CN115084872A - Ultra-wide bandwidth scanning angle tightly-coupled phased array antenna - Google Patents
Ultra-wide bandwidth scanning angle tightly-coupled phased array antenna Download PDFInfo
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- CN115084872A CN115084872A CN202210783911.0A CN202210783911A CN115084872A CN 115084872 A CN115084872 A CN 115084872A CN 202210783911 A CN202210783911 A CN 202210783911A CN 115084872 A CN115084872 A CN 115084872A
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01Q—ANTENNAS, i.e. RADIO AERIALS
- H01Q21/00—Antenna arrays or systems
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01Q—ANTENNAS, i.e. RADIO AERIALS
- H01Q1/00—Details of, or arrangements associated with, antennas
- H01Q1/12—Supports; Mounting means
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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
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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
- H01Q1/48—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
- H01Q13/00—Waveguide horns or mouths; Slot antennas; Leaky-waveguide antennas; Equivalent structures causing radiation along the transmission path of a guided wave
- H01Q13/08—Radiating ends of two-conductor microwave transmission lines, e.g. of coaxial lines, of microstrip lines
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01Q—ANTENNAS, i.e. RADIO AERIALS
- H01Q15/00—Devices for reflection, refraction, diffraction or polarisation of waves radiated from an antenna, e.g. quasi-optical devices
- H01Q15/0006—Devices acting selectively as reflecting surface, as diffracting or as refracting device, e.g. frequency filtering or angular spatial filtering devices
- H01Q15/0013—Devices acting selectively as reflecting surface, as diffracting or as refracting device, e.g. frequency filtering or angular spatial filtering devices said selective devices working as frequency-selective reflecting surfaces, e.g. FSS, dichroic plates, surfaces being partly transmissive and reflective
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- Y02D—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN INFORMATION AND COMMUNICATION TECHNOLOGIES [ICT], I.E. INFORMATION AND COMMUNICATION TECHNOLOGIES AIMING AT THE REDUCTION OF THEIR OWN ENERGY USE
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Abstract
The invention provides an ultra-wide bandwidth scanning angle tightly-coupled phased array antenna, which comprises a dielectric substrate; the dipole radiation unit, the exponential gradient balun feed structure and the frequency selection surface structure are printed on the dielectric substrate; the metal grounding plate is arranged below the dipole radiation unit and is vertically connected with the dielectric substrate; the dipole radiation unit comprises a first dipole radiation patch and a second dipole radiation patch which are distributed on two sides of the dielectric substrate, the exponential gradient balun feed structure is arranged below the dipole radiation unit, and the frequency selection surface structure is arranged above the dipole radiation unit; the ultra-wide bandwidth scanning angle tightly-coupled phased array antenna provided by the invention replaces the traditional medium matching layer with the frequency selection surface structure, so that the weight of the array is reduced to a great extent.
Description
Technical Field
The invention belongs to the technical field of antennas, and particularly relates to an ultra-wide bandwidth scanning angle tightly-coupled phased array antenna.
Background
The phased array antenna is also called an electric scanning antenna, has the advantages of high scanning speed and high stability, and can realize beam forming and multi-beam scanning. Phased array technology has therefore found widespread use in recent years with radar and communication systems in airborne and space applications. In the current research field of phased arrays, ultra-wideband, especially phased array antenna designs that can cover multiple operating frequency bands, are becoming an important trend. In particular, in order to cope with the battlefield environment of the increasingly complex modern war, military equipment platforms, such as ships and airplanes, need to be equipped with, in addition to the traditional detection radar, various communication and navigation devices, such as weather radar, electronic countermeasure systems and the like. If the narrow-band antennas with different frequency bands are adopted to meet the requirement of various systems for receiving and transmitting information, the number of antennas required on the platform is increased rapidly. Besides occupying a large amount of space, a plurality of radio systems also increase the radar scattering cross section of the ship and bring difficulty to system maintenance. The working frequency band of the ultra-wideband phased array antenna can cover a plurality of octaves, so that the single array can be used for transmitting and receiving broadband or discrete signals, the multifunctional common aperture can be realized, and the integration cost between the antenna and a system is saved. In addition, the ultra-wideband phased array antenna can also improve the capacity and the speed of data transmission, realize a communication system for high-speed data transmission and improve the radar imaging resolution.
