CN113571911B - Miniaturized airborne ultrashort wave antenna - Google Patents
Miniaturized airborne ultrashort wave antenna Download PDFInfo
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- CN113571911B CN113571911B CN202110686594.6A CN202110686594A CN113571911B CN 113571911 B CN113571911 B CN 113571911B CN 202110686594 A CN202110686594 A CN 202110686594A CN 113571911 B CN113571911 B CN 113571911B
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- 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
- H01Q9/0407—Substantially flat resonant element parallel to ground plane, e.g. patch antenna
- H01Q9/045—Substantially flat resonant element parallel to ground plane, e.g. patch antenna with particular feeding means
- H01Q9/0457—Substantially flat resonant element parallel to ground plane, e.g. patch antenna with particular feeding means electromagnetically coupled to the feed line
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01Q—ANTENNAS, i.e. RADIO AERIALS
- H01Q1/00—Details of, or arrangements associated with, antennas
- H01Q1/002—Protection against seismic waves, thermal radiation or other disturbances, e.g. nuclear explosion; Arrangements for improving the power handling capability of an antenna
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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
- H01Q1/285—Aircraft wire antennas
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01Q—ANTENNAS, i.e. RADIO AERIALS
- H01Q1/00—Details of, or arrangements associated with, antennas
- H01Q1/48—Earthing means; Earth screens; Counterpoises
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01Q—ANTENNAS, i.e. RADIO AERIALS
- H01Q1/00—Details of, or arrangements associated with, antennas
- H01Q1/50—Structural association of antennas with earthing switches, lead-in devices or lightning protectors
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01Q—ANTENNAS, i.e. RADIO AERIALS
- H01Q5/00—Arrangements for simultaneous operation of antennas on two or more different wavebands, e.g. dual-band or multi-band arrangements
- H01Q5/10—Resonant antennas
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01Q—ANTENNAS, i.e. RADIO AERIALS
- H01Q5/00—Arrangements for simultaneous operation of antennas on two or more different wavebands, e.g. dual-band or multi-band arrangements
- H01Q5/20—Arrangements for simultaneous operation of antennas on two or more different wavebands, e.g. dual-band or multi-band arrangements characterised by the operating wavebands
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01Q—ANTENNAS, i.e. RADIO AERIALS
- H01Q5/00—Arrangements for simultaneous operation of antennas on two or more different wavebands, e.g. dual-band or multi-band arrangements
- H01Q5/50—Feeding or matching arrangements for broad-band or multi-band operation
Abstract
The invention discloses a miniaturized airborne ultrashort wave antenna, which comprises: the antenna comprises a base, a first dielectric plate, a plurality of first through holes, a second dielectric plate, a first branch section, a feed patch, a micro-strip feeder, a radiation patch, a micro-strip feeder floor, a second branch section and a grounding branch section; the first dielectric plate is fixedly connected with the base, and the back surface of the first dielectric plate is attached to the front surface of the second dielectric plate; the first branch, the feed patch, the microstrip feeder, the radiation patch, the microstrip feeder floor and the first through hole are all arranged on the first dielectric slab; the second branch and the grounding branch are arranged on the second dielectric slab. The invention can effectively widen the bandwidth of the antenna and improve the low-frequency gain. The airborne ultrashort wave antenna is simple and compact in structure and small in size.
Description
Technical Field
The invention belongs to the technical field of ultrashort wave antennas, and particularly relates to a miniaturized airborne ultrashort wave antenna.
Background
The ultra-short wave communication is used in a wide area, and a user wants to keep a communication speech path smooth and secret. However, they often suffer from problems of eavesdropping, electronic countermeasure, channel congestion and the like, and the conventional short-wave radio station transmits and receives at a fixed frequency and cannot avoid eavesdropping, man-made interference and channel blockage. These problems must be overcome completely by using frequency hopping techniques.
Frequency hopping is a common military anti-interference communication method. Compared with fixed frequency communication, frequency hopping communication is more concealed and is difficult to intercept. As long as the opposite side does not know the carrier frequency hopping rule, the communication content of the opposite side is difficult to intercept. The frequency hopping communication has two functions, one is to improve fading, and the other is to adopt frequency hopping technology to greatly improve the communication quality of the mobile station in the multipath environment, which is equivalent to frequency diversity. The antenna is used as an important component of a wireless communication system, and the broadening of the working bandwidth of the antenna can effectively improve the function of a frequency hopping technology in wireless communication.
