CN107369899B - Filtering antenna array based on multi-mode resonator - Google Patents
Filtering antenna array based on multi-mode resonator Download PDFInfo
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- CN107369899B CN107369899B CN201710585786.1A CN201710585786A CN107369899B CN 107369899 B CN107369899 B CN 107369899B CN 201710585786 A CN201710585786 A CN 201710585786A CN 107369899 B CN107369899 B CN 107369899B
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01Q—ANTENNAS, i.e. RADIO AERIALS
- H01Q23/00—Antennas with active circuits or circuit elements integrated within them or attached to them
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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
- H01Q1/50—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
- H01Q21/00—Antenna arrays or systems
Abstract
The invention discloses a multi-mode resonator based filter antenna array, which comprises four identical symmetrically-placed double-layer stacked microstrip patch antennas and a one-to-four power distribution network, wherein each double-layer stacked microstrip patch antenna comprises a first microstrip patch antenna and a second microstrip patch antenna, and the one-to-four power distribution network comprises an impedance transformation microstrip line, an opposite phase power distribution microstrip line, a tap coupling microstrip line, a branch-loaded dual-mode resonator and an in-phase power distribution T-shaped microstrip line. The invention designs a filtering power distribution network with filtering and power distribution functions, and the double-layer stacked microstrip patch antenna is used as the last stage of the filtering network, so that the filtering order is improved, and meanwhile, the edge selectivity is improved. Meanwhile, the antenna has the advantages of compact structure, high gain and good filtering characteristic.
Description
Technical Field
The invention relates to the technical field of mobile communication, in particular to a multi-mode resonator based filter antenna array.
Background
The antenna feeder system is the foremost end of the wireless communication system and is an indispensable key component of the wireless communication system. The antenna feed system comprises an antenna, a filter and a duplexer, and the traditional method is that the antenna, the filter and the duplexer are designed independently and then connected by a radio frequency cable. The three are matched with a 50 ohm feeder line through an independent matching network, so that the problems of large size and heavy total weight are caused, and meanwhile, the defect of large loss is caused by excessive matching networks.
With the development of wireless communication, the communication system tends to be more miniaturized and integrated, and therefore, an integrated antenna feeder system has a great demand. The filtering antenna jointly designs the antenna and the filter, so that the structure of the radio frequency front-end system is more compact, unnecessary loss is reduced, and the miniaturization and integration of the communication system are easier to realize.
In the prior art, the design of the filtering antenna is mainly to design the antenna and the filter in cascade, and the impedance of the connection port between the antenna and the filter is not designed to be 50 ohms any more, but is designed to be an optimal impedance. The bandwidth of the antenna is wider than that of the filter, and the filter is used for filtering out the required frequency band. Such a design may cause deterioration of edge frequency selectivity, which is disadvantageous for communication.
Therefore, the integrated design of the filter antenna and the filter network are also power distribution networks, and it is necessary to design the antenna radiation unit as the last stage of the filter to improve the frequency selectivity and expand the bandwidth.
Disclosure of Invention
The invention aims to solve the defects in the prior art and provides a filter antenna array based on a multi-mode resonator.
The purpose of the invention can be achieved by adopting the following technical scheme:
a filtering antenna array based on a multimode resonator comprises an upper-layer dielectric substrate 9 and a lower-layer dielectric substrate 10, wherein the upper surface of the upper-layer dielectric substrate 9 is printed with four identical first microstrip patch antennas 1 which are symmetrically arranged, the upper surface of the lower-layer dielectric substrate 10 is printed with four identical second microstrip patch antennas 2 which are symmetrically arranged and a power distribution network 3 with a one-to-four filtering function, the lower surface of the upper-layer dielectric substrate is printed with a reflection floor 11, the first microstrip patch antennas 1 and the second microstrip patch antennas 2 are stacked up and down to form a double-layer stacked microstrip patch antenna, the first microstrip patch antennas 1 are parasitic patches, the second microstrip patch antennas 2 are driving patches, the first microstrip patch antennas 1 comprise first parasitic patches 12, second parasitic patches 13, third parasitic patches 14 and fourth parasitic patches 15, and the second microstrip patch antennas 2 comprise first driving patches 16, second driving patches 17, third driving patches 18 and fourth driving patches 19;
one end of the power distribution network 3 with the four-in-one filtering function is connected with the port, and the other end of the power distribution network is connected with the second microstrip patch antenna 2.
