A broadband balun-fed UHF band omnidirectional antenna

Abstract

This utility model discloses a broadband balun-fed UHF band omnidirectional antenna, relating to the field of wireless communication technology. It includes a main radiator, a feeding balun, an antenna housing, a parasitic radiator, and a support block. The parasitic radiator comprises a main body and a cover plate fixed together, with the main body disposed inside the antenna housing. The main radiator is in the form of a dipole. The advantages are: the parasitic radiator uses a square dipole sleeve structure to broaden the antenna's impedance bandwidth and achieve miniaturization; the feeding balun uses a Type III balun with broadband matching characteristics to achieve impedance matching of the antenna and obtain good port standing wave characteristics; the lower and upper arm radiators are thickened for stable assembly; this antenna has good omnidirectional radiation performance and standing wave bandwidth, a reasonable structural design, simple assembly, and low production cost.

Description

Technical Field

[0001] This utility model relates to the field of wireless communication technology, and in particular to a broadband balun-fed UHF band omnidirectional antenna. Background Technology

[0002] In the field of modern wireless communication technology, the VHF / UHF bands are widely used due to their good signal-to-noise ratio and high efficiency. However, because of the low frequency and long wavelength in this band, the antennas in general designs are very large, or they often use lumped component loading technology, resulting in poor omnidirectional radiation performance. Such antennas are no longer suitable for the development of modern wireless communication systems. Therefore, the demand for VHF / UHF band omnidirectional antennas with effective electrical performance is becoming increasingly urgent. Utility Model Content

[0003] The purpose of this invention is to provide a broadband balun-fed UHF band omnidirectional antenna to solve the above-mentioned problems.

[0004] This utility model achieves the above objectives through the following technical solutions:

[0005] A broadband balun-fed UHF band omnidirectional antenna includes a main radiator, a feeding balun, an antenna housing, a parasitic radiator, and support blocks. The parasitic radiator includes a main body and a cover plate fixed together. The main body is located inside the antenna housing. Two support blocks are provided and symmetrically distributed vertically inside the main body. The support blocks are fixed to the antenna housing. The main radiator is in the form of a dipole and includes a lower arm radiator and an upper arm radiator. One end of the lower arm radiator and the upper arm radiator are inserted into the support block. The feeding balun includes a feeding balun cavity, a feeding coaxial line, and a short-circuit coaxial line. The feeding balun cavity is fixed to the antenna housing. One end of the feeding coaxial line's outer conductor is fixed to the lower arm radiator. The inner conductor of the feeding coaxial line and one end of the short-circuit coaxial line are assembled together at the soldered end of the upper arm radiator. The other end of the feeding coaxial line extends out of the feeding balun cavity and is assembled with an RF connector. The other end of the short-circuit coaxial line is fixed to the bottom plate of the feeding balun cavity.

[0006] Preferably, the antenna housing includes an antenna housing body, an antenna housing side cover, and an antenna housing cover. The parasitic radiator is disposed inside the antenna housing body. The antenna housing cover is fixed to the upper and lower ends of the antenna housing body. The antenna housing side cover is fixed to one side of the antenna housing body. The support block is fixed to the antenna housing body.

[0007] Preferably, both the lower arm radiator and the upper arm radiator have welding grooves on their feed end faces for assembling the feed coaxial line and the short-circuit coaxial line.

[0008] Preferably, the lower arm radiator and upper arm radiator located between the support block and the side cover plate of the antenna housing are designed with thicker thickness.

[0009] Preferably, the parasitic radiator is a square dipole sleeve structure.

[0010] The beneficial effects are as follows: the parasitic radiator is a square dipole sleeve structure, which is used to broaden the impedance bandwidth of the antenna and achieve miniaturization; the feed balun adopts a type III balun with broadband matching characteristics to achieve impedance matching of the antenna and obtain good port standing wave characteristics; the lower arm radiator and the upper arm radiator are thickened to facilitate stable assembly; the antenna has good omnidirectional radiation performance and standing wave bandwidth; the structural design is reasonable; the assembly is simple; and the production cost is low.

[0011] The additional technical features and advantages of this utility model will become more apparent from the following description, or may be learned through specific practice of this utility model. Attached Figure Description

[0012] The accompanying drawings are provided to further illustrate the present invention and form part of the specification. They are used together with the following detailed description to explain the present invention, but do not constitute a limitation thereof. In the drawings:

[0013] Figure 1 This is a schematic diagram of a broadband balun-fed UHF band omnidirectional antenna according to the present invention;

[0014] Figure 2 This is a schematic diagram of the internal structure of a broadband balun-fed UHF band omnidirectional antenna as described in this utility model;

[0015] Figure 3 This is the omnidirectional radiation pattern of a broadband balun-fed UHF band omnidirectional antenna as described in this utility model.

[0016] The reference numerals in the attached diagrams are explained as follows: 1. Main radiator; 2. Feed balun; 3. Antenna housing; 4. Parasitic radiator; 5. Lower arm radiator; 6. Upper arm radiator; 7. Main body of parasitic radiator; 8. Cover plate of parasitic radiator; 9. Feed balun cavity; 10. Feed coaxial line; 11. Short-circuit coaxial line; 12. Main body of antenna housing; 13. Side cover plate of antenna housing; 14. Cover plate of antenna housing; 15. Support block. Detailed Implementation

[0017] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present utility model. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments.

[0018] In the description of this utility model, it should be understood that the terms "upper", "lower", "front", "rear", "left", "right", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.

