Inductive frequency-selective choke radiation element and isolation strip

Abstract

This invention discloses an inductive frequency-selective choke radiating unit and an isolation strip, belonging to the field of antenna radiation. It includes: a reflector; a high-frequency vibrator disposed on the reflector; and a low-frequency vibrator, including a balun plate disposed on the reflector and a radiating arm disposed on the balun plate, the radiating arm being electrically connected to the balun plate. The radiating arm extends outward from the balun plate and forms a radiating surface located on the radiation path of the high-frequency vibrator. The radiating arm includes a choke section that extends spirally along the length of the radiating arm to form an inductive structure. This reduces electromagnetic coupling between the high-frequency and low-frequency vibrators and the resulting electromagnetic interference, replacing the traditional method that requires additional metal baffles, PCB frequency-selective isolation walls, or decoupling networks. The inductive structure formed by the radiating arm itself suppresses the electromagnetic frequency emitted by the high-frequency vibrator, reducing secondary radiation generated by the high-frequency vibrator and simplifying the structure of the radiating unit.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of antenna radiation, in particular to an inductive frequency selective choke radiation unit and isolation strip. BACKGROUND

[0002] In the field of mobile communication and wireless communication, multi-band antennas usually integrate multiple radiation dipoles working at different frequency bands in the same structure to meet the coverage requirements of multi-frequency signals. However, due to the limited space arrangement inside the antenna, electromagnetic coupling inevitably exists between low-frequency dipoles and high-frequency dipoles. When the high-frequency dipole is working, its radiation signal will induce a high-frequency coupling current on the radiation arm of the low-frequency dipole, which excites the low-frequency dipole to produce secondary radiation, thereby changing the electromagnetic field distribution around the antenna and adversely affecting the radiation performance of the low-frequency dipole. Therefore, in the design of the antenna, it is necessary to ensure the normal radiation of the radiation dipoles at different frequency bands while suppressing the electromagnetic coupling between the radiation dipoles at different frequency bands.

[0003] In the prior art, common suppression methods include metal baffles, PCB frequency selective isolation walls, and decoupling networks. However, metal baffles completely block electromagnetic signals, which is not conducive to signal dispersion, and are heavy, which is not conducive to the lightweight of the antenna; PCB frequency selective isolation walls have certain frequency selective isolation ability, but their processing cost is high, and they may still interfere with the normal operation of high-frequency dipoles; decoupling networks require additional electronic components such as capacitors and inductors to be welded, increasing the complexity of the structure and assembly, and the working bandwidth is limited by component selection, making it difficult to meet the wideband requirement. SUMMARY

[0004] The purpose of the present application is to provide an inductive frequency selective choke radiation unit and isolation strip, which aims to solve the problems of the existing suppression methods such as heavy weight, high processing cost, complex structure, and limited bandwidth.

[0005] The present application provides an inductive frequency selective choke radiation unit, comprising: a reflector plate; a high-frequency dipole disposed on the reflector plate; a low-frequency dipole comprising a balun plate disposed on the reflector plate and a radiation arm disposed on the balun plate, the radiation arm being electrically connected to the balun plate; wherein the radiation arm extends outward from the balun plate and forms a radiation surface, the radiation surface being located on the radiation path of the high-frequency dipole, the radiation arm comprising a choke section, the choke section extending in a spiral shape along the length direction of the radiation arm to form an inductive structure.

[0006] Preferably, the choke section is wound in a spiral shape, and the number of turns is at least one turn.

[0007] Preferably, the spiral diameter of the choke section is 6mm-15mm.

[0008] Preferably, the spacing between adjacent turns of the choke section along the length direction of the radiation arm is a pitch, and the pitch is 2mm-10mm.

[0009] Preferably, the radiation arm is made of copper material or aluminum material.

[0010] Preferably, the balun plate is provided with electrical contacts, and the radiation arm is welded on the electrical contacts.

[0011] Preferably, the radiation arm further comprises a folded section, which extends along the length direction of the radiation arm and is arranged in a curved and folded manner.

[0012] Preferably, the reflector plate is made of aluminum material.

[0013] In another aspect, the present application also provides an inductive frequency selective choke isolation strip, which comprises a choke section, and the choke section extends spirally along the length direction of the inductive frequency selective choke isolation strip to form an inductive structure.

