UHF helical antenna for conference system

Abstract

The utility model discloses a UHF helical antenna for a conference system. The UHF helical antenna comprises a helical antenna body and a PCB. The helical antenna main body is arranged on two sides of the PCB, and the helical antenna main body and the PCB are connected with each other; two groups of 18nH inductors and 3pF capacitors are oppositely arranged on the PCB, so that an antenna balun circuit is formed, and the phase difference between the two helical antenna main bodies is 180 degrees through the antenna balun circuit. The antenna provided by the utility model has a good impedance characteristic, the radiation performance of the antenna can be improved in some complex environments, the long-distance communication requirement is realized, and the antenna can be widely applied to UHF frequency range conference system communication.

Description

Technical Field

[0001] The utility model relates to the field of UHF conference system wireless communication, in particular to a UHF helical antenna used in a conference system. Background Art

[0002] With the progress of the times and the development of radio technology, conference systems are bound to develop in the direction of wireless conference systems. Conference systems are necessary tools for conferences. They effectively use the equipment of the conference system and cooperate with the layout of the antenna to make the conference system more efficient and orderly. The antenna of the utility model is a UHF helical antenna for the conference system. It can be installed in various communication equipment of the conference system (such as microphones, loudspeakers, desktop microphones, sound systems, etc.) to achieve wireless communication requirements of the conference. Utility Model Content

[0003] The technical problem to be solved by the present invention is to provide a UHF helical antenna for conference systems. Compared with traditional monopole and dipole antennas, the performance and communication distance in small spaces and complex environments are greatly improved. When used in professional wireless transmission projects, the signal has almost no obvious fading phenomenon in the most complex performance or conference environment, so it can provide a longer transmission distance, anti-interference characteristics and the most stable signal reception effect.

[0004] The UHF helical antenna for a conference system of the utility model is realized by the following technical solution, including a helical antenna body and a PCB board;

[0005] The helical antenna body is arranged on both sides of the PCB board, and the helical antenna body and the PCB board are interconnected; two groups of 18nH inductors and 3pF capacitors are arranged relatively on the PCB board to form an antenna balun circuit, and the phase difference of the two helical antenna bodies is set by 180° through the antenna balun circuit.

[0006] As a preferred technical solution, both sides of the PPCB are connected with electronic wires, and the other end of the electronic wires is connected to the helical antenna body.

[0007] As a preferred technical solution, a welding pad is provided at the connection between the PPCB board and the electronic wire, and the electronic wire is welded on the welding pad.

[0008] As a preferred technical solution, the P helical antenna body is connected to the electronic wire by welding, and a heat shrink tube is provided at the welding point to prevent short circuit with other peripheral circuits.

[0009] As a preferred technical solution, a coaxial cable is also connected to the center of the PCB board.

[0010] As a preferred technical solution, the thickness of the PCB board is 1 mm, the material is FR4, the relative dielectric constant is 4.4, and the loss tangent is 0.02.

[0011] The beneficial effects of the utility model are:

[0012] The antenna of this utility model adopts spiral antenna form at both ends, with a symmetrical structure at both ends, forming a dipole antenna. In conjunction with the balun circuit, it achieves good impedance matching and broadband characteristics of the antenna. It solves the communication requirements of conference systems in small spaces and complex environments.

[0013] Compared with traditional monopole and dipole antennas, this new antenna has greatly improved performance and communication distance in small spaces and complex environments. When used in professional wireless transmission projects, it can be used in the most complex performance or conference environments with almost no obvious signal fading, thus providing a longer transmission distance, anti-interference characteristics and the most stable signal reception effect.

[0014] The antenna of the present invention has good impedance characteristics, can improve the antenna radiation performance in some complex environments, meet the requirements of long-distance communication, and can be widely used in UHF frequency band conference system communications. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0016] Figure 1 It is a schematic diagram of the three-dimensional structure of the utility model;

[0017] Figure 2 This is a schematic diagram of the planar structure of the utility model;

[0018] Figure 3 This is a diagram showing the return loss simulation results of the antenna S11 of the present invention;

[0019] Figure 4 This is a simulation result diagram of the voltage standing wave ratio of the antenna of the utility model;

[0020] Figure 5 These are the simulation results of the 2D and 3D radiation patterns of the antenna of this utility model.

[0021] Description of reference numerals:

[0022] 1. Helical antenna body; 2. Heat shrink tubing; 3. Electronic wire; 4. 18nH inductor; 5. 3pF capacitor; 6. PCB board; 7. Coaxial cable; 8. Solder pad. DETAILED DESCRIPTION

[0023] All features disclosed in this specification, or all steps in the disclosed methods or processes, except mutually exclusive features and / or steps, can be combined in any manner.

