Antenna circuit and mixer circuit

Abstract

The utility model discloses an antenna circuit and a mixer circuit, the antenna circuit comprises an antenna resonance circuit, the antenna resonance circuit comprises an antenna inductance module, the antenna inductance module comprises a first sub-antenna inductance module, the first sub-antenna inductance module comprises a first sub-antenna inductor and a second sub-antenna inductor, and the second sub-antenna inductor comprises a second sub-antenna inductor and a third sub-antenna inductor; the first sub-antenna inductor and the second sub-antenna inductor are arranged at a first included angle; and the capacitor module is connected with the antenna inductor module in series or in parallel. According to the utility model, the long-wave time service signal can be well captured, the receiving performance is improved, and the receiving frequency point selectivity is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of timing signal receiving circuits, in particular to an antenna circuit and a frequency mixing circuit. Background Art

[0002] Common smart devices are generally based on pulses generated by quartz crystal oscillators, which are combined with the binary counter of the microcontroller to count pulses to form the system clock. Temperature-compensated crystal oscillators, silicon semiconductors, ceramics, or simple RC oscillators generally have low clock accuracy and are greatly affected by ambient temperature. If used, complex temperature compensation circuits must be designed. Large-scale mass production requires manual or laser precision adjustment to ensure high product performance consistency.

[0003] In order to obtain a clock with higher precision, a common method is to use an existing accurate clock such as an atomic clock as a reference, and intermittently adjust the above-mentioned low-precision local real-time clock source RTC through wireless or wired transmission.

[0004] The only commercially available accurate timing methods are satellite long- and short-wave Internet, Internet NTP network timing services, and long- and short-wave timing stations.

[0005] Considering the cost and pricing of some IoT applications, low-cost microcontrollers often lack the modules required for these timing methods, making it impossible to use the corresponding timing services. To achieve highly accurate clocks at a very low cost, specially designed long-wave timing signal receiving circuits are required to intermittently adjust the local RTC. This allows smart IoT devices to maintain extremely accurate clock operation at a very low cost. Therefore, there is an urgent need for clock circuits, electronic devices, and chips that can achieve this goal at a very low cost.

[0006] Therefore, there is an urgent need for an antenna circuit that can well capture long-wave timing signals, and a mixing circuit that can improve reception performance and improve reception frequency selectivity. Summary of the Invention

[0007] The purpose of the utility model is to provide an antenna circuit capable of well capturing long-wave timing signals and a mixing circuit for improving the selectivity of receiving frequency points.

[0008] In order to achieve the above purpose, the technical solution provided by the present invention is:

[0009] In a first aspect, the present invention provides a technical solution that provides: an antenna circuit, including an antenna resonant circuit, characterized in that the antenna resonant circuit includes:

[0010] The antenna inductor module includes a first sub-antenna inductor module, wherein the first sub-antenna inductor module includes a first sub-antenna inductor and a second sub-antenna inductor, and the first sub-antenna inductor and the second sub-antenna inductor are arranged at a first angle;

[0011] A capacitor module is connected in series or in parallel with the antenna inductor module.

[0012] The first angle ranges from 20 to 80 degrees.

[0013] The first angle ranges from 30 to 70 degrees.

[0014] The first sub-antenna inductor and the second sub-antenna inductor are both coils wound on a rod-shaped structure, and the proximal end of the second sub-antenna inductor is close to the proximal end of the first sub-antenna inductor to form the first angle

[0015] The antenna inductor module further includes a second sub-antenna inductor module. The second sub-antenna inductor module includes a third sub-antenna inductor. The third sub-antenna inductor is arranged at a second angle to the second sub-antenna inductor.

[0016] The third sub-antenna inductor is a coil wound on a rod-shaped structure, and the proximal end of the third sub-antenna inductor is close to the proximal end of the second sub-antenna inductor to form the second angle.

[0017] The second angle ranges from 20 to 180 degrees.

