Double-frequency broadband four-arm helical antenna

Abstract

The utility model discloses a double-frequency broadband four-arm helical antenna, which comprises a reflecting plate and four helical arms, each helical arm has the same structure and is distributed on a regular polygon carrier in a central symmetry manner, each helical arm is divided into two parts, namely a first part and a second part, a filter is connected between the first part and the second part, and the first part is connected with the second part through a first antenna. The first component corresponds to a high frequency F2, the first component and the second component are combined to correspond to a low frequency F1, and the filter has a band-stop effect on the high frequency F2 and a low-stop band-pass effect on the low frequency F1. Under the condition that the size of the antenna is reduced, the broadband dual-frequency design of the antenna is realized by using only four radiation arms, the bandwidth is wide, and the performance and the working efficiency of the antenna are greatly improved; meanwhile, the antenna is simple in structure, low in cost, suitable for industrial production, capable of saving production cost and easy to popularize.

Description

Technical Field

[0001] The utility model relates to the technical field of wireless communication, in particular to a dual-frequency broadband four-arm helical antenna. Background Art

[0002] The antenna is a key unit on the satellite navigation system terminal. The satellite navigation system terminal receives the electromagnetic wave signal transmitted by the navigation satellite through the antenna and provides it to the RF front-end processing on the terminal to obtain the navigation satellite signal and related data information. Therefore, the quality of the antenna performance will directly affect the normal working status of the satellite navigation system terminal.

[0003] Four-arm helical antennas are widely used in global satellite navigation systems due to their advantages such as light weight, small size, and large beam width. At present, four-arm helical antennas are widely used in the field of satellite communications. Traditional dual-frequency helical antennas either use two single-frequency helices stacked up and down or nested inside and outside; while increasing the size of the antenna, it increases the difficulty of debugging and is not conducive to miniaturization applications; or eight arms are used to achieve dual frequencies, but the spiral arms of the dual-frequency eight-arm helical antenna affect each other, resulting in low antenna gain and narrow bandwidth; therefore, in a limited space, providing a high-performance dual-frequency helical antenna can solve the current very important problem and has great value. Utility Model Content

[0004] The utility model aims to propose a dual-frequency broadband four-arm helical antenna, which is used to solve the problem that in the prior art, two single-frequency helices are stacked up and down or nested inside and outside; while increasing the volume of the antenna, it increases the difficulty of debugging, which is not conducive to miniaturized application. Eight arms are used to achieve dual-frequency, but the spiral arms of the dual-frequency eight-arm helical antenna affect each other, which will cause the problem of low antenna gain and narrow bandwidth.

[0005] The utility model proposes a dual-band broadband four-arm helical antenna, comprising: a reflector, and four helical arms, each of which has the same structure and is centrally symmetrically distributed on a regular polygonal (circular) carrier, each of which is divided into two parts, a first component and a second component, a filter is connected between the first component and the second component, the first component corresponds to a high frequency F2, and the combination of the first component and the second component corresponds to a low frequency F1, the filter has a band-stop effect on the high frequency F2, and a low-stop band-pass effect on the low frequency F1.

[0006] The dual-band broadband four-arm helical antenna of the utility model has the following advantages:

[0007] While reducing the size of the antenna, the broadband dual-band design of the antenna is realized with only four radiating arms, and the wide bandwidth greatly improves the performance and working efficiency of the antenna. At the same time, the antenna has a simple structure and low cost, which is suitable for industrial production, saves production costs, and is easy to promote. BRIEF DESCRIPTION OF THE DRAWINGS

[0008] The accompanying drawings are used to provide a further understanding of the present invention and constitute a part of the specification. Together with the embodiments of the present invention, they are used to explain the present invention and do not constitute a limitation of the present invention. In the accompanying drawings:

[0009] Figure 1 It is a schematic structural diagram of the first embodiment of the dual-frequency broadband four-arm helical antenna in the utility model.

[0010] Figure 2 Display as Figure 1 Top view of the .

[0011] Figure 3 It is a schematic structural diagram of the second embodiment of the dual-frequency broadband four-arm helical antenna in the utility model.

