Circularly polarized log-periodic antenna

Abstract

The application discloses a circularly polarized logarithmic periodic antenna and belongs to the technical field of antennas. The circularly polarized logarithmic periodic antenna comprises parallel double lines, a main vibrator group arranged on the parallel double lines, a sub-vibrator group arranged on the parallel double lines, a radio frequency connector arranged at one end of the parallel double lines and a radio frequency cable connected with the radio frequency connector. The main vibrator group and the sub-vibrator group are distributed along the length direction of the parallel double lines, and the length of each vibrator in the main vibrator group and the sub-vibrator group is gradually increased along the distribution direction. The main vibrator group and the sub-vibrator group form a 90-degree angle, and each vibrator in the main vibrator group and the sub-vibrator group forms a 45-degree angle with the plane where the parallel double lines are located. The main vibrator group and the sub-vibrator group are assembled to form a 90-degree angle, and each vibrator in the main vibrator group and the sub-vibrator group forms a 45-degree angle with the plane where the parallel double lines are located. The structure makes the electromagnetic waves radiated by the main vibrator and the corresponding sub-vibrator to the antenna zero point have a certain phase difference, thereby realizing circular polarization.

Description

TECHNICAL FIELD

[0001] The present application relates to a circularly polarized logarithmic periodic antenna, belonging to the technical field of antennas. BACKGROUND

[0002] At present, the common circularly polarized logarithmic periodic antenna design scheme mostly adopts a double-main-pole (corresponding to double-output-port) structure, and a user uses a bridge to convert one signal into two signals with a phase difference of 90 degrees, and then connects the two signals with the antenna double port to realize the circular polarization requirement of the antenna. This way is complex and cumbersome in structure, inconvenient to use and operate, and increases the processing and use cost. There is also a phase shift way through structure, which can no longer add a 90-degree bridge, but still adopts a double-main-pole structure, resulting in a complex and cumbersome overall structure. SUMMARY

[0003] The present application aims to overcome the deficiencies in the prior art, and provides a circularly polarized logarithmic periodic antenna, which solves the problem of complex and cumbersome overall structure caused by the double-main-pole structure in the current logarithmic periodic antenna when realizing circular polarization.

[0004] To achieve the above-mentioned purpose / to solve the above-mentioned technical problems, the present application is realized by adopting the following technical scheme:

[0005] A circularly polarized logarithmic periodic antenna, comprising parallel double lines, a main vibrator group arranged on the parallel double lines, a sub-vibrator group arranged on the parallel double lines, a radio frequency connector arranged at one end of the parallel double lines, and a radio frequency cable connected with the radio frequency connector;

[0006] The main vibrator group and the sub-vibrator group are distributed along the length direction of the parallel double lines, and the length of each vibrator in the main vibrator group and the sub-vibrator group increases along the distribution direction; the main vibrator group and the sub-vibrator group form a 90-degree angle, and each vibrator in the main vibrator group and the sub-vibrator group forms a 45-degree angle with the plane in which the parallel double lines are located.

[0007] Optionally, the length and position of each vibrator in the main vibrator group are determined according to a logarithmic relationship of frequency, the length and position of each vibrator in the sub-vibrator group are determined according to the same logarithmic relationship as the main vibrator group, and the number of vibrators in the sub-vibrator group is the same as and one-to-one corresponds to the number of vibrators in the main vibrator group.

[0008] Optionally, the logarithmic relationship is that the length ratio of adjacent vibrators in the sub-vibrator group or the main vibrator group is a proportion factor K, and the vibrator spacing ratio of adjacent vibrators in the sub-vibrator group or the main vibrator group is the proportion factor K.

[0009] Optionally, the proportion factor K has a value range of 0.6-0.9.

[0010] Optionally, the parallel double line comprises a first antenna main rod and a second antenna main rod; a first flange is installed at the top end of the first antenna main rod, and a second flange is installed at the bottom end of the first antenna main rod; a third flange is installed at the top end of the second antenna main rod, and a fourth flange is installed at the bottom end of the second antenna main rod.

[0011] Optionally, the radio frequency connector is connected with the second flange, a dielectric column is installed on the first flange; one end of the radio frequency cable is connected with the output end of the radio frequency connector, and the other end of the radio frequency cable passes through the dielectric column and is connected with the third flange.

