A parameter acquisition method of a circular loop antenna array with equal amplitude and in-phase patch feed

Abstract

The application discloses a parameter acquisition method of a circular ring antenna array with equal-amplitude and in-phase patch feed, the antenna array comprises a metal ground plane and a plurality of equal-amplitude and in-phase excited antenna units arranged in a linear array on the metal ground plane, the antenna unit has a common mode port, each common mode port comprises two single ports, an active common mode reflection coefficient of the common mode port of the antenna unit is equal to half of the sum of common mode reflection coefficients of the two single ports, the common mode reflection coefficient of the single port is calculated first, and the active common mode reflection coefficient of the common mode port is indirectly obtained; the application has the advantages that the calculation process is simplified, the calculation amount is small, the time consumption is relatively short, and the application is beneficial to popularization and application in engineering practice.

Description

Technical Field

[0001] This invention relates to the field of antenna array technology, and more specifically to a method for obtaining parameters of a circular antenna array with equal amplitude and in-phase patch feeding. Background Technology

[0002] Currently, common-mode antenna element theory and technology have been widely applied in mobile phones and other terminal devices, and have also attracted attention from the academic community. Circular loop antennas with equal amplitude and in-phase excitation have advantages such as low cross-polarization and high gain. However, theoretical research on antenna arrays with equal amplitude and in-phase excitation is limited, especially regarding calculations of active common-mode impedance, admittance, and VSWR. Calculating the active common-mode reflection coefficient of antenna elements can be used to determine the port matching degree under common-mode excitation, thereby determining whether the antenna meets design requirements. Therefore, research on the active common-mode reflection coefficient of antenna elements has gradually become a hot topic in the industry.

[0003] Chinese Patent Publication No. CN115548701A discloses a method for obtaining the active common-mode reflection coefficient of an equal-amplitude, in-phase excited ring antenna array, applied to a common-mode fed array antenna. The array antenna comprises N linearly arranged antenna elements, each fed by its corresponding common-mode port. The common-mode port of the m-th antenna element includes a ma port and an mb port. The active common-mode reflection coefficient of the m-th antenna element is... Among them, S mana It is the scattering parameter from single-port ma to single-port na, S mbnb It is the scattering parameter from single-port mb to single-port nb, S manb S is the scattering parameter from single-port ma to single-port nb. mbna These are the scattering parameters from a single-port mb to a single-port na, where N≥1, 1≤m≤N. This patent application provides a method for calculating the active common-mode reflection coefficient of a common-mode fed array antenna, which can determine the port matching degree under common-mode excitation, thereby determining whether the antenna meets design requirements. However, this patent makes it difficult to observe the impedance matching tuning process, nor does it reveal the relationship between the active reflection coefficients of the common-mode port and the separated port. It also requires calculating all scattering parameters under common-mode conditions, resulting in a large computational load and long processing time, which is not conducive to widespread application in engineering practice. Summary of the Invention

[0004] The technical problem to be solved by this invention is that existing methods for calculating the active common-mode reflection coefficient involve a large amount of computation and take a long time, which is not conducive to its promotion in engineering practice.

[0005] The present invention solves the above-mentioned technical problems through the following technical means: a method for obtaining parameters of a circular antenna array with equal amplitude and in-phase patch feeding, wherein the antenna array includes a metal ground plane and a plurality of equal amplitude and in-phase excited antenna elements arranged in a linear array on the metal ground plane, the antenna elements having a common-mode port, each common-mode port including two single ports, the active common-mode reflection coefficient of the common-mode port of the antenna element is equal to half of the sum of the common-mode reflection coefficients of the two single ports, the common-mode reflection coefficient of the single port is calculated first, and the active common-mode reflection coefficient of the common-mode port is indirectly obtained.

[0006] Beneficial effects: This invention provides the conclusion that the active common-mode reflection coefficient of the common-mode port of an antenna element is equal to half the sum of the common-mode reflection coefficients of the two single-ports. The active common-mode reflection coefficient of the single-port is calculated first, and the active common-mode reflection coefficient of the common-mode port is obtained indirectly, thereby simplifying the calculation process, reducing the amount of calculation, and shortening the time consumption, which is conducive to its promotion and application in engineering practice.

[0007] Furthermore, the antenna unit includes a circular radiating metal patch and two feeding metal patches. The two feeding metal patches are distributed parallel to each other on the circular radiating metal patch, and from a top-view perspective, both feeding metal patches are tangent to the inner diameter of the radiating metal patch.

