CN201408833Y - A kind of planar antenna and antenna module - Google Patents

Abstract

The utility model relates to the field of radio frequency antennas, and discloses an antenna module, which includes an antenna bracket, an antenna radiator, and a circuit board. The antenna radiator is arranged on the antenna bracket, and the antenna bracket is arranged on the circuit board in parallel. ; The antenna bracket includes a bracket body with a cavity, and a polar liquid sealed in the cavity. Compared with the prior art, the antenna module of the utility model changes the dielectric constant of the antenna support by injecting polar liquid into the cavity of the antenna support, and achieves the purpose of small antenna size under the premise of meeting the requirements of antenna frequency band bandwidth.

Description

A kind of planar antenna and antenna module

technical field

The utility model relates to the field of radio frequency antennas, in particular to a planar antenna and an antenna module.

Background technique

With the development of communication technology, the application of communication technology in scientific and technological products is also increasing day by day, making related communication products more and more diversified, and in recent years, consumers have higher and higher requirements for the functions of communication products, so many products with different designs and Functional communication products are constantly being proposed.

As far as communication portable products are concerned, taking a mobile phone as an example, the key design is the design of the mobile phone antenna, because the design quality of the mobile phone antenna will affect the quality of communication. Generally, mobile phone antennas are divided into two types: external and internal. The built-in mobile phone antenna is placed inside the mobile phone, such as a planar antenna (PIFA antenna). Because of its advantages of not being damaged, making the mobile phone look beautiful and having a relatively low electromagnetic wave absorption ratio (SAR value), the built-in mobile phone antenna gradually replaces the external one. Mobile phone antennas are widely used.

The current mobile phone is developing towards miniaturization and thinning, and the space inside the mobile phone is also reduced accordingly. However, the bandwidth of a PIFA antenna is closely related to the height of the antenna. Generally, the height of the dual-band antenna should be above 6mm, and the height of the quad-band antenna should be higher, at least above 8mm. Therefore, corresponding to the development trend of miniaturization and thinning of mobile phones, the development of PIFA antennas is limited.

Utility model content

The technical problem to be solved by the utility model is that the existing planar antenna cannot meet the defects of miniaturization and thinning of communication portable products, thereby providing a planar antenna with a small occupied space.

For solving the problems of the technologies described above, the technology of the present utility model is as follows:

A planar antenna includes an antenna bracket and an antenna radiator, the antenna radiator is arranged on the antenna bracket, wherein the antenna bracket includes a bracket body with a cavity, and a polar liquid sealed in the cavity .

Another object of the present utility model is to provide an antenna module, which includes an antenna bracket, an antenna radiator arranged on the antenna bracket, and a circuit board electrically connected to the antenna radiator, and the antenna bracket Set on the circuit board, the feature is that the antenna bracket includes a bracket body with a cavity, and a polar liquid sealed in the cavity.

Compared with the prior art, the antenna module of the present utility model includes an antenna support, an antenna radiator, and a circuit board, the antenna radiator is arranged on the antenna support, the antenna support is arranged on the circuit board, and the antenna support It includes a stent body with a cavity, and a polar liquid sealed in the cavity. By injecting a polar liquid into the cavity of the antenna support, the dielectric constant of the antenna support is changed, and the purpose of the small size of the antenna is achieved under the premise of meeting the requirements of the antenna frequency band bandwidth.

Description of drawings

Fig. 1 is a schematic structural diagram of a planar antenna provided by the present invention.

Fig. 2 is a schematic structural diagram of an antenna module provided by the present invention.

Fig. 3 is a schematic structural diagram of an antenna module of a comparative example of the present invention.

Fig. 4 is an antenna parameter performance diagram of an antenna module provided by the present invention.

Fig. 5 is an antenna parameter performance diagram of an antenna module in a comparative example of the present invention.

Detailed ways

In order to make the purpose, technical solution and advantages of the utility model clearer, the utility model will be further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described here are only used to explain the utility model, and are not intended to limit the utility model.

Referring to FIG. 1 , the first embodiment of the present invention provides a planar antenna, which includes an antenna bracket 10 and an antenna radiator 20 , and the antenna radiator 20 is arranged on the antenna bracket 10 . The antenna bracket 10 includes a bracket body 11 with a cavity, and a polar liquid sealed in the cavity.

The polar liquid may include one of water, methanol, ethanol, butanol, acetone, SAR solution, and a mixture thereof. In this embodiment, the antenna support 10 is a cuboid structure, and the antenna support 10 has a first plane and a second plane opposite to it. Certainly, the shape of the antenna support 10 is not limited to the above-mentioned rectangle, and the antenna support 10 may have other shapes, such as a cylindrical body with an elliptical cross-section, according to actual design requirements.

As shown in FIG. 2 , the antenna bracket 10 of this embodiment further includes a hole 12 for injecting polar liquid into the cavity. The position of the hole 12 can be at any position of the bracket, preferably the hole 12 is located at a corner of the first plane of the antenna bracket 10, which is beneficial to inject polar liquid into the cavity.

The antenna bracket 10 also includes a cover adapted to the hole, the cover is used to seal the cavity, and the cover is made of plastic material. Of course, the antenna bracket 10 may not be provided with the above-mentioned cover structure, but directly seal the above-mentioned hole 12 for injecting polar liquid through a sealing material, such as hot melt adhesive.

The thickness of the antenna support 10 is at least 5 mm. In this embodiment, the thickness of the antenna support 10 is preferably 5 mm, that is, the distance between the first plane and the second plane of the antenna support 10 is 5 mm.

