CN212380560U - A Differential Duplex Filter Antenna with Double Slot Symmetric Excitation - Google Patents

A Differential Duplex Filter Antenna with Double Slot Symmetric Excitation Download PDF

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CN212380560U
CN212380560U CN201922429892.8U CN201922429892U CN212380560U CN 212380560 U CN212380560 U CN 212380560U CN 201922429892 U CN201922429892 U CN 201922429892U CN 212380560 U CN212380560 U CN 212380560U
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metal
microstrip
ring
metal microstrip
split resonator
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谢泽明
伍泽科
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South China University of Technology SCUT
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South China University of Technology SCUT
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Abstract

The utility model discloses a difference duplex filtering antenna of double flute symmetry excitation. The antenna comprises an upper-layer dielectric substrate, a lower-layer dielectric substrate, a metal floor, a first metal feed microstrip line, a second metal feed microstrip line, a metal rectangular radiation patch, a coupling gap, a metal microstrip resonator, a first metal microstrip open-ended resonance ring, a second metal microstrip open-ended resonance ring, a third metal microstrip open-ended resonance ring and a fourth metal microstrip open-ended resonance ring. The utility model discloses with a compact structure, realized radiation, duplex synthesis, channel filtering, differential feed and balanced-unbalanced transformation function simultaneously, guaranteed good cross polarization performance, lobe symmetry and duplex filtering radiation ability.

Description

Double-slot symmetrically excited differential duplex filtering antenna
Technical Field
The utility model relates to a wireless communication antenna field, concretely relates to difference duplex filtering antenna of double flute symmetry excitation.
Background
In recent years, designing highly miniaturized and integrated rf front-end modules has become a future development trend, and therefore, researchers have attracted attention to designing rf front-end systems with small volume and high integration. With the deep research on the bandwidth broadening, cross polarization, frequency selectivity and radiation performance of the filtering antenna, the method lays a foundation for the research of the duplex antenna. In the duplex antenna, the same antenna is used for signal receiving and signal transmitting, so that the duplex antenna can reduce the cost and the volume of the system.
Conventionally, the antenna and the duplexer are separately designed, and finally, the design of the filtering antenna is realized by connecting a 50 Ω transmission line and a matching network in series, but this results in an increase in the size of the structure and the insertion loss. A filtering antenna, in which an antenna not only plays a role of radiation but also has a filtering function, is a new technology that has been receiving attention in recent years, and thus the filtering antenna has a small size.
In the existing duplex antenna technology, the cross polarization performance and the symmetry of radiation lobes are not sufficient (y.lee, j.tar and s.chung, "a filtering differentiating antenna for dual-band operation with spatial radiation patterns and low cross-polarization," in IEEE Antennas and Wireless Propagation weights, vol.16, pp.58-61,2017.). Poor cross-polarization performance can affect polarization purity of the antenna, which can cause communication efficiency reduction and interference; asymmetric lobes are difficult to meet for certain applications such as measurement, positioning, etc.
Therefore, a duplex antenna with a compact structure, a duplex filtering characteristic, and good cross polarization performance and symmetrical lobes is an important requirement in the fields of communication technology and antenna technology (h.jin, g.q.luo, w.che, k.chi, y.pan and y.yu, "vertical-integrated differential filtering by a basic bandwidth filter," in IET Microwaves, Antennas & processing, 13, No.3, pp.300-304,2722019).
SUMMERY OF THE UTILITY MODEL
An object of the utility model is to overcome prior art's is not enough, provides one kind and has radiation, filtering, duplex performance simultaneously to there is the duplex filtering antenna of good cross polarization characteristic and symmetrical radiation lobe. The utility model has the advantages of small volume, high integration level, low cross polarization and symmetrical radiation lobes.
The purpose of the utility model can be realized at least through following technical scheme.
A double-slot symmetrically excited differential duplex filtering antenna comprises an upper-layer dielectric substrate, a lower-layer dielectric substrate, a metal floor, a first metal feed microstrip line, a second metal feed microstrip line, a metal rectangular radiation patch, a coupling gap, a metal microstrip resonator, a first metal microstrip open-ended resonance ring, a second metal microstrip open-ended resonance ring, a third metal microstrip open-ended resonance ring and a fourth metal microstrip open-ended resonance ring;
the upper-layer dielectric substrate, the metal floor and the lower-layer dielectric substrate are bonded together, and the metal floor is embedded between the upper-layer dielectric substrate and the lower-layer dielectric substrate; two coupling gaps which are arranged in parallel are carved on the metal floor;
the metal rectangular radiation patch is attached to the upper surface of the upper-layer dielectric substrate, the center of the metal rectangular radiation patch is superposed with the center of the upper-layer dielectric substrate, the length of the metal rectangular radiation patch is one half of the waveguide wavelength, and the width of the metal rectangular radiation patch is larger than the distance between the two coupling gaps;
a first metal feed microstrip line, a second metal feed microstrip line, a metal microstrip resonator, a first metal microstrip open resonant ring, a second metal microstrip open resonant ring, a third metal microstrip open resonant ring and a fourth metal microstrip open resonant ring are attached to the lower surface of the lower-layer dielectric substrate; the second metal microstrip open-ended resonant ring, the first metal microstrip open-ended resonant ring, the third metal microstrip open-ended resonant ring and the fourth metal microstrip open-ended resonant ring are sequentially arranged from one side to the other side of the lower surface of the lower-layer dielectric substrate along the central axis of the lower-layer dielectric substrate; the metal microstrip resonator passes through the center of the lower surface of the lower dielectric substrate and is positioned between the first metal microstrip open-ended resonant ring and the third metal microstrip open-ended resonant ring; the first metal feed microstrip line and the second metal feed microstrip line are respectively connected with the second metal microstrip open-ended resonant ring and the fourth metal microstrip open-ended resonant ring.
