Antenna element with filtering function, filtering radiation unit and antenna

Abstract

The present invention relates to an antenna oscillator with filtering function, a filtering radiation unit and an antenna. The antenna oscillator with filtering function is tubular, and there are spiral slots arranged circumferentially around it and extending axially on the tubular antenna oscillator; the filtering radiation unit includes a support column, and at least one antenna oscillator as described above is electrically connected to the upper part of the support column; the antenna includes a reflector, and at least one filtering radiation unit as described above is fixedly arranged on the reflector; the antenna oscillator with filtering function provided by the present invention has the functions of radiating signals and suppressing interference at the same time; the filtering radiation unit of the present invention can be used in combination with high-frequency radiation elements during use to achieve the purpose of radiating high-frequency signals and low-frequency signals simultaneously; the antenna of the present invention has good performance, small volume and high integration degree.

Description

Technical Field

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

[0002] With the rapid development of communication, the fifth-generation communication has arrived. Due to the consideration of operation cost, the 4G + 5G mode will become the mainstream trend of communication development. However, when the 4G antennas and 5G massive MIMO antennas are mixedly arrayed, the unit radiation units of the 4G antennas will cause serious interference to the radiation units of the 5G antennas, resulting in beam deformation of the massive MIMO antennas, 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. These filtering structures are lumped components, introducing discontinuity 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] The first object of the present invention is to overcome the problem of insufficient bandwidth caused by the introduction of discontinuity in the existing inserted band-stop filter, and provide an antenna oscillator with filtering function.

[0005] To achieve the above first object, the specific solution adopted by the present invention is: an antenna oscillator with filtering function, the antenna oscillator is tubular, and there are spiral slots arranged circumferentially around it and extending axially.

[0006] As a preferred solution, the antenna oscillator is circular tubular.

[0007] Based on the above antenna oscillator with filtering function, 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.

[0008] To achieve the above second object, the specific solution adopted by the present invention is: a filtering radiation unit, including a support column, and at least one of the above-mentioned antenna oscillators is electrically connected to the upper part of the support column.

[0009] As a preferred solution, at least one pair of oscillators is electrically connected to the upper part of the support column, and the pair of oscillators is composed of two coaxially arranged antenna oscillators.

[0010] As a preferred solution, two of the oscillator pairs are electrically connected to the upper part of the support column, and the axes of the two oscillator pairs are perpendicular to each other.

[0011] 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.

[0012] To achieve the above third object, the specific solution adopted by the present invention is: an antenna, including a reflector, and at least one of the above-mentioned filtering radiation units is fixedly arranged on the reflector.

[0013] As a preferred solution, a plurality of high-frequency radiation units are arranged on the periphery of each of the filtering radiation units, and the high-frequency radiation units are fixedly arranged on the reflector.

[0014] As a preferred solution, at least one oscillator pair is electrically connected to the upper part of the support column, the oscillator pair is composed of two antenna oscillators arranged coaxially, and one of the high-frequency radiation units is arranged below the side of each antenna oscillator.

[0015] As a preferred solution, two of the oscillator pairs are electrically connected to the upper part of the support column, the axes of the two oscillator pairs are perpendicular to each other, and four of the high-frequency radiation units are arranged on the periphery of each of the filtering radiation units, and the four high-frequency radiation units are evenly distributed.

[0016] The effects that the above antenna oscillator can achieve are: in the present invention, a continuous filtering structure is formed in the spiral slot on the oscillator. 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 reversely suppressing high-frequency induced current to avoid being interfered by high-frequency signals at the same time.

[0017] The effects that the above filtering radiation unit can achieve are: by virtue of the characteristic that the antenna oscillator conducts low-frequency current while suppressing high-frequency current interference, 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.

[0018] The effects that the above antenna can achieve are: 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. Description of the Drawings

[0019] Figure 1 is a schematic structural diagram of an antenna oscillator;

[0020] Figure 2 is a schematic structural diagram of a filtering radiation unit;

[0021] Figure 3It is a schematic structural diagram of an antenna;

[0022] Figure 4 It is an equivalent circuit diagram of an antenna element;

[0023] Figure 5 It is a schematic diagram of adjusting various parameters;

[0024] Figure 6 It is a simulation result diagram of the antenna.