[0014] Compared with the prior art, the present application has the following beneficial effects: The present application provides an inductive frequency selective choke radiation unit. By arranging a choke section extending spirally along the length direction of the radiation arm of a low-frequency vibrator, the radiation arm forms an inductive structure. When the radiation frequency emitted by a high-frequency vibrator passes through the radiation arm of the low-frequency vibrator, a high-frequency coupling current is generated. Since the inductive structure has an inductance that increases with the increase of the radiation frequency, the transmission of the high-frequency coupling current is hindered, the degree of transmission of the high-frequency coupling current along the radiation arm and the secondary radiation is reduced, the electromagnetic coupling between the high-frequency vibrator and the low-frequency vibrator and the electromagnetic interference caused thereby are reduced, the traditional method of additionally arranging a metal baffle, a PCB frequency selective isolation wall or a decoupling network is replaced, the inductive structure formed by the radiation arm itself is used to suppress the electromagnetic frequency emitted by the high-frequency vibrator, the secondary radiation of the high-frequency vibrator is reduced, the structure of the radiation unit is simplified, and the miniaturization of the overall size of the radiation unit is facilitated. BRIEF DESCRIPTION OF DRAWINGS

[0015] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings needed in the embodiment description will be briefly introduced. Obviously, the drawings in the following description are only preferred embodiments of the present application, and other drawings can be obtained by those skilled in the art without creative labor.

[0016] Figure 1This is a schematic diagram of the low-frequency oscillator structure of an inductive frequency-selective choke radiation unit according to an embodiment of the present invention; Figure 2 This is a schematic diagram of the radiating arm structure of an inductive frequency-selective choke radiating unit according to an embodiment of the present invention; Figure 3 This is a schematic diagram of the overall structure of an inductive frequency-selective choke radiation unit according to an embodiment of the present invention; Figure 4 This is a schematic diagram of the structure of an inductive frequency-selective choke isolation strip according to an embodiment of the present invention; Figure 5 The S-parameter curve of an inductive frequency-selective choke radiating unit in the 690MHz-960MHz frequency band is shown in an embodiment of the present invention. Figure 6 This is a comparison diagram of the isolation degree of an inductive frequency-selective choke isolation strip according to an embodiment of the present invention; Figure 7 This is a radiation pattern of an inductive frequency-selective choke radiation unit according to an embodiment of the present invention.

[0017] In the diagram, 1 is the reflector; 2 is the high-frequency vibrator; 3 is the low-frequency vibrator; 31 is the balun plate; 32 is the radiating arm; 321 is the choke section; and 322 is the folding section. Detailed Implementation

[0018] To better understand the structure, functional features, and advantages of the present invention, preferred embodiments of the present invention will be described in detail below with reference to the accompanying drawings: like Figure 1 , Figure 2 and Figure 3 As shown, the present invention provides an inductive frequency-selective choke radiating unit, comprising: a reflector 1, a high-frequency vibrator 2, and a low-frequency vibrator 3. The high-frequency vibrator 2 is disposed on the reflector 1. The low-frequency vibrator 3 includes a balun plate 31 disposed on the reflector 1 and a radiating arm 32 disposed on the balun plate 31. The radiating arm 32 is electrically connected to the balun plate 31 and extends outward from the balun plate 31 to form a radiating surface. The radiating surface is located on the radiation path of the high-frequency vibrator 2. The radiating arm 32 includes a choke section 321, which extends spirally along the length of the radiating arm 32 to form an inductive structure.

[0019] It should be noted beforehand that the inductor structure mentioned in this embodiment follows the well-known principle of electromagnetic induction, that is, when the alternating current changes, the inductor generates an induced electromotive force in the opposite direction to the current change, thus exhibiting inductive reactance characteristics. The magnitude of the inductive reactance is given by the formula... Confirmed, among which For inductance, Given the signal frequency, it can be known that the inductance... With the frequency basically fixed, The higher the frequency, the stronger the inductance's resistance to current. The lower the value, the weaker the resistance. The choke section 321 extends spirally along the length of the radiating arm 32 to form an inductive structure because when the current flows along the spiral path, each turn of the coil generates a magnetic field around itself. When the current changes, this magnetic field changes accordingly. According to Faraday's law of electromagnetic induction, the changing magnetic field will induce an electromotive force in the conductor itself that opposes the change of current, thus exhibiting inductive characteristics.

