CN118073840A - Small-size dual-frenquency band dual polarized wave filter antenna - Google Patents
Small-size dual-frenquency band dual polarized wave filter antenna Download PDFInfo
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Abstract
The invention discloses a small dual-band dual-polarized filter antenna, and relates to the field of antennas. Comprising the following steps: the antenna comprises a corner-cut rectangular patch, a microstrip structure, a monopole array and a coaxial feeder. The corner cut rectangular patch is arranged on the upper surface of the first substrate. The microstrip structure is arranged on the top of the second substrate as a coupling feed structure. The monopole arrays are embedded in the third substrate, and top loads are respectively distributed on the top of the third substrate. The coaxial feeder line vertically penetrates through the third substrate from the bottom of the third substrate, and the second substrate is connected with the microstrip structure. The small dual-band dual-polarized filter antenna realizes right-hand circular polarization radiation and omnidirectional linear polarization radiation, does not need any power divider or phase delay line, reduces design complexity and reduces insertion loss. The design of the defective ground structure increases the current path, thereby reducing the size of the antenna and widening the working frequency band of the antenna. The two-frequency-band communication is provided under the same aperture, and an additional filtering system is not required to be integrated, so that the occupied space is reduced.
Description
Technical Field
The invention relates to the field of antennas, in particular to a small dual-band dual-polarized filter antenna.
Background
With the accelerated development of 5G wireless communication, stable real-time information interaction between various wireless devices is of great importance, and a ground intelligent system is generally required to radiate omni-directional Linear Polarization (LP) waves, while satellite communication is generally required to radiate right-hand circular polarization (RHCP) waves, so that in order to accomplish these communication tasks, a plurality of different antennas are required to be installed in the system, and thus, the occupied space is inevitably increased.
And because antennas used in various operating scenarios interfere with each other, the wireless communication system needs to be integrated with a filtering system, which in turn further increases the antenna size. With the development of modern communication systems toward miniaturization and integration, a need has arisen to design a dual-polarized filter antenna capable of providing communication in two frequency bands under the same aperture.
Disclosure of Invention
The present invention has been made in view of the above problems, and it is an object of the present invention to provide a small dual band dual polarized filter antenna which overcomes or at least partially solves the above problems.
The embodiment of the invention provides a small dual-band dual-polarized filter antenna, which comprises: the antenna comprises a corner-cut rectangular patch, a microstrip structure, a monopole array and a coaxial feeder;
The corner-cut rectangular patch is arranged on the top surface of the first substrate and is used for receiving coupling feed of the microstrip structure, generating right-hand circularly polarized radiation of an upper frequency band and exciting the monopole array;
The microstrip structure is used as a coupling feed structure and is arranged on the top surface of the second substrate, and the microstrip structure is used for exciting TM10 and TM01 modes of the corner cut rectangular patch and generating radiation zero points outside the working frequency band so as to realize circular polarization characteristics and filtering characteristics;
The monopole arrays are embedded in the third substrate, top loads are respectively distributed on the top surface of the third substrate, and the monopole arrays are excited by the patch mode of the first substrate to generate omnidirectional linearly polarized radiation of a lower frequency band;
the coaxial feeder vertically penetrates through the third substrate from the bottom surface of the third substrate, and the second substrate is connected with the microstrip structure;
the bottom surface of the first substrate is connected with the top surface of the second substrate, the bottom surface of the second substrate is connected with the top surface of the third substrate, and the bottom surface of the third substrate is a ground plane.
Optionally, the vertical projection of the rectangular corner-cut patch is located in the target area, where the rectangular corner-cut patch is used as a radiating element to receive the coupling feed of the microstrip structure and generate right-hand circularly polarized radiation of the upper frequency band, and the rectangular corner-cut patch is used as a near-field parasitic unit and the microstrip structure to excite the monopole array and is used to generate omnidirectional linearly polarized radiation of the lower frequency band;
The target area is an area surrounded by the monopole array.
