CN114243279B - Broadband multi-linear polarization reconfigurable antenna loaded by double-layer metal sheets - Google Patents
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- CN114243279B CN114243279B CN202111562549.6A CN202111562549A CN114243279B CN 114243279 B CN114243279 B CN 114243279B CN 202111562549 A CN202111562549 A CN 202111562549A CN 114243279 B CN114243279 B CN 114243279B
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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
- 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
- H01Q5/28—Arrangements for establishing polarisation or beam width over two or more different 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
- H01Q5/30—Arrangements for providing operation on different wavebands
Abstract
The invention discloses a broadband multi-linear polarization reconfigurable antenna loaded by double-layer metal sheets, which comprises a dielectric substrate, a metal floor, upper and lower layer feed wafers, upper and lower layer radiation patches, upper and lower layer square bonding pads, upper and lower layer PIN diodes, direct current copper columns, a top layer metal sheet, a bottom layer metal sheet and a coaxial feeder line, wherein the double-layer feed wafers are respectively positioned on two sides of the dielectric substrate, the upper and lower layer radiation patches are 7 groups and are distributed on the periphery of the upper and lower layer feed wafers at equal angles, the PIN diodes are arranged between the upper and lower layer radiation patches and the feed wafers, the top layer metal sheet is positioned above the dielectric substrate and is connected with the upper layer feed wafer through a metal connecting column, and the lower layer metal sheet is positioned below the dielectric substrate and is directly welded on the outer skin of the coaxial feeder line. 7 linear polarization reconfigurability can be realized by controlling the on-off of the PIN; the working bandwidth can be greatly expanded through special radiation layer shape design and double-layer metal sheet loading. The antenna has the characteristics of small volume, wide frequency band, more polarization reconfigurable numbers and the like.
Description
Technical Field
The invention relates to the technical field of antennas, in particular to a broadband multi-line polarization reconfigurable antenna loaded by double-layer metal sheets and a design method thereof.
Background
With the continuous progress of information technology, the wireless communication technology has rapidly developed. The devices required by modern wireless communication technology need to have the characteristics of high speed, wide frequency band, strong anti-interference performance and the like, and the functions of the technical requirements on the improvement of the quality of a communication link are fully proved in various applications in the past decades. As a key device of a wireless information system, the operating performance of an antenna directly affects the performance of the whole system. The antenna needs to be designed according to specific requirements to realize certain specific functions, the structure and the performance are relatively fixed, the changeable space is small, and the antenna cannot adapt to various working environments and working requirements of modern wireless systems. In some scenarios where multiple functions are required, such as software defined radio, it may operate at different frequencies and polarization states. Various protocols are used to maximize power transmission, reduce polarization mismatch loss, and suppress multipath fading loss, whereas conventional fixed structure designs cannot achieve multiple functions with one antenna.
As a novel antenna, the current distribution on the surface of the antenna is changed essentially by changing the structure of the antenna or changing the feed structure, so that the antenna works in different modes, and the reconstruction of one or more modes such as the polarization direction, the working frequency, the radiation pattern and the like is realized. With the wide use of various wireless communication devices, the interference influence of external electromagnetic waves on the communication devices gradually becomes greater, and thus the polarization reconfigurable antenna receives wide attention. The polarization reconfigurable antenna can reduce multipath fading loss, improve signal transmission performance, avoid polarization mismatch and reduce interference of other systems, and can realize switching of various polarization states such as left-hand circular polarization, right-hand circular polarization, linear polarization and the like through polarization diversity, realize polarization adaptation in different scenes and greatly reduce interference.
A multi-linear polarization reconfigurable antenna is a type of antenna that can be switched between a plurality of linear polarizations in different directions. Because the polarization mismatch loss of 50% always exists between linear polarization and circular polarization, when linear polarization incoming waves in various directions are received, the multi-linear polarization reconfigurable antenna can well solve the problem of polarization mismatch between single polarization antennas. The more linear polarization can be realized, the more polarization selection can be realized in practical application, and therefore, the method has great advantages in the aspects of polarization modulation, multipath fading resistance and the like. Therefore, in recent years, a multi-line polarization reconfigurable antenna has received much attention. From the published documents and published patents at present, the research on the polarization reconfigurable antenna mostly focuses on the antenna capable of switching between left-right circular polarization and linear polarization and circular polarization, the structure of the multi-linear polarization antenna can be realized, the number of linear polarizations does not exceed 4, and the multi-linear polarization reconfigurable antenna is just started in recent years, but the development trend is rapid.