[0025] Description of the drawings: 1 - slot, 2 - support column, 3 - high-frequency radiation unit, 4 - reflector. Detailed implementation manners

[0026] 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.

[0027] Please refer to Figure 1 , an antenna element with a filtering function, the antenna element is tubular, and a spiral slot 1 is provided around the circumference of the tubular antenna element and extends axially.

[0028] Each hollow tube body containing one turn of spiral slot can be equivalent to an LC parallel resonance circuit, as Figure 4 shown.

[0029] And it satisfies the following conditions:

[0030]

[0031] where j is an imaginary number, C1 and C2 are equivalent capacitance values, L1 is an equivalent resistance value, f h is the high-frequency current frequency, f l is the low-frequency current frequency.

[0032] At the resonance frequency point, for the external electric field, the antenna element 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 a spiral slot will be in a state of low inductive reactance and high capacitive reactance, and has only a small impact on the low-frequency radiation and impedance matching.

[0033] Under the condition of the high-frequency current frequency f h , the antenna element shows an open circuit, and at the low-frequency current frequency f lUnder the condition of , the antenna element behaves as a short circuit. On this basis, the inner diameter of the antenna element is defined as d, the thickness is h, the width of the slot 1 is g, and the distance between two adjacent spirals of the slot 1 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 suppressing high-frequency induced current in the reverse direction can be achieved. Moreover, since the slot 1 is spiral, w is fixed, that is, on the effective action area of the antenna element where the slot 1 is located, the antenna element is uniformly continuous, thus ensuring that the antenna element 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 shown in Figure 5 As shown, the abscissa in the figure is the frequency, and the ordinate is the induced current intensity on the surface of the antenna element. 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 increase, and then the resonant point moves towards the low-frequency direction; as w increases, L1 decreases and C1 increases slightly, and the resonant point moves towards the high-frequency direction.

[0034] 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 adaptively adjusted to ensure smooth installation.

[0035] Furthermore, the antenna element is in the shape of a circular tube, which can reduce the processing difficulty. In other embodiments of the present invention, the antenna element can be set to other shapes, such as a square tube, and the size can be changed according to the actually required radiation frequency.

[0036] Please refer to Figure 2 , based on the above antenna element, the present invention further provides a filtering radiation unit, including a support column 2, and at least one of the above antenna elements is electrically connected to the upper part of the support column 2.

[0037] The support column 2 is used to support the antenna element on the one hand to control the distance between the antenna element and the reflector 4 of the remaining antennas, so as to meet the requirements of installing other components, and on the other hand, it is also used to feed the antenna element. According to the actual usage requirements, the number of antenna elements can be flexibly selected.

[0038] By virtue of the characteristic that the filtering radiation unit conducts low-frequency current while suppressing high-frequency current interference of the antenna element, it can be used in combination with high-frequency radiation elements when in use to achieve the purpose of simultaneously radiating high-frequency signals and low-frequency signals. For example, the filtering radiation unit can be used to radiate low-frequency 4G signals, and the high-frequency radiation element can be used to radiate high-frequency 5G signals. The induced current formed by the 5G signal on the filtering radiation unit is suppressed, thus avoiding interference of the 4G signal to the 5G signal.

[0039] Further, at least one pair of oscillators is electrically connected to the upper part of the support column 2, and the pair of oscillators consists of two coaxially arranged antenna oscillators.

[0040] One pair of oscillators is used to complete the signal transmission task in one polarization direction, and vertical polarization signals or horizontal polarization signals can be transmitted according to actual requirements. It should be noted that insulation treatment is required between the two antenna oscillators. In actual applications, a certain gap can be left between the two complex oscillators, and then the two antenna oscillators are fed respectively. At this time, the support column 2 can be realized by a balun. By means of the balun, the characteristic of converting unbalanced coaxial feeding into balanced feeding can ensure the symmetry of the radiation pattern of the filtering radiation unit.

[0041] Further, two pairs of oscillators are electrically connected to the upper part of the support column 2, and the axes of the two pairs of oscillators are perpendicular to each other. At this time, the filtering radiation unit can transmit vertical polarization signals and horizontal polarization signals simultaneously, improving the signal transmission efficiency.