Optionally, the microstrip structure is spatially located directly below the corner cut rectangular patch, which includes: a T-type microstrip structure and an inverted y-type microstrip structure;
The T-shaped microstrip structure and the inverted y-shaped microstrip structure jointly construct two orthogonal current paths with a 90-degree phase difference, and simultaneously excite TM10 and TM01 modes of the corner-cut rectangular patch;
the top edge of the T-shaped microstrip structure is parallel to the long side of the inverted y-shaped microstrip structure, and the length of the top edge is smaller than that of the long side.
Optionally, the monopole array includes: a 2 x2 monopole array;
each monopole includes: a cylinder and a top load;
the cylinder vertically penetrates through the third substrate from the ground plane and is connected with the top load;
the top load is round and is distributed on the top of the third substrate;
The cylinder and the top load are both metal materials.
Optionally, the coaxial feeder includes: a center conductor and an outer wall;
the center conductor vertically passes through the third substrate from the ground plane, and the second substrate is connected with the long side of the inverted y-type microstrip structure;
The outer wall is connected with the ground plane.
Optionally, the parameters of the first substrate, the second substrate, and the third substrate are all: using Taconic RF-60 material, the relative dielectric constant er=6.15, loss tangent tan δ=0.0028, copper clad thickness 0.017 mm, cross-sectional dimensions 34×34× 34 mm;
the thickness of the first substrate is 3.18 mm;
the thickness of the second substrate is 1.27 mm;
The thickness of the third substrate is 3 mm.
Optionally, the length of the rectangular patch with the chamfer is 14 mm, and the length of the hypotenuse with the chamfer is 2mm.
Optionally, the radius of the central conductor is 0.32 mm, and the resistance of the coaxial feeder is 50Ω.
Optionally, a scoop-type defective ground structure is formed on the ground plane;
the scoop-like defective ground structure includes: a spoon handle structure and an opening structure;
the projection position of the joint of the central conductor and the long side is positioned in the opening structure;
one end of the spoon handle structure is connected with the opening structure, and the other end of the spoon handle structure is positioned at the edge of the ground plane.
Optionally, the corner cut of the corner cut rectangular patch is one diagonal corner of the rectangle, and the other diagonal corner is not corner cut.
The invention provides a small-sized dual-band dual-polarized filter antenna, which comprises: the antenna comprises a corner-cut rectangular patch, a microstrip structure, a monopole array and a coaxial feeder. The corner cut rectangular patch is arranged on the top surface of the first substrate and is used for receiving coupling feed of the microstrip structure, generating right-hand circularly polarized radiation of an upper frequency band and exciting the monopole array.
The microstrip structure is used as a coupling feed structure and is arranged on the top surface of the second substrate, and the microstrip structure is used for exciting TM10 and TM01 modes of the corner cut rectangular patch and generating radiation zero points outside the working frequency band so as to realize circular polarization characteristics and filtering characteristics. The monopole arrays are embedded in the third substrate, top loads are respectively distributed on the top surface of the third substrate, and the monopole arrays are excited by the patch mode of the first substrate to generate omnidirectional linearly polarized radiation in a lower frequency band.
The coaxial feeder line vertically penetrates through the third substrate from the bottom surface of the third substrate, and the second substrate is connected with the microstrip structure. The bottom surface of the first substrate is connected with the top surface of the second substrate, the bottom surface of the second substrate is connected with the top surface of the third substrate, and the bottom surface of the third substrate is a ground plane.
The small-sized dual-band dual-polarized filter antenna provided by the invention is integrally formed based on three layers of substrates, and the circular polarization performance of the antenna can be obviously improved by the rectangular corner-cut patch. The antenna can be used as a radiating element for generating RHCP radiation in an upper frequency band and can also be used as a near-field parasitic element to excite a monopole array below, so that omnidirectional linearly polarized radiation is generated in a lower frequency band.
