Adjacent-frequency decoupling dielectric strip filtering antenna array

Abstract

The invention discloses an adjacent-frequency decoupling dielectric strip filtering antenna array. A top dielectric patch layer comprises a plurality of high-dielectric-constant strip-type dielectric patches which are arranged in parallel at intervals. A signal is fed into the metal strip of the loading branch knot on the middle layer through probe feeding, the half-wavelength mode of the metal strip of the loading branch knot is excited, and the TM10 mode of the strip type dielectric patch on the top layer is coupled and excited, so that a radiation frequency band with two resonance points is formed; and by adjusting the size of the top-layer strip-type dielectric patch, the working frequency bands of the two adjacent filtering antennas are respectively arranged on the working stop bands of each other, so that the designed antenna has the functions of filtering and adjacent-frequency mutual coupling removal at the same time, and the effects of small spacing, low profile and high efficiency are achieved.

Description

TECHNICAL FIELD

[0001] The present application relates to a wireless communication device, in particular to a high-efficiency dielectric strip filter antenna with adjacent frequency decoupling characteristics. BACKGROUND

[0002] A filter antenna is a multifunctional element that integrates filtering and radiation functions, which can not only miniaturize the system itself, but also reduce the space between systems due to its ability to reduce mutual coupling. Compared with traditional metal patch antennas, dielectric resonator antennas have the advantages of low loss, high Q value, and design freedom; dielectric strip antennas are smaller than dielectric resonator antennas. When different frequency band antennas form a multi-element antenna array, the capacity, transmission reliability, and frequency coverage of the channel can be improved, but the mutual interference between different frequency band antennas can affect the antenna, including matching deterioration, pattern distortion, and reduced radiation performance. Therefore, it is valuable to study a high-efficiency dielectric strip filter antenna with adjacent frequency decoupling characteristics.

[0003] Current methods for reducing the mutual coupling between adjacent frequency band antennas can be divided into two categories: the first method blocks high-frequency and low-frequency antennas by changing the spatial arrangement of the antennas. Although this method can effectively reduce the mutual coupling between adjacent frequencies, it increases the complexity and space occupation of the system. The second method uses filter antennas to reduce the mutual coupling between adjacent frequency band antenna elements. Most of the adjacent frequency decoupling antennas using the above methods work in 0.30λ0-0.5λ0, λ0 is the free space wavelength corresponding to the center frequency, and there is less research on adjacent frequency decoupling of dielectric antennas. Therefore, it is necessary to design a compactly arranged dielectric strip filter antenna with adjacent frequency decoupling characteristics. SUMMARY

[0004] The present application relates to a wireless communication device, in particular to a high-efficiency dielectric strip filter antenna with adjacent frequency decoupling characteristics.

[0005] Technical solution: A kind of adjacent frequency decoupling medium strip filter antenna array, comprising: top layer medium patch layer, upper layer low dielectric constant substrate layer, middle metal layer, lower layer low dielectric constant substrate layer are sequentially stacked, and further comprising feed probe group;Top layer medium patch layer includes a plurality of high dielectric constant strip type medium patches arranged in parallel and spaced apart;Several non-metalized vias are loaded on the strip type medium patch in the length direction respectively;The middle metal layer includes a plurality of metal strips, and each metal strip is respectively one-to-one opposite each strip type medium patch;The midpoint of each metal strip is loaded with a bent branch on both sides, and the bending direction of the branches on both sides of the metal strip is opposite;The feed probe group includes a plurality of feed probes;Each feed probe is vertically through the through hole on the lower layer low dielectric constant substrate layer from the bottom, and then corresponds to the metal strip of each loading branch;Signal is fed into the metal strip of loading branch in middle layer by probe feed, excites the half-wave mode of the metal strip of loading branch, then excites the TM 10 Mode of the strip type medium patch in top layer by coupling, thereby forming a radiation band with two resonance points;And the working frequency band of adjacent strip type medium patches is arranged on the working stop band of each other.

[0006] Further, the high dielectric constant is greater than 50, and the low dielectric constant is less than 5.

[0007] Further, two non-metalized vias are symmetrically loaded on the strip type medium patch in the length direction respectively.

[0008] Further, the size of the top layer strip type medium patch is adjusted so that the working frequency band of the adjacent strip type medium patches is arranged on the working stop band of each other.

