Filter, antenna, base station and filter manufacturing method

Abstract

The embodiments of the present application disclose a filter, an antenna, a base station, and a method for manufacturing the filter, which are used to avoid the separate assembly of multiple resonators to reduce the matching accuracy between the resonators. In the present application, the filter includes a first inner conductor, an outer conductor, a first insulating dielectric layer, a second insulating dielectric layer, and a resonator conductor. The first inner conductor is embedded in the first insulating dielectric layer, the resonator conductor is arranged on the surface of the first insulating dielectric layer, and the first insulating dielectric layer is embedded in the second insulating dielectric layer, and the outer conductor is arranged on the surface of the second insulating dielectric layer. Compared with the prior art, while miniaturizing the filter, it does not require the separate assembly of multiple resonators, which reduces the matching accuracy between the resonators.

Description

Technical Field

[0001] The present application relates to the field of communication technology, and in particular to a filter, an antenna, a base station, and a method for manufacturing the filter. Background Art

[0002] Metal coaxial cavity filters are commonly used in wireless base stations. However, as wireless devices become increasingly integrated, the demand for smaller and lighter filters is also increasing. However, metal coaxial cavity filters have a three-dimensional shape and take up a lot of space.

[0003] Therefore, there are some Figure 1 The inline filter is a tubular metal housing having a single inner cavity extending along a longitudinal axis, and a plurality of resonators (250-1, 250-2, 250-3) spaced apart along the longitudinal axis within the single inner cavity, each resonator having a rod (252), wherein the rods of the first and second resonators adjacent to each other in the resonators are rotated to have different angle orientations. The inline filter can achieve miniaturization and lightweighting of the filter.

[0004] However, such structural parts require the assembly and combination of multiple components, the processing technology is relatively complex, and the coupling angle between resonators needs to be controlled, and the consistency requirements are high. Summary of the Invention

[0005] Embodiments of the present application provide a filter, an antenna, a base station, and a method for manufacturing the filter, which are used to avoid separate assembly of multiple resonators to reduce the matching accuracy between the resonators.

[0006] In a first aspect, the present application provides a filter comprising a first inner conductor, an outer conductor, a first insulating dielectric layer, a second insulating dielectric layer, and a resonator conductor. The first inner conductor is embedded in the first insulating dielectric layer, the resonator conductor is arranged on the surface of the first insulating dielectric layer, and the first insulating dielectric layer is embedded in the second insulating dielectric layer, and the outer conductor is arranged on the surface of the second insulating dielectric layer. Compared with the prior art, while miniaturizing the filter, there is no need to assemble multiple resonators separately, which reduces the matching accuracy between the resonators.

[0007] In some feasible implementations, the resonator conductor is in a strip shape and can be conveniently arranged on the surface of the first insulating dielectric layer.

[0008] In some feasible implementations, the length of the resonator conductor is 1 / 2 of the target wavelength. Then, the target wavelength to be filtered can be controlled by controlling the length of the resonator conductor.

[0009] In some feasible implementations, the resonator conductor is arranged on the surface of the first insulating medium layer in a spiral manner, so that the length of the resonator conductor is not limited by the circumference of the cross section of the first insulating medium.

[0010] In some feasible implementations, the resonator conductor is a metal layer on the surface of the second insulating dielectric layer, and slots are provided in the metal layer, and the slots are strip-shaped, providing a layout method.

[0011] In some feasible implementations, the resonator conductor is a flexible film metal layer, which makes it easier to lay out the resonator conductor.

[0012] In some feasible implementations, the resonator conductor is a metal conductor plating layer, which is more feasible in terms of process.

[0013] In some feasible implementations, a second inner conductor and a third insulating dielectric layer, the second inner conductor is embedded in the third insulating dielectric layer; the radius of the third insulating dielectric layer is smaller than the radius of the first inner conductor, and the third insulating dielectric layer is embedded in the first inner conductor, so that a high-pass filter can be realized.

[0014] A second aspect of the present application provides an antenna, comprising the filter described in the various implementations of the first aspect.