The microstrip structure forms a near-field resonance parasitic element, and radiation zero points are generated outside the working frequency band so as to improve the overall frequency selectivity, realize the filter characteristic, and excite TM10 and TM01 modes of the patch so as to realize the circular polarization characteristic, without any power divider or phase delay line, thereby reducing the design complexity and the insertion loss.
The monopole array can be well excited by the corner cut rectangular patch mode, so that the omni-directional linear polarization of the lower frequency band is realized, and meanwhile, the low-profile characteristic is realized by adopting a top load. The scoop-type defective ground structure increases the current path, thereby reducing the size of the antenna, and the structure increases a new resonance point, combines with the original resonance mode, and widens the working frequency band of the antenna. The whole dual-polarized filter antenna not only provides two frequency bands for communication under the same aperture, but also does not need to integrate an additional filter system, reduces occupied space and has higher practicability.
Drawings
Various other advantages and benefits will become apparent to those of ordinary skill in the art upon reading the following detailed description of the preferred embodiments. The drawings are only for purposes of illustrating the preferred embodiments and are not to be construed as limiting the invention. Also, like reference numerals are used to designate like parts throughout the figures. In the drawings:
Fig. 1 is a schematic diagram of an exploded structure of a preferred small dual-band dual-polarized filter antenna according to an embodiment of the present invention;
fig. 2 is a schematic top view of a preferred small dual-band dual-polarized filter antenna according to an embodiment of the present invention;
fig. 3 is a schematic side view of a preferred small dual-band dual-polarized filter antenna according to an embodiment of the present invention;
Fig. 4 is a graph of S11 parameters of a preferred small dual-band dual-polarized filter antenna according to an embodiment of the present invention;
Fig. 5 is a gain graph of a preferred small dual-band dual-polarized filter antenna in an embodiment of the present invention;
fig. 6 is an axial ratio diagram of a preferred small dual-band dual-polarized filter antenna in accordance with an embodiment of the present invention;
Fig. 7 is a lobe diagram of the small dual-band dual-polarized filter antenna at 6.1GHz in an embodiment of the invention;
fig. 8 is a lobe diagram of a preferred small dual band dual polarized filter antenna of an embodiment of the present invention at 9.2 GHz.
Detailed Description
In order that the above-recited objects, features and advantages of the present invention will become more readily apparent, a more particular description of the invention will be rendered by reference to the appended drawings and appended detailed description. It should be understood that the specific embodiments described herein are for purposes of illustration only and are not intended to limit the scope of the invention.
The inventor finds that, at present, in order to realize that a ground intelligent system radiates omnidirectional Linearly Polarized (LP) waves and satellite communication radiates right-hand circularly polarized (RHCP) waves, a plurality of different antennas are installed in the communication system, so that the occupied space is inevitably increased.
While few dual-band antennas have been designed, although dual-band antennas are implemented in one antenna, some have polarization mismatch problems, which reduce communication quality, and such antennas are relatively complex in structure, have a high profile, and are not conducive to miniaturization. Some antennas that overcome the problem of higher profile heights face the problem of narrow bandwidth and no filtering function.
In view of the above problems, the inventors creatively propose a miniaturized dual-band dual-polarized filter antenna through a great deal of research and tests, and the technical scheme provided by the invention is explained and illustrated in detail below.
The invention relates to a small-sized dual-band dual-polarized filter antenna, which comprises: the antenna comprises a corner-cut rectangular patch, a microstrip structure, a monopole array and a coaxial feeder. The corner cut rectangular patch is arranged on the top surface of the first substrate and is used for receiving coupling feed of the microstrip structure, generating right-hand circularly polarized radiation of an upper frequency band and exciting the monopole array.
