Antenna, tuning system, control method and telemetering monitoring equipment

Abstract

The invention provides an antenna, a tuning system, a control method and telemetering monitoring equipment. The antenna comprises a first substrate, and a first radiator, a second radiator, a third radiator, a fourth radiator and a bonding pad which are arranged on the first substrate, the first radiating body and the second radiating body are electromagnetically coupled to support a first communication frequency band, and the third radiating body and the fourth radiating body are electromagnetically coupled to support a second communication frequency band; the tuning system comprises the antenna, a radio frequency signal transceiving module and a matching module, wherein the radio frequency signal transceiving module is respectively connected with the antenna and the matching module; according to the control method of the tuning system, tuning is carried out according to preset matching data through detected sensor data and current communication frequency; the telemetering monitoring equipment comprises the tuning system. Reliable receiving and transmitting of radio frequency signals are guaranteed, the tuning matching module can be automatically adjusted according to the environment so as to adapt to the environmental influence, and the tuning efficiency is improved.

Description

Technical Field

[0001] The present invention relates to the technical field of antennas, and specifically relates to an antenna, a tuning system, a control method, and a telemetry monitoring device. Background Art

[0002] In existing wireless telemetry monitoring systems, the wireless transmission channel frequency bands of physiological signals are mainly divided into two categories: those higher than or lower than 1 gigahertz (GHz). Specifically, frequency bands higher than 1 GHz include 1.4 GHz, 2.4 GHz, etc.; while the frequency band lower than 1 GHz, i.e., the Sub-1 GHz band, covers frequency bands such as 608 MHz, 868 MHz, etc.

[0003] In practical applications, these frequency bands have their own advantages and disadvantages. The frequency band higher than 1 GHz has the advantage of a smaller antenna, but its signal attenuation is large and its penetration ability is weak. In contrast, frequency bands such as 174 MHz, 407 MHz, 608 MHz, and 868 MHz in the Sub-1 GHz band have stronger penetration ability and smaller signal attenuation.

[0004] Therefore, on the premise of complying with local radio-related regulations, wireless telemetry systems usually select the Sub-1 G band for transmitting physiological phenomenon data. However, the antennas of existing solutions often only support one Sub-1 G band, and the utilization of spectrum resources is restricted.

[0005] In addition, the influence of the environment where the antenna is located on the efficiency cannot be ignored. For example, when the telemetry transmitter box is worn on the human body or placed on a table, etc., the performance of the antenna will be significantly different. To address the above problems, the tuning and matching circuits adopted in the prior art are mainly based on combinations of LC circuits (the connection methods of the combinations include L-type, T-type connection methods, etc.), and the tunable antenna resonance matching is achieved by adjusting the values of the inductor L or the capacitor C. However, current automatic tuning schemes usually only make simple adjustments according to a single index such as the standing wave ratio or the phase difference, and it is difficult to cope with complex and changeable application environments. Summary of the Invention

[0006] The first object of the present invention is to provide an antenna that supports dual communication frequency bands.

[0007] The second object of the present invention is to provide an antenna tuning system that can adapt to a variety of application environments.

[0008] The third object of the present invention is to provide a control method for an antenna tuning system that improves the tuning efficiency.

[0009] The fourth object of the present invention is to provide a control method for an antenna tuning system that improves the tuning efficiency.

[0010] A fifth object of the present invention is to provide a telemetry monitoring device including the above antenna or antenna tuning system.

[0011] To achieve the above first object, an antenna provided by the present invention includes: a first substrate, and a first radiator, a second radiator, a third radiator, a fourth radiator, and a pad disposed on the first substrate; the first radiator and the second radiator support a first communication band through electromagnetic coupling, and the third radiator and the fourth radiator support a second communication band through electromagnetic coupling; the first radiator includes a first horizontal section, the second radiator includes a second horizontal section, a first vertical section, a third horizontal section, a second vertical section, and a fourth horizontal section, and the first horizontal section, the second horizontal section, the third horizontal section, and the fourth horizontal section are parallel; the right end of the first horizontal section extends downward to connect the right end of the second horizontal section, the left end of the second horizontal section connects the upper end of the first vertical section, the lower end of the first vertical section connects the left end of the third horizontal section, the right end of the third horizontal section connects the upper end of the second vertical section, the lower end of the second vertical section connects the right end of the fourth horizontal section, and the left end of the fourth horizontal section connects the pad; the third radiator includes a fifth horizontal section, the fourth radiator includes a sixth horizontal section, a third vertical section, and a seventh horizontal section, and the fifth horizontal section, the sixth horizontal section, and the seventh horizontal section are parallel; the left end of the sixth horizontal section connects the pad, the right end of the sixth horizontal section connects the upper end of the third vertical section, the lower end of the third vertical section connects the right end of the seventh horizontal section, and the left end of the seventh horizontal section extends downward to connect the left end of the fifth horizontal section. Further, the width of the first radiator is greater than the width of the second radiator, and the width of the third radiator is greater than the width of the fourth radiator.