[0020] According to the embodiment of the present invention, when the high-frequency oscillator 2 and the low-frequency oscillator 3 operate simultaneously, the high-frequency oscillator 2 and the low-frequency oscillator 3 respectively receive feed signals of corresponding frequency bands and generate electromagnetic radiation of corresponding frequency bands. The low-frequency electromagnetic signal generated by the low-frequency oscillator 3 is transmitted through the balun plate 31 to the radiating arm 32 electrically connected to it, and is transmitted outward along the radiating arm 32. Since the radiating arm 32 forms a radiating surface, this radiating surface forms the main area for the low-frequency oscillator 3 to radiate the low-frequency electromagnetic signal. Since the high-frequency oscillator 2 and the low-frequency oscillator 3 are integrated on the same reflector plate 1, and the radiating surface is located on the radiation path of the high-frequency oscillator 2, the high-frequency electromagnetic signal generated by the high-frequency oscillator 2 will electromagnetically couple with the radiating arm 32 of the low-frequency oscillator 3, and a high-frequency coupling current corresponding to the high-frequency electromagnetic signal will be formed in the radiating arm 32. When the current propagates along the radiating arm 32, it further excites the radiating arm 32 to generate a high-frequency current distribution, causing the low-frequency oscillator 3 to radiate the high-frequency electromagnetic signal secondaryly. In order to reduce the influence of the high-frequency coupling current on the low-frequency oscillator 3, a choke section 321 is set on the radiating arm 32. When the high-frequency electromagnetic signal emitted by the high-frequency oscillator 2 generates a high-frequency coupling current on the radiating arm 32, the inductive reactance generated by the inductor structure will increase with the increase of the current frequency, making it difficult for the high-frequency coupling current to continue to propagate along the radiating arm 32. This reduces the propagation degree of the high-frequency coupling current on the radiating arm 32 and weakens the excitation effect of the high-frequency coupling current on the radiating arm 32, thereby reducing the possibility of the low-frequency oscillator 3 generating secondary radiation due to receiving the high-frequency electromagnetic signal, and further reducing the electromagnetic coupling between the high-frequency oscillator 2 and the low-frequency oscillator 3 and the resulting electromagnetic interference.

[0021] On the other hand, since the low-frequency electromagnetic signal emitted by the low-frequency oscillator 3 has a low frequency, the inductive structure formed by the choke section 321 on the radiating arm 32 generates a small inductive reactance when receiving the low-frequency electromagnetic signal. Therefore, the low-frequency current can still be transmitted along the radiating arm 32 and form the required radiated current distribution. The choke section 321 utilizes the physical characteristics of the inductive structure to block the high-frequency coupling current generated by the high-frequency electromagnetic signal, while not affecting the normal transmission of the low-frequency electromagnetic signal. This achieves selective choking of high-frequency and low-frequency electromagnetic signals. By integrating the choke section 321 onto the radiating arm 32 of the low-frequency oscillator 3, the traditional method of additionally setting metal baffles, PCB frequency selective isolation walls, or decoupling networks is replaced. The inductive structure formed by the radiating arm 32 itself is used to suppress the electromagnetic frequency emitted by the high-frequency oscillator 2, while simplifying the structure of the radiating unit and facilitating the miniaturization of the overall size of the radiating unit.

[0022] The following detailed description uses specific examples: In some embodiments, the choke section 321 is spirally wound, with at least one turn. The spiral diameter of the choke section 321 is 6mm-15mm. The spacing between adjacent turns of the choke section 321 along the length of the radiating arm 32 is the pitch, which is 2mm-10mm. The radiating arm 32 is made of copper or aluminum.

[0023] The radiating arm 32 forms a continuous, curved spiral conductive path at the choke section 321. Current must travel along this spiral path when passing through the choke section 321, thus increasing the actual conductive path length and creating magnetic field coupling between adjacent spiral sections. This gives the radiating arm 32 inductive characteristics. The spiral diameter determines the radial expansion of the spiral path in the choke section 321. By limiting the spiral diameter, the choke section 321 can maintain appropriate spatial dimensions while forming an inductive structure, avoiding excessive spiral expansion that would increase the space occupied by the radiating unit, and also preventing the spiral structure from being too small to achieve the required inductive characteristics. This allows the choke section 321 to be compatible with the overall structure of the radiating unit. By limiting the pitch, a suitable match can be achieved between the axial length of the choke section 321, the spiral conductive path, and the inductive characteristics, enabling the choke section 321 to form a continuous inductive conductive path within a limited space. Both copper and aluminum materials have good electrical conductivity, which enables the current fed into the low-frequency oscillator 3 to be transmitted along the radiating arm 32 and form the radiating current distribution required by the low-frequency oscillator 3.

[0024] In some embodiments, the balun plate 31 is provided with electrical contacts, and the radiating arm 32 is welded to the electrical contacts. The radiating arm 32 also includes a folded section 322, which extends along the length of the radiating arm 32 and is arranged in a curved and folded configuration. The reflector 1 is made of aluminum.