[0018] The second sub-antenna inductor module further includes a fourth sub-antenna inductor, and the fourth sub-antenna inductor is arranged at a third angle to the third sub-antenna inductor.

[0019] The fourth sub-antenna inductor is a coil wound on a rod-shaped structure, and the proximal end of the fourth sub-antenna inductor is close to the proximal end of the third sub-antenna inductor to form the third included angle.

[0020] The third angle has a value range of 20 to 80 degrees.

[0021] The third angle has a value range of 30 to 70 degrees.

[0022] It also includes an amplifier circuit, which amplifies the resonance signal generated by the antenna resonance circuit and outputs the amplified signal.

[0023] The amplifier circuit includes a first-stage amplifier circuit and a second-stage amplifier circuit, and the first-stage amplifier circuit and the second-stage amplifier circuit are respectively a first transistor and a second transistor, and the base of the first transistor forms the input end of the amplifier circuit and is connected to the output end of the antenna resonant circuit, the emitter of the first transistor is connected to the base of the second transistor, the emitter of the second transistor is grounded, and the collector of the second transistor forms the output end of the amplifier circuit.

[0024] The rod-like structure is a magnetic rod.

[0025] In order to achieve the above object, the present invention further provides a mixing circuit, comprising:

[0026] A local oscillator circuit, comprising: a PWM square wave signal generator and an integration circuit, wherein the PWM square wave signal generator is used to generate a PWM square wave, and the PWM square wave is integrated by the integration circuit to form a triangular function wave signal;

[0027] The antenna circuit is used to output a long-wave timing signal;

[0028] A frequency mixing module is provided in which the triangular function wave signal and the long-wave timing signal are mixed and a mixed signal is output.

[0029] The PWM square wave signal generator is a single chip microcomputer.

[0030] The integration circuit includes a first-stage RC circuit and a second-stage RC circuit, and the PWM square wave signal generator is sequentially connected to the first-stage RC circuit and the second-stage RC circuit;

[0031] The first-stage RC circuit includes a first resistor and a first capacitor connected in series, wherein the positive electrode of the first resistor is connected to the output terminal of the PWM square wave signal generator, the negative electrode of the first resistor is connected to the positive electrode of the first capacitor, and the negative electrode of the first capacitor is grounded;

[0032] The second-stage RC circuit includes a second resistor and a second capacitor connected in series, and the positive electrode of the second resistor is connected to the negative electrode of the first resistor, the negative electrode of the second resistor is connected to the positive electrode of the second capacitor, the negative electrode of the second capacitor is grounded, and the positive electrode of the second capacitor forms the output end of the integration circuit.

[0033] A third capacitor is also included, the output end of the integration circuit is connected to the positive electrode of the third capacitor, and the negative electrode of the third capacitor is connected to the mixing module.

[0034] Compared to the prior art, the antenna circuit and mixing circuit of the present invention feature an antenna inductor module comprising a first sub-antenna inductor module, which includes a first sub-antenna inductor and a second sub-antenna inductor, arranged at a first angle with the second sub-antenna inductor, and a capacitor module connected in series or in parallel with the antenna inductor module. This arrangement allows for better capture of long-wave timing signals and resonance formation; the mixing module also significantly improves frequency selectivity.

[0035] The present invention will become more clear through the following description in conjunction with the accompanying drawings, which are used to explain embodiments of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0036] Figure 1 Shown is a circuit principle module diagram of an embodiment of the antenna circuit of the present utility model.

[0037] Figure 2 Shown is a schematic diagram of the positional relationship between the first sub-antenna inductor and the second sub-antenna inductor of the present invention.

[0038] Figure 3 FIG. 1 is a schematic diagram of another embodiment of the sub-antenna inductor module of the present invention.

[0039] Figure 4 FIG2 is a schematic diagram showing the positional relationship among the third sub-antenna inductor, the first sub-antenna inductor and the second sub-antenna inductor of the present invention.

[0040] Figure 5 FIG. 1 is a schematic diagram of another embodiment of the sub-antenna inductor module of the present invention.