[0015] A third aspect of the present application provides a base station, comprising the antenna described in the second aspect.

[0016] A fourth aspect of the present application provides a method for manufacturing a filter, comprising:

[0017] embedding the first inner conductor in the first insulating medium layer;

[0018] Arranging a resonator conductor on the surface of the first insulating dielectric layer;

[0019] embedding the first insulating dielectric layer on which the resonator conductor is arranged in the second insulating dielectric layer;

[0020] The outer conductor is arranged on the surface of the second insulating medium layer.

[0021] In some possible implementations, the resonator conductor is in a strip shape.

[0022] In some feasible implementations, the length of the resonator conductor is 1 / 2 of the target wavelength.

[0023] In some feasible implementations, arranging the resonator conductor on the surface of the first insulating dielectric layer includes: arranging the resonator conductor on the surface of the first insulating dielectric layer in a spiral manner.

[0024] In some feasible implementations, the resonator conductor is a metal layer on the surface of the second insulating dielectric layer, and a groove is provided in the metal layer, and the groove is in a strip shape.

[0025] In some feasible implementations, the resonator conductor is a flexible film metal layer.

[0026] In some possible implementations, the resonator conductor is a metal conductor plating.

[0027] In some feasible implementations, a second inner conductor and a third insulating dielectric layer; the second inner conductor is embedded in the third insulating dielectric layer; the third insulating dielectric layer is embedded in the first inner conductor, and the radius of the third insulating dielectric layer is smaller than the radius of the first inner conductor.

[0028] It can be seen from the above technical solutions that the embodiments of the present application have the following advantages:

[0029] In the present application, the filter includes a first inner conductor, an outer conductor, a first insulating dielectric layer, a second insulating dielectric layer and a resonator conductor. The first inner conductor is embedded in the first insulating dielectric layer, the resonator conductor is arranged on the surface of the first insulating dielectric layer, and the first insulating dielectric layer is embedded in the second insulating dielectric layer, and the outer conductor is arranged on the surface of the second insulating dielectric layer. Compared with the existing technology, while miniaturizing the filter, there is no need to assemble multiple resonators separately, which reduces the matching accuracy between the resonators. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] Figure 1 is a schematic diagram of an embodiment of an in-line filter;

[0031] Figure 2-1 This is a schematic diagram of an antenna feed system in an embodiment of the present application;

[0032] Figure 2-2 Schematic diagram of the internal structure of the antenna in the embodiment of the present application;

[0033] Figure 3-1 is a schematic cross-sectional view of a filter according to an embodiment of the present application;

[0034] Figure 3-2 This is a schematic diagram of a resonator conductor in a strip shape in an embodiment of the present application;

[0035] Figure 3-3 This is another schematic diagram of an embodiment of the present application in which the resonator conductor is in a strip shape;

[0036] Figure 3-4 Schematic diagram of a C-shaped resonator conductor in an embodiment of the present application;

[0037] Figure 3-5 Another schematic diagram of a C-shaped resonator conductor in an embodiment of the present application;

[0038] Figure 3-6 This is a schematic diagram of an embodiment of a high-pass filter when the resonator conductor is in a strip shape in an embodiment of the present application;

[0039] Figure 3-7 Schematic diagram of a high-pass filter when the resonator conductor is C-shaped in an embodiment of the present application;

[0040] Figure 4 This is a schematic diagram of an embodiment of a method for manufacturing a filter in an embodiment of the present application. DETAILED DESCRIPTION

[0041] Embodiments of the present application provide a filter, an antenna, a base station, and a method for manufacturing the filter, which are used to avoid separate assembly of multiple resonators to reduce the matching accuracy between the resonators.

[0042] The embodiments of the present application are described below with reference to the accompanying drawings.