[0042] Please refer to Figure 3 , based on the above filtering radiation unit, the present invention also provides an antenna, including a reflector 4, and at least one of the above filtering radiation units is fixedly arranged on the reflector 4.

[0043] Further, several high-frequency radiation units 3 are arranged on the periphery of each filtering radiation unit, and the high-frequency radiation units 3 are fixedly arranged on the reflector 4.

[0044] The high-frequency radiation unit 3 is used to radiate high-frequency signals. Since 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 of the antenna and reducing the volume of the antenna. For example, the filtering radiation unit is used to transmit low-frequency 4G signals, and the high-frequency radiation unit 3 is used to transmit high-frequency 5G signals.

[0045] Further, at least one pair of oscillators is electrically connected to the upper part of the support column 2, the pair of oscillators consists of two coaxially arranged antenna oscillators, and a high-frequency radiation unit 3 is arranged below the side of each antenna oscillator.

[0046] Further, two pairs of oscillators are electrically connected to the upper part of the support column 2, the axes of the two pairs of oscillators are perpendicular to each other, and four high-frequency radiation units 3 are arranged on the periphery of each filtering radiation unit, and the four high-frequency radiation units 3 are evenly distributed.

[0047] All the filtering radiation element arrays form a low-frequency antenna, and all the high-frequency radiation elements are arrayed in 3 groups 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, so as to effectively reduce the influence of the FDD antenna on the beam of the TDD antenna, meet the beam coverage index of the TDD antenna, and at the same time greatly improve the port isolation index to achieve the FDD+TDD antenna. Figure 6 is the simulation result diagram of the antenna, Figure 6 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 element. It can be seen that after using the antenna 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.

[0048] The above description of the disclosed embodiments enables those skilled in the art to implement or use the present invention. Various modifications to these embodiments will be obvious to those skilled in the art, and the general principles defined herein can be implemented in other embodiments without departing from the spirit or scope of the present invention. Therefore, the present invention will not be limited to the embodiments shown herein, but rather to the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. An antenna element with a filtering function, characterized in that: The antenna vibrator is tubular and has a spiral slot (1) arranged around its circumference and extending along the axial direction. Each hollow tube body containing a circle of spiral slots can be equivalent to an LC parallel resonant circuit. The inner diameter of the antenna vibrator is defined as d, the thickness is h, and the slot is defined as l The width of the gap is g, l The distance between two adjacent spirals is w. By adjusting w, g and d, the suppression of high-frequency current can be maximized and the interference with low-frequency current can be minimized.

2. The antenna element with filtering function according to claim 1, wherein: The antenna element is in a circular tube shape.

3. A filtering radiation unit, characterized in that: The invention comprises a support column (2), the upper part of which is electrically connected to at least one antenna element as described in claim 1, and when used, is matched with a high-frequency radiation element to achieve simultaneous radiation of high-frequency signals and low-frequency signals.

4. The filtering radiation unit according to claim 3, wherein: The upper part of the support column (2) is electrically connected to at least one vibrator pair, and the vibrator pair consists of two coaxially arranged antenna vibrators.

5. The filtering radiation unit according to claim 4, wherein: The upper part of the support column (2) is electrically connected to the two vibrator pairs, and the axes of the two vibrator pairs are perpendicular to each other.

6. Antenna, characterized in that: It comprises a reflecting plate (4), on which at least one filtering radiation unit according to claim 3 is fixedly arranged.

7. The antenna according to claim 6, wherein: A plurality of high-frequency radiation units (3) are arranged on the peripheral side of each filtering radiation unit, and the high-frequency radiation units (3) are fixedly arranged on the reflection plate (4).

8. The antenna according to claim 7, wherein: The upper portion of the support column (2) is electrically connected to at least one vibrator pair, the vibrator pair consisting of two coaxially arranged antenna vibrators, and a high-frequency radiation unit (3) is provided below the side of each antenna vibrator.

9. The antenna according to claim 8, wherein: The upper portion of the support column (2) is electrically connected to two pairs of vibrators, the axes of the two pairs of vibrators being perpendicular to each other, and four high-frequency radiation units (3) are arranged on the circumference of each filtering radiation unit, and the four high-frequency radiation units (3) are evenly distributed.

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