WO2018149220A1 - Antenna cover and antenna - Google Patents

Abstract

Provided are an antenna cover and an antenna. The antenna cover comprises an antenna housing for encapsulating an antenna body, and a partition plate, at an inner side of the antenna housing, fixed to one another. The antenna cover provided in the present invention is additionally mounted with a partition plate at a position a certain distance from a main radiation plane at an inner side of the antenna housing, thereby weakening the electromagnetic wave energy inside the antenna cover, improving the overall radiation index of the antenna, and particularly improving the front-to-back and cross-polarization ratios of the antenna. Moreover, the present invention has a stronger universality for improving the radiation index of the antenna.

Description

Radome and antenna Technical field

The invention relates to the field of beautifying antennas, in particular to a double-layer structure radome and an antenna using the radome.

Background technique

Due to the fear of antenna radiation, modern residents have been clamoring for the resistance of mobile communication base stations. In order to hide the antenna, reduce complaints, and ensure coverage, the beautification of the antenna came into being. The current mainstream landscaping antenna covers are mainly divided into square columns, circular columns or sector columns, but the antennas in these various shaped hoods have deteriorated, especially the antenna front-to-back ratio and cross-polarization ratio. Specifically, the electromagnetic wave reflection in the outer cover is more complicated than the general cover, which causes the backward radiation of the antenna to become larger, that is, the front-to-back ratio becomes worse. At the same time, the electromagnetic energy of the antenna cover increases, and the cross-polarization ratio of the antenna also appears large. The magnitude is decreasing.

The current common optimization measures are to design the antenna separately for the housing used, such as developing a radiation unit for the corresponding housing, optimizing the shape of the reflector, or adding complicated boundaries around the antenna. However, such schemes have low development efficiency and high design cost. And the consistency is poor.

Summary of the invention

A primary object of the present invention is to provide a radome that increases the antenna radiation index.

Another object of the present invention is to provide an antenna using the above radome.

In order to achieve the above object, the present invention provides the following technical solutions:

A radome of the present invention includes an antenna cover for encapsulating an antenna body, and a partition plate disposed inside the antenna cover and fixed to each other.

Further, the partition is integrally formed with the antenna cover, or the partition is fixed to the antenna cover as a separate component.

Further, the spacer is disposed in parallel with the antenna cover, and the distance between the spacers is 0.2 to 0.3 times the wavelength corresponding to the center frequency of the antenna body.

Further, the antenna cover has a cylindrical shape, a fan-shaped column shape, a square column shape or other polygonal column shape.

Further, the thickness of the spacer is less than 0.1 times the wavelength corresponding to the center frequency of the antenna body.

Further, it is characterized in that the separator material is the same as the antenna cover, or both are made of materials having different dielectric constants.

Further, the material of the separator is FRP or polyvinyl chloride resin or other dielectric constant non-metal medium.

Compared with the prior art, the solution of the invention has the following advantages:

The radome provided by the invention is provided with a partition at a distance from the main radiating surface on the inner side of the antenna cover, thereby weakening the electromagnetic wave energy inside the antenna cover, improving the overall radiation index of the antenna, and particularly improving the antenna front-to-back ratio and the cross-polarization ratio; At the same time, it is more versatile in improving the antenna radiation index.

Another object of the present invention is to provide an antenna using the above radome, further comprising an antenna body having a reflector and a radiating unit mounted on the reflector, and a radome in which the antenna body is housed .

Further, the spacer is disposed in a space corresponding to the main radiation surface of the antenna cover.

Further, the main radiating surface of the antenna cover is a plane or a curved surface pointed by the front surface of the reflecting plate.

Compared with the prior art, the solution of the invention has the following advantages:

The antenna provided by the invention guarantees the concealing function at a relatively low cost, and the most important thing is to improve the radiation index of the beautifying antenna and solve the problem that the antenna index in the landscaping radome deteriorates.

The additional aspects and advantages of the invention will be set forth in part in the description which follows.

DRAWINGS

The above and/or additional aspects and advantages of the present invention will become apparent and readily understood from

1 is a perspective view of a first embodiment of an antenna provided by the present invention;

Figure 2 is a schematic cross-sectional view of the antenna of Figure 1;

3 is a schematic cross-sectional view showing a second embodiment of an antenna provided by the present invention;

4 is a schematic cross-sectional view showing a third embodiment of an antenna provided by the present invention;

5 is a schematic cross-sectional view showing a fourth embodiment of an antenna provided by the present invention;

6 is an antenna pattern of an antenna in the prior art;

Fig. 7 is a view showing the antenna pattern of the antenna of Fig. 6 after the radome of the present invention is used.

detailed description

The embodiments of the present invention are described in detail below, and the examples of the embodiments are illustrated in the drawings, wherein the same or similar reference numerals are used to refer to the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the drawings are intended to be illustrative of the invention and are not to be construed as limiting.

