CN106505316B

CN106505316B - Multilayer planar antenna array

Info

Publication number: CN106505316B
Application number: CN201611257581.2A
Authority: CN
Inventors: 陈志兴; 李雨键; 达山; 刘沛业; 章玉涛
Original assignee: Guangdong Shenglu Telecommunication Tech Co Ltd
Current assignee: Guangdong Shenglu Communication Co Ltd; Guangdong Shenglu Telecommunication Tech Co Ltd
Priority date: 2016-12-30
Filing date: 2016-12-30
Publication date: 2021-06-25
Anticipated expiration: 2036-12-30
Also published as: CN106505316A

Abstract

The invention discloses a multilayer planar antenna array, which is characterized by comprising a plurality of dielectric plates and interlayer metal plates, wherein the dielectric plates are respectively integrated with a double-layer feed network (comprising integrated air waveguides) and partial antenna structures, the interlayer metal plates are covered between the two adjacent dielectric plates, and the interlayers are coupled by using gaps; the lower layer of the double-layer feed network is an air waveguide power division network, the upper layer of the double-layer feed network is an SIW feed network, and a dielectric plate and an interlayer metal plate layer are pressed into a complete antenna. The invention has simple structure, low transmission loss, cost saving while maintaining performance, wide bandwidth, easy processing and high gain compared with the products of the same type.

Description

Multilayer planar antenna array

Technical Field

The invention relates to the technical field of antennas, in particular to a planar antenna array fed by using a hybrid multilayer structure.

Background

The performance of the millimeter wave antenna, which is one of the key devices in the millimeter wave wireless communication system, directly affects the performance level of the whole system, and the key technical points in the millimeter wave frequency band are processing precision and complexity, cost, volume, bandwidth, gain and the like. The existing millimeter wave antenna array is widely applied due to the advantages of low profile, high gain, easy integration and the like. The millimeter wave antenna array is mainly divided into two parts, namely a feed network and a radiation unit, and the existing antenna array types have certain defects in a certain aspect of required performance, such as: according to the feed network division, the antenna array using the conventional metal waveguide feed has the minimum transmission loss, but the feed structure is high in processing cost, while the array using the strip line feed has low processing cost and easy integration, but the loss is high, and the cost and the loss of the substrate integrated waveguide feed are between the two.

According to the radiation unit, the traditional radiation unit has the advantage of low processing difficulty, but the slot antenna array has narrow bandwidth, the cavity-backed antenna has large volume and the patch antenna has strong surface wave. Therefore, the millimeter wave antenna array needs to be optimized for the contradiction between the feed network performance and the cost, and a radiating element with more excellent radiation performance is needed.

Disclosure of Invention

The invention aims to solve the defects of the prior art and provides a multilayer planar antenna array which is low in processing cost, high in integration level, wide in bandwidth and high in gain.

The invention adopts the following technical scheme to realize the purpose: a multilayer plane antenna array is characterized by comprising a plurality of dielectric plates and interlayer metal plates, wherein the dielectric plates are respectively integrated with a double-layer feed network (including integrated air waveguides) and partial antenna structures, the interlayer metal plates are covered between the two adjacent dielectric plates, and gaps are used for coupling; the lower layer of the double-layer feed network is an air waveguide power division network, the upper layer of the double-layer feed network is an SIW feed network, and the dielectric plate and the interlayer metal plate layer are pressed into a complete antenna.

Furthermore, the radiating element comprises two layers of dielectric plates, three layers of metal plates and one layer of insulating plate, wherein the first layer of dielectric plate is integrated with a plurality of groups of radiating elements; the second dielectric plate is integrated with a substrate integrated waveguide, and the insulating plate is positioned below the second dielectric plate and integrated with an air waveguide.

Furthermore, every four electric dipole antennas are in a group and distributed in four corners, a short-circuit strip is connected between two electric dipole antennas arranged diagonally, and the two groups of short-circuit strips are connected into a whole in a cross mode.

Furthermore, the electric dipole antenna has the thickness of 0.03-0.05mm, the whole structure is square, and the length is 1-2 mm; the dipole is tubular and has an outer diameter of 0.2-0.3 mm.

Furthermore, the metal plate is a copper plate, the thickness of the metal plate is 0.03-0.05mm, a coupling gap is etched on the metal plate, and the length and the width of the gap are respectively 1-2mm and 0.3-0.5 mm.

