An RF coupler

Abstract

The application discloses an RF coupler, and belongs to the technical field of communication, which comprises a shell, a radio frequency signal transmission assembly arranged in the shell, and a plurality of foot positions arranged at the bottom of the shell; the height dimension of the shell is 4.80+ / -0.3 mm, the length dimension is 8.30+ / -0.3 mm, and the width dimension is 6.4+ / -0.3 mm; the radio frequency signal transmission assembly comprises six ports, two of which are bidirectional input / output ends, two are bidirectional coupling / isolation ends, and two are ground ends. The novel RF coupler can be directly adapted to mini Internet of Things terminals, small intercoms and other space-limited radio frequency equipment through reasonable size design, so that the problem of difficulty in embedding the integrated small equipment caused by the large volume of the shell is avoided; meanwhile, the installation space of the radio frequency signal transmission assembly reserved in the shell is stable and consistent, the component layout disorder caused by the size deviation is avoided, a structural basis is provided for subsequent stable transmission of full-band signals, and the adaptability of batch assembly is improved.

Description

Technical Field

[0001] This utility model relates to the field of communication technology, and in particular to an RF coupler. Background Technology

[0002] As a core passive device for radio frequency signal processing, RF couplers are widely used in wireless communication (such as walkie-talkies and IoT terminals) and industrial control RF modules in the 1-800MHz frequency band. Their core function is to couple and extract radio frequency signals and isolate interference. At the same time, they need to meet the practical application requirements of "miniaturized integration, batch assembly compatibility, and stable performance across the entire frequency band"—especially in portable, high-density integrated RF devices, where the size design of the coupler directly determines the PCB board space utilization, batch production yield, and signal transmission quality across the entire frequency band.

[0003] However, existing RF couplers often face a trade-off between size design and performance / integration: to avoid signal transmission disturbances in high-frequency bands, some couplers need to be designed with a large size, making them difficult to adapt to miniaturized devices; if the size is forcibly reduced to improve integration, the internal signal path and impedance matching structure are easily limited, leading to performance fluctuations across the entire frequency band, failing to meet the stability requirements of wide-band applications. At the same time, existing couplers have insufficient dimensional tolerance control and batch assembly adaptability, easily causing PCB pad misalignment problems, affecting production yield; and the size design is mostly aimed at a single frequency band, which does not match the performance requirements of the entire frequency band, increasing the difficulty of adaptation to downstream devices, making it difficult to meet the comprehensive application requirements of miniaturization, mass production, and full-band stability. Utility Model Content

[0004] The main purpose of this utility model is to provide an RF coupler that solves the problems of existing RF couplers being prone to performance issues due to unreasonable size design, poor batch assembly adaptability, and mismatch with full-band performance requirements.

[0005] To achieve the above objectives, this utility model provides an RF coupler, including a housing, an RF signal transmission component disposed within the housing, and a plurality of pins spaced apart at the bottom of the housing; the housing has a height of 4.80±0.3mm, a length of 8.30±0.3mm, and a width of 6.4±0.3mm; the RF signal transmission component includes 6 ports, of which two ports are bidirectional input / output terminals, two ports are bidirectional coupling / isolation terminals, and two ports are ground terminals.

[0006] Preferably, the width of any of the said feet is 1.02±0.3mm, the length is 1.72±0.3mm, and the distance between two adjacent said feet is 2.54mm±0.3mm.

[0007] Preferably, the number of pins is 6, and the 6 pins correspond one-to-one with the 6 ports, and the 6 pins are evenly spaced along the length of the housing.

[0008] Preferably, the radio frequency signal transmission component further includes a signal matching structure, which is electrically connected to the six ports. The signal matching structure is used to stabilize the coupling of radio frequency signals in the 1-800MHz frequency band when they are transmitted between the ports at 18.5-21.8dB.

[0009] Preferably, the housing is made of a high-temperature resistant insulating material, and the temperature resistance range of the high-temperature resistant insulating material is -55℃ to 100℃.

[0010] Beneficial effects: 1. This utility model discloses an RF coupler that, through a reasonable size design, can be directly adapted to space-constrained radio frequency devices such as micro IoT terminals and small walkie-talkies, thereby avoiding the integration problem caused by an excessively large housing size, which makes it difficult to embed into small devices. At the same time, it ensures that the reserved installation space for radio frequency signal transmission components inside the housing is stable and consistent, avoiding component layout disorder caused by size deviations, providing a structural foundation for subsequent stable transmission of full-band signals, and improving the adaptability of mass assembly.