Furthermore, the one-to-four power distribution network 3 with the filtering function comprises a first impedance transformation line 7, a second impedance transformation line 30, a third impedance transformation line 31, a fourth impedance transformation line 32, an opposite-phase power distribution microstrip line 4, a tap coupling microstrip line 8, a stub loaded dual-mode resonator 5 and an in-phase power distribution T-shaped microstrip line 6; the first impedance transformation line 7 comprises a fifth impedance transformation line 33, a sixth impedance transformation line 34, a seventh impedance transformation line 35 and an eighth impedance transformation line 36, the inverse power distribution microstrip line 4 comprises a first inverse power distribution microstrip line 22 and a second inverse power distribution microstrip line 23, the tap coupling microstrip line 8 comprises a first tap coupling microstrip line 28 and a second tap coupling microstrip line 29, and the stub-loaded dual-mode resonator 5 comprises a first dual-mode resonator 20 and a second dual-mode resonator 21, wherein the first dual-mode resonator comprises a U-shaped first open line 24 and a second open line 25 loaded on a groove section of the U-shaped first open line 24, and the second dual-mode resonator comprises a U-shaped third open line 26 and a fourth open line 27 loaded on a groove section of the U-shaped third open line 26.
Further, the first inverted-phase power distribution microstrip line 22 and the second inverted-phase power distribution microstrip line 23 are respectively connected to a fifth impedance transformation line 33, a seventh impedance transformation line 35, a sixth impedance transformation line 34 and an eighth impedance transformation line 36, one end of the first tap coupling microstrip line 28 and one end of the second tap coupling microstrip line 29 are respectively connected to the first inverted-phase power distribution microstrip line 22 and the second inverted-phase power distribution microstrip line 23, and the other end of the first tap coupling microstrip line 28 and the other end of the second tap coupling microstrip line 29 are respectively connected to the first open circuit line 24 of the first dual-mode resonator 20 and the third open circuit line 26 of the second dual-mode resonator 21;
a coupling gap exists between the first open line 24, the third open line 26 and the in-phase power distribution T-shaped microstrip line 6, the in-phase power distribution T-shaped microstrip line 6 is connected with one end of the second impedance transformation line 30, the other end of the second impedance transformation line 30 is connected with one end of the third impedance transformation line 31, the other end of the third impedance transformation line 31 is connected with one end of the fourth impedance transformation line 32, and the other end of the fourth impedance transformation line 32 is connected with an excitation port;
the in-phase power distribution T-shaped microstrip line 6 is disposed on one side of the first open line 24 and the third open line 26, a coupling gap exists between the in-phase power distribution T-shaped microstrip line 6 and the first open line 24 and the third open line 26, and the first dual-mode resonator 20 and the second dual-mode resonator 21 feed power through slot coupling with the in-phase power distribution T-shaped microstrip line 6; the first dual-mode resonator 20 and the second dual-mode resonator 21 further perform tap coupling feeding through the first tap coupling microstrip line 28 and the second tap coupling microstrip line 29, respectively.
Furthermore, one end of the one-to-two power distribution network 3 with filtering function is connected to the port through the fourth impedance transformation line 32, and the other end is connected to the first driving patch 16, the second driving patch 17, the third driving patch 18 and the fourth driving patch 19 through the fifth impedance transformation line 33, the sixth impedance transformation line 34, the seventh impedance transformation line 35 and the eighth impedance transformation line 36, respectively.
Further, the first tap coupling microstrip line 28 and the second tap coupling microstrip line 29 are respectively disposed at a quarter wavelength of the operating frequency from the midpoint of the first inverted power distribution microstrip line 22 and the second inverted power distribution microstrip line 23.
