CN204130705U - A Broadband Grid Antenna Array - Google Patents

Abstract

The utility model discloses a broadband grid antenna array, which comprises a reflection floor and a plurality of radiation units vertically arranged on the reflection floor, wherein the upper layer of the reflection floor is provided with a plurality of microstrip transmission lines connected with the radiation units, and the radiation units surround the reflection floor to form the grid antenna array; the front and back surfaces of each radiation unit are covered with radiation patches, the lower parts of the front and back surfaces of each radiation unit are etched to form a section of radiation patch exposed medium part, the left and right ends of the exposed medium part are respectively adhered with metal sheets, and the metal sheets are respectively connected with the radiation patches and the microstrip transmission line; a plurality of through holes are formed in the periphery of each radiating unit and penetrate through the radiating patches on the front face and the back face of each radiating unit. The utility model discloses an antenna array feed network is simple, has frequency bandwidth, easy, characteristics such as with low costs of processing, can satisfy broadband communication system's requirement.

Description

A Broadband Grid Antenna Array

technical field

The utility model relates to an antenna array, in particular to a broadband grid antenna array, which belongs to the field of wireless communication.

Background technique

Antenna is a device used to transmit and receive electromagnetic waves in wireless devices. Anything that uses electromagnetic waves to transmit information relies on antennas to work. With the continuous development of communication technology, the amount of information transmitted in wireless communication is increasing, and the requirements for antennas are also getting higher and higher. Antennas are developing in the direction of broadband, intelligence, low profile, and low cost. Most of the currently used antenna arrays need to add a feed network to ensure the performance of the antenna, but this will not only increase the return loss of the antenna but also increase the cost of the antenna, making the structure of the antenna complicated; while the grid antenna It is a high-gain antenna used in the millimeter wave field. It uses a half-wavelength transmission line to connect each radiation unit, so that the entire antenna array has only one input port, and the feeder and antenna are connected as a whole, but the bandwidth of this antenna is not enough. , unable to meet the bandwidth requirements of the LTE frequency band.

According to investigation and understanding, the existing technologies that have been disclosed are as follows:

1) In 2010, Xing Chen et al. published an article titled "A Novel Wideband and Compact Microstrip Grid Array Antenna" on IEEE TRANSACTIONS ON ANTENNAS ANDPROPAGATION. The author proposed a wideband compact microstrip grid antenna, wave The shape of the transmission line makes the structure compact, and the elliptical radiation patch can increase the radiation bandwidth of the antenna, and the fractional bandwidth is 25%.

2) In 2011, YueHui Cui et al. published an article titled "Novel Dual-Broadband Planar Antenna and Its Array for 2G/3G/LTE Base Stations" on IEEE TRANSACTIONS ON ANTENNAS ANDPROPAGATION, and proposed an antenna array for base stations , the antenna has two radiation bands of low frequency and high frequency, which can meet the frequency band requirements of 2G/3G/LTE, but this antenna array requires a complex feeding network, which increases the processing cost of the antenna.

Utility model content

The purpose of this utility model is to solve the defects of the above-mentioned prior art, and to provide a broadband grid antenna array. system requirements.

The purpose of this utility model can be achieved by taking the following technical solutions:

A broadband grid antenna array, including a reflective floor and a plurality of radiating units erected on the reflective floor, the upper layer of the reflective floor is provided with a plurality of microstrip transmission lines connecting each radiating unit, and the plurality of radiating units are placed on the A grid antenna array is formed on the reflective floor; the front and back sides of each radiating unit are covered with radiation patches, and a section of the radiation patch is corroded to expose the medium part on the front and back sides of each radiating unit. The left and right ends of the dielectric part are respectively pasted with metal sheets, and the metal sheets are respectively connected with the radiation patch and the microstrip transmission line; there are multiple via holes around each radiation unit, and the multiple via holes Holes run through the radiating patches on both sides of the radiating unit.

As an implementation, the antenna array also includes a coaxial line, the lower layer of the reflective floor is a metal floor, the outer conductor of the coaxial line is connected to the metal floor, and the inner conductor passes through the medium of the reflective floor and connects with it. Metal sheet connection of a radiating element.

As an implementation, the plurality of radiating units include radiating units arranged vertically and radiating units arranged horizontally.

As an implementation, the radiating units arranged vertically have one or more columns, the radiating units arranged horizontally have one or more rows, and the number of columns of radiating units arranged vertically is the same as the number of rows of radiating units arranged horizontally same.

As an implementation, the length of each microstrip transmission line is half of the wavelength corresponding to the central frequency of the grid antenna array.

As an implementation, the multiple via holes of each radiating unit are evenly distributed around the radiating unit.

As an implementation, the reflective floor and the plurality of radiation units are both rectangular in shape.

