Base station filter and multiplexer

Abstract

The utility model discloses a base station filter and a multiplexer, a base station downlink of the base station filter adopts a metal resonant cavity or a medium resonant cavity for power input, at least one path of a base station uplink adopts a radio frequency filter, and the radio frequency filter is smaller in size than the metal resonant cavity or the medium resonant cavity, so that the power input is realized. The size of a base station filter and a multiplexer can be effectively reduced.

Description

Technical Field

[0001] This utility model relates to the field of filter technology, specifically to a base station filter and multiplexer. Background Technology

[0002] Base station filters are key components in wireless communication systems. Their main function is to filter electromagnetic signals, allowing only signals of specific frequencies to pass through, thereby resolving interference issues between different frequency bands and different wireless communication systems. For example, the base station filter with announcement number CN206225510U has signal input ports and signal output ports. The signal input port receives the signal, and the signal output port outputs the signal.

[0003] Existing base station filters use all-metal cavities or metal cavity dielectric resonators for both the signal input and output ends, resulting in a large filter size. Since metal cavity filters have already achieved their limits in terms of both size and weight, there is no better way to reduce their size and weight. Utility Model Content

[0004] The purpose of this invention is to overcome the above-mentioned technical deficiencies and propose a base station filter and multiplexer to solve the technical problem of the large size of existing base station filters and multiplexers.

[0005] To achieve the above-mentioned technical objectives, the present invention adopts the following technical solution:

[0006] In a first aspect, this utility model provides a base station filter, comprising:

[0007] The base station downlink employs a metal resonant cavity or a dielectric resonant cavity; and

[0008] The base station uplink, at least one of which uses a radio frequency filter.

[0009] In some embodiments, the radio frequency filter may be a surface acoustic wave filter, the bulk acoustic wave filter, the thin-film cavity acoustic filter, an LTCC filter, or an IPD filter. At least one uplink of the base station uses a metal resonant cavity or a dielectric resonant cavity, and the remaining links use the surface acoustic wave filter, the bulk acoustic wave filter, the thin-film cavity acoustic filter, an LTCC filter, or an IPD filter.

[0010] In some embodiments, the radio frequency filters are integrated via a PCB board.

[0011] In some embodiments, each of the radio frequency filters is coupled to the metal resonant cavity or dielectric resonant cavity of the base station uplink via a microstrip transmission line connected to the PCB board.

[0012] In some embodiments, the microstrip transmission line contacts the resonant rod to form magnetic coupling.

[0013] In some embodiments, the microstrip transmission line does not contact the resonant rod to form an electrical coupling.

[0014] In a first aspect, this utility model also provides a multiplexer, including the base station filter, wherein the base station downlink of the base station filter serves as the TX transmitter of the multiplexer, the TX transmitter employs a metal filter or a dielectric filter, and the base station uplink of the base station filter serves as the RX receiver of the multiplexer, wherein at least one of the RX receivers employs a radio frequency filter.

[0015] Compared with the prior art, the base station filter provided by this utility model uses a metal resonant cavity or a dielectric resonant cavity for power input in the base station downlink, and at least one path of the base station uplink uses an RF filter. Since the RF filter is smaller in size than the metal resonant cavity or the dielectric resonant cavity, the filter can effectively reduce the size of the base station filter while achieving power output. Attached Figure Description

[0016] Figure 1 This is a top view of an existing base station filter;

[0017] Figure 2 This is a top view of the base station filter provided in this embodiment of the utility model.

[0018] Labels for each item in the figure:

[0019] 10 — Signal input terminal 20 — Signal output terminal

[0020] 30—Base station downlink 40—Base station uplink

[0021] 11—Metal resonant cavity or dielectric resonant cavity

[0022] 41—Radio frequency filter. Detailed Implementation

[0023] To make the objectives, technical solutions, and advantages of this utility model clearer, the present utility model will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the present utility model and are not intended to limit the present utility model.

[0024] The existing base station filter has a signal input terminal 10 and a signal output terminal 20 (signal input terminal 10 and signal output terminal 20 are connected in series with each other). Figure 1 (Line a in the diagram is the dividing line). Both the signal input terminal 10 and the signal output terminal 20 adopt the form of a metal resonant cavity or a dielectric resonant cavity 11, which makes the filter larger in size.