The Chinese invention patent (CN 212011260U) provides a broadband polarization reconfigurable antenna based on cross dipoles and parasitic units, and the broadband performance is realized through a special 3/4 feed square ring, but only the switching between two circular polarizations and one linear polarization is realized, and the multi-linear polarization reconfigurable antenna cannot be realized.
The invention patent of China (CN 106229668A) provides a broadband polarization reconfigurable base station antenna, which realizes the state switching of two linear polarizations and two circular polarizations by two groups of oscillators distributed in a crossed manner, but the feed network part of the broadband polarization reconfigurable base station antenna is a Wilkinson power divider, the structure is more complex, and the number of linear polarizations is not enough to adapt to a complex communication environment.
Ge Lei doctor et al, in document "a New quadr-Polarization configurable circuit Antenna, IEEE Access, vol.4, pp.4646-4651, 2016.doi.
The chinese invention patent (CN 108963449 a) proposes a multi-linear polarization reconfigurable antenna integrated with artificial magnetic conductors and a design method thereof, although the multi-linear polarization characteristic is realized, the working bandwidth in each polarization state is only 20%, the bandwidth is relatively narrow, and the application requirements of multi-band and multi-function cannot be met.
In conclusion, the design of the multi-linear polarization reconfigurable antenna with the broadband performance has important research and application values.
Disclosure of Invention
In order to solve the problems of limited linear polarization number and narrow bandwidth in the prior art in the background art, the invention provides a metal sheet loaded broadband polarization reconfigurable antenna, which adopts a rotationally symmetric multi-linear polarization reconfigurable antenna unit, realizes the linear polarization reconfiguration in 7 different directions on a pair of antennas by controlling PIN diodes, and effectively expands the bandwidth by combining the loading of double-layer metal sheets. The whole structure of the antenna is a rotational symmetry structure, and the consistency of the directional diagram shape, the gain, the efficiency and other performances in all polarization directions can be ensured, so that the antenna is also suitable for array analysis.
The invention adopts the following technical scheme: a broadband polarization reconfigurable antenna loaded by double-layer metal sheets comprises a dielectric substrate, a metal floor, an upper feeding wafer, an upper radiation patch, an upper patch inductor, an upper square bonding pad, an upper PIN diode, a lower feeding wafer, a lower radiation patch, a lower patch inductor, a lower square bonding pad, a lower PIN diode, a direct current copper column, a top metal sheet, a bottom metal sheet, an upper connecting column and a coaxial feeder line; the upper-layer radiation patches of the broadband multi-linear polarization reconfigurable antenna loaded by the double-layer metal sheet are 7 groups, the circumferences of the upper-layer radiation patches are distributed on the periphery of the upper-layer feed wafer at equal angles, and the head of the upper-layer radiation patches is connected with the upper-layer feed wafer through a PIN diode; the lower layer radiation patches are 7 groups and are distributed on the periphery of the upper layer feed wafer at equal angles on the circumference, and the heads of the lower layer radiation patches are connected with the lower layer feed wafer through PIN diodes; the tail part of the upper radiation patch is connected with the upper square bonding pad through an upper patch inductor, and the tail part of the lower radiation patch is connected with the lower square bonding pad through a lower patch inductor; the direct current copper columns are vertically distributed at the lower ends of the upper layer square bonding pad and the lower layer square bonding pad and are welded tightly.
Preferably, the top metal sheet is cylindrical, made of iron, 0.127mm thick and located above the dielectric substrate, and the top metal sheet and the dielectric substrate are connected through an upper layer connecting column.
Preferably, the bottom metal sheet is cylindrical, is located between the dielectric substrate and the metal floor, is made of iron, has a thickness of 0.127mm, and is directly connected with the outer conductor of the coaxial feeder.