The traditional ultra-wideband phased array antenna is often provided with a higher profile, for example, Vivaldi array can reach 12 octaves of impedance bandwidth, but 2-3 times lambda of impedance bandwidth high (λ high The wavelength corresponding to the highest operating frequency) limits their use in some carrier platforms where aerodynamic requirements are high. Furthermore, the high profile means that the longitudinal currents along the slot lines will be large, causing crossovers during antenna scanningThe rise of the polarization component. Especially when scanning in the diagonal plane, cross polarization components are often observed to be even larger than main polarization components, which seriously affects the stealth performance.
Munk and Harris corporation of America in 2003 disclose a model 28 x 28 dual polarized array working at 2-18GHz and developed by cooperation with them, and the structural section of the model above the floor is only lambda low /10(λ low Is the lowest operating frequency). Different from the design of a traditional phased array antenna, the antenna is closely arranged in dipole units, and the inductance of the floor caused by low frequency is counteracted through the coupling capacitance among array elements, so that the impedance bandwidth of multiple frequency ranges is realized. The operating bandwidth of the antenna array can be much larger than the operating bandwidth of a single dipole. Such antennas are commonly referred to as tightly coupled phased array antennas. In the first generation of tightly coupled antenna prototype, the feed network used an external balun, a double-cylinder axis and a grounded shield. The external balun can generate differential output signals, and the grounding shielding device can protect and fix the feeder line and can also play a role in avoiding common-mode resonance through the double-coaxial-line feed dipole radiation arms. However, the external feeding structure has the disadvantages of high price, large volume and heavy weight, and is not beneficial to engineering application. To address this issue, the Volakis team proposed the concept of integrated balun (light coupled diode array with integrated balun) in 2012. The design uses a planarized Marchand balun and is integrated with the dipole element into one circuit board. In order to reduce the difficulty of impedance matching from a coaxial line to the aperture of an antenna, in the design, an array unit is divided into two parts, the radiation impedance of the aperture surface is halved, meanwhile, a Wilkinson power divider (Wilkinson power divider) is used for converting the input impedance of 50 omega at the same shaft end into 100 omega, and then Marchand balun is used for completing the conversion from unbalance to balance. Since the antenna and the feeding network are printed on the same dielectric board, the Array is called a Tightly Coupled Dipole Array (TCDA-IB) of Integrated Balun. Finally, the antenna array can realize +/-45-degree scanning angle coverage within a frequency band of 0.68-5 GHz. The team subsequently proposed the tightening of the loading resistance rings and resistance discsThe antenna array is coupled, and a resistor disc is loaded between the dipole and the floor to eliminate short circuit. The array was verified to achieve an impedance bandwidth of 13.3:1 (Active VSWR < 3.0) with a beam sweep range of + -45 deg.. But the efficiency of the antenna is influenced to a certain extent due to the loading of the resistor sheet, and the section of the antenna reaches 1.1 lambda high And is not beneficial to the practical application of engineering. In order to further reduce the profile of the tightly coupled array, Kasemodel proposed a design in which no cladding is used, but a high permeability ferrite material is filled between the antenna and the floor. Reducing the profile height of the antenna to λ low The radiation efficiency of the array will thus be greatly reduced 26. Moreover, ferrite materials are expensive to manufacture and heavy, and are hardly practical.
In summary, the traditional ultra-wideband antenna has the problems of high profile and poor polarization purity. The novel tightly coupled antenna array can realize ultra-wideband scanning under the condition of a lower profile, but also faces the difficulty of feed network design and the problem of antenna efficiency.
