Low frequency radiating elements and antennas

Abstract

The application provides a low-frequency radiation unit and an antenna, and the technical scheme is as follows: the low-frequency radiation unit comprises two pairs of vertically polarized radiation arms, the radiation arms comprise impedance matching sections and filter sections, the filter sections comprise at least one pair of bend sections which are symmetrical about the extension direction of the radiation arms, a wave-transparent opening is formed between each pair of the bend sections, the impedance matching sections and the filter sections are alternately distributed, and the two ends of the bend sections are respectively electrically connected with two impedance matching sections; the filter sections are used for making the phases of the local high-frequency coupling currents flowing through the two bend sections opposite, so as to offset the parasitic radiation of the high-frequency coupling currents. By arranging the filter sections on the radiation arms, when the high-frequency coupling currents flow through the two bend sections, the phases of the high-frequency coupling currents are opposite, and the parasitic radiation is offset, so that the interference on the high-frequency radiation unit is reduced, and the high-frequency radiation pattern is improved.

Description

Technical Field

[0001] This invention relates to the field of mobile communication technology, and in particular to a low-frequency radiating element and antenna. Background Technology

[0002] Miniaturization design of multi-band shared antennas has become a research hotspot in the mobile communication base station antenna industry. How to design antennas of different frequency bands with the same aperture within a smaller cross-sectional size without sacrificing the performance of each frequency band has become an urgent problem to be solved.

[0003] Currently, mainstream multi-frequency shared antennas need to support the integration of multiple frequency bands such as 690-960MHz / 1690-2690MHz / 3300-3800MHz. When the antenna is miniaturized, the electromagnetic environment becomes more complex, and the mutual coupling between different frequency bands is severe. The blocking of high-frequency radiation elements by low-frequency radiation elements causes distortion of the high-frequency radiation pattern. Summary of the Invention

[0004] The primary objective of this invention is to provide a low-frequency radiating unit that can reduce interference to high-frequency radiating units.

[0005] Another object of the present invention is to provide an antenna employing the aforementioned low-frequency radiating element.

[0006] To achieve the above objectives, the present invention provides the following technical solution:

[0007] A low-frequency radiating element includes two pairs of vertically polarized radiating arms. Each radiating arm includes an impedance matching section for impedance matching and a filtering section for reducing interference to a high-frequency radiating element. Each filtering section includes at least one pair of symmetrically bent portions about the extension direction of the radiating arm. A wave-transmitting port is formed between each pair of bent portions. The impedance matching section and the filtering section are alternately distributed in the extension direction of the radiating arm, and both ends of the bent portions are electrically connected to the two impedance matching sections respectively. The filtering section is used to make the phases of the local high-frequency coupling currents flowing through the two bent portions opposite, thereby canceling the parasitic radiation of the high-frequency coupling currents.

[0008] Further configuration: The bending section includes two first conductive segments perpendicular to the extension direction of the radiating arm and a second conductive segment connected between the two first conductive segments. The two ends of the two bending sections are connected to each other, and the wave-transmitting port forms a closed U-shaped structure.

[0009] Further configuration: The length of the first conductive segment is greater than the length of the second conductive segment.

[0010] Further configuration: Each of the radiating arms is provided with multiple bending sections, and the length of the first conductive segment on the bending section gradually increases as the position of the bending section gradually moves away from the center of the low-frequency radiating unit.

[0011] Further configuration: At least two pairs of bending portions are provided between two adjacent impedance matching segments on the same radiating arm, arranged along the extension direction of the radiating arm.

[0012] Further configuration: the bending extension is arc-shaped or zigzag-shaped, and the corresponding wave-transmitting port is circular or rhomboid in shape.

[0013] Further configuration: The radiating arm is a metal strip on the PCB board, and a pair of the bent portions are located on the upper and lower sides of the PCB board and are coupled to each other.

[0014] Further configuration: The impedance matching section has a hollow structure.

[0015] The present invention also provides an antenna comprising a first radiating element array, a second radiating element array, and a third radiating element array of different frequency bands. The first radiating element array includes the aforementioned low-frequency radiating element, the second radiating element array includes a first high-frequency radiating element, and the third radiating element array includes a second high-frequency radiating element. The second and third radiating element arrays are respectively disposed on both sides of the first radiating element array, and the first and second high-frequency radiating elements are disposed near the radiating arm end position of the low-frequency radiating element.

[0016] Further configuration: the frequency of the first high-frequency radiation unit is higher than the frequency of the second high-frequency radiation unit, and the length of the bent portion of the radiation arm of the low-frequency radiation unit on the side closer to the first high-frequency radiation unit is less than the length of the bent portion on the radiation arm on the side closer to the second high-frequency radiation unit.