Preferably, the dielectric substrate, the metal floor, the upper layer feed wafer, the lower layer feed wafer, the top layer metal sheet, the bottom layer metal sheet, the upper layer connecting column and the coaxial feeder are circular or cylindrical, the upper layer radiation patch, the upper layer patch inductor, the upper layer square bonding pad, the upper layer PIN diode, the lower layer radiation patch, the lower layer patch inductor, the lower layer square bonding pad and the lower layer PIN diode are 7 groups of structures with the same size and shape and the same model, and are symmetrically arranged along the center of the z axis, and the broadband multi-linear polarization reconfigurable antenna loaded by the double layers of metal sheets has the characteristic of complete rotational symmetric distribution.
Preferably, the upper feed wafer, the upper radiation patch and the upper square bonding pad are etched on the front surface of the dielectric substrate, and the lower feed wafer, the lower radiation patch and the lower square bonding pad are etched on the back surface of the dielectric substrate.
Preferably, the coaxial feeder is located at a central axis of the overall structure, the outer conductor is welded to the lower layer feeding wafer, and the inner conductor of the coaxial feeder penetrates through the dielectric substrate and is welded to the upper layer feeding wafer to form the differential feeding.
Preferably, the signals fed by the coaxial feeder line include radio frequency signals and 0V direct current signals.
Preferably, the upper layer radiation patch and the lower layer radiation patch are both 7 groups of structures with grooves in the middle, and the shapes of the patches are desk lamp shapes, so that a broadband radiation oscillator is formed.
Preferably, the direct current copper column penetrates through the dielectric substrate and the metal floor, and is connected with a direct current power supply below the metal floor.
Preferably, the upper radiation patch and the lower radiation patch are etched on the front surface and the back surface of the substrate, and overlapped parts are arranged on the front surface and the back surface of the substrate, a small gap is reserved at the head part of each upper radiation patch, and a small gap is reserved at the head part of each lower radiation patch.
Compared with the prior art, the invention has the following beneficial effects:
1. the antenna greatly expands the working bandwidth by loading a two-layer metal sheet structure, and has broadband characteristics on the basis of multi-line polarization reconfigurable performance;
2. the antenna has the advantages that the impedance of the antenna is well regulated and controlled by designing the dipole structure in a shape of a table lamp, the dipoles at the upper part and the lower part are overlapped in a large area, and the working bandwidth of the antenna is improved by utilizing the coupling effect;
3. the antenna radiator part is of a rotational symmetric structure, realizes linear polarization in 7 different directions, and is favorable for further expanding the polarization number.
4. The antenna works in X wave band with radius of only 6mm (0.48 lambda) h ) And the method can be used for large-scale array without grating lobes.
Drawings
FIG. 1 is a schematic three-dimensional structure of an embodiment of the present invention;
FIGS. 2 and 3 are top views of partial structures of the embodiment of the present invention;
FIG. 4 is a side view of an embodiment of the present invention;
FIG. 5 is an equivalent circuit diagram of a diode used in the embodiment of the present invention in an on/off state;
FIG. 6 is a plot of return loss versus frequency for an embodiment of the present invention;
FIG. 7 is a graph of impedance versus frequency for an embodiment of the present invention;
FIG. 8 is the main polarization and cross polarization patterns of the E-plane and H-plane of the present invention at 8 GHz;
FIG. 9 is the main polarization and cross polarization patterns of the E-plane and H-plane of the embodiment of the present invention at 9 GHz;
FIG. 10 shows the main polarization and cross polarization patterns of the E-plane and H-plane of the present invention at 10 GHz;
FIG. 11 is the main polarization and cross polarization patterns of the E-plane and H-plane of the present invention at 11 GHz;
FIG. 12 is the main polarization and cross polarization patterns for plane E and plane H at 12GHz according to an embodiment of the present invention;
FIG. 13 is the main polarization and cross polarization patterns for the E-plane and H-plane of the embodiment of the present invention at 13 GHz;
FIG. 14 is the primary and cross polarization patterns for plane E and plane H at 14GHz according to an embodiment of the present invention;
fig. 15 is a graph showing the maximum gain of each frequency point within the operating frequency band according to the embodiment of the present invention as a function of frequency.
