to fix at radome structure center, influences the problem of antenna performance.
One possible implementation manner, the top end of the inner wall of the radome is provided with a buckle, and the buckle is used for being fixedly connected with a fixing part of the top end.
Through the buckle for the antenna housing is fixed easily with the fixed part on the flexible dielectric board, and then realizes the fixed of flexible dielectric board to and guarantee that the flexible dielectric board is located the central axis direction of antenna housing, be favorable to fixing the flexible dielectric board at the structural center of antenna housing, thereby avoid four spiral arms to receive the frequency offset influence of antenna housing unevenly, guaranteed the receiving performance in each position of antenna.
In one possible implementation, the fixing member is an annular ring, and the annular ring is disposed in the inner ring of the flexible printed medium board.
One possible implementation manner is that a shielding cover is arranged between the second printed circuit board and the first printed circuit board;
the amplifying circuit is arranged on one surface of the second printed circuit board, which is close to the first printed circuit board; the amplifying circuit is positioned in the shielding cover;
the connector is arranged on one surface of the second printed circuit board away from the first printed circuit board.
By arranging the shielding cover, the interference of the amplifying circuit in the second printed circuit board and the spiral arm is further avoided, and the first printed circuit board and the second printed circuit board are effectively fixed.
In one possible implementation, the first printed circuit board and the second printed circuit board are electrically connected by a radio frequency cable, and the radio frequency cable is located in the shielding case.
One possible implementation is that the first printed circuit board and the second printed circuit board are circular; the shielding cover is cylindrical.
One possible implementation determines the location of the connection of the ground element of the spiral arm to the spiral arm based on the desired input impedance of the spiral arm.
One possible implementation manner is that the annular ring is made of glass fiber epoxy resin.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings that are needed in the description of the embodiments will be briefly described below, it will be apparent that the drawings in the following description are only some embodiments of the present invention, and that other drawings can be obtained according to these drawings without inventive effort for a person skilled in the art.
Fig. 1 is a schematic diagram of a quadrifilar helix antenna according to an embodiment of the present invention;
fig. 2 is a schematic diagram of a quadrifilar helix antenna according to an embodiment of the present invention;
fig. 3 is a schematic structural diagram of a quadrifilar helix antenna according to an embodiment of the present invention;
fig. 4 is a schematic diagram of a shielding case structure of a quadrifilar helix antenna according to an embodiment of the present invention;
fig. 5 is a schematic diagram of a radome structure of a quadrifilar helix antenna according to an embodiment of the present invention;
fig. 6 is a schematic diagram of a radome structure of a quadrifilar helix antenna according to an embodiment of the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention will be described in further detail below with reference to the accompanying drawings, and it is apparent that the described embodiments are only some embodiments of the present invention, not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
In the field of satellite navigation positioning, antennas are generally required to have good circular polarization characteristics to mitigate multipath interference from ionosphere, troposphere and terrestrial environments. The quadrifilar helix antenna has good axial ratio and a hemispherical covered heart-shaped gain pattern, and the gain is sharply attenuated at a pitching cut-off angle, so that the quadrifilar helix antenna is widely applied to the field of satellite navigation positioning.
As shown in fig. 1, the passive unit 100 of the antenna is composed of four wires, each of which is wound on a specific cylindrical surface or conical surface to form a spiral, and thus is called a spiral arm 110, and the pitches of adjacent spiral arms are equal. The length of the spiral arm 110 is approximately an integer multiple of λ/4, λ being the wavelength corresponding to the operating frequency of the antenna. The four spiral arms are fed with equal amplitude and have 90 DEG phase difference with the adjacent spiral arms, so that the antenna can radiate or receive circularly polarized electromagnetic waves.
For an active antenna receiving electromagnetic waves, a printed circuit board 130 with a feed circuit and an amplifying circuit is typically provided under the spiral arm 110. In order to meet the miniaturization requirement of satellite navigation positioning terminals, spiral antennas are becoming smaller and smaller, which also results in smaller and smaller circuit boards inside the antennas. Meanwhile, in order to ensure normal signal reception, the gain of the amplifying circuit is generally high, so that the printed circuit board 130 is easily affected by spiral back radiation, and a self-excitation phenomenon is generated, so that the antenna cannot normally receive signals.
To solve the above problems, as shown in fig. 2, an embodiment of the present application provides a quadrifilar helical antenna, including: a passive unit 200 and an active unit 201;
the passive unit 200 includes a spiral arm 210, and the spiral arm 210 is used to radiate or receive electromagnetic waves;
the active unit 201 includes a first printed circuit board 211 and a second printed circuit board 212; the first printed circuit board 211 and the second printed circuit board 212 are stacked at intervals; the feed port 230 of the spiral arm 210 is connected with the feed circuit of the first printed circuit board 211; the first printed circuit board 211 is electrically connected with the second printed circuit board 212; the second printed circuit board 212 is provided with an amplifying circuit for amplifying a signal received from the first printed circuit board 211 and outputting the amplified signal through the connector 241, and a connector 241.
