CN107819203A - A Magnetoelectric Dipole Antenna Based on a Metasurface Dielectric Plate - Google Patents

Abstract

The invention provides a magnetoelectric dipole antenna of a super-surface dielectric plate, which comprises a first dielectric layer, a second dielectric layer and a third dielectric layer, wherein a pair of short-circuit columns and a vertical transmission line penetrate through the three dielectric layers, and a feed structure is arranged in the middle of each dielectric layer; a vertical transmission line and a feed structure are used to feed the magneto-electric dipole antenna. The invention widens the frequency band by designing the slot with a proper shape on the electric dipole, the impedance bandwidth of the antenna has the range of low frequency from 3.12GHz to 5.92GHz and high frequency from 7.14GHz to 8.45 GHz. The gain ripple is from 6.0dBi to 8.9dBi at low frequencies and from 6.7dBi to 9.6dBi at high frequencies. Nearly symmetrical directional radiation patterns in both the E-plane and H-plane radiating planes can be achieved over the entire operating frequency band of the antenna. The invention combines the traditional magnetoelectric dipole antenna technology and the super-surface technology, and realizes the functions of wide frequency band, high gain, directional radiation and the like of the antenna.

Description

A Magnetoelectric Dipole Antenna Based on a Metasurface Dielectric Plate

[technical field]

The invention belongs to the technical field of communication, and in particular relates to a magnetoelectric dipole antenna of a metasurface dielectric plate.

[Background technique]

In the process of continuous development of antenna information transmission technology, different frequency bands are successively divided for use, and each re-division represents a leap forward in communication technology. From the development of the first generation (1G) to the fourth generation (4G) mobile communication system, we can find that the communication field is gradually moving towards broadband and high frequency. constantly improving. With the continuous improvement of communication frequency and the continuous development of antenna technology, the speed of Internet access is also gradually accelerating. Now mobile phones can realize most of the functions that can only be operated on computers before, such as video chat, mobile games, online transfer, etc. Wait. The pursuit of higher-speed communication not only brings huge development prospects to the development of the Internet industry, but also brings greater challenges to antenna technology.

The originally proposed magnetoelectric dipole antenna has undergone a lot of research and has made many progresses. The current magnetoelectric dipole antenna has many superior characteristics, such as high gain, complementary orientation of E plane and H plane Radiation and more. Moreover, due to its excellent properties in the fields of physics and electronic engineering, metamaterials have attracted the attention of many researchers. It has the characteristics of improving the transmission of electromagnetic radiation, increasing the relative permittivity, etc., and can be used to reduce the size of the antenna, realize frequency reconfigurability, increase antenna gain, and so on.

For the magnetoelectric dipole antenna, many developments and improvements have been made in the follow-up work since the first microstrip antenna combined with this relatively stable new dipole. A wide-band, dual-band magnetoelectric dipole antenna has been proposed, but this dual-band magnetoelectric dipole antenna has a relatively large volume, and the profile of the antenna is relatively high, which cannot meet the requirements of miniaturization. In the follow-up research, the dielectric plate was combined with the magnetoelectric dipole antenna, which greatly reduced the profile height of the antenna, but on the other hand, it brought disadvantages such as narrowed operating bandwidth and reduced gain of the antenna.

Regarding the development of metasurface antennas, many researchers have devoted themselves to studying the combination of metasurfaces and antennas. The metasurface is used to suppress the lateral radiation of the antenna and enhance the forward radiation of the antenna, thereby increasing the gain of the antenna. By simulating the metasurface above the radiating antenna and rotating the metasurface around the center, the reconfigurable functions of the antenna, such as reconfigurable frequency and reconfigurable polarization, are realized. But the working bandwidth of this kind of metasurface antenna is very narrow.

[Content of the invention]

Aiming at the above technical deficiencies, the present invention proposes a novel dielectric plate metasurface magnetoelectric dipole antenna. .

A magnetoelectric dipole antenna applied to 5G communication of the present invention adopts the following technical scheme:

A magnetoelectric dipole antenna of a metasurface dielectric plate, comprising a first dielectric layer, a second dielectric layer, and a third dielectric layer, a pair of short-circuit columns and a vertical transmission line pass through the three dielectric layers, and the dielectric layer In the middle is the feed structure; a vertical transmission line and the feed structure are used to feed the magnetoelectric dipole antenna.

The lower surface of the third dielectric layer is a reflective ground, a pair of short-circuit columns and the reflective ground constitute a magnetic dipole, the upper surface of the third dielectric layer is a metasurface, and the metasurface is composed of "I"-shaped unit patches. Used to increase the gain of the antenna and reduce the height of the antenna;

The upper surface of the first dielectric layer is an electric dipole patch, and the middle of the electric dipole patch is a first layer of horizontal coupling strips, which are trapezoidal in shape.