[0012] Further, the width of the first radiator is greater than the width of the second radiator, and the width of the third radiator is greater than the width of the fourth radiator.

[0013] Further, the first substrate is an FPC substrate.

[0014] Further, the first radiator, the second radiator, the third radiator, and the fourth radiator are disposed on the main surface of the first substrate, and a double-sided adhesive is disposed on the back surface of the first substrate.

[0015] Further, the first communication band is 608 - 630 MHz, and the second communication band is 863 - 930 MHz.

[0016] Further, the total length of the first radiator is 49.657 mm, the width is 1.4 mm, the total length of the second radiator is 119.634 mm, the width is 1 mm, the total length of the third radiator is 10.35 mm, the width is 2.667 mm, and the total length of the fourth radiator is 80.503 mm, the width is 1 mm.

[0017] As can be seen from the above solution, the present invention supports the first communication frequency band by setting the first radiator and the second radiator, and supports the second communication frequency band by setting the second radiator and the third radiator. It can utilize more spectrum resources. Compared with the FPC antenna with a single 608 MHz frequency band or a single 868 MHz frequency band, it can realize the operation of the flexible circuit board antenna supporting two Sub-1G telemetry frequency bands (608 MHz and 868 MHz frequency bands), and has a small volume and a flexible installation method, which is very suitable for telemetry monitoring devices with limited space.

[0018] To achieve the above second object, an antenna tuning system includes: a matching module, a radio frequency signal transceiver module, and the above antenna; the matching module is respectively connected to the radio frequency signal transceiver module and the antenna.

[0019] As can be seen from the above solution, the antenna tuning system of the present invention can support good operation in two communication frequency bands simultaneously.

[0020] A further solution is that the antenna tuning system further includes a second substrate. The matching module and the radio frequency signal transceiver module are arranged on the second substrate, and the matching module and the antenna are connected by wires between the first substrate and the second substrate.

[0021] Thus, the antenna tuning system of the present invention is convenient for assembly during production and simplifies the overall structure.

[0022] A further solution is that the matching module includes a first capacitor, and the radio frequency signal transceiver module is connected to the antenna through the first capacitor.

[0023] Thus, it can maintain stable operation well in a static environment, with a compact overall structure, and is convenient to be applied in the telemetry monitoring device housing with a narrow space.

[0024] A further solution is that the antenna tuning system further includes an environment perception sensor unit and a processor. The environment perception sensor unit and the processor are arranged on the second substrate. The processor is respectively connected to the environment perception sensor unit and the matching module; the matching module includes a multiple-choice switch, a plurality of selection branches corresponding to the multiple output terminals of the multiple-choice switch one by one, a bias circuit, and a DC blocking capacitor. The two ends of the DC blocking capacitor are respectively connected to the radio frequency signal transceiver module and the plurality of selection branches. The control terminal of the multiple-choice switch and the bias circuit are respectively connected to the processor, and the input terminal of the multiple-choice switch is connected to the antenna.

[0025] Thus, a circuit for dynamic matching tuning can be realized, which can ensure that the influence can be offset as much as possible when the surrounding environment changes (especially when the wearing posture changes), and the efficiency is improved.

[0026] A further solution is that the antenna tuning system further includes a standing wave ratio sensor unit, which is connected to the processor. The standing wave ratio sensor unit is used to detect the forward wave and the reverse wave between the radio frequency signal transceiver module and the matching module to determine the standing wave ratio.

[0027] Thus, the tuning performance can be further improved.

