A dual-frequency dual-polarization omnidirectional antenna

Abstract

The present invention discloses a dual-frequency dual-polarization omnidirectional antenna, comprising a first antenna substrate, a first antenna radiating unit, a second antenna substrate and the second antenna radiating unit, wherein the first antenna radiating unit is attached to the surface of the first antenna substrate, the second antenna radiating unit is attached to the surface of the second antenna substrate, a first through slot with an upper end opening is provided at a center right position of the upper end of the first antenna substrate, a second through slot with an lower end opening is provided at a center left position of the lower end of the second antenna substrate, the second antenna substrate is vertically inserted into the first through slot through the second through slot and vertically connected with the first antenna substrate in a cross direction, and does not affect the lead-out of a feed line, the first antenna radiating unit generates -45° polarized radiation, and the second antenna radiating unit generates +45° polarized radiation, thereby realizing the dual-frequency dual-polarization omnidirectional radiation of the antenna.

Description

Technical Field

[0001] The invention belongs to the field of indoor distributed antennas and radio frequency communications, and in particular relates to a dual-frequency dual-polarization omnidirectional antenna. Background Art

[0002] The rapid development of 5G communications has had a huge impact on the entire antenna industry. As a key part of indoor distributed communication antennas, WIFI communication antennas are also developing towards the integration of multiple antennas under the requirements of high speed, large capacity and low latency performance, and multi-antenna MIMO technology will also become mainstream. However, this also brings about multiple increases in cost and space, so the miniaturization of the antenna itself and the high isolation between antenna polarizations have become urgent issues to be solved.

[0003] The dual-band WIFI antenna covers the frequency band of 2400-2500MHz & 5150-5850MHz. In the existing dual-band WIFI antenna, if the PIFA spring form is adopted, it is difficult to take into account the dual-polarization performance, thus greatly reducing the communication efficiency; if the traditional PCB dipole form is adopted, the dual-band dual-polarization performance is limited. Moreover, because the antenna takes into account the low-frequency omnidirectional performance, the overall length is long and the polarization isolation is still poor. Summary of the invention

[0004] The purpose of the present invention is to provide a dual-frequency dual-polarization omnidirectional antenna to achieve dual-frequency dual-polarization omnidirectional radiation of the antenna.

[0005] To solve the above problems, the technical solution of the present invention is:

[0006] A dual-frequency dual-polarization omnidirectional antenna, comprising a first antenna substrate, a first antenna radiating unit, a second antenna substrate and a second antenna radiating unit:

[0007] The first antenna radiation unit is attached to the surface of the first antenna substrate, the first antenna radiation unit includes a first feed layer and four first antenna arms extending outward from two ends of the first feed layer, the four first antenna arms include two first long branches for transmitting 2.4G signals and two first short branches for transmitting 5G signals, one first long branch and one first short branch are symmetrically distributed at two ends of the first feed layer, the first long branch and the first short branch connected to one end of the first feed layer form an "F" shape as a whole, and the first feed layer, the first long branch and the first short branch work together to generate dual-frequency radiation;

[0008] The second antenna radiation unit is attached to the surface of the second antenna substrate, the second antenna radiation unit includes a second feed layer and four second antenna arms extending outward from two ends of the second feed layer, the four second antenna arms include two second long branches for transmitting 2.4G signals and two second short branches for transmitting 5G signals, one second long branch and one second short branch are respectively distributed at two ends of the second feed layer, the second long branch and the second short branch connected to one end of the second feed layer form an "F" shape as a whole, and the second feed layer, the second long branch and the second short branch work together to generate dual-frequency radiation;

[0009] A first through slot with an upper end opening is provided at the center and to the right of the upper end of the first antenna substrate, and a second through slot with an lower end opening is provided at the center and to the left of the lower end of the second antenna substrate. The second antenna substrate is vertically inserted into the first through slot through the second through slot and is cross-connected vertically with the first antenna substrate. The first antenna radiating unit generates -45° polarized radiation, and the second antenna radiating unit generates +45° polarized radiation.