Disclosure of Invention
The invention aims to provide an ultra-wide bandwidth scanning angle tightly-coupled phased array antenna which is light in weight, high in antenna efficiency, high in isolation, low in profile and low in cross polarization.
In order to achieve the above object, a technical solution of the present invention is as follows, an ultra wide bandwidth scanning angle tightly coupled phased array antenna, comprising:
a dielectric substrate;
the dipole radiation unit, the exponential gradient balun feed structure and the frequency selection surface structure are printed on the dielectric substrate;
the metal grounding plate is arranged below the dipole radiation unit and is vertically connected with the dielectric substrate;
the dipole radiation unit comprises a first dipole radiation patch and a second dipole radiation patch which are distributed on two sides of a medium substrate, a first metal radiation patch which is mutually overlapped with the second dipole radiation patch is arranged at the tail end of the first dipole radiation patch, a second metal radiation patch which is mutually overlapped with the first dipole radiation patch is arranged at the tail end of the second dipole radiation patch, the index gradient balun feed structure is arranged below the dipole radiation unit, and the frequency selective surface structure is arranged above the dipole radiation unit.
Preferably, the exponential gradient balun feed structure comprises a gradient balun ground plane and a feed microstrip line, the gradient balun ground plane is an exponential gradient structure with a wide bottom and a narrow top, the upper end of the gradient balun ground plane is connected with the first dipole radiation patch, the lower end of the gradient balun ground plane is connected with the metal ground plane through the rectangular ground plane, the feed microstrip line is a linear gradient structure with a wide bottom and a narrow top, the feed microstrip line is connected with the second dipole radiation patch, and an opening used for penetrating through the feed microstrip line is formed in the metal ground plane.
Preferably, the feed microstrip line includes a straight line segment and a bent line segment, the straight line segment is located above the metal ground plate and connected to the second dipole radiation patch, and the bent line segment is located below the metal ground plate.
Preferably, the impedance of the feed microstrip line is 50-130 Ω.
Preferably, the frequency selective surface structure includes a first frequency selective surface and a second frequency selective surface, and the first frequency selective surface and the second frequency selective surface are distributed on both sides of the dielectric substrate and are disposed above the first dipole radiation patch and the second dipole radiation patch.
Preferably, the first and second frequency selective surfaces each comprise eight spaced apart rectangular metal patches 1/6 sized to correspond in size to their resonant frequencies.
Preferably, the first dipole radiation patch and the second dipole radiation patch are respectively connected with the metal ground plate through a first short circuit line and a second short circuit line.
Preferably, the first metal radiating patch and the second metal radiating patch are both semicircular.
Preferably, the dielectric substrate has a dielectric constant of 2.2.
Preferably, the metal grounding plate is an aluminum plate.
The dipole tightly-coupled array based on the frequency selective surface has the advantages that compared with the traditional ultra-wideband Vivaldi antenna array, the array has a lower section, so that the array is suitable for a platform with high aerodynamic requirement, and the cross polarization ratio of the array can be effectively reduced; the frequency selective surface structure is used for replacing the traditional medium matching layer, so that the aim of light weight of the antenna array is fulfilled, and the cost is further reduced; the unbalanced feed-balanced port radiation is completed while the impedance conversion is realized through the microstrip line-gradual change balun; the dipole radiation unit, the index gradient balun feed structure and the frequency selection surface structure are integrated on the dielectric substrate, so that the integration of the radiation unit and the feed network is realized, the radiation efficiency of the array is improved, the array is easy to assemble and maintain, and the engineering practicability is high.
Drawings
Fig. 1 is a diagram of an ultra-wide bandwidth scanning angle tightly-coupled phased array antenna (an antenna array is a 10 × 10 array, but only feeds power to a central 8 × 8 array element, and the outer circle is a dummy source; the array is only a specific embodiment of the ultra-wide bandwidth scanning angle tightly-coupled phased array antenna).