[0009] Further, in the two adjacent strip type medium patches, the size of the strip type medium patch working at low frequency is: the length is 0.35 λ 0 ~ 0.36 λ 0, the width is 0.03 λ 0 ~ 0.04 λ 0, and the height is 0.05 λ 0 ~ 0.06 λ 0;The size of the strip type medium patch working at high frequency is: the length is 0.28 λ 0 ~ 0.29 λ 0, the width is 0.036 λ 0 ~ 0.037 λ 0, and the height is 0.048 λ 0 ~ 0.049 λ 0, λ 0 It is the air wave corresponding to the center frequency.

[0010] Beneficial effect: Most of the existing adjacent frequency decoupling antennas cannot be applied to close arrangement, and the efficiency is low, in addition, part of the antenna has the disadvantages of high design complexity, high cost and increased loss.The present application feeds signal into the metal strip of loading branch in middle layer by probe feed, excites the half-wave mode of the metal strip of loading branch, and excites the TM 10The mode is constituted to have two resonance points of the radiation frequency band, and the working frequency bands of the two strip-shaped dielectric patch antennas are arranged on the working stop band of each other by adjusting the size of the top strip-shaped dielectric patch, so that the designed antenna has the functions of filtering and adjacent frequency decoupling, and has the effects of small spacing, low profile and high efficiency.

[0011] Specifically, the signal is fed into the metal strip of the middle layer through the probe feed, the half-wave mode of the metal strip of the middle layer is excited, the TM 10 Mode of the top layer is excited through coupling, the open-circuit branch loaded on the metal strip can generate a radiation zero point at the low end, and the mutual coupling between the metal strip and the dielectric strip generates a high-end radiation zero point, so that the antenna has the functions of filtering and adjacent frequency decoupling, and has the effects of small spacing, low profile and high efficiency.

[0012] The arrangement mode of the antenna array is H-surface arrangement of two strip-shaped dielectric patches, and the width of the strip-shaped dielectric patch is small, and the open-circuit branch loaded on the metal strip is transformed into Z-shaped, so that the two antennas can be arranged at a smaller spacing, and the center spacing of the two strip-shaped dielectric patches is 0.20λ0.

[0013] Since the strip-shaped dielectric patch has a high-order mode of the dielectric which affects the performance of the antenna at high frequencies, the high-order mode of the strip-shaped dielectric patch is successfully suppressed by loading two non-metalized vias on the strip-shaped dielectric patch. BRIEF DESCRIPTION OF DRAWINGS

[0014] Figure 1 It is a profile structure schematic diagram of the dielectric strip filter antenna of the application; Figure 2 It is a top layer dielectric structure schematic diagram of the dielectric strip filter antenna of the application; Figure 3 It is a middle metal layer structure schematic diagram of the dielectric strip filter antenna of the application; Figure 4 It is a bottom metal layer structure schematic diagram of the dielectric strip filter antenna of the application; Figure 5 It is an S parameter diagram of the dielectric strip filter antenna of the embodiment of the application; Figure 6 It is a gain diagram of the dielectric strip filter antenna of the embodiment of the application; Figure 7 It is a radiation pattern of the dielectric strip filter antenna of the embodiment of the application; E / H It is a radiation pattern of the dielectric strip filter antenna of the embodiment of the application, wherein (a) corresponds to working at 4.8GHz, and (b) corresponds to working at 5.6GHz; Figure 8 It is an efficiency diagram of the dielectric strip filter antenna of the embodiment of the application. DETAILED DESCRIPTION

[0015] The invention will now be further explained with reference to the accompanying drawings.

[0016] A neighboring-channel decoupling dielectric strip filter antenna array, its 1×2 antenna array structure is as follows: Figure 1 As shown, it includes a top dielectric patch layer 1, an upper low dielectric constant substrate layer 2, an intermediate metal layer 3, and a lower low dielectric constant substrate layer 4 stacked in sequence, and also includes a power supply probe group 5.

[0017] like Figure 2 As shown, the top dielectric patch layer 1 is located on the surface of the upper low dielectric constant substrate layer 2, and is composed of strip-type dielectric patches 101 and 102 with high dielectric constant. The strip-type dielectric patches 101 and 102 are arranged in parallel at intervals.

[0018] The center-to-center spacing of the strip-type dielectric patches 101 and 102 is 0.20λ0, where λ0 is the air wave corresponding to the center frequency.