The ultra-short wave antenna is usually designed by adopting a line antenna, and the line antenna has the characteristics of stable performance, simple structure, easiness in processing, low cost and the like, and is widely applied to practical engineering. For the current airborne ultrashort wave antenna, the index requirements such as gain, a directional diagram, standing-wave ratio and the like are met in a frequency band based on the conformality, and the design period and the cost are greatly improved.
Lumped network loading is a common means for size miniaturization of short-wave and ultra-short-wave antennas, and the lumped network comprises reactance elements, lumped elements and the like. The loading of the resistor can effectively improve the low-frequency impedance and improve the working bandwidth of the antenna, but the radiation efficiency of the antenna is reduced, so that the gain is reduced. As is known, the 506-3 type airborne ultrashort wave antenna has a wider working bandwidth after being loaded by a resistor, but the gain is very low, and the low-frequency gain is only-9 dBi.
Disclosure of Invention
In order to solve the problems in the prior art, the invention provides a miniaturized airborne ultrashort wave antenna. The technical problem to be solved by the invention is realized by the following technical scheme:
a miniaturized airborne ultrashort wave antenna comprising: the antenna comprises a base, a first dielectric plate, a plurality of first through holes, a second dielectric plate, a first branch, a feed patch, a micro-strip feeder line, a radiation patch, a micro-strip feeder line floor, a second branch and a grounding branch;
the bottom end of the first dielectric plate is fixedly connected with the base, and the back surface of the first dielectric plate is attached to the front surface of the second dielectric plate and is concentric and coaxial with the second dielectric plate; the airborne ultrashort wave antenna takes a central vertical axis of the first dielectric plate as an axisymmetric structure;
the first branch knot is arranged on the upper part of the front surface of the first dielectric plate and connected with the top end of the feed patch;
the feed patch is arranged on the front surface of the first dielectric plate, and the bottom end of the feed patch is connected with the top end of the microstrip feed line;
the microstrip feeder line is arranged on the front surface of the first dielectric plate, and the bottom end of the microstrip feeder line is connected with the feed port;
the radiation patch is arranged on the back surface of the first dielectric slab, the top end of the radiation patch is connected with the top end of the first dielectric slab, and the bottom end of the radiation patch is provided with a notch;
the microstrip feeder line floor is arranged on the back surface of the first dielectric slab, is close to the notch, has a gap with the notch, and is connected with the base at the bottom end;
the hole wall of the first through hole is plated with metal, and two ends of the first through hole are communicated with the first branch knot and the top end of the radiation patch;
the bottom end of the second dielectric plate is fixedly connected with the base;
the second branch section is arranged at the upper part of the back surface of the second dielectric plate, and the bottom end of the second branch section is connected with the top end of the grounding branch section;
the grounding branch knot is arranged on the back face of the second dielectric plate, and the bottom end of the grounding branch knot is connected with the base.
In one embodiment of the present invention, the first branch is near the top end of the first dielectric plate.
In an embodiment of the present invention, the second branch is an axisymmetric pattern about a central vertical axis of the second dielectric plate.
In one embodiment of the present invention, the second branch comprises: the first transverse section, the two first vertical sections, the two second transverse sections and the two second vertical sections;
the two ends of the first transverse section are respectively connected with the bottom end of a first vertical section, the top end of the first vertical section is connected with one end of the second transverse section, and the other end of the second transverse section is connected with the second vertical section;
the first transverse section and the first vertical section, the first vertical section and the second transverse section and the second vertical section are vertical to each other;
the two second vertical sections are arranged at intervals, and the bottom ends of the second vertical sections are arranged at intervals with the first transverse sections.
In one embodiment of the present invention, the number of the first through holes is four; and are distributed axisymmetrically with respect to said central vertical axis.
In an embodiment of the present invention, the ground branch is an elongated strip and is located on the central vertical axis of the second dielectric plate.
In one embodiment of the present invention, the upper portion of the feeding patch becomes gradually wider from the top downward; the lower part of the feed patch is gradually narrowed from the connection part with the upper part downwards, and two sides of the lower part of the feed patch are intersected at the bottom end of the feed patch;
two sides of the upper part and two sides of the lower part of the feed patch are linear.