[0043] The terms "first", "second", etc. in the specification and claims of the present application and the above-mentioned drawings are used to distinguish similar objects, and are not necessarily used to describe a specific order or sequential order. It should be understood that the terms used in this way can be interchangeable under appropriate circumstances, and this is merely a way of distinguishing the objects of the same attributes when describing them in the embodiments of the present application. In addition, the terms "including" and "having" and any of their variations are intended to cover non-exclusive inclusions, so that the process, method, system, product or equipment comprising a series of units need not be limited to those units, but may include other units that are not clearly listed or inherent to these processes, methods, products or equipment.

[0044] The technical solutions of the embodiments of the present application can be applied to filters in various data processing communication systems, such as code division multiple access (CDMA), time division multiple access (TDMA), frequency division multiple access (FDMA), orthogonal frequency division multiple access (OFDMA), single carrier frequency division multiple access (SC-FDMA), and long term evolution (LTE) systems. 5th generation (5G) mobile communication systems, new radio (NR) systems, and massive multiple-input multiple-output (Massive MIMO) systems and other systems.

[0045] The term "system" and "network" are interchangeable. A CDMA system can implement radio technologies such as Universal Terrestrial Radio Access (UTRA) and CDMA2000. UTRA can include wideband CDMA (WCDMA) and other CDMA variants. CDMA2000 can cover Interim Standard (IS) 2000 (IS-2000), IS-95, and IS-856. A TDMA system can implement radio technologies such as Global System for Mobile Communications (GSM). An OFDMA system can implement radio technologies such as Evolved Universal Terrestrial Radio Access (E-UTRA), Ultra Mobile Broadband (UMB), IEEE 802.11 (Wi-Fi), IEEE 802.16 (WiMAX), IEEE 802.20, and FlashOFDMA. UTRA and E-UTRA are UMTS and evolved versions of UMTS. 3GPP Long Term Evolution (LTE) and various releases based on LTE are new releases of UMTS that use E-UTRA.

[0046] In addition, the communication system can also be applied to future-oriented communication technologies, and the technical solutions provided in the embodiments of the present application are applicable. The system architecture and business scenarios described in the embodiments of the present application are intended to more clearly illustrate the technical solutions of the embodiments of the present application, and do not constitute a limitation on the technical solutions provided in the embodiments of the present application. It is known to those skilled in the art that with the evolution of network architecture and the emergence of new business scenarios, the technical solutions provided in the embodiments of the present application are also applicable to similar technical problems.

[0047] The filter of the embodiment of the present application can be applied to the antenna feed system of a wireless base station, such as Figure 2-1 As shown, the antenna feed system 200 includes: an antenna 210, a holding pole 220, an antenna adjustment bracket 230, a grounding device 240 and a joint seal 250 (including insulating sealing tape, polyvinyl chloride insulating tape, etc.).

[0048] For example, as shown in the attached Figure 2-2 , which is a schematic diagram of the internal structure of the antenna 210 . The antenna 210 may be located in a radome. The antenna 210 may specifically include: at least one independent array 211 and an antenna connector 212 .

[0049] The independent array 211 includes a radiating element 211-1 and a metal reflector 211-2. The radiating element 211-1 is typically placed above the metal reflector 211-2. Different radiating elements 211-1 can have the same or different frequencies. Each independent array 211 receives or transmits RF signals through its own feed network, which typically consists of a controlled impedance transmission line. The feed network may also include a phase shifter 213, a combiner 214, a filter 215, and a transmission or calibration network 216, among other modules for performance expansion. The feed network can achieve different radiation beam pointing directions or obtain calibration signals required by the system through the transmission or calibration network 216.

[0050] Among them, the radiation unit 211-1 is a unit that constitutes the basic structure of the antenna array and is used to radiate or receive radio waves. The metal reflector 211-2 is used to improve the receiving sensitivity of the antenna signal, reflecting the antenna signal and focusing it at the receiving point, greatly enhancing the receiving / transmitting capabilities of the antenna 210. It also serves to block and shield other radio waves from the back (the opposite direction) from interfering with the received signal. The feeding network is used to feed the signal to the radiation unit 211-1 according to a certain amplitude and phase, or to send the received wireless signal to the signal processing unit of the wireless base station according to a certain amplitude and phase. The radome is a structural component used to protect the antenna feed system 200 from the influence of the external environment. It has good electromagnetic wave penetration characteristics in terms of electrical performance and can withstand the influence of harsh external environments in terms of mechanical performance.