The microstrip structure is used as a coupling feed structure and is arranged on the top surface of the second substrate, and the microstrip structure is used for exciting TM10 and TM01 modes of the corner cut rectangular patch and generating radiation zero points outside the working frequency band so as to realize circular polarization characteristics and filtering characteristics. The monopole arrays are embedded in the third substrate, top loads are respectively distributed on the top surface of the third substrate, and the monopole arrays are excited by the patch mode of the first substrate to generate omnidirectional linearly polarized radiation in a lower frequency band. The coaxial feeder line vertically penetrates through the third substrate from the bottom surface of the third substrate, and the second substrate is connected with the microstrip structure.
In the above structure, the overall structure is based on three substrates, and the bottom surface of the first substrate is connected to the top surface of the second substrate, so that the microstrip structure is also equivalent to being located on the bottom surface of the first substrate. The bottom surface of the second substrate is connected to the top surface of the third substrate, so that the top load is also equivalent to being located on the bottom surface of the second substrate. And the bottom of the third substrate is a ground plane.
The rectangular corner-cut patch is located on the top surface of the first substrate, and when the rectangular corner-cut rectangular patch is vertically projected on the third substrate, the rectangular corner-cut rectangular patch is located in a target area, wherein the target area is an area surrounded by the monopole array. I.e. the area of the corner cut rectangular patch, needs to be smaller than the area of the area enclosed by all the monopoles, and the vertical projection needs to be within the area. If outside this range, the omnidirectional linear polarization radiation and the right-hand circular polarization radiation may be affected.
The corner cut rectangular patch has two functions, one can be used as a radiation element for receiving coupling feed of the microstrip structure to generate right-hand circularly polarized radiation of an upper frequency band, and the other can be used as a near-field parasitic unit and the microstrip structure to excite the monopole array to generate omnidirectional linearly polarized radiation of a lower frequency band.
The microstrip structure is spatially located directly below the corner cut rectangular patch, comprising: t-type microstrip structures and inverted y-type microstrip structures. The T-shaped microstrip structure and the inverted y-shaped microstrip structure form a near field resonance parasitic element, can generate radiation zero outside a working frequency band, improve the overall frequency selectivity, realize the filtering characteristic and enable the small dual-band dual-polarized filter antenna not to be interfered by other frequency bands outside a required frequency band. For example: the small-sized dual-band dual-polarized filter antenna provided by the invention can be used in the following frequency bands: 5.5 GHz-6.6 GHz, upper frequency band: communication is realized between 8.9GHz and 9.5GHz, so that electromagnetic waves in other frequency bands can be well filtered by the microstrip structure, communication of the small dual-band dual-polarized filter antenna is not interfered, and communication of other antennas nearby is not interfered.
Meanwhile, the T-shaped microstrip structure and the inverted y-shaped microstrip structure jointly construct two orthogonal current paths with a 90-degree phase difference, and simultaneously excite TM10 and TM01 modes of the corner cut rectangular patch, so that circular polarization characteristics are realized, any power divider or phase delay line is not needed, the design complexity of the antenna is reduced, and the insertion loss is reduced.
In the specific layout, the top edge of the T-shaped microstrip structure is parallel to the long side of the inverted y-shaped microstrip structure, and the length of the top edge of the T-shaped microstrip structure is smaller than that of the long side of the inverted y-shaped microstrip structure. A more visual understanding can be obtained with particular reference to the illustrations of fig. 1 and 2.
Preferred choices for monopole arrays include: a2 x 2 monopole array; each monopole includes: a cylinder and a top load. The cylinder vertically penetrates through the third substrate from the ground plane (namely the bottom surface of the third substrate) and is connected with the top load; the top load is round and distributed on the top of the third substrate in a dispersed manner. The low profile characteristics of a small dual band dual polarized filter antenna can be achieved by using a top load.
The cylinder and the top load are both made of metal. Thus for a 2 x 2 monopole array there are four pairs of cylinders and top loads, which are distributed in a rectangular fashion. The area of the rectangle formed by the four top loads is larger than the area of the corner cut rectangular patch, and the vertical projection of the corner cut rectangular patch needs to be located within the rectangular area formed by the four top loads.