[0025] To address the issue of the large size of existing base station filters and multiplexers, this invention provides a base station filter and multiplexer that can reduce their size while simultaneously enabling power signal input and output.

[0026] The base station filter provided by this utility model includes a base station downlink 30 and a base station uplink 40 (the base station downlink 30 and the base station uplink 40 are connected in series). Figure 2 (The b line in the diagram is the dividing line). The downlink 30 of the base station uses a metal resonant cavity or a dielectric resonant cavity 11; at least one of the uplinks 40 of the base station uses a radio frequency filter 41.

[0027] Specifically, the base station downlink 30 of the base station filter uses a metal resonant cavity or a dielectric resonant cavity 11 for power input, and at least one of the base station uplink 40 uses a radio frequency filter 41. Since the radio frequency filter 41 is smaller in size than the metal resonant cavity or the dielectric resonant cavity 11, the base station filter is smaller in size than existing filters, thereby enabling the filter to effectively reduce the size of the base station filter while achieving power output.

[0028] In this embodiment, the radio frequency filter 41 can be a surface acoustic wave filter, a bulk acoustic wave filter, a thin-film cavity acoustic filter, an LTCC filter, or an IPD filter. At least one uplink of the base station uses a metal resonant cavity or a dielectric resonant cavity, and the remaining links use surface acoustic wave filters, bulk acoustic wave filters, thin-film cavity acoustic filters, LTCC filters, or IPD filters.

[0029] In this embodiment, surface acoustic wave (SAW) is low-cost and suitable for low-frequency bands; bulk acoustic wave (BAW) is suitable for high-frequency bands and has better performance; thin-film cavity resonator (FBAR), with its unique structure and performance, provides more options for modern communication equipment, and the RF filter 41 has a small size; the LTCC filter is a multilayer ceramic microwave filter based on low-temperature co-fired ceramic technology, which integrates multiple inductors, capacitors, and resistors onto a ceramic substrate and is sintered at low temperature. The LTCC filter features miniaturization, high performance, and low cost; the IPD filter, short for Integrated Passive Device Filter, is a high-performance passive device manufactured using advanced wafer manufacturing processes, including thin-film technology and photolithography; the IPD filter, through integrated passive device technology, has a smaller size and higher integration density compared to traditional passive devices. All of the above filters can reduce the size of the base station uplink 40 of the base station filter, thereby reducing the overall size of the base station filter.

[0030] Understandably, the base station downlink 30 of the base station filter can use all metal resonators, all dielectric resonators, or a combination of metal and dielectric resonators.

[0031] Understandably, the base station uplink 40 of the base station filter can be a radio frequency filter 41, or a radio frequency filter 41 can be combined with a traditional metal resonant cavity or dielectric resonant cavity 11.

[0032] In this embodiment, the base station uplink 40 and the base station downlink 30 are coupled using a specific coupling structure.

[0033] In one embodiment, the base station uplink 40 is coupled to the base station downlink 30 via a common cavity. Specifically, the base station uplink 40 and the base station downlink 30 exchange energy through a common area (i.e., the common cavity). Coupling via the common cavity can improve filter performance, reduce filter size, and enable simultaneous operation of multiple frequency bands.

[0034] In one embodiment, the base station uplink 40 is coupled to the base station downlink 30 using ANT (Advanced and Adaptive Network Technology) signals. Specifically, ANT is a wireless communication technology that uses the propagation of electromagnetic waves in space to couple circuits, enabling information transmission and reception. It has the advantages of low latency and no need to maintain channel synchronization.

[0035] In one embodiment, at least one uplink 40 of the base station employs a metal resonant cavity or a dielectric resonant cavity 11, while the remaining links employ radio frequency filters 41. Specifically, the metal resonant cavity or the dielectric resonant cavity 11 can suppress a portion of the power of the base station uplink 40, thereby improving the power output performance of the filter.

[0036] In one embodiment, the radio frequency filter 41 is integrated via a PCB board. Specifically, the integration of the radio frequency filter 41 via a PCB board facilitates coupling of the radio frequency filter 41 with the base station uplink 40, thereby achieving integration of the base station uplink 40 and reducing the size of the filter.

