A low frequency radiation unit and antenna

Abstract

The present invention relates to the field of communication technology, and discloses a low-frequency radiation unit and an antenna, wherein the low-frequency radiation unit comprises a bottom plate, a support plate disposed at one end on the bottom plate, and a radiation plate disposed at the other end of the support plate; wherein the radiation plate comprises two dipole arms that cross each other and are disposed perpendicularly to each other, the dipole arms comprise a first radiation arm and a second radiation arm, the first radiation arm is provided with a plurality of spiral groove structures, and the second radiation arm is rotationally symmetrical with the first radiation arm. The present invention provides a low-frequency radiation unit and an antenna, wherein a spiral groove structure is added to the dipole arm to form a band-stop filter circuit, so that the circuit has a high-frequency filtering function, effectively solves the mutual coupling problem between high-frequency and low-frequency radiation units in an antenna array, reduces the interference of low-frequency radiation units on high-frequency radiation units, and is conducive to the multi-frequency and integrated design of the antenna.

Description

Technical Field

[0001] The present invention relates to the field of communication technology, and in particular to a low-frequency radiation unit and an antenna. Background Art

[0002] With the development of mobile communication technology, multi-system shared base station antennas have gradually become mainstream products. Such antennas generally include GSM900 communication system radiation units, which operate in the 880-960MHz frequency band, and also include DCS1800 communication system radiation units, which operate in the 1710-1880MHz frequency band, and may also include WCDMA communication system radiation units, which operate in the 1920-2170MHz frequency band. In general, the three communication systems work simultaneously. Since the higher frequency band is a multiple of the frequency of the lower frequency band, there is a possibility that the frequency of the higher frequency band will resonate on the low-frequency band radiation unit components. This interaction causes the low-frequency band radiation unit to scatter the high-frequency signal, resulting in deformation of the high-frequency band radiation pattern, larger beam width fluctuations, and poor signal coverage of the base station antenna. Summary of the invention

[0003] The purpose of the present invention is to provide a low-frequency radiating unit and an antenna to solve the mutual coupling problem between high- and low-frequency radiating units in an antenna array, reduce the interference of the low-frequency radiating unit on the high-frequency radiating unit, and facilitate the multi-frequency and integrated design of the antenna.

[0004] In order to solve the above technical problems, in a first aspect, an embodiment of the present invention provides a low-frequency radiation unit, wherein the low-frequency radiation unit includes:

[0005] Base plate;

[0006] A support plate having one end disposed on the bottom plate;

[0007] A radiation plate disposed at the other end of the support plate;

[0008] The radiation plate comprises two dipole arms which cross each other vertically, the dipole arms comprise a first radiation arm and a second radiation arm, the first radiation arm is provided with a plurality of spiral groove structures, and the second radiation arm is rotationally symmetrical with the first radiation arm.

[0009] As a preferred solution, the first radiating arm and the second radiating arm are rectangular copper foils.

[0010] As a preferred solution, the spiral groove structure includes a gap and a spiral conductor segment formed by the gap.

[0011] As a preferred solution, the width of the gap is 0.5 mm to 2 mm, and the width of the spiral conductor segment is 0.5 mm to 2 mm.

[0012] As a preferred solution, the support plate includes two base plates, the middle portions of the two base plates are complementary grooved and cross-engaged with each other.

[0013] As a preferred solution, the front surface of the substrate has an L-shaped microstrip line, and the microstrip line includes impedance transformation segments with different lengths and widths.

[0014] In a preferred embodiment, the back side of the substrate has a conductive layer, and the outer side of the conductive layer has an open line segment.

[0015] As a preferred solution, the height of the substrate is one quarter of the wavelength of the low-frequency operating frequency.

[0016] As a preferred solution, the base plate, the support plate and the radiation plate are all PCB board structures.

[0017] In order to solve the above technical problem, in a second aspect, an embodiment of the present invention provides an antenna, comprising:

[0018] Reflective panels;

[0019] A number of high frequency radiating units; and

[0020] A plurality of low-frequency radiation units as described in any one of the first aspects;

[0021] Among them, a plurality of the low-frequency radiation units and a plurality of the high-frequency radiation units are arranged on the reflection plate, and a plurality of the low-frequency radiation units are arranged in the middle of a plurality of the high-frequency radiation units.