[0011] 2. This utility model discloses an RF coupler that supports bidirectional signal transmission within the 1-800MHz frequency band through two bidirectional input / output terminals. It eliminates the need to adjust port wiring according to signal flow direction, and allows flexible selection of input / output direction for both low-frequency and high-frequency signals. The two bidirectional coupling / isolation terminals work in conjunction with the bidirectional input / output terminals. When the signal is transmitted in reverse, the functions of the coupling and isolation terminals can switch synchronously, ensuring stable extraction of coupled signals and isolation of interference signals across the entire frequency band, meeting full-band performance requirements. Two independent grounding terminals can be connected to the subsequent PCB ground line via a short path, effectively reducing parasitic inductive interference during high-frequency signal transmission, further ensuring signal purity and reliable operation. Attached Figure Description

[0012] To more clearly illustrate the technical solutions in the embodiments of this application or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0013] Figure 1 This is a schematic diagram of the structure of an RF coupler according to an embodiment of the present invention from a first-view perspective; Figure 2This is a schematic diagram of the structure of an RF coupler according to an embodiment of the present invention from a second perspective; Figure 3 This is an electrical schematic diagram of an RF coupler according to an embodiment of the present invention; Figure 4 This is a test data diagram of an RF coupler according to an embodiment of this utility model; Figure 5 This is a full-band coupling characteristic curve of an RF coupler according to an embodiment of the present invention; Figure 6 This is a full-band insertion loss characteristic curve of an RF coupler according to an embodiment of the present invention; Figure 7 This is a full-band VSWR characteristic curve of an RF coupler according to an embodiment of the present invention.

[0014] In the diagram: 1-Housing; 2-Pins; 3-Port. Detailed Implementation

[0015] To make the objectives, technical solutions, and advantages of the embodiments of this application clearer, the technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments. The components of the embodiments of this application described and shown in the accompanying drawings can generally be arranged and designed in various different configurations.

[0016] Therefore, the following detailed description of the embodiments of this application provided in the accompanying drawings is not intended to limit the scope of the claimed application, but merely to illustrate selected embodiments of the application. All other embodiments obtained by those skilled in the art based on the embodiments of this application without inventive effort are within the scope of protection of this application.

[0017] It should be noted that similar labels and letters in the following figures indicate similar items. Therefore, once an item is defined in one figure, it does not need to be further defined and explained in subsequent figures.

[0018] In the description of this application, it should be noted that the use of terms such as "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer" to indicate orientation or positional relationships is based on the orientation or positional relationships shown in the accompanying drawings, or the orientation or positional relationships commonly used when the product is in use. These terms are used solely for the convenience of describing this application and for simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this application. Furthermore, the use of terms such as "first" and "second" in the description of this application is only used to distinguish descriptions and should not be construed as indicating or implying relative importance.

[0019] Furthermore, the use of terms such as "horizontal" and "vertical" in the description of this application does not imply that the component is required to be absolutely horizontal or suspended, but rather that it may be slightly tilted. For example, "horizontal" simply means that its direction is more horizontal relative to "vertical," and does not mean that the structure must be completely horizontal, but rather that it may be slightly tilted.

[0020] In the description of this application, it should also be noted that, unless otherwise expressly specified and limited, the terms "set up," "install," "connect," and "link" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection between two components. Those skilled in the art can understand the specific meaning of the above terms in this application based on the specific circumstances.

[0021] Example 1: This invention proposes an RF coupler.

[0022] In one embodiment of the present invention, an RF coupler includes a housing 1, a radio frequency signal transmission component disposed within the housing 1, and a plurality of pins 2 spaced apart at the bottom of the housing 1; the housing 1 has a height of 4.80±0.3mm, a length of 8.30±0.3mm, and a width of 6.4±0.3mm; the radio frequency signal transmission component includes six ports 3, of which two ports 3 are bidirectional input / output terminals, two ports 3 are bidirectional coupling / isolation terminals, and two ports 3 are ground terminals.