Preferred choices of coaxial feeders include: a center conductor and an outer wall; the center conductor vertically passes through the third substrate from the ground plane, and the second substrate is connected with the long side of the inverted y-type microstrip structure, so that very good impedance matching is realized. The outer wall of the coaxial feeder is connected with the ground plane.
The parameters of the structures can be determined according to the frequency bands required by the operation of the small dual-band dual-polarized filter antenna, and by taking dual-band 5.5 GHz-6.6 GHz and 8.9 GHz-9.5 GHz as examples, the inventor obtains optimal parameters through a large number of simulations and actual measurement as follows:
The parameters of the first substrate, the second substrate and the third substrate are as follows: with Taconic RF-60 material, the relative dielectric constant er=6.15, loss tangent tan δ=0.0028, copper clad thickness 0.017mm (millimeters), cross-sectional dimensions 34×34mm. The thickness of the first substrate is 3.18mm; the thickness of the second substrate is 1.27mm; the thickness of the third substrate was 3mm. The length of the rectangular corner-cut patch is 14mm, and the length of the bevel edge of the corner-cut patch is 2mm. The radius of the center conductor is 0.32mm and the resistance of the coaxial feed line is 50Ω (ohm).
In order to further improve the performance of the small dual-band dual-polarized filter antenna, the small dual-band dual-polarized filter antenna further provides a scoop-type defected ground structure, which comprises: a spoon handle structure and an opening structure; the projection position of the joint of the central conductor and the long side is positioned in the opening structure; one end of the spoon handle structure is connected with the opening structure, and the other end of the spoon handle structure is positioned at the edge of the ground plane. The scoop-type defected ground structure is arranged on the ground plane, a current path is increased, and therefore the overall size of the small dual-band dual-polarized filter antenna is reduced, and a new resonance point is further added, for example, the new resonance point is 6.6GHz, and one frequency band of an original resonance mode is 5.5 GHz-6.0 GHz, so that the new resonance point can be combined with the original resonance mode to obtain 5.5 GHz-6.6 GHz, and the working frequency band of the small dual-band dual-polarized filter antenna is widened.
For a better understanding of the small dual-band dual-polarized filter antenna according to the present invention, referring to fig. 1, an exploded structure of a preferred small dual-band dual-polarized filter antenna according to an embodiment of the present invention is shown. In fig. 1, a specific corner-cut rectangular patch shape, a circular top load, a T-type microstrip structure, and an inverted y-type microstrip structure are shown as examples, and the corner-cut rectangular patch, the microstrip structure, and the monopole array are not shown, and can be only the structures shown in fig. 1.
The top surface of the first substrate is provided with a rectangular corner-cut patch, and as can be seen from the schematic diagram of the top view structure of the small dual-band dual-polarized filter antenna shown in fig. 2, the corner-cut of the rectangular corner-cut patch is one diagonal corner of the rectangle, and the other diagonal corner is not.
In fig. 1, the T-type microstrip line represents a T-type microstrip structure, and the inverted y-type microstrip line represents an inverted y-type microstrip structure, which is disposed on the top surface of the second substrate. As can be seen from fig. 2, the T-shaped microstrip structure and the inverted y-shaped microstrip structure are spatially located right below the rectangular corner-cut patch, the top edge of the T-shaped microstrip structure is parallel to the long side of the inverted y-shaped microstrip structure, and the length of the top edge is smaller than that of the long side. And the connection part of the coaxial feeder line center conductor and the long side of the inverted y-shaped microstrip structure is positioned in the opening structure of the spoon-shaped defected ground structure. A small part of each of the top edge of the T-shaped microstrip structure and the long edge of the inverted y-shaped microstrip structure is also arranged in the opening structure of the spoon-shaped defected ground structure.
The third substrate is embedded with a 2x 2 monopole array, each monopole top load is arranged on the top surface of the third substrate, the area of a rectangle formed by the 4 top loads is larger than that of the corner cut rectangular patch, and the vertical projection of the corner cut rectangular patch needs to be located in the rectangular area formed by the 4 top loads.