[0051] The transceiver system of a wireless base station primarily consists of a high-frequency filter, oscillator, power amplifier, modem, and power supply. As a fundamental radio frequency unit, the filter filters signals at specific frequencies to obtain the desired signal. Filters are constructed from resonators, which are coupled together through energy. Therefore, miniaturization of the resonators is a key approach to miniaturizing the filters.

[0052] Metal coaxial cavity filters are commonly used in wireless base stations. However, as wireless devices become increasingly integrated, the demand for smaller and lighter filters is also increasing. However, metal coaxial cavity filters have a three-dimensional shape and take up a lot of space.

[0053] Therefore, there are some Figure 1 The inline filter is a tubular metal housing having a single inner cavity extending along a longitudinal axis, and a plurality of resonators (250-1, 250-2, 250-3) spaced apart along the longitudinal axis within the single inner cavity, each resonator having a rod (252), wherein the rods of the first and second resonators adjacent to each other in the resonators are rotated to have different angle orientations. The inline filter can achieve miniaturization and lightweighting of the filter.

[0054] However, such structural parts require the assembly and combination of multiple components, the processing technology is relatively complex, and the coupling angle between resonators needs to be controlled, and the consistency requirements are high.

[0055] To do this, refer to Figure 3-1 The present application proposes a cross-section of a filter 300, including a first inner conductor 310, an outer conductor 320, a first insulating dielectric layer 330, a second insulating dielectric layer 340 and a resonator conductor 350. The first inner conductor 310 is embedded in the first insulating dielectric layer 330, the resonator conductor 350 is arranged on the surface of the first insulating dielectric layer 330, and the first insulating dielectric layer 330 is embedded in the second insulating dielectric layer 340, and the outer conductor 320 is arranged on the surface of the second insulating dielectric layer 340. Compared with the existing technology, while achieving miniaturization of the filter, there is no need to assemble multiple resonators separately, which reduces the matching accuracy between the resonators.

[0056] It should be noted that the first inner conductor 310, the outer conductor 320, the first insulating dielectric layer 330 and the second insulating dielectric layer 340 constitute a coaxial transmission line. It should be noted that the coaxial transmission line is a wide-band microwave transmission line consisting of a guiding system composed of two coaxial cylindrical conductors, with air or a high-frequency dielectric filled between the inner conductor and the outer conductor. In the embodiment of the present application, the first inner conductor 310 is embedded in the first insulating dielectric layer 330, the first insulating dielectric layer 330 is embedded in the second insulating dielectric layer 340, and the outer conductor 320 is arranged on the surface of the second insulating dielectric layer 340. In the embodiment of the present application, by arranging the resonator conductor 350 on the surface of the first insulating dielectric layer 330, compared with the prior art, while achieving miniaturization of the filter, there is no need to assemble multiple resonators separately, which reduces the matching accuracy between the resonators.

[0057] Below, each of the above components is described in detail.

[0058] 1. First inner conductor 310 .

[0059] In some feasible implementations, the material of the first inner conductor 310 can be a conductive metal, such as copper or silver, or other conductive metals, or other conductive materials, without limitation herein. In some feasible implementations, the first inner conductor 310 can be an inner conductor in a coaxial transmission line, in the form of an elongated strip with a circular cross-section. In embodiments of the present application, the first inner conductor 310 can be used to transmit electrical signals.

[0060] 2. First insulating dielectric layer 330 .

[0061] In some feasible implementations, the material of the first insulating dielectric layer 330 can be an insulating medium. It should be noted that a substance that is poor at conducting current is called an insulating medium and has an extremely high resistivity. There are many types of insulating media, including solids such as plastic, rubber, glass, and ceramics; liquids such as various natural mineral oils, silicone oil, and trichlorobiphenyl; and gases such as air, carbon dioxide, and sulfur hexafluoride, which are not limited here.