Furthermore, the upper dielectric substrate, the lower dielectric substrate, the metal floor, the metal rectangular radiation patch, the coupling slot, the metal microstrip resonator, the first metal microstrip open-ended resonant ring, the second metal microstrip open-ended resonant ring, the third metal microstrip open-ended resonant ring and the fourth metal microstrip open-ended resonant ring all have symmetrical structures, and the symmetrical surfaces are coincident.
Furthermore, the two coupling gaps are symmetrically distributed on two sides of a common symmetric plane of the upper-layer dielectric substrate, the lower-layer dielectric substrate, the metal floor, the metal rectangular radiation patch, the metal microstrip resonator, the first metal microstrip open-ended resonance ring, the second metal microstrip open-ended resonance ring, the third metal microstrip open-ended resonance ring and the fourth metal microstrip open-ended resonance ring. The distance between the two coupling gaps is larger than the widths of the first metal microstrip open-ended resonant ring, the second metal microstrip open-ended resonant ring, the third metal microstrip open-ended resonant ring and the fourth metal microstrip open-ended resonant ring, and is shorter than the length of the metal microstrip resonator.
Furthermore, the metal microstrip resonator is a metal strip passing through the center of the lower surface of the lower dielectric substrate and perpendicular to the common symmetric plane of the upper dielectric substrate, the lower dielectric substrate, the metal floor, the metal rectangular radiation patch, the coupling slot, the first metal microstrip open-ended resonance ring, the second metal microstrip open-ended resonance ring, the third metal microstrip open-ended resonance ring and the fourth metal microstrip open-ended resonance ring.
Furthermore, the first metal microstrip open resonator ring, the second metal microstrip open resonator ring, the third metal microstrip open resonator ring and the fourth metal microstrip open resonator ring are all rectangular rings surrounded by microstrip lines, and an opening is formed in the middle of one edge of each rectangular ring.
Furthermore, the first metal microstrip open-ended resonant ring and the third metal microstrip open-ended resonant ring are respectively distributed on two sides of the metal microstrip resonator, and the side of the rectangular ring parallel to the side with the opening is close to the metal microstrip resonator and parallel to the metal microstrip resonator;
the edge with the opening in the second metal microstrip open-ended resonant ring is close to and parallel to the edge with the opening in the first metal microstrip open-ended resonant ring; the edge with the opening in the fourth metal microstrip open-ended resonant ring is close to and parallel to the edge with the opening in the third metal microstrip open-ended resonant ring.
Further, the second metal microstrip open-ended resonant ring feeds power through the first metal feed microstrip line; the fourth metal microstrip open-ended resonant ring feeds through a second metal feed microstrip line);
one end of the first metal feed microstrip line can be connected to any edge of the second metal microstrip open-ended resonant ring, and the other end of the first metal feed microstrip line is connected with a feed signal source; one end of the second metal feed microstrip line can be connected to any edge of the fourth metal microstrip open-ended resonant ring, and the other end of the second metal feed microstrip line is connected with a feed signal source.
Furthermore, the upper dielectric substrate, the metal floor and the metal rectangular radiation patch form a microstrip antenna, the metal microstrip resonator is mutually coupled with the microstrip antenna through a coupling slot to form a dual-frequency antenna, and the dual-frequency antenna resonates at two working frequencies, namely a transmitting frequency and a receiving frequency; because the symmetry of the structure, namely the upper dielectric substrate, the metal floor, the metal rectangular radiation patch, the metal microstrip resonator and the coupling slot have a common symmetry plane, the field distribution on the dual-frequency antenna is symmetrical about the symmetry plane on the transmitting frequency and the receiving frequency to form a dual-frequency differential antenna, so that the radiation lobes are symmetrical and have a restraining effect on cross polarization.
Furthermore, the metal microstrip resonator simultaneously plays a role in synthesizing two paths of signals, so that a duplex antenna is formed; the first metal microstrip open-ended resonant ring and the second metal microstrip open-ended resonant ring resonate at a resonant frequency of the dual-frequency antenna to form a filter of one channel with the resonant mode of the dual-frequency antenna, the third metal microstrip open-ended resonant ring and the fourth metal microstrip open-ended resonant ring resonate at another resonant frequency of the dual-frequency antenna, and the resonant mode of the dual-frequency antenna forms a filter of another channel, so that the two channels of the dual-frequency antenna have filtering characteristics, and a filtering antenna is formed; because the first metal microstrip open-ended resonant ring, the second metal microstrip open-ended resonant ring, the third metal microstrip open-ended resonant ring and the fourth metal microstrip open-ended resonant ring are all of symmetrical structures and have the same symmetrical plane with the dual-frequency antenna, the two channel filters are both differential filters, so that the differential excitation of the dual-frequency antenna is ensured, and the good cross polarization performance and the symmetry of a radiation lobe are ensured; the first metal feed microstrip line and the second metal feed microstrip line respectively carry out single-end excitation on the split resonant ring and the split resonant ring, so that the split resonant ring has a balance-unbalance conversion function.
The dual-frequency antenna is not only a radiation unit, but also a duplex synthesis unit, and is also a frequency-selecting resonance unit of the channel filter, so that the utility model has compact structure.