Further, the fifth impedance transformation line 33, the sixth impedance transformation line 34, the seventh impedance transformation line 35, and the eighth impedance transformation line 36 are respectively provided at the middle of the edges of the first driving patch 16, the second driving patch 17, the third driving patch 18, and the fourth driving patch 19.
Further, four identical symmetrically placed first microstrip patch antennas 1 printed on the upper surface of the upper dielectric substrate 9, four identical symmetrically placed second microstrip patch antennas 2 printed on the upper surface of the lower dielectric substrate 10, and the inverted-phase power distribution microstrip line 4 can generate a patch antenna array having three similar resonant modes.
Further, the filter antenna array generated by coupling the first dual-mode resonator 20, the second dual-mode resonator 21 and the patch antenna array with three similar resonant modes loaded on the branches can enable a required frequency signal to pass through.
Further, the first dual-mode resonator 20 and the second dual-mode resonator 21 loaded by the stubs can respectively generate a radiation zero point at two sides outside the passband.
Further, the first open line 24 of the first dual-mode resonator 20 loaded with stubs and the third open line 26 of the second dual-mode resonator 21 loaded with stubs generate a transmission zero at an upper stop band, the second open line 25 of the first dual-mode resonator 20 loaded with stubs and the fourth open line 27 of the second dual-mode resonator 21 loaded with stubs introduce a transmission zero at a lower stop band, and by adjusting the lengths of the first open line 24, the second open line 25, the third open line 26 and the fourth open line 27, the coupling gap between the in-phase power distribution T-type microstrip line 6 and the first open line 24 and the third open line 26, the position of the first tap coupling microstrip line 28 at the position of the first open line 24, and the position of the second tap coupling microstrip line 29 at the position of the third open line 26, a signal with a desired frequency can pass through.
Compared with the prior art, the invention has the following advantages and effects:
1. the invention combines the power distribution network of the array antenna with the filter network design, and designs a filter power distribution network which has both the filter function and the power distribution function. The structure of the antenna is compact. Meanwhile, the antenna array with four units is designed, so that the gain of the antenna is greatly improved.
2. The double-layer patch antenna unit is designed to be the last order of the filter, so that modes in a pass band are increased, the frequency selectivity is improved, and the bandwidth is expanded.
3. The invention takes the power distribution microstrip line as the first order of the filter network, improves the effectiveness of the structure and utilizes the structure to the maximum. Meanwhile, the order of the filter network is also improved, and the frequency selectivity is improved.
4. According to the invention, by designing the length of the SLR resonator and using a mode of direct feeding of one port, two transmission zeros are respectively introduced to two sides outside the band, so that out-of-band rejection is improved.
Drawings
FIG. 1 is a general schematic diagram of the present invention and the numbering of the major components;
FIG. 2 is a general schematic of the present invention and a refined numbering label;
FIG. 3 is a top view of a two-unit double stacked patch antenna of the present invention;
FIG. 4 is a top view of an upper dielectric substrate according to the present invention;
FIG. 5 is a top view of a lower dielectric substrate according to the present invention;
FIG. 6 is a dimension drawing of the upper surface structure of the middle and upper dielectric substrate according to the present invention;
FIG. 7 is a drawing of the dimensional indicia of the top surface features of the lower dielectric substrate of the present invention;
FIG. 8 is a simulated S-parameter plot of an example of a two-unit double-layer stacked patch antenna of the present invention;
FIG. 9 is a simulated S parameter plot of an example SLR resonator of the present invention;
FIG. 10 is a graph of S-parameters for the antenna of the present invention;
FIG. 11 is a graph of simulated gain versus frequency for an antenna of the present invention;
FIG. 12 is a simulated E-plane pattern of the antenna of the present invention;
fig. 13 is an H-plane simulated pattern of the antenna of the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, 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 some, but not all, embodiments of the present invention. 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.