In one embodiment of the present invention, the notch is a rectangular notch structure, and the notch is axisymmetrical with respect to a central vertical axis of the first dielectric plate.
In one embodiment of the present invention, the top edge and the side edge of the radiation patch coincide with the top edge and the corresponding side edge of the first dielectric plate;
the side edge and the bottom edge of the microstrip feeder line floor are overlapped with the corresponding side edge and bottom edge of the first dielectric plate;
and the top end edge and the side edge of the second branch section are overlapped with the top end edge and the corresponding side edge of the second dielectric slab.
In an embodiment of the present invention, the maximum length of each of the first dielectric plate and the second dielectric plate is 0.30 λ to 0.31 λ, where λ is a wavelength corresponding to the center frequency.
The invention has the beneficial effects that:
1. the first through hole on the first dielectric plate can be equivalent to an inductor, a plurality of inductors are equivalent to an inductor with smaller reactance in parallel connection, a gap between the radiation patch and the microstrip feeder floor can be equivalent to a capacitor, the inductor and the capacitor are connected in series and in parallel, electromagnetic coupling is generated on a feed structure, the generated band-pass characteristic improves the electrical property of the antenna, the bandwidth of the antenna is effectively widened, and the frequency band of 0.425f-1.57f (f is central frequency) is covered. The first branch and the second branch prolong the current path of the antenna, and the high-low frequency impedance is adjusted through the grounding branch, so that the antenna still has good standing wave and radiation characteristics in a low-frequency band, and the lowest-frequency gain reaches-5 dBi.
2. The airborne ultrashort wave antenna is simple and compact in structure and small in size.
The present invention will be described in further detail with reference to the accompanying drawings and examples.
Drawings
Fig. 1 is a schematic structural diagram of a miniaturized airborne ultrashort wave antenna provided by an embodiment of the present invention.
Description of the reference numerals:
10-a base; 11-a metal disc; 12-a fixation bar; 20-a first dielectric slab; 21-a first via; 22-first branch; 23-a feed patch; 24-a microstrip feed line; 25-a radiation patch; 26-microstrip feeder floor; 27-gap; 30-a second dielectric slab; 40-second branch; 41-a first transverse section; 42-a first vertical section; 43-a second transverse section; 44-a second vertical section; 50-grounded branch.
Detailed Description
The present invention will be described in further detail with reference to specific examples, but the embodiments of the present invention are not limited thereto.
Example one
Referring to fig. 1, a miniaturized airborne ultrashort wave antenna includes: the antenna comprises a base 10, a first dielectric plate 20, a plurality of first through holes 21, a second dielectric plate 30, a first branch 22, a feed patch 23, a microstrip feeder 24, a radiation patch 25, a microstrip feeder floor 26, a second branch 40 and a grounding branch 50. The bottom end of the first dielectric plate 20 is fixedly connected with the base 10, the back surface of the first dielectric plate 20 is attached to the front surface of the second dielectric plate 30, and the first dielectric plate 20 and the second dielectric plate 30 are concentric and coaxial. The airborne ultrashort wave antenna takes the central vertical axis of the first dielectric plate 20 as an axisymmetric structure. The whole airborne ultrashort wave antenna is of a symmetrical structure. Specifically, the radiation patch 25 and the microstrip feeder floor 26 are located on the back surface of the first dielectric plate 20, and between the back surface of the first dielectric plate 20 and the front surface of the second dielectric plate 30.
The first branch 22 is disposed on the upper portion of the front surface of the first dielectric plate 20, and the first branch 22 is connected to the top end of the feed patch 23. In particular, the center of the first stub 22 is in the feed patch 23 connection. The feed patch 23 is disposed on the front surface of the first dielectric plate 20, and the bottom end of the feed patch 23 is connected to the top end of the microstrip feed line 24. The microstrip feed line 24 is disposed on the front surface of the first dielectric plate 20, and the bottom end of the microstrip feed line 24 is connected to the feed port. The radiation patch 25 is arranged on the back of the first dielectric slab 20, the top end of the radiation patch 25 is connected with the top end of the first dielectric slab 20, and the bottom end of the radiation patch 25 is provided with a notch. The microstrip feeder floor 26 is arranged on the back of the first dielectric plate 20, the microstrip feeder floor 26 is close to the notch, a gap 27 is formed between the microstrip feeder floor 26 and the notch, and the bottom end of the microstrip feeder floor 26 is connected with the base 10. The hole wall of the first through hole 21 is plated with metal, and two ends of the first through hole 21 are communicated with the top ends of the first branch 22 and the radiation patch 25. In this embodiment, the first through hole 21 penetrates the first branch 22, the first dielectric plate 20, and the first radiation patch 25.