[0022] Compared with the prior art, the low-frequency radiation unit and antenna provided by the embodiments of the present invention have the following beneficial effects: a spiral groove structure is added to the dipole arm to form a band-stop filter circuit, so that it has a high-frequency filtering function, effectively solving the mutual coupling problem between the high- and low-frequency radiation units in the antenna array, reducing the interference of the low-frequency radiation unit to the high-frequency radiation unit, and being conducive to the multi-frequency and integrated design of the antenna; and by optimizing the number and size of the spiral groove structures, the bandwidth of the high-frequency stop band can be widened. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] In order to more clearly illustrate the technical features of the embodiments of the present invention, the drawings required for use in the embodiments of the present invention will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without paying any creative work.

[0024] Figure 1 is a schematic diagram of a three-dimensional structure of a low-frequency radiation unit provided by an embodiment of the present invention;

[0025] Figure 2 is a top view of a low-frequency radiation unit provided by an embodiment of the present invention;

[0026] Figure 3 is an enlarged view of a radiation arm provided by an embodiment of the present invention;

[0027] Figure 4 is an equivalent circuit diagram of a radiating arm provided by an embodiment of the present invention;

[0028] Figure 5 is a simulation result of a radiation arm provided by an embodiment of the present invention;

[0029] Figure 6 is a schematic diagram of the front and back surfaces of the first substrate provided by an embodiment of the present invention;

[0030] Figure 7 Schematic diagram of the front and back surfaces of the second substrate provided by the embodiment of the present invention

[0031] Figure 8 It is a plan view of a nested array of antennas provided by an embodiment of the present invention. DETAILED DESCRIPTION

[0032] In order to have a clearer understanding of the technical features, purposes and effects of the present invention, the specific embodiments of the present invention are further described in detail below in conjunction with the accompanying drawings and examples. The following examples are only used to illustrate the present invention, but are not intended to limit the scope of protection of the present invention. Based on the embodiments of the present invention, other embodiments obtained by those skilled in the art without paying creative work should all belong to the scope of protection of the present invention.

[0033] In the description of the present invention, it should be understood that the numbers themselves, such as "first", "second", etc., are only used to distinguish the objects described, have no sequential or technical meaning, and cannot be understood as stipulating or implying the importance of the objects described.

[0034] See also Figure 1 and Figure 2 , a low-frequency radiation unit provided by an embodiment of the present invention includes:

[0035] Bottom plate 10;

[0036] A support plate 20 having one end disposed on the bottom plate 10;

[0037] A radiation plate 30 disposed at the other end of the support plate 20;

[0038] The radiation plate 30 includes a first dipole arm 31 and a second dipole arm 32 which are vertically intersected and arranged perpendicular to each other.

[0039] The first dipole arm 31 includes a first radiation arm 311 and a second radiation arm 31;

[0040] The first radiation arm 311 is provided with a plurality of spiral groove structures 40;

[0041] The second radiation arm 312 is rotationally symmetric to the first radiation arm 311 (180°) (ie, has the same structure);

[0042] The second vibrator arm 32 has the same structure as the first vibrator arm, which is equivalent to being obtained by rotating the first vibrator arm 31 by 90 degrees.

[0043] Specifically, the second dipole arm 32 is equivalent to the first dipole arm 31 rotated 90 degrees, and the two dipole arms are perpendicular to each other and placed crosswise up and down to form a dual-polarized dipole. The first dipole arm 31 is composed of a first radiation arm 311 and a second radiation arm 312 distributed in rotational symmetry, and 1 to 5 spiral groove structures 40 can be set thereon.

[0044] The spiral groove structure 40 forms an LC band-stop filter circuit, and adjusting its shape can make its stop-band resonance frequency be at the high-frequency signal position, thereby specifically filtering out the high-frequency induction signal on the low-frequency band radiation unit.

[0045] A plurality of spiral groove structures 40 may be provided on the first radiation arm 311 and the second radiation arm 312, which is equivalent to a plurality of LC band-stop filter circuits connected in series, and has a better effect of suppressing high-frequency induced current. The number and size of the spiral groove structures 40 on the first radiation arm 311 and the second radiation arm 312 may be optimized to further broaden the bandwidth of the high-frequency stop band.

