Broadband mutual coupling removal dielectric resonator antenna

Abstract

The invention discloses a broadband mutual-coupling-removing dielectric resonator antenna which comprises a top dielectric structure, an upper low-dielectric-constant substrate layer, a middle metal layer structure, a lower low-dielectric-constant substrate layer and a bottom metal structure which are sequentially stacked from top to bottom. The decoupling function is achieved by adding the long-strip-shaped dielectric block perpendicular to the two long-strip-shaped dielectric resonator antenna units of the top-layer dielectric structure between the two long-strip-shaped dielectric resonator antenna units of the top-layer dielectric structure, and therefore the purposes of broadband and full-band decoupling and simple structure are achieved.

Description

Technical Field

[0001] The invention relates to a microwave communication device, in particular to a dielectric resonator antenna. Background Art

[0002] In antenna design, multiple antenna units are usually combined into a phased array or MIMO antenna to meet the high gain and wide scanning range required by communication equipment. Among them, the multiple-input multiple-output (MIMO) system has been widely used in the fifth generation of communications due to its large channel capacity and high data rate. As one of the key components of the MIMO system, broadband antenna arrays have received increasing attention in recent years due to their good isolation and good beam control characteristics.

[0003] In phased array or MIMO systems, due to limited space, antennas will be designed to have a small distance between units. However, due to the inevitable strong coupling between systems, system performance will be degraded. Therefore, how to effectively suppress the mutual coupling of broadband antennas has become a hot topic of research. On the other hand, dielectric resonator antennas have the advantages of strong anti-interference and wide applicability due to the absence of conductor loss in dielectric materials, as well as the characteristics of small size and high efficiency of dielectric resonator antennas. Therefore, it is necessary to study broadband decoupled dielectric resonator antennas.

[0004] Most of the existing decoupled dielectric resonator antennas reduce the mutual coupling between units by adding additional structures or circuits outside the antenna, including periodic structures, defective ground structures, parasitic elements, reflective surfaces, neutralization lines, decoupling networks, etc. Some of these decoupled dielectric resonator antennas have too narrow frequency bands, large cross-sections, complex structures, or some antennas cannot achieve full-band decoupling. Summary of the invention

[0005] Purpose of the invention: In view of the above-mentioned prior art, a broadband decoupled dielectric resonator antenna is proposed which realizes broadband, has a simple structure and full-band decoupling.

[0006] Technical solution: A broadband decoupled dielectric resonator antenna, comprising: a top dielectric structure, an upper low dielectric constant substrate layer, an intermediate metal layer structure, a lower low dielectric constant substrate layer, and a bottom metal structure, which are stacked in sequence from top to bottom; The top dielectric structure is composed of dielectric strips 1 to 4, dielectric strips 1 and 2 are of the same size and parallel to each other, and dielectric strips 3 and 4 are of the same size and parallel to each other; dielectric strips 1 and 2 are perpendicular to dielectric strips 3 and 4, respectively, and are located on both sides of dielectric strips 3 and 4; The middle metal layer structure is a metal layer provided with a rectangular groove 1 and a rectangular groove 2, wherein the rectangular groove 1 and the rectangular groove 2 are respectively perpendicular to and directly opposite to the dielectric strip 3 and the dielectric strip 4; The bottom metal structure consists of a microstrip feed line 1 and a microstrip feed line 2 which are perpendicular to the rectangular slot 1 and the rectangular slot 2 respectively.

[0007] Furthermore, the material of the dielectric strips one to four is ceramic, and the dielectric constant is 10.2.

[0008] Furthermore, the length of dielectric strip one and dielectric strip two is 0.32λ0~0.33λ0, the width is 0.13λ0~0.14λ0, and the height is 0.09λ0~0.1λ0; the length of dielectric strip three and dielectric strip four is 0.68λ0~0.69λ0, the width is 0.16λ0~0.17λ0, and the height is 0.09λ0~0.1λ0.

[0009] Furthermore, the center distance between the dielectric strip 1 and the dielectric strip 2 is 0.34λ0-0.35λ0, and the center distance between the dielectric strip 3 and the dielectric strip 4 is 0.91-0.92λ0.

[0010] Furthermore, the length of the rectangular groove 1 and the rectangular groove 2 is between 0.32λ0 and 0.33λ0, and the width is between 0.009λ0 and 0.01λ0.

