A dual-polarized patch antenna array fed by artificial surface plasmons

Abstract

The present invention provides a dual-polarized microstrip patch antenna array fed by artificial surface plasmons. It comprises: a dual-polarized microstrip patch antenna array and two sets of series feeding networks based on artificial surface plasmons; the series feeding network based on artificial surface plasmons is composed of a straight artificial surface plasmon transmission line located on the lower surface of a dielectric substrate, four sections of V-shaped artificial surface plasmon transmission lines located on the upper surface of a dielectric substrate, and a metal column integrated in the substrate for connecting the transmission lines on the upper and lower surfaces of the substrate; the radiation patch of the dual-polarized microstrip patch antenna array is located on the upper surface of the dielectric substrate, and the metal floor is located on the lower surface of the dielectric substrate. The present invention utilizes a series feeding network based on artificial surface plasmons to feed the dual-polarized microstrip patch antenna array; the single-layer structure is compact and easy to process and realize; it has good impedance bandwidth and stable radiation pattern and directional radiation characteristics.

Description

Technical Field

[0001] The invention relates to the technical field of patch antennas, and in particular to a dual-polarized microstrip patch antenna array fed by artificial surface plasmons. Background Art

[0002] Most traditional transmission line structures have large transmission losses in the millimeter-wave terahertz frequency band, making it difficult to achieve long-distance transmission. The artificial surface plasmon transmission line structure provides a new research idea for this problem. The artificial surface plasmon transmission line structure is simple and compact, easy to process and integrate. By adjusting the geometric structure of its surface, it can be used as an antenna alone for radiation, or as a feed line to feed the radiating structure. The types of antennas based on artificial surface plasmons include leaky wave antennas with beam scanning characteristics and high-gain antennas with directional radiation. These antennas place radiating structures such as patches on one or both sides of the artificial surface plasmon transmission line, and couple the energy transmitted along the artificial surface plasmon to the nearby radiating structure, and then radiate the energy into free space to realize the antenna function.

[0003] Artificial surface plasmon antennas with different polarizations are of great significance for achieving polarization diversity in modern wireless communications. At present, the circularly polarized and dual-polarized antennas based on artificial surface plasmons in the prior art are beam scanning antennas, which are not the first choice for wireless communication applications. In fact, both the radiating element and the feeding network are important for antenna arrays with dual linear or circular polarization. How to design an artificial surface plasmon feeding network with a compact structure is an urgent problem to be solved. Summary of the invention

[0004] The invention provides an artificial surface plasmon-fed dual-polarized microstrip patch antenna array to realize the radiation characteristics of a traditional dual-polarized microstrip patch antenna array.

[0005] In order to achieve the above object, the present invention adopts the following technical scheme.

[0006] A dual-polarized microstrip patch antenna array fed by artificial surface plasmons, comprising: a dual-polarized microstrip patch antenna array and two sets of series feeding networks based on artificial surface plasmons;

[0007] The artificial surface plasmon-based series feeding network is composed of a linear artificial surface plasmon transmission line with an open terminal located on the lower surface of a dielectric substrate, four sections of V-shaped artificial surface plasmon transmission lines located on the upper surface of the dielectric substrate, and a metal column integrated in the dielectric substrate for connecting the transmission lines on the upper and lower surfaces of the substrate;

[0008] The metal column integrated in the dielectric substrate is located at the open circuit terminal of the lower linear artificial surface plasma transmission line and is connected to the last branch of the V-shaped artificial surface plasma transmission line located on the upper surface of the dielectric substrate;

[0009] The radiation patch of the dual-polarization microstrip patch antenna array is located on the upper surface of the dielectric substrate, and the metal floor is located on the lower surface of the dielectric substrate.

[0010] Preferably, the two groups of series feeding networks based on artificial surface plasmon have the same structure and are placed in parallel and facing each other, so as to realize ±45 degree polarization feeding of the dual-polarized microstrip patch antenna array.

[0011] Preferably, the horizontal parts of the first three V-shaped artificial surface plasma transmission line branches located on the upper surface of the dielectric substrate in the artificial surface plasmon-based series feeding network are parallel to the linear open-ended artificial surface plasma transmission line located on the lower surface of the dielectric substrate.

