CN211980887U

CN211980887U - Ultra-wideband omnidirectional antenna binary array

Info

Publication number: CN211980887U
Application number: CN202020713965.6U
Authority: CN
Inventors: 武哲; 云宇; 云彩明; 苗玉湘; 高润
Original assignee: Xian International University
Current assignee: Xian International University
Priority date: 2020-04-29
Filing date: 2020-04-29
Publication date: 2020-11-20
Anticipated expiration: 2030-04-29

Abstract

The utility model discloses an ultra wide band omnidirectional antenna binary array, including a pair of upper and lower parallel arrangement's metal flat board, air packing between a pair of metal flat board, the metal flat board's that is located upper portion last surface vertical is connected with a pair of radiation array sub-arm, and the metal flat board's that is located the lower part lower surface also is connected with a pair of radiation array sub-arm perpendicularly, and the metal flat board's that is located the lower part lower surface central point puts the department and still is provided with coaxial SMA and presents the electric head. The utility model provides a traditional omnidirectional antenna impedance bandwidth that exists is limited among the prior art, and hardly each frequency point realizes good horizontal omnidirectional radiation's problem in the in-band.

Description

Ultra-wideband omnidirectional antenna binary array

Technical Field

The utility model belongs to the technical field of mobile communication, microwave qxcomm technology covers, concretely relates to ultra wide band qxcomm technology antenna binary array.

Background

As the role of the antenna in the whole communication link is of great importance, with the rapid development of wireless communication systems, various antennas have been proposed to meet higher requirements. With current antenna usage, omni-directional antennas can achieve 360 ° coverage in the horizontal azimuth plane. Examples of omni-directional antennas in communication environments, whether civilian or military, are numerous, such as radio frequency identification, broadcast television, aircraft, and the like. Meanwhile, due to the complexity and the variability of the communication environment and the improvement of the communication requirement, a wider frequency band is also required for the omnidirectional antenna. Not only is good matching achieved within the bandwidth range, but stability of horizontal omnidirectional radiation is more desirable. Although the conventional omnidirectional antenna is well developed, the impedance bandwidth of the conventional omnidirectional antenna is limited, and it is difficult to achieve good horizontal omnidirectional radiation at each frequency point in a band.

The ultra-wideband omnidirectional binary array of pure metal is researched, and has the advantages of ultra-wideband, high efficiency, stable in-band horizontal omnidirectional radiation, easiness in manufacturing and cost saving. It can be used in several ways: 1. radio frequency identification and wireless Wifi coverage; 2. an omnidirectional radar; 3. bluetooth, unmanned aerial vehicle etc.

SUMMERY OF THE UTILITY MODEL

The utility model aims at providing an ultra wide band omnidirectional antenna binary array has solved the traditional omnidirectional antenna impedance bandwidth that exists among the prior art and is limited, and hardly realizes good horizontal omnidirectional radiation's problem at each frequency point in-band.

The utility model provides a technical scheme be, an ultra wide band omnidirectional antenna binary array, including a pair of upper and lower parallel arrangement's metal flat board, air packing between a pair of metal flat board, the metal flat board's that is located upper portion last surface vertical is connected with a pair of radiation array sub-arm, the metal flat board's that is located the lower part lower surface also is connected with a pair of radiation array sub-arm perpendicularly, the metal flat board's that is located the lower part lower surface central point department of putting still is provided with coaxial SMA and feeds forward the electric head, metal flat board's length is 50mm, 1/5-1/2 between the wavelength promptly, it is 1/12-1/8 operating wavelength promptly for wide 24mm, it is a pair of radiation array sub-arm all corresponds and sets up in place metal flat board's border position department, and.

The utility model is also characterized in that,

the distance between a pair of the metal flat plates is 0.01-0.08 times of the wavelength.

And the pair of metal flat plates are fixedly connected through a support body.