[0019] The present invention will be further described below with reference to the accompanying drawings:

[0020] like Figures 1-3 As shown, a broadband balun-fed UHF band omnidirectional antenna includes a main radiator 1, a feeding balun 2, an antenna housing 3, a parasitic radiator 4, and a support block 15. The parasitic radiator 4 is a square dipole sleeve structure used to widen the impedance bandwidth of the antenna and achieve miniaturization. The parasitic radiator 4 includes a parasitic radiator body 7 and a parasitic radiator cover plate 8 fixed together by screws. The parasitic radiator body 7 is located inside the antenna housing 3. Two support blocks 15 are provided and symmetrically distributed vertically inside the parasitic radiator body 7. The support blocks 15 are fixed to the antenna housing 3. The main radiator 1 is in the form of a dipole and includes a lower arm radiator 5 and an upper arm radiator 6. One end of the lower arm radiator 5 and the upper arm radiator 6 are inserted into the support block 15, and the other end is inserted into the side cover plate 13 of the antenna housing. The support block 15 plays a role in limiting and supporting the lower arm radiator 5 and the upper arm radiator 6.

[0021] The feed balun 2 uses a Type III balun with broadband matching characteristics to achieve impedance matching of the antenna and obtain good port standing wave characteristics. The feed balun 2 includes a feed balun cavity 9, a feed coaxial line 10, and a short-circuit coaxial line 11. The feed balun cavity 9 is fixed on the antenna housing 3. One end of the outer conductor of the feed coaxial line 10 is welded to the lower arm radiator 5. The inner conductor of the feed coaxial line 10 and one end of the short-circuit coaxial line 11 are assembled together at the welding end of the upper arm radiator 6. The other end of the feed coaxial line 10 passes through the feed balun cavity 9 and is assembled with the RF connector. The other end of the short-circuit coaxial line 11 is welded to the base plate of the feed balun cavity 9.

[0022] The antenna housing 3 includes an antenna housing body 12, an antenna housing side cover 13, and an antenna housing cover 14. The parasitic radiator 4 is disposed inside the antenna housing body 12 and fixed by screws. The antenna housing cover 14 is fixed to the upper and lower ends of the antenna housing body 12. The antenna housing side cover 13 is fixed to one side of the antenna housing body 12. The support block 15 is fixed to the antenna housing body 12 by screws.

[0023] Both the lower arm radiator 5 and the upper arm radiator 6 have welding grooves on their feed end faces for welding and assembling the feed coaxial line 10 and the short-circuit coaxial line 11.

[0024] The lower arm radiator 5 and the upper arm radiator 6, located between the support block 15 and the antenna housing side cover plate 13, are designed with thicker reinforcement to facilitate stable assembly of the lower arm radiator 5 and the upper arm radiator 6.

[0025] The foregoing has shown and described the basic principles, main features, and advantages of this utility model. Those skilled in the art should understand that this utility model is not limited to the above embodiments. The embodiments and descriptions in the specification are merely illustrative of the principles of this utility model. Various changes and modifications can be made to this utility model without departing from its spirit and scope, and all such changes and modifications fall within the scope of the claimed utility model.

Claims

1. A broadband balun-fed UHF band omnidirectional antenna, characterized in that: The antenna housing includes a main radiator (1), a feed balun (2), an antenna housing (3), a parasitic radiator (4), and a support block (15). The parasitic radiator (4) includes a parasitic radiator body (7) and a parasitic radiator cover plate (8) fixed together. The parasitic radiator body (7) is located inside the antenna housing (3). There are two support blocks (15) which are symmetrically distributed inside the parasitic radiator body (7) and are fixed to the antenna housing (3). The main radiator (1) is in the form of a dipole and includes a lower arm radiator (5) and an upper arm radiator (6). One end of the device (6) is inserted into the support block (15). The feed balun (2) includes a feed balun cavity (9), a feed coaxial line (10), and a short-circuit coaxial line (11). The feed balun cavity (9) is fixed on the antenna housing (3). One end of the feed coaxial line (10) is fixed to the lower arm radiator (5). The inner conductor of the feed coaxial line (10) and one end of the short-circuit coaxial line (11) are assembled together on the welding end of the upper arm radiator (6). The other end of the feed coaxial line (10) passes through the feed balun cavity (9) and is assembled with the radio frequency connector. The other end of the short-circuit coaxial line (11) is fixed on the bottom plate of the feed balun cavity (9).

2. The broadband balun-fed UHF band omnidirectional antenna according to claim 1, characterized in that: The antenna housing (3) includes an antenna housing body (12), an antenna housing side cover (13), and an antenna housing cover (14). The parasitic radiator (4) is located inside the antenna housing body (12). The antenna housing cover (14) is fixed to the upper and lower ends of the antenna housing body (12). The antenna housing side cover (13) is fixed to one side of the antenna housing body (12). The support block (15) is fixed to the antenna housing body (12).

3. The broadband balun-fed UHF band omnidirectional antenna according to claim 1, characterized in that: The feed end faces of the lower arm radiator (5) and the upper arm radiator (6) are provided with welding grooves for assembling the feed coaxial line (10) and the short-circuit coaxial line (11).

4. A broadband balun-fed UHF band omnidirectional antenna according to claim 2, characterized in that: The lower arm radiator (5) and upper arm radiator (6) located between the support block (15) and the antenna housing side cover plate (13) are designed with thicker thickness.

5. A broadband balun-fed UHF band omnidirectional antenna according to claim 1, characterized in that: The parasitic radiator (4) is a square dipole sleeve structure.

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