Module, electronic equipment, mobile terminal, antenna circuit and adjusting method thereof

Abstract

The invention provides a module, an electronic device, a mobile terminal, an antenna circuit and an adjusting method thereof, a matching element and an initial component are connected in series or in parallel to an antenna port, the antenna circuit is connected to a first device in a preset working frequency band in the module through the antenna port, and the first device comprises at least one surface acoustic wave filter. The module further comprises a second device located in the target compatible frequency band, and the matching element enables the first device to be in a high-resistance state. According to the invention, the matching element is arranged at the antenna end, so that the filtering performance of the first device is maintained, and the carrier aggregation capability of the target frequency band is improved; meanwhile, the matching element is set to be an element with adjustable parameters, so that the antenna circuit is flexibly suitable for being compatible with different frequency bands; in addition, a standard is provided for the carrier aggregation effect of the module through the scattering coefficient of the device; and finally, matching the relationship between the Smith chart curve and the open circuit point to realize convenient and fast antenna circuit adjustment.

Description

Technical Field

[0001] The present invention belongs to the technical field of semiconductor integrated circuit manufacturing, and in particular relates to a module, electronic equipment, a mobile terminal, an antenna circuit and an adjustment method thereof. Background Art

[0002] As communication technology develops from 2G to 5G, the number of communication frequency bands has gradually increased (from 4 frequency bands in 2G to more than 50 frequency bands in 5G). In order to improve the compatibility of smartphones with different communication standards, the amount of filters required for 5G smartphones will increase significantly, driving large-scale growth in the filter market. The RF filter currently widely used in wireless communication terminals is the surface acoustic wave filter, which is responsible for filtering the RF signals in the receiving and transmitting channels and outputting signals of specific frequencies from the multiple input RF signals. At the same time, with the continuous development of mobile communication technology and the development of RF front-end modularization, the popularization of high-end applications has led to the demand for filters that are more complex, high-end, and miniaturized.

[0003] Currently, one of the key metrics for modular products across frequency bands is carrier aggregation (CA). For module devices, stronger CA capabilities mean less impact between frequency bands and better performance within each band.

[0004] Conventional technology typically achieves carrier aggregation by adjusting the filter structure and matching circuitry within a multi-band module. However, since adjustments to the filter structure and circuitry affect the filter's inherent resonant performance, it's difficult to achieve a balance between resonant performance and carrier aggregation capabilities. Furthermore, in devices that include surface acoustic wave filters, adjusting their matching circuitry significantly impacts resonant performance due to their inherently complex and sophisticated structure.

[0005] Therefore, there is an urgent need for a new module structure or method that can improve the carrier aggregation capability of a multi-band RF module while maintaining good resonance performance.

[0006] It should be noted that the above introduction to the technical background is only for the convenience of providing a clear and complete description of the technical solutions of this application and for the convenience of understanding by those skilled in the art. It cannot be considered that the above technical solutions are well known to those skilled in the art simply because these solutions are explained in the background technology part of this application. Summary of the Invention

[0007] In view of the above shortcomings of the prior art, the object of the present invention is to provide a module, electronic device, mobile terminal, antenna circuit and adjustment method thereof, which are used to solve the problem in the prior art that multi-band RF modules including surface acoustic wave filters cannot improve carrier aggregation capabilities while maintaining their resonant performance.

[0008] To achieve the above-mentioned objectives, the present invention provides an antenna circuit, comprising: an antenna port, an initial component, and a matching element, wherein the matching element is connected in series or in parallel with the initial component to the antenna port, and the antenna circuit is connected to a first device in a module in a preset operating frequency band through the antenna port, wherein the first device includes at least one surface acoustic wave filter, and the module also includes a second device in a target compatible frequency band, and the matching element causes the first device to be in a high-impedance state in the target compatible frequency band.

[0009] Optionally, the matching element is one or more capacitors or inductors.

[0010] Optionally, the matching element is a combined impedance topology network of capacitors and inductors.

[0011] Optionally, the matching element is an element with adjustable parameters.

[0012] Optionally, the amplitude of the scattering coefficient of the first component where the antenna circuit is located is greater than 0.95, and the phase of the scattering coefficient of the antenna circuit is -20 to +20.

[0013] The present invention also provides an antenna circuit, wherein the module includes a first device in a preset operating frequency band and a second device in a target compatible frequency band, the first device is connected to any one of the above-mentioned antenna circuits, and the first device includes at least one surface acoustic wave filter.

[0014] Optionally, the first device in the module is a duplexer.

[0015] The present invention further provides an electronic device, comprising any one of the above antenna circuits.

[0016] The present invention also provides a mobile terminal, comprising any one of the above antenna circuits.

[0017] The present invention further provides an antenna circuit adjustment method, the adjustment method being used to obtain any one of the antenna circuits described above, the adjustment method comprising:

[0018] Adjusting the first component in the module connected to the antenna circuit to a matching state of the preset operating frequency band;

[0019] Inputting the simulated circuit structure corresponding to the adjusted antenna circuit and the first component in the module into a preset simulation tool;

[0020] Connecting an adjustable capacitor and / or an adjustable inductor in parallel to the initial components of the antenna circuit in the simulation circuit structure, and setting the initial components to have adjustable inductance values;

[0021] Adjusting the parameter values ​​of the adjustable capacitor and / or the adjustable inductor, observing the Smith chart output by the simulation tool, and finding a position where the midpoint of the Smith chart curve of the simulated circuit structure is closest to the open circuit point in the Smith chart;

[0022] The parameter values ​​of the adjustable capacitor, the adjustable inductor, and the initial components obtained at this time are used as parameter values ​​in the antenna circuit.

[0023