[0028] To achieve the above-mentioned third object, the present invention provides a control method for an antenna tuning system, which applies the above-mentioned processor and includes the following steps: determining a first current communication frequency; determining a first current communication band according to the first current communication frequency; reading first sensor data of the environmental perception sensor unit; determining corresponding first matching data according to the first sensor data; and outputting a first control signal to the matching module according to the first matching data.

[0029] Thus, by adjusting the matching module according to the pre-set matching data, the overall adjustment efficiency can be improved.

[0030] To achieve the above-mentioned fourth object, the present invention provides a control method for an antenna tuning system, which is applied to the above-mentioned processor and includes the following steps: determining a second current communication frequency; determining a second current communication band according to the second current communication frequency; reading second sensor data of the environmental perception sensor unit; determining corresponding second matching data according to the second sensor data; outputting a second control signal to the multiple-choice switch according to the second matching data; determining a first current standing wave ratio according to the standing wave ratio sensor unit, and judging whether the first current standing wave ratio meets the preset requirements. If so, the matching ends; when the first current standing wave ratio meets the preset requirements, outputting a third control signal to the bias circuit according to the second matching data, and determining a second current standing wave ratio according to the standing wave ratio sensor unit; judging whether the second current standing wave ratio meets the preset requirements. If so, the matching ends, and if not, adjusting the multiple-choice switch or the bias circuit according to the judgment result of whether the third current communication frequency exceeds the boundary of the fine-tuning range.

[0031] Thus, by adjusting the matching module according to the pre-set matching data, the overall adjustment efficiency is improved, and the adjustment performance is further improved by determining the standing wave ratio.

[0032] To achieve the above-mentioned fifth object, the present invention provides a telemetry monitoring device, including a housing, wherein: the housing includes the above-mentioned antenna or antenna tuning system. Description of the Drawings

[0033] Figure 1 It is a structural diagram of an antenna embodiment of the present invention.

[0034] Figure 2 It is a structural framework diagram of the first embodiment of the antenna tuning system of the present invention.

[0035] Figure 3 This is another structural framework diagram of the first embodiment of the antenna tuning system of the present invention.

[0036] Figure 4 This is the circuit diagram of the matching module of the first embodiment of the antenna tuning system of the present invention.

[0037] Figure 5 This is the circuit diagram of the matching module of the third embodiment of the antenna tuning system of the present invention.

[0038] Figure 6 This is the flowchart of the first embodiment of the control method of the antenna tuning system of the present invention.

[0039] Figure 7 This is the flowchart of the second embodiment of the control method of the antenna tuning system of the present invention.

[0040] The present invention will be further described below with reference to the accompanying drawings and embodiments. Specific embodiments

[0041] The antenna of the present invention can support two different communication frequency bands simultaneously, thus ensuring sufficient communication distance and transmission reliability in the required environment. This antenna is applied in the antenna tuning system of the present invention. Combined with the radio frequency signal transceiver module and the matching module, it can achieve good reception and transmission of radio frequency signals. After further combining with the sensor module, it can automatically adjust the tuning matching module according to the environment to adapt to environmental impacts and ensure the communication efficiency of actual applications. Based on the above antenna tuning system, the present invention also provides a highly efficient control method. The present invention also provides a telemetry monitoring device including the above antenna or antenna tuning system.

[0042] It should be noted that the following "first", "second", "third", "fourth", "fifth" are used to distinguish similar things and do not have a relationship of sequence.

[0043] Antenna embodiment:

[0044] Refer to Figure 1 , the antenna of this embodiment includes a first substrate 20, and a first radiator, a second radiator, a third radiator, a fourth radiator, and a pad 207 disposed on the first substrate 20. This embodiment realizes dual-band communication through a branch antenna. Among them, the first radiator is coupled with the second radiator as a branch for realizing the first communication frequency band, and the third radiator is coupled with the fourth radiator as a branch for realizing the second communication frequency band.

[0045] The first radiator includes a first horizontal segment 201. The second radiator includes a second horizontal segment 202, a first vertical segment 203, a third horizontal segment 204, a second vertical segment 205, and a fourth horizontal segment 206. The first horizontal segment 201, the second horizontal segment 202, the third horizontal segment 204, and the fourth horizontal segment 206 are parallel. The right end of the first horizontal segment 201 extends downward to connect to the right end of the second horizontal segment 202. The left end of the second horizontal segment 202 is connected to the upper end of the first vertical segment 203. The lower end of the first vertical segment 203 is connected to the left end of the third horizontal segment 204. The right end of the third horizontal segment 204 is connected to the upper end of the second vertical segment 205. The lower end of the second vertical segment 205 is connected to the right end of the fourth horizontal segment 206. The left end of the fourth horizontal segment 206 is connected to the pad 207.