[0008] Furthermore, the feeding metal patch is an L-shaped structure with its long side and short side vertically fixedly connected. The right-angle opening of the L-shaped structure faces the radiation surface of the radiating metal patch, and the short side is vertically fixed on the radiating metal patch, while the long side is suspended. From a top-down perspective, the long side of both feeding metal patches is tangent to the inner diameter of the radiating metal patch.

[0009] Furthermore, a single port is provided on the short side of each of the two feed metal patches of the antenna unit, and the two single ports of an antenna unit form the common-mode port of the antenna unit.

[0010] Furthermore, the S-parameter matrix of the circular antenna array is:

[0011]

[0012] Among them, a cN For a differential input wave received by a single port in common-mode port N, b cN S is the differential transmitted wave reflected outward from another single port of the common-mode port N. ccmn It is the common-mode reflection coefficient from common-mode port m to common-mode port n, and S ccmn =0.5·(S) mana +S mbnb +S manb +S mbna ), S manaIt is the scattering parameter from single-port ma to single-port na, S mbnb It is the scattering parameter from single-port mb to single-port nb, S manb S is the scattering parameter from single-port ma to single-port nb. mbna These are the scattering parameters from a single-port mb to a single-port na.

[0013] Furthermore, the active common-mode reflection coefficient of the circular antenna array is

[0014]

[0015] Furthermore, the active common-mode reflection coefficient of the common-mode port of the antenna element is equal to half the sum of the active reflection coefficients of the two single-port elements. The derivation process is as follows:

[0016]

[0017] Furthermore, the active common-mode impedance of the circular antenna array is

[0018]

[0019] in, This indicates common-mode impedance.

[0020] Furthermore, the active common-mode admittance of the circular antenna array is

[0021]

[0022] in, This indicates the common model's sexual orientation.

[0023] Furthermore, the active common-mode VSWR of the circular antenna array is

[0024]

[0025] The advantages of this invention are:

[0026] (1) This invention gives the conclusion that the active common-mode reflection coefficient of the common-mode port of the antenna element is equal to half of the sum of the common-mode reflection coefficients of the two single ports. The active common-mode reflection coefficient of the single port is calculated first, and the active common-mode reflection coefficient of the common-mode port is indirectly obtained, thereby simplifying the calculation process, reducing the amount of calculation, and shortening the time consumption, which is conducive to the promotion and application in engineering practice.

[0027] (2) The active common-mode impedance calculation formula proposed in this invention makes it easier to observe the dynamic process of impedance tuning and increases the degree of freedom in matching design optimization. Attached Figure Description

[0028] Figure 1This is a three-dimensional structural diagram of the circular antenna array in the parameter acquisition method of the equal amplitude and in phase patch-fed circular antenna array provided in an embodiment of the present invention.

[0029] Figure 2 This is a side view of the circular antenna array in a parameter acquisition method for a patch-fed circular antenna array with equal amplitude and in-phase power provided in an embodiment of the present invention.

[0030] Figure 3 This is a top view of the circular antenna array in the parameter acquisition method of a patch-fed circular antenna array with equal amplitude and in-phase power provided in an embodiment of the present invention.

[0031] Figure 4 The active common-mode reflection curve of the circular antenna array in the parameter acquisition method of the equal amplitude and in-phase patch-fed circular antenna array provided in the embodiment of the present invention;

[0032] Figure 5 The active common-mode impedance curve of the circular antenna array is provided in the parameter acquisition method of the equal amplitude and in-phase patch-fed circular antenna array provided in the embodiment of the present invention.

[0033] Figure 6 The active common-mode admittance curve of the circular antenna array in the parameter acquisition method of the equal-amplitude and in-phase patch-fed circular antenna array provided in the embodiment of the present invention;

[0034] Figure 7 The active common-mode VSWR curve of the circular antenna array in the parameter acquisition method of the equal amplitude and in-phase patch-fed circular antenna array provided in the embodiment of the present invention;

[0035] Figure 8 The radiation pattern of the circular antenna array is shown in the parameter acquisition method of the equal amplitude and in phase patch-fed circular antenna array provided in the embodiment of the present invention.