[0037] In this embodiment, the PCB board is fixed to the cavity by threaded connectors, or by bonding, welding or riveting.

[0038] In one embodiment, the radio frequency filter 41 is coupled to the metal resonant cavity or dielectric resonant cavity 11 of the base station uplink 40 via a microstrip transmission line connected to the PCB board. Specifically, the microstrip transmission line coupling can utilize the interaction of electromagnetic fields to achieve selective signal transmission.

[0039] In one embodiment, the microstrip transmission line contacts the resonant rod to form magnetic coupling. Specifically, the microstrip transmission line forms magnetic coupling between the RF filter 41 and the metal or dielectric resonant cavity 11 by connecting the resonant rod to the metal or dielectric resonant cavity 11.

[0040] In one embodiment, the microstrip transmission line does not contact the resonant rod to form electrical coupling. Specifically, the microstrip transmission line can form a capacitor structure with the resonant rod through the resonant rod that does not contact the metal resonant cavity or dielectric resonant cavity 11, thereby forming electrical coupling between the RF filter 41 and the metal resonant cavity or dielectric resonant cavity 11.

[0041] In this embodiment, the coupling strength of the RF filter 41 with the metal resonant cavity or the dielectric resonant cavity 11 can be adjusted by controlling the bandwidth of the microstrip transmission line.

[0042] In one embodiment, the base station uplink 40 employs an RF filter 41. Specifically, all paths of the base station uplink 40 employ RF filters 41, which can further reduce the size of the filter, but the power output performance is relatively low.

[0043] The multiplexer provided in this embodiment includes a base station filter. The base station downlink 30 of the base station filter serves as the TX transmitter of the multiplexer. The TX transmitter uses a metal filter or a dielectric filter. The base station uplink 40 of the base station filter serves as the RX receiver of the multiplexer. At least one of the RX receivers uses a surface acoustic wave (SAW) filter, a bulk acoustic wave (BAW) filter, or a thin-film cavity acoustic resonator (FBAR) filter.

[0044] Specifically, when the base station filter mentioned above is used as a multiplexer, the base station downlink 30 of the base station filter serves as the TX transmitter of the multiplexer. Each path of the TX transmitter forms a conventional metal filter or dielectric filter through a metal resonant cavity or dielectric resonant cavity 11. The base station uplink 40 of the base station filter serves as the RX receiver of the multiplexer. At least one path of the RX receiver forms a SAW filter, BAW filter, or FBAR filter through a radio frequency filter 41. The SAW filter, BAW filter, or FBAR filter of the RX receiver is smaller in size than a conventional metal filter or dielectric filter, which reduces the size of the multiplexer.

[0045] The specific embodiments of this utility model described above do not constitute a limitation on the scope of protection of this utility model. Any other corresponding changes and modifications made based on the technical concept of this utility model should be included within the scope of protection of the claims of this utility model.

Claims

1. A base station filter, characterized by The base station downlink employs a metal resonant cavity or a dielectric resonant cavity. The base station uplink employs at least one radio frequency filter. The radio frequency filter can be a surface wave filter, a bulk acoustic wave filter, a thin film acoustic filter, an LTCC filter or an IPD filter. The base station uplink employs at least one metal resonant cavity or dielectric resonant cavity, and the remaining paths employ the surface wave filter, the bulk acoustic wave filter, the thin film acoustic filter, the LTCC filter or the IPD filter. Each of the radio frequency filters is integrated through a PCB board.

2. The base station filter of claim 1, wherein, Each of the radio frequency filters is coupled to the metal resonant cavity or the dielectric resonant cavity of the base station uplink through a microstrip transmission line connected to the PCB board.

3. The base station filter of claim 2, wherein, The microstrip transmission line forms a magnetic coupling by contacting a resonant rod.

4. The base station filter of claim 3, wherein, The microstrip transmission line forms an electric coupling by not contacting a resonant rod.

5. The base station filter of claim 3, wherein, The base station filter of any one of claims 1-5, wherein the base station downlink of the base station filter serves as a TX transmitting end of a multiplexer, and the TX transmitting end employs a metal filter or a dielectric filter; and wherein the base station uplink of the base station filter serves as an RX receiving end of the multiplexer, and the RX receiving end employs at least one radio frequency filter.

6. A multiplexer, characterized by ​

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