[0010] Preferably:

[0011] The end of the first long branch is designed to be curved, and the first short branch is located inside the first long branch;

[0012] The end of the second long branch is designed to be bent, and the second short branch is located at the inner side of the second long branch.

[0013] Preferably:

[0014] The first long branch node is located above the first short branch node;

[0015] The second long branch node is located below the second short branch node.

[0016] Preferably, the lower right corner of the first antenna substrate is designed to be chamfered, and the lower left corner of the second antenna substrate is designed to be chamfered.

[0017] Preferably, the first antenna radiation unit further includes a first outer conductor connection point and a first inner conductor connection point, the first inner conductor connection point is externally connected to the inner conductor of the coaxial line, and the first outer conductor connection point is externally connected to the outer conductor of the coaxial line.

[0018] Preferably, the second antenna radiation unit further includes a second outer conductor connection point and a second inner conductor connection point, the second inner conductor connection point is externally connected to the inner conductor of the coaxial line, and the second outer conductor connection point is externally connected to the outer conductor of the coaxial line.

[0019] Preferably, the operating frequency bands covered by the dual-frequency dual-polarization omnidirectional antenna include 2400-2500 MHz and 5150-5850 MHz.

[0020] Due to the adoption of the above technical solution, the present invention has the following advantages and positive effects compared with the prior art:

[0021] 1) The present invention provides a dual-frequency dual-polarization omnidirectional antenna, comprising a first antenna substrate, a first antenna radiating unit, a second antenna substrate and the second antenna radiating unit, wherein the first antenna radiating unit is attached to the surface of the first antenna substrate, the second antenna radiating unit is attached to the surface of the second antenna substrate, a first through slot with an upper end opening is provided at a center right position of the upper end of the first antenna substrate, a second through slot with an lower end opening is provided at a center left position of the lower end of the second antenna substrate, the second antenna substrate is vertically inserted into the first through slot through the second through slot and is vertically connected to the first antenna substrate crosswise without affecting the lead-out of a feeder line, the first antenna radiating unit generates -45° polarized radiation, and the second antenna radiating unit generates +45° polarized radiation, thereby realizing dual-frequency dual-polarization omnidirectional radiation of the antenna.

[0022] 2) The present invention provides a dual-frequency dual-polarization omnidirectional antenna, in which the end of the first long branch is designed to be bent, and the first short branch is located on the inner side of the first long branch; the end of the second long branch is designed to be bent, and the second short branch is located on the inner side of the second long branch. The first long branch and the second long branch used to transmit 2.4G signals are bent, thereby greatly reducing the extension area of ​​the antenna, reducing the overall size of the antenna, miniaturizing the antenna, and reducing the cost of the antenna. The antenna occupies a small volume and has a simple structure. It can conform well to the indoor distributed environment and coexist with other indoor distributed antennas, and has a high application value.

[0023] 3) The present invention provides a dual-frequency dual-polarization omnidirectional antenna, in which the first long branch is located above the first short branch, and the second long branch is located below the second short branch. Considering that the polarization interference in the same frequency band is too large, the low-frequency radiation unit and the high-frequency radiation unit of the two antennas of the ±45° dual-polarization antenna are reversed up and down, thereby maximizing the distance between the radiation units in the same frequency band, directly improving the isolation in the same frequency band, improving the polarization purity and polarization efficiency of the antenna, achieving high-isolation communication quality, and truly realizing 5G performance with high speed, large capacity and low latency.

[0024] 4) The present invention provides a dual-frequency dual-polarization omnidirectional antenna, in which the lower right corner of the first antenna substrate is designed to be chamfered, and the lower left corner of the second antenna substrate is designed to be chamfered, so as to prevent antenna assembly errors, play a fool-proof role, and facilitate the application and installation of the antenna. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1An exploded diagram of a dual-frequency dual-polarization omnidirectional antenna provided in an embodiment of the present invention;

[0026] Figure 2 An assembly diagram of a dual-frequency dual-polarization omnidirectional antenna provided by an embodiment of the present invention;