Furthermore, a signal of one channel carries out differential feed on the dual-frequency antenna through the first metal feed microstrip line, the second metal microstrip open-ended resonant ring and the first metal microstrip open-ended resonant ring, and is radiated through the metal rectangular radiation patch;
and the signal of the other channel carries out differential feed on the dual-frequency antenna through the second metal feed microstrip line, the fourth metal microstrip open resonant ring and the third metal microstrip open resonant ring, and the signal cannot leak to the channel connected with the first metal feed microstrip line due to the inhibition effect of a channel filter formed by the second metal microstrip open resonant ring and the first metal microstrip open resonant ring through the radiation of the metal rectangular radiation patch, so that the isolation of the channel is realized.
The utility model discloses with a compact structure, realized radiation, duplex synthesis, channel filtering, differential feed and balanced-unbalanced transformation function simultaneously, guaranteed good cross polarization performance, lobe symmetry and duplex filtering radiation ability.
The utility model discloses compare in prior art, have following beneficial effect:
1. the utility model discloses a common design of filter circuit and duplex antenna, consequently do not need unnecessary matching circuit, and because the substrate integration of antenna is in the same place for filter antenna has advantages such as the integrated level is high, the size is little, light in weight.
2. The utility model provides a duplex filtering antenna has better bandwidth broadening; the antenna can be used as a basic unit of the antenna to carry out array, and the antenna has a large research space.
3. The utility model provides a duplex antenna adopts the dual-port input structure of symmetry formula, can realize symmetrical radiation and low cross polarization.
Drawings
Fig. 1 is a general schematic diagram of a dual-slot symmetric-excited differential duplex filtering antenna according to an embodiment of the present invention.
Fig. 2 is a schematic diagram of the overall size of a dual-slot symmetric-excited differential duplex filtering antenna according to an embodiment of the present invention.
Fig. 3 is a side view of a dual-slot symmetric excited differential duplex filtering antenna according to an embodiment of the present invention.
Fig. 4 is a schematic specific dimension diagram of a dual-slot symmetric-excited differential duplex filtering antenna according to an embodiment of the present invention.
Fig. 5 is a graph of simulation results of S-parameters of a dual-slot symmetric excited differential duplex filtering antenna according to an embodiment of the present invention.
Fig. 6 is a graph of far field gain of a vertical antenna center as a function of frequency for a dual-slot symmetric excited differential duplex filtering antenna according to an embodiment of the present invention.
Fig. 7 is a far field pattern of a dual-slot symmetric excited differential duplex filtering antenna with Φ equal to 0 ° at f equal to 2GHz according to an embodiment of the present invention.
Fig. 8 is a far field pattern of a dual-slot symmetric excited differential duplex filtering antenna with Φ equal to 0 ° when f is 2.45GHz in an embodiment of the present invention.
Fig. 9 is a far field pattern of a dual-slot symmetric excited differential duplex filtering antenna with Φ equal to 90 ° when f is equal to 2GHz in an embodiment of the present invention.
Fig. 10 shows a far field pattern of a dual-slot symmetric excited differential duplex filtering antenna with Φ equal to 90 ° at f equal to 2.45GHz according to an embodiment of the present invention.
In the figure, an upper dielectric substrate 1, a lower dielectric substrate 2, a metal floor 3, a rectangular metal radiation patch 4, a first metal feed microstrip line 5, a coupling slot 6, a metal microstrip resonator 7, a first metal open-ended resonant ring 8, a second metal open-ended resonant ring 9, a third metal open-ended resonant ring piece 10, a fourth metal open-ended resonant ring 11, and a second metal feed microstrip line 12.
Detailed Description
Specific embodiments of the present invention will be described in further detail with reference to the following examples and drawings, but the present invention is not limited thereto.
Example (b):
as shown in fig. 1 and fig. 2, a dual-slot symmetric excitation differential duplex filtering antenna includes an upper dielectric substrate 1, a lower dielectric substrate 2, a metal floor 3, a first metal feed microstrip line 5, a second metal feed microstrip line 12, a metal rectangular radiation patch 4, a coupling slot 6, a metal microstrip resonator 7, a first metal microstrip open-ended resonant ring 8, a second metal microstrip open-ended resonant ring 9, a third metal microstrip open-ended resonant ring 10, and a fourth metal microstrip open-ended resonant ring 11;
the upper-layer dielectric substrate 1, the metal floor 3 and the lower-layer dielectric substrate 2 are bonded together, and the metal floor 3 is embedded between the upper-layer dielectric substrate 1 and the lower-layer dielectric substrate 2; two coupling gaps 6 which are arranged in parallel are carved on the metal floor 3;
the metal rectangular radiation patch 4 is attached to the upper surface of the upper-layer dielectric substrate 1, the center of the metal rectangular radiation patch 4 is superposed with the center of the upper-layer dielectric substrate 1, the length of the metal rectangular radiation patch is one half of the waveguide wavelength, and the width of the metal rectangular radiation patch is larger than the distance between the two coupling gaps 6;
a first metal feed microstrip line 5, a second metal feed microstrip line 12, a metal microstrip resonator 7, a first metal microstrip open resonant ring 8, a second metal microstrip open resonant ring 9, a third metal microstrip open resonant ring 10 and a fourth metal microstrip open resonant ring 11 are attached to the lower surface of the lower-layer dielectric substrate 2; a second metal microstrip open-ended resonant ring 9, a first metal microstrip open-ended resonant ring 8, a third metal microstrip open-ended resonant ring 10 and a fourth metal microstrip open-ended resonant ring 11 are sequentially arranged from one side to the other side of the lower surface of the lower-layer dielectric substrate 2 along the central axis of the lower-layer dielectric substrate; the metal microstrip resonator 7 passes through the center of the lower surface of the lower dielectric substrate 2 and is positioned between the first metal microstrip open-ended resonant ring 8 and the third metal microstrip open-ended resonant ring 10; the first metal feed microstrip line 5 and the second metal feed microstrip line 12 are respectively connected with the second metal microstrip open resonator ring 9 and the fourth metal microstrip open resonator ring 11.