[0046] A low-frequency radiation unit provided in an embodiment of the present invention adds a spiral groove structure on the dipole arm to form a band-stop filter circuit, so that it has a high-frequency filtering function, effectively solves the mutual coupling problem between the high- and low-frequency radiation units in the antenna array, reduces the interference of the low-frequency radiation unit on the high-frequency radiation unit, and is conducive to the multi-frequency and integrated design of the antenna; and by optimizing the number and size of the spiral groove structure, it can also widen the bandwidth of the high-frequency stop band.

[0047] In a preferred embodiment, the first radiation arm 311 and the second radiation arm 312 are rectangular copper foils.

[0048] The length of the matrix copper foil is about one quarter of the wavelength of the central operating frequency.

[0049] In this embodiment, both the first radiation arm 31 and the second radiation arm 32 are designed to be rectangular using copper foil, which reduces the difficulty of designing the radiation arms.

[0050] In a preferred embodiment, see Figure 3 The spiral groove structure 40 includes a gap 401 and a spiral conductor segment 402 formed by the gap 401 .

[0051] The spiral groove structure 40 is composed of a gap 401 (i.e., a groove) and a spiral conductor segment 402 formed thereby. In the microwave frequency band, the gap 401 is equivalent to a capacitor C, and the spiral conductor segment 402 is equivalent to an inductor L, so that the spiral groove structure 40 forms an LC band-stop filter circuit (when the frequency is very high, the gap between metals will produce a capacitive effect, and the thin metal strip will produce an inductor effect).

[0052] The equivalent circuit diagram of the radiating arm connecting three spiral groove structures 40 in series is as follows: Figure 4 As shown, after simulation, the simulation results are as follows Figure 5 As shown, it can be seen that within the frequency range of 1710-2690MHz, there are three obvious stopband resonance points, which can effectively attenuate high-frequency induction signals.

[0053] In addition, the length, width and shape of the slot 401 are adjusted so that the stopband resonance frequency is at the high-frequency signal position, so that the high-frequency induction signal on the low-frequency band radiation unit can be specifically filtered out. The radiation arm can have multiple spiral groove structures 40, which is equivalent to multiple filter circuits connected in series, and has a better effect of suppressing high-frequency induction current.

[0054] In a preferred embodiment, the width of the gap 401 is 0.5 mm to 2 mm, and the width of the spiral conductor segment 402 is 0.5 mm to 2 mm.

[0055] The values ​​of capacitance and inductance in the equivalent circuit can be changed by changing the width of the slot 401 and the width of the spiral conductor segment 402 , and multiple combinations can achieve the same resonant frequency.

[0056] See also Figure 6 , Figure 7 In a preferred embodiment, the support plate 20 includes a first substrate 21 and a second substrate 22, and the middle portions of the two substrates are complementary grooved and cross-engaged with each other.

[0057] Specifically, the first substrate 21 and the second substrate 22 are in a 90-degree rotational symmetric form and intersect in a cross shape. The two substrates are complementary grooved in the middle and interlock with each other, and the lower ends of the first substrate 21 and the second substrate 22 are fixedly connected to the bottom plate 10. The upper end of the first substrate 21 is welded to the first dipole arm 31 to form a +45-degree polarized radiation unit, and the upper end of the second substrate 22 is welded to the second dipole arm 32 to form a -45-degree polarized radiation unit.

[0058] Preferably, the height of the first substrate 21 and the second substrate 22 is about one quarter of the wavelength of the low-frequency operating frequency, thereby forming a balun structure to provide a balanced-unbalanced conversion function.

[0059] The front sides of the first substrate 21 and the second substrate 22 have L-shaped microstrip lines 51 , and the microstrip lines 51 include impedance transformation segments with different lengths and widths.

[0060] like Figure 6 As shown, the front sides of the first substrate 21 and the second substrate 22 include an L-shaped microstrip line 51. The microstrip line 51 includes impedance transformation segments of different lengths and widths. The signal is fed in through the bottom of the microstrip line 51, and after passing through multiple impedance transformation segments, it is fed to the dipole arm through coupling.

[0061] Furthermore, the back sides of the first substrate 21 and the second substrate 22 have a conductive layer 52 , and the outer sides of the conductive layer have an opening line segment 521 .

[0062] like Figure 7 As shown, the back side of the first substrate 21 and the second substrate 22 is a conductive layer 52, and the outer side of the conductive layer 52 includes an open line segment 521. The length of the open line segment 521 is preferably one quarter of the wavelength of the higher frequency band operating frequency. The open line segment 521 forms a choke structure with the conductive layer 52, which can prevent high-frequency induction signals from flowing on the conductive layer 52, thereby reducing the scattering effect of high-frequency signals.

