Antenna debugging circuit and debugging method of wearable equipment

Abstract

The invention provides an antenna debugging circuit and debugging method of wearable equipment, and the method comprises the steps: detecting a current network frequency band through a radio frequency main control chip of the wearable equipment; obtaining a target radio frequency port corresponding to the current network frequency band according to a pre-configured mapping relation between each network frequency band and each radio frequency port of the two antenna tuning switches; the target radio frequency port is controlled to be closed through a radio frequency main control chip of the wearable device; analyzing network parameters of the wearable device through a network analyzer, and adjusting an impedance element of the target radio frequency port according to an analysis result; the problem that the antenna of the small-size multi-radio-frequency-band wearable device is difficult to debug in the prior art can be solved.

Description

Technical Field

[0001] This application relates to the technical field of antenna tuning for electronic devices, and particularly to an antenna debugging circuit and method for wearable devices. Background Art

[0002] In the prior art, there are many small-sized wearable devices such as children's smartwatches. For example, the overall size of existing children's smartwatches is relatively small (such as 50mm * 40mm * 15mm). For the antenna debugging of such small-sized wearable devices, the difficulty is quite high, especially in the case of a relatively large number of radio frequency network frequency bands. Summary of the Invention

[0003] This application aims to at least solve one of the technical problems in the related art.

[0004] For this purpose, the first object of this application is to propose an antenna debugging circuit for wearable devices to solve the problem of difficult antenna debugging for small-sized wearable devices with multiple radio frequency bands in the related art.

[0005] The second object of this application is to propose an antenna debugging method for wearable devices.

[0006] To achieve the above object, an embodiment of the first aspect of this application proposes an antenna debugging circuit for wearable devices. The antenna debugging circuit includes two antenna tuning switches. The antenna tuning switch includes multiple radio frequency ports, multiple radio frequency port opening and closing control ends, and an antenna connection port. The multiple radio frequency ports are all connected to impedance elements. One or more of the multiple radio frequency port opening and closing control ends are connected to the radio frequency main control chip of the wearable device. The antenna connection port is connected to the antenna interface of the wearable device.

[0007] In some implementations, the model of the antenna tuning switch is MXD8544A.

[0008] In some implementations, the pin RFC of the antenna tuning switch is connected to the antenna interface of the wearable device through a resistor. The pins CTL1 and CTL2 of the antenna tuning switch are connected to the radio frequency main control chip of the wearable device. The pin CTL3 of the antenna tuning switch is grounded through a resistor.

[0009] In some implementations, the two antenna tuning switches include a first antenna tuning switch and a second antenna tuning switch, wherein pins CTL1 and CTL2 of the first antenna tuning switch are respectively connected to pins RFCTL4 and RFCTL3 of the RF main control chip of the wearable device, and pins CTL1 and CTL2 of the second antenna tuning switch are respectively connected to pins RFCTL5 and RFCTL6 of the RF main control chip of the wearable device; the RF ports of the first antenna tuning switch and the second antenna tuning switch work in conjunction to combine multiple states.

[0010] In some implementations, the plurality of radio frequency ports are all grounded via resistors.

[0011] In some implementations, the radio frequency main control chip of the wearable device is connected to the antenna interface through a resistor.

[0012] To achieve the above-mentioned purpose, a second embodiment of the present application provides an antenna debugging method for a wearable device, which is implemented by the antenna debugging circuit of the wearable device described in the first aspect above; the method includes:

[0013] Detecting the current network frequency band through the RF main control chip of the wearable device;

[0014] Obtaining a target radio frequency port corresponding to the current network frequency band according to a pre-configured mapping relationship between each network frequency band and each radio frequency port of the two antenna tuning switches;

[0015] Controlling the target radio frequency port to be closed by the radio frequency main control chip of the wearable device;

[0016] The network parameters of the wearable device are analyzed by a network analyzer, and the impedance element of the target radio frequency port is adjusted according to the analysis results.

[0017] The antenna debugging circuit and debugging method of the wearable device provided in this application have the following beneficial effects:

[0018] The RF main control chip controls the high and low levels of the RF port opening and closing control terminals of the two antenna tuning switches to control the opening or closing of multiple RF ports of the two antenna tuning switches. The multiple RF ports of the two antenna tuning switches can correspond to multiple RF network bands. Even if the two antenna tuning switches work in conjunction, multiple states can be combined to correspond to the impedance matching of multiple RF network bands, so that each RF network band can be individually debugged for RF signal impedance matching, that is, band-specific impedance matching can be achieved through two antenna tuning switches, which solves the problem of difficulty in antenna debugging of small-sized multi-RF band wearable devices and can achieve the best effect of antenna radiation or signal reception; it is suitable for antenna debugging of small-sized multi-RF band products.