The upper-layer dielectric substrate 1, the lower-layer dielectric substrate 2, the metal floor 3, the metal rectangular radiation patch 4, the coupling slot 6, the metal microstrip resonator 7, the first metal microstrip open-ended resonant ring 8, the second metal microstrip open-ended resonant ring 9, the third metal microstrip open-ended resonant ring 10 and the fourth metal microstrip open-ended resonant ring 11 are all of symmetrical structures, and the symmetrical surfaces are overlapped.
Two coupling gaps 6 are symmetrically distributed on two sides of a common symmetrical plane of an upper-layer dielectric substrate 1, a lower-layer dielectric substrate 2, a metal floor 3, a metal rectangular radiation patch 4, a metal microstrip resonator 7, a first metal microstrip open resonator ring 8, a second metal microstrip open resonator ring 9, a third metal microstrip open resonator ring 10 and a fourth metal microstrip open resonator ring 11. The distance between the two coupling gaps 6 is larger than the widths of the first metal microstrip open resonance ring 8, the second metal microstrip open resonance ring 9, the third metal microstrip open resonance ring 10 and the fourth metal microstrip open resonance ring 11, and is shorter than the length of the metal microstrip resonator 7.
As shown in fig. 4, the metal microstrip resonator 7 is a metal strip passing through the center of the lower surface of the lower dielectric substrate 2, and is perpendicular to the common symmetry plane of the upper dielectric substrate 1, the lower dielectric substrate 2, the metal floor 3, the metal rectangular radiation patch 4, the coupling slot 6, the first metal microstrip open resonator ring 8, the second metal microstrip open resonator ring 9, the third metal microstrip open resonator ring 10, and the fourth metal microstrip open resonator ring 11.
The first metal microstrip open-ended resonant ring 8, the second metal microstrip open-ended resonant ring 9, the third metal microstrip open-ended resonant ring 10 and the fourth metal microstrip open-ended resonant ring 11 are all rectangular rings surrounded by microstrip lines, and an opening is formed in the middle of one edge of each rectangular ring.
The first metal microstrip open-ended resonant ring 8 and the third metal microstrip open-ended resonant ring 10 are respectively distributed on two sides of the metal microstrip resonator 7, and the side of the rectangular ring parallel to the side with the opening is close to the metal microstrip resonator 7 and parallel to the metal microstrip resonator 7;
the edge with the opening in the second metal microstrip open-ended resonant ring 9 is close to and parallel to the edge with the opening in the first metal microstrip open-ended resonant ring 8; the edge with the opening in the fourth metal microstrip open resonator ring 11 is close to and parallel to the edge with the opening in the third metal microstrip open resonator ring 10.
The second metal microstrip open resonator ring 9 feeds through the first metal feed microstrip line 5; the fourth metal microstrip open resonator ring 11 feeds through a second metal feeding microstrip line 12;
one end of the first metal feed microstrip line 5 can be connected to any edge of the second metal microstrip open-ended resonant ring 9, and the other end is connected with a feed signal source; one end of the second metal feed microstrip line 12 may be connected to any one edge of the fourth metal microstrip open-ended resonant ring 11, and the other end is connected to a feed signal source.
As shown in FIGS. 3 and 4, in this embodiment, the upper and lower dielectric substrates are both Rogers4003c, the relative dielectric constant is 3.55, and the thickness h of the two plates is1And h25mm and 0.5mm, respectively, and the remaining parameters l and l1、l2、l3、l4、l5、l6、l7、l8、l9、l10、ls、w、w1、w2、ws、s1、s2、 s3、s480mm, 40mm, 8mm, 12.225mm, 0.125mm, 11.5mm, 32mm, 11mm, 2mm, 9.6mm, 0.5mm, 20mm, 80mm, 29mm, 1.1mm, 0.8mm, 0.28mm, 1mm, 0.3mm, respectively; the size of the whole antenna is 80X 5.5mm3
The upper-layer dielectric substrate 1, the metal floor 3 and the metal rectangular radiation patch 4 form a microstrip antenna, the metal microstrip resonator 7 is mutually coupled with the microstrip antenna through a coupling slot 6 to form a dual-frequency antenna, and the dual-frequency antenna respectively resonates at two working frequencies, namely a transmitting frequency and a receiving frequency; because the symmetry of the structure, namely the upper dielectric substrate 1, the metal floor 3, the metal rectangular radiation patch 4, the metal microstrip resonator 7 and the coupling slot 6 have a common symmetry plane, the field distribution on the dual-frequency antenna is symmetrical about the symmetry plane on the transmission frequency and the receiving frequency to form a dual-frequency differential antenna, so that the radiation lobes are symmetrical and have the inhibiting effect on cross polarization.