[0027] Figure 3 A front view of a dual-frequency dual-polarization omnidirectional antenna provided by an embodiment of the present invention;

[0028] Figure 4 A side view of a dual-frequency dual-polarization omnidirectional antenna provided by an embodiment of the present invention;

[0029] Figure 5 A top view of a dual-frequency dual-polarization omnidirectional antenna provided in an embodiment of the present invention;

[0030] Figure 6 A structural diagram of a first antenna radiating unit of a dual-frequency dual-polarization omnidirectional antenna provided in an embodiment of the present invention;

[0031] Figure 7 A structural diagram of a second antenna radiation unit of a dual-frequency dual-polarization omnidirectional antenna provided in an embodiment of the present invention;

[0032] Figure 8 This is a measured diagram of S parameters of a dual-frequency dual-polarization omnidirectional antenna provided in an embodiment of the present invention.

[0033] Description of reference numerals:

[0034] 1: first antenna substrate; 11: first through slot; 2: first antenna radiation unit; 21: first feeding layer; 22: first antenna arm; 221: first long branch; 222: first short branch; 23: first outer conductor connection point; 24: first inner conductor connection point; 3: second antenna substrate; 31: second through slot; 4: second antenna radiation unit; 41: second feeding layer; 42: second antenna arm; 421: second long branch; 422: second short branch; 43: second outer conductor connection point; 44: second inner conductor connection point. DETAILED DESCRIPTION

[0035] The following is a further detailed description of a dual-frequency dual-polarization omnidirectional antenna proposed by the present invention in conjunction with the accompanying drawings and specific embodiments. The advantages and features of the present invention will become more apparent from the following description and claims.

[0036] See also Figures 1 to 7 As shown, the present invention provides a dual-frequency dual-polarization omnidirectional antenna, including a first antenna substrate 1, a first antenna radiating unit 2, a second antenna substrate 3 and a second antenna radiating unit 4:

[0037] The first antenna substrate 1 serves as a carrier of the first antenna radiation unit 2, and a first through slot 11 with an upper end opening is provided at the center right position of the upper end of the first antenna substrate 1; the second antenna substrate 3 serves as a carrier of the second antenna radiation unit 4, and a second through slot 31 with a lower end opening is provided at the center left position of the lower end of the second antenna substrate 3. In this embodiment, the thickness, length and height of the first antenna substrate 1 are the same as those of the second antenna substrate 3;

[0038] See also Figure 7 As shown, the first antenna radiation unit 2 is attached to the surface of the first antenna substrate 1, and the first antenna radiation unit 2 includes a first feed layer 21 and four first antenna arms 22 extending outward from both ends of the first feed layer 21. The four first antenna arms 22 include two first long branches 221 for transmitting 2.4G signals and two first short branches 222 for transmitting 5G signals. The first long branch 221 is used to achieve radiation in the low frequency band of 2400-2500MHz, and the first short branch 222 is used to achieve high frequency band radiation. For radiation of 5150-5850 MHz, a first long branch 221 and a first short branch 222 are symmetrically distributed at both ends of the first feed layer 21, and the first long branch 221 and the first short branch 222 connected to one end of the first feed layer 21 form an "F" shape as a whole. The first feed layer 21 realizes the feeding matching of the low-frequency radiation and the high-frequency radiation of the first antenna radiation unit 2. The first long branch 221, the first short branch 222 and the first feed layer 21 are closely connected, and work together to generate dual-frequency radiation;

[0039] In this embodiment, the first antenna radiation unit 2 further includes a first outer conductor connection point 23 and a first inner conductor connection point 24. The first inner conductor connection point 24 is externally connected to the inner conductor of the coaxial line, and the inner conductor of the externally connected coaxial line is welded to the first inner conductor connection point 24. The first outer conductor connection point 23 is externally connected to the outer conductor of the coaxial line, and the outer conductor of the externally connected coaxial line is welded at the first outer conductor connection point 23.