[0019] The dimensions of the strip-type dielectric patch 101 are as follows: the length along the y-axis is 0.35λ0~0.36λ0, the width along the x-axis is 0.03λ0~0.04λ0, and the height along the z-axis is 0.05λ0~0.06λ0.

[0020] The dimensions of the strip-type dielectric patch 102 are as follows: the length along the y-axis is 0.28λ0~0.29λ0, the width along the x-axis is 0.036λ0~0.037λ0, and the height along the z-axis is 0.048λ0~0.049λ0.

[0021] On strip-type dielectric patches 101 and 102, several non-metallized vias are loaded along their length. The radius of the non-metallized via 103 on strip-type dielectric patch 101 is 0.013λ0~0.014λ0. The radius of the non-metallized via 104 on strip-type dielectric patch 102 is 0.009λ0~0.01λ0.

[0022] In this embodiment, each strip-type dielectric patch is provided with two non-metallized vias, which are symmetrically arranged about the centerline of the strip-type dielectric patch.

[0023] like Figure 3 As shown, the intermediate metal layer 3 is composed of metal strips 301 and 302 with loaded branches. Metal strips 301 and 302 are respectively directly opposite to strip-type dielectric patches 101 and 102. A bent branch is loaded at the midpoint of each side of each metal strip, and the bending directions of the branches on both sides are opposite.

[0024] The dimensions of metal strip 301 are as follows: Length along the y-axis: 0.22λ0~0.23λ0; Width along the x-axis: 0.037λ0~0.038λ0; Branch length along the x-axis: 0.16λ0~0.17λ0; Branch length along the y-axis: 0.10λ0~0.11λ0; Branch width: 0.01λ0~0.02λ0. The dimensions of metal strip 302 are as follows: Length along the y-axis: 0.19λ0~0.20λ0; Width along the x-axis: 0.035λ0~0.037λ0; Branch length along the x-axis: 0.14λ0~0.15λ; Branch length along the y-axis: 0.08λ0~0.09λ0; Branch width: 0.01λ0~0.02λ0.

[0025] like Figure 4 As shown, the feed probe group 5 consists of two feed probes. The two feed probes pass vertically through the vias 401 on the lower low dielectric constant substrate layer 4 from the bottom, and are then connected to the metal strips 301 and 302 of the loaded stubs.

[0026] In the above structure, "high dielectric constant" refers to a dielectric constant greater than 50, and "low dielectric constant" refers to a dielectric constant less than 5. Among the two high dielectric constant strip-type dielectric patches on the top layer, strip-type dielectric patch 101 operates at low frequency, and strip-type dielectric patch 102 operates at high frequency.

[0027] When the antenna is working, the signal is fed to the metal strips 301 and 302 of the intermediate metal layer 3 through two feed probes, which excites the metal strip with loaded branches, and then couples and excites two strip-type dielectric patches working in different frequency bands.

[0028] In the above process, the signal is fed to the metal strips 301 and 302 of the intermediate metal layer 3 through two feed probes, exciting the half-wavelength mode of the metal strips 301 and 302. At the same time, since the metal strips are loaded with quarter-wavelength open-circuit stubs, a low-end radiation null point is generated. The metal strips 301 and 302 couple and excite the TM of the two strip-type dielectric patches. 10 The antenna array exhibits excellent filtering characteristics due to the coupling and cancellation of the metal strips 301 and 302 with the loaded stubs and the two strip-type dielectric patches. This high-end radiation null is generated by the coupling and cancellation of the metal strips 301 and 302 in the intermediate metal layer 3, which in turn create a Z-shaped structure. Furthermore, the two strip-type dielectric patches operating in different frequency bands can be compactly arranged. Since the two strip-type dielectric patches operate in their respective stopbands, the antenna array provides good adjacent-channel isolation.

[0029] In this embodiment, the metal material is copper; the low dielectric constant substrate has a dielectric constant of 3.55 and a loss angle of 0.0027; the high dielectric constant strip-type dielectric patches 101 and 102 are made of ceramic, with a dielectric constant of 89.5 and a loss angle of 0.0006. The dimensions of strip-type dielectric patch 101 are: length 0.35λ0, width 0.03λ0, and height 0.05λ0; the dimensions of strip-type dielectric patch 102 are: length 0.28λ0, width 0.036λ0, and height 0.048λ0; the radius of non-metallized via 103 is 0.013λ0, and the radius of non-metallized via 104 is 0.009λ0; the dimensions of the metal strip 301 are: length 0.22λ0. The metal strip 301 has a length of 0.16λ0 along the x-axis, a length of 0.10λ0 along the y-axis, and a width of 0.01λ0. The metal strip 302 has the following dimensions: a length of 0.19λ0 and a width of 0.035λ0. The metal strip 302 has a length of 0.15λ0 along the x-axis, a length of 0.08λ0 along the y-axis, and a width of 0.01λ0.