[0041] Figure 6 FIG. 1 is a schematic diagram showing the positional relationship between the fourth sub-antenna inductor and the remaining sub-antenna inductors of the present invention.

[0042] Figure 7 Shown is a circuit principle module diagram of the antenna circuit of the present utility model.

[0043] Figure 8 Shown is a circuit schematic diagram of the antenna circuit of the present utility model.

[0044] Figure 9 FIG. 1 is a schematic block diagram of a frequency mixing circuit according to an embodiment of the present invention. DETAILED DESCRIPTION

[0045] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the embodiments described are part of the embodiments of the present invention, not all of them. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts should fall within the scope of protection of the present invention.

[0046] It should be noted that similar reference numerals and letters denote similar items in the following drawings, and therefore, once an item is defined in one drawing, it does not need to be further defined or explained in subsequent drawings.

[0047] First, you need to understand long wave and timing systems:

[0048] Long waves (including ultra-long waves) refer to radio waves with frequencies below 300kHz and wavelengths between 1,000 and 10,000 meters. Long waves can propagate as either sky waves or ground waves. The long wave band has the strongest transmission capability and, of all bands, is best suited for propagation as ground waves around the Earth's curved surface. However, the maximum distance of ground waves does not exceed 3,000 to 4,000 kilometers. Therefore, sky waves are generally the primary mode of long wave propagation. They primarily propagate as ionospheric waves around the Earth's surface, with a range of several thousand to tens of thousands of kilometers. Furthermore, ground waves can also propagate at close ranges (within 200 to 300 kilometers). Long wave propagation is less affected by seasonal variations and is less susceptible to ionospheric disturbances. They are highly stable and do not produce sudden fluctuations in reception intensity or sudden communication interruptions.

[0049] The long-wave timing system is a timing method used by the National Time Service Center and is its dominant method. Using long-wave (low-frequency) transmission and calibration of time and frequency, it offers greater coverage and calibration accuracy than short-wave. The establishment of the long-wave timing system is of immense significance and has had a significant impact, directly improving my country's timing accuracy from milliseconds to microseconds. The fully automatic long-wave timing and frequency calibration receiver developed by the National Time Service Center is specifically designed for BPL signal reception.

[0050] China has established several high-precision timing systems with microsecond accuracy, including the BPL long-wave timing station (BPL). This station broadcasts high-precision long-wave time and frequency signals at a carrier frequency of 100 kHz daily. With a ground wave range of 1,000-2,000 kilometers, combined with ground and ground waves, it covers the entire land and coastal waters of China, achieving timing accuracy in the microsecond (millionth of a second). Its signals can extend across the entire land and coastal waters. The BPL long-wave timing system provides crucial timing services for many key industries in China. The signal accuracy of this station's broadcasts is ≤±1 microsecond. The carrier frequency is 100 kHz.

[0051] For some IoT applications, cost and pricing considerations preclude the use of microcontrollers with powerful computing power and the ability to configure Wi-Fi and Bluetooth modules. Consequently, low-cost microcontrollers are often the only viable option. However, these devices lack computing power and are unable to integrate Wi-Fi, Bluetooth, or Ethernet connections. They are unable to utilize the NTP network time protocol, nor are they able to utilize expensive satellite-based timing modules like GPS or Beidou. If the controlled object is to obtain a highly accurate clock at an extremely low cost, a specially designed long-wave timing signal receiving circuit can be used to intermittently adjust the local RTC. This allows for extremely precise clock operation in smart IoT devices at a very low cost.