[0012] Preferably, there is an adjustable lateral offset between the horizontal parts of the first three V-shaped artificial surface plasma transmission line branches located on the upper surface of the dielectric substrate and the straight-line open-ended artificial surface plasma transmission line located on the lower surface of the dielectric substrate, and each lateral offset is the same or different.

[0013] Preferably, the radiation patch is a square patch, and rectangular grooves are etched on two adjacent sides of the patch. The output ports of the four V-shaped coupling branches of the feeding network are respectively connected to the rectangular grooves in the four patches; the input signal is coupled to the four coupling branches on the upper surface of the dielectric substrate through a linear artificial surface plasmon transmission line located on the lower surface of the dielectric substrate, and then the radiation patch is stimulated to radiate, and the proportion of energy coupled to each branch is controlled by controlling the lateral offset between the first three coupling branches and the trunk transmission line, thereby achieving equal amplitude excitation of the four patch antennas.

[0014] It can be seen from the technical solutions provided by the above-mentioned embodiments of the present invention that the dual-polarized microstrip patch antenna array based on artificial surface plasmon feeding in the embodiments of the present invention has the advantages of simple and novel structure and easy processing and integration.

[0015] Additional aspects and advantages of the present invention will be given in part in the following description, which will become obvious from the following description, or may be learned through practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the accompanying drawings required for use in the description of the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other accompanying drawings can be obtained based on these accompanying drawings without paying creative work.

[0017] Figure 1 A three-dimensional structural diagram of a dual-polarized microstrip patch antenna array fed by artificial surface plasmon provided in an embodiment of the present invention;

[0018] Figure 2 A top view of a dual-polarized microstrip patch antenna array fed by artificial surface plasmon provided in an embodiment of the present invention;

[0019] Figure 3 A front view of a dual-polarized microstrip patch antenna array fed by artificial surface plasmon provided by an embodiment of the present invention;

[0020] Figure 4 The design result of the XOZ surface 26GHz radiation pattern of the port 1-fed dual-polarized microstrip patch antenna array fed by artificial surface plasmon provided in the embodiment of the present invention

[0021] Figure 5 The design result of the 26GHz radiation pattern of the yoz plane fed by port 1 of a dual-polarized microstrip patch antenna array fed by artificial surface plasmon provided in the embodiment of the present invention

[0022] Figure 6 The design result of the XOZ surface 26GHz radiation pattern of the port 2-fed dual-polarized microstrip patch antenna array fed by artificial surface plasmon provided in the embodiment of the present invention

[0023] Figure 7 The design result of the 26GHz radiation pattern of the yoz plane fed by port 2 of a dual-polarized microstrip patch antenna array fed by artificial surface plasmon provided in the embodiment of the present invention

[0024] Figure 8 A schematic diagram of S-parameter design results of a dual-polarized microstrip patch antenna array fed by artificial surface plasmon provided in an embodiment of the present invention;

[0025] Fig. 9 A schematic diagram of gain design results of a dual-polarized microstrip patch antenna array fed by artificial surface plasmon provided in an embodiment of the present invention. DETAILED DESCRIPTION

[0026] The embodiments of the present invention are described in detail below, examples of which are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present invention, and cannot be interpreted as limiting the present invention.

[0027] It will be understood by those skilled in the art that, unless expressly stated, the singular forms "one", "said", and "the" used herein may also include plural forms. It should be further understood that the term "comprising" used in the specification of the present invention refers to the presence of the features, integers, steps, operations, elements and / or components, but does not exclude the presence or addition of one or more other features, integers, steps, operations, elements, components and / or groups thereof. It should be understood that when we refer to an element as being "connected" or "coupled" to another element, it may be directly connected or coupled to the other element, or there may be intermediate elements. In addition, the "connection" or "coupling" used herein may include wireless connection or coupling. The term "and / or" used herein includes any unit and all combinations of one or more associated listed items.