[0062] In the embodiment of the present application, the first insulating dielectric layer 330 wraps around the first inner conductor 310, and the first inner conductor 310 is embedded in the first insulating dielectric layer 330. The cross-section of the first inner conductor 310 is a hollow circle. By wrapping the first inner conductor 310, the first insulating dielectric layer 330 prevents leakage from the first inner conductor 310, which could cause signal distortion.

[0063] It should be noted that under certain external conditions, such as heating or high voltage, insulating media can "break down," transforming them into conductors. Even before breakdown, insulating media are not completely non-conductive. If a voltage is applied across an insulating medium, a weak current will flow through the material. Therefore, in some feasible implementations, insulating media with appropriate resistivity can be selected as needed.

[0064] 3. Resonator conductor 350.

[0065] Layout method 1.

[0066] In some possible implementations, the resonator conductor 350 is in a strip shape. Figure 3-2 When the resonator conductor 350 is laid flat, it can be a rectangle, a strip, or other strip shapes, which are not limited here. Figure 3-3 As shown, the strip-shaped resonator conductor 350 can be arranged on the surface of the first insulating dielectric layer 330 in a spiral manner, thereby realizing the function of a band-stop filter.

[0067] In some feasible implementations, the resonator conductor 350 may be made of a conductive metal, such as copper or silver, or other conductive metals, or other conductive materials, which are not limited here.

[0068] In some feasible implementations, a flexible metal film layer can be attached to the surface of the first insulating dielectric layer 330. For another example, a metal conductor layer can be electroplated on the surface of the first insulating dielectric layer 330. In some feasible implementations, the resonator conductor 350 can be arranged on the surface of the first insulating dielectric layer 330 using other methods, which are not limited here.

[0069] It should be noted that the length of the resonator conductor 350 is related to the target wavelength to be filtered. In some feasible implementations, the length of the resonator conductor 350 is 1 / 2 of the target wavelength. For example, if the target wavelength is 0.01 mm, the length of the resonator conductor 350 is 0.005 mm.

[0070] Layout method 2.

[0071] In some possible implementations, such as Figure 3-4 As shown, the resonator conductor 350 is a metal layer on the surface of the second insulating dielectric layer 340, and a groove is provided in the metal layer, and the groove is in the shape of a strip. For example, when the resonator conductor 350 is laid flat, its groove can be rectangular, can be a long strip, or can be other strip shapes, which are not limited here. In some feasible implementations, such as Figure 3-5As shown, the grooves may be arranged in a C-shape on the surface of the first insulating dielectric layer 330 , which is not limited here.

[0072] In some feasible implementations, the resonator conductor 350 may be made of a conductive metal, such as copper or silver, or other conductive metals, or other conductive materials, which are not limited here.

[0073] In some feasible implementations, a flexible metal film layer can be attached to the surface of the first insulating dielectric layer 330 to implement the band-stop filter function. For another example, a metal conductor layer can be electroplated on the surface of the first insulating dielectric layer 330. In some feasible implementations, the resonator conductor 350 can be arranged on the surface of the first insulating dielectric layer 330 using other methods, which are not limited here.

[0074] It should be noted that the length of the slot of the resonator conductor 350 is related to the target wavelength to be filtered. In some feasible implementations, the length of the resonator conductor 350 is 1 / 2 of the target wavelength. For example, if the target wavelength is 0.01 mm, the length of the resonator conductor 350 is 0.005 mm.

[0075] 4. Second insulating dielectric layer 340 .

[0076] In some feasible implementations, the material of the second insulating dielectric layer 340 can be an insulating medium. It should be noted that a substance that is not good at conducting electric current is called an insulating medium and has an extremely high resistivity. There are many types of insulating media, including solids such as plastics, rubber, glass, and ceramics, liquids such as various natural mineral oils, silicone oil, and trichlorobiphenyl, and gases such as air, carbon dioxide, and sulfur hexafluoride, which are not limited here. In some feasible implementations, an insulating medium with a corresponding resistivity can be selected as needed.