The antenna radiator 20 includes an antenna main body 21 and a feeding point 22 and a grounding point 23 on the antenna main body 21 , and the antenna main body 21 includes a high frequency radiation part 211 and a low frequency radiation part 212 connected to each other. The high frequency radiation part 211 defines a groove 213 for adjusting the resonant frequency of the high frequency radiation part 211 . The feed point 22 and the ground point 23 are arranged on the first side 13 of the antenna support 10 in parallel; A certain distance is set on the first side 13 of the antenna bracket 10 parallel to the feeding point 22, the distance is 4-8 mm, preferably 5 mm in this embodiment.

Based on the first embodiment, the second embodiment of the present invention provides an antenna module. The antenna module includes an antenna bracket 10, an antenna radiator 20 arranged on the antenna bracket 10, and a circuit board 30 electrically connected to the antenna radiator 20, the antenna bracket 10 is arranged on the circuit board 30, the The antenna bracket 10 includes a bracket body with a cavity, and a polar liquid sealed in the cavity.

Both the antenna radiator 20 and the antenna bracket 10 mentioned above adopt the structures in the first embodiment, which will not be repeated here.

The circuit board 30 is provided with a feeding point 31 and a grounding point 32; the feeding point 31 and the grounding point 32 on the circuit board 30 are respectively electrically connected to the feeding point 22 and the grounding point 23 of the radiator.

FIG. 4 is a performance diagram of antenna parameters of the antenna module measured after injecting a polar liquid with a dielectric constant ε=54.74 into the cavity of the antenna bracket of the present embodiment.

As shown in FIG. 4 , the return loss values of the antenna module in this embodiment at three frequency points of 824Mz, 960MHz and 1.99GHz are -6.0dB, -4.9dB and -4.3dB respectively.

Please also refer to FIG. 5 . FIG. 5 is a performance diagram of antenna parameters of a pair of ratios of the antenna module of the present embodiment. As shown in FIG. 3 , the antenna module of the comparative example includes an antenna support 100 , an antenna radiator 200 disposed on the antenna support 100 , and a circuit board 300 , and the antenna support is disposed on the entire surface of the antenna support. Compared with the present embodiment, the antenna bracket of the comparative example is not injected with polar liquid, and the area of the antenna radiator is larger than that of the antenna radiator of the present embodiment. As shown in Figure 5, the return loss values of the antenna module of the comparative example at the three frequency points of 824MHz, 960MHz and 1.99GHz are -2dB, -1.9dB and -3.4dB respectively. Compared with the antenna module of the second embodiment of the utility model, the return loss values at the three frequency points of 824Mz, 960MHz, and 1.99GHz are respectively -6.0dB, -4.9dB and -4.3dB, it is easy to see that the utility model Compared with the antenna module of the comparative example, the area of the antenna radiator of the antenna module of the embodiment is much smaller, but it has good electrical performance; so the antenna bracket and the antenna radiator can be reduced to meet the requirements of the antenna. The electrical performance requirements are met, and the purpose of reducing the size of the antenna is also achieved.

Compared with the prior art, the antenna module of the present invention includes an antenna bracket, an antenna radiator, and a circuit board, the antenna radiator is arranged on the antenna bracket, and the antenna bracket is arranged on the circuit board in parallel, wherein , The antenna bracket includes a bracket body with a cavity, and a polar liquid sealed in the cavity. From the above description, it can be clearly seen that by injecting a polar liquid into the cavity of the antenna support to change the dielectric constant of the antenna support, the purpose of a small antenna size is achieved under the premise of meeting the requirements of the antenna frequency band bandwidth.

The above descriptions are only preferred embodiments of the present utility model, and are not intended to limit the protection scope of the present utility model. Any modifications, equivalent replacements and improvements made within the spirit and principles of the present utility model shall be included in the protection scope of the present utility model.

Claims (8)

1, a kind of flat plane antenna comprises antenna holder and antenna radiator, and described antenna radiator is laid on the described antenna holder, it is characterized in that, antenna holder comprises that one has the rack body of cavity, and is enclosed within the polar liquid in the described cavity.

2, flat plane antenna according to claim 1 is characterized in that, described antenna holder also comprises the hole, and described hole is used to inject polar liquid in cavity; And lid, described lid is used for airtight described cavity.

3, flat plane antenna according to claim 1 is characterized in that, described antenna radiator comprises antenna body, and is positioned at distributing point and earth point on the antenna body; Described antenna body comprises high-frequency radiation part and the low frequency radiation portion that is connected with each other.

4, flat plane antenna according to claim 3 is characterized in that, described high-frequency radiation part offers a groove, and described groove is used to adjust the resonance frequency of high-frequency radiation part.

5, flat plane antenna according to claim 3 is characterized in that, described distributing point is arranged at first side of described antenna holder, and described earth point is parallel to first side that described distributing point is arranged at described antenna holder.

6, a kind of antenna modules, comprise antenna holder, be laid in the antenna radiator on the described antenna holder, and the circuit board that is electrically connected with antenna radiator, described antenna holder is located on the circuit board, it is characterized in that described antenna holder comprises that one has the rack body of cavity, and be enclosed within the polar liquid in the described cavity.

7, antenna modules according to claim 6 is characterized in that, described antenna radiator comprises antenna body, and is positioned at distributing point and earth point on the antenna body; Described antenna body comprises high-frequency radiation part and the low frequency radiation portion that is connected with each other.

8, antenna modules according to claim 7 is characterized in that, described circuit board is provided with distributing point and earth point; Distributing point on the described circuit board and earth point are electrically connected with distributing point and earth point on the antenna body respectively.

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