Microstrip line filter radiation oscillator, filter radiation unit and antenna

Abstract

The present invention relates to a microstrip line filtering radiation oscillator, a filtering radiation unit and an antenna. The microstrip line filtering radiation oscillator includes a substrate. On the front surface of the substrate, a plurality of first metal sheets are arranged in parallel and at intervals. On the back surface of the substrate, a plurality of second metal sheets are arranged in parallel and at intervals. The first metal sheets and the second metal sheets are correspondingly staggered and coupled through coupling portions penetrating through the substrate. The microstrip line filtering radiation oscillator of the present invention has the functions of radiating signals and suppressing interference at the same time. The filtering radiation unit includes at least one oscillator as described above, and can be used in combination with high-frequency radiation elements during use to achieve the purpose of simultaneously radiating high-frequency signals and low-frequency signals. The antenna of the present invention includes at least one filtering radiation unit as described above, and can simultaneously transmit low-frequency signals and high-frequency signals, thereby effectively improving the integration degree of the antenna and reducing the volume of the antenna.

Description

Technical Field

[0001] The present invention relates to the field of antennas, specifically a microstrip line filter radiation oscillator, a filter radiation unit and an antenna. Background Art

[0002] With the rapid development of communication, the fifth-generation communication has arrived. Due to the consideration of operating costs, the 4G + 5G mode will become the mainstream trend of communication development. However, when the 4G antenna and the 5G massive MIMO antenna are mixed and arrayed, the unit radiation unit of the 4G antenna will cause serious interference to the radiation unit of the 5G antenna, resulting in beam deformation of the massive MIMO antenna, affecting the coverage range and the isolation degree between systems not meeting the standard.

[0003] To solve the above problems, the commonly adopted technical solution in the prior art is to insert a band-stop filter on the low-frequency radiation unit arm, thereby effectively suppressing the induced current generated by high-frequency electromagnetic waves on the low-frequency radiation unit and greatly weakening the influence of the low-frequency radiation unit on the high-frequency radiation unit. However, generally several independent filtering structures are loaded, and these filtering structures are lumped components, introducing discontinuities on the oscillator arm and affecting the matching of the oscillator, making it difficult to achieve broadband operation and meet the requirements of antenna operation. Summary of the Invention

[0004] To solve the deficiency in the prior art that the broadband is insufficient due to the discontinuity introduced by inserting a filter into the oscillator, the first object of the present invention is to provide a microstrip line filter radiation oscillator.

[0005] To achieve the above first object, the specific solution adopted by the present invention is as follows: The microstrip line filter radiation oscillator includes a substrate. On the front surface of the substrate, a plurality of first metal sheets are arranged in parallel and at intervals, and on the back surface of the substrate, a plurality of second metal sheets are arranged in parallel and at intervals. The first metal sheets and the second metal sheets are correspondingly staggered and coupled through coupling parts penetrating through the substrate.

[0006] As a preferred solution, both the first metal sheet and the second metal sheet include two mutually parallel end edges, and the end edges are parallel to the edge of the substrate. The two end edges are connected by two connecting edges, and at least one of the two connecting edges forms an obtuse angle with the end edge.

[0007] As a preferred solution, in the normal direction of the substrate, the mutually staggered first metal sheet and the second metal sheet have a coincident end edge.

[0008] Based on the above microstrip line filtering radiation oscillator, the second object of the present invention is to provide a filtering radiation unit, which can be used in combination with high-frequency radiation elements during use to achieve the purpose of simultaneously radiating high-frequency signals and low-frequency signals.

[0009] To achieve the above second object, the specific solution adopted by the present invention is: a filtering radiation unit, including at least one oscillator as described above.

[0010] As a preferred solution, the filtering radiation unit includes at least one pair of oscillators, the pair of oscillators is composed of two of the oscillators, and the substrates of the two oscillators are integrally connected.

[0011] As a preferred solution, the connection line between the two substrates is parallel to the connection lines between all the first metal sheets.

[0012] As a preferred solution, the filtering radiation unit includes two pairs of oscillators, and the connection directions of the substrates in the two pairs of oscillators are perpendicular to each other.

[0013] Based on the above filtering radiation unit, the third object of the present invention is to provide an antenna with good performance, small size and high integration.