[0052] The publication number is: CN116633327B, and the name is: Clock circuit, electronic equipment, and chip based on timing pulse timing. It is an invention patent obtained by the applicant on October 10, 2023. It can receive low-frequency timing codes issued by timing centers in various countries around the world, such as the timing codes of China, Germany, the United Kingdom, the United States, Japan and other countries. The received timing code is parsed by a single-chip microcomputer, and the local RTC clock is adjusted according to the time information obtained from the analysis to correct the local clock of the system. Since the present invention directly receives the reference time of the national time service center, it can ensure that the reference clock time of the Internet of Things device connected to the present invention has extremely high accuracy. In order to better receive the low-frequency timing codes issued by the above-mentioned national time service centers, the local RTC is intermittently adjusted by a specially designed long-wave timing signal receiving circuit, thereby realizing the local RTC and the smart Internet of Things devices connected thereto in an extremely accurate clock operation state at an extremely low cost.

[0053] Figure 1 Shown is a circuit principle module diagram of an embodiment of the antenna circuit of the present utility model.

[0054] Based on the above background, the technical solution provided by the present invention is: to provide an antenna circuit 1, including an antenna resonant circuit 10, wherein the antenna resonant circuit 10 includes:

[0055] The antenna inductor module 100 includes a first sub-antenna inductor module 101, wherein the first sub-antenna inductor module 101 includes a first sub-antenna inductor 1010 and a second sub-antenna inductor 1011, and the first sub-antenna inductor 1010 and the second sub-antenna inductor 1011 are arranged at a first angle;

[0056] The capacitor module 200 is connected in series or in parallel with the antenna inductor module 100 .

[0057] First, it's important to note that conventional antennas, due to their size, are not well suited for receiving longwave signals. Magnetic rod antennas are designed to receive electromagnetic waves, and are particularly advantageous for this purpose. Consisting of a ferrite rod and a coil winding, Magnetic rod antennas have a strong ability to absorb electromagnetic waves. This induces a relatively high high-frequency voltage within the coil winding, allowing them to amplify high-frequency signals. Therefore, when fabricated on a circuit board, Magnetic rod antennas can receive longwave signals within a very limited space, minimizing the size of the circuit board.

[0058] In integrated circuit radio chips, the input impedance is typically very high, reaching hundreds of kilo-ohms or even mega-ohms. This roughly translates to only requiring induced voltage, not induced current. This requirement can be satisfied by increasing the antenna's Q factor. Therefore, the integrated circuit radio chip can eliminate the need for a large, long magnetic rod antenna. Instead, the magnetic rod antenna can be made sufficiently small, with an increased Q factor. However, during product development, the applicant discovered that a single magnetic rod antenna still exhibits significant operational limitations due to factors such as the directionality of long-wave signals and the strength of electromagnetic induction. A more optimal approach is to use two magnetic rod antennas in combination, resulting in improved long-wave signal reception.

[0059] The antenna inductor module 100 of the present invention is preferably implemented using a magnetic rod antenna.

[0060] Figure 2 Shown is a schematic diagram of the positional relationship between the first sub-antenna inductor and the second sub-antenna inductor of the present invention.

[0061] In one embodiment, reference Figure 2 The positional relationship between the first sub-antenna inductor 1010 and the second sub-antenna inductor 1011 is that the two are arranged at a first angle, and the value range of the first angle is 20 to 80 degrees.

[0062] In one embodiment, in order to obtain a better capture effect of the long-wave timing signal, the value range of the first angle is 30 to 70 degrees.

[0063] During the product development and debugging process, the applicant discovered that the first angle of 20 to 80 degrees had an overall better signal capture capability than the angle of 0 to 20 degrees. 20 degrees can be considered a watershed. When the first angle is 80 degrees, the signal capture capability is the strongest. However, as the first angle gradually increases within the range of 20 to 80 degrees, the signal capture capability does not increase accordingly. Overall, when the first angle is in the range of 30 to 70 degrees, it can better utilize the space on the circuit board, effectively reduce the size of the circuit board, and ensure signal capture effectiveness.

[0064] In one embodiment, reference Figure 2 The first sub-antenna inductor 1010 and the second sub-antenna inductor 1011 are both coils wound on a rod-shaped structure, and the proximal end of the second sub-antenna inductor 1011 is close to the proximal end of the first sub-antenna inductor 1010 to form the first angle.