The center conductor of the coaxial feeder vertically passes through the third substrate from the ground plane, and the second substrate is connected with the long side of the inverted y-type microstrip structure. The side view structure of the small dual band dual polarized filter antenna shown in fig. 3 can be intuitively understood.
For the whole small-sized dual-band dual-polarized filter antenna, the circular polarization performance of the antenna can be remarkably improved by the rectangular corner cut patch. The antenna can be used as a radiating element for generating RHCP radiation in an upper frequency band and can also be used as a near-field parasitic element to excite a monopole array below, so that omnidirectional linearly polarized radiation is generated in a lower frequency band. The microstrip structure forms a near-field resonance parasitic element, and radiation zero points are generated outside the working frequency band to improve the overall frequency selectivity, and simultaneously excites TM10 and TM01 modes of the patch to realize circular polarization characteristics and filtering characteristics, without any power divider or phase delay line, thereby reducing design complexity and insertion loss.
The monopole array can be well excited by the corner cut rectangular patch mode, so that the omni-directional linear polarization of the lower frequency band is realized, and meanwhile, the low-profile characteristic is realized by adopting a top load. The scoop-type defective ground structure increases the current path, thereby reducing the size of the antenna, and the structure increases a new resonance point, combines with the original resonance mode, and widens the working frequency band of the antenna. The whole dual-polarized filter antenna not only provides two frequency bands for communication under the same aperture, but also does not need to integrate an additional filter system, thereby reducing the occupied space.
The performance of the small-sized dual-band dual-polarized filter antenna is subjected to simulation test and actual measurement, and the obtained results are as follows:
Referring to fig. 4, an S11 parameter graph of a small dual band dual polarized filter antenna is shown. The abscissa is the frequency Freq, unit [ GHz ]; the ordinate is the S parameter value in [ dB ]. The S parameters of the small dual-band dual-polarized filter antenna can be seen to be smaller than-10 dB in two frequency bands of 5.5 GHz-6.6 GHz and 8.5 GHz-10 GHz, and the practical use requirement is met.
Referring to fig. 5, a gain profile of a small dual band dual polarized filter antenna is shown. Wherein, the abscissa is the frequency Freq, unit [ GHz ]; the ordinate is total gain GainTotal in units of [ dB ]. As can be seen from FIG. 5, the gains of the small dual-band dual-polarized filter antenna in the two frequency bands of 5.5 GHz-6.6 GHz and 8.9 GHz-9.5 GHz are all above 0dB, and the small dual-band dual-polarized filter antenna has good gains. The filtering characteristic of the small dual-band dual-polarized filter antenna can be seen from the gain curve, the gain between two frequency bands is very low, and the small dual-band dual-polarized filter antenna has good out-of-band rejection characteristic.
Referring to fig. 6, an axial ratio graph of a small dual band dual polarized filter antenna is shown. Wherein, the abscissa is the frequency Freq, unit [ GHz ]; the ordinate is the axial ratio AxialRatioValue in [ dB ]. In fig. 6, it can be seen that the curve of the small dual-band dual-polarized filter antenna in the frequency band of 8.9 ghz-9.5 ghz is below 3dB, which meets the requirement of circular polarization. Finally, the curve of S11< -10dB and the axial ratio <3dB is synthesized, so that the right-hand circular polarization of the small dual-band dual-polarized filter antenna can be effectively realized in the frequency band of 8.9 GHz-9.5 GHz.