In this embodiment, the first through hole 21 on the first dielectric plate 20 may be equivalent to an inductor, a plurality of inductors are equivalent to an inductor with smaller reactance in parallel, the gap 27 between the radiation patch 25 and the microstrip feeder line floor 26 may be equivalent to a capacitor, and the inductors and the capacitors are connected in series and parallel, so as to generate electromagnetic coupling on the feed structure, and the generated bandpass characteristic improves the electrical performance of the antenna, effectively broadens the bandwidth of the antenna, and covers the frequency band of 0.425f to 1.57f (f is the center frequency).
The bottom end of the second dielectric plate 30 is fixedly connected with the base 10. The second branch 40 is disposed on the upper portion of the back surface of the second dielectric plate 30, and the bottom end of the second branch 40 is connected to the top end of the grounding branch 50. The grounding branch 50 is disposed on the back of the second dielectric plate 30, and the bottom end of the grounding branch 50 is connected to the base 10. In this embodiment, the first branch 22 and the second branch 40 extend the current path of the antenna, and the grounding branch 50 adjusts the high-low frequency impedance, improves the high-low frequency impedance characteristics, and increases the average gain of the antenna; the antenna still has good standing wave and radiation characteristics in a low frequency band, and the lowest frequency gain reaches-5 dBi.
Of course, the first dielectric plate 20 and the second dielectric plate 30 may take any shape, and preferably, the first dielectric plate 20 and the second dielectric plate 30 are rectangular, the area of the first dielectric plate 20 is smaller than that of the second dielectric plate 30, the lengths of the first dielectric plate 20 and the second dielectric plate 30 are the same, and all the structures on the dielectric plates are printed on the dielectric plates. The first dielectric sheet 20 is made of FR4 plate material, and its length, width and thickness are 365mm x 140mm x 2mm respectively. The second dielectric sheet 30 is made of FR4 plate material, and has length, width and thickness of 365mm x 180mm x 1 mm. The base 10 is made of aluminum material, and the length, width and height of the base are respectively 200mm x 85mm x 17 mm. Except the base 10, the length, width and thickness of the airborne ultrashort wave antenna are only 365mm 180mm 3mm, and the radiation structure metal part of the airborne ultrashort wave antenna is printed on the dielectric plate, so that the airborne ultrashort wave antenna is small in size, small in size and light in weight, is easy to conform to the wing of an airplane, saves space and is convenient to install. Meanwhile, the first dielectric plate 20 and the second dielectric plate 30 are connected with the base 10 by screw threads, so that the assembly and maintenance are further facilitated.
In a possible implementation manner, the maximum length of each of the first dielectric plate 20 and the second dielectric plate 30 is 0.30 λ -0.31 λ, where λ is a wavelength corresponding to the center frequency.
Preferably, the maximum length of each of the first dielectric sheet 20 and the second dielectric sheet 30 is 0.304 λ, that is, 365 mm.
It should be noted that the invention does not need to adopt lumped network loading to realize that the working frequency band of the ultrashort wave antenna is improved, and simultaneously, the low-frequency gain is also improved, the miniaturization is realized in the structure, and the radiation performance of horizontal omnidirectional high gain is realized under the condition of no lumped network loading.
In a possible implementation manner, each structure may be in an axisymmetric shape taking a central vertical axis of the dielectric slab as a symmetry axis, and the shape of the notch of the microstrip feeder floor 26 may be in any axisymmetric shape, including but not limited to an inverted U shape, a rectangular shape, an inverted V shape, an arc shape, and the like. The microstrip feed line 24 is located on the central vertical axis of the first dielectric slab 20.
In a feasible implementation mode, the design idea of the invention can be embodied by replacing the printed patch on the dielectric plate with a metal sheet instead of the dielectric plate.