[0046] The third radiator includes a fifth horizontal segment 208. The fourth radiator includes a sixth horizontal segment 209, a third vertical segment 210, and a seventh horizontal segment 211. The fifth horizontal segment 208, the sixth horizontal segment 209, and the seventh horizontal segment 211 are parallel. The left end of the sixth horizontal segment 209 is connected to the pad 207. The right end of the sixth horizontal segment 209 is connected to the upper end of the third vertical segment 210. The lower end of the third vertical segment 210 is connected to the right end of the seventh horizontal segment 211. The left end of the seventh horizontal segment 211 extends downward to connect to the left end of the fifth horizontal segment 208.

[0047] In this embodiment, the first communication frequency band supported by electromagnetic coupling between the first radiator and the second radiator is 608 - 630 MHz, and the second communication frequency band supported by electromagnetic coupling between the second radiator and the third radiator is 863 - 930 MHz, which are different Sub-1 GHz frequency bands.

[0048] The dimensions of the antenna are shown in Table 1 below:

[0049] Table 1. Antenna Dimensions

[0050]

[0051] See Figure 1 And the above Table 1, the width of the first radiator is greater than that of the second radiator, and the width of the third radiator is greater than that of the fourth radiator, that is, the first radiator is thicker than the second radiator, and the third radiator is thicker than the fourth radiator, so as to ensure sufficient working bandwidth for the first communication segment and the second communication frequency band and reduce the overall size.

[0052] Since the maximum RF transmission power of the telemetry and monitoring equipment to which the antenna of this embodiment is applied is generally not high (generally ranging from 10 - 27 dBm in different frequency bands), the thickness of these traces and pads generally uses 0.5 Oz (i.e., 17.5 μm) during production.

[0053] Since the antenna in this embodiment is generally disposed in a telemetry monitoring device with a relatively compact internal structure, and each radiator of the antenna is relatively close to other conductors (such as a possible screen, switch, NFC module) inside the telemetry monitoring device, due to the existence of the capacitance effect, the distributed capacitance is increased. Therefore, the lengths of the first radiator and the third radiator are not fixed values. According to the actual operating frequency band, the lengths of the first radiator and the third radiator can be lengthened as much as possible first, and then trimmed appropriately according to the measurement of a vector network analyzer (VNA) until the point with the lowest standing wave ratio (SWR) is at the center frequency of the required communication frequency band. Then, the final radiator lengths are determined. After fixing the radiator lengths, mass production can be carried out in combination with subsequent processes.

[0054] In this embodiment, the first substrate 20 is an FPC (Flexible Printed Circuit) substrate, and the FPC substrate can be designed with double-sided wiring or single-sided wiring. The FPC substrate of this embodiment is a single-sided board, and the first radiator, the second radiator, the third radiator, the fourth radiator, and the pads are disposed on the same layer, without the need for "windowing" to expose the traces. The pad 207 is designed without a via. The surface on which the first radiator, the second radiator, the third radiator, and the fourth radiator are disposed is referred to as the main surface of the FPC substrate, and a double-sided adhesive is provided on the back surface opposite to the main surface, and the antenna is flexibly mounted at a suitable position inside the housing of the telemetry monitoring device through the double-sided adhesive.

[0055] It can be understood that in different embodiments, the FPC substrate can also be a double-sided board, the first radiator and the second radiator are designed on the same layer, the third radiator and the fourth radiator are designed on another layer, and the pad 207 is provided with a via.

[0056] It can be understood that in other embodiments, in order to achieve different first communication frequency bands, it can be realized by adjusting the total length and / or width of the first radiator and the second radiator. In order to achieve different second communication frequency bands, it can be realized by adjusting the total length and / or width of the third radiator and the fourth radiator.

[0057] It can be understood that in other embodiments, Figure 1 in the corner treatment of the traces, the rounded corner part can also be modified to a right-angle part.