[0014] To achieve the above third object, the specific solution adopted by the present invention is: an antenna, including at least one filtering radiation unit as described above.

[0015] As a preferred solution, a number of high-frequency radiation units are arranged on the periphery of each filtering radiation unit.

[0016] As a preferred solution, four high-frequency radiation units evenly distributed in the circumferential direction are arranged on the periphery of each filtering radiation unit.

[0017] The effects that the above antenna oscillator can achieve are as follows: The present invention uses the metal sheets and coupling parts arranged on the substrate to form a continuous filtering structure. Compared with the existing method of inserting a band-stop filter, a larger bandwidth can be obtained. And it can maximize the suppression of high-frequency current, minimize the interference to low-frequency current, and achieve the effect of forward transmission of low-frequency current and radiation of low-frequency signals while suppressing high-frequency induced current in the reverse direction to avoid interference by high-frequency signals.

[0018] The effects that the above filtering radiation unit can achieve are as follows: This filtering radiation unit can be used in combination with high-frequency radiation elements during use to achieve the purpose of simultaneously radiating high-frequency signals and low-frequency signals by virtue of the characteristics of the composite oscillator to conduct low-frequency current while suppressing high-frequency current interference.

[0019] The effects that the above antenna can achieve are as follows: This antenna can simultaneously transmit low-frequency signals and high-frequency signals, thereby effectively improving the integration of the antenna and reducing the volume of the antenna. Brief Description of the Drawings

[0020] Figure 1 is a schematic structural diagram of the microstrip line filter radiation oscillator of the present invention;

[0021] Figure 2 is a side view of the first metal sheet, the coupling portion and the third metal sheet;

[0022] Figure 3 Schematic structural diagram of the filter radiation unit of the present invention;

[0023] Figure 4 is an equivalent circuit diagram of the microstrip line filter radiation oscillator;

[0024] Figure 5 is a schematic diagram of adjusting various parameters;

[0025] Figure 6 is a simulation result diagram of the antenna;

[0026] Figure 7 is a schematic diagram of each parameter of the radiation oscillator of the present invention.

[0027] Brief Description of the Drawings: 1 - Substrate, 2 - First metal sheet, 3 - Coupling portion, 4 - Second metal sheet. Detailed Embodiment

[0028] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts shall fall within the protection scope of the present invention.

[0029] Please refer to Figure 1 , the microstrip line filter radiation oscillator includes a substrate 1. A plurality of first metal sheets 2 that are parallel to each other and spaced apart are provided on the front surface of the substrate 1. A plurality of second metal sheets 4 that are parallel to each other and spaced apart are provided on the back surface of the substrate 1. The first metal sheets 2 and the second metal sheets 4 are correspondingly staggered and coupled through a coupling portion 3 penetrating through the substrate 1.

[0030] The first metal sheet 2, the coupling portion 3 and the second metal sheet 4 can be equivalent to an LC parallel resonance circuit, where the coupling portion 3 is equivalent to C, and the first metal sheet 2 and the second metal sheet 4 are equivalent to L, as Figure 4 shown. And the following conditions are satisfied:

[0031]

[0032] where j is an imaginary number, C1 and C2 are equivalent capacitance values, L1 is an equivalent resistance value, fh is the high-frequency current frequency, f l is the low-frequency current frequency.

[0033] At the resonance frequency point, for the external electric field, the radiation oscillator circuit is in an open state and the impedance tends to infinity. At this time, the external electric field will not generate an induced current. When the frequency is much lower than the resonance frequency, the hollow tube body with spiral slots will be in a state of low inductive reactance and high capacitive reactance, and has only a small impact on low-frequency radiation and impedance matching.

[0034] Furthermore, both the first metal sheet 2 and the second metal sheet 4 include two mutually parallel end edges, and the end edges are parallel to the edge of the substrate 1. The two end edges are connected by two connecting edges, and the angle between at least one of the two connecting edges and the end edge is an obtuse angle. Specifically, the substrate 1 is a rectangular plate, the end edges are parallel to the long side of the substrate 1, and the first metal sheet 2 and the second metal sheet 4 can be in the shape of a parallelogram or a right trapezoid. When in the shape of a parallelogram, both connecting edges form an obtuse angle with the end edge. When in the shape of a right trapezoid, one of the connecting edges forms an obtuse angle with the end edge, and the other connecting edge forms a right angle with the end edge. It should be noted that the parallelogram or the right trapezoid can be used in combination, but the first metal sheet 2 or the second metal sheet 4 in the shape of a right trapezoid needs to be arranged at the end, so as to conduct the coupling current with the grounding part of the feeding mechanism of the radiation oscillator and increase the coupling degree.