Further, as shown in fig. 1, the first branch 22 is close to the top end of the first dielectric plate 20. The first branch 22 is a strip, and the first branch 22 is perpendicular to the longitudinal axis of the ultrashort wave antenna.
Preferably, the length of the first branch 22 is smaller than the width of the first dielectric plate 20, the first branch 22 is axisymmetrical with respect to the central vertical axis of the first dielectric plate 20, and the middle portion of the first branch 22 is connected with the top end of the feed patch 23.
Further, the number and radius of the first through holes 21 may be adjusted according to the resonance frequency.
Preferably, as shown in fig. 1, the number of the first through holes 21 is four. Two of the first through holes 21 are located on one side of the central vertical axis of the first dielectric plate 20, the other two first through holes 21 are located on the other side of the central vertical axis of the first dielectric plate 20, and the four first through holes 21 are axially symmetrically distributed about the central vertical axis.
Further, as shown in fig. 1, the upper portion of the feed patch 23 is gradually widened from the top downward. The lower portion of the feed patch 23 is tapered downward from the connection with the upper portion, and both sides of the lower portion of the feed patch 23 meet at the bottom end of the feed patch 23. Both sides of the upper portion and both sides of the lower portion of the feed patch 23 are linear. In this embodiment, the gradual change structure of the feed patch 23 has a good impedance matching effect in a wide frequency band, and improves the impedance characteristics.
In one possible implementation, the two sides of the upper portion of the feed patch 23 are longer in length and the two sides of the lower portion are shorter in length. The feed patch 23 may be a rectangular patch that is subjected to corner cutting, and four triangular corner cuts are cut from the rectangular patch, wherein two corner cuts located at two sides of the bottom end of the feed patch 23 are smaller, and two corner cuts located at two sides of the top end of the feed patch 23 are larger. The feeding patch 23 is located within an area corresponding to the radiating patch 25.
Further, the microstrip feed line 24 is located at the central vertical axis of the first dielectric plate 20 and extends vertically, and the microstrip feed line 24 is in a linear shape.
Further, as shown in fig. 1, the top edge of the radiation patch 25 and the side edge of the radiation patch 25 coincide with the top edge and the corresponding side edge of the first dielectric sheet 20. In this embodiment, three edges of the radiation patch 25 coincide with three edges of the first dielectric sheet 20. The gap is a rectangular gap structure, and the gap is axisymmetrical with respect to the central vertical axis of the first dielectric plate 20. In this embodiment, the notch is a rectangular notch formed at the bottom end of the rectangular radiation patch 25.
Further, as shown in fig. 1, the side edges and the bottom edges of the microstrip feed line lands 26 coincide with the corresponding side edges and bottom edges of the first dielectric plate 20. In this embodiment, the shape of the microstrip feed line ground 26 matches the shape of the notch of the radiation patch 25. Specifically, the microstrip feed line floor 26 is in a shape of a letter "convex", and gaps 27 are formed between the microstrip feed line floor 26 and the notch and between the bottom ends of the radiation patches 25.
Further, as shown in fig. 1, the second branch 40 is an axisymmetric pattern about the central vertical axis of the second dielectric sheet 30. Specifically, the corresponding position of the bottom end of the second branch 40 passes through the upper portion of the feed patch 23.
Further, as shown in fig. 1, the second branch 40 includes: a first transverse section 41, two first vertical sections 42, two second transverse sections 43 and two second vertical sections 44. The two ends of the first horizontal section 41 are respectively connected with the bottom end of a first vertical section 42, the top end of the first vertical section 42 is connected with one end of a second horizontal section 43, and the other end of the second horizontal section 43 is connected with a second vertical section 44.
The first transverse segment 41 and the first vertical segment 42, the first vertical segment 42 and the second transverse segment 43, and the second transverse segment 43 and the second vertical segment 44 are perpendicular to each other. Two second vertical sections 44 are arranged at intervals, and the bottom end of the second vertical section 44 is arranged at intervals with the first transverse section 41. Two second vertical sections 44 are spaced apart, and the bottom end of the second vertical section 44 is spaced apart from the first transverse section 41.
In this embodiment, the second branches 40 are spaced apart from each other to form a "mountain" shape, and accordingly, the second branches 40 may also be understood as an axisymmetric double-inverted G-shaped structure.