Examples
Referring to fig. 1 and 2, in the present embodiment, a multi-mode resonator based filter antenna array is disclosed, in which four identical symmetrically-disposed first microstrip patch antennas 1 are printed on an upper surface of an upper dielectric substrate 9, four identical symmetrically-disposed second microstrip patch antennas 2 and a power distribution network 3 with a one-to-four filter function are printed on an upper surface of a lower dielectric substrate 10, and a reflective floor 11 is printed on a lower surface thereof.
First microstrip patch antenna 1 be the parasitic patch, second microstrip patch antenna 2 is the drive patch, first microstrip patch antenna 1 include first parasitic patch 12, second parasitic patch 13, third parasitic patch 14 and fourth parasitic patch 15, second microstrip patch antenna 2 include first drive patch 16, second drive patch 17, third drive patch 18 and fourth drive patch 19. Moreover, the first microstrip patch antenna 1 and the second microstrip patch antenna 2 are stacked up and down to form a double-layer stacked microstrip patch antenna,
the four-in-one power distribution network 3 with the filtering function comprises a first impedance transformation line 7, a second impedance transformation line 30, a third impedance transformation line 31, a fourth impedance transformation line 32, a reversed-phase power distribution microstrip line 4, a tap coupling microstrip line 8, a dual-mode resonator 5 loaded with minor matters and a same-phase power distribution T-shaped microstrip line 6; the first impedance transformation line 7 comprises a fifth impedance transformation line 33, a sixth impedance transformation line 34, a seventh impedance transformation line 35 and an eighth impedance transformation line 36, the inverse power distribution microstrip line 4 comprises a first inverse power distribution microstrip line 22 and a second inverse power distribution microstrip line 23, the tap coupling microstrip line 8 comprises a first tap coupling microstrip line 28 and a second tap coupling microstrip line 29, the stub-loaded dual-mode resonator 5 comprises a first dual-mode resonator 20 and a second dual-mode resonator 21, and the first dual-mode resonator and the second dual-mode resonator respectively comprise a U-shaped first open line 24, a second open line 25 and a U-shaped third open line 26 loaded on a U-shaped first open line groove section, and a fourth open line 27 loaded on a U-shaped third open line groove section.
One end of the power distribution network 3 with the four-in-one filtering function is connected with the port through a fourth impedance transformation line 32, and the other end is connected with the second microstrip patch antenna 2.
The structure of the filter antenna array is symmetrical, referring to fig. 3, a two-unit antenna array is formed by selecting a first driving patch 16, a third driving patch 18, a first parasitic patch 12, a third parasitic patch 14, a fifth impedance transformation line 33, a seventh impedance transformation line 35 and a first inverse power distribution microstrip line 22 from four-unit filter antenna arrays, and the first driving patch, the third parasitic patch, the first and third parasitic patches and the first inverse power distribution microstrip line can generate a patch antenna array with three similar resonance modes by reasonably selecting the size. As an example, when the center frequency is selected to be 2.65GHz, a Teflon dielectric substrate with a relative dielectric constant of 2.55, a dielectric loss angle of 0.003 and a thickness of 0.8mm is used. The lengths and the widths of the first driving patch and the third driving patch are both 33.8mm, the lengths and the widths of the first parasitic patch and the third parasitic patch are both 41.5mm, the lengths of the fifth impedance transformation microstrip line and the seventh impedance transformation microstrip line are both 10.8mm, the widths of the fifth impedance transformation microstrip line and the seventh impedance transformation microstrip line are both 4.6mm, the length of the first reversed-phase power distribution microstrip line is 46.2mm, the width of the first reversed-phase power distribution microstrip line is 1.2mm, the height of an air layer is 6.5mm, and excitation is carried out at a position 19.5mm away from the middle point of the first reversed-phase power distribution microstrip line. Fig. 8 shows the S-parameters at this time, and it can be seen that the resonance modes of the double-layer stacked microstrip patch antenna are similar to those of the inverted power distribution microstrip line.