[0040] The second antenna radiation unit 4 is attached to the surface of the second antenna substrate 3. The second antenna radiation unit 4 includes a second feed layer 41 and four second antenna arms 42 extending outward from both ends of the second feed layer 41. The four second antenna arms 42 include two second long branches 421 for transmitting 2.4G signals and two second short branches 422 for transmitting 5G signals. The second long branches 421 are used to achieve radiation in the low frequency band of 2400-2500MHz, and the second short branches 422 are used to achieve high frequency band radiation. 5150~5850MHz radiation, a second long branch 421 and a second short branch 422 are distributed at both ends of the second feeding layer 41, and the second long branch 421 and the second short branch 422 connected to one end of the second feeding layer 41 form an "F" shape as a whole, and the second feeding layer 41 realizes the feeding matching of the low-frequency radiation and the high-frequency radiation of the second antenna radiation unit 4, and the second long branch 421, the second short branch 422 and the second feeding layer 41 are closely connected, and work together to generate dual-frequency radiation;

[0041] In this embodiment, the second antenna radiation unit 4 further includes a second outer conductor connection point 43 and a second inner conductor connection point 44, the second inner conductor connection point 44 is externally connected to the inner conductor of the coaxial line, the inner conductor of the externally connected coaxial line is welded to the second inner conductor connection point 44, the second outer conductor connection point 43 is externally connected to the outer conductor of the coaxial line, the outer conductor of the externally connected coaxial line is welded at the second outer conductor connection point 43;

[0042] See also Figure 2 As shown, the second antenna substrate 3 is vertically inserted into the first through groove 11 through the second through groove 31 to cross and vertically connect with the first antenna substrate 1. In this embodiment, during actual assembly, the second through groove 31 needs to be vertically inserted into the bottom of the first through groove 11. The sum of the depth of the first through groove 11 and the depth of the second through groove 31 is equal to the height of the first antenna substrate 1. The first antenna radiation unit 2 generates -45° polarized radiation, and the second antenna radiation unit 4 generates +45° polarized radiation, thereby realizing the dual-polarized radiation performance of the antenna.

[0043] As a preferred example of this embodiment, see Figure 6 and Figure 7As shown, the end of the first long branch 221 is designed to be bent, and the first short branch 222 is located on the inner side of the first long branch 221; the end of the second long branch 421 is designed to be bent, and the second short branch 422 is located on the inner side of the second long branch 421. The first long branch 221 and the second long branch 421 both act on the radiation in the 2400-2500MHz frequency band. Because the lower the radiation frequency band, the longer the radiation arm length, the first long branch 221 and the second long branch 421 are bent, thereby greatly reducing the extension area of ​​the antenna, reducing the overall size of the antenna, realizing the miniaturization of the antenna, and reducing the cost of the antenna. The antenna occupies a small volume and has a simple structure. It can conform well to the indoor distributed environment and coexist with other indoor distributed antennas, and has a high application value.

[0044] As a preferred example of this embodiment, see Figure 6 and Figure 7 As shown, the first long branch 221 is located above the first short branch 222; the second long branch 421 is located below the second short branch 422. Considering that the polarization interference in the same frequency band is too large, the low-frequency radiation unit and the high-frequency radiation unit of the two antennas of the ±45° dual-polarization antenna are reversed up and down, so as to maximize the distance between the radiation units in the same frequency band. That is, after the first antenna substrate 1 and the second antenna substrate 3 are cross-assembled vertically, the first long branch 221 of the first antenna radiation unit 2 for achieving low-frequency radiation is farthest from the second long branch 421 of the second antenna radiation unit 4 for achieving low-frequency radiation, and the second short branch 222 of the first antenna radiation unit 2 for achieving high-frequency radiation is farthest from the second short branch 422 of the second antenna radiation unit 4 for achieving high-frequency radiation, which directly improves the isolation in the same frequency band, improves the polarization purity and polarization efficiency of the antenna, achieves high-isolation communication quality, and truly realizes 5G performance with high speed, large capacity and low latency.