The present invention provides a two-layer structure radome that includes an antenna cover that is disposed and encapsulated in an antenna body, and a spacer that is disposed inside the antenna cover and that is fixed to each other. The radome attenuates electromagnetic wave energy between the antenna cover and the partition to improve the overall radiation index of the antenna.

Wherein, the partition plate is integrally formed with the antenna cover, or the partition plate is fixedly connected to the antenna cover as a separate component, and the fixed connection manner can be connected by using a screw connection or a snap connection. The baffle is disposed in parallel with the antenna cover, and the distance between the baffle and the inner side of the antenna cover is 0.2-0.3 times the wavelength corresponding to the frequency of the working center of the antenna where the radome is located.

The radome shape of the landscaping antenna currently used in the mainstream is mainly divided into a square column shape or a circular column shape or a fan-shaped column shape. Classified in the above three shapes, the following configurations of the radome are given:

In the first embodiment, as shown in FIG. 1-2, when the antenna cover is in a square column shape, the antenna 100 is a square column type beautifying antenna. The four faces of the antenna cover 101, that is, the A, B, C, and D faces, and the four faces are perpendicularly connected to each other. The distance between the partition 102 and the antenna cover 101 is 0.2 to 0.3 times the wavelength corresponding to the center frequency of the antenna body of the antenna 100. In this embodiment, the A side is the main radiating surface of the antenna cover of the antenna 100, and the partition 102 is disposed inside the A surface and the distance h1 from the antenna cover 101 is 0.2 of the wavelength corresponding to the working center frequency of the antenna 100. -0.3 times. The thickness d1 of the spacer 102 is less than 0.1 times the wavelength corresponding to the frequency of the working center of the antenna 100.

As shown in FIG. 3-4, when the antenna cover is cylindrical, the antenna is a cylindrical beautification antenna. In this case, the spacer is provided in two cases.

In the second embodiment, as shown in FIG. 3, the antenna cover is surrounded by the antenna cover 200. The partition plate 202 is disposed inside the antenna cover 201, and the partition plate 202 and the antenna cover 201 are concentric. The distance h2 between the partition 202 and the antenna cover 201 is 0.2-0.3 times the wavelength corresponding to the working center frequency of the antenna 200, and the thickness d2 of the spacer 202 is smaller than the corresponding wavelength of the working center frequency of the antenna 200. 0.1 times.

In the third embodiment, as shown in FIG. 4, the antenna cover is surrounded by the antenna cover 300. The distance between the partition 302 and the antenna cover 301 is 0.2 to 0.3 times the wavelength corresponding to the center frequency of the antenna body of the antenna 300. In fact, in the cylindrical beautification antenna, the arc surface of the antenna body directed to the front side thereof is larger than the electromagnetic wave energy of the arc surface pointed by the back surface. Therefore, the main radiating surface of the antenna 300 is the antenna cover pointed to the front surface of the antenna main body. The semi-circular surface area of 301. The distance h3 between the partition 302 and the main radiating surface of the antenna cover 301 is 0.2-0.3 times the wavelength corresponding to the operating center frequency of the antenna 300. The thickness d3 of the spacer 302 is less than 0.1 times the wavelength corresponding to the frequency of the working center of the antenna 300.

Embodiment 4 As shown in FIG. 5, when the shape of the radome is a fan-shaped column, the antenna 400 is a water tower type landscaping antenna, and its cross-sectional area perpendicular to the antenna cover 401 is a fan shape. The distance between the partition 402 and the inner side of the antenna cover 401 is 0.2 to 0.3 times the wavelength corresponding to the center frequency of the antenna body of the antenna 400. The front surface of the antenna body of the antenna 400 is directed to the arcuate area of the antenna cover 401. Therefore, the main radiating surface of the antenna cover is the arcuate area of the antenna cover 401, and the distance between the partition 402 and the main radiating surface of the antenna cover 401 is h4. The working center frequency of the antenna 400 corresponds to a wavelength of 0.2-0.3 times, and the thickness d4 of the spacer 402 is less than 0.1 times the wavelength corresponding to the operating center frequency of the antenna 400.

Preferably, when the distance h inside the main radiating surface of the radome from the main radiating surface is 0.25 times the wavelength corresponding to the working center frequency, the two opposite electromagnetic wave wavelengths of the radiation signal of the antenna between the partition and the outer cover are added together. At a wavelength of 0.5 times, the two reverse electromagnetic waves produce a phase difference of 180 degrees at the spacer, which is superimposed and reduced, which weakens the electromagnetic wave energy inside the radome, thereby improving the overall radiation index of the antenna, and particularly improving the antenna front-to-back ratio and Cross polarization ratio.

The transmission of electromagnetic waves between the antenna cover and the spacer includes the transmission of electromagnetic waves in the spacer. When the thickness of the spacer is sufficiently small, such as less than 0.1 times the wavelength, two reverse electromagnetic waves between the outer cover and the spacer are The effects of the offsetting effects of transmission are negligible.

