Low-frequency filtering radiation unit and antenna array

Abstract

The invention relates to the technical field of low-frequency filtering oscillator units, in particular to a low-frequency filtering radiation unit which comprises a fixed support, a single-balun integrated feed piece, a PCB radiation plate and a PCB radiation surface microstrip line embedded in the surface of the PCB radiation plate and electrically connected with the single-balun integrated feed piece. The single Balun integrated feed sheet is used for feeding the PCB radiating surface microstrip line; the PCB radiating surface microstrip line comprises a plurality of folded dipoles, and each folded dipole comprises two filtering dipole arms and a high-frequency choking coil microstrip connected in series with the two filtering dipole arms; on one hand, the single-balun integrated feed sheet is used for feeding, the assembly design is simplified, and the cost is reduced, on the other hand, the folded dipole is connected in series with the high-frequency choking coil microstrip through the two filtering dipole arms, the low-frequency gain is improved, and meanwhile, the influence on the gain due to the horizontal plane wave width deformation of the high-frequency dipole in the antenna array can be avoided; and mutual coupling and mutual influence between low-frequency oscillators and high-frequency oscillators in the antenna array layout can be effectively suppressed.

Description

Technical Field

[0001] This invention relates to the field of low-frequency filter oscillator unit technology, specifically to a low-frequency filter radiating unit and antenna array. Background Technology

[0002] With the rapid development of wireless communication technology, antennas play an increasingly important role in communication systems. Existing antenna technologies mainly focus on parameters such as antenna gain, bandwidth, and polarization; however, a single antenna design often cannot simultaneously meet these requirements. Therefore, an antenna design that can simultaneously provide ultra-wideband, high-gain, dual-polarization, multi-port, and multi-band characteristics is needed. Existing PCB half-wave arrays cannot meet the market's high-gain requirements, while die-cast arrays not only fail to meet the market's requirements for multi-frequency antennas but also struggle to satisfy the demands for antenna miniaturization and lightweighting, resulting in extremely high processing costs. Quasi-full-wave filter radiating elements have unique features in antenna structure design. Through specific length and shape designs, they achieve more efficient electromagnetic radiation and reception. Compared to traditional antenna structures, quasi-full-wave filter radiating elements can operate over a wider frequency range and have better frequency response characteristics.

[0003] Existing high- and low-frequency nested solutions mainly use a low-frequency bowl-shaped vibrator combined with a high-frequency die-cast half-wave vibrator. The presence of the high-frequency vibrator inside the bowl-shaped vibrator causes horizontal beamwidth distortion, affecting gain and the S-parameters of the high-frequency vibrator. Furthermore, existing low-frequency PCB half-wave vibrators have relatively low gain, making them prone to mutual coupling and interference with mid- and high-frequency vibrators in antenna arrays. Additionally, the use of dual baluns increases overall assembly complexity, impacting production efficiency. Summary of the Invention

[0004] In order to overcome the shortcomings and deficiencies of the existing technology, one of the objectives of this invention is to provide a low-frequency filtering radiation unit that improves unit isolation and high gain.

[0005] The second objective of this invention is to provide an antenna array that employs the low-frequency filtering radiation unit of this invention, which can avoid the horizontal plane waveform distortion of the high-frequency vibrator from affecting the gain, and effectively suppress the mutual coupling and mutual influence between the low-frequency vibrator and the mid-to-high-frequency vibrator in the antenna array layout.

[0006] The objective of this invention is achieved through the following technical solution: a low-frequency filtering radiation unit, comprising a fixed bracket, a single balun integrated feed chip housed within the fixed bracket, a PCB radiation board fixedly connected to the top of the fixed bracket, and a PCB radiation surface microstrip line embedded on the surface of the PCB radiation board and electrically connected to the single balun integrated feed chip, wherein the single balun integrated feed chip is used to feed the PCB radiation surface microstrip line; the PCB radiation surface microstrip line includes multiple folded oscillators, each folded oscillator including two filter oscillator arms and a high-frequency choke coil microstrip connecting the two filter oscillator arms in series.

[0007] Preferably, the filter oscillator arm includes a first microstrip section, a first capacitor filter section, an oscillator radiating microstrip, a second capacitor filter section, and a slot filter section connected in sequence, with the end of the high-frequency choke microstrip connected to the slot filter section.

[0008] Preferably, both the middle portion of the first capacitor filter section and the middle portion of the second capacitor filter section have U-shaped bends.

[0009] Preferably, the slit filter section has a U-shaped aperture in the middle.