[0058] First Embodiment of the Antenna Tuning System:

[0059] See Figure 2 , this embodiment includes a sensor module 11, a main control module 12, a radio frequency signal transceiver module 13, a matching module 14, and an antenna 2.

[0060] The sensor module 11 is connected to the main control module 12, the main control module 12 is connected to the matching module 14, the radio frequency signal collection module 13 is connected to the matching module 14, and the matching module 14 is connected to the antenna 2. Among them, the antenna 2 is the antenna in the above antenna embodiment.

[0061] See Figure 3 , the sensor module 11, the main control module 12, the radio frequency signal transceiver module 13, and the matching module 14 are arranged on the circuit board 1, and the matching module 14 is connected to the antenna 2 through the connection wire 3.

[0062] Among them, the connection wire can be a single-strand wire or a multi-strand wire, and in this embodiment, it is preferably a single-strand wire. The circuit board is a printed circuit board (PCB). For the mirror ground outside the radiator of the antenna 2, also called the antenna ground or the reference ground plane, the grounded copper-clad part of the circuit board 1 is directly used. The copper-clad part can be one of the inner layers of the circuit board 1, and this inner layer has the most complete ground plane.

[0063] In this embodiment, the sensor module 11 includes an environmental perception sensor unit, and the environmental perception sensor unit is used to detect environmental changes. The environmental perception sensor unit may specifically include a proximity sensor (including existing sensors such as a touch sensor and an infrared reflection sensor or a combination) to detect environmental changes outside the device where the antenna tuning system is located.

[0064] The main control module 12 includes a processor, and the processor is used to read the sensor data in the sensor module 11. Specifically, through the environmental perception sensor unit, it can sense which positions of the human body part or an object in the environment are close to or the antenna tuning system, and then determine the matching data, and adjust the matching module according to the matching data to ensure stable operation at the current communication frequency.

[0065] In this embodiment, the processor is a microcontroller unit (MCU), and in different embodiments, other existing processors can also be selected according to actual needs.

[0066] The matching data is the corresponding relationship between each frequency point in the first communication frequency band and the second communication frequency band, the data of each environmental perception sensor unit, and the matching combinations in the matching module. The matching combinations include the specific selection branch information in the multiplexer switch and / or the numerical information of the reverse voltage of each varactor diode. One frequency point and the data of one environmental perception sensor unit can correspond to one or more matching combinations. Thus, through the matching data, after the current communication frequency is determined and the sensor data of the environmental perception sensor unit is read, the matching combination in the matching module can be further determined, and the matching module is adjusted according to the matching combination. The matching data is obtained by measuring each frequency point and the sensor data using equipment such as a vector network analyzer during research and development and mass trial production, and through impedance matching measurement.

[0067] The matching module 11 is used to ensure that the impedance within the working communication bandwidth is as close as possible to 50 ohms, that is, the point or frequency band with the lowest standing wave ratio measured by a vector network analyzer, and to determine whether the standing wave ratio meets the preset requirements. In this embodiment, the preset requirement is specifically set to not be greater than 2.0.

[0068] Specifically, the matching module 11 includes a multi - select 1 switch, a plurality of selection branches corresponding to the multiple output terminals of the multi - select 1 switch, a bias circuit, and a DC - blocking capacitor. Under the control of the main control module 12, dynamic matching is achieved by adjusting the configuration circuit or the selection branch selected by the multi - select 1 switch.

[0069] See Figure 4 , in this embodiment, the multi - select 1 switch is a 4 - select 1 switch S2. The first selection branch corresponding to the first output terminal of the 4 - select 1 switch S2 includes a first varactor diode D1. The second selection branch corresponding to the second output terminal of the 4 - select 1 switch 2 includes a second varactor diode D2. The third selection branch corresponding to the third output terminal of the 4 - select 1 switch S2 includes a first inductor L1. There is no setting for the fourth selection branch corresponding to the fourth output terminal of the 4 - select 1 switch S1. The common ends of the first selection branch, the second selection branch, the third selection branch, and the fourth selection branch are connected to the ground terminal after being connected to a second inductor L2, and are also connected to the radio frequency signal transceiver module 13 through a DC - blocking capacitor C1. The DC - blocking capacitor C1 is used to isolate and filter the DC components existing in each varactor diode. The control terminal of the 4 - select 1 switch S2 is connected to the processor of the main control module 12 through a signal terminal "MCU". The input terminal of the 4 - select 1 switch S2 is connected to the antenna 2 through a signal terminal "ANT". The bias circuit includes a first resistor R1, a second capacitor C2, a third capacitor C3, and a third inductor L3, and obtains signals from the processor of the main control module 12 through a signal terminal "DAC" to adjust the reverse voltage of the first varactor diode D1 or the second varactor diode D2, so as to change the size of its junction capacitance.