[0012] Figure 4 It is a schematic structural diagram of the third embodiment of the dual-frequency broadband four-arm helical antenna in the utility model.

[0013] Figure 5 Display as Figure 4 Top view of the .

[0014] Figure 6 Shown is a gain bandwidth comparison diagram of the conventional dual-frequency four-arm helix in the present invention and the present invention.

[0015] Component number description:

[0016] 100 reflecting plate; 200 spiral arm; 201 first component; 202 second component; 300 filter; 400 T-shaped structure. DETAILED DESCRIPTION

[0017] The technical solutions in the embodiments of the present invention will be described clearly and completely below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all of the embodiments.

[0018] like Figures 1 to 6 As shown, Figure 1 It is a schematic structural diagram of the first embodiment of the dual-frequency broadband four-arm helical antenna in the utility model. Figure 2 Display as Figure 1 Top view of the . Figure 3 It is a schematic structural diagram of the second embodiment of the dual-frequency broadband four-arm helical antenna in the utility model. Figure 4 It is a schematic structural diagram of the third embodiment of the dual-frequency broadband four-arm helical antenna in the utility model. Figure 5 Display as Figure 4 Top view of the . Figure 6The gain bandwidth comparison diagram of the conventional dual-frequency four-arm helix antenna in the utility model and the utility model is shown. The utility model provides a dual-frequency broadband four-arm helix antenna, comprising: a reflector 100, on which four spiral arms 200 are arranged; the four spiral arms 200 are evenly distributed. A carrier is arranged on the reflector 100, and the four spiral arms 200 are arranged on the carrier in a centrally symmetrical distribution.

[0019] The carrier is a regular polygon or a cylinder; a T-shaped structure 400 is arranged at the center of the carrier. In the first embodiment, the carrier is a cylinder, in the second embodiment, the carrier is a regular polygon, and in the third embodiment, the T-shaped structure 400 may not be arranged at the center of the carrier. Usually, the grounding structure of the T-shaped structure 400 is fixed above the reflector 100 and connected to the reflector 100, the vertical part of the T-shaped structure 400 is located at the geometric center of the helical antenna, and the horizontal part of the T-shaped structure 400 is connected to the reflector 100. The spiral arm 200 is wound around the circular carrier. In special cases, the carrier can be air, a solid medium or a hollow medium, etc., all of which are within the protection scope of this embodiment.

[0020] In the present invention, each spiral arm 200 includes a first component 201 and a second component 202, and a filter 300 is connected between the first component 201 and the second component 202. The filter 300 is connected to the horizontal part of the T-shaped structure 400, or the grounding part of the filter 300 is connected to the horizontal part of the T-shaped structure 400. The first component 201 is used to receive the high frequency F2; the first component 201 and the second component 202 are combined to receive the low frequency F1. The filter 300 has a band-stop effect on the high frequency F2 and a low-stop band-pass effect on the low frequency F1. Figure 6 It can be seen from the figure that the antenna structure provided by the utility model has obvious advantages.

[0021] The dual-band broadband four-arm helical antenna provided by the utility model realizes the broadband dual-band design of the antenna with only four radiating arms while reducing the size of the antenna. The bandwidth is wide, which greatly improves the performance and working efficiency of the antenna. At the same time, the antenna has a simple structure and low cost, is suitable for industrial production, saves production costs, and is easy to promote.

[0022] The above description is only a preferred specific implementation manner of the present invention, but the protection scope of the present invention is not limited thereto. Any technician familiar with the technical field can make equivalent replacements or changes within the technical scope disclosed by the present invention according to the technical scheme and the utility model concept of the present invention, which should be covered by the protection scope of the present invention.

Claims

1. A dual-band broadband four-arm helical antenna, characterized in that: include: The reflector and four spiral arms, each of which has the same structure, are centrally symmetrically distributed on a regular polygonal carrier, and each spiral arm is divided into two parts, a first component and a second component. A filter is connected between the first component and the second component. The first component corresponds to the high frequency F2, and the combination of the first component and the second component corresponds to the low frequency F1. The filter has a band-stop effect on the high frequency F2 and a low-stop band-pass effect on the low frequency F1.

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