[0036] Figure 9 This is a comparison diagram of the active common-mode reflection coefficient of the common-mode port and the active reflection coefficient of the single port in a parameter acquisition method for a patch-fed circular antenna array with equal amplitude and in-phase power provided in an embodiment of the present invention. Detailed Implementation

[0037] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions of the embodiments of the present invention will be clearly and completely described below in conjunction with the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0038] like Figure 1 As shown, this invention provides a method for obtaining parameters of a circular antenna array fed by an equal-amplitude, in-phase patch. The antenna array includes a metal ground plane 1 and multiple equal-amplitude, in-phase excited antenna elements arranged linearly on the metal ground plane 1. Each antenna element includes a circular radiating metal patch 2 and two feeding metal patches 5. The two feeding metal patches 5 are distributed parallel to each other on the circular radiating metal patch 2, and from a top-view perspective, both feeding metal patches 5 are tangent to the inner diameter of the radiating metal patch 2. Specifically, the feeding metal patch 5 is an L-shaped structure with its long side and short side vertically fixedly connected. The right-angle opening of the L-shaped structure faces the radiating surface of the radiating metal patch 2, and the short side is vertically fixed to the radiating metal patch 2, while the long side is suspended. From a top-view perspective, the long side of both feeding metal patches 5 is tangent to the inner diameter of the radiating metal patch 2. Single ports 3 and 4 are respectively provided on the short sides of the two feeding metal patches 5 of the antenna element, and the two single ports 3 and 4 of an antenna element form the common-mode port of the antenna element.

[0039] The present invention, through experimental verification, concludes that the active common-mode reflection coefficient of the common-mode port of an antenna element is equal to half the sum of the common-mode reflection coefficients of the two single-port elements. Based on this conclusion, the common-mode reflection coefficient of the single-port element is calculated first, and the active common-mode reflection coefficient of the common-mode port is indirectly obtained, thereby simplifying the calculation process, reducing the computational load, and shortening the time consumption, which is beneficial for its widespread application in engineering practice.

[0040] In this embodiment, the S-parameter matrix of the circular antenna array is:

[0041]

[0042] Among them, a cN For a differential input wave received by a single port in common-mode port N, b cN S is the differential transmitted wave reflected outward from another single port of the common-mode port N. ccmn It is the common-mode reflection coefficient from common-mode port m to common-mode port n, and S ccmn =0.5·(S) mana +S mbnb +S manb +S mbna ), S mana It is the scattering parameter from single-port ma to single-port na, S mbnb It is the scattering parameter from single-port mb to single-port nb, S manb S is the scattering parameter from single-port ma to single-port nb. mbna These are the scattering parameters from a single-port mb to a single-port na.

[0043] The active common-mode reflection coefficient of the circular antenna array is

[0044]

[0045] In this embodiment, the active common-mode reflection coefficient of the common-mode port of the antenna element is equal to half the sum of the active reflection coefficients of the two single ports. The derivation process is as follows:

[0046]

[0047] In this embodiment, the active common-mode impedance of the circular antenna array is

[0048]

[0049] in, This indicates common-mode impedance.

[0050] In this embodiment, the active common-mode admittance of the circular antenna array is

[0051]

[0052] in, This indicates the common model's sexual orientation.

[0053] In this embodiment, the active common-mode VSWR of the circular antenna array is:

[0054]

[0055] The above presents a method for calculating the active common-mode impedance, admittance, and VSWR of an equal-amplitude, in-phase excited antenna array. This method is simple and effective, and can reflect the performance of parameters such as active common-mode impedance, active common-mode admittance, and active common-mode VSWR of the common-mode antenna array relatively well, which is convenient for analyzing the impedance matching characteristics of the common-mode array antenna.

[0056] like Figures 1 to 3 As shown, this invention provides a model of a three-element, equal-amplitude, in-phase, metal patch-excited circular antenna array. The radiating metal patches of the circular antenna are placed on a metal ground plane with a height h = 5 mm. Single-ports 3 and 4 form a common-mode port. The inner diameter R2 = 30 mm, the outer diameter R1 = 80 mm, and the spacing D between the circular antenna elements is... x =70mm, the length L of the power supply metal patch 5 x =15mm, width L y =3mm, the distance g between the power supply metal patch 5 and the radiation metal patch 2 is 0.5mm.

[0057] Figure 4 This is the active common-mode reflection curve of a three-element, equal-amplitude, in-phase metal patch-excited circular antenna array disclosed in an embodiment of the present invention; due to reciprocity and symmetry, Figure 2The common-mode port of the first antenna element from left to right in the middle is... Figure 2 The common-mode port parameters of the third antenna element from the left are the same, so the active common-mode reflection curves are the same.

[0058] Figure 5 This is the active common-mode impedance curve of a three-element, equal-amplitude, in-phase metal patch-excited circular antenna array disclosed in an embodiment of the present invention; due to reciprocity and symmetry, Figure 2 The common-mode port of the first antenna element from left to right in the middle is... Figure 2 The common-mode port parameters of the third antenna element from the left are the same, so the active common-mode impedance curves are the same.