The beneficial effects of the utility model are that, horizontal omnidirectional cover and directionality are stronger, realize good omnidirectional effect in the ultra wide band frequency band. Omnidirectional antennas have good out-of-roundness at low frequencies compared to high frequencies, and furthermore, the maximum radiation gain of the antenna increases as the frequency increases. The antenna obtains the maximum effective radiation gain at 1.7 GHz. The omnidirectional antenna realizes S11< -10dB in the frequency band range of 0.8-1.7GHz, and the impedance bandwidth of an ultra-wideband is obtained. Meanwhile, the omnidirectional antenna can form effective radiation gain in an ultra-wideband range, and the out-of-roundness of the horizontal omnidirectional antenna is within 3.6 dB. The antenna has stable performance in the horizontal direction and meets the requirements of the ultra-wideband omnidirectional antenna.

Drawings

Figure 1 is a block diagram of a pure metal ultra-wideband omni-directional antenna;

FIG. 2 is a diagram of the structure of a pure metal short-circuit magnetic dipole;

fig. 3 is an electric dipole antenna based on a short circuit structure of the utility model;

FIG. 4(a) is the far field radiation pattern of the 0.8GHz section of the pure metal ultra-wideband omnidirectional antenna;

FIG. 4(b) is the far field radiation pattern of the 1.2GHz section of the pure metal ultra-wideband omnidirectional antenna;

FIG. 4(c) is the far field radiation pattern of the 1.7GHz section of the pure metal ultra-wideband omni-directional antenna;

figure 5 is a graph of the gain of the pure metal ultra-wideband omni-directional antenna as a function of frequency;

fig. 6 is a return loss curve diagram of the pure metal ultra-wideband omni-directional antenna.

In the figure, 1 is a radiation array sub-arm, 2 is a metal flat plate, 3 is a coaxial SMA feed head, and 4 is a support body.

Detailed Description

The present invention will be described in detail with reference to the accompanying drawings and specific embodiments.

The utility model relates to an ultra wide band omnidirectional antenna binary array, the structure is shown in figure 1, including a pair of metal flat board 2 of upper and lower parallel arrangement, air packing between a pair of metal flat board 2, the metal flat board 2's that is located the upper portion upper surface vertical is connected with a pair of radiation array sub-arm 1, and the metal flat board 2's that is located the lower part lower surface also is connected with a pair of radiation array sub-arm 1 perpendicularly, and the metal flat board 2's that is located the lower part lower surface central point puts the department and still is provided with coaxial SMA feed head.

The distance between a pair of the metal flat plates 2 is 0.01-0.08 times of the wavelength.

The length of the metal flat plate 2 is 50mm, namely between 1/5 and 1/2 wavelengths, and the width of the metal flat plate 2 is 24mm, namely 1/12 to 1/8 working wavelengths.

The pair of radiation array sub-arms 1 are correspondingly arranged at the edge position of the metal flat plate 2, and the pair of radiation array sub-arms 1 are arranged in parallel.

The pair of metal flat plates 2 are connected and fixed by a support 4.

The utility model discloses a prototype is quarter short circuit magnetic dipole as shown in fig. 2, and this magnetic dipole antenna adopts identical foil about with the air packing medium as upper surface and ground plate respectively, and wherein one end carries out ground connection through short circuit electric wall, and the other end is opened a way simultaneously. The plurality of parallel arrows of the opening portion as shown in fig. 2 represent the electric field vector E distribution. Obtaining equivalent magnetic current according to the boundary condition of electromagnetic field

As shown by the dotted arrow M in fig. 2, the equivalent magnetic currents on the two sides of the antenna structure have equal amplitude and opposite directions, so that the far-field radiation energy cancels each other, and the equivalent magnetic currents in the front part form a magnetic dipole to form effective radiation.

On the basis of the short-circuit magnetic dipole, two radiation arms are connected to an open end, and the radiation arms are opened by 90 degrees in opposite directions as shown in figure 3. At the moment, the surface conduction current of the upper part and the lower part of the original short circuit structure is welded to the array arms through metal to form a typical electric basic array antenna, and the original open equivalent magnetic current radiation is changed into the radiation effect of an electric dipole. The structure can be equivalent to a quasi-parallel strip line, quasi-TEM mode distribution is excited between an upper metal plate and a lower metal plate of a quarter short-circuit structure, signals are transmitted between the plates to an opening and are connected to a pair of array radiation arms in opposite directions, and the signals are converted from a previous transmission balanced state into an unbalanced state with a radiation mode.