[0024] like Figures 1-4 As shown, the UHF helical antenna for a conference system of the present invention includes a helical antenna body 1 and a PCB board 6;

[0025] The helical antenna body 1 is arranged on both sides of the PCB board 6, and the helical antenna body 1 and the PCB board 6 are interconnected; two groups of 18nH inductors 4 and 3pF capacitors 5 are relatively arranged on the PCB board 6 to form an antenna balun circuit. The antenna balun circuit is used to make the phase difference of the two helical antenna bodies 1 180°. When the two paths are combined, the theoretical gain value can be increased by 3dbi.

[0026] Both sides of the PCB board 6 are connected to the electronic wire 3 , and the other end of the electronic wire 3 is connected to the helical antenna body 1 .

[0027] The utility model can achieve the requirement of covering any frequency point in the UHF band of 400-1000MHz by adjusting the diameter, spacing and number of turns of the spiral antenna body; adjusting the length and diameter of the electronic wire; and adjusting the size of the 18nH inductor and 3pF capacitor of the balun circuit.

[0028] In order to achieve a stable connection of the helical antenna body, in this embodiment, a welding pad 8 is provided at the connection between the PCB board 6 and the electronic wire 3 , and the electronic wire 3 is welded on the welding pad 8 .

[0029] In order to prevent short circuits with other peripheral circuits, in this embodiment, the helical antenna body 1 and the electronic wire 3 are welded together, and a heat shrink tube 2 is provided at the welding point to prevent short circuits with other peripheral circuits.

[0030] In order to achieve the connection between the PCB board and the outside, in this embodiment, a coaxial cable 7 is further connected to the center of the PCB board 6.

[0031] In addition, the thickness of the PCB board 6 is 1 mm, the material is FR4, the relative dielectric constant is 4.4, and the loss tangent is 0.02.

[0032] The antenna of this utility model adopts spiral antenna form at both ends, with a symmetrical structure at both ends, forming a dipole antenna. In conjunction with the balun circuit, it achieves good impedance matching and broadband characteristics of the antenna. It solves the communication requirements of conference systems in small spaces and complex environments.

[0033] Compared with traditional monopole and dipole antennas, this new antenna has greatly improved performance and communication distance in small spaces and complex environments. When used in professional wireless transmission projects, it can be used in the most complex performance or conference environments with almost no obvious signal fading, thus providing a longer transmission distance, anti-interference characteristics and the most stable signal reception effect.

[0034] The antenna of the present invention has good impedance characteristics, can improve the antenna radiation performance in some complex environments, meet the requirements of long-distance communication, and can be widely used in UHF frequency band conference system communications.

[0035] The above description is merely a specific embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any changes or substitutions that do not require creative effort should be included within the scope of protection of the present invention. Therefore, the scope of protection of the present invention should be based on the scope of protection defined in the claims.

Claims

1. A UHF helical antenna for a conference system, characterized by: It comprises a helical antenna body (1) and a PCB board (6); The helical antenna body (1) is arranged on both sides of a PCB board (6), and the helical antenna body (1) and the PCB board (6) are connected to each other; two groups of 18nH inductors (4) and 3pF capacitors (5) are arranged on the PCB board (6) to form an antenna balun circuit, and the phase difference between the two helical antenna bodies (1) is 180 degrees through the antenna balun circuit.

2. The UHF helical antenna for a conference system according to claim 1, characterized in that: Both sides of the PCB board (6) are connected to an electronic wire (3), and the other end of the electronic wire (3) is connected to the helical antenna body (1).

3. The UHF helical antenna for a conference system according to claim 1, characterized in that: A welding pad (8) is provided at the connection between the PCB board (6) and the electronic wire (3), and the electronic wire (3) is welded on the welding pad (8).

4. The UHF helical antenna for a conference system according to claim 1, characterized in that: The helical antenna body (1) and the electronic wire (3) are connected by welding, and a heat shrink tube (2) is provided at the welding point to prevent short circuit with other peripheral circuits.

5. The UHF helical antenna for a conference system according to claim 1, characterized in that: A coaxial cable (7) is also connected to the center of the PCB board (6).

6. The UHF helical antenna for a conference system according to claim 1, characterized in that: The PCB board (6) has a thickness of 1 mm, is made of FR4, has a relative dielectric constant of 4.4, and a loss tangent of 0.02.

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