[0010] Preferably, the PCB radiating board has a socket in the middle for inserting a single balun integrated power feed chip, and the top two sides of the single balun integrated power feed chip have limiting ridges that abut against the top surface of the PCB radiating board.

[0011] Preferably, the number of folded oscillators is four, and the four folded oscillators are orthogonally distributed in pairs.

[0012] Preferably, one side of the single balun integrated feed sheet integrates a feed sheet -45° microstrip line and a feed sheet +45° microstrip line. The top ends of both the feed sheet -45° microstrip line and the feed sheet +45° microstrip line extend to form a oscillator arm welding point for welding to a folded oscillator. The bottom ends of both the feed sheet -45° microstrip line and the feed sheet +45° microstrip line have cable network welding points. The other opposing folded oscillator extends to form a feed sheet welding point for welding to the other side of the single balun integrated feed sheet.

[0013] Preferably, one side of the bottom of the fixing bracket is connected to a cable clamp with an opening facing downward for clamping the cable.

[0014] Preferably, the fixed bracket has a slot in the middle for inserting a single balun integrated power supply piece, a limiting arm extends from one side of the top of the slot, a positioning post extends from the top side of the limiting arm, and the single balun integrated power supply piece has a positioning hole that cooperates with the positioning post.

[0015] An antenna array includes a reflector and at least one low-frequency filtering radiation element as described above, which is fixedly connected to the reflector.

[0016] The beneficial effects of this invention are as follows: The low-frequency filtering radiation unit of this invention employs a fixed bracket, a single balun integrated feed piece housed within the fixed bracket, a PCB radiating board fixedly connected to the top of the fixed bracket, and a PCB radiating surface microstrip line embedded on the surface of the PCB radiating board and electrically connected to the single balun integrated feed piece. The single balun integrated feed piece is used to feed the PCB radiating surface microstrip line. The PCB radiating surface microstrip line includes multiple folded elements, each folded element including two filter element arms and a high-frequency choke coil microstrip connecting the two filter element arms in series. On the one hand, using a single balun integrated feed piece for feeding simplifies assembly design and reduces costs. On the other hand, the folded element, with two filter element arms connected in series with the high-frequency choke coil microstrip, improves the gain of the low frequency itself. At the same time, it can also avoid the horizontal plane waveform distortion of the high-frequency element affecting the gain in the antenna array, effectively suppressing the mutual coupling and mutual influence between the low-frequency element and the mid-to-high-frequency element in the antenna array layout. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of the structure of the low-frequency filtering radiation unit described in this invention; Figure 2 This is an exploded schematic diagram of the low-frequency filtering radiation unit described in this invention; Figure 3 This is an exploded schematic diagram from another perspective of the low-frequency filtering radiation unit described in this invention; Figure 4 This is a top view of the low-frequency filtering radiation unit described in this invention; Figure 5 yes Figure 4 Cross-sectional view of AA.

[0018] The attached figures are labeled as follows: 1. Fixed bracket; 2. Single balun integrated feed plate; 3. PCB radiating board; 4. PCB radiating surface microstrip line; 41. Folded oscillator; 411. Filter oscillator arm; 4111. First microstrip support; 4112. First capacitor filter support; 4113. Oscillator radiating microstrip; 4114. Second capacitor filter support; 4115. Gap filter support; 412. High-frequency choke microstrip; 5. U-shaped bend; 6. U-shaped aperture; 7. Insert; 8. Limiting ridge; 9. Feed plate -45° microstrip line; 10. Feed plate +45° microstrip line; 11. Oscillator arm welding point; 12. Cable network welding point; 13. Feed plate welding point; 14. Wire clamp; 15. Slot; 16. Limiting pressure arm; 17. Positioning post; 18. Positioning hole. Detailed Implementation

[0019] To facilitate understanding by those skilled in the art, the present invention will be further described below with reference to embodiments and accompanying drawings. The content mentioned in the embodiments is not intended to limit the present invention.

[0020] like Figure 1-5 As shown, a low-frequency filtering radiation unit includes a fixed bracket 1, a single balun integrated feed chip 2 housed within the fixed bracket 1, a PCB radiating board 3 fixedly connected to the top of the fixed bracket 1, and a PCB radiating surface microstrip line 4 embedded on the surface of the PCB radiating board 3 and electrically connected to the single balun integrated feed chip 2. The single balun integrated feed chip 2 is used to feed the PCB radiating surface microstrip line 4. The PCB radiating surface microstrip line 4 includes multiple folded oscillators 41. Each folded oscillator 41 includes two filter oscillator arms 411 and a high-frequency choke coil microstrip 412 connecting the two filter oscillator arms 411 in series.