[0017] Compared with the prior art, the solution of the present invention has the following advantages:

[0018] 1. In the low-frequency radiation unit of the present invention, by setting a filter section on the radiation arm, the filter section is formed by symmetrically arranged bending sections. When the high-frequency coupling current flows through the bending section, since the two bending sections are symmetrical, the phase of the high-frequency coupling current is opposite, and the parasitic radiation cancels each other out, thereby reducing the interference to the high-frequency radiation unit. In addition, the wave-transmitting aperture formed between the bending sections also reduces the obstruction of the high-frequency radiation unit signal, thereby reducing the interference to the high-frequency radiation unit and improving the high-frequency radiation pattern.

[0019] 2. In the antenna of the present invention, by employing the aforementioned low-frequency radiating element, the low-frequency radiating element reduces interference to the first high-frequency radiating element and the second high-frequency radiating element, improves the high-frequency radiation pattern, and the length of the bending extension on different radiating arms of the low-frequency radiating element matches the frequency of different high-frequency radiating elements, thereby achieving a better decoupling effect and further improving the radiation performance of the antenna.

[0020] Additional aspects and advantages of the invention will be set forth in part in the description which follows, and will become apparent from the description or may be learned by practice of the invention. Attached Figure Description

[0021] The above and / or additional aspects and advantages of the present invention will become apparent and readily understood from the following description of the embodiments taken in conjunction with the accompanying drawings, wherein:

[0022] Figure 1 This is a schematic diagram of the structure of a low-frequency radiation unit in one embodiment of the present invention;

[0023] Figure 2 This is a schematic diagram of the structure of the radiating arm in one embodiment of the present invention;

[0024] Figure 3 This is a schematic diagram of the structure of the radiating arm in another embodiment of the present invention;

[0025] Figure 4 This is a schematic diagram of the structure of the radiating arm in another embodiment of the present invention;

[0026] Figure 5 This is a schematic diagram of the structure of the radiating arm in another embodiment of the present invention;

[0027] Figure 6 This is a schematic diagram of the antenna structure in one embodiment of the present invention;

[0028] Figure 7 This is a schematic diagram of the low-frequency radiation unit in another embodiment of the present invention. Detailed Implementation

[0029] Embodiments of the present invention are described in detail below. Examples of these embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present invention, and should not be construed as limiting the present invention.

[0030] like Figure 1 As shown, this invention provides a low-frequency radiating unit 1, including two pairs of vertically polarized radiating arms 11 and a feed balun (not shown) for supporting and feeding the radiating arms 11. Each radiating arm 11 includes an impedance matching section 111 for impedance matching and a filter section 112 for reducing interference to the high-frequency radiating unit. Multiple segments of each of the impedance matching section 111 and the filter section 112 are provided, and the impedance matching section 111 and the filter section 112 are alternately distributed along the extension direction of the radiating arm. In this embodiment, the radiating arm 11 is a metal strip on a PCB board (not shown).

[0031] Specifically, the filter section 112 includes at least one pair of bent portions 1121 symmetrically distributed about the extension direction of the radiating arm 11. A wave-transmitting port 1122 is formed between each pair of bent portions 1121, and the two ends of the bent portions 1121 are electrically connected to two impedance matching sections 111 respectively. The filter section 112 is used to make the phases of the local high-frequency coupling currents flowing through the two bent portions 1121 opposite, thereby canceling the parasitic radiation of the high-frequency coupling currents.

[0032] A filter section 112 is formed by symmetrically arranged pairs of bends 1121. When the high-frequency coupling current flows through the two bends 1121, its current direction is opposite, making the phase of the high-frequency coupling current on the two bends 1121 opposite. The parasitic radiation generated by the high-frequency coupling current cancels each other out, reducing interference to the high-frequency radiated signal. In addition, a wave-transmitting aperture 1122 is formed between the bends 1121, which reduces interference to the high-frequency radiated signal, thereby improving the high-frequency radiation pattern and enhancing the antenna's radiation performance.

[0033] In this embodiment, the bending portion 1121 includes two first conductive segments 11211 perpendicular to the extending direction of the radiating arm 11 and a second conductive segment 11212 connected between the two first conductive segments 11211. In this embodiment, the second conductive segment 11212 is parallel to the extending direction of the radiating arm 11, and the two first conductive segments 11211 and the second conductive segment 11212 together form a U-shaped structure. In this embodiment, the two ends of the two bending portions 1121 are connected to each other, and the wave-transmitting port 1122 forms a closed U-shaped structure. In other embodiments, the second conductive segment 11212 may not be parallel to the extending direction of the radiating arm 11, and the two first conductive segments 11211 may not be parallel, that is, the bending portion 1121 is not a U-shaped symmetrical structure, but a U-shaped asymmetrical structure.