[0028] It will be understood by those skilled in the art that, unless otherwise defined, all terms (including technical and scientific terms) used herein have the same meaning as those generally understood by those skilled in the art in the art to which the present invention belongs. It should also be understood that terms such as those defined in common dictionaries should be understood to have meanings consistent with the meanings in the context of the prior art, and will not be interpreted with idealized or overly formal meanings unless defined as herein.

[0029] To facilitate understanding of the embodiments of the present invention, several specific embodiments will be further explained below with reference to the accompanying drawings, and each embodiment does not constitute a limitation on the embodiments of the present invention.

[0030] The present invention provides a dual-polarized microstrip patch antenna array with a single-layer structure and fed by an artificial surface plasmon transmission line. The antenna array utilizes two groups of orthogonally placed series feeding networks based on artificial surface plasmon transmission lines to feed the microstrip patch antenna array, thereby realizing the radiation characteristics of a traditional dual-polarized microstrip patch antenna array.

[0031] The three-dimensional structure diagram of a dual-polarized microstrip patch antenna array fed by artificial surface plasmon provided by an embodiment of the present invention is shown in FIG. Figure 1 As shown, the top view is Figure 2 As shown, the front view is Figure 3 The antenna array includes a dual-polarized microstrip patch antenna array 4 and two sets of artificial surface plasmon-based series feeding networks with the same structure and placed in parallel and facing each other.

[0032] The artificial surface plasmon-based series feeding network is composed of a straight open-ended artificial surface plasmon transmission line 2 located on the lower surface of a dielectric substrate 1, four V-shaped artificial surface plasmon transmission lines located on the upper surface of the dielectric substrate 1, and a metal column 6 integrated in the dielectric substrate 1 for connecting the transmission lines on the upper and lower surfaces of the substrate.

[0033] The metal column 6 integrated in the dielectric substrate 1 is located at the open circuit terminal of the lower linear artificial surface plasmon transmission line and is connected to the last branch of the V-shaped artificial surface plasmon transmission line located on the upper surface of the dielectric substrate 1 .

[0034] The radiation patch of the dual-polarized microstrip patch antenna array 4 is located on the upper surface of the dielectric substrate 1 , and the metal floor 5 is located on the lower surface of the dielectric substrate 1 .

[0035] The horizontal parts of the first three V-shaped artificial surface plasma transmission line branches on the upper surface of the dielectric substrate in the 1-to-4 series feeding network based on artificial surface plasmon are parallel to the straight-line open-ended artificial surface plasma transmission line on the lower surface of the dielectric substrate.

[0036] There is a flexible and adjustable lateral offset between the horizontal parts of the first three V-shaped artificial surface plasma transmission line branches on the upper surface of the dielectric substrate and the linear terminal open-circuit artificial surface plasma transmission line on the lower surface of the dielectric substrate, and each lateral offset is the same or different.

[0037] The radiation patch is a square patch, and rectangular grooves are etched on two adjacent sides of the square patch. The output ports of the four V-shaped coupling branches of the feeding network are respectively connected to the rectangular grooves in the four patches. The input signal is coupled to the four coupling branches on the upper surface of the dielectric substrate 1 through the linear artificial surface plasmon transmission line located on the lower surface of the dielectric substrate 1, and then stimulates the radiation patch to radiate. By controlling the lateral offset between the first three coupling branches and the trunk transmission line, the proportion of energy coupled to each branch is controlled, thereby achieving equal amplitude excitation of the four patch antennas.

[0038] The dual-polarized microstrip patch antenna array of the embodiment of the present invention can be used in the 5G millimeter wave frequency band (24.25-27.5GHz). The dielectric substrate thickness is 0.762mm, the dielectric constant is 3.66, the metal layer thickness is 0.035mm, the square patch has a side length of 2.9mm, and rectangular grooves with a length of 1.8mm and a width of 0.2mm are etched on the adjacent sides, and the square metal floor has a side length of 6mm.

[0039] The simulation test results of the xoz and yoz plane radiation patterns at 26 GHz when ports 1 and 2 of the dual-polarized microstrip patch antenna array are fed respectively are as follows: Figure 4-7 As shown in the figure, it can be seen that the simulation and test results are in good agreement, the cross polarization and backward radiation are small, and the directional radiation characteristics are good. The test simulation results of the S parameters and gain of the above dual-polarization microstrip patch antenna array are shown in Figure 8 , 9 As shown, the -10dB impedance bandwidth of port 1 and port 2 is greater than 15.4%, and the maximum gains of port 1 and port 2 when fed are 8 and 7.8dBi respectively.