[0030] The S-parameters of the antenna in this embodiment are as follows: Figure 5 As shown, the 10dB impedance matching bandwidth is 5.03% (4.72GHz – 4.95GHz) when operating at 4.8GHz, and 4.7% (5.48GHz – 5.74GHz) when operating at 5.6GHz. The in-band isolation is improved from 12.9dB to 23.2dB.

[0031] like Figure 6 As shown in the antenna gain diagram, there is a radiation null point at both high and low frequencies, which improves the frequency selectivity of the antenna.

[0032] Figure 7 (a) is the antenna at 4.8 GHz. E / Simulated radiation pattern of H-plane E The 3-dB beamwidth in the H-plane is 85.6° / 89.7°. At this frequency, E The H-plane cross-polarization level is -25.7 dB / -20.1 dB. Figure 7 (b) is the antenna at 5.6 GHz. E / Simulated radiation pattern of H-plane E The 3-dB beamwidth in the H plane is 85.9° / 93.5°, and at this frequency, the cross-polarization level in the E / H plane is -16.2dB / -18.1dB.

[0033] Figure 8The diagram shows the efficiency of the antenna in this embodiment, where it can be seen that the efficiency of both frequency bands reaches 87%.

[0034] The above description is only a preferred embodiment of the present invention. It should be noted that for those skilled in the art, several improvements and modifications can be made without departing from the principle of the present invention, and these improvements and modifications should also be considered within the scope of protection of the present invention.

Claims

1. A neighboring-channel decoupling dielectric stripe filter antenna array, characterized in that, include: The material consists of a top dielectric patch layer (1), an upper low dielectric constant substrate layer (2), an intermediate metal layer (3), and a lower low dielectric constant substrate layer (4), which are stacked in sequence, and also include a power supply probe group (5). The top dielectric patch layer (1) includes several strip-type dielectric patches with high dielectric constant arranged in parallel; several non-metallized vias are loaded on the strip-type dielectric patches in the length direction respectively; The intermediate metal layer (3) includes several metal strips, each of which is directly opposite to each strip-type dielectric patch; a bent branch is loaded at the midpoint on both sides of each metal strip, and the bending directions of the branches on both sides of the metal strip are opposite. The feed probe group (5) includes several feed probes; each feed probe passes vertically through the through hole on the lower low dielectric constant substrate layer (4) from the bottom and is connected to the metal strip of each loaded branch. The signal is fed into the metal strip of the loaded stub in the middle layer via probe feeding, exciting the half-wavelength mode of the metal strip of the loaded stub, and then the TM of the strip-type dielectric patch in the top layer is excited by coupling. 10 The pattern is thus formed to create a radiation frequency band with two resonant points; and the operating frequency bands of adjacent strip-type dielectric patches are respectively set on each other's operating stopbands.

2. The adjacent-channel decoupling dielectric strip filter antenna array according to claim 1, characterized in that, The high dielectric constant is defined as an electrical constant greater than 50, and the low dielectric constant is defined as an electrical constant less than 5.

3. The adjacent-channel decoupling dielectric strip filter antenna array according to claim 1, characterized in that, Two non-metallized vias are symmetrically loaded along the length of the strip-shaped dielectric patch.

4. The adjacent-channel decoupling dielectric strip filter antenna array according to claim 1, characterized in that, By adjusting the size of the top strip-type dielectric patch, the operating frequency bands of the adjacent strip-type dielectric patches are respectively set on each other's operating stopbands.

5. The adjacent-channel decoupling dielectric strip filter antenna array according to claim 4, characterized in that, In two adjacent strip-type dielectric patches, the dimensions of the strip-type dielectric patch operating at low frequency are: length 0.35λ0~0.36λ0, width 0.03λ0~0.04λ0, and height 0.05λ0~0.06λ0; the dimensions of the strip-type dielectric patch operating at high frequency are: length 0.28λ0~0.29λ0, width 0.036λ0~0.037λ0, and height 0.048λ0~0.049λ0, where λ0 is the air wave corresponding to the center frequency.

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