The stub-loaded dual-mode resonator 5 includes a first dual-mode resonator 20 and a second dual-mode resonator 21, which are symmetrically identical. A first dual-mode resonator 20 was selected for study, consisting of a first open-path line 24 of the U-shape, a second open-path line 25 loaded in the groove section of the first open-path line of the U-shape. A coupling gap exists between one end of the first dual-mode resonator 20 and the in-phase power distribution T-shaped microstrip line 6, and the coupling gap feeds power by coupling, and the other end of the first dual-mode resonator is connected to the first tap coupling microstrip line 28, and through tap coupling power feeding, the first open line 24 of the first dual-mode resonator generates a transmission zero at the upper stop band, and the second open line 25 introduces a transmission zero at the lower stop band. By reasonably selecting the lengths of the first open line 24 and the second open line 25, the coupling distance of the slot coupling and the position of the tap coupling port, a signal with a desired frequency can pass through. As an example, when the center frequency is selected to be 2.65GHz, a Teflon dielectric substrate having a relative dielectric constant of 2.55, a dielectric loss angle of 0.003 and a thickness of 0.8mm is used, and the length of the first open line 24 is 36.2mm and the length of the second open line 25 is 23.2mm. Fig. 9 shows the S-parameters of the dual-mode resonator at this time, and it can be seen that there are two similar modes near the center frequency of 2.65GHz, and there is a zero point at each of 2.2GHz and 3.1GHz outside the band, so as to improve the out-of-band rejection.
During operation, signals are sent from the port, are transmitted to the same-phase power distribution T-shaped microstrip line 6 through the fourth impedance transformation line 32, the third impedance transformation line 31 and the second impedance transformation line 30, are then coupled to the first dual-mode resonator 20 and the second dual-mode resonator 21 through the gaps in the same amplitude and the same phase, are transmitted to the first reversed-phase power distribution microstrip line 22 and the second reversed-phase power distribution microstrip line 23 through the first tap coupling microstrip line 28 and the second tap coupling microstrip line 29 respectively, signals passing through the first reversed-phase power distribution microstrip line are distributed to the first driving patch 16 and the third driving patch 18 in the same amplitude and opposite phases (phase difference is 180 degrees), signals passing through the second reversed-phase power distribution microstrip line are distributed to the second driving patch 17 and the fourth driving patch 19 in the same amplitude and opposite phases (phase difference is 180 degrees), and finally energy of the driving patches is coupled to the parasitic patches. Because the currents on the parasitic patches are all in the same direction, the currents can be superposed in the positive Z direction of the antenna in the same direction, and high antenna gain is generated.
Fig. 4 and 5 are electrical structural diagrams of the upper and lower surfaces of two dielectric substrates, respectively, the stripe filling portion is a conductor copper-covered structure, and the rest is a dielectric substrate.
Fig. 6 and 7 are drawings showing the dimensions of the electrical structure of each part.
With reference to the size labels of fig. 2, fig. 6, and fig. 7, the specific parameters of the antenna in this embodiment are as follows: both dielectric sheets were polytetrafluoroethylene dielectric sheet sheets with a thickness 1c,3c of 0.8mm, a width 1b of 166mm, and a length 1a of 166mm. The height 2c between the two dielectric sheets is 6.5mm. The side lengths 2a and 2b of the parasitic patches are both 41.5mm, and the distances 4c and 5c are 42.5mm. The driver patches were 33.8mm on each side 3a,3b and 50.2mm spaced 6c,7 c. The power distribution network is left-right symmetrical, and the main sizes thereof are 4a,5a,6a,7a,8a,9a,10a, 111a, 12a,13a and 14a, and are respectively 10.8mm,8.6mm,5mm,17.3mm,7.1mm,13.6mm,23.2mm,17.8mm,19mm and 28mm.4b,5b,6b,7b,8b,9b,10b, 111b, 12b,13b and 14b are respectively 4.6mm,1.2mm,2.2mm,1mm,2mm,0.5mm,2.2mm,5.76mm,3.1mm,2.64mm and 2.2mm. The filter antenna array works at the center frequency of about 2.65GHz, the bandwidth is 460MHz, and five resonance modes are arranged in the band, as shown in figure 10. The gain of the antenna is substantially greater than 11dBi over the operating band, as shown in fig. 11. The cross polarization is greater than 30dB as shown by the simulated patterns of the antenna 12, 13.