[0011] Beneficial effects: The present invention realizes the decoupling function by adding a long strip dielectric block perpendicular to the two long strip dielectric resonator antenna units, thereby achieving the purpose of wide-band, full-band decoupling and simple structure.

[0012] Specifically, the dielectric strips 1 and 2 are parallel to each other and perpendicular to the dielectric strips 3 and 4, and are located outside the dielectric strips 3 and 4, which can effectively absorb the signal transmission between the dielectric strips 3 and 4 and achieve the effect of decoupling.

[0013] The dielectric strips 3 and 4 are parallel to each other, perpendicular to the coupling slots 11 and 10, and parallel to the microstrip feed lines 9 and 8, which can effectively excite the TM of the dielectric strips 3 and 4. 10 Modulo and Reverse TM 20 mode to achieve the broadband radiation characteristics of the antenna. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 It is a schematic cross-sectional structure diagram of a broadband decoupled dielectric resonator antenna of the present invention; Figure 2 It is a schematic diagram of the top view of the structure of the broadband decoupling dielectric resonator antenna of the present invention; Figure 3 This is a schematic diagram of the structure of the intermediate metal layer of the broadband decoupled dielectric resonator antenna of the present invention; Figure 4 It is a schematic diagram of the structure of the broadband decoupling dielectric resonator antenna of the present invention when viewed from above; Figure 5 is a graph of S parameters and coupling level of the antenna of the embodiment; Figure 6 For example, the antenna is at 4.9 GHz E Simulation direction diagram of the surface; Figure 7 For example, the antenna is at 4.9 GHz H Simulation direction diagram of the surface. DETAILED DESCRIPTION

[0015] The present invention will be further explained below in conjunction with the accompanying drawings.

[0016] like Figure 1 As shown, a broadband decoupled dielectric resonator antenna includes a top dielectric structure, an upper low dielectric constant substrate layer 5, an intermediate metal layer structure 6, a lower low dielectric constant substrate layer 7, and a bottom metal structure which are stacked in sequence from top to bottom.

[0017] like Figure 2 As shown, the top dielectric structure is composed of dielectric strips 1 to 4. Dielectric strips 1 and 2 are of the same size and parallel to each other, and dielectric strips 3 and 4 are of the same size and parallel to each other. Dielectric strips 1 and 2 are perpendicular to dielectric strips 3 and 4 and are located on both sides of dielectric strips 3 and 4. Dielectric strips 1 and 2 serve as decoupling dielectric blocks, and dielectric strips 3 and 4 serve as wide-band dielectric resonators.

[0018] Among them, the material of dielectric strips 1 to 4 is ceramic, and the dielectric constant is 10.2. The length of dielectric strips 1 and 2 is 0.32λ0~0.33λ0, the width is 0.13λ0~0.14λ0, and the height is 0.09λ0~0.1λ0; the length of dielectric strips 3 and 4 is 0.68λ0~0.69λ0, the width is 0.16λ0~0.17λ0, and the height is 0.09λ0~0.1λ0. The center spacing of dielectric strips 1 and 2 is between 0.34λ0~0.35λ0, and the center spacing of dielectric strips 3 and 4 is between 0.91 and 0.92λ0, and λ0 is the wavelength of air at a frequency of 4.9GHz.

[0019] like Figure 3 As shown, the intermediate metal layer structure 4 is a metal layer etched with rectangular grooves 10 and 11, the length of the grooves is between 0.32λ0 and 0.33λ0, and the width is between 0.009λ0 and 0.01λ0. The rectangular grooves 10 and 11 are perpendicular to and face the dielectric strips 3 and 4 respectively.

[0020] like Figure 4 As shown, the bottom metal structure consists of microstrip feed lines 8 and 9 perpendicular to rectangular slots 10 and 11 respectively.

[0021] When the antenna is working, the signal is fed in through the bottom microstrip feed lines 8 and 9, and coupled to the top dielectric strips 3 and 4 with high dielectric constant through the rectangular slots 10 and 11, which stimulate the TM of the broadband dielectric resonant strips. 10 Modulo and Reverse TM 20 The resonance points of the two modes are located in the same frequency band, achieving wide-band radiation.