[0045] See also Figure 8 As shown, by testing the omnidirectional antenna, in the WIFI dual-band range of 2400-2500MHz and 5150-5850MHz, the return loss of the two ports of the dual-frequency dual-polarization omnidirectional antenna provided in this embodiment is less than -10dB, and the isolation is less than -25dB, with good performance.

[0046] As a preferred example of this embodiment, see Figure 1 As shown, the lower right corner of the first antenna substrate 1 is designed to be chamfered, and the lower left corner of the second antenna substrate 3 is designed to be chamfered, so as to prevent antenna assembly errors, play a fool-proof role, and facilitate the application and installation of the antenna.

[0047] Preferably, the operating frequency bands covered by the dual-frequency dual-polarization omnidirectional antenna provided in this embodiment include 2400-2500 MHz and 5150-5850 MHz.

[0048] The embodiments of the present invention are described in detail above in conjunction with the accompanying drawings, but the present invention is not limited to the above embodiments. Even if various changes are made to the present invention, if these changes fall within the scope of the claims of the present invention and their equivalents, they still fall within the protection scope of the present invention.

Claims

1. A dual-frequency dual-polarization omnidirectional antenna, characterized in that: It includes a first antenna substrate, a first antenna radiation unit, a second antenna substrate and a second antenna radiation unit: The first antenna radiation unit is attached to the surface of the first antenna substrate, and the first antenna radiation unit includes a first feed layer and four first antenna arms extending outward from two ends of the first feed layer, the four first antenna arms include two first long branches for transmitting 2.4G signals and two first short branches for transmitting 5G signals, one first long branch and one first short branch are symmetrically distributed at two ends of the first feed layer, one end of the first feed layer is connected to the first long branch and the first short branch to form an "F" shape as a whole, and the first feed layer, the first long branch and the first short branch work together to generate dual-frequency radiation; The second antenna radiation unit is attached to the surface of the second antenna substrate, the second antenna radiation unit includes a second feed layer and four second antenna arms extending outward from two ends of the second feed layer, the four second antenna arms include two second long branches for transmitting 2.4G signals and two second short branches for transmitting 5G signals, one second long branch and one second short branch are respectively distributed at two ends of the second feed layer, the second long branch and the second short branch connected to one end of the second feed layer form an "F" shape as a whole, and the second feed layer, the second long branch and the second short branch work together to generate dual-frequency radiation; A first through slot with an upper end opening is provided at the center and right position of the upper end of the first antenna substrate, and a second through slot with an lower end opening is provided at the center and left position of the lower end of the second antenna substrate. The second antenna substrate is vertically inserted into the first through slot through the second through slot and is vertically connected to the first antenna substrate by crossing. The first antenna radiating unit generates -45° polarized radiation, and the second antenna radiating unit generates +45° polarized radiation. The end of the first long branch is designed to be curved, and the first short branch is located inside the first long branch; The end of the second long branch is designed to be curved, and the second short branch is located inside the second long branch; Wherein, the first long branch node is located above the first short branch node; The second long branch node is located below the second short branch node.

2. The dual-frequency dual-polarization omnidirectional antenna according to claim 1, characterized in that: The lower right corner of the first antenna substrate is designed to be chamfered, and the lower left corner of the second antenna substrate is designed to be chamfered.

3. The dual-frequency dual-polarization omnidirectional antenna according to claim 1, characterized in that: The first antenna radiation unit further includes a first outer conductor connection point and a first inner conductor connection point, the first inner conductor connection point is externally connected to the inner conductor of the coaxial line, and the first outer conductor connection point is externally connected to the outer conductor of the coaxial line.

4. The dual-frequency dual-polarization omnidirectional antenna according to claim 1, characterized in that: The second antenna radiation unit also includes a second outer conductor connection point and a second inner conductor connection point, the second inner conductor connection point is externally connected to the inner conductor of the coaxial line, and the second outer conductor connection point is externally connected to the outer conductor of the coaxial line.

5. The dual-frequency dual-polarization omnidirectional antenna according to claim 1, characterized in that: The operating frequency bands covered by the dual-frequency dual-polarization omnidirectional antenna include 2400-2500 MHz and 5150-5850 MHz.

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