[0035] Furthermore, in the normal direction of the substrate 1, the mutually staggered first metal sheet 2 and second metal sheet 4 have a coincident end edge.

[0036] Under the condition of the high-frequency current frequency f h the radiation oscillator behaves as an open circuit. Under the condition of the low-frequency current frequency f lUnder the condition of , the radiation oscillator behaves as a short circuit. On this basis, define the distance between the two end edges of the radiation oscillator as d, the thickness of the substrate 1 as h, the distances between the two first metal sheets 2 and between the two second metal sheets 4 are both g, and the sum of the lengths of the end edges of the first metal sheet 2 and the second metal sheet 4 arranged as a parallelogram and g is w. By adjusting w, g, and d, the suppression of high-frequency current can be maximized, the interference to low-frequency current can be minimized, and the effect of forward transmission of low-frequency current and radiation of low-frequency signals while reversely suppressing high-frequency induced current can be achieved. And because the widths of the first metal sheet 2 and the second metal sheet 4 arranged as a parallelogram are fixed, and the coupling part 3 is connected between the overlapping parts of the first metal sheet 2 and the second metal sheet 4, the width of the coupling part 3 is equal to that of the first metal sheet 2 and the second metal sheet 4. Therefore, the radiation oscillator is uniformly continuous in the effective action area, thus ensuring that the radiation oscillator can obtain sufficient bandwidth. Further, the relationship between the various parameters is: g is proportional to C1. When g increases, the resonant frequency point of the equivalent circuit rises, as Figure 5 shown. In the figure, the abscissa is the frequency, the ordinate is the induced current intensity on the surface of the radiation oscillator, and the black line represents the magnitude of the induced current on the surface of the circular tube without spiral slots. It can be seen from the figure that when g changes by 0.5 mm, the resonant frequency point changes by about 0.2 GHz; as d increases, L1 and C1 will increase, and then the resonant point moves towards the low-frequency direction; as w increases, L1 decreases, C1 increases slightly, and the resonant point moves towards the high-frequency direction.

[0037] In addition, it should be noted that when adjusting w, g, and d, the overall requirements of the antenna need to be met, or the antenna should be adjusted adaptively to ensure smooth installation.

[0038] In this embodiment, the substrate 1 is set as a PCB board, the first metal sheet 2 and the second metal sheet 4 are both printed on the surface of the substrate 1, and the coupling part 3 can be processed by the processing technology of metallized vias.

[0039] Please refer to Figure 3 , based on the above radiation oscillator, the present invention further provides a filtering radiation unit, including at least one of the above radiation oscillators. By virtue of the characteristic that the radiation oscillator itself can radiate low-frequency signals and will not interfere with nearby high-frequency signals, this filtering radiation unit can be used in combination with a high-frequency radiation unit to achieve the purpose of simultaneously radiating high-frequency signals and low-frequency signals without mutual interference.

[0040] Further, the filtering radiation unit includes at least one pair of oscillators. The pair of oscillators consists of two oscillators, and the substrates 1 of the two oscillators are integrally connected.

[0041] The substrates 1 of the two radiation oscillators are integrally connected, that is, the two radiation oscillators are actually located on the same substrate 1, thus simplifying the production process and reducing the production cost.

[0042] Furthermore, the connection line between the two substrates 1 is parallel to the connection lines between all the first metal sheets 2. At this time, one oscillator pair is used to radiate low-frequency signals in one polarization direction.

[0043] Furthermore, the filtering radiation unit includes two oscillator pairs, and the connection directions of the substrates 1 in the two oscillator pairs are perpendicular to each other. The two oscillator pairs are respectively used to radiate low-frequency signals in two polarization directions, and the low-frequency signals in the two polarization directions are in an orthogonal state, that is, the dual-polarization radiation function is realized.

[0044] Based on the above filtering radiation unit, the present invention further provides an antenna, including at least one filtering radiation unit as above.