[0034] Specifically, since the two bending sections 1121 of the filter section 112 are symmetrical to each other, and the two first conductive segments 11211 on the bending section 1121 are also symmetrical to the two first conductive segments 11211 of the other bending section 1121, when the high-frequency coupling current flows through the first conductive segments 11211 of the two bending sections 1121 respectively, the current direction is opposite and the current phase is opposite, thereby reducing the interference to high-frequency radiation signals.

[0035] In this embodiment, since the high-frequency coupling current flows in the same direction through the second conductive segments 11212 on the two bending portions 1121, it is preferable that the length of the first conductive segment 11211 is greater than the length of the second conductive segment 11212. To further reduce the interference of the low-frequency radiation unit 1 on the high-frequency radiation unit, the length of the second conductive segment 11212 can be appropriately reduced, and the length of the first conductive segment 11211 can be extended. The length of the first conductive segment 11211 can be designed and adjusted according to actual needs.

[0036] In this embodiment, each of the radiating arms 11 is provided with multiple bending portions 1121, and each bending portion 1121 has the same structure and the same length. Figure 2 As shown, in one embodiment, the lengths of the various bends 1121 on the radiating arm 11 are different, i.e., the sizes of the wave-transmitting ports 1122 are different. The length of the first conductive segment 11211 on the bend 1121 gradually increases as the position of the bend 1121 moves further away from the center of the low-frequency radiating unit 1. Since the high-frequency radiating unit is usually located at the end of the radiating arm 11 near the low-frequency radiating unit 1, changing the length of the first conductive segment 11211 of each bend 1121 can better reduce interference with the high-frequency radiated signal and weaken the impact on the high-frequency radiated characteristics.

[0037] In this embodiment, the connection between the impedance matching section 111 and the filter section 112 is a necked structure. The necked structure increases the bending length of the bend 1121, extending the length through which the current flows. In another embodiment, combined with... Figure 3 As shown, the necking structure may not be provided at the connection between the impedance matching section 111 and the filter section 112, and the bending extension 1121 may be formed by bending and extending the impedance matching section 111 to the side.

[0038] In this embodiment, each filter segment 112 includes a pair of symmetrically arranged bending extensions 1121. In other embodiments, the filter segment 112 may further include at least two pairs of symmetrically arranged bending extensions 1121 arranged along the extending direction of the radiating arm 11. Figure 4 As shown, in one embodiment, the filter segment 112 includes two pairs of symmetrically arranged bending portions 1121. That is, at least two pairs of bending portions arranged along the extension direction of the radiation arm 11 are provided between two adjacent impedance matching segments 111 on the same radiation arm. The two pairs of bending portions 1121 of each filter segment 112 form a necking structure. By using a structure in which multiple pairs of bending portions 1121 are connected, the requirement to reduce interference to the high-frequency radiation unit can be met, the length of the bending portions 1121 can meet the requirements, and the outward extension length of the first conductive segment 11211 can be avoided to be too long, thereby reducing the PCB area and reducing production costs.

[0039] Furthermore, in other embodiments, the bending portion 1121 may also be arc-shaped or zigzag-shaped, correspondingly making the filter port circular or rhomboid in shape. By changing the shape of the bending portion 1121, the structure of the wave-transmitting port 1122 can be changed, reducing interference with high-frequency radiation signals.

[0040] Furthermore, combined Figure 5 As shown, the impedance matching section 111 can be a hollow structure. By setting the impedance matching section 111 as a hollow structure, the obstruction of the high-frequency radiation unit is greatly reduced, and the high-frequency radiation pattern is improved.

[0041] In this embodiment, the filter segment 112 and the impedance matching segment 111 on the radiating arm 11 are directly connected. In other embodiments, the filter segment 112 and the impedance matching segment 111 may also be interdigitated coupling structure or vertical coupling structure to achieve electrical connection.

[0042] In this embodiment, the two bending portions 1121 of the filter section 112 are directly electrically connected. In other embodiments, the two bending portions 1121 can be disposed on the upper and lower sides of the PCB board and coupled to each other, or they can be formed into a non-closed structure by interdigital coupling structure.

[0043] In this embodiment, the radiating arm 11 is a cross dipole structure. In other embodiments, the radiating arm 11 may also be a rectangular dipole structure, a folded dipole structure, or a positive and negative 45-degree cross dipole structure.