[0019] Additional aspects and advantages of the present application will be given in part in the following description, become apparent in part from the following description, or be learned through the practice of the present application. Description of the Drawings

[0020] The above-mentioned and / or additional aspects and advantages of the present application will become apparent and be readily understood from the following description of embodiments in conjunction with the drawings, in which:

[0021] Figure 1 is the circuit diagram of the first antenna tuning switch provided by the embodiment of the present application;

[0022] Figure 2 is the circuit diagram of the second antenna tuning switch provided by the embodiment of the present application;

[0023] Figure 3 is the circuit diagram of the connection between the RF main control chip and the antenna interface of the wearable device provided by the embodiment of the present application;

[0024] Figure 4 is the flowchart of a method for antenna debugging of a wearable device provided by the embodiment of the present application. Detailed Embodiments

[0025] The embodiments of the present application will be described in detail below. Examples of the embodiments are shown in the drawings, where the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below by referring to the drawings are exemplary and intended to explain the present application, and should not be construed as a limitation to the present application.

[0026] To solve the problem of difficult antenna debugging for small-sized wearable devices such as children's smartwatches, the embodiments of the present application provide an antenna debugging circuit and a debugging method for a wearable device.

[0027] The antenna debugging circuit and debugging method for the wearable device according to the embodiments of the present application will be described below with reference to the drawings.

[0028] An antenna debugging circuit for a wearable device according to an embodiment of the present application includes two antenna tuning switches. The antenna tuning switch includes a plurality of RF ports, a plurality of RF port opening / closing control ends, and an antenna connection port. The plurality of RF ports are all connected to impedance elements. One or more of the plurality of RF port opening / closing control ends are connected to the RF main control chip of the wearable device, and the antenna connection port is connected to the antenna interface of the wearable device.

[0029] As an implementation, such as Figure 1 、 2As shown, the two antenna tuning switches include a first antenna tuning switch U0700 and a second antenna tuning switch U0002. The model of both antenna tuning switches is MXD8544A. The RFC (antenna pin) pins of both antenna tuning switches are connected to the antenna interface of the wearable device through resistors. The CTL1 and CTL2 pins of the antenna tuning switches are connected to the RF main control chip of the wearable device. The CTL3 pin of the antenna tuning switch is grounded through a resistor. The RF main control chip is an RF modem main control chip.

[0030] like Figure 1 As shown, the pin CTL1 and the pin CTL2 of the first antenna tuning switch are connected to the pin RFCTL4 and the pin RFCTL3 of the RF main control chip of the wearable device respectively. Figure 2 As shown, pins CTL1 and CTL2 of the second antenna tuning switch are connected to pins RFCTL5 and RFCTL6 of the wearable device's RF main control chip, respectively. Each antenna tuning switch has four RF ports, and the two antenna tuning switches have eight RF ports. By working in conjunction with the eight RF ports of the first and second antenna tuning switches, multiple states can be combined.

[0031] Before antenna debugging, multiple RF ports of the first antenna tuning switch and the second antenna tuning switch are grounded through resistors. As an example, during early circuit design, each RF port is grounded through a 0R resistor.

[0032] like Figure 3 As shown, the RF main control chip of the wearable device is connected to the antenna interface through a resistor, thereby the current network frequency band can be detected by the RF main control chip.

[0033] The antenna debugging circuit of the wearable device in the embodiment of the present application controls the high and low levels of the RF port opening and closing control ends of the two antenna tuning switches through the RF main control chip, and controls the opening or closing of multiple RF ports of the two antenna tuning switches. The multiple RF ports of the two antenna tuning switches can correspond to multiple RF network frequency bands. Even if the two antenna tuning switches work in conjunction, multiple states can be combined to correspond to the impedance matching of multiple RF network frequency bands, so that each RF network frequency band can be individually debugged for RF signal impedance matching, that is, band-specific impedance matching can be achieved through two antenna tuning switches, which solves the problem of difficulty in antenna debugging of small-sized multi-RF band wearable devices and can achieve the best effect of antenna radiation or receiving signals; it is suitable for antenna debugging of small-sized multi-RF band products.

[0034] Based on any of the above embodiments, an embodiment of the present application further provides an antenna debugging method for a wearable device, the method comprising the following steps:

[0035] Step S101, detect the current network frequency band through the RF main control chip of the wearable device.

[0036] Step S102, obtain the target RF port corresponding to the current network frequency band according to the mapping relationship between each network frequency band and each RF port of the two antenna tuning switches pre-configured.

[0037] Step S103, control the target RF port to close through the RF main control chip of the wearable device.

[0038] Step S104, analyze the network parameters of the wearable device through a network analyzer, and adjust the impedance elements of the target RF port according to the analysis results.

[0039] To clearly illustrate the above debugging method, it will be described below by way of examples.

[0040] As an example, it is detected through the RF main control chip of the wearable device that the current network frequency band is the B41 frequency band. According to the mapping relationship between each network frequency band and each RF port of the two antenna tuning switches pre-configured, it is determined that the target RF ports corresponding to the B41 frequency band include the RF port RF2 of the first antenna tuning switch and the RF port RF1 of the second antenna tuning switch; by controlling the levels of the pins CTL1 and CTL2 of the first antenna tuning switch and the first antenna tuning switch, the RF port RF2 of the first antenna tuning switch and the RF port RF1 of the second antenna tuning switch are closed; then in combination with the antenna body, the impedance matching of the B41 frequency band is debugged by using a network analyzer. The debugging result is that the resistance value of the resistor R1202 connected to the RF port RF2 of the first antenna tuning switch remains unchanged and is still the 0R resistor in the initial circuit design; the resistor R39 connected to the RF port RF1 of the second antenna tuning switch needs to be modified from a 0R resistor to a 1.2nH inductor. The debugging of other RF network frequency bands is similar and will not be listed one by one.