[0063] In a preferred embodiment, the base plate 10, the support plate 20 and the radiation plate 30 are all PCB board structures.

[0064] In this embodiment, the bottom plate 10, the support plate 20, and the radiation plate 30 all adopt a PCB structure, which has a simple structure and good consistency.

[0065] Accordingly, an embodiment of the present invention further provides an antenna, comprising:

[0066] Reflector 300;

[0067] A plurality of high frequency radiation units 200; and

[0068] A plurality of low-frequency radiation units 100 as described in any of the above embodiments;

[0069] Among them, a plurality of the low-frequency radiation units 100 and a plurality of the high-frequency radiation units 200 are arranged on the reflection plate 300 , and a plurality of the low-frequency radiation units 100 are arranged in the middle of a plurality of the high-frequency radiation units 200 .

[0070] In a preferred embodiment, see Figure 8 The antenna includes a low-frequency radiation unit 100, six high-frequency radiation units 200 and a reflector 300, wherein the low-frequency radiation unit 100 and the high-frequency radiation unit 200 are both arranged on the reflector 300, and the low-frequency radiation unit 100 is arranged in the middle of the six high-frequency radiation units 200. Since the low-frequency radiation unit 100 of the present invention has a strong inhibitory effect on the high-frequency induced current, the nested combination of the low-frequency radiation unit 100 and the high-frequency radiation unit 200 of the present invention can effectively reduce the influence of the low-frequency radiation unit on the performance of the high-frequency radiation unit, thereby realizing the multi-frequency and integration of the antenna.

[0071] It should be noted that the arrangement and number of the low-frequency radiation unit 100 and the high-frequency radiation unit 200 of the antenna of the present invention are not limited to Figure 8 As shown, it can be set arbitrarily according to actual needs.

[0072] The above description is only a preferred embodiment of the present invention, but the protection scope of the present invention is not limited thereto. It should be pointed out that for those skilled in the art, several equivalent obvious variations and / or equivalent substitutions can be made without departing from the technical principles of the present invention. These obvious variations and / or equivalent substitutions should also be regarded as the protection scope of the present invention.

Claims

1. A low-frequency radiation unit, characterized in that: include: Base plate; A support plate having one end disposed on the bottom plate; A radiation plate disposed at the other end of the support plate; The radiation plate comprises two dipole arms which are vertically crossed and arranged perpendicular to each other, the dipole arms comprise a first radiation arm and a second radiation arm, the first radiation arm is provided with a plurality of spiral groove structures, and the second radiation arm is rotationally symmetrical with the first radiation arm; The support plate comprises two base plates, the middle parts of the two base plates are complementary grooved and cross-engaged with each other; The back side of the substrate has a conductive layer, the outer side of the conductive layer has an open line segment, the open line segment and the conductive layer form a choke structure to prevent high-frequency induction signals from flowing on the conductive layer; The first radiation arm and the second radiation arm are rectangular copper foils.

2. The low-frequency radiation unit according to claim 1, characterized in that: The spiral groove structure includes a gap and a spiral conductor segment formed by the gap.

3. The low-frequency radiation unit according to claim 2, characterized in that: The width of the gap is 0.5 mm to 2 mm, and the width of the spiral conductor segment is 0.5 mm to 2 mm.

4. The low-frequency radiation unit according to claim 1, characterized in that: The front side of the substrate is provided with an L-shaped microstrip line, and the microstrip line includes impedance transformation sections with different lengths and widths.

5. The low-frequency radiation unit according to claim 1, characterized in that: The height of the substrate is one quarter of the wavelength of the low-frequency working frequency.

6. The low-frequency radiation unit according to any one of claims 1 to 5, characterized in that: The bottom plate, the support plate and the radiation plate are all PCB board structures.

7. An antenna, characterized in that: include: Reflective panels; A number of high frequency radiating units; and A plurality of low-frequency radiation units as claimed in any one of claims 1 to 6; Among them, a plurality of the low-frequency radiation units and a plurality of the high-frequency radiation units are arranged on the reflection plate, and a plurality of the low-frequency radiation units are arranged in the middle of a plurality of the high-frequency radiation units.

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