By introducing two printed circuit boards 211-212, the feed circuit and the amplifying circuit are separated, so that the influence of spiral back radiation on the amplifying circuit is greatly weakened, the self-excitation is avoided, and the normal signal receiving of the antenna is ensured.
The surface of the first printed circuit board 211 is provided with a feed circuit, and the surface of the second printed circuit board 212 is provided with an amplifying circuit. The stacking manner of the first printed circuit board 211 and the second printed circuit board 212 may be a placement manner that the second printed circuit board 212 is located right below the first printed circuit board 211, or may be a staggered placement of the second printed circuit board 212 and the first printed circuit board 211 according to actual needs, so as to effectively avoid the influence of spiral back radiation on the second printed circuit board 212, and the distance between the second printed circuit board 212 and the first printed circuit board 211 may be set according to actual needs, and in a specific embodiment, the distance between the second printed circuit board 212 and the first printed circuit board 211 is at least 4 mm.
In one embodiment, two printed circuit boards 211-212 may be circular printed circuit boards as shown in fig. 2, with a diameter of 16.4mm and a thickness of 1.2mm, and the surface of the first printed circuit board 211 is provided with a feeding circuit with four feeding ports 230, and the bottom ends of the four spiral arms 210 are soldered to the four feeding ports 230, respectively.
In a particular implementation, the location of the connection of the ground element of the spiral arm 210 to the spiral arm 210 may be determined based on the desired input impedance of the spiral arm 210.
In the implementation process, four spiral arms 110 as shown in fig. 1 may be printed on a thin flexible dielectric sheet 120, and then the flexible dielectric sheet is rolled into a cylindrical surface or a conical surface, but the flexible dielectric sheet is easily deformed by slight collision, and the antenna performance is seriously affected after the deformation.
As shown in fig. 3, in one particular embodiment, the passive unit 200 further includes a flexible print media sheet on a surface of which the spiral arm 210 is located;
the bottom and top ends of the flexible printing medium plate are respectively provided with a fixing part 301; the fixing member 301 is for supporting the flexible print medium plate.
Wherein the flexible dielectric plate is soldered to the center of the upper surface of the first printed circuit board 211. The flexible dielectric sheet may be a cylinder having a diameter of 13mm and a height of 44mm, and is placed on the first printed circuit board 211.
The diameters of the first printed circuit board 211 and the second printed circuit board 212 are larger than those of the flexible dielectric sheet rolled into a cylindrical shape. The flexible dielectric sheet coincides with the central axes of the two printed circuit boards 211-212.
In a specific embodiment, the securing member 301 is an annular ring disposed in an inner race of the flexible print media sheet.
An annular ring is fixed at each end of the flexible dielectric sheet to better maintain the shape of the flexible dielectric sheet and withstand slight impact without deformation. The annular ring is flush with the top and bottom ends of the flexible dielectric sheet. In one embodiment, the annular ring may have an outer diameter of 13mm, an inner diameter of 11.6mm, and a thickness of 1mm, and may be disposed inside the flexible dielectric sheet, such that the outer diameter of the annular ring is equal to the diameter of the flexible dielectric sheet. The material of the annular ring can be glass fiber epoxy resin or other insulating materials, and is not limited herein.
In one possible implementation, the flexible dielectric sheet is rolled into a cylindrical surface, and the top and bottom ends of the cylindrical surface are each bonded with an annular ring, so that the flexible dielectric sheet can maintain the shape of the cylindrical surface after being slightly impacted.
Of course, an annular ring can be fixed on the inner side and the outer side of the flexible medium plate respectively, or an annular ring can be fixed on the outer side of the flexible medium plate, and the fixing mode is not limited, so that the flexible medium plate can better keep the shape.
The fixing member 301 may be other fixing means, for example, a cross support, etc., and may be determined according to the final shape of the flexible dielectric sheet, which is not limited herein.
To further reduce interference between the printed circuit boards 211-212 and the spiral arm 210, a metallic shield 401 is provided between the two printed circuit boards 211-212 as shown in fig. 4, in order to improve the signal performance of the antenna. The first printed circuit board 211 is electrically connected to the second printed circuit board 212 through a radio frequency cable, and specifically, an input end of the amplifying circuit is connected to an output end of the feeding circuit through a short and thin radio frequency cable. The radio frequency cable is located within the shield 401.