[0040] In summary, the embodiment of the present invention utilizes a series feeding network based on artificial surface plasmon to feed a dual-polarized patch antenna array; the single-layer structure is compact and easy to process and realize; and it has good impedance bandwidth and stable radiation pattern and directional radiation characteristics.

[0041] Those skilled in the art can understand that the accompanying drawings are only schematic diagrams of an embodiment, and the modules or processes in the accompanying drawings are not necessarily required to implement the present invention.

[0042] Each embodiment in this specification is described in a progressive manner, and the same or similar parts between the embodiments can be referred to each other, and each embodiment focuses on the differences from other embodiments. In particular, for the device or system embodiment, since it is basically similar to the method embodiment, the description is relatively simple, and the relevant parts can be referred to the partial description of the method embodiment. The device and system embodiments described above are merely schematic, wherein the units described as separate components may or may not be physically separated, and the components displayed as units may or may not be physical units, that is, they may be located in one place, or they may be distributed on multiple network units. Some or all of the modules may be selected according to actual needs to achieve the purpose of the scheme of this embodiment. Ordinary technicians in this field can understand and implement it without paying creative labor.

[0043] The above is only a preferred specific embodiment of the present invention, but the protection scope of the present invention is not limited thereto. Any changes or substitutions that can be easily thought of by a person skilled in the art within the technical scope disclosed by the present invention should be included in the protection scope of the present invention. Therefore, the protection scope of the present invention should be based on the protection scope of the claims.

Claims

1. A dual-polarized microstrip patch antenna array fed by artificial surface plasmon, characterized in that: include: Dual-polarized microstrip patch antenna array and two sets of artificial surface plasmon-based series feeding networks; The artificial surface plasmon-based series feeding network is composed of a linear artificial surface plasmon transmission line with an open terminal located on the lower surface of a dielectric substrate, four sections of V-shaped artificial surface plasmon transmission lines located on the upper surface of the dielectric substrate, and a metal column integrated in the dielectric substrate for connecting the transmission lines on the upper and lower surfaces of the substrate; The metal column integrated in the dielectric substrate is located at the open circuit terminal of the lower linear artificial surface plasma transmission line and is connected to the last branch of the V-shaped artificial surface plasma transmission line located on the upper surface of the dielectric substrate; The radiation patch of the dual-polarized microstrip patch antenna array is located on the upper surface of the dielectric substrate, and the metal floor is located on the lower surface of the dielectric substrate; The two sets of artificial surface plasmon-based series feeding networks have the same structure and are placed in parallel and facing each other to achieve ±45-degree polarization feeding of the dual-polarized microstrip patch antenna array. The horizontal parts of the first three V-shaped artificial surface plasma transmission line branches located on the upper surface of the dielectric substrate in the artificial surface plasmon-based series feeding network are parallel to the straight-line artificial surface plasma transmission line with open terminals located on the lower surface of the dielectric substrate; There is an adjustable lateral offset between the horizontal parts of the first three V-shaped artificial surface plasma transmission line branches on the upper surface of the dielectric substrate and the linear terminal open-circuit artificial surface plasma transmission line on the lower surface of the dielectric substrate, and each lateral offset is the same or different.

2. The dual-polarized microstrip patch antenna array fed by artificial surface plasmon according to claim 1, characterized in that: The radiation patch is a square patch, and rectangular grooves are etched on two adjacent sides of the patch. The output ports of four V-shaped coupling branches of the feeding network are respectively connected to the rectangular grooves in the four patches. The input signal is coupled to the four coupling branches on the upper surface of the dielectric substrate through a linear artificial surface plasmon transmission line located on the lower surface of the dielectric substrate, and then the radiation patch is excited to radiate. The proportion of energy coupled to each branch is controlled by controlling the lateral offset between the first three coupling branches and the trunk transmission line, thereby realizing equal amplitude excitation of the four patch antennas.

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