FIG. 2 is a schematic diagram of a structure of a periodic unit in the embodiment shown in FIG. 1; fig. 2(a) is a schematic structural diagram of a frequency selective surface structure, and fig. 2(b) is a schematic structural diagram of a graded balun ground plane; fig. 2(c) is a schematic structural diagram of the feed microstrip line.
Fig. 3 shows the active standing wave ratio of the present embodiment scanned along the E-plane in an infinite array environment.
Fig. 4 shows the active standing wave ratio of the present embodiment scanned along the H-plane in an infinite array environment.
Fig. 5 shows the active standing wave ratio of the present embodiment scanned along the D-plane in an infinite array environment.
Fig. 6 is a cross polarization of this embodiment scanned along the E-plane in an infinite array environment.
Fig. 7 is a cross polarization of this embodiment scanned along the H-plane in an infinite array environment.
Fig. 8 is a cross polarization of this embodiment scanned along the D-plane in an infinite array environment.
Fig. 9 is the E-plane and H-plane patterns of the present embodiment when radiating sideways at the frequency point of 0.5GHz in an infinite array environment.
Fig. 10 is the patterns of the E plane and the H plane when the present embodiment radiates laterally at the frequency point of 1GHz in an infinite array environment.
Fig. 11 is the E-plane and H-plane patterns of the present embodiment when radiating sideways at the frequency point of 1.8GHz in an infinite array environment.
FIG. 12 shows the total efficiency of this embodiment when scanning along three principal planes, broadside and E-plane, H-plane and D-plane, in an infinite array environment.
In the figure, 1, a dielectric substrate; 11. a dipole radiation element; 12. a first dipole radiating patch; 121. a first metallic radiating patch; 13. a second dipole radiating patch; 131. a second metallic radiating patch; 14. a first short-circuit line; 15. a second short-circuit line; 2. an exponential taper balun feed structure; 21. a graded balun ground plane; 22. a feed microstrip line; 221. a straight line segment; 222. bending the line segment; 3. a frequency selective surface structure; 31. a first frequency selective surface; 32. a second frequency selective surface; 4. a metal ground plate; 41. windowing; 42. a rectangular ground plane.
Detailed Description
The technical scheme of the invention is further specifically described by combining the drawings and the specific embodiments:
referring to fig. 1 and fig. 2, in the ultra-wide bandwidth scan angle tightly-coupled phased array antenna provided in this embodiment, the antenna array is a 10 × 10 array, but only the central 8 × 8 array elements are fed, and the outer circle is a dummy source.
As shown in fig. 2, a single array element comprises a dielectric substrate 1 which is vertically arranged;
the dipole radiation unit 11, the exponential gradient balun feed structure 2 and the frequency selection surface structure 3 are printed on the dielectric substrate 1;
the metal grounding plate 4 is arranged below the dipole radiation unit 11 and is vertically connected with the dielectric substrate 1;
the dipole radiation unit 11 comprises a first dipole radiation patch 12 and a second dipole radiation patch 13 which are distributed on the front side and the back side of the dielectric substrate 1, a first metal radiation patch 121 which is mutually overlapped with the second dipole radiation patch 13 is arranged at the tail end of the first dipole radiation patch 12, and a second metal radiation patch 131 which is mutually overlapped with the first dipole radiation patch 12 is arranged at the tail end of the second dipole radiation patch 13, so that the overlapped parts form capacitive coupling, a required reactance component is introduced into the array, and the ultra-wideband scanning performance of the antenna is realized; the exponential gradient balun feed structure 2 is arranged below the dipole radiation unit 11, and the frequency selection surface structure 3 is arranged above the dipole radiation unit 11.
Compared with the traditional ultra-wideband Vivaldi antenna array, the dipole tightly-coupled array based on the frequency selective surface has a lower section, so that the array is suitable for a platform with high aerodynamic requirement, and the cross polarization ratio of the array can be effectively reduced; the frequency selective surface structure is used for replacing the traditional medium matching layer, so that the aim of light weight of the antenna array is fulfilled, and the cost is further reduced; the unbalanced feed-balanced port radiation is completed while the impedance transformation is realized through the microstrip line-the gradual change balun; the dipole radiation unit, the exponential gradient balun feed structure and the frequency selective surface structure are all integrated on the vertically placed dielectric substrate, so that the antenna is easy to assemble and maintain, and has strong engineering practicability.