The metal microstrip resonator 7 simultaneously plays a role of synthesizing two paths of signals, thereby forming a duplex antenna; the first metal microstrip open-ended resonant ring 8 and the second metal microstrip open-ended resonant ring 9 resonate at a resonant frequency of the dual-frequency antenna, a filter of one channel is formed by the first metal microstrip open-ended resonant ring and the resonant mode of the dual-frequency antenna, the third metal microstrip open-ended resonant ring 10 and the fourth metal microstrip open-ended resonant ring 11 resonate at another resonant frequency of the dual-frequency antenna, the resonant mode of the dual-frequency antenna forms a filter of another channel, and the two channels of the dual-frequency antenna have filtering characteristics, so that a filtering antenna is formed; because the first metal microstrip open resonator ring 8, the second metal microstrip open resonator ring 9, the third metal microstrip open resonator ring 10 and the fourth metal microstrip open resonator ring 11 have symmetrical structures and have the same symmetrical plane with the dual-frequency antenna, the two channel filters are both differential filters, so that the differential excitation of the dual-frequency antenna is ensured, and the good cross polarization performance and the symmetry of a radiation lobe are ensured; the first metal feed microstrip line 5 and the second metal feed microstrip line 12 respectively perform single-end excitation on the split resonant rings 9 and 11, so that the split resonant rings 9 and 11 simultaneously have a balun function.
The dual-frequency antenna is not only a radiation unit, but also a duplex synthesis unit, and is also a frequency-selecting resonance unit of the channel filter, so that the utility model has compact structure.
The signal of one channel carries out differential feed on the dual-frequency antenna through the first metal feed microstrip line 5, the second metal microstrip open-ended resonant ring 9 and the first metal microstrip open-ended resonant ring 8, the radiation is carried out through the metal rectangular radiation patch 4, and due to the inhibition effect of another channel filter formed by the third metal microstrip open-ended resonant ring 10 and the fourth metal microstrip open-ended resonant ring 11, the signal cannot leak to the channel connected with the second metal feed microstrip line 12, so that the isolation of the channel is realized;
the signal of the other channel is differentially fed to the dual-frequency antenna through the second metal feed microstrip line 12, the fourth metal microstrip open-ended resonant ring 11 and the third metal microstrip open-ended resonant ring 10, and is radiated through the metal rectangular radiation patch 4, and due to the suppression effect of the channel filter formed by the second metal microstrip open-ended resonant ring 9 and the first metal microstrip open-ended resonant ring 8, the signal cannot be leaked to the channel connected with the first metal feed microstrip line 5, so that the channel isolation is realized.
In this embodiment, the operating center frequencies of the antenna are respectively 2GHz and 2.45GHz, the bandwidths are respectively 102MHz and 129MHz, the S parameter of the antenna is as shown in fig. 5, and the antenna has a wider bandwidth. In both operating bands, the maximum gain of the antenna is 5.26dBi and 6.36dBi at the center of the vertical antenna, the gain of the antenna in the z-axis direction versus frequency is plotted as shown in fig. 6, the cross-polarizations are 40dBi and 42dBi, respectively, and the antenna has a lower cross-polarization. The patterns of the plane xoz of the antenna phi 0 deg. at f 2GHz and 2.45GH are shown in fig. 7 and 8; the directional diagram of the yoz plane of the 90 ° plane when the antenna is at f 2GHz and f 2.45GH is shown in fig. 9 and 10; the antenna has the characteristic of radiation symmetry.
It can be seen from the above description that the dual-slot symmetric excited differential duplex filtering antenna of the present invention has high integration level and small size, does not need additional matching network and has good bandwidth broadening of the band-pass filter; because the antenna adopts a symmetrical dual-port input structure, symmetrical radiation and low cross polarization can be realized.
The above embodiments are preferred embodiments of the present invention, but the embodiments of the present invention are not limited to the above embodiments, and any other changes, modifications, substitutions, combinations, and simplifications which do not depart from the spirit and principle of the present invention should be equivalent replacement modes, and all are included in the scope of the present invention.