[0023] Specifically, such as Figures 1 to 7As shown, in the RF coupler of this utility model, the length, width, and height of the housing 1 are 8.30±0.3mm, 6.4±0.3mm, and 4.80±0.3mm, respectively, with tolerances strictly controlled within ±0.3mm. On the one hand, the compact size can directly adapt to space-constrained RF devices such as micro IoT terminals and small walkie-talkies, thereby avoiding the integration problem caused by the excessive size of the housing 1, which makes it difficult to embed into small devices. On the other hand, the strict dimensional tolerances ensure that the reserved installation space for RF signal transmission components inside the housing 1 is stable and consistent, avoiding component layout disorder caused by dimensional deviations, providing a structural foundation for subsequent stable transmission of signals across the entire frequency band, and improving the adaptability of mass assembly.

[0024] Furthermore, among the six ports 3 in the RF signal transmission component, two ports 3 are bidirectional input / output terminals. These two bidirectional input / output terminals can support bidirectional transmission of signals within the 1-800MHz frequency band without adjusting the port 3 wiring according to the signal flow direction. The input / output direction can be flexibly selected for both low-frequency (1-300MHz) and high-frequency (600-800MHz) signals. Simultaneously, two ports 3 are bidirectional coupling / isolation terminals, which work in conjunction with the bidirectional input / output terminals. When the signal is transmitted in reverse, the functions of the coupling and isolation terminals can switch synchronously, ensuring stable extraction of coupled signals and isolation of interference signals across the entire frequency band. Additionally, two ports 3 are ground terminals. These two independent ground terminals can be connected to the subsequent PCB ground line via a short path, effectively reducing parasitic inductive interference during high-frequency signal transmission and further ensuring signal purity and reliability. Furthermore, the housing 1 can be securely mounted to the PCB board via several pins 2, resulting in a simple and reasonable structural design.

[0025] It is worth noting that the RF coupler of this invention can be optimized and tuned through simulation software during the actual production and manufacturing process, and its test simulation results are provided by... Figures 4 to 7 It can be known that...

[0026] In one embodiment, the width of any pin 2 is 1.02±0.3mm, the length is 1.72±0.3mm, and the distance between two adjacent pins 2 is 2.54mm±0.3mm. Specifically, in this embodiment, the width of any pin 2 is set to 1.02±0.3mm, which matches the width of the pads for RF devices on a conventional PCB board. This avoids the problem of insufficient pad coverage due to pin 2 being too wide or too narrow resulting in an insufficient soldering area, ensuring the basic compatibility between pin 2 and the pad. The length of pin 2 is set to 1.72±0.3mm, which ensures that the contact area between pin 2 and the pad is not less than 1.75mm. 2This effectively reduces contact resistance and avoids additional energy loss during RF signal transmission due to excessive contact resistance. At the same time, the spacing between two adjacent pins 2 is strictly controlled at 2.54mm ± 0.3mm. This spacing can directly adapt to the conventional pad layout of existing PCB boards and the positioning accuracy of automated pick-and-place machines. Downstream manufacturers do not need to design customized pads to adapt to this RF coupler, which greatly reduces the risk of pad misalignment during batch assembly.

[0027] In one embodiment, there are six pins 2, each corresponding to one of the six ports 3, and the six pins 2 are evenly spaced along the length of the housing 1. Specifically, as shown... Figure 1 and Figure 2 As shown, in this embodiment, the width of any pin 2 is set to 1.02±0.3mm. This width matches the width of the pads for RF devices on a conventional PCB board, avoiding the problem of insufficient pad coverage due to pin 2 being too wide or too narrow resulting in an insufficient soldering area, thus ensuring the basic compatibility between pin 2 and the pad. Simultaneously, the length of pin 2 is set to 1.72±0.3mm. This length design ensures that the contact area between pin 2 and the pad is not less than 1.75mm² (calculated from 1.02mm × 1.72mm), thereby effectively reducing contact resistance and preventing excessive contact resistance. This results in additional energy loss during RF signal transmission. Furthermore, the spacing between two adjacent pins 2 is controlled at 2.54mm ± 0.3mm. This spacing is compatible with the standardized surface mount spacing commonly used in the electronics industry (such as the spacing used for conventional 0805 package components and pin headers). It can be directly applied to the conventional pad layout of existing PCB boards and the positioning accuracy of automated placement machines. Downstream manufacturers do not need to design and customize pads separately to adapt to the RF coupler of this utility model, thereby greatly reducing the risk of pad misalignment caused by non-standard spacing during batch assembly and improving the practicality and market adaptability of mass production.