[0021] This low-frequency filtering and radiating unit comprises a fixed bracket 1, a single balun integrated feed plate 2 housed within the fixed bracket 1, a PCB radiating board 3 fixedly connected to the top of the fixed bracket 1, and a PCB radiating surface microstrip line 4 embedded on the surface of the PCB radiating board 3 and electrically connected to the single balun integrated feed plate 2. The single balun integrated feed plate 2 is used to feed the PCB radiating surface microstrip line 4. The PCB radiating surface microstrip line 4 includes multiple folded oscillators 41, each folded oscillator 41 including two filter oscillator arms 411 and two filter oscillators connected in series. The high-frequency choke microstrip 412 of the sub-arm 411; on the one hand, it is fed by the single balun integrated feed chip 2, which simplifies the assembly design and reduces the cost; on the other hand, the folded vibrator 41 is connected in series with the high-frequency choke microstrip 412 by two filter vibrator arms 411 to obtain excellent high-frequency impedance characteristics, improve the gain of the low frequency itself, suppress non-target frequency band signals, and at the same time, it can also avoid the horizontal plane waveform distortion of the high-frequency vibrator in the antenna array, which affects the gain, and effectively suppress the mutual coupling and mutual influence between the low-frequency vibrator and the mid-to-high frequency vibrator in the antenna array layout.

[0022] Furthermore, the filter oscillator arm 411 includes a first microstrip section 4111, a first capacitor filter section 4112, an oscillator radiating microstrip 4113, a second capacitor filter section 4114, and a slot filter section 4115 connected in sequence. The end of the high-frequency choke microstrip 412 is connected to the slot filter section 4115. The first capacitor filter section 4112, the second capacitor filter section 4114, and the slot filter section 4115 work together to reduce coupling and mutual interference between different frequency bands during arraying.

[0023] Furthermore, both the middle portion of the first capacitor filter section 4112 and the middle portion of the second capacitor filter section 4114 have U-shaped bends 5.

[0024] Furthermore, a U-shaped aperture 6 is provided in the middle of the slot filter section 4115. The U-shaped bend 5 complements the band-stop characteristics of high-frequency signals and the radiation null point of the U-shaped aperture 6, jointly constructing a wideband isolation barrier to reduce coupling and mutual interference between different frequency bands during arraying.

[0025] Furthermore, the PCB radiating board 3 has a socket 7 in the middle for inserting the single balun integrated power supply piece 2, and the top two sides of the single balun integrated power supply piece 2 have limiting ridges 8 that abut against the top surface of the PCB radiating board 3. The single balun integrated power supply piece 2 is inserted into the socket 7 of the PCB radiating board 3, and is limited by the limiting ridges 8 to abut against the top surface of the PCB radiating board 3, which facilitates quick installation.

[0026] Furthermore, the number of folded oscillators 41 is four, and the four folded oscillators 41 are orthogonally distributed in pairs.

[0027] Furthermore, one side of the single balun integrated feed sheet 2 integrates a feed sheet -45° microstrip line 9 and a feed sheet +45° microstrip line. The top ends of the feed sheet -45° microstrip line 9 and the feed sheet +45° microstrip line both extend to form a vibrator arm welding point 11 for welding to a folded vibrator 41. The bottom ends of the feed sheet -45° microstrip line 9 and the feed sheet +45° microstrip line both have cable network welding points 12. The other opposing folded vibrator 41 extends to form a feed sheet welding point 13 for welding to the other side of the single balun integrated feed sheet 2.

[0028] Furthermore, a cable clamp 14 with an opening facing downwards is connected to one side of the bottom of the fixing bracket 1 for clamping the cable. This allows the cable to be clamped by the cable clamp 14 after the cable network is connected to the cable network welding point 12 of the low-frequency filter radiation unit, preventing loosening from affecting the electrical connection between the cable network and the single balun integrated feed plate 2.

[0029] Furthermore, the fixed bracket 1 has a slot 15 in the middle for inserting the single balun integrated power supply piece 2. A limiting arm 16 extends from one side of the top of the slot 15, and a positioning post 17 extends from the top side of the limiting arm 16. The single balun integrated power supply piece 2 has a positioning hole 18 that engages with the positioning post 17. After the single balun integrated power supply piece 2 is inserted into the slot 15 along the insertion port 7, the positioning post 17 extends into the positioning hole 18 for positioning, preventing the single balun integrated power supply piece 2 from detaching from the fixed bracket 1 and improving the connection stability between the fixed bracket 1 and the single balun integrated power supply piece 2.