Claims (10)

1.一种双槽对称激励的差分双工滤波天线,其特征在于,包括上层介质基板(1)、下层介质基板(2)、金属地板(3)、第一金属馈电微带线(5)、第二金属馈电微带线(12)、金属矩形辐射贴片(4)、耦合缝隙(6)、金属微带谐振器(7)、以及第一金属微带开口谐振环(8)、第二金属微带开口谐振环(9)、第三金属微带开口谐振环(10)、第四金属微带开口谐振环(11);1. A differential duplex filter antenna with dual-slot symmetrical excitation, characterized in that it comprises an upper dielectric substrate (1), a lower dielectric substrate (2), a metal floor (3), a first metal feeding microstrip line (5) ), a second metal feeding microstrip line (12), a metal rectangular radiating patch (4), a coupling slot (6), a metal microstrip resonator (7), and a first metal microstrip split resonator ring (8) , a second metal microstrip split resonator ring (9), a third metal microstrip split resonator ring (10), and a fourth metal microstrip split resonator ring (11); 上层介质基板(1)、金属地板(3)和下层介质基板(2)粘合在一起,金属地板(3)嵌在上层介质基板(1)和下层介质基板(2)之间;金属地板(3)上面刻有两条平行放置的耦合缝隙(6);The upper dielectric substrate (1), the metal floor (3) and the lower dielectric substrate (2) are bonded together, and the metal floor (3) is embedded between the upper dielectric substrate (1) and the lower dielectric substrate (2); the metal floor ( 3) Two parallel coupling slots (6) are engraved on it; 金属矩形辐射贴片(4)贴在上层介质基板(1)的上表面,且金属矩形辐射贴片(4)的中心与上层介质基板(1)中心重合,其长度为波导波长的二分之一,其宽度要大于两条耦合缝隙(6)之间的距离;The metal rectangular radiation patch (4) is attached to the upper surface of the upper dielectric substrate (1), and the center of the metal rectangular radiation patch (4) coincides with the center of the upper dielectric substrate (1), and its length is half the wavelength of the waveguide First, its width should be greater than the distance between the two coupling gaps (6); 第一金属馈电微带线(5)、第二金属馈电微带线(12)、金属微带谐振器(7)和第一金属微带开口谐振环(8)、第二金属微带开口谐振环(9)、第三金属微带开口谐振环(10)、第四金属微带开口谐振环(11)贴在下层介质基板(2)的下表面;其中,从沿下层介质基板(2)的中轴线从其下表面的一侧到另一侧依次排列为第二金属微带开口谐振环(9)、第一金属微带开口谐振环(8)、第三金属微带开口谐振环(10)、第四金属微带开口谐振环(11);金属微带谐振器(7)通过下层介质基板(2)下表面的中心,位于第一金属微带开口谐振环(8)以及第三金属微带开口谐振环(10)中间;第一金属馈电微带线(5)和第二金属馈电微带线(12)分别与第二金属微带开口谐振环(9)和第四金属微带开口谐振环(11)连接。A first metal feeding microstrip line (5), a second metal feeding microstrip line (12), a metal microstrip resonator (7), a first metal microstrip split resonator ring (8), a second metal microstrip The split resonator (9), the third metal microstrip split resonator (10), and the fourth metal microstrip split resonator (11) are attached to the lower surface of the lower dielectric substrate (2); 2) The central axis of the lower surface is sequentially arranged as a second metal microstrip split resonator (9), a first metal microstrip split resonator (8), and a third metal microstrip split resonator a ring (10), a fourth metal microstrip split resonator ring (11); the metal microstrip resonator (7) passes through the center of the lower surface of the lower dielectric substrate (2), and is located in the first metal microstrip split resonator ring (8) and The middle of the third metal microstrip split resonator ring (10); the first metal feeding microstrip line (5) and the second metal feeding microstrip line (12) are respectively connected to the second metal microstrip split resonator ring (9) and The fourth metal microstrip split resonator ring (11) is connected. 2.根据权利要求1所述的一种双槽对称激励的差分双工滤波天线,其特征在于,所述上层介质基板(1)、下层介质基板(2)、金属地板(3)、金属矩形辐射贴片(4)、耦合缝隙(6)、金属微带谐振器(7),以及第一金属微带开口谐振环(8)、第二金属微带开口谐振环(9)、第三金属微带开口谐振环(10)、第四金属微带开口谐振环(11)均具有对称结构,且对称面重合。2 . The differential duplex filter antenna with dual-slot symmetrical excitation according to claim 1 , wherein the upper dielectric substrate ( 1 ), the lower dielectric substrate ( 2 ), the metal floor ( 3 ), the metal rectangular A radiation patch (4), a coupling slot (6), a metal microstrip resonator (7), and a first metal microstrip split resonator (8), a second metal microstrip split resonator (9), a third metal microstrip split resonator The microstrip split resonator ring (10) and the fourth metal microstrip split resonator ring (11) both have symmetrical structures, and the symmetry planes are coincident. 3.根据权利要求1所述的一种双槽对称激励的差分双工滤波天线,其特征在于,两条耦合缝隙(6)对称分布在上层介质基板(1)、下层介质基板(2)、金属地板(3)、金属矩形辐射贴片(4)、金属微带谐振器(7)、以及第一金属微带开口谐振环(8)、第二金属微带开口谐振环(9)、第三金属微带开口谐振环(10)、第四金属微带开口谐振环(11)的公共对称面的两边;3. The differential duplex filter antenna with dual-slot symmetrical excitation according to claim 1, wherein the two coupling slots (6) are symmetrically distributed on the upper dielectric substrate (1), the lower dielectric substrate (2), A metal floor (3), a metal rectangular radiating patch (4), a metal microstrip resonator (7), and a first metal microstrip split resonator ring (8), a second metal microstrip split resonator ring (9), Two sides of the common symmetry plane of the three metal microstrip split resonator rings (10) and the fourth metal microstrip split resonator ring (11); 两条耦合缝隙(6)之间的距离比第一金属微带开口谐振环(8)、第二金属微带开口谐振环(9)、第三金属微带开口谐振环(10)、第四金属微带开口谐振环(11)的宽度要大,且比金属微带谐振器(7)的长度要短。