[0065] It should be noted that the end where the first sub-antenna inductor 1010 and the second sub-antenna inductor 1011 are close to each other is called the proximal end, and correspondingly, the other end where the first sub-antenna inductor 1010 and the second sub-antenna inductor 1011 are far away from each other is called the distal end.

[0066] It should be noted that the cross-sections of the first sub-antenna inductor 1010 and the second sub-antenna inductor 1011 may both be circular or square rod-shaped structures.

[0067] It should be noted that the rod-shaped structure is a magnetic rod.

[0068] In addition, the first sub-antenna inductor 1010 and the second sub-antenna inductor 1011 both have a rod-shaped structure, which means that the first sub-antenna inductor 1010 and the second sub-antenna inductor 1011 have a rod-shaped external structure, and the so-called "rod-shaped structure" means that the length direction of the sub-antenna inductor is much larger than the width direction.

[0069] Figure 3 FIG. 1 is a schematic diagram of another embodiment of the sub-antenna inductor module of the present invention.

[0070] Figure 4 FIG2 is a schematic diagram showing the positional relationship among the third sub-antenna inductor, the first sub-antenna inductor and the second sub-antenna inductor of the present invention.

[0071] refer to Figure 3In the illustrated embodiment, the antenna inductor module 100 includes a first sub-antenna inductor module 101, which includes a first sub-antenna inductor 1010 and a second sub-antenna inductor 1011, and also includes a second sub-antenna inductor module 102, which includes a third sub-antenna inductor 1020, and the third sub-antenna inductor 1020 is arranged at a second angle to the second sub-antenna inductor 1011.

[0072] The third sub-antenna inductor 1020 is a coil wound on a rod-shaped structure, and the proximal end of the third sub-antenna inductor 1020 is close to the proximal end of the second sub-antenna inductor 1011 to form the second angle.

[0073] refer to Figure 4 In the illustrated embodiment, the second angle ranges from 20 to 180 degrees.

[0074] Figure 5 FIG. 1 is a schematic diagram of another embodiment of the sub-antenna inductor module of the present invention.

[0075] Figure 6 FIG. 1 is a schematic diagram showing the positional relationship between the fourth sub-antenna inductor and the remaining sub-antenna inductors of the present invention.

[0076] refer to Figure 5 As shown, the antenna inductor module 100 includes a first sub-antenna inductor module 101, which includes a first sub-antenna inductor 1010 and a second sub-antenna inductor 1011; the antenna inductor module 100 also includes a second sub-antenna inductor module 102, which includes a third sub-antenna inductor 1020 and a fourth sub-antenna inductor 1021, and the fourth sub-antenna inductor 1201 is arranged at a third angle to the third sub-antenna inductor 1020.

[0077] In one embodiment, the fourth sub-antenna inductor 1021 is a coil wound on a rod-shaped structure, and the proximal end of the fourth sub-antenna inductor 1021 is close to the proximal end of the third sub-antenna inductor 1020 to form the third angle.

[0078] In one embodiment, the third angle ranges from 20 to 80 degrees.

[0079] In one embodiment, in order to obtain a better capture effect of the long-wave timing signal, the value range of the third angle is 30 to 70 degrees.

[0080] It should be noted that, among the first sub-antenna inductor 1010, the second sub-antenna inductor 1011, the third sub-antenna inductor 1020, and the fourth sub-antenna inductor 1021, the proximal end is the end where the sub-antenna inductors are close to each other, and the other end away from the proximal end is the distal end. The distal ends of the four sub-inductors extend outward in order to better capture timing signals from all directions.

[0081] Figure 7 Shown is a circuit principle module diagram of the antenna circuit of the present utility model.

[0082] Figure 8 Shown is a circuit schematic diagram of the antenna circuit of the present utility model.

[0083] refer to Figure 7 In the illustrated embodiment, the antenna circuit 1 includes an antenna resonant circuit 10 and an amplifier circuit 20 . The amplifier circuit 20 amplifies the resonant signal generated by the antenna resonant circuit and outputs the amplified signal.