The above embodiments are preferred embodiments of the present invention, but the present invention is 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 construed as equivalents thereof, and all such changes, modifications, substitutions, combinations, and simplifications are intended to be included in the scope of the present invention.
Claims (6)
1. A filtering antenna array based on a multimode resonator comprises an upper-layer dielectric substrate (9) and a lower-layer dielectric substrate (10), wherein the upper surface of the upper-layer dielectric substrate (9) is printed with four identical first microstrip patch antennas (1) which are symmetrically arranged, the upper surface of the lower-layer dielectric substrate (10) is printed with four identical second microstrip patch antennas (2) which are symmetrically arranged and a power distribution network (3) with a one-to-four filtering function, and the lower surface of the upper-layer dielectric substrate is printed with a reflection floor (11), and the filtering antenna array is characterized in that the first microstrip patch antenna (1) and the second microstrip patch antenna (2) are stacked up and down to form a double-layer stacked microstrip antenna, wherein the first microstrip patch antenna (1) is a parasitic patch, the second microstrip patch antenna (2) is a driving patch, the first microstrip patch antenna (1) comprises a first parasitic patch (12), a second parasitic patch (13), a third parasitic patch (14) and a fourth parasitic patch (15), and the second microstrip patch antenna (2) comprises a first parasitic patch (16), a second parasitic patch (16), a fourth parasitic patch (17) and a driving patch (17);
one end of the power distribution network (3) with the four-in-one filtering function is connected with the port, and the other end of the power distribution network is connected with the second microstrip patch antenna (2);
the power distribution network (3) with the one-to-four filtering function comprises a first impedance transformation line (7), a second impedance transformation line (30), a third impedance transformation line (31), a fourth impedance transformation line (32), a reversed-phase power distribution microstrip line (4), a tap coupling microstrip line (8), a dual-mode resonator (5) loaded by minor matters and a same-phase power distribution T-shaped microstrip line (6); the first impedance transformation line (7) comprises a fifth impedance transformation line (33), a sixth impedance transformation line (34), a seventh impedance transformation line (35) and an eighth impedance transformation line (36), the inverse power distribution microstrip line (4) comprises a first inverse power distribution microstrip line (22) and a second inverse power distribution microstrip line (23), the tap coupling microstrip line (8) comprises a first tap coupling microstrip line (28) and a second tap coupling microstrip line (29), the dual-mode resonator (5) loaded by the branches comprises a first dual-mode resonator (20) and a second dual-mode resonator (21), wherein the first dual-mode resonator comprises a first open line (24) of a U shape and a second open line (25) loaded in a groove section of the first open line (24) of the U shape, and the second dual-mode resonator comprises a third open line (26) of the U shape and a fourth open line (27) loaded in a groove section of the third open line (26) of the U shape;
the first reversed-phase power distribution microstrip line (22) and the second reversed-phase power distribution microstrip line (23) are respectively connected with a fifth impedance transformation line (33), a seventh impedance transformation line (35), a sixth impedance transformation line (34) and an eighth impedance transformation line (36), one end of the first tap coupling microstrip line (28) and one end of the second tap coupling microstrip line (29) are respectively connected with the first reversed-phase power distribution microstrip line (22) and the second reversed-phase power distribution microstrip line (23), and the other end of the first tap coupling microstrip line (28) and the other end of the second tap coupling microstrip line (29) are respectively connected with a first open route (24) of the first double-mode resonator (20) and a third open route (26) of the second double-mode resonator (21);
a coupling gap exists between the first open line (24), the third open line (26) and the in-phase power distribution T-shaped microstrip line (6), the in-phase power distribution T-shaped microstrip line (6) is connected with one end of the second impedance transformation line (30), the other end of the second impedance transformation line (30) is connected with one end of the third impedance transformation line (31), the other end of the third impedance transformation line (31) is connected with one end of the fourth impedance transformation line (32), and the other end of the fourth impedance transformation line (32) is connected with an excitation port;