[0045] Furthermore, several high-frequency radiation units are arranged on the periphery of each filtering radiation unit.

[0046] The high-frequency radiation units are used to radiate high-frequency signals. Because the filtering radiation unit can suppress high-frequency currents while conducting low-frequency currents to radiate low-frequency signals, avoiding interference of high-frequency signals by low-frequency signals, such a combination can transmit low-frequency signals and high-frequency signals simultaneously, thereby effectively improving the integration degree of the antenna and reducing the volume of the antenna. For example, using the filtering radiation unit to transmit low-frequency 4G signals and using the high-frequency radiation unit 3 to transmit high-frequency 5G signals.

[0047] Furthermore, four high-frequency radiation units evenly distributed in the circumferential direction are arranged on the periphery of each filtering radiation unit.

[0048] All the filtering radiation units are arrayed to form a low-frequency antenna, and all the high-frequency radiation units are arrayed to form a high-frequency antenna. For example, the low-frequency antenna can be applied as an FDD antenna, and the high-frequency antenna can be applied as a TDD antenna, thereby effectively weakening the influence of the FDD antenna on the beam of the TDD antenna, meeting the beam coverage index of the TDD antenna, and simultaneously greatly improving the port isolation index to realize the FDD+TDD antenna. Figure 6 This is the simulation result diagram of the antenna. The leftmost column is the high-frequency 2D electric field when there is no low-frequency oscillator, the middle column is the high-frequency 2D electric field when there is a common low-frequency oscillator, and the rightmost column is the high-frequency 2D electric field after replacing the common low-frequency oscillator with a filtering radiation unit. It can be seen that after adopting the microstrip line filtering radiation oscillator, the radiation pattern of the antenna is greatly improved, which can meet the antenna beam coverage index and at the same time improve the port isolation.

[0049] The foregoing description of the disclosed embodiments enables those skilled in the art to make or use the present invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the present invention. Thus, the present invention is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. Microstrip line filter radiation oscillator, characterized by: The invention comprises a substrate (1), wherein a plurality of first metal sheets (2) arranged in parallel and spaced apart are provided on the front side of the substrate (1), and a plurality of second metal sheets (4) arranged in parallel and spaced apart are provided on the back side of the substrate (1), wherein the first metal sheets (2) and the second metal sheets (4) are staggered and coupled via a coupling portion (3) provided on the substrate (1), and the first metal sheet (2), the coupling portion (3) and the second metal sheet (4) are equivalent to an LC parallel resonant circuit, wherein the coupling portion (3) is equivalent to C, the first metal sheet (2) and the second metal sheet (4) are equivalent to L, and at a high-frequency current frequency f h Under the condition of , the radiating oscillator behaves as an open circuit, and at the low frequency current frequency f l Under the condition of , the radiating oscillator behaves as a short circuit.

2. The microstrip line filter radiation oscillator according to claim 1, characterized in that: The first metal sheet (2) and the second metal sheet (4) each include two mutually parallel end edges, and the end edges are parallel to the edge of the substrate (1). The two end edges are connected by two connecting edges, and the angle between at least one of the two connecting edges and the end edge is an obtuse angle.

3. The microstrip line filter radiation oscillator according to claim 2, characterized in that: In the normal direction of the substrate (1), the first metal sheet (2) and the second metal sheet (4) that are staggered with each other have an overlapping end edge.

4. A filtering radiation unit, characterized in that: The device comprises at least one vibrator according to claim 1.

5. The filtering radiation unit according to claim 4, wherein: The filtering radiation unit comprises at least one vibrator pair, the vibrator pair is composed of two vibrators, and the substrates (1) of the two vibrators are integrally connected.

6. The filtering radiation unit according to claim 5, wherein: The filtering radiation unit comprises two pairs of oscillators, and the connection directions of the substrates (1) in the two pairs of oscillators are perpendicular to each other.

7. Antenna, characterized in that: The invention comprises at least one filtering radiation unit according to claim 6, wherein a plurality of high-frequency radiation units are arranged on the periphery of each filtering radiation unit.

8. The antenna according to claim 7, wherein: Four high-frequency radiation units are evenly distributed along the circumferential direction and are arranged on the circumferential side of each filtering radiation unit.

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