The index gradient balun feed structure 2 comprises a gradient balun ground plane 21 and a feed microstrip line 22, the gradient balun ground plane 21 is an index gradient structure with a wide lower part and a narrow upper part, the upper end of the gradient balun ground plane 21 is electrically connected with the first dipole radiation patch 12, the lower end of the gradient balun ground plane 21 is electrically connected with the metal grounding plate 4 through a rectangular ground plane 42, and the rectangular ground plane 42 is printed on the dielectric substrate 1 and is positioned below the metal grounding plate 4; the feed microstrip line 22 is a linear gradual change structure with a wide bottom and a narrow top, the feed microstrip line 22 is connected with the second dipole radiation patch 13, a window 41 for passing through the feed microstrip line 22 is formed in the metal ground plate 4, and the window 41 is convenient for electromagnetic waves to pass through.
More specifically, the feed microstrip line 22 includes a straight line segment 221 and a bent line segment 222, where the straight line segment 221 is located above the metal ground plate 4 and connected to the second dipole radiation patch 13, and the bent line segment 222 is a serpentine line and located below the metal ground plate 4; the conversion of unbalanced feed-balanced radiation is also completed while realizing the gradual change of the impedance of the feed coaxial 50-omega to 130-omega antenna array.
The frequency selective surface structure 3 is a wide-angle matching structure based on a frequency selective surface, and comprises a first frequency selective surface 31 and a second frequency selective surface 32, wherein the first frequency selective surface 31 and the second frequency selective surface 32 are distributed on the front side and the back side of the dielectric substrate 1 and are arranged above the first dipole radiation patch 12 and the second dipole radiation patch 13; the first frequency selective surface 31 and the second frequency selective surface 32 both include eight rectangular metal patches arranged at intervals, eight pairs of rectangular metal patches are arranged in two rows, and the size of the rectangular metal patches is about 1/6 of the size corresponding to the resonant frequency of the rectangular metal patches, so that impedance conversion from 130 Ω of the antenna to 377 Ω of vacuum can be improved, and the performance of the array during scanning can also be improved; the traditional dielectric matching layer is replaced by the double-layer frequency selective surface structure, so that the traditional thickness of about lambda can be eliminated mid The/4 dielectric plate is used as a dielectric matching layer, so that the weight of the antenna is reduced, and the cost of the antenna is also reduced.
More specifically, the first dipole radiation patch 12 and the second dipole radiation patch 13 are connected to the metal ground plane 4 through a first short-circuit line 14 and a second short-circuit line 15, respectively, to eliminate a common mode resonance point occurring in an array operating frequency band.
More specifically, the first and second metallic radiation patches 121 and 131 may be regular geometric shapes, such as triangles, ovals, semi-circles, and the like. In this embodiment, the first metal radiating patch 121 and the second metal radiating patch 131 are both semicircular, which is beneficial to reducing the reflection effect of current at the patch edge.
More specifically, the dielectric substrate 1 is a Rogers5880 dielectric plate, and the dielectric constant is 2.2.
More specifically, the metal grounding plate 4 is an aluminum plate, and a seam with the width equivalent to that of the dielectric substrate 1 is formed on the metal grounding plate 4, so that the dielectric substrate 1 is convenient to insert, embed and fix, and the metal grounding plate is easy to assemble and maintain and has strong engineering practicability.
Fig. 3 shows the active standing wave ratio scanned along the E-plane in an infinite array environment according to this embodiment, and it can be seen from the figure that the active standing wave ratio is less than 3, and the array can achieve a beam scanning range of ± 45 ° within a frequency band of 0.4-2.0.