Compared with the prior art, the utility model has the following beneficial effects:

1. In the antenna array of the present invention, a plurality of radiating units are erected on a reflective floor, so that the plurality of radiating units form a grid antenna array, which prevents the electromagnetic field energy from being stored between the radiating unit and the reflective floor, and increases the antenna’s Radiation bandwidth solves the problem of insufficient bandwidth of traditional grid antennas.

2. The antenna array of the present utility model feeds energy into a radiation unit through a coaxial line, and then feeds into other radiation units through a microstrip transmission line. The entire feeding network is simple, which overcomes the complex problem of the traditional antenna feeding network, and can The production cost of the antenna is saved.

3. Compared with commonly used antenna arrays, the antenna array of the present invention has a simpler feeding network, and the entire antenna array is set on a reflective floor, which is easy to process and low in cost, and can be applied to 1.71GHz-2.69GHz LTE The frequency band can meet the requirements of broadband communication systems.

Description of drawings

FIG. 1 is a perspective view of a broadband grid antenna array according to Embodiment 1 of the present invention.

Fig. 2 is a front view of the wideband grid antenna array in Embodiment 1 of the present invention.

Fig. 3 is a left view of the wideband grid antenna array in Embodiment 1 of the present invention.

Fig. 4 is a top view of the wideband grid antenna array according to Embodiment 1 of the present invention.

FIG. 5 is a diagram of the S-parameter simulation results of the wideband grid antenna array according to Embodiment 1 of the present invention.

Fig. 6a is an H-plane radiation pattern at 2 GHz of the broadband grid antenna array in Embodiment 1 of the present invention.

Fig. 6b is an H-plane radiation pattern at 2.2 GHz of the broadband grid antenna array in Embodiment 1 of the present invention.

Fig. 6c is the H-plane radiation pattern at 2.4 GHz of the broadband grid antenna array in Embodiment 1 of the present utility model

Fig. 7 is a perspective view of the wideband grid antenna array according to Embodiment 2 of the present invention.

Fig. 8 is a perspective view of the wideband grid antenna array according to Embodiment 3 of the present invention.

Among them, 1-reflecting floor, 2-coaxial line, 3-radiating unit, 4-microstrip transmission line, 5-radiating patch, 6-dielectric part, 7-metal sheet, 8-via.

Detailed ways

Example 1:

As shown in Figures 1 to 4, the broadband grid antenna array of this embodiment includes a reflective floor 1, a coaxial line 2, and four radiating units 3 erected on the reflective floor 1, the reflective floor 1 and the four radiating units 3 all adopt PCB boards (dielectric constant of the medium is 2.55), and the shapes are all rectangular; the upper layer of the reflective floor 1 is provided with four microstrip transmission lines 4 connecting each radiation unit 3, and the lower layer is a metal floor; the four radiation In unit 3, there are two radiating units 3 arranged vertically, and two radiating units 3 arranged horizontally (that is to say, the radiating units 3 arranged vertically have a column, and the radiating units 3 arranged horizontally have a row), which are jointly formed on the reflective floor 1. Grid antenna array; the length of each microstrip transmission line 4 is half of the wavelength corresponding to the central frequency of the grid antenna array.

The front and back sides of each radiating unit 3 are covered with radiation patches 5, and a section of radiation patch 5 is etched off on the lower part of the front and back sides of each radiating unit 3 to expose the dielectric part 6. This design is mainly used to adjust the antenna The distance between the reflective floor; the left and right ends of the exposed medium part 6 are respectively pasted with metal sheets 7 (the front and back sides, there are four pieces, hereinafter referred to as the left metal sheet 7 as the left metal sheet 7, and the right end of the metal sheet 7). The metal sheet 7 is the right metal sheet 7), the right metal sheet 7 of the radiation unit 3 on the left side of the grid antenna array is connected with the radiation patch 5 and the microstrip transmission line 4 respectively; the left metal sheet of the radiation unit 3 on the right side of the grid antenna array 7 are respectively connected to the radiation patch 5 and the microstrip transmission line 4, and the left metal sheet 7 and the right metal sheet 7 of the radiation unit 3 in front of and behind the grid antenna array are respectively connected to the radiation patch 5 and the microstrip transmission line 4; A plurality of uniformly distributed via holes 8 are opened around each radiation unit 3, and the plurality of via holes 8 run through the radiation patches 5 on the front and back sides of the radiation unit 3, so that the radiation patches 5 on the front and back sides are connected to the Together; the outer conductor of the coaxial line 2 is connected to the metal floor, and the inner conductor is connected to the right metal sheet 7 of the radiation unit 3 on the left side of the grid antenna array after passing through the medium of the reflective floor 1 .