Detailed Description
In the description of the present invention, it should also be noted that, unless otherwise explicitly specified or limited, the terms "disposed," "mounted," "connected," and "connected" are to be construed broadly and may, for example, be fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art.
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
As shown in fig. 1, the present invention provides a technical solution: the utility model provides a broadband polarization reconfigurable antenna of sheetmetal loading, includes, dielectric substrate 1, metal floor 2, upper feed disk 3, upper radiation paster 4, upper patch inductance 5, upper square pad 6, upper PIN diode 7, lower feed disk 8, lower radiation paster 9, lower patch inductance 10, lower square pad 11, lower PIN diode 12, direct current copper post 13, top layer sheetmetal 14, bottom sheetmetal 15, upper spliced pole 16, coaxial feeder 17. The direct current copper columns 13 are vertically distributed at the lower ends of the upper layer square bonding pad 6 and the lower layer square bonding pad 9 and are tightly welded.
As shown in fig. 2, the upper layer radiation patches 4 are 7 groups and are circumferentially distributed at equal angles around the upper layer feed wafer 3, the head of the upper layer radiation patch 4 is connected with the upper layer feed wafer 3 through a PIN diode 7, and the tail of the upper layer radiation patch 4 is connected with the upper layer square bonding pad 6 through an upper layer patch inductor 5.
As shown in fig. 3, the lower radiation patches 9 are 7 groups and are circumferentially distributed around the upper feed wafer 8 at equal angles, the heads of the lower radiation patches 9 are connected to the lower feed wafer 8 through lower PIN diodes 12, and the tails of the lower radiation patches 9 are connected to lower square pads 11 through lower patch inductors 10.
Further, as shown in fig. 2 and 3, as seen from the top views of the upper and lower surfaces of the dielectric substrate 1, it can be seen that the upper radiation patches 4 and the lower radiation patches 9 are etched on the front and back surfaces of the dielectric substrate 1 and have overlapping portions, a small gap is left at the head of each upper radiation patch 4, and a small gap is left at the head of each lower radiation patch 9. The upper radiation patch 4 and the lower radiation patch 9 are both 7 groups of structures with grooves in the middle, and are shaped like desk lamps to form a broadband radiation oscillator. In FIG. 2, 7 polarization directions are indicated and numbered as "#0- # 7".
The size parameters of the upper oscillator radiation patch 4 and the lower oscillator radiation patch 9 are as follows:
l1=4.30mm, w1=0.73mm, w2=1.85mm, s1=1.00mm, and s2=0.35mm. The side length of the upper layer square bonding pad 6 and the lower layer square bonding pad 9 is 0.4mm. The upper layer patch inductor 5 and the lower layer patch inductor 10 play a role of direct current resistance and alternating current, the length is 0.6mm, the width is 0.3mm, and the inductance value L =39nH.
Further, as can be seen from fig. 2 and 3, the dielectric substrate 1, the metal floor 2, the upper feeding wafer 3, the lower feeding wafer 8, the top metal sheet 14, the bottom metal sheet 15, the upper connecting post 16 and the coaxial feeder 17 are all circular or cylindrical; the upper-layer radiation patch 4, the upper-layer patch inductor 5, the upper-layer square bonding pad 6, the upper-layer PIN diode 7, the lower-layer radiation patch 9, the lower-layer patch inductor 10, the lower-layer square bonding pad 11 and the lower-layer PIN diode 12 are all 7 groups of structures with the same size, shape and model, and are arranged along the central symmetry of the z axis, and the broadband multi-linear polarization reconfigurable antenna loaded by the double-layer metal sheet has complete rotational symmetry distribution.
As shown in fig. 4, the top metal sheet 14 is circular, made of iron, has a thickness T1=0.127mm and a radius R1=1mm, and is located above the dielectric substrate, and the top metal sheet 14 and the dielectric substrate 1 are connected by an upper connection column 16, which has a radius R2=0.1mm and a height of 3.5mm, and is made of iron. The bottom metal sheet 15 is cylindrical, is located between the dielectric substrate 1 and the metal floor 2, is made of iron, has a thickness of T3=0.127mm and a radius of R3=1mm, and is directly connected to the outer conductor of the coaxial feeder 17. The radius of the dielectric substrate 1 is R4=6mm, the radius of the metal floor 2 is R5=16mm, and the distance between the dielectric substrate 1 and the metal floor 2 is 8mm. The upper-layer feed wafer 3, the upper-layer radiation patch 4 and the upper-layer square bonding pad 6 are etched on the front surface of the dielectric substrate, and the lower-layer feed wafer 8, the lower-layer radiation patch 9 and the lower-layer square bonding pad 11 are etched on the back surface of the dielectric substrate.