Further, the feed structure is connected to one end of the horizontal coupling strip of the first layer through a transmission line, the other end of the horizontal coupling strip of the first layer is connected to the vertical coupling strip of the first layer, and the horizontal coupling strip of the second layer is connected below the vertical coupling strip of the first layer, Two vertical coupling strips are connected on both sides below the second horizontal coupling strip to increase the length of the current path in a limited space, thereby obtaining excellent impedance matching, widening the effective bandwidth, and reducing the profile height.

Furthermore, the electric dipole patch has arc-shaped sides and a zigzag slot in the middle, which is used to obtain the characteristics of double broadband.

Further, the dielectric boards are Rogers 5880 dielectric boards, the thickness of the first dielectric board is 1.52 mm, the thickness of the second dielectric board is 3.75 mm, and the thickness of the third dielectric board is 3.75 mm.

The invention widens the frequency band by designing slots of suitable shape on the electric dipole, and the range of the impedance bandwidth of the antenna is from 3.12GHz to 5.92GHz at low frequency and from 7.14GHz to 8.45GHz at high frequency (standing wave ratio<2). Gain fluctuates from 6.0dBi to 8.9dBi at low frequencies and from 6.7dBi to 9.6dBi at high frequencies. Within the entire working frequency band of the antenna, nearly symmetrical directional radiation patterns can be realized on the two radiation surfaces of the E plane and the H plane. On two different radiation planes, the antenna can achieve cross-polarization less than -22dB and front-to-back ratio greater than 20dB. In the present invention, the traditional magnetoelectric dipole antenna technology and metasurface technology are combined to realize the functions of wide frequency band, high gain, directional radiation and the like of the antenna.

[Description of drawings]

Fig. 1 shows the structure of the first dielectric layer of the antenna of the present invention.

Fig. 2 shows the structure of the second dielectric layer of the antenna of the present invention.

Fig. 3 shows the structure of the third dielectric layer of the antenna of the present invention.

Fig. 4 is a three-dimensional geometry structure of the antenna of the present invention.

Fig. 5 is a schematic diagram of the feeding structure of the antenna of the present invention.

Fig. 6 is the standing wave ratio and gain of the simulation results of the antenna of the present invention.

Fig. 7 is a dimension diagram of the antenna of the present invention.

Fig. 8 is a radiation pattern diagram of the antenna of the present invention.

Fig. 9 is a perspective view of the antenna of the present invention.

1 is the first dielectric layer, 2 is the second dielectric layer, 3 is the third dielectric layer, 4 is the electric dipole patch, 5 is the first short-circuit column, 6 is the second short-circuit column, 7 is the horizontal coupling strip, 8 is an I-type unit patch.

[Detailed ways]

In order to make the technical means realized by the present invention clear, the present invention will be further described below in conjunction with the accompanying drawings, wherein the terms "first", "second", "third" and so on are only used for descriptive purposes, and should not be interpreted as indications or hints Relative importance or implicit indication of the number of technical features indicated.

As shown in Figure 1-4, a magnetoelectric dipole antenna of a metasurface dielectric board includes a first dielectric layer 1, a second dielectric layer 2, and a third dielectric layer 3. The antenna is printed on a three-layer dielectric board. A pair of short-circuit columns 5, 6 and a vertical transmission line pass through the middle of the three dielectric layers, and the middle of the dielectric layer is a feed structure; a vertical transmission line and the feed structure are used to feed the magnetoelectric dipole antenna.

As shown in Figure 3, the lower surface of the third dielectric layer 3 is a reflective ground, a pair of short-circuit columns and the reflective ground constitute a magnetic dipole, the upper surface of the third dielectric layer is a metasurface, and the metasurface is composed of "I" type units Composed of patches, it is used to increase the gain of the antenna and reduce the height of the antenna; the main principle is that the periodic unit structure of the metasurface makes energy reflect multiple times between the magnetoelectric dipole and the metasurface, thereby improving the antenna gain; At the same time, the metasurface can reduce the effective electrical length, thereby reducing the height of the antenna. In this embodiment, there are 4×8 “I”-shaped unit patches in total, and a plurality of I-shaped unit patches constitute a metasurface, which increases the gain of the antenna and reduces the height of the antenna.

As shown in FIG. 1 , the upper surface of the first dielectric layer 1 is an electric dipole patch 4 , and the middle of the electric dipole patch 4 is a horizontal coupling strip 7 connected to the feed structure. The electric dipole patch 4 has arc-shaped sides and a zigzag slot in the middle, which is used to obtain the characteristics of double broadband.