Referring to fig. 7, there is shown a lobe diagram of the small dual band dual polarized filter antenna at 6.1GHz, the solid line in fig. 7 shows a lobe curve of 0 degrees in direction, and the broken line shows a lobe curve of 90 degrees in direction. Referring to fig. 8, there is shown a lobe diagram of the small dual band dual polarized filter antenna at 9.2GHz, the solid line in fig. 8 shows a lobe curve of 0 degrees in direction, and the broken line shows a lobe curve of 90 degrees in direction. As can be seen from fig. 7 and 8, the small dual-band dual-polarized filter antenna provided by the invention has better main lobe radiation in two frequency bands, namely 5.5 GHz-6.6 GHz and 8.9 GHz-9.5 GHz. The data show that the working frequency band of the small dual-band dual-polarized filter antenna provided by the invention is wider than that of the existing dual-band filter antenna, so that the communication of two frequency bands is provided under the same aperture, an additional filter system is not required to be integrated, and the working requirement is met.
In summary, the small dual-band dual-polarized filter antenna of the present invention includes: the antenna comprises a corner-cut rectangular patch, a microstrip structure, a monopole array and a coaxial feeder. The corner cut rectangular patch is arranged on the top surface of the first substrate and is used for receiving coupling feed of the microstrip structure, generating right-hand circularly polarized radiation of an upper frequency band and exciting the monopole array.
The microstrip structure is used as a coupling feed structure and is arranged on the top surface of the second substrate, and the microstrip structure is used for exciting TM10 and TM01 modes of the corner cut rectangular patch and generating radiation zero points outside the working frequency band so as to realize circular polarization characteristics and filtering characteristics. The monopole arrays are embedded in the third substrate, top loads are respectively distributed on the top surface of the third substrate, and the monopole arrays are excited by the corner-cut rectangular patch modes to generate omnidirectional linearly polarized radiation of a lower frequency band.
The coaxial feeder line vertically penetrates through the third substrate from the bottom surface of the third substrate, and the second substrate is connected with the microstrip structure. The bottom surface of the first substrate is connected with the top surface of the second substrate, the bottom surface of the second substrate is connected with the top surface of the third substrate, and the bottom surface of the third substrate is a ground plane.
The small-sized dual-band dual-polarized filter antenna provided by the invention is integrally formed based on three layers of substrates, and the circular polarization performance of the antenna can be obviously improved by the rectangular corner-cut patch. The antenna can be used as a radiating element for generating RHCP radiation in an upper frequency band and can also be used as a near-field parasitic element to excite a monopole array below, so that omnidirectional linearly polarized radiation is generated in a lower frequency band.
The microstrip structure forms a near-field resonance parasitic element, and radiation zero points are generated outside the working frequency band to improve the overall frequency selectivity, and simultaneously excites TM10 and TM01 modes of the patch to realize circular polarization characteristics and filtering characteristics, without any power divider or phase delay line, thereby reducing design complexity and insertion loss.
The monopole array can be well excited by the corner cut rectangular patch mode, so that the omni-directional linear polarization of the lower frequency band is realized, and meanwhile, the low-profile characteristic is realized by adopting a top load. The scoop-type defective ground structure increases the current path, thereby reducing the size of the antenna, and the structure increases a new resonance point, combines with the original resonance mode, and widens the working frequency band of the antenna. The whole dual-polarized filter antenna not only provides two frequency bands for communication under the same aperture, but also does not need to integrate an additional filter system, reduces occupied space and has higher practicability.
It is further noted that relational terms such as first and second, and the like are used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Moreover, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, or apparatus.
The embodiments of the present invention have been described above with reference to the accompanying drawings, but the present invention is not limited to the above-described embodiments, which are merely illustrative and not restrictive, and many forms may be made by those having ordinary skill in the art without departing from the spirit of the present invention and the scope of the claims, which are to be protected by the present invention.