[0028] In one embodiment, the radio frequency signal transmission component further includes a signal matching structure electrically connected to six ports 3. The signal matching structure is used to stabilize the coupling of radio frequency signals in the 1-800MHz frequency band during transmission between ports 3 at 18.5-21.8 dB. Specifically, as... Figures 4 to 7As shown, the signal matching structure in the RF signal transmission component can balance the energy distribution of signals from different frequency bands during transmission between ports 3 by using impedance adjustment elements (such as microstrip lines and high-frequency compensation capacitors) adapted to the wavelengths of signals in the 1-800MHz frequency band. This avoids uneven coupling energy caused by frequency band differences. Compared to existing RF couplers without matching structures, this embodiment, through the synergistic effect of the signal matching structure and the six ports 3, can control the coupling fluctuation amplitude within the entire 1-800MHz frequency band to within 3.3dB (i.e., the 18.5-21.8dB range), ensuring that regardless of whether the signal is in the low-frequency band (1-300MHz) or the high-frequency band (600MHz), the coupling fluctuation amplitude can be controlled within 3.3dB (i.e., the 18.5-21.8dB range). (0-800MHz), the signal strength obtained by downstream devices from coupling port 3 always remains within a stable range, eliminating the need for additional coupling compensation circuits. This not only solves the problems of low detection accuracy and cumbersome debugging of downstream devices caused by unstable coupling in existing technologies, but also achieves two major technical effects: First, it ensures the consistency of coupling signal strength within a wide frequency band of 1-800MHz, improves the reliability of signal processing in downstream RF devices, and reduces device misjudgments caused by coupling fluctuations; Second, it eliminates the need for coupling compensation circuit design in downstream devices, reducing the overall R&D cost and PCB space occupation of the RF system, and further adapting to the integration needs of miniaturized devices.

[0029] In one embodiment, the housing 1 is made of a high-temperature resistant insulating material with a temperature resistance range of -55°C to 100°C. Specifically, the housing 1 can be made of high-temperature resistant insulating materials such as modified epoxy resin or high-frequency ceramic composite materials. This not only prevents the conductivity of the housing 1 from interfering with the internal radio frequency signals, but its temperature resistance of -55°C to 100°C also ensures the structural stability of the coupler in different application scenarios.

[0030] The above description is merely a preferred embodiment of this application and is not intended to limit this application. Various modifications and variations can be made to this application by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this application should be included within the protection scope of this application.

Claims

1. An RF coupler, characterized in that, The device includes a housing (1), a radio frequency signal transmission component disposed within the housing (1), and a number of pins (2) spaced apart at the bottom of the housing (1). The housing (1) is mounted on a PCB board via the pins (2). The housing (1) has a height of 4.80±0.3mm, a length of 8.30±0.3mm, and a width of 6.4±0.3mm. The radio frequency signal transmission component includes 6 ports (3), of which two ports (3) are bidirectional input / output terminals, two ports (3) are bidirectional coupling / isolation terminals, and two ports (3) are ground terminals.

2. An RF coupler according to claim 1, characterized in that, The width of any of the aforementioned foot positions (2) is 1.02±0.3mm, the length is 1.72±0.3mm, and the distance between two adjacent foot positions (2) is 2.54mm±0.3mm.

3. An RF coupler according to claim 2, characterized in that, The number of the six pins (2) is six, and the six pins (2) correspond one-to-one with the six ports (3), and the six pins (2) are evenly spaced along the length of the housing (1).

4. An RF coupler according to claim 1, characterized in that, The radio frequency signal transmission component also includes a signal matching structure, which is electrically connected to the six ports (3). The signal matching structure is used to stabilize the coupling of the radio frequency signal in the 1-800MHz band when it is transmitted between the ports (3) at 18.5-21.8dB.

5. An RF coupler according to any one of claims 1-4, characterized in that, The housing (1) is made of high-temperature resistant insulating material, and the temperature resistance range of the high-temperature resistant insulating material is -55℃ to 100℃.

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