[0059] Figure 6 This is the active common-mode admittance curve of a three-element, equal-amplitude, in-phase metal patch-excited circular antenna array disclosed in an embodiment of the present invention; due to reciprocity and symmetry, Figure 2 The common-mode port of the first antenna element from left to right in the middle is... Figure 2 The common-mode port parameters of the third antenna element from the left are the same, so the active common-mode admittance curves are the same.

[0060] Figure 7 The active common-mode VSWR curve of a three-element, equal-amplitude, in-phase metal patch-excited circular antenna array disclosed in an embodiment of the present invention;

[0061] Figure 8 This is the radiation pattern of a three-element, equal-amplitude, in-phase metal patch-excited circular antenna array disclosed in an embodiment of the present invention. This pattern demonstrates excellent performance in common-mode excitation, exhibiting good cross-polarization and high gain. The gain of the three elements reaches 14.3 dBi, and the cross-polarization of the main beam is less than -40 dB.

[0062] Figure 9 The active common-mode reflection coefficient of the common-mode port (1) of the three-element equal-amplitude in-phase metal patch-excited circular antenna array disclosed in this embodiment of the invention is compared to half the sum of the active reflection coefficients of single ports 1a and 1b, and the active common-mode reflection coefficient of the common-mode port (2) is compared to half the sum of the active reflection coefficients of single ports 2a and 2b. It can be found that the results are the same, which also proves the correctness of the previous formula derivation. Figure 2 The common-mode port of the first antenna element from left to right in the middle is... Figure 2 The common-mode port of the third antenna element from the left has structural symmetry, so the simulation results are consistent, and no curve comparison is given in the figure.

[0063] The above embodiments are only used to illustrate the technical solutions of the present invention, and are not intended to limit it. Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A method for obtaining parameters of a circular ring antenna array with equal amplitude and in-phase patch feeding, characterized in that, The antenna array includes a metallic ground plane and multiple linearly arranged, equally amplitude and in-phase excited antenna elements disposed on the metallic ground plane. Each antenna element has a common-mode port, and each common-mode port includes two single-mode ports. The active common-mode reflection coefficient of the common-mode port of an antenna element is equal to half the sum of the common-mode reflection coefficients of the two single-mode ports. The common-mode reflection coefficient of the single-mode ports is calculated first, and the active common-mode reflection coefficient of the common-mode port is indirectly obtained. Each antenna element includes a circular radiating metal patch and two feeding metal patches, with the two feeding metal patches distributed parallel to each other. On a circular radiating metal patch, both feed metal patches are tangent to the inner diameter of the radiating metal patch when viewed from above. The feed metal patch is an L-shaped structure with its long and short sides vertically fixedly connected. The right-angle opening of the L-shaped structure faces the radiating surface of the radiating metal patch, and the short side is vertically fixed to the radiating metal patch, while the long side is suspended. When viewed from above, the long side of both feed metal patches is tangent to the inner diameter of the radiating metal patch. A single port is provided on the short side of each of the two feed metal patches of the antenna element. The two single ports of an antenna element form the common-mode port of the antenna element.

2. The method for obtaining parameters of a circular antenna array with equal amplitude and in-phase patch feeding according to claim 1, characterized in that, The S-parameter matrix of the circular antenna array is: in, For common mode port A differential input wave received by a single port. For common mode port Another differentially emitted wave reflected outward from the single port, It is a common-mode port m to common mode port n common-mode reflection coefficient and , It is a single port To a single port scattering parameters, It is a single port To a single port scattering parameters, It is a single port To a single port scattering parameters, It is a single port To a single port The scattering parameters.

3. The method for obtaining parameters of a circular antenna array with equal amplitude and in-phase patch feeding according to claim 2, characterized in that, The active common-mode reflection coefficient of the circular antenna array is 。 4. The method for obtaining parameters of a circular antenna array with equal amplitude and in-phase patch feeding according to claim 3, characterized in that, The active common-mode reflection coefficient of the common-mode port of the antenna element is equal to half the sum of the common-mode reflection coefficients of the two single-port elements. The derivation process is as follows: 。 5. The method for obtaining parameters of a circular antenna array with equal amplitude and in-phase patch feeding according to claim 3, characterized in that, The active common-mode impedance of the circular antenna array is in, This indicates common-mode impedance.

6. The method for obtaining parameters of a circular antenna array with equal amplitude and in-phase patch feeding according to claim 3, characterized in that, The active common-mode admittance of the circular antenna array is in, This indicates the common model's sexual orientation.

7. The method for obtaining parameters of a circular antenna array with equal amplitude and in-phase patch feeding according to claim 3, characterized in that, The active common-mode VSWR of the circular antenna array is: 。

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