Furthermore, the second layer of dielectric plate is Rogers4350B and has a thickness of 0.5-0.6 mm.

Furthermore, the insulating plate is made of FR4 and has a thickness of 0.4-0.6 mm.

Further, the bottom of the metal plate at the lowest layer is provided with an input switching structure which is used as an input port and connected with the input end of the air waveguide.

The invention adopts the technical proposal to achieve the following beneficial effects:

1. the invention has low transmission loss, maintains the performance and saves the cost. The maximum optimization between performance and cost is achieved by adopting a double-layer feed network for feeding, using a high-cost integrated air waveguide on a lower-layer feed network with long transmission length and using a low-cost substrate integrated waveguide on a sub-network with short transmission length on an upper layer.

2. The electromagnetic dipole antenna has wide bandwidth and excellent use performance, is low in processing difficulty and has far wider bandwidth than the traditional antenna.

3. The processing is easy. The PCB technology is used, simple gap coupling is used between layers, all structures are integrated in the medium substrate, no structure with high requirements on processing precision exists, and processing cost is greatly saved in millimeter wave device processing.

4. The gain is high. Due to the small size, a large-scale antenna array can be manufactured, and therefore the gain is high.

Drawings

FIG. 1 is a three-dimensional block diagram of the present invention;

FIG. 2 is a side view of the present invention;

FIG. 3 is a top view of layer 1 of an embodiment of the present invention;

FIG. 4 is a top view of layer 2 of an embodiment of the present invention;

FIG. 5 is a top view of layer 3 of an embodiment of the present invention;

FIG. 6 is a top view of layer 4 of an embodiment of the present invention;

FIG. 7 is a top view of layer 5 of an embodiment of the present invention;

FIG. 8 is a top view of layer 6 of an embodiment of the present invention;

FIG. 9 is a top view of layer 7 of an embodiment of the present invention;

FIG. 10 is a three-dimensional block diagram of a radiating element according to the present invention;

FIG. 11 is a side view of a radiating element of the present invention;

FIG. 12 is the S parameter design result of the present invention;

fig. 13 is a 71GHZ frequency point radiation pattern of the present invention;

fig. 14 is a 78GHZ frequency radiation pattern of the present invention;

fig. 15 is the 86GHZ frequency radiation pattern of the present invention.

Detailed Description

The technical solution is described in detail with reference to specific embodiments below.

As shown in fig. 1-2, the present invention is a multilayer planar antenna array, which includes several dielectric plates integrated with a double-layer feed network and an integrated air waveguide, and an interlayer metal plate disposed between two adjacent dielectric plates, wherein the interlayer is coupled by a gap; the upper layer is a 2 x 4 subarray, the lower layer in the double-layer feed network is a 4 x 2 air waveguide power division network, the upper layer is a 2 x 4 subarray, the SIW feed network, the dielectric plate and the interlayer metal plate layer are pressed into a complete antenna, and the metal partition plate is shared between the layers in the combination mode, so that the cost is saved.

The multi-layer antenna array in this embodiment has a 7-layer combined structure.

As shown in fig. 3, in the first dielectric plate 2, there are multiple sets of electric dipole antennas 22 of the radiation elements 1, the thickness of which is 0.035mm, the overall structure of which is square, and the length of which is 1.7 mm.

As shown in fig. 4, the first dielectric slab is made of Rogers4350B, has a thickness of 0.508mm, and has dipoles 23 integrated therein, and a dipole radius of 0.27 mm; the structure of the whole radiating unit is that electric dipole antennas 22 and dipoles 23 in fig. 10 and 11 are combined, every four electric dipole antennas are in a group and are distributed in four corners, a short-circuit strip 21 is connected between two electric dipole antennas 22 arranged diagonally, and the whole radiating unit is made of copper, as shown in fig. 10 and 11.

As shown in fig. 5, the thickness of the copper plate 3 disposed below the first dielectric plate is 0.035mm, and the coupling gap 10 is etched on the copper plate, and the length and width of the gap are 1.4mm and 0.4mm respectively.

As shown in fig. 6, the second dielectric plate 4 is made of Rogers4350B and has a thickness of 0.508mm, wherein a substrate integrated waveguide is integrated therein as a 2 × 4 sub-array feed network, the width of the substrate integrated waveguide is 1.4825mm, the space between two adjacent vertical pillars 11 in the figure is 0.55mm, and the diameter of the vertical pillar is 0.3 mm. The

posts

12, 13 serve to adjust the network impedance match, the post 12 is 0.25mm in diameter, and the post 14 serves to adjust the energy coupling of the coupling slot 10.