By using the radiation principle of short-circuit magnetic dipoles for reference, the magnetic dipoles of a single-point coaxial feed air medium excite the vertically polarized electric dipole arms to form horizontal omnidirectional radiation. As shown in fig. 1, the ground plane and the upper surface of the antenna are identical and are formed by a rectangular metal sheet. The two ends of the metal plate are vertically connected with radiating electric dipole arms, the coaxial feeder feeds radio-frequency signals at the center of the antenna structure through the SMA joint, the probe contacts the upper surface, and the coaxial outer conductor contacts the lower grounding plate. The antenna carries out horizontal omnidirectional radiation through the opened vertical dipole arm, has the advantages of ultra wide band, high radiation efficiency, stable in-band performance, easy processing and production and the like, and meets the requirements of omnidirectional radiation communication in a wide band range.

The utility model discloses short circuit magnetic dipole's radiation mechanism based on equivalence principle analysis removes short circuit electric wall, simultaneously at the open end of two opposite directions of antenna center single-point feed excitation. Two radiation arms are connected to the edge of the open circuit, and the directions are opposite, so that a half-wave symmetric array is formed to carry out horizontal omnidirectional radiation. The proposed technical utility model can be understood as a one-to-two single-point coaxial feed forming two parallel double transmission line structures filled with air media with opposite propagation directions, and the open circuit end is opened by 90 ° to form a radiating array. The omnidirectional radiation is realized in the horizontal azimuth plane, and the performance is stable in the broadband range. The introduction of the binary array enhances the radiation gain of the omnidirectional antenna, and the air medium filling can be replaced by a corresponding foam structure in the later manufacturing process.

The section patterns of the E plane and the H plane of the designed antenna at 0.8GHz,1.2GHz and 1.7GHz are respectively shown in FIGS. 4(a) to 4 (c). As can be seen from fig. 4(a) -4 (c), the designed antenna has good omnidirectional radiation in the operating frequency band, and in the high frequency region, due to the corresponding increase of the electrical size of the antenna, other resonant modes are introduced, so that the out-of-roundness of the corresponding H-plane of the antenna gradually increases with the increase of the operating frequency. In comparison with the gain curve shown in fig. 5, the radiation gain of the antenna is gradually increased in the frequency band of 0.8-1.7 GHz. This is because the effective receiving area of the antenna corresponding to the high frequency region increases in the operating frequency band, and the gain increases. The return loss curve of the antenna is shown in figure 6, and as can be seen from figure 6, the ultra-wideband working performance is realized within the frequency band range S11< -10dB of 0.8-1.7 GHz. The broadband characteristic is formed by two resonance points (at 0.9 and 1.5GHz, respectively) created by the dipole arms and the parallel split metal plates, respectively. Comparing fig. 5 and fig. 6, it can be seen that the present invention satisfies the requirements of return loss and effective radiation gain in the operating frequency band.

Claims

1. An ultra-wideband omnidirectional antenna binary array is characterized by comprising a pair of metal flat plates (2) which are arranged in parallel up and down, wherein air is filled between the pair of metal flat plates (2), the upper surface of the metal flat plate (2) positioned at the upper part is vertically connected with a pair of radiation array sub-arms (1), the lower surface of the metal flat plate (2) positioned at the lower part is also vertically connected with a pair of radiation array sub-arms (1), the central position of the lower surface of the metal flat plate (2) positioned at the lower part is also provided with a coaxial SMA feed head (3), the length of the metal flat plate (2) is 50mm, the wavelength is 1/5-1/2, the width is 24mm, namely 1/12-1/8 working wavelength, the pair of radiation array sub-arms (1) are correspondingly arranged at the edge position of the metal flat plate (2), and the pair of radiation array sub-arms (1) are arranged in parallel.

2. The binary array of ultra-wideband omni-directional antennas according to claim 1, wherein the distance between a pair of the metal plates (2) is 0.01-0.08 times the wavelength.

3. The binary array of ultra wide band omnidirectional antenna according to claim 1, characterized in that a pair of the metal plates (2) are fixedly connected through a support body (4).