[0084] refer to Figure 7 In the embodiment shown, the amplifier circuit 20 includes a first-stage amplifier circuit 21 and a second-stage amplifier circuit 22. Figure 8 In the illustrated embodiment, the first-stage amplifier circuit and the second-stage amplifier circuit are respectively a first transistor T1 and a second transistor T2, and the base of the first transistor T1 forms the input end of the amplifier circuit and is connected to the output end of the antenna resonant circuit 10, the emitter of the first transistor T1 is connected to the base of the second transistor T2, the emitter of the second transistor T2 is grounded, and the collector of the second transistor T2 forms the output end of the amplifier circuit 20.

[0085] Figure 8 In the embodiment shown, the antenna resonant circuit 10 is formed by an antenna inductor L1 and a capacitor C1 connected in series. The antenna inductor L1 is responsible for capturing the long-wave timing signal and forming a series resonance with the capacitor C1.

[0086] Specifically, Figure 8 In the illustrated embodiment, a resistor R1 is provided between the output end of the antenna resonant circuit 10 and the base of the first transistor T1. Resistor R1 adjusts the base voltage of the first transistor T1, ensuring conductivity between the base and emitter of the first transistor T1. Furthermore, a resistor R2 is provided between the emitter of the first transistor T1 and the base of the second transistor T2. This similarly enables better regulation of the base voltage of the second transistor T2.

[0087] It should be noted that Figure 8In the embodiment shown, the antenna inductor L1 is an exemplary antenna inductor. In order to better capture the long-wave timing signal, the single antenna inductor can be replaced by the aforementioned Figure 2 、 4 , the structural form of two antenna inductors, three antenna inductors or four antenna inductors shown in 6.

[0088] Figure 9 FIG. 1 is a schematic block diagram of a frequency mixing circuit according to an embodiment of the present invention.

[0089] refer to Figure 9 The present invention provides a mixing circuit 300, comprising:

[0090] A local oscillator circuit 30 includes a PWM square wave signal generator 301 and an integration circuit 302. The PWM square wave signal generator 301 is used to generate a PWM square wave, and the PWM square wave is integrated by the integration circuit 302 to form a triangular function wave signal.

[0091] Antenna circuit 1, the antenna circuit 1 is used to output a long-wave timing signal;

[0092] The frequency mixing module 2 mixes the triangular function wave signal and the long-wave timing signal, and outputs a mixed signal.

[0093] In one embodiment, the PWM square wave signal generator is a single chip microcomputer. Figure 8 In the embodiment shown, the single chip microcomputer 301a is an implementation of a PWM square wave signal generator. There are many options for implementing the PWM square wave signal generator, and a single chip microcomputer is one of the options.

[0094] refer to Figure 8 In the embodiment shown, the integration circuit includes a first-stage RC circuit 302a and a second-stage RC circuit 302b, and the single-chip microcomputer 301a is sequentially connected to the first-stage RC circuit 302a and the second-stage RC circuit 302b;

[0095] The first-stage RC circuit 302a includes a first resistor R15 and a first capacitor C9 connected in series, wherein the positive electrode of the first resistor R15 is connected to the output terminal of the single-chip microcomputer 301a, the negative electrode of the first resistor R15 is connected to the positive electrode of the first capacitor C9, and the negative electrode of the first capacitor C9 is grounded;

[0096] The second-stage RC circuit 302b includes a second resistor R14 and a second capacitor C8 connected in series, wherein the positive electrode of the second resistor R14 is connected to the negative electrode of the first resistor R15, the negative electrode of the second resistor R14 is connected to the positive electrode of the second capacitor C8, the negative electrode of the second capacitor C8 is grounded, and the positive electrode of the second capacitor C8 forms the output end of the integration circuit 302.

[0097] refer to Figure 8 , further comprising a third capacitor C7, the output end of the integration circuit 302 is connected to the positive electrode of the third capacitor C7, and the negative electrode of the third capacitor C7 is connected to the mixing module 2.