[0070] In different embodiments, for the first communication frequency band and / or the second communication frequency band, for example, because the Wi - Fi HaLow protocol is used and set to some of its specified frequency bands, or 608 - 614 MHz specified by certain national standards, the specific settings of the matching module are also different. For example, multi - select 1 switches with different numbers of channels, different numbers of varactor diodes, etc.

[0071] Second embodiment of the antenna tuning system:

[0072] The difference between this embodiment and the first embodiment of the above antenna tuning system is that the sensor module 11 of this embodiment further includes a standing wave ratio sensor unit. The standing wave ratio sensor unit is used to detect the forward wave and the reverse wave between the RF signal transceiver module and the matching module to determine the standing wave ratio. The specific access method can be existing methods such as series or parallel connection. In this embodiment, the standing wave ratio is calculated by connecting the forward wave and the reverse wave to two ADC input terminals of the processor after rectification and filtering. By setting the standing wave ratio sensor unit, when the surrounding environment changes, the processor can adjust the matching module in combination with the measured standing wave ratio.

[0073] Third Embodiment of Antenna Tuning System:

[0074] The antenna tuning system of this embodiment includes an RF signal transceiver module, a matching module, and the antenna of the above antenna embodiment. The RF signal transceiver module is connected to the matching module, and the matching module is connected to the antenna, so as to realize the reception and transmission of RF signals.

[0075] See Figure 5 , the matching circuit includes a first capacitor C4, and both ends of the first capacitor C4 are respectively connected to the antenna and the RF signal transceiver module. By setting the first capacitor, certain parameter stability can be maintained in the static state.

[0076] First Embodiment of Control Method for Antenna Tuning System:

[0077] This embodiment is implemented based on the first embodiment of the above antenna tuning system. Specifically, when the surrounding environment changes, to ensure stable and good operation at the current communication frequency, see Figure 6 , the processor executes the following steps:

[0078] S11: Determine the first current communication frequency.

[0079] Wherein, the first current communication frequency refers to the communication frequency required for current communication with the outside.

[0080] S12: Determine the first current communication band according to the first current communication frequency.

[0081] Wherein, the first current communication band is the first communication band or the second communication band supported by the antenna.

[0082] S13: Read the first sensor data of the environmental perception sensor unit.

[0083] S14: Determine the first matching combination according to the first sensor data and the first current communication band.

[0084] S15: Output a first control signal to the multiplexer switch or the bias circuit according to the first matching combination.

[0085] Among them, the processor outputs a first control signal to the matching module, and the first control signal is used to select the selection branch of the four-way switch or adjust the bias circuit.

[0086] The second embodiment of the control method of the antenna tuning system:

[0087] This embodiment is implemented based on the second embodiment of the above antenna tuning system. Specifically, refer to Figure 7 , when the surrounding environment changes, for example, the position where the telemetry monitoring device where the antenna tuning system is worn or placed changes, causing the sensor data of the environmental perception sensor unit to change, or the communication frequency for external communication changes, or the value of the standing wave ratio changes, the processor is controlled by a set computer program. The processor includes the following steps:

[0088] S21: Determine the second current communication frequency.

[0089] S22: Determine the second current communication frequency band according to the second current communication frequency.

[0090] S23: Read the second sensor data of the environmental perception sensor.

[0091] S24: Determine the second matching combination according to the second sensor data and the second current communication segment.

[0092] S25: Output a second control signal to the multi-way switch according to the second matching combination.

[0093] Among them, the second control signal is used to switch the selection branch of the multi-way switch. Since the tuning range is large by switching the selection branch of the multi-way switch, it is called coarse tuning.

[0094] S26: Determine the first current standing wave ratio according to the standing wave ratio sensor unit.

[0095] S27: Determine whether the first current standing wave ratio meets the preset requirements.