[0044] The present invention also provides an antenna, combined with Figure 6 As shown, the array includes a first radiation unit array, a second radiation unit array, and a third radiation unit array with different frequency bands. The first radiation unit array includes the aforementioned low-frequency radiation unit 1, the second radiation unit array includes a first high-frequency radiation unit 2, and the third radiation unit array includes a second high-frequency radiation unit 3. The second and third radiation unit arrays are respectively disposed on both sides of the first radiation unit array, and the first high-frequency radiation unit 2 and the second high-frequency radiation unit 3 are disposed near the end of the radiation arm 11 of the low-frequency radiation unit 1.

[0045] Combination Figure 7 As shown, further, the frequency of the first high-frequency radiation unit 2 is higher than the frequency of the second high-frequency radiation unit 3, and the length of the bending portion 1121 of the radiation arm 11 on the side of the low-frequency radiation unit 1 closest to the first high-frequency radiation unit 2 is less than the length of the bending portion 1121 on the radiation arm 11 on the side of the second high-frequency radiation unit 3.

[0046] By adjusting the size of the filter segment 112 on the radiating arm 11 of the low-frequency radiating element 1, the requirements for reducing interference of high-frequency radiating elements in different frequency bands can be better met, thereby improving the radiation performance of the antenna.

[0047] In summary, the solution of the present invention has the following advantages:

[0048] 1. In the low-frequency radiation unit 1 of the present invention, by setting a filter section 112 on the radiation arm 11, the filter section 112 is formed by symmetrically arranged bending portions 1121. When the high-frequency coupling current flows through the bending portions 1121, since the two bending portions 1121 are symmetrical, the phase of the high-frequency coupling current is opposite, and the parasitic radiation cancels each other out, thereby reducing the interference to the high-frequency radiation unit and improving the high-frequency radiation pattern.

[0049] 2. In the antenna of the present invention, by employing the low-frequency radiation element 1 described above, the low-frequency radiation element 1 reduces the interference to the first high-frequency radiation element 2 and the second high-frequency radiation element 3, improves the high-frequency radiation pattern, and the length of the bending extension 1121 on different radiation arms 11 of the low-frequency radiation element 1 matches the frequency of different high-frequency radiation elements, thereby achieving a better decoupling effect and further improving the radiation performance of the antenna.

[0050] The above description is only a partial 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 low-frequency radiating unit, characterized in that: The device includes two pairs of vertically polarized radiating arms. Each radiating arm includes an impedance matching section for impedance matching and a filter section for reducing interference to the high-frequency radiating element. The filter section includes at least one pair of symmetrically bent portions about the extension direction of the radiating arm. A wave-transmitting aperture is formed between each pair of bent portions. The impedance matching section and the filter section are alternately distributed in the extension direction of the radiating arm, and the two ends of the bent portions are electrically connected to the two impedance matching sections respectively. The filter section is used to make the phase of the local high-frequency coupling current flowing through the two bent portions opposite, thereby canceling the parasitic radiation of the high-frequency coupling current. Each bent portion includes two first conductive sections perpendicular to the extension direction of the radiating arm and a second conductive section connected between the two first conductive sections. The two ends of the two bent portions are connected to each other, and the wave-transmitting aperture forms a closed U-shaped structure. At least two pairs of bent portions arranged along the extension direction of the radiating arm are provided between two adjacent impedance matching sections on the same radiating arm. The length of the first conductive section is greater than the length of the second conductive section. Each radiating arm has multiple bent portions. The length of the first conductive section on the bent portion gradually increases as the position of the bent portion gradually moves away from the center of the low-frequency radiating element.

2. The low-frequency radiation unit according to claim 1, characterized in that: The bending section is arc-shaped or zigzag-shaped, which corresponds to making the wave-transmitting port round or diamond-shaped.

3. The low-frequency radiation unit according to claim 1, characterized in that: The radiating arm is a metal strip on the PCB board, and a pair of the bent portions are located on the upper and lower sides of the PCB board and their ends are coupled to each other.

4. The low-frequency radiation unit according to claim 1, characterized in that: The impedance matching section has a hollow structure.

5. An antenna comprising a first radiating element array, a second radiating element array, and a third radiating element array in different frequency bands, characterized in that: The first radiation unit array includes a low-frequency radiation unit as described in any one of claims 1 to 4, the second radiation unit array includes a first high-frequency radiation unit, and the third radiation unit array includes a second high-frequency radiation unit. The second radiation unit array and the third radiation unit array are respectively disposed on both sides of the first radiation unit array, and the first high-frequency radiation unit and the second high-frequency radiation unit are disposed at the end of the radiation arm near the low-frequency radiation unit.

6. The antenna according to claim 5, characterized in that: The frequency of the first high-frequency radiation unit is higher than that of the second high-frequency radiation unit, and the length of the bent portion of the radiation arm of the low-frequency radiation unit on the side closer to the first high-frequency radiation unit is shorter than the length of the bent portion on the radiation arm on the side closer to the second high-frequency radiation unit.

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