[0098] In the several embodiments provided in this application, it should be understood that the disclosed devices and methods can also be implemented in other ways. The device embodiments described above are merely illustrative. For example, the flowcharts and block diagrams in the accompanying drawings show the possible architectures, functions and operations of the devices, methods and computer program products according to multiple embodiments of the present invention. In this regard, each box in the flowchart or block diagram can represent a module, a program segment or a portion of code, and the module, program segment or a portion of code contains one or more executable instructions for implementing the specified logical function. It should also be noted that in some alternative implementations, the functions marked in the box can also occur in an order different from that marked in the accompanying drawings. For example, two consecutive boxes can actually be executed substantially in parallel, and they can sometimes be executed in the opposite order, depending on the functions involved. It should also be noted that each box in the block diagram and / or flowchart, and the combination of boxes in the block diagram and / or flowchart, can be implemented using a dedicated hardware-based system that performs the specified function or action, or can be implemented using a combination of dedicated hardware and computer instructions.

[0099] In addition, the functional modules in the various embodiments of the present invention may be integrated together to form an independent part, or each module may exist independently, or two or more modules may be integrated to form an independent part.

[0100] The foregoing description is merely a preferred embodiment of the present invention and is not intended to limit the present invention. Those skilled in the art will readily appreciate that various modifications and variations of the present invention are possible. Any modifications, equivalent substitutions, improvements, and the like made within the spirit and principles of the present invention are intended to be included within the scope of protection of the present invention. It should be noted that similar reference numerals and letters denote similar items in the following figures. Therefore, once an item is defined in one figure, it need not be further defined or explained in subsequent figures.

[0101] If the functions are implemented in the form of software function modules and sold or used as independent products, they can be stored in a computer-readable storage medium. Based on this understanding, the technical solution of the present invention, or the part that contributes to the prior art, or the part of the technical solution, can be embodied in the form of a software product. The computer software product is stored in a storage medium and includes several instructions for causing a computer device (which can be a personal computer, server, or network device, etc.) to perform all or part of the steps of the method described in each embodiment of the present invention. The aforementioned storage medium includes various media that can store program code, such as a USB flash drive, a mobile hard drive, a read-only memory (ROM), a random access memory (RAM), a magnetic disk, or an optical disk. It should be noted that, in this article, relational terms such as first and second are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any actual relationship or order between these entities or operations. For example, directional relationship terms such as left end, right end, upper end, and lower end only represent the directional relationship presented to us by the accompanying drawings, and do not necessarily require or imply any actual directional relationship between these entities or operations. Moreover, the terms "comprises," "comprising," or any other variations thereof are intended to encompass non-exclusive inclusion, such that a process, method, article, or apparatus that includes a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such process, method, article, or apparatus. In the absence of further limitations, an element defined by the phrase "comprising a ..." does not preclude the presence of additional identical elements in the process, method, article, or apparatus that includes the element.

[0102] The above description is merely a specific embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any modifications or substitutions that can be easily conceived by a person skilled in the art within the technical scope disclosed in the present invention should be included within the scope of protection of the present invention. Therefore, the scope of protection of the present invention should be based on the scope of protection of the claims.

Claims

1. An antenna circuit, comprising an antenna resonant circuit, characterized in that: The antenna resonant circuit comprises: An antenna inductor module, comprising a first sub-antenna inductor module, wherein the first sub-antenna inductor module comprises a first sub-antenna inductor and a second sub-antenna inductor, wherein the first sub-antenna inductor and the second sub-antenna inductor are arranged at a first angle, wherein a proximal end of the second sub-antenna inductor is close to a proximal end of the first sub-antenna inductor to form the first angle; A capacitor module is connected in series or in parallel with the antenna inductor module.

2. The antenna circuit according to claim 1, wherein: The first angle ranges from 20 to 80 degrees.

3. The antenna circuit according to claim 1 or 2, characterized in that: The first angle ranges from 30 to 70 degrees.

4. The antenna circuit according to claim 1, wherein: The first sub-antenna inductor and the second sub-antenna inductor are both coils wound on a rod-shaped structure, and the value range of the first included angle is 30 to 70 degrees.