[0025] The radiating arm 32 is fixed to the electrical contacts of the balun plate 31 by welding, forming a stable electrical connection between the radiating arm 32 and the balun plate 31. When the low-frequency oscillator 3 operates, the low-frequency current is transmitted through the balun plate 31 to the electrical contacts and then through the welding position to the radiating arm 32, causing the radiating arm 32 to form a current distribution corresponding to the low-frequency signal and perform low-frequency electromagnetic radiation. Since the radiating arm 32 itself needs to have a certain length to form a radiation path that meets the operating requirements of the low-frequency oscillator 3, if the radiating arm 32 extends in a straight line in a single direction, it will occupy a large installation space. By setting a bent and folded section 322 on the extension path of the radiating arm 32, the extension direction of the radiating arm 32 in space can be changed, so that the radiating arm 32 can maintain the preset length while compressing the space occupied by the radiating arm 32, making the radiating arm 32 adaptable to the limited installation space within the radiation unit. The reflector 1 serves as the mounting base for the high-frequency vibrator 2 and the low-frequency vibrator 3, providing mounting support for them. It also needs to reflect the electromagnetic signals generated by the high-frequency vibrator 2 and the low-frequency vibrator 3. Aluminum has good electrical conductivity, and the reflector 1 made of aluminum can meet the requirements of electromagnetic signal reflection and conductivity. At the same time, aluminum itself has a relatively low density, which can reduce the weight of the reflector 1 while meeting the structural strength requirements, thereby reducing the weight of the entire radiation unit.

[0026] like Figure 4 As shown, the present invention also provides an inductive frequency-selective choke isolation strip. The inductive frequency-selective choke isolation strip includes a choke section that extends spirally along the length of the strip to form an inductive structure. In this embodiment, the inductive frequency-selective choke isolation strip is an independent structure that extends along a predetermined direction and can be positioned in the radiating unit at the location requiring electromagnetic signal isolation, placing it on the electromagnetic coupling path between the high-frequency and low-frequency oscillators. By utilizing its own inductive structure, it suppresses the electromagnetic coupling between the high-frequency and low-frequency oscillators, achieving selective isolation between them without using an overall blocking method.

[0027] The above are merely preferred embodiments of the present invention and are not intended to limit the present invention in any way. Any person skilled in the art can make many possible variations and modifications to the technical solutions of the present invention, or modify them into equivalent embodiments, without departing from the scope of the present invention. Therefore, any modifications, equivalent changes, and alterations made to the above embodiments based on the technology of the present invention without departing from the scope of the present invention are within the protection scope of the present invention.

Claims

1. An inductive frequency-selective choke radiating unit, characterized in that, include: Reflector (1); A high-frequency oscillator (2) is disposed on the reflector (1); The low-frequency oscillator (3) includes a balun plate (31) disposed on the reflector plate (1) and a radiating arm (32) disposed on the balun plate (31), wherein the radiating arm (32) is electrically connected to the balun plate (31); The radiating arm (32) extends outward from the balun plate (31) and surrounds to form a radiating surface. The radiating surface is located on the radiating path of the high-frequency oscillator (2). The radiating arm (32) includes a choke section (321), which extends spirally along the length of the radiating arm (32) to form an inductor structure.

2. The inductive frequency-selective choke radiating unit according to claim 1, characterized in that, The choke section (321) is spirally wound, and the number of turns is at least one.

3. The inductive frequency-selective choke radiating unit according to claim 2, characterized in that, The spiral diameter of the choke section (321) is 6mm-15mm.

4. An inductive frequency-selective choke radiating unit according to claim 3, characterized in that, The pitch between adjacent turns of the choke section (321) along the length of the radial arm (32) is 2mm-10mm.

5. An inductive frequency-selective choke radiating unit according to claim 1, characterized in that, The radiating arm (32) is made of copper or aluminum.

6. An inductive frequency-selective choke radiating unit according to claim 1, characterized in that, Electrical contacts are provided on the balun plate (31), and the radiating arm (32) is welded to the electrical contacts.

7. An inductive frequency-selective choke radiating unit according to claim 1, characterized in that, The radiating arm (32) also includes a folding section (322), which extends along the length of the radiating arm (32) and is arranged in a curved and folded configuration.

8. An inductive frequency-selective choke radiating unit according to claim 1, characterized in that, The reflector (1) is made of aluminum.

9. An inductive frequency-selective choke isolation strip, characterized in that, The inductive frequency selective choke isolation strip includes a choke section that extends spirally along the length of the inductive frequency selective choke isolation strip to form an inductive structure.

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