[0022] Decoupling dielectric blocks are added on both sides between the wide-band dielectric resonators. When the dielectric resonator on one side is working, part of the energy is coupled to the added dielectric strips 1 and 2, reducing the propagation of surface waves, thereby reducing the coupling to the dielectric resonator antenna on the other side, thereby achieving a decoupling function.

[0023] The dielectric substrate of this embodiment adopts a dielectric constant of 3.55 and a loss angle of 0.0027. The dielectric constant of the high dielectric constant dielectric material is 10.2 and the loss angle is 0.0023. The metal is copper and the thickness is 0.017mm. Specifically, the length of dielectric strips 3 and 4 is 41.5mm, the width is 9.8mm, and the height is 5.8mm; the length of dielectric strips 1 and 2 is 19.6mm, the width is 8mm, and the height is 5.8mm. The metal layer structure 4 is a metal layer etched with rectangular grooves 10 and 11, and the length of the groove is 19.6mm and the width is 0.6mm. The size of the entire substrate and metal layers 5, 6 and 7 is 60mm×90mm. The length of the metal microstrip line 8 is 43.5mm and the width is 2.05mm. The simulation results of the matching and mutual coupling level of the antenna under these parameters are shown as follows. Figure 5 The 10 dB impedance matching bandwidth of this embodiment is 29.2% (4.412 GHz – 5.844 GHz), the minimum isolation level within the working frequency band is -17.62 dB, and the maximum isolation level is -37.66 dB. Figure 6 , Figure 7 The antenna of this embodiment at 4.9GHz E / H Surface simulation radiation pattern, at this frequency point, E / H The cross-polarization level is -6.16 dB / -20.5 dB.

[0024] The above is only a preferred embodiment of the present invention. It should be pointed out that for ordinary technicians in this technical field, several improvements and modifications can be made without departing from the principle of the present invention. These improvements and modifications should also be regarded as the scope of protection of the present invention.

Claims

1. A broadband decoupled dielectric resonator antenna, characterized in that: include: A top dielectric structure, an upper low dielectric constant substrate layer (5), an intermediate metal layer structure (6), a lower low dielectric constant substrate layer (7), and a bottom metal structure are stacked in sequence from top to bottom; The top dielectric structure is composed of dielectric strips one to four, wherein dielectric strip one (1) and dielectric strip two (2) are of the same size and parallel to each other, and dielectric strip three (3) and dielectric strip four (4) are of the same size and parallel to each other; dielectric strip one (1) and dielectric strip two (2) are respectively perpendicular to dielectric strip three (3) and dielectric strip four (4), and are located on both sides of dielectric strip three (3) and dielectric strip four (4); The middle metal layer structure (4) is a metal layer provided with a rectangular groove 1 (10) and a rectangular groove 2 (11), wherein the rectangular groove 1 (10) and the rectangular groove 2 (11) are respectively perpendicular to and directly opposite to the dielectric strip 3 (3) and the dielectric strip 4 (4); The bottom metal structure is composed of a microstrip feed line 1 (8) and a microstrip feed line 2 (9) which are respectively perpendicular to the rectangular slot 1 (10) and the rectangular slot 2 (11).

2. The broadband decoupled dielectric resonator antenna according to claim 1, characterized in that: The material of dielectric strips one to four is ceramic, and the dielectric constant is 10.

2.

3. The broadband decoupled dielectric resonator antenna according to claim 1, characterized in that: The length of dielectric strip one (1) and dielectric strip two (2) is 0.32λ0~0.33λ0, the width is 0.13λ0~0.14λ0, and the height is 0.09λ0~0.1λ0; the length of dielectric strip three (3) and dielectric strip four (4) is 0.68λ0~0.69λ0, the width is 0.16λ0~0.17λ0, and the height is 0.09λ0~0.1λ0.

4. The broadband decoupled dielectric resonator antenna according to claim 3, characterized in that: The center distance between the dielectric strip one (1) and the dielectric strip two (2) is 0.34λ0~0.35λ0, and the center distance between the dielectric strip three (3) and the dielectric strip four (4) is 0.91~0.92λ0.

5. The broadband decoupled dielectric resonator antenna according to claim 3 or 4, characterized in that: The length of the rectangular groove 1 (10) and the rectangular groove 2 (11) is between 0.32λ0 and 0.33λ0, and the width is between 0.009λ0 and 0.01λ0.

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