Figure 4 also magnifies the structure of the horizontal coupling strip 7, which is a trapezoidal shape. The longer bottom of the trapezoid corresponds to an opening for a transmission line for connecting the feed structure. The shorter bottom of the trapezoid has a smaller opening. , used to connect the feed structure and extend to the second dielectric layer 2 below.

As shown in FIG. 2 , the second dielectric layer 2 has two short-circuit post holes in the middle, which are used for the passage of the short-circuit posts 5 and 6 and the two connection points extended from the feed structure. As shown in Figure 5, the feed structure is connected to one end of the first layer of horizontal coupling strips through a transmission line, the other end of the first layer of horizontal coupling strips is connected to the first layer of vertical coupling strips, and the bottom of the first layer of vertical coupling strips is connected to the second layer of horizontal coupling strips. Two vertical coupling strips are connected on both sides below the second horizontal coupling strip to increase the length of the current path in a limited space, thereby obtaining excellent impedance matching, widening the effective bandwidth, and reducing the profile height.

The dielectric board shown above is a Rogers 5880 dielectric board. The thickness of the first dielectric board is 1.52mm, the thickness of the second dielectric board is 3.75mm, and the thickness of the third dielectric board is 3.75mm. The size of the entire antenna unit is 60×60× 7.92mm ³ .

Fig. 6 is the standing wave ratio and gain of the simulation results of the antenna of the present invention. Fig. 7 shows the specific parameters of the dimensions of the antenna of the embodiment of the present invention. Fig. 8 is the radiation pattern of the antenna of the present invention. /WLAN/X-Band under the multi-input multi-output application, in order to obtain the characteristics of low profile, the radiation electric dipole and the short-circuit wall are embedded in different heights of the multi-layer board medium. Different from conventional metamaterial surface antennas, we achieved broadband and directional characteristics by introducing a modified zigzag electromagnetic dipole antenna. At the same time, the combination of the metamaterial surface and the electromagnetic dipole antenna significantly improves the gain of the antenna. Finally, thanks to the three-dimensional hexagonal structure, the MIMO antenna system has good ECC (Envelope Correlation Coefficient) and MEG (Mean Effective Gain) performance, and can achieve 360° directional full coverage in the entire working frequency band superior performance. The antenna unit can achieve 62.1% (3.12-5.92GHz) impedance bandwidth and 7.48±1.43dBi stable gain in the low frequency band, and 16.8% (7.14-8.45GHz) impedance bandwidth and 8.18±1.43dBi gain in the high frequency band . The size of the antenna unit is 60×60×7.92mm3. Therefore, this antenna is likely to be suitable for directional communication with multiple inputs and multiple outputs under 5G/WiMA/WLAN/X-Band.

All technical solutions belonging to the principles of the present invention belong to the protection scope of the present invention. For those skilled in the art, some improvements made without departing from the principle of the present invention should also be regarded as the protection scope of the present invention.

Claims (4)

1. A kind of 1. magnetoelectricity dipole antenna of super surface dielectric plate, it is characterised in that comprising first medium layer, second dielectric layer, 3rd dielectric layer, there is a pair of short-circuit posts and a vertical transmission line to pass through among three dielectric layers, in addition to electric dipole and Magnetic dipole, dielectric layer centre is feed structure；One vertical transmission line and feed structure are used to give magnetoelectricity dipole day Line is fed

   The 3rd dielectric layer lower surface is reflectingly, a pair of short-circuit posts with constituting magnetic dipole, the 3rd dielectric layer reflectingly Upper surface is super surface, and super surface is made up of the unit paster of " I " type, for improving the gain of antenna and reducing the height of antenna Degree；

   The first medium layer upper surface is electric dipole paster, is the horizontal strap of first layer among electric dipole paster, is in Trapezoidal shape.
2. A kind of 2. magnetoelectricity dipole antenna of super surface dielectric plate according to claim 1, it is characterised in that the feed Structure connects the horizontal strap one end of first layer, the vertical coupling of the horizontal strap other end connection first layer of first layer by transmission line Crossed belt, the vertical coupled band lower section connection horizontal strap of the second layer of first layer, the both sides connection two below the second horizontal strap Individual vertical coupled band, increases current path length in the confined space, so as to obtain excellent impedance matching, widens effective band Width, reduce section height.
3. A kind of 3. magnetoelectricity dipole antenna of super surface dielectric plate according to claim 1, it is characterised in that the galvanic couple Extremely sub- paster is arc-shaped side, and centre is the zigzag line of rabbet joint, the characteristics of for obtaining double wideband.
4. A kind of 4. magnetoelectricity dipole antenna of super surface dielectric plate according to claim 1, it is characterised in that the medium Plate is Rogers 5880 dielectric-slab, and first medium plate thickness is 1.52mm, second medium plate thickness is 3.75mm, and the 3rd is situated between Scutum thickness is 3.75mm.