The distance between the two coupling slots (6) is larger than that of the first metal microstrip split resonator (8), the second metal microstrip split resonator (9), the third metal microstrip split resonator (10), and the fourth metal microstrip split resonator (10). The width of the metal microstrip split resonator ring (11) is larger and shorter than the length of the metal microstrip resonator (7). 4.根据权利要求1所述的一种双槽对称激励的差分双工滤波天线,其特征在于,所述金属微带谐振器(7)是一条通过下层介质基板(2)下表面的中心的金属带,而且垂直于上层介质基板(1)、下层介质基板(2)、金属地板(3)、金属矩形辐射贴片(4)、耦合缝隙(6)、以及第一金属微带开口谐振环(8)、第二金属微带开口谐振环(9)、第三金属微带开口谐振环(10)、第四金属微带开口谐振环(11)的公共对称面。4 . The differential duplex filter antenna with dual-slot symmetrical excitation according to claim 1 , wherein the metal microstrip resonator ( 7 ) is a strip passing through the center of the lower surface of the lower dielectric substrate ( 2 ). 5 . The metal strip is perpendicular to the upper dielectric substrate (1), the lower dielectric substrate (2), the metal floor (3), the metal rectangular radiating patch (4), the coupling slot (6), and the first metal microstrip split resonator ring (8) The common symmetry plane of the second metal microstrip split resonator ring (9), the third metal microstrip split resonator ring (10), and the fourth metal microstrip split resonator ring (11). 5.根据权利要求1所述的一种双槽对称激励的差分双工滤波天线,其特征在于,所述第一金属微带开口谐振环(8)、第二金属微带开口谐振环(9)、第三金属微带开口谐振环(10)、第四金属微带开口谐振环(11)均为由微带线围起的一个矩形环,并在矩形环的一条边的中间有一个开口。The differential duplex filter antenna with dual-slot symmetrical excitation according to claim 1, wherein the first metal microstrip split resonator ring (8) and the second metal microstrip split resonator ring (9) ), the third metal microstrip split resonator ring (10), and the fourth metal microstrip split resonator ring (11) are all a rectangular ring surrounded by microstrip lines, and there is an opening in the middle of one side of the rectangular ring . 6.根据权利要求5所述的一种双槽对称激励的差分双工滤波天线,其特征在于,所述第一金属微带开口谐振环(8)以及第三金属微带开口谐振环(10)分别分布在金属微带谐振器(7)的两边,而且矩形环中与有开口的边相平行的边靠近金属微带谐振器(7)并与金属微带谐振器(7)平行;The differential duplex filter antenna with dual-slot symmetrical excitation according to claim 5, characterized in that the first metal microstrip split resonator ring (8) and the third metal microstrip split resonator ring (10) ) are respectively distributed on both sides of the metal microstrip resonator (7), and the side of the rectangular ring that is parallel to the side with the opening is close to the metal microstrip resonator (7) and parallel to the metal microstrip resonator (7); 所述第二金属微带开口谐振环(9)中有开口的边靠近并平行于第一金属微带开口谐振环(8)中的有开口的边;所述第四金属微带开口谐振环(11)中有开口的边靠近并平行于第三金属微带开口谐振环(10)中的有开口的边。The edge with the opening in the second metal microstrip split resonator ring (9) is close to and parallel to the edge with the opening in the first metal microstrip split resonator ring (8); the fourth metal microstrip split resonator ring The side with openings in (11) is close to and parallel to the side with openings in the third metal microstrip slit resonator ring (10). 7.根据权利要求1所述的一种双槽对称激励的差分双工滤波天线,其特征在于,第二金属微带开口谐振环(9)通过第一金属馈电微带线(5)进行馈电;第四金属微带开口谐振环(11)通过第二金属馈电微带线(12)进行馈电;7. A differential duplex filter antenna with dual-slot symmetrical excitation according to claim 1, characterized in that the second metal microstrip split resonator ring (9) is performed by the first metal feeding microstrip line (5). feeding; the fourth metal microstrip split resonator ring (11) is fed through the second metal feeding microstrip line (12); 所述第一金属馈电微带线(5)的一端可以连接在第二金属微带开口谐振环(9)的任意一条边上,另一端接一个馈电信号源;所述第二金属馈电微带线(12)的一端可以连接在第四金属微带开口谐振环(11)的任意一条边上,另一端接一个馈电信号源。One end of the first metal feeding microstrip line (5) can be connected to any side of the second metal microstrip split resonator ring (9), and the other end is connected to a feeding signal source; the second metal feeding One end of the electric microstrip line (12) can be connected to any side of the fourth metal microstrip split resonant ring (11), and the other end is connected to a feed signal source. 8.根据权利要求1所述的一种双槽对称激励的差分双工滤波天线,其特征在于,所述上层介质基板(1)、金属地板(3)、金属矩形辐射贴片(4)构成一个微带天线,金属微带谐振器(7)通过耦合缝隙(6)与微带天线互相耦合,构成双频天线,分别谐振在两个工作频率即发送频率和接收频率;由于结构的对称性即上层介质基板(1)、金属地板(3)、金属矩形辐射贴片(4)、金属微带谐振器(7)、耦合缝隙(6)有共同的对称面,在发送频率和接收频率上,双频天线上的场分布关于对称面对称,形成一个双频差分天线,因此辐射的波瓣对称,而且对交叉极化具有抑制作用。8 . The differential duplex filter antenna with dual-slot symmetrical excitation according to claim 1 , wherein the upper dielectric substrate ( 1 ), a metal floor ( 3 ), and a metal rectangular radiation patch ( 4 ) are composed of 8 . A microstrip antenna, the metal microstrip resonator (7) is coupled with the microstrip antenna through the coupling slot (6) to form a dual-frequency antenna, which resonates at two operating frequencies, namely the transmit frequency and the receive frequency; due to the symmetry of the structure That is, the upper dielectric substrate (1), the metal floor (3), the metal rectangular radiation patch (4), the metal microstrip resonator (7), and the coupling slot (6) have a common symmetry plane, and the transmission frequency and the reception frequency , the field distribution on the dual-frequency antenna is symmetrical about the symmetry plane, forming a dual-frequency differential antenna, so the radiated lobes are symmetrical, and it has a suppressing effect on cross-polarization. 