[0041] The antenna debugging method of the wearable device according to the embodiment of the present application performs antenna debugging on the wearable device with a small size and multiple radio frequency network bands through two antenna tuning switches. The wearable device controls the radio frequency ports of the two antenna tuning switches to switch the antenna to the current radio frequency network band according to the current network band, and adjusts the impedance elements of the radio frequency ports of this radio frequency network band to make the reactance components (inductance, capacitance) of the antenna match the radio frequency impedance of the radio frequency main control chip of the wearable device, thereby optimizing the transmission efficiency of radio frequency energy, enabling the antenna to be in the best state to improve the antenna performance, allowing the radio frequency energy of the radio frequency main control chip to be radiated as much as possible and the radio frequency main control chip to receive weaker radio frequency signals. The two antenna tuning switches can enable the antenna to play an important role under external influences such as free space, wrist mode (wearable device), and head-hand mode (phone answering state). The two antenna tuning switches can dynamically adjust the resonant network and switch combination, convert the complex antenna impedance into a matching load, and the core of the two antenna tuning switches is impedance transformation and dynamic feedback, which can achieve effective radiation and reception of the antenna. It is possible to achieve sub-band impedance matching through the two antenna tuning switches, solve the problem of antenna debugging difficulty for wearable devices with small size and multiple radio frequency bands, and achieve the best effect of antenna radiation or reception signal; it is applicable to antenna debugging of products with small size and multiple radio frequency bands.

[0042] In the description of the foregoing embodiments, the descriptions referring to terms such as "one embodiment", "some embodiments", "example", "specific example", or "some examples" mean that the specific features, structures, materials, or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of the present application. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials, or characteristics described can be combined in a suitable manner in any one or more embodiments or examples. In addition, without contradiction, those skilled in the art can combine and combine the different embodiments or examples described in this specification and the features of different embodiments or examples.

[0043] In addition, the terms "first" and "second" are only used for descriptive purposes and cannot be understood as indicating or implying relative importance or implicitly specifying the quantity of the indicated technical features. Thus, the features defined with "first" and "second" can explicitly or implicitly include at least one of the features. In the description of the present application, the meaning of "multiple" is at least two, such as two, three, etc., unless otherwise clearly and specifically defined.

[0044] Although the embodiments of the present application have been shown and described above, it can be understood that the above embodiments are exemplary and cannot be construed as limitations on the present application. Those of ordinary skill in the art can make changes, modifications, substitutions, and variations to the above embodiments within the scope of the present application.

Claims

1. An antenna debugging circuit for a wearable device, characterized in that: The antenna debugging circuit includes two antenna tuning switches, which include multiple RF ports, multiple RF port opening and closing control terminals and antenna connection ports. The multiple RF ports are all connected to impedance elements, one or more of the multiple RF port opening and closing control terminals are connected to the RF main control chip of the wearable device, and the antenna connection port is connected to the antenna interface of the wearable device.

2. The method according to claim 1, characterized in that The model of the antenna tuning switch is MXD8544A.

3. The method according to claim 2, characterized in that The pin RFC of the antenna tuning switch is connected to the antenna interface of the wearable device through a resistor, the pins CTL1 and CTL2 of the antenna tuning switch are connected to the RF main control chip of the wearable device, and the pin CTL3 of the antenna tuning switch is grounded through a resistor.

4. The method according to claim 2, characterized in that The two antenna tuning switches include a first antenna tuning switch and a second antenna tuning switch, wherein the pins CTL1 and CTL2 of the first antenna tuning switch are respectively connected to the pins RFCTL4 and RFCTL3 of the RF main control chip of the wearable device, and the pins CTL1 and CTL2 of the second antenna tuning switch are respectively connected to the pins RFCTL5 and RFCTL6 of the RF main control chip of the wearable device; the RF ports of the first antenna tuning switch and the second antenna tuning switch work in conjunction to combine multiple states.

5. The method according to claim 2, characterized in that The multiple radio frequency ports are all grounded through resistors.

6. The method according to claim 1, characterized in that The radio frequency main control chip of the wearable device is connected to the antenna interface through a resistor.

7. A method for debugging an antenna of a wearable device, characterized in that: The method is implemented by an antenna debugging circuit of a wearable device as described in any one of claims 1 to 6; the method includes: Detecting the current network frequency band through the RF main control chip of the wearable device; Obtaining a target radio frequency port corresponding to the current network frequency band according to a pre-configured mapping relationship between each network frequency band and each radio frequency port of the two antenna tuning switches; Controlling the target radio frequency port to be closed by the radio frequency main control chip of the wearable device; The network parameters of the wearable device are analyzed by a network analyzer, and the impedance element of the target radio frequency port is adjusted according to the analysis results.

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