Fig. 4 shows the active standing wave ratio scanned along the H plane in an infinite array environment according to this embodiment, and it can be seen from the figure that the active standing wave ratio is less than 3, and the array can achieve a beam scanning range of ± 45 ° within a frequency band of 0.4-2.0.
Fig. 5 shows the active standing wave ratio scanned along the D-plane in an infinite array environment according to this embodiment, and it can be seen from the figure that the array can achieve a beam scanning range of ± 45 ° in a frequency band of 0.4-2.0 under the standard that the active standing wave ratio is less than 3.
FIG. 6 shows the cross polarization of the scanning along the E-plane in the infinite array environment, and it can be seen from the figure that the cross polarization is lower than-12 dB when the scanning angle of the array is + -30 deg. and + -45 deg. in the frequency band of 0.4-2.0.
FIG. 7 shows the cross polarization of the scanning along the H-plane in the infinite array environment, and it can be seen from the figure that the cross polarization is lower than-24 dB and-20 dB when the scanning angle of the array is + -30 deg. and + -45 deg. in the frequency band of 0.4-2.0, respectively.
FIG. 8 shows the cross polarization of the scanning along the D-plane in the infinite array environment, and it can be seen from the figure that the cross polarization is lower than-15 dB when the scanning angle of the array is + -30 deg. and + -45 deg. in the frequency band of 0.4-2.0.
Fig. 9 is the patterns of the E plane and the H plane when the array laterally emits at the frequency point of 0.5GHz in an infinite array environment according to this embodiment, and it can be seen from the patterns that the pattern of the array at the frequency point is smooth and flat, and has better symmetry. It can be seen that the main polarization gain of the cell remains substantially stable as the frequency or scan angle changes, reflecting the characteristics of ultra-wideband and ultra-wide angle scanning.
Fig. 10 is the patterns of the E plane and the H plane when the array laterally emits at the frequency point of 1GHz in an infinite array environment according to this embodiment, and it can be seen from the figure that the pattern of the array at the frequency point is smooth and flat, and has better symmetry. It can be seen that the main polarization gain of the cell remains substantially stable as the frequency or scan angle changes, reflecting the characteristics of ultra-wideband and ultra-wide angle scanning.
Fig. 11 is the patterns of the E plane and the H plane when the array laterally emits at the frequency point of 1.8GHz in an infinite array environment according to this embodiment, and it can be seen from the patterns that the pattern of the array at the frequency point is smooth and flat, and has better symmetry. It can be seen that the main polarization gain of the cell remains substantially stable as the frequency or scan angle changes, reflecting the characteristics of ultra-wideband and ultra-wide angle scanning.
Fig. 12 shows the total efficiency of the present embodiment in the case of side-emission and scanning of three main planes, i.e., E-plane, H-plane, and D-plane, in an infinite array environment, it can be seen from the figure that the efficiency of the array can be maintained at 95% or more except for the extreme frequency points in the case of side-emission, and compared with the efficiency of scanning of E-plane and D-plane, the efficiency of scanning along H-plane can be maintained at the lowest, but can also be maintained at 65% or more.
The above examples are only for illustrating the technical solutions of the present invention, and not for limiting the same; although the present invention has been described in detail with reference to the foregoing embodiments, it should be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; and such modifications or substitutions do not depart from the spirit and scope of the corresponding technical solutions of the embodiments of the present invention.
Claims (10)
1. An ultra-wide bandwidth sweep angle tightly coupled phased array antenna, comprising:
a dielectric substrate (1);
a dipole radiation unit (11), an exponential gradient balun feed structure (2) and a frequency selective surface structure (3) printed on the dielectric substrate (1);
the metal grounding plate (4) is arranged below the dipole radiation unit (11) and is vertically connected with the dielectric substrate (1);
the dipole radiation unit (11) comprises a first dipole radiation patch (12) and a second dipole radiation patch (13) distributed on two sides of a medium substrate (1), a first metal radiation patch (121) mutually overlapped with the second dipole radiation patch (13) is arranged at the tail end of the first dipole radiation patch (12), a second metal radiation patch (131) mutually overlapped with the first dipole radiation patch (12) is arranged at the tail end of the second dipole radiation patch (13), the index gradient balun feed structure (2) is arranged below the dipole radiation unit (11), and the frequency selective surface structure (3) is arranged above the dipole radiation unit (11).