As shown in fig. 5, the PIN diode is a switching diode, with model MA4AGP907, and has a length P1=0.66mm and a width P2=0.35mm.
The radius of the inner conductor of the coaxial feeder 17 is 0.12mm, the radius of the outer conductor is 0.4mm, the inner conductor is located at the central axis position of the integral structure, the outer conductor is welded with the lower layer feed wafer 8, and the inner conductor of the coaxial feeder 17 penetrates through the dielectric substrate 1 and is welded with the upper layer feed wafer 3 to form differential feed. The signals fed by the coaxial feed line 17 include radio frequency signals and 0V direct current signals. The total number of the direct current copper columns 13 is 14, the direct current copper columns are uniformly distributed on the edge of the dielectric substrate 1, penetrate through the dielectric substrate 1 and the metal floor 2, and are connected with a direct current power supply below the metal floor 2. In the figure, a dc power supply is not shown, and the dc power supply may be disposed behind the lower dielectric substrate 2, and a 1.5V battery may be used in this example.
When the present embodiment operates, a group of PIN diodes is selectively turned on by the dc power supply and the Bias T, so that the pair of upper-layer oscillator radiation patches 401 and the lower-layer oscillator radiation patches 901 can be excited to operate. If the polarization direction needs to be changed, only different PIN diodes need to be connected. Therefore, the function of reconfigurable electric control multi-wire polarization is realized.
Based on the above, simulations were modeled in HFSS, with the results shown in fig. 6-15. Since the structure of the embodiment has rotational symmetry, only simulation results of 1 polarization direction need to be given. As can be concluded from fig. 6, the impedance bandwidth of the broadband polarization reconfigurable antenna loaded by the double-layer metal sheet provided by this embodiment is 58%, covers a frequency band of 7.76-14.13GHz, and has broadband characteristics.
As can be seen from the directional diagrams of the frequency points in the working frequency bands of fig. 8 to 14, the main polarization shape of the antenna directional diagram at each frequency point is basically kept unchanged, and the antenna directional diagram has the characteristic of unidirectional radiation; the cross polarization is far lower than the main polarization, and the linear polarization characteristic is good.
As can be seen from the curve of the maximum practical gain in the operating frequency band with the frequency change in fig. 15, the gain in the full frequency band is in the range of 2-6dBi, which indicates that the antenna has good directional radiation characteristics.
Finally, it should be noted that: although the present invention has been described in detail with reference to the foregoing embodiments, it will be apparent to those skilled in the art that modifications may be made to the embodiments or portions thereof without departing from the spirit and scope of the invention.