[0096] Among them, the preset requirement is that the standing wave ratio is not greater than 2. If the first current standing wave ratio meets the preset requirements, it means that the current communication state is good after adjusting the selection branch selected by the multi-way switch, and the process ends; if the first current standing wave ratio does not meet the preset requirements, continue to execute step S28.

[0097] S28: Output a third control signal to the bias circuit according to the second matching combination.

[0098] Among them, the third control signal is used to adjust the reverse voltage of the varactor diode. Since the tuning range is small by adjusting the reverse voltage of the varactor diode, it is called fine tuning.

[0099] S29: Determine the second current standing wave ratio according to the standing wave ratio sensor unit.

[0100] S30: Determine whether the second current standing wave ratio meets the preset requirements.

[0101] If the second current standing wave ratio meets the preset requirements, it indicates that the communication state of the adjustment bias circuit is good and can adapt to environmental changes, and the process ends; if the second current standing wave ratio does not meet the preset requirements, step S31 is continued to be executed.

[0102] S31: Determine whether the third current communication frequency exceeds the fine-tuning range boundary.

[0103] Among them, the third current communication frequency is the current communication frequency after adjusting the bias circuit. According to the judgment result of step S31, it can be determined whether to select a branch of the multi-select switch or adjust the matching circuit next. If the judgment result of step S31 is yes, it indicates that the fine-tuning range boundary has been exceeded, and then return to step S31 for coarse tuning. If the judgment result of step S31 is no, it indicates that the preset fine-tuning range boundary has not been exceeded, and then return to step S28 for fine tuning. The fine-tuning range boundary is preset and is set according to the communication frequency range that can be achieved by adjusting the reverse voltage of the varactor diode.

[0104] Thus, through several times of coarse tuning and / or fine tuning, the antenna resonance frequency can be dynamically adjusted to stably operate at the current communication frequency and adapt to environmental changes.

[0105] In different embodiments, the radio frequency signal transceiver module of the antenna tuning system has a processor inside. For example, some radio frequency transceiver chips come with an MCU (for example, the core of ARM cortex-M) inside, so as to select whether to set a main control module separately. Then, some or all of the steps of the first embodiment or the second embodiment of the above control method can be executed by the processor inside the radio frequency signal transceiver module.

[0106] Embodiment of the telemetry and monitoring device:

[0107] The telemetry and monitoring device of this embodiment includes a housing, and the antenna tuning system of the above embodiment is arranged inside the housing. In addition, the sensor module 11 further includes a touch screen sensor (such as a capacitive screen) and corresponding peripheral components, providing an operation interface and a display interface.

[0108] In some other embodiments, the sensor module 11 further includes a body parameter sensor unit (such as blood pressure, temperature and other sensors) and corresponding peripheral components, so as to send these body parameters out through the antenna 2.

[0109] Finally, it should be emphasized that the above description is only the preferred embodiment of the present invention and is not intended to limit the present invention. For those skilled in the art, the present invention can have various changes and modifications. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included within the protection scope of the present invention.

Claims

1. An antenna, characterized in that, Comprising: A first substrate, and a first radiator, a second radiator, a third radiator, a fourth radiator, and a pad disposed on the first substrate; electromagnetic coupling exists between the first radiator and the second radiator to support a first communication band, and electromagnetic coupling exists between the third radiator and the fourth radiator to support a second communication band; The first radiator includes a first horizontal section, the second radiator includes a second horizontal section, a first vertical section, a third horizontal section, a second vertical section, and a fourth horizontal section, and the first horizontal section, the second horizontal section, the third horizontal section, and the fourth horizontal section are parallel; the right end of the first horizontal section extends downward to connect the right end of the second horizontal section, the left end of the second horizontal section connects to the upper end of the first vertical section, the lower end of the first vertical section connects to the left end of the third horizontal section, the right end of the third horizontal section connects to the upper end of the second vertical section, the lower end of the second vertical section connects to the right end of the fourth horizontal section, and the left end of the fourth horizontal section connects to the pad; The third radiator includes a fifth horizontal section, the fourth radiator includes a sixth horizontal section, a third vertical section, and a seventh horizontal section, and the fifth horizontal section, the sixth horizontal section, and the seventh horizontal section are parallel; the left end of the sixth horizontal section connects to the pad, the right end of the sixth horizontal section connects to the upper end of the third vertical section, the lower end of the third vertical section connects to the right end of the seventh horizontal section, and the left end of the seventh horizontal section extends downward to connect to the left end of the fifth horizontal section.