2. The ultra-wide bandwidth scan angle tightly-coupled phased array antenna of claim 1, wherein: the exponential gradient balun feed structure (2) comprises a gradient balun ground plane (21) and a feed microstrip line (22), the gradient balun ground plane (21) is an exponential gradient structure with a wide bottom and a narrow top, the upper end of the gradient balun ground plane (21) is connected with a first dipole radiation patch (12), the lower end of the gradient balun ground plane is connected with a metal ground plane (4) through a rectangular ground plane (42), the feed microstrip line (22) is a linear gradient structure with a wide bottom and a narrow top, the feed microstrip line (22) is connected with a second dipole radiation patch (13), and a windowing window (41) used for penetrating through the feed microstrip line (22) is formed in the metal ground plane (4).
3. The ultra-wide bandwidth scan angle tightly-coupled phased array antenna of claim 2, wherein: the feed microstrip line (22) comprises a straight line section (221) and a bent line section (222), the straight line section (221) is located above the metal grounding plate (4) and connected with the second dipole radiation patch (13), and the bent line section (222) is located below the metal grounding plate (4).
4. An ultrawide bandwidth scan angle tightly coupled phased array antenna, as claimed in claim 2 or 3, wherein: the impedance of the feed microstrip line (22) is 50-130 omega.
5. The ultra-wide bandwidth scan angle tightly-coupled phased array antenna of claim 1, wherein: the frequency selective surface structure (3) comprises a first frequency selective surface (31) and a second frequency selective surface (32), wherein the first frequency selective surface (31) and the second frequency selective surface (32) are distributed on two sides of the dielectric substrate (1) and are arranged above the first dipole radiation patch (12) and the second dipole radiation patch (13).
6. The ultra-wide bandwidth scan angle tightly-coupled phased array antenna of claim 5, wherein: the first frequency selective surface (31) and the second frequency selective surface (32) each comprise eight rectangular metal patches arranged at intervals, and the size of each rectangular metal patch is 1/6 of the corresponding size of the resonant frequency of each rectangular metal patch.
7. The ultra-wide bandwidth scan angle tightly-coupled phased array antenna of claim 1, wherein: the first dipole radiation patch (12) and the second dipole radiation patch (13) are respectively connected with the metal grounding plate (4) through a first short circuit line (14) and a second short circuit line (15).
8. The ultra-wide bandwidth scan angle tightly-coupled phased array antenna of claim 1, wherein: the first metal radiation patch (121) and the second metal radiation patch (131) are both semicircular.
9. The ultra-wide bandwidth scan angle tightly-coupled phased array antenna of claim 1, wherein: the dielectric constant of the dielectric substrate (1) is 2.2.
10. The ultra-wide bandwidth scan angle tightly-coupled phased array antenna of claim 1, wherein: the metal grounding plate (4) is an aluminum plate.
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| CN117175195A (en) * | 2023-03-16 | 2023-12-05 | 广州程星通信科技有限公司 | Broadband wide-angle scanning double-circular polarization antenna array |
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| CN109494464A (en) * | 2018-11-12 | 2019-03-19 | 电子科技大学 | A kind of low-cross polarization ultra wide band close coupling anti-pode dipole phased array antenna |
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| CN117175195A (en) * | 2023-03-16 | 2023-12-05 | 广州程星通信科技有限公司 | Broadband wide-angle scanning double-circular polarization antenna array |
| CN117175195B (en) * | 2023-03-16 | 2024-04-12 | 广州程星通信科技有限公司 | Broadband wide-angle scanning double-circular polarization antenna array |
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