As shown in fig. 7, the thickness of the copper plate 5 arranged below the second dielectric plate is 0.035mm, and the coupling gap 15 is etched on the copper plate, and the length and the width of the gap are respectively 1.3mm and 0.35 mm.

As shown in FIG. 8, the insulating plate 6 disposed below the copper plate shown in FIG. 7 is integrated with an air waveguide made of FR4 and having a thickness of 0.5 mm. The air waveguide is H-shaped, the left upper lateral part 16 of the air waveguide is 2.35mm wide, the right lower lateral part 18 of the air waveguide is a slot, the middle lateral part 17 is used for adjusting feed network impedance matching and adjusting energy coupling of the coupling slot 15, and the middle part of the middle lateral part 17 extends outwards to form a slot 19 and is used for adjusting input end energy coupling.

As shown in fig. 9, the bottom of the copper plate 7 is provided with an input adapter 20 which is used as an input port and is connected with the input end of the air waveguide, and the thickness of the copper plate is 0.035 mm.

Fig. 12 shows that the simulation result of the antenna impedance bandwidth can reach 25.5%. Fig. 13, 14, and 15 are diagrams of three frequency points across the bandwidth of the antenna, which are superior in the overall bandwidth pattern and have cross polarization lower than-40 dB at low and medium frequencies.

Compared with the prior art, the antenna array uses a double-layer feed network for feeding, the lower layer is a 4 multiplied by 2 air waveguide power division network, the upper layer is a 2 multiplied by 4 sub-array, the SIW feed network is used, the antenna radiation unit uses a magnetoelectric dipole antenna, copper plates are used as intervals between layers, a dielectric plate and the copper plates are etched firstly during processing, and finally the complete antenna is laminated.

The foregoing is only a preferred embodiment of the present invention, and it should be noted that, for those skilled in the art, various changes and modifications can be made without departing from the inventive concept of the present invention, and these changes and modifications are all within the scope of the present invention.

Claims

1. A multilayer planar antenna array is characterized by comprising two dielectric plates, a three-layer metal plate and an insulating plate, wherein the two dielectric plates are respectively integrated with a double-layer feed network and an integrated air waveguide, the three-layer metal plate and the insulating plate are arranged between the two adjacent dielectric plates, and the layers are coupled by using a gap; the first dielectric plate is integrated with a plurality of groups of radiating elements; the second layer of dielectric plate is integrated with a substrate integrated waveguide, and the insulating plate is positioned below the second layer of dielectric plate and is integrated with an air waveguide; the lower layer of the double-layer feed network is an air waveguide power division network, the upper layer of the double-layer feed network is an SIW feed network, and a dielectric plate and an interlayer metal plate layer are pressed into a complete antenna;

and the bottom of the lowermost metal plate is provided with an input switching structure which is used as an input port and connected with the input end of the air waveguide.

2. The multi-layer planar antenna array as claimed in claim 1, wherein the radiating elements comprise electric dipole antennas, dipoles connected to the bottom of the electric dipole antennas.

3. The multi-layered planar antenna array as claimed in claim 2, wherein each four electric dipole antennas are grouped into a group, the group is distributed in four corners, short-circuit strips are connected between two electric dipole antennas which are diagonally arranged, and the two groups of short-circuit strips are connected into a whole in a cross-connection manner.

4. The multi-layer planar antenna array of claim 2, wherein the electric dipole antenna has a thickness of 0.03-0.05mm, a square overall structure, and a length of 1-2 mm; the dipole is tubular and has an outer diameter of 0.2-0.3 mm.

5. The multi-layered planar antenna array as claimed in claim 1, wherein the metal plate is a copper plate with a thickness of 0.03-0.05mm, and has coupling slots etched therein, the slots having a length and width of 1-2mm and 0.3-0.5mm, respectively.

6. The multi-layer planar antenna array as claimed in claim 1, wherein the second layer of dielectric sheet material is Rogers4350B and has a thickness of 0.5-0.6 mm.

7. The multi-layer planar antenna array as claimed in claim 1, wherein the dielectric plate is made of FR4 and has a thickness of 0.4-0.6 mm.