In a specific embodiment, a shield 401 is disposed between the second printed circuit board 212 and the first printed circuit board 211;
the amplifying circuit is arranged on one surface of the second printed circuit board 212 close to the first printed circuit board 211; the amplifying circuit is located in the shielding case 401;
the second printed circuit board 212 is provided with a connector 241 on a side thereof remote from the first printed circuit board 211.
Specifically, the second printed circuit board 212 may be located 4-8 mm below the first printed circuit board 211, and an amplifying circuit is disposed on the surface.
In order to meet the field work needs, the passive unit of the antenna can be fixed in the antenna housing, and the waterproof and dustproof functions are achieved. Radomes are generally cylindrical or conical in shape and are made of insulating material. For miniaturized helical antennas, the radome is only slightly larger in size than the rolled flexible dielectric sheet 120, so that the radome is very close to the helical arm 110 and has a large offset effect on the helical arm 110. In addition, existing radomes are typically simply cylindrical or conical, and cannot ensure that the flexible dielectric sheet 120 is secured in the center of the radome structure. If the flexible dielectric sheet 120 is offset from the central axis of the radome, the radome has different effects on the four spiral arms 110, thereby making the performance of the antenna non-uniform in various orientations.
As shown in fig. 5, in a specific embodiment, the quadrifilar helix antenna further comprises a radome 401;
the inner wall of the radome 401 is axisymmetric, so that the central axis of the radome 401, the central axis of the inner wall of the radome 401 and the central axis of the flexible dielectric plate coincide.
Specifically, the inner wall of the radome 401 may be in a shape of a cylinder, a truncated cone, or a cone, which is equiaxed and symmetrical. In a specific implementation, the fixing member 301 at the top end of the flexible dielectric plate may be fixed to the inner wall of the radome 401.
Through setting the inner wall of radome 401 to axisymmetric shape, guarantee that flexible dielectric plate is located the central axis direction of radome, be favorable to fixing the flexible dielectric plate at the structural center of radome 401 to avoid four spiral arms to receive the frequency offset influence of radome 401 unevenly, guaranteed the receiving performance in each position of antenna.
In a specific embodiment, the first printed circuit board 211 and the second printed circuit board 212 are circular; the shield 401 is cylindrical.
Of course, the first printed circuit board 211, the second printed circuit board 212 and the shield can 401 may have other shapes, and may be set as needed, which is not limited herein.
A cylindrical-shaped shield 401 having a diameter of 14mm is soldered between the two printed circuit boards 211-212, and the shield 401 is made of a metal having good electrical conductivity (such as copper foil). After the amplifying circuit is separated from the feeding circuit, the amplifying circuit on the second printed circuit board 212 keeps a certain distance from the spiral arm 210, so that the influence of spiral back radiation is greatly weakened, and self-excitation is avoided. The shield 401 functions to block external interference of the antenna side and to support the first printed circuit board 211. The lower surface of the second printed circuit board 212 is soldered with a connector 241, and the connector 241 is connected to the output end of the amplifying circuit, so as to provide the amplified radio frequency signal for the satellite navigation positioning terminal.
To reduce the process cost, the flexible dielectric plate is aligned with the axis of the radome 401, and the radome 401 may have a cylindrical shape. The inner wall of the radome 401 is in a truncated cone shape, and the caliber gradually narrows from the bottom to the top. The cylinder coincides with the central axis of the round table. The diameter of the bottom of the circular truncated cone is larger than the diameter of the printed circuit boards 211-212. The diameter of the top of the round table is smaller than the diameter of the printed circuit board. The antenna housing 401 has a bottom aperture of 17.3mm, a top aperture of 14mm and a height of 63.8mm. Radome 401 may be made of polycarbonate material and may have a cylindrical shape with a diameter of 18.8mm and a height of 67.5 mm.
The top end of the inner wall of the radome 401 is provided with a buckle 501, and the buckle 501 is used for being fixedly connected with the fixing part 301 at the top end of the flexible dielectric plate.
As shown in fig. 6, the buckles 501 are uniformly distributed on a circumference with a diameter slightly smaller than the inner diameter of the fixed part 301, and the center of the circumference is located on the central axis of the radome 401.
In a specific embodiment, 8 buckles 501 may be disposed on top of the inner wall of the radome 401, and the 8 buckles 501 are uniformly distributed on a circumference with a diameter of 11.5 mm, and the center of the circumference is located on the central axis of the radome 401.
By inserting the passive unit 200 and the active unit 201 into the antenna housing 401, the first printed circuit board 211 is clamped in the middle of the antenna housing 401, and is fastened with the annular ring fixed at the top end of the flexible medium plate from the inside by the buckle 501, so that the flexible medium plate is firmly installed in the center of the antenna housing 401 and is not easy to shake. The bore of radome 401 inner wall from the bottom to the top narrows gradually to set up buckle 501 at the inside top of radome 401, guarantee that flexible dielectric plate is located the central axis direction of radome, be favorable to fixing the structure center at the radome to flexible dielectric plate, thereby avoid four spiral arms to receive the frequency offset influence of radome unevenly, guaranteed the receiving performance in each position of antenna.