9.根据权利要求1所述的一种双槽对称激励的差分双工滤波天线,其特征在于,金属微带谐振器(7)同时起到合成两路信号的作用,从而构成双工天线;第一金属微带开口谐振环(8)、第二金属微带开口谐振环(9)谐振在双频天线的一个谐振频率上,与双频天线的这个谐振模式构成一个通道的滤波器,第三金属微带开口谐振环(10)、第四金属微带开口谐振环(11)谐振在双频天线的另一个谐振频率,双频天线这个谐振模式构成另一个通道的滤波器,使双工天线的两个通道都具有滤波特性,从而构成滤波天线;由于第一金属微带开口谐振环(8)、第二金属微带开口谐振环(9)、第三金属微带开口谐振环(10)、第四金属微带开口谐振环(11)都具有对称结构,且与双频天线具有相同的对称面,因此两个通道滤波器都是差分滤波器,保证了双频天线的差分激励,从而保证了良好的交叉极化性能和辐射波瓣的对称性;第一金属馈电微带线(5)和第二金属馈电微带线(12)分别对第二金属微带开口谐振环(9)和第四金属微带开口谐振环(11)进行单端激励,因此第二金属微带开口谐振环(9)和第四金属微带开口谐振环(11)同时具有平衡-不平衡变换的功能。9 . The differential duplex filter antenna with dual-slot symmetrical excitation according to claim 1 , wherein the metal microstrip resonator ( 7 ) simultaneously plays the role of synthesizing two signals, thereby forming a duplex antenna; 10 . The first metal microstrip split resonator ring (8) and the second metal microstrip split resonator ring (9) resonate at a resonant frequency of the dual-frequency antenna, and form a channel filter with this resonant mode of the dual-frequency antenna. The three metal microstrip split resonator rings (10) and the fourth metal microstrip split resonator ring (11) resonate at another resonant frequency of the dual-frequency antenna. Both channels of the antenna have filtering characteristics, thereby forming a filtering antenna; since the first metal microstrip split resonator (8), the second metal microstrip split resonator (9), and the third metal microstrip split resonator (10) ) and the fourth metal microstrip split resonator ring (11) all have a symmetrical structure and have the same symmetry plane as the dual-band antenna, so the two channel filters are differential filters, which ensures the differential excitation of the dual-band antenna. Thereby, good cross-polarization performance and symmetry of radiation lobes are ensured; (9) and the fourth metal microstrip split resonator (11) perform single-ended excitation, so the second metal microstrip split resonator (9) and the fourth metal microstrip split resonator (11) have both balanced-unbalanced Transform function. 10.根据权利要求9所述的一种双槽对称激励的差分双工滤波天线,其特征在于,一个通道的信号通过第一金属馈电微带线(5)、第二金属微带开口谐振环(9)、第一金属微带开口谐振环(8)对双频天线进行差分馈电,通过金属矩形辐射贴片(4)辐射,由于第三金属微带开口谐振环(10)、第四金属微带开口谐振环(11)构成的另一个通道滤波器的抑制作用,信号无法泄露到第二金属馈电微带线(12)所连接的通道,实现了通道的隔离;The differential duplex filter antenna with dual-slot symmetrical excitation according to claim 9, characterized in that the signal of one channel resonates through the first metal feeding microstrip line (5) and the second metal microstrip opening The ring (9) and the first metal microstrip split resonator ring (8) differentially feed the dual-frequency antenna and radiate through the metal rectangular radiating patch (4). The suppressing effect of another channel filter formed by the four metal microstrip split resonator ring (11) prevents the signal from leaking to the channel connected to the second metal feeding microstrip line (12), thus realizing the isolation of the channel; 另一个通道的信号通过第二金属馈电微带线(12)、第四金属微带开口谐振环(11)、第三金属微带开口谐振环(10)对双频天线进行差分馈电,通过金属矩形辐射贴片(4)辐射,由于第二金属微带开口谐振环(9)、第一金属微带开口谐振环(8)构成的通道滤波器的抑制作用,信号无法泄露到第一金属馈电微带线(5)所连接的通道,实现了通道的隔离。The signal of the other channel is differentially fed to the dual-frequency antenna through the second metal feeding microstrip line (12), the fourth metal microstrip split resonator ring (11), and the third metal microstrip split resonator ring (10). Radiated through the metal rectangular radiation patch (4), due to the suppression effect of the channel filter formed by the second metal microstrip split resonator (9) and the first metal microstrip split resonator (8), the signal cannot leak to the first metal microstrip split resonator (8). The channel connected to the metal feeding microstrip line (5) realizes the isolation of the channel.
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Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN110931972A (en) * 2019-12-27 2020-03-27 华南理工大学 Double-slot symmetrically excited differential duplex filtering antenna
CN113161736A (en) * 2021-04-02 2021-07-23 曲阜师范大学 Double-frequency circularly polarized dielectric resonator antenna
CN114284726A (en) * 2021-12-06 2022-04-05 重庆邮电大学 High-port isolation filter antenna unit applied to dual-frequency dual-circular polarization and rotating antenna array composed of the unit

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN110931972A (en) * 2019-12-27 2020-03-27 华南理工大学 Double-slot symmetrically excited differential duplex filtering antenna
CN113161736A (en) * 2021-04-02 2021-07-23 曲阜师范大学 Double-frequency circularly polarized dielectric resonator antenna
CN114284726A (en) * 2021-12-06 2022-04-05 重庆邮电大学 High-port isolation filter antenna unit applied to dual-frequency dual-circular polarization and rotating antenna array composed of the unit

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