In a feasible implementation manner, the second branch 40 may also be obtained by bending a branch with a certain width from the center to both ends for 3 times along one direction, the bending angle is 90 ° each time, and the width of each section of the bent branch is not equal to each other, that is, the widths of the first transverse section 41, the first vertical section 42, the second transverse section 43, and the second vertical section 44 are not equal to each other. The width of each section of the second branch 40 can be adjusted according to actual needs.
Further, as shown in fig. 1, the top edge and the side edge of the second branch 40 coincide with the top edge and the corresponding side edge of the second dielectric sheet 30. Specifically, the top edge of the second transverse section 43 coincides with the top edge of the second dielectric sheet 30, and the outer side edge of the first vertical section 42 coincides with the outer side edge of the second dielectric sheet 30.
Further, as shown in fig. 1, the grounding branch 50 is a long strip, and the grounding branch 50 is located on the central vertical axis of the second dielectric plate 30 and extends vertically. In this embodiment, the top end of the ground branch 50 is connected to the midpoint of the bottom end of the first transverse segment 41.
Further, as shown in fig. 1, the base 10 includes: a metal disc 11 and a fixing strip 12. The fixing strip 12 is fixed on the metal disc 11 and located on the back of the second dielectric slab 30, and the fixing strip 12 is fixedly connected with the second dielectric slab 30 and the first dielectric slab 20.
In a feasible implementation manner, six connection holes are formed in the fixing bar 12, six second through holes are correspondingly formed in the second dielectric plate 30 near the bottom end, four third through holes are correspondingly formed in the first dielectric plate 20 near the bottom end, and the third through holes penetrate through the microstrip feeder floor 26. The connecting hole is fixedly connected with the second through hole and the third through hole through screws or bolts and nuts. In this embodiment, the base 10 and the dielectric plate are fixedly connected by a screw thread connection, and are easy to detach.
In the description of the present invention, it is to be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", and the like, indicate orientations and positional relationships based on those shown in the drawings, and are used only for convenience of description and simplicity of description, and do not indicate or imply that the device or element being referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus, should not be considered as limiting the present invention.
Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of the present invention, "a plurality" means two or more unless specifically defined otherwise.
In the present invention, unless otherwise explicitly stated or limited, the terms "mounted," "connected," "fixed," and the like are to be construed broadly, e.g., as being permanently connected, detachably connected, or integral; can be mechanically or electrically connected; either directly or indirectly through intervening media, either internally or in any other relationship. The specific meanings of the above terms in the present invention can be understood by those skilled in the art according to specific situations.
In the present invention, unless otherwise expressly stated or limited, "above" or "below" a first feature means that the first and second features are in direct contact, or that the first and second features are not in direct contact but are in contact with each other via another feature therebetween. Also, the first feature "on," "above" and "over" the second feature may include the first feature being directly above and obliquely above the second feature, or simply indicating that the first feature is at a higher level than the second feature. A first feature being "under," "below," and "beneath" a second feature includes the first feature being directly under and obliquely below the second feature, or simply meaning that the first feature is at a lesser elevation than the second feature.
In the description herein, references to the description of the term "one embodiment," "some embodiments," "an example," "a specific example," or "some examples," etc., mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the invention. In this specification, the schematic representations of the terms used above are not necessarily intended to refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples. Furthermore, various embodiments or examples described in this specification can be combined and combined by those skilled in the art.
The foregoing is a more detailed description of the invention in connection with specific preferred embodiments and it is not intended that the invention be limited to these specific details. For those skilled in the art to which the invention pertains, several simple deductions or substitutions can be made without departing from the spirit of the invention, and all shall be considered as belonging to the protection scope of the invention.