[0077] In the embodiment of the present application, the second insulating medium layer 340 wraps the first inner conductor 310 on which the resonator conductor 350 is arranged, that is, the second insulating medium layer 340 wraps the first inner conductor 310 on which the resonator conductor 350 is arranged, thereby avoiding leakage of the first inner conductor 310 and causing signal distortion.

[0078] 5. Outer conductor 320.

[0079] In some feasible implementations, the outer conductor 320 can be made of a conductive metal, such as copper or silver, or other conductive metals, or other conductive materials, without limitation. In some feasible implementations, the outer conductor 320 can be the outer conductor of a coaxial transmission line, in the form of an elongated strip with a circular cross-section. In the embodiment of the present application, the outer conductor 320 is disposed on the surface of the second insulating dielectric layer 340 to shield the signal and prevent signal leakage.

[0080] In the embodiment of the present application, the filter 300 of the above-mentioned type is electroplated or film-coated on the insulating layers of the inner and outer conductors at one time, thereby reducing the need for additional external filter components and eliminating the need for separate assembly of multiple resonators to reduce the matching accuracy between the resonators. The filter can also be independently embedded in a coaxial transmission line.

[0081] 6. The second inner conductor 360 and the third insulating medium layer 370 .

[0082] In some possible implementations, such as Figure 3-6 shown or Figure 3-7 The filter 300 can also include a second inner conductor 360 and a third insulating dielectric layer 370, wherein the second inner conductor 360 is embedded in the third insulating dielectric layer 370, the radius of the third insulating dielectric layer 370 is smaller than the radius of the first inner conductor 310, and the third insulating dielectric layer 370 is embedded in the first inner conductor 310, thereby realizing the function of a high-pass filter.

[0083] In the embodiment of the present application, the filter 300 of the above-mentioned type is electroplated or film-coated on the insulating layers of the inner and outer conductors at one time, thereby reducing the need for additional external filter components and eliminating the need for separate assembly of multiple resonators to reduce the matching accuracy between the resonators. The resonators can be independently embedded in the coaxial transmission line.

[0084] The present application also provides an antenna, comprising the filter as described above.

[0085] The present application also provides a base station, comprising the antenna as described above.

[0086] Please refer to Figure 4 , the present application also provides a method for manufacturing a filter, comprising:

[0087] 401. Embed a first inner conductor in a first insulating medium layer.

[0088] 402. Arrange a resonator conductor on a surface of the first insulating dielectric layer.

[0089] In some possible implementations, the resonator conductor is in the shape of a strip.

[0090] In some possible implementations, the length of the resonator conductor is 1 / 2 of the target wavelength.

[0091] In some feasible implementations, the resonator conductor is arranged on the surface of the first insulating dielectric layer in a spiral manner.

[0092] In some possible implementations, the resonator conductor is a flexible film metal layer.

[0093] In some possible implementations, the resonator conductor is a metal conductor plating.

[0094] In some feasible implementations, the resonator conductor is a metal layer on the surface of the second insulating dielectric layer, and a groove is provided in the metal layer, and the groove is in a strip shape.

[0095] 403. Embed the first insulating dielectric layer in the second insulating dielectric layer.

[0096] 404. Arrange the outer conductor on the surface of the second insulating medium layer.

[0097] In some feasible implementations, the second inner conductor and the third insulating dielectric layer are embedded in the second inner conductor in the third insulating dielectric layer, and the third insulating dielectric layer is embedded in the first inner conductor, and the radius of the third insulating dielectric layer is smaller than the radius of the first inner conductor.

[0098] It should be noted that for the aforementioned method embodiments, for the sake of simplicity, they are all expressed as a series of action combinations, but those skilled in the art should be aware that this application is not limited by the order of the actions described, because according to this application, certain steps can be performed in other orders or simultaneously. Secondly, those skilled in the art should also be aware that the embodiments described in the specification are all preferred embodiments, and the actions and modules involved are not necessarily required by this application.