In the embodiment of the invention, the four-arm spiral antenna does not comprise a dielectric column, so that the weight of the antenna is greatly reduced, and the weight of the antenna is effectively reduced; in addition, through setting up first printed circuit board, second printed circuit board, increased the amplifier circuit in the second printed circuit board with the passive unit's of antenna distance, offset because antenna small, circuit board volume reduces the influence that leads to receiving spiral arm back radiation, produce the problem of self-excitation phenomenon to guarantee that whole antenna can normally work. Through setting up the shield cover, further avoided the interference of amplifying circuit and spiral arm in the second printed circuit board to through setting up fixed part, solved flexible dielectric plate and warp easily, and flexible dielectric plate is difficult to fix the problem at radome structure center, effectually improved antenna performance.
While preferred embodiments of the present invention have been described, additional variations and modifications in those embodiments may occur to those skilled in the art once they learn of the basic inventive concepts. It is therefore intended that the following claims be interpreted as including the preferred embodiments and all such alterations and modifications as fall within the scope of the invention.
It will be apparent to those skilled in the art that various modifications and variations can be made to the present invention without departing from the scope of the invention. Thus, it is intended that the present invention also include such modifications and alterations provided they come within the scope of the appended claims.
Claims (10)
1. A quadrifilar helical antenna comprising: a passive unit and an active unit;
the passive unit comprises a spiral arm for radiating or receiving electromagnetic waves;
the active unit comprises a first printed circuit board and a second printed circuit board; the first printed circuit board and the second printed circuit board are stacked at intervals; the feed port of the spiral arm is connected with the feed circuit of the first printed circuit board; the first printed circuit board is electrically connected with the second printed circuit board; the second printed circuit board is provided with an amplifying circuit and a connector, and the amplifying circuit is used for amplifying signals received from the first printed circuit board and outputting the signals through the connector; the first printed circuit board is used for separating a feed circuit and an amplifying circuit from the second printed circuit board.
2. The quadrifilar helix antenna according to claim 1 wherein the passive unit further comprises a flexible printed media sheet, the helix arm being located on a surface of the flexible printed media sheet;
the bottom end and the top end of the flexible printing medium plate are respectively provided with a fixing part; the fixing member is for supporting the flexible print medium plate.
3. The quadrifilar helix antenna of claim 2 wherein the quadrifilar helix antenna further comprises a radome;
the inner wall of the radome is in an axisymmetric shape, so that the central axis of the radome, the central axis of the inner wall of the radome and the central axis of the flexible printed medium plate are overlapped.
4. A quadrifilar helix antenna as claimed in claim 3 wherein the top end of the inner wall of the radome is provided with a catch for secure connection with a securing means for the top end.
5. The quadrifilar helix antenna of claim 2 wherein the securing means is an annular ring disposed in an inner race of the flexible printed media sheet.
6. The quadrifilar helix antenna of any one of claims 1 to 5 wherein a shield is provided between the second printed circuit board and the first printed circuit board;
the amplifying circuit is arranged on one surface of the second printed circuit board, which is close to the first printed circuit board; the amplifying circuit is positioned in the shielding cover;
the connector is arranged on one surface of the second printed circuit board away from the first printed circuit board.
7. The quadrifilar helix antenna according to claim 6 wherein,
the first printed circuit board is electrically connected with the second printed circuit board through a radio frequency cable, and the radio frequency cable is positioned in the shielding cover.
8. The quadrifilar helix antenna according to claim 6 wherein said first printed circuit board and said second printed circuit board are circular; the shielding cover is cylindrical.
9. The four-arm helical antenna of claim 6, wherein the location of the connection of the ground element of the helical arm to the helical arm is determined based on the desired input impedance of the helical arm.
10. The quadrifilar helix antenna according to claim 5 wherein the material of the annular ring is fiberglass epoxy.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810887450.5A CN109103587B (en) | 2018-08-06 | 2018-08-06 | Four-arm spiral antenna |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810887450.5A CN109103587B (en) | 2018-08-06 | 2018-08-06 | Four-arm spiral antenna |
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| Publication Number | Publication Date |
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| CN109103587A CN109103587A (en) | 2018-12-28 |
| CN109103587B true CN109103587B (en) | 2024-01-05 |
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| CN201810887450.5A Active CN109103587B (en) | 2018-08-06 | 2018-08-06 | Four-arm spiral antenna |
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| CN113067127B (en) * | 2021-03-12 | 2022-04-19 | 中国电子科技集团公司第二十九研究所 | Satellite-borne helical antenna feed structure and helical antenna |
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