Claims (10)
1. A small dual-band dual-polarized filter antenna, characterized in that it comprises: the antenna comprises a corner-cut rectangular patch, a microstrip structure, a monopole array and a coaxial feeder;
The corner-cut rectangular patch is arranged on the top surface of the first substrate and is used for receiving coupling feed of the microstrip structure, generating right-hand circularly polarized radiation of an upper frequency band and exciting the monopole array;
The microstrip structure is used as a coupling feed structure and is arranged on the top surface of the second substrate, and the microstrip structure is used for exciting TM10 and TM01 modes of the corner cut rectangular patch and generating radiation zero points outside the working frequency band so as to realize circular polarization characteristics and filtering characteristics;
The monopole arrays are embedded in the third substrate, top loads are respectively distributed on the top surface of the third substrate, and the monopole arrays are excited by the patch mode of the first substrate to generate omnidirectional linearly polarized radiation of a lower frequency band;
the coaxial feeder vertically penetrates through the third substrate from the bottom surface of the third substrate, and the second substrate is connected with the microstrip structure;
the bottom surface of the first substrate is connected with the top surface of the second substrate, the bottom surface of the second substrate is connected with the top surface of the third substrate, and the bottom surface of the third substrate is a ground plane.
2. The small dual-band dual-polarized filter antenna of claim 1, wherein a vertical projection of the rectangular corner-cut patch is located in a target area, the rectangular corner-cut patch is used as a radiating element for receiving coupling feed of the microstrip structure to generate right-hand circularly polarized radiation of an upper band, and is used as a near-field parasitic element to excite the monopole array to generate omnidirectional linearly polarized radiation of a lower band;
The target area is an area surrounded by the monopole array.
3. The miniature dual band dual polarized filter antenna of claim 1, wherein said microstrip structure is spatially located directly below said corner cut rectangular patch, comprising: a T-type microstrip structure and an inverted y-type microstrip structure;
The T-shaped microstrip structure and the inverted y-shaped microstrip structure jointly construct two orthogonal current paths with a 90-degree phase difference, and simultaneously excite TM10 and TM01 modes of the corner-cut rectangular patch;
the top edge of the T-shaped microstrip structure is parallel to the long side of the inverted y-shaped microstrip structure, and the length of the top edge is smaller than that of the long side.
4. The miniature dual band dual polarized filtered antenna of claim 1, wherein said monopole array comprises: a 2x 2 monopole array;
each monopole includes: a cylinder and a top load;
the cylinder vertically penetrates through the third substrate from the ground plane and is connected with the top load;
the top load is round and is distributed on the top of the third substrate;
The cylinder and the top load are both metal materials.
5. A compact dual band dual polarized filtered antenna as claimed in claim 3, wherein said coaxial feed comprises: a center conductor and an outer wall;
the center conductor vertically passes through the third substrate from the ground plane, and the second substrate is connected with the long side of the inverted y-type microstrip structure;
The outer wall is connected with the ground plane.
6. The miniature dual-band dual-polarized filter antenna of claim 1, wherein parameters of said first substrate, said second substrate, and said third substrate are all: using Tacouc RF-60 material, the relative dielectric constant epsilon r=6.15, loss tangent tan delta=0.0028, copper clad thickness 0.017mm, cross section size 34×34mm;
the thickness of the first substrate is 3.18mm;
The thickness of the second substrate is 1.27mm;
The thickness of the third substrate is 3mm.
7. The small dual-band dual-polarized filter antenna of claim 1, wherein the length of the corner cut rectangular patch is 14mm and the length of the corner cut hypotenuse is 2mm.
8. The small dual-band dual-polarized filter antenna of claim 5, wherein the radius of the center conductor is 0.32mm, and the resistance of the coaxial feed line is 50Ω.
9. The small dual-band dual-polarized filter antenna of claim 5, wherein said ground plane is provided with a scoop-like defected ground structure;
the scoop-like defective ground structure includes: a spoon handle structure and an opening structure;
the projection position of the joint of the central conductor and the long side is positioned in the opening structure;
one end of the spoon handle structure is connected with the opening structure, and the other end of the spoon handle structure is positioned at the edge of the ground plane.
10. The small dual-band dual-polarized filter antenna of claim 1, wherein the cut angle of the rectangular patch is one diagonal of the rectangle, and the other diagonal is not cut angle.
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