2. The antenna according to claim 1, wherein: The width of the first radiator is greater than the width of the second radiator, and the width of the third radiator is greater than the width of the fourth radiator.

3. The antenna according to claim 1, wherein: The first substrate is an FPC substrate.

4. The antenna according to claim 3, wherein: The first radiator, the second radiator, the third radiator, and the fourth radiator are disposed on the main surface of the first substrate, and a double-sided adhesive is disposed on the back surface of the first substrate.

5. The antenna according to any one of claims 1 to 4, wherein: The first communication band is 608 - 630 MHz, and the second communication band is 863 - 930 MHz.

6. The antenna according to claim 5, wherein: The total length of the first radiator is 49.657 millimeters, the width is 1.4 millimeters, the total length of the second radiator is 119.634 millimeters, the width is 1 millimeter, the total length of the third radiator is 10.35 millimeters, the width is 2.667 millimeters, and the total length of the fourth radiator is 80.503 millimeters, the width is 1 millimeter.

7. An antenna tuning system, characterized in that, Comprising: A matching module, a radio frequency signal transceiver module, and the antenna according to any one of claims 1 to 5; The matching module is respectively connected to the radio frequency signal transceiver module and the antenna.

8. The antenna tuning system according to claim 7, wherein Further comprising: A second substrate, wherein the matching module and the radio frequency signal transceiver module are disposed on the second substrate, and the matching module and the antenna are connected by wires between the first substrate and the second substrate.

9. The antenna tuning system according to claim 7, wherein: The matching module includes a first capacitor, and the radio frequency signal transceiver module is connected to the antenna through the first capacitor.

10. The antenna tuning system according to claim 8, wherein, It further includes: An environment perception sensor unit and a processor, the environment perception sensor unit and the processor are disposed on the second substrate, and the processor is respectively connected to the environment perception sensor unit and the matching module; The matching module includes a multiple-choice switch, a plurality of selection branches corresponding one by one to a plurality of output terminals of the multiple-choice switch, a bias circuit, and a DC blocking capacitor. Two ends of the DC blocking capacitor are respectively connected to the radio frequency signal transceiver module and the plurality of selection branches. A control end of the multiple-choice switch and the bias circuit are respectively connected to the processor, and an input end of the multiple-choice switch is connected to the antenna.

11. The antenna tuning system according to claim 10, characterized in that, It further includes: A standing wave ratio sensor unit, the standing wave ratio sensor unit is connected to the processor, and the standing wave ratio sensor unit is used to detect forward waves and reverse waves between the radio frequency signal transceiver module and the matching module to determine the standing wave ratio.

12. A control method for an antenna tuning system, applied to the processor according to claim 10, comprising the following steps: Determine a first current communication frequency; Determine a first current communication band according to the first current communication frequency; Read first sensor data of the environment perception sensor unit; Determine corresponding first matching data according to the first sensor data and the first current communication band; Output a first control signal to the matching module according to the first matching data.

13. A control method for an antenna tuning system, applied to the processor according to claim 11, comprising the following steps: Determine a second current communication frequency; Determine a second current communication band according to the second current communication frequency; Read second sensor data of the environment perception sensor unit; Determine corresponding second matching data according to the second sensor data; Output a second control signal to the multiple-choice switch according to the second matching data; Determine a first current standing wave ratio according to the standing wave ratio sensor unit, and judge whether the first current standing wave ratio meets a preset requirement. If so, end the matching; When the first current standing wave ratio meets the preset requirement, output a third control signal to the bias circuit according to the second matching data, and determine a second current standing wave ratio according to the standing wave ratio sensor unit; judge whether the second current standing wave ratio meets the preset requirement. If so, end the matching. If not, adjust the multiple-choice switch or the bias circuit according to a judgment result of whether the third current communication frequency exceeds a fine-tuning range boundary.

14. A telemetry and monitoring device, comprising a housing, wherein: The housing includes the antenna according to any one of claims 1 to 6, or includes the antenna tuning system according to any one of claims 7 to 11.

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