Claims (7)
1. A miniaturized airborne ultrashort wave antenna, comprising: the antenna comprises a base (10), a first dielectric plate (20), a plurality of first through holes (21), a second dielectric plate (30), a first branch (22), a feed patch (23), a microstrip feed line (24), a radiation patch (25), a microstrip feed line floor (26), a second branch (40) and a grounding branch (50);
the bottom end of the first dielectric plate (20) is fixedly connected with the base (10), the back surface of the first dielectric plate is attached to the front surface of the second dielectric plate (30), and the first dielectric plate and the second dielectric plate (30) are concentric and coaxial; the airborne ultrashort wave antenna takes a central vertical axis of the first dielectric plate (20) as an axisymmetric structure;
the first branch (22) is arranged at the upper part of the front surface of the first dielectric plate (20) and is connected with the top end of the feed patch (23);
the feed patch (23) is arranged on the front surface of the first dielectric plate (20), and the bottom end of the feed patch is connected with the top end of the microstrip feed line (24);
the microstrip feeder line (24) is arranged on the front surface of the first dielectric plate (20), and the bottom end of the microstrip feeder line is connected with the feed port;
the radiation patch (25) is arranged on the back surface of the first dielectric slab (20), the top end of the radiation patch is connected with the top end of the first dielectric slab (20), and a notch is formed in the bottom end of the radiation patch;
the microstrip feeder line floor (26) is arranged on the back surface of the first dielectric slab (20), is close to the notch, has a gap (27) with the notch, and is connected with the base (10) at the bottom end;
the wall of the first through hole (21) is plated with metal, and two ends of the first through hole are communicated with the first branch (22) and the top end of the radiation patch (25);
the bottom end of the second medium plate (30) is fixedly connected with the base (10);
the second branch section (40) is arranged at the upper part of the back surface of the second dielectric slab (30), and the bottom end of the second branch section is connected with the top end of the grounding branch section (50);
the grounding branch knot (50) is arranged on the back surface of the second dielectric plate (30), and the bottom end of the grounding branch knot is connected with the base (10);
the first branch (22) is close to the top end of the first medium plate (20);
the second branch (40) is an axisymmetric figure about the central vertical axis of the second dielectric slab (30);
the second branch (40) comprises: a first transverse section (41), two first vertical sections (42), two second transverse sections (43) and two second vertical sections (44);
two ends of the first transverse section (41) are respectively connected with the bottom end of a first vertical section (42), the top end of the first vertical section (42) is connected with one end of the second transverse section (43), and the other end of the second transverse section (43) is connected with the second vertical section (44);
the first transverse section (41) and the first vertical section (42), the first vertical section (42) and the second transverse section (43), and the second transverse section (43) and the second vertical section (44) are perpendicular to each other;
the two second vertical sections (44) are arranged at intervals, and the bottom ends of the second vertical sections (44) and the first transverse section (41) are arranged at intervals;
the side edge and the bottom edge of the microstrip feeder floor (26) are overlapped with the corresponding side edge and bottom edge of the first dielectric plate (20).
2. A miniaturized airborne ultrashort wave antenna according to claim 1, wherein the number of the first through holes (21) is four; and are distributed axisymmetrically with respect to said central vertical axis.
3. A miniaturized airborne ultrashort wave antenna according to claim 2 wherein the grounding stub (50) is elongated and located on the central vertical axis of the second dielectric plate (30).
4. A miniaturized airborne ultrashort wave antenna according to claim 3, wherein the upper part of the feed patch (23) is gradually widened from the top downwards; the lower part of the feed patch (23) is gradually narrowed from the connection part with the upper part downwards, and two sides of the lower part of the feed patch (23) are intersected at the bottom end of the feed patch (23);
two sides of the upper part and two sides of the lower part of the feed patch (23) are linear.
5. A miniaturized airborne ultrashort wave antenna according to claim 4, wherein the notch is a rectangular notch structure, and the notch is axisymmetrical with respect to a central vertical axis of the first dielectric plate (20).
6. A miniaturized airborne ultrashort wave antenna according to claim 5, wherein the top and side edges of the radiating patch (25) coincide with the top and corresponding side edges of the first dielectric plate (20);
the top edge and the side edge of the second branch section (40) are overlapped with the top edge and the corresponding side edge of the second medium plate (30).
7. The miniaturized airborne ultrashort wave antenna of claim 1, wherein the maximum length of the first dielectric plate (20) and the maximum length of the second dielectric plate (30) are both 0.30 λ -0.31 λ, and λ is a wavelength corresponding to a center frequency.
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| US6809687B2 (en) * | 2001-10-24 | 2004-10-26 | Alps Electric Co., Ltd. | Monopole antenna that can easily be reduced in height dimension |
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| CN205811043U (en) * | 2016-07-06 | 2016-12-14 | 吉林医药学院 | A kind of M shape three band Planer printed monopole antenna |
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