5. The antenna circuit according to claim 1, wherein: The antenna inductor module further includes a second sub-antenna inductor module. The second sub-antenna inductor module includes a third sub-antenna inductor. The third sub-antenna inductor is arranged at a second angle to the second sub-antenna inductor.

6. The antenna circuit according to claim 5, wherein: The third sub-antenna inductor is a coil wound on a rod-shaped structure, and the proximal end of the third sub-antenna inductor is close to the proximal end of the second sub-antenna inductor to form the second angle.

7. The antenna circuit according to claim 5, wherein: The second angle ranges from 20 to 180 degrees.

8. The antenna circuit according to claim 5, wherein: The second sub-antenna inductor module further includes a fourth sub-antenna inductor, and the fourth sub-antenna inductor is arranged at a third angle to the third sub-antenna inductor.

9. The antenna circuit according to claim 8, wherein: The fourth sub-antenna inductor is a coil wound on a rod-shaped structure, and the proximal end of the fourth sub-antenna inductor is close to the proximal end of the third sub-antenna inductor to form the third included angle.

10. The antenna circuit according to claim 9, wherein: The third angle has a value range of 20 to 80 degrees.

11. The antenna circuit according to claim 9 or 10, characterized in that: The third angle has a value range of 30 to 70 degrees.

12. The antenna circuit according to claim 1, wherein: It also includes an amplifier circuit, which amplifies the resonance signal generated by the antenna resonance circuit and outputs the amplified signal.

13. The antenna circuit according to claim 12, wherein: The amplifier circuit includes a first-stage amplifier circuit and a second-stage amplifier circuit, and the first-stage amplifier circuit and the second-stage amplifier circuit are respectively a first transistor and a second transistor, and the base of the first transistor forms the input end of the amplifier circuit and is connected to the output end of the antenna resonant circuit, the emitter of the first transistor is connected to the base of the second transistor, the emitter of the second transistor is grounded, and the collector of the second transistor forms the output end of the amplifier circuit.

14. The antenna circuit according to any one of claims 4, 6, and 9, wherein: The rod-like structure is a magnetic rod.

15. A mixing circuit, characterized in that: include: A local oscillator circuit, comprising: a PWM square wave signal generator and an integration circuit, wherein the PWM square wave signal generator is used to generate a PWM square wave, and the PWM square wave is integrated by the integration circuit to form a triangular function wave signal; The antenna circuit according to claim 1, wherein the antenna circuit is used to output a long-wave timing signal; A frequency mixing module is provided in which the triangular function wave signal and the long-wave timing signal are mixed and a mixed signal is output.

16. The mixing circuit according to claim 15, wherein: The PWM square wave signal generator is a single chip microcomputer.

17. The mixing circuit according to claim 15, wherein: The integration circuit includes a first-stage RC circuit and a second-stage RC circuit, and the PWM square wave signal generator is sequentially connected to the first-stage RC circuit and the second-stage RC circuit; The first-stage RC circuit includes a first resistor and a first capacitor connected in series, wherein the positive electrode of the first resistor is connected to the output terminal of the PWM square wave signal generator, the negative electrode of the first resistor is connected to the positive electrode of the first capacitor, and the negative electrode of the first capacitor is grounded; The second-stage RC circuit includes a second resistor and a second capacitor connected in series, and the positive electrode of the second resistor is connected to the negative electrode of the first resistor, the negative electrode of the second resistor is connected to the positive electrode of the second capacitor, the negative electrode of the second capacitor is grounded, and the positive electrode of the second capacitor forms the output end of the integration circuit.

18. The mixer circuit according to any one of claims 15 to 17, wherein: A third capacitor is also included, the output end of the integration circuit is connected to the positive electrode of the third capacitor, and the negative electrode of the third capacitor is connected to the mixing module.

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