[0099] It should be noted that the information interaction, execution process, etc. between the modules / units of the above-mentioned device are based on the same concept as the method embodiment of the present application, and the technical effects they bring are the same as those of the method embodiment of the present application. For specific contents, please refer to the description in the method embodiment shown above in the present application, and no further details will be given here.

Claims

1. A filter, characterized in that: include: a first inner conductor, an outer conductor, a first insulating dielectric layer, a second insulating dielectric layer, and a resonator conductor; wherein the first inner conductor, the outer conductor, the first insulating dielectric layer, and the second insulating dielectric layer constitute a coaxial transmission line; The first inner conductor is embedded in the first insulating dielectric layer, and the resonator conductor is arranged on the surface of the first insulating dielectric layer; The first insulating dielectric layer on which the resonator conductor is arranged is embedded in the second insulating dielectric layer, and the outer conductor is arranged on the surface of the second insulating dielectric layer.

2. The filter according to claim 1, characterized in that The resonator conductor is in a strip shape.

3. The filter according to claim 2, characterized in that The length of the resonator conductor is 1 / 2 of the target wavelength.

4. The filter according to claim 2 or 3, characterized in that: The resonator conductor is arranged on the surface of the first insulating medium layer and includes: The resonator conductor is arranged on the surface of the first insulating medium layer in a spiral manner.

5. The filter according to claim 1, characterized in that The resonator conductor is a metal layer on the surface of the second insulating medium layer, and a groove is provided in the metal layer, and the groove is in a strip shape.

6. The filter according to any one of claims 1 to 3, characterized in that: The resonator conductor is a flexible film metal layer.

7. The filter according to any one of claims 1 to 3, characterized in that: The resonator conductor is a metal conductor plating layer.

8. The filter according to any one of claims 1 to 3, characterized in that: Also includes: a second inner conductor and a third insulating dielectric layer, wherein the second inner conductor is embedded in the third insulating dielectric layer; The radius of the third insulating medium layer is smaller than the radius of the first inner conductor, and the third insulating medium layer is embedded in the first inner conductor.

9. An antenna, characterized in that: Comprising the filter according to any one of claims 1-8.

10. A base station, characterized in that: Comprising the antenna as claimed in claim 9.

11. A method for manufacturing a filter, characterized in that: include: embedding the first inner conductor in the first insulating medium layer; Arranging a resonator conductor on the surface of the first insulating dielectric layer; embedding the first insulating dielectric layer on which the resonator conductor is arranged in the second insulating dielectric layer; The outer conductor is arranged on the surface of the second insulating dielectric layer; wherein the first inner conductor, the outer conductor, the first insulating dielectric layer and the second insulating dielectric layer constitute a coaxial transmission line.

12. The method according to claim 11, characterized in that: The resonator conductor is in a strip shape.

13. The method according to claim 12, characterized in that: The length of the resonator conductor is 1 / 2 of the target wavelength.

14. The method according to claim 12 or 13, characterized in that: The step of arranging the resonator conductor on the surface of the first insulating medium layer comprises: The resonator conductor is arranged on the surface of the first insulating medium layer in a spiral manner.

15. The method according to claim 11, characterized in that: The resonator conductor is a metal layer on the surface of the second insulating medium layer, and a groove is provided in the metal layer, and the groove is in a strip shape.

16. The method according to any one of claims 11 to 13, characterized in that: The resonator conductor is a flexible film metal layer.

17. The method according to any one of claims 11 to 13, characterized in that: The resonator conductor is a metal conductor plating layer.

18. The method according to any one of claims 11 to 13, characterized in that: Also includes: a second inner conductor and a third insulating dielectric layer; embedding the second inner conductor in the third insulating medium layer; The third insulating medium layer is embedded in the first inner conductor, and the radius of the third insulating medium layer is smaller than the radius of the first inner conductor.

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