Claims (6)
1. A broadband multi-wire polarization reconfigurable antenna loaded by double-layer metal sheets is characterized by comprising a dielectric substrate (1), a metal floor (2), an upper-layer feed wafer (3), an upper-layer radiation patch (4), an upper-layer patch inductor (5), an upper-layer square bonding pad (6), an upper-layer PIN diode (7), a lower-layer feed wafer (8), a lower-layer radiation patch (9), a lower-layer patch inductor (10), a lower-layer square bonding pad (11), a lower-layer PIN diode (12), a direct-current copper column (13), a top-layer metal sheet (14), a bottom-layer metal sheet (15), an upper-layer connecting column (16) and a coaxial feeder (17); the upper-layer radiation patches (4) of the broadband multi-linear polarization reconfigurable antenna loaded by the double-layer metal sheet are 7 groups, the circumferences of the upper-layer radiation patches are distributed on the periphery of the upper-layer feed wafer (3) at equal angles, and the head of the upper-layer radiation patch (4) is connected with the upper-layer feed wafer (3) through a PIN diode (7); the lower-layer radiation patches (9) are 7 groups, the circumferences of the lower-layer radiation patches are distributed on the periphery of the upper-layer feed wafer (8) at equal angles, and the heads of the lower-layer radiation patches (9) are connected with the lower-layer feed wafer (8) through PIN diodes (12); the tail of the upper radiation patch (4) is connected with the upper square bonding pad (6) through an upper patch inductor (5), and the tail of the lower radiation patch (9) is connected with the lower square bonding pad (11) through a lower patch inductor (10); the direct current copper columns (13) are vertically distributed at the lower ends of the upper layer square bonding pad (6) and the lower layer square bonding pad (9) and are welded tightly;
the top metal sheet (14) is cylindrical and is positioned above the dielectric substrate (1), and the top metal sheet (14) is connected with the dielectric substrate (1) through an upper connecting column (16);
the bottom layer metal sheet (15) is cylindrical, is positioned between the dielectric substrate (1) and the metal floor (2), and is directly connected with an outer conductor of the coaxial feeder (17);
the upper-layer radiation patch (4) and the lower-layer radiation patch (9) are both 7 groups of structures with grooves in the middle, and are shaped like desk lamps to form a broadband radiation oscillator;
the upper radiation patch (4) and the lower radiation patch (9) are etched on the front surface and the back surface of the substrate and have overlapped parts, a small gap is reserved at the head of each upper radiation patch (4), and a small gap is reserved at the head of each lower radiation patch (9).
2. The broadband multi-wire polarization reconfigurable antenna loaded by the double-layer metal sheet as claimed in claim 1, wherein: the broadband multi-wire polarization reconfigurable antenna comprises a dielectric substrate (1), a metal floor (2), an upper layer feed wafer (3), a lower layer feed wafer (8), a top layer metal sheet (14), a bottom layer metal sheet (15), an upper layer connecting column (16) and a coaxial feeder line (17), wherein the upper layer feed wafer is circular or cylindrical, an upper layer radiation patch (4), an upper layer patch inductor (5), an upper layer square pad (6), an upper layer PIN diode (7), a lower layer radiation patch (9), a lower layer patch inductor (10), a lower layer square pad (11) and a lower layer PIN diode (12) are 7 groups of structures with the same size, shape and model, and are symmetrically arranged along the center of a z axis, and the broadband multi-wire polarization reconfigurable antenna loaded by the double layers of metal sheets has the characteristic of complete rotational symmetric distribution.
3. The broadband multi-wire polarization reconfigurable antenna loaded by the double-layer metal sheet as claimed in claim 1, wherein: the upper-layer feed wafer (3), the upper-layer radiation patch (4) and the upper-layer square bonding pad (6) are etched on the front surface of the dielectric substrate (1), and the lower-layer feed wafer (8), the lower-layer radiation patch (9) and the lower-layer square bonding pad (11) are etched on the back surface of the dielectric substrate (1).
4. The broadband multi-wire polarization reconfigurable antenna loaded by the double-layer metal sheet as claimed in claim 1, wherein: the coaxial feeder (17) is positioned at the central shaft position of the integral structure, the outer conductor is welded with the lower layer feed wafer (8), and the inner conductor of the coaxial feeder (17) penetrates through the dielectric substrate (1) and is welded with the upper layer feed wafer (3).
5. The broadband multi-wire polarization reconfigurable antenna loaded by the double-layer metal sheet as claimed in claim 1, wherein: the signals fed by the coaxial feeder (17) comprise radio frequency signals and 0V direct current signals.
6. The broadband multi-wire polarization reconfigurable antenna loaded by the double-layer metal sheet as claimed in claim 1, wherein: the direct current copper column (13) penetrates through the dielectric substrate (1) and the metal floor (2), and is connected with a direct current power supply below the metal floor (2).
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| US7495627B2 (en) * | 2007-06-14 | 2009-02-24 | Harris Corporation | Broadband planar dipole antenna structure and associated methods |
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| CN204011711U (en) * | 2014-08-06 | 2014-12-10 | 成都信息工程学院 | A kind of capacitive load microstrip antenna |
| CN105406185A (en) * | 2015-12-14 | 2016-03-16 | 天津大学 | Miniature dual-band broadband patch antenna |
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