The working principle of the broadband grid antenna array in this embodiment is: the coaxial line 2 first feeds energy into the radiation unit 3 on the left side of the grid antenna array, and then feeds energy into other radiation units 3 through the microstrip transmission line 4 , since the length of the microstrip transmission line 4 is half of the wavelength corresponding to the center frequency of the grid antenna array, the current direction of each radiation unit 3 is the same near the center frequency, which is different from the traditional grid antenna In this embodiment, the radiation unit 3 is erected, so as to avoid the electromagnetic field energy from being stored between the radiation unit 3 and the reflective floor 1, thereby increasing the radiation bandwidth of the antenna; the current can have many paths on the radiation unit 3, and different current paths can be Radiation is generated at different frequency points.

Through calculation and electromagnetic field simulation, the broadband grid antenna array of this embodiment has been verified and simulated, as shown in Figure 5, which provides the curve of the S parameter simulation results of the antenna in the frequency range of 1.4 to 2.7Ghz, S1, 1 The curve refers to the input return loss (reflection coefficient). It can be seen that in the LTE frequency band of 1.71GHz to 2.41GHz, the value of the S1,1 curve is less than -10dB, which can meet the requirements of broadband high-speed wireless communication systems. The H surface radiation pattern of the broadband grid antenna array of this embodiment is shown in Figures 6a to 6c (wherein Figure 6a is the H surface radiation pattern at 2GHz, and Figure 6b is the H surface radiation pattern at 2.2GHz , Figure 6c is the radiation pattern of the H surface at 2.4GHz), it can be seen that the radiation pattern of the H surface remains stable in a wide frequency band, and the maximum radiation points are all towards the Z axis (perpendicular to the axial direction of the reflective floor 1 )Positive direction.

Example 2:

As shown in Figure 7, on the basis of the structure of Embodiment 1, a grid antenna array of ten radiating units 3 is formed on the reflective floor 1. It can be seen that the radiating units 3 arranged vertically have three columns, and the radiating units 3 arranged horizontally The Radiant Unit 3 has three rows.

Example 3:

As shown in Figure 8, on the basis of the structure of Embodiment 1, horizontal and vertical expansion are carried out simultaneously, and a grid antenna array of sixteen radiating units 3 is formed on the reflective floor 1. It can be seen that the radiating units 3 arranged vertically have There are five columns, and the radiating elements 3 arranged horizontally have five rows.

In the above-mentioned embodiment, the PCB board adopted by the reflector and each radiation unit can be made of any dielectric material of FR4, polyimide, polytetrafluoroethylene glass cloth and co-fired ceramics; the metal floor, radiation The metal used for the patches and metal sheets is any one of aluminum, iron, tin, copper, silver, gold and platinum, or any alloy of aluminum, iron, tin, copper, silver, gold and platinum.

The above is only a preferred embodiment of the utility model patent, but the scope of protection of the utility model patent is not limited thereto, any skilled person familiar with the technical field within the disclosed scope of the utility model patent, according to The technical scheme of the utility model patent and the equivalent replacement or change of the utility model concept all belong to the protection scope of the utility model patent.

Claims (7)

1. a broadband grid antenna array, it is characterized in that: comprise reflection floor and setting be arranged on reflection floor on multiple radiating elements, the upper strata on described reflection floor is provided with many microstrip transmission lines connecting each radiating element, and described multiple radiating element surrounds grid antenna array on reflection floor; The tow sides of described each radiating element are all coated with radiation patch, and the tow sides bottom of each radiating element all erodes one section of radiation patch exposes media fraction, the left and right two ends metal clad sheet respectively of this media fraction exposed, described sheet metal is connected with radiation patch and microstrip transmission line respectively; The surrounding of described each radiating element has multiple via hole, the double-edged radiation patch of described multiple via hole penetrating radiation unit.

2. a kind of broadband according to claim 1 grid antenna array, it is characterized in that: described aerial array also comprises coaxial line, the lower floor on described reflection floor is metal floor, the outer conductor of described coaxial line is connected with metal floor, is connected after the medium of inner wire through reflection floor with the sheet metal of one of them radiating element.

3. a kind of broadband according to claim 1 grid antenna array, is characterized in that: described multiple radiating element comprises the radiating element of longitudinal arrangement and transversely arranged radiating element.

4. a kind of broadband according to claim 3 grid antenna array, it is characterized in that: the radiating element of described longitudinal arrangement has row or multiple row, described transversely arranged radiating element has a line or multirow, and the columns of the radiating element of longitudinal arrangement is identical with the line number of transversely arranged radiating element.

5. a kind of broadband according to claim 1 grid antenna array, is characterized in that: the length of described every bar microstrip transmission line corresponding to grid antenna array center frequency wavelength 1/2nd.

6. a kind of broadband according to claim 1 grid antenna array, is characterized in that: multiple via holes of described each radiating element are evenly distributed on the surrounding of radiating element.

7. a kind of broadband grid antenna array according to any one of claim 1-6, is characterized in that: the shape of described reflection floor and multiple radiating element is rectangle.