In the optimized design of the above embodiment, the position of the spacer inside the antenna cover is determined by the main radiating surface, mainly because the radiant energy of the antenna main body on the back side and the radiant energy of the front side are small, which is not a main reference factor. Therefore, the main radiating surface of the antenna cover is the area pointed by the front side of the antenna main body. Therefore, the partition plate is disposed in the inner space of the main radiation surface, and the offset effect of the partition plate is more obvious.

In the first to fourth embodiments, the working center frequency of the antenna is the center point of the working frequency band corresponding to the antenna. The material of the separator may be the same as that of the antenna cover, or both may be made of materials having different dielectric constants. The separator material may be glass reinforced plastic or polyvinyl chloride resin, or other dielectric constant non-metallic medium.

The present invention also provides a radome of the above antenna, comprising an antenna cover and a partition disposed inside the antenna cover.

6 is an antenna pattern of a radome in which an antenna is not provided, and FIG. 7 is an antenna pattern in which the same antenna is a double-layer radome of the present invention. It can be seen from the comparison of the two figures that it is obvious that the antenna cover of the present invention significantly improves the antenna radiation index, especially the front-to-back ratio of the key indicators and the cross-polarization within 60 degrees are significantly improved.

The present invention provides an antenna using the above radome, as described in FIGS. 1-5, which further includes an antenna body disposed in the radome. The antenna body includes a reflector and a radiating unit mounted on the reflector.

Since the radiant energy of the antenna body on its back side is small compared to its front radiant energy, it is not a primary reference factor. Therefore, the main radiating surface of the antenna cover is the area pointed by the front side of the antenna main body. Therefore, the spacer is disposed on the inner side of the main radiation surface, and the offset effect of the spacer is more obvious. Therefore, the overall radiation index of the antenna is improved without changing the shape of the antenna cover, and the versatility of the modified design is more common. Strong.

At the same time, because different types of antennas have different shapes of antenna covers, the main radiating surface of the antenna cover is a plane or a curved surface pointed by the front side of the reflector. As shown in FIGS. 1 and 2, when the antenna 100 is a square-column type beautifying antenna, the antenna cover 101 has a square column shape, and the main radiating surface of the antenna cover 101 is the A surface to which the front surface of the reflecting plate 103 is directed. As shown in FIG. 4, when the antenna 300 is a cylindrical beautifying antenna, the antenna cover 301 has a cylindrical shape, and the main radiating surface of the antenna cover 301 is a semi-circular surface pointed by the front surface of the reflecting plate 303. As shown in FIG. 5, when the antenna 400 is a water tower type beautifying antenna, the antenna cover 401 has a fan-shaped column shape, and the main radiation surface of the antenna cover 401 is a curved surface pointed by the front surface of the reflection plate 403.

The antenna is provided with a partition at a distance from the main radiating surface on the inner side of the antenna cover, and electromagnetic waves are superimposed at the partition, thereby weakening the electromagnetic wave energy inside the radome, thereby improving the overall radiation index of the antenna, especially improving. The antenna front-to-back ratio and cross-polarization ratio.

The above is only a part of the embodiments of the present invention, and it should be noted that those skilled in the art can also make several improvements and retouchings without departing from the principles of the present invention. It should be considered as the scope of protection of the present invention.

Claims (10)

1. A radome includes an antenna cover for encapsulating an antenna body, and further comprising a spacer disposed inside the antenna cover and fixed to each other.
2. The radome according to claim 1, wherein the spacer is integrally formed with the antenna cover, or the spacer is fixed to the antenna cover as a separate component.
3. The radome according to claim 1, wherein the spacer is disposed in parallel with the antenna cover, and a distance between the two is 0.2 to 0.3 times a wavelength corresponding to a center frequency of the antenna body.
4. The radome according to claim 1, wherein the antenna cover has a cylindrical shape, a fan-shaped column shape, a square column shape or other polygonal column shape.
5. The radome according to claim 1, wherein the thickness of the spacer is less than 0.1 times a wavelength corresponding to a center frequency of the antenna body.
6. The radome according to claim 1, wherein the spacer material is the same as the antenna cover, or both are made of materials having different dielectric constants.
7. The radome according to claim 6, wherein the material of the spacer is FRP or polyvinyl chloride resin or other dielectric constant non-metal medium.
8. An antenna comprising an antenna body having a reflector and a radiating unit mounted on the reflector, and a radome having the antenna body covered therein, wherein the radome is according to claims 1 to 7. The radome of any of the above.
9. The antenna according to claim 8, wherein the spacer is disposed in a space corresponding to a main radiating surface of the antenna cover.
10. The antenna according to claim 9, wherein the main radiating surface of the antenna cover is a plane or a curved surface on which the front surface of the reflecting plate is directed.

Images