the in-phase power distribution T-shaped microstrip line (6) is arranged on one side of the first open line (24) and the third open line (26), a coupling gap exists between the in-phase power distribution T-shaped microstrip line (6) and the first open line (24) and between the in-phase power distribution T-shaped microstrip line and the third open line (26), and the first dual-mode resonator (20) and the second dual-mode resonator (21) are coupled with the in-phase power distribution T-shaped microstrip line (6) through the gap for feeding; the first dual-mode resonator (20) and the second dual-mode resonator (21) are respectively subjected to tap coupling feeding through the first tap coupling microstrip line (28) and the second tap coupling microstrip line (29);
one end of the power distribution network (3) with the four-in-one filtering function is connected with a port through the fourth impedance transformation line (32), and the other end of the power distribution network is connected with the first driving patch (16), the second driving patch (17), the third driving patch (18) and the fourth driving patch (19) through the fifth impedance transformation line (33), the sixth impedance transformation line (34), the seventh impedance transformation line (35) and the eighth impedance transformation line (36) respectively;
the first tap coupling microstrip line (28) and the second tap coupling microstrip line (29) are respectively arranged at a quarter wavelength of the working frequency away from the middle point of the first reversed-phase power distribution microstrip line (22) and the second reversed-phase power distribution microstrip line (23).
2. The multi-mode resonator-based filter antenna array of claim 1, wherein the fifth impedance transformation line (33), the sixth impedance transformation line (34), the seventh impedance transformation line (35), and the eighth impedance transformation line (36) are respectively disposed at the middle of the edges of the first driving patch (16), the second driving patch (17), the third driving patch (18), and the fourth driving patch (19).
3. The multimode resonator-based filter antenna array according to claim 1, wherein four identical symmetrically placed first microstrip patch antennas (1) printed on the upper surface of said upper dielectric substrate (9) and four identical symmetrically placed second microstrip patch antennas (2) printed on the upper surface of said lower dielectric substrate (10) and said inverted power distribution microstrip line (4) are capable of generating a patch antenna array having three similar resonant modes.
4. A multi-mode resonator based filter antenna array according to claim 1, wherein said first dual-mode resonator (20), said second dual-mode resonator (21) and said patch antenna array having three similar resonant modes are coupled to produce a filter antenna array that passes a desired frequency signal.
5. The multimode resonator-based filter antenna array of claim 1, wherein the first dual-mode resonator (20) and the second dual-mode resonator (21) that are stub loaded are capable of generating a radiation null on each side outside the passband.
6. The multimode resonator-based filter antenna array according to claim 1, wherein the first open line (24) of the first dual-mode resonator (20) loaded with stubs and the third open line (26) of the second dual-mode resonator (21) loaded with stubs generate a transmission zero at an upper stop band, the second open line (25) of the first dual-mode resonator (20) loaded with stubs and the fourth open line (27) of the second dual-mode resonator (21) loaded with stubs introduce a transmission zero at a lower stop band, and the first tap coupling microstrip line (28) is located at the position of the first open line (24), the second open line (25), the third open line (26) and the fourth open line (27), the in-phase power distribution T-shaped microstrip line (6) and the coupling gap between the first open line (24) and the third open line (26), and the second tap coupling microstrip line (29) is located at the position of the third open line (26) so that a signal of a desired frequency can pass through the upper stop band.
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| CN108847865A (en) * | 2018-08-24 | 2018-11-20 | 南京濠暻通讯科技有限公司 | A kind of Anneta module for the 5th third-generation mobile communication mimo system |
| CN109301460A (en) * | 2018-10-31 | 2019-02-01 | 南通至晟微电子技术有限公司 | The double array antennas of 5G millimeter wave two-band |
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