[0030] The low-frequency filtering radiating unit constructed by the above scheme of this invention is a broadband PCB single-balun full-wave unit supporting the 690-960MHz frequency band. In this embodiment, the PCB radiating board 3 and the PCB radiating surface microstrip line 4 are designed with single-sided copper-clad FRA4 board for printing single-sided microstrip lines (the radiating surface full-wave microstrip is an unconventional double-sided coupled microstrip design). The original double-sided copper-clad microstrip coupling form of the radiating surface is changed to a single-sided embedded coupling design, which can also effectively improve unit isolation and high gain, and can also ensure PIM index requirements, which is conducive to the miniaturization of the antenna.

[0031] An antenna array includes a reflector and at least one low-frequency filtering radiation element as described above, which is fixedly connected to the reflector. This antenna array, employing the reflector and the low-frequency filtering radiation element of this invention, avoids horizontal plane waveform distortion of the high-frequency vibrator that affects gain, effectively suppresses the intercoupling and mutual influence between low-frequency and mid-to-high-frequency vibrators in the antenna array layout, avoids uneven signal coverage, and improves spectrum utilization efficiency.

[0032] The above embodiments are preferred implementations of the present invention. In addition, the present invention can be implemented in other ways. Any obvious substitutions without departing from the concept of the present invention are within the protection scope of the present invention.

Claims

1. A low-frequency filtering radiation unit, characterized in that: The device includes a fixed bracket (1), a single balun integrated feed plate (2) housed in the fixed bracket (1), a PCB radiating board (3) fixedly connected to the top of the fixed bracket (1), and a PCB radiating surface microstrip line (4) embedded on the surface of the PCB radiating board (3) and electrically connected to the single balun integrated feed plate (2). The single balun integrated feed plate (2) is used to feed the PCB radiating surface microstrip line (4). The PCB radiating surface microstrip line (4) includes multiple folded oscillators (41), each folded oscillator (41) including two filter oscillator arms (411) and a high-frequency choke microstrip (412) connecting the two filter oscillator arms (411) in series.

2. The low-frequency filtering radiation unit according to claim 1, characterized in that: The filter oscillator arm (411) includes a first microstrip section (4111), a first capacitor filter section (4112), an oscillator radiating microstrip (4113), a second capacitor filter section (4114), and a slot filter section (4115) connected in sequence. The end of the high-frequency choke microstrip (412) is connected to the slot filter section (4115).

3. A low-frequency filtering radiation unit according to claim 2, characterized in that: Both the middle part of the first capacitor filter section (4112) and the middle part of the second capacitor filter section (4114) have U-shaped bends (5).

4. A low-frequency filtering radiation unit according to claim 2, characterized in that: The slit filter section (4115) has a U-shaped hole (6) in the middle.

5. A low-frequency filtering radiation unit according to claim 1, characterized in that: The PCB radiating board (3) has a socket (7) in the middle for inserting a single balun integrated power feed piece (2), and the top two sides of the single balun integrated power feed piece (2) have limiting ridges (8) that abut against the top surface of the PCB radiating board (3).

6. A low-frequency filtering radiation unit according to claim 1, characterized in that: The number of the folded oscillators (41) is four, and the four folded oscillators (41) are orthogonally distributed in pairs.

7. A low-frequency filtering radiation unit according to claim 6, characterized in that: One side of the single balun integrated feed sheet (2) is integrated with a feed sheet -45° microstrip line (9) and a feed sheet +45° microstrip line. The top end of the feed sheet -45° microstrip line (9) and the top end of the feed sheet +45° microstrip line both extend to a oscillator arm welding point (11) for welding with a folded oscillator (41). The bottom end of the feed sheet -45° microstrip line (9) and the bottom end of the feed sheet +45° microstrip line both have a cable network welding point (12). The other opposite folded oscillator (41) extends to a feed sheet welding point (13) for welding with the other side of the single balun integrated feed sheet (2).

8. A low-frequency filtering radiation unit according to claim 6, characterized in that: The bottom side of the fixed bracket (1) is connected to a cable clamp (14) with an opening facing downwards for clamping the cable.

9. A low-frequency filtering radiation unit according to claim 1, characterized in that: The fixed bracket (1) has a slot (15) in the middle for inserting the single balun integrated power supply plate (2). A limiting arm (16) extends from one side of the top of the slot (15). A positioning post (17) extends from the top side of the limiting arm (16). The single balun integrated power supply plate (2) has a positioning hole (18) that is positioned and engaged with the positioning post (17).

10. An antenna array, characterized in that: It includes a reflector and at least one low-frequency filtering radiation unit as described in any one of claims 1-9, which is fixedly connected to the reflector.

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