[0012] Compared with the prior art, the present application has the following beneficial effects:

[0013] 1. The main oscillator group and the auxiliary oscillator group are arranged on the parallel double line, the main oscillator group and the auxiliary oscillator group are assembled at an angle of 90 degrees, and each oscillator in the main oscillator group and the auxiliary oscillator group is at an angle of 45 degrees with the plane of the parallel double line, so that the electromagnetic waves radiated by the main oscillator and the corresponding auxiliary oscillator to the antenna zero point have a certain phase difference, circular polarization is realized, the double main rod structure and the electric bridge form are avoided, and the problem that the double main rod structure is used when the logarithmic periodic antenna realizes circular polarization, resulting in a complex and heavy overall structure, is solved.

[0014] 2. The radio frequency connector is installed at the bottom end of the first antenna main rod of the parallel double line, and the radio frequency cable is used to connect the radio frequency connector with the third flange at the top end of the second antenna main rod of the parallel double line, that is, the radio frequency connector is extended from the long oscillator end to the short oscillator end of the parallel double line through the radio frequency cable, and the second antenna main rod is excited through the third flange. BRIEF DESCRIPTION OF DRAWINGS

[0015] Figure 1 is a whole structure schematic diagram of a circularly polarized logarithmic periodic antenna provided by the embodiment of the present application;

[0016] Figure 2 is a vibrator length and position relationship diagram of a circularly polarized logarithmic periodic antenna provided by the embodiment of the present application;

[0017] Figure 3 is a left circularly polarized structure schematic diagram of a circularly polarized logarithmic periodic antenna provided by the embodiment of the present application;

[0018] Figure 4 is a right circularly polarized structure schematic diagram of a circularly polarized logarithmic periodic antenna provided by the embodiment of the present application;

[0019] Figure 5 is a top structure schematic diagram of a parallel double line of a circularly polarized logarithmic periodic antenna provided by the embodiment of the present application;

[0020] Figure 6is a bottom structure schematic diagram of parallel double lines of a circularly polarized logarithmic periodic antenna provided by an embodiment of the present application;

[0021] Figure 7 is a top structure schematic diagram of parallel double lines of a circularly polarized logarithmic periodic antenna provided by an embodiment of the present application.

[0022] In the figure: 1, parallel double lines; 101, first antenna main rod; 102, second antenna main rod; 2, main dipole group; 3, auxiliary dipole group; 4, radio frequency connector; 5, radio frequency cable; 6, first flange; 7, second flange; 8, third flange; 9, fourth flange; 10, dielectric column. DETAILED DESCRIPTION

[0023] The present application will be further described below in conjunction with the accompanying drawings. The following embodiments are only used to more clearly illustrate the technical solutions of the present application, and cannot be used to limit the protection scope of the present application.

[0024] In the description of the present application, it should be understood that the terms "center", "longitudinal", "transverse", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer" and the like indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, and are only used to facilitate the description of the present application and simplify the description, and therefore cannot be understood as indicating or implying that the devices or elements indicated must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as limiting the present application. In addition, the terms "first", "second" and the like are only used for description purposes and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the technical features indicated. Therefore, the features defined with "first", "second" and the like can explicitly or implicitly include one or more of the features.

[0025] In the description of the present application, it should be noted that unless otherwise explicitly specified and limited, the terms "mounting", "connecting", "connection" should be understood broadly, for example, it can be fixed connection, or detachable connection, or integrally connected; it can be mechanical connection, or electrical connection; it can be directly connected, or indirectly connected through an intermediate medium; it can be the communication inside two elements. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances. EMBODIMENT

[0026] As Figure 1 shown, a circularly polarized logarithmic periodic antenna includes parallel double lines 1, main dipole group 2, auxiliary dipole group 3, radio frequency connector 4 and radio frequency cable 5; the parallel double lines 1 include first antenna main rod 101 and second antenna main rod 102, the first antenna main rod 101 is parallel to the second antenna main rod 102;

[0027] As shown in Figure 1 and Figure 7 , the main vibrator group 2 and the auxiliary vibrator group 3 are distributed along the length direction of the parallel double line 1, the length of each vibrator in the main vibrator group 2 and the auxiliary vibrator group 3 is increased along the direction from the top end to the bottom end of the parallel double line 1, the main vibrator group 2 and the auxiliary vibrator group 3 form a 90-degree angle, each vibrator in the main vibrator group 2 is installed on the first antenna main rod 101 and the second antenna main rod 102, each vibrator in the auxiliary vibrator group 3 is installed on the first antenna main rod 101 and the second antenna main rod 102, and each vibrator in the main vibrator group 2 and the auxiliary vibrator group 3 forms a 45-degree angle with the plane in which the parallel double line 1 is located;

[0028] As shown in Figure 2 , the length and position of each vibrator in the main vibrator group 2 are determined according to the logarithmic relationship of the frequency, the length and position of each vibrator in the auxiliary vibrator group 3 are determined according to the same logarithmic relationship as the main vibrator group 2, and the number of vibrators in the auxiliary vibrator group 3 is the same as and one-to-one corresponds to the number of vibrators in the main vibrator group 2; the position in the figure is the distance from the antenna zero point to the installation position of each vibrator rod, and the antenna zero point is the intersection of the line connecting the top points of the vibrators at the same height in the same vibrator group and the antenna main rod;

[0029] The logarithmic relationship of the antenna is that the length ratio of adjacent vibrators in the auxiliary vibrator group 3 or the main vibrator group 2 is a proportion factor K, the vibrator spacing ratio of adjacent vibrators in the auxiliary vibrator group 3 or the main vibrator group 2 is a proportion factor K, and the value range of the proportion factor K is 0.6-0.9. Since there is a certain phase difference between the electromagnetic waves radiated by each vibrator in the main vibrator group 2 and the corresponding auxiliary vibrator group 3 to the antenna zero point, and the phase difference is proportional to the distance between the main and auxiliary vibrators, the circular polarization characteristic of the antenna can be realized according to the structure phase shift principle. When the signal propagates from the short vibrator end to each vibrator rod along the parallel double line 1, each vibrator rod is excited and radiates to the short vibrator end along the air, the signal radiated by the auxiliary vibrator is less than the signal radiated by the corresponding main vibrator by twice the main and auxiliary vibrator spacing, and a certain phase difference occurs between the two electromagnetic waves. When the phase difference is 90 degrees, the antenna can realize the circular polarization characteristic;

[0030] As shown in Figure 3 and Figure 4 , each main vibrator in the main vibrator group 2 is installed on the opposite axial side of the first antenna main rod 101 and the second antenna main rod 102, so that the left / right circular polarization conversion can be realized.

[0031] As shown in Figure 5 and Figure 6As shown, the top end of the first antenna main rod 101 is provided with a first flange 6, and the bottom end is provided with a second flange 7; the top end of the second antenna main rod 102 is provided with a third flange 8, and the bottom end is provided with a fourth flange 9; the radio frequency connector 4 is connected with the second flange 7; the first flange 6 is provided with a dielectric column 10, the top end of which is fixedly connected with the left side of the bottom of the third flange 8; one end of the radio frequency cable 5 is connected with the output end of the radio frequency connector 4, and the other end is connected with the third flange 8 through the dielectric column 10; the radio frequency connector 4 extends to the short vibrator end from the long vibrator end of the parallel double line 1 through the radio frequency cable 5, and excites the second antenna main rod 102 through the third flange 8.

[0032] The above description is only the preferred embodiment of the present application, and it should be pointed out that, for those skilled in the art, some improvements and modifications can be made without departing from the technical principles of the present application, and these improvements and modifications should also be considered as the protection scope of the present application.

Claims

1. A circularly polarized log-periodic antenna, characterized in that, It includes a parallel double line, a main oscillator group set on the parallel double line, a secondary oscillator group set on the parallel double line, an RF connector set at one end of the parallel double line, and an RF cable connected to the RF connector. The main oscillator group and the auxiliary oscillator group are distributed along the length direction of the parallel double lines, and the length of each oscillator in the main oscillator group and the auxiliary oscillator group increases along the distribution direction; the main oscillator group and the auxiliary oscillator group form a 90-degree angle, and each oscillator in the main oscillator group and the auxiliary oscillator group forms a 45-degree angle with the plane containing the parallel double lines; The length and position of each oscillator in the main oscillator group are determined according to the logarithmic relationship of the frequency. The length and position of each oscillator in the secondary oscillator group are determined according to the same logarithmic relationship as that in the main oscillator group. The number of oscillators in the secondary oscillator group is the same as the number of oscillators in the main oscillator group and they correspond one-to-one. The parallel double line includes a first antenna main rod and a second antenna main rod; a first flange is installed at the top of the first antenna main rod and a second flange is installed at the bottom; a third flange is installed at the top of the second antenna main rod and a fourth flange is installed at the bottom. The RF connector is connected to the second flange, and a dielectric post is installed on the first flange; one end of the RF cable is connected to the output end of the RF connector, and the other end passes through the dielectric post and is connected to the third flange.

2. The circularly polarized log-periodic antenna according to claim 1, characterized in that, The logarithmic relationship is as follows: the ratio of the lengths of adjacent oscillators in the sub-oscillator group or the main oscillator group is the scaling factor K, and the ratio of the spacing between adjacent oscillators in the sub-oscillator group or the main oscillator group is the scaling factor K.

3. A circularly polarized log-periodic antenna according to claim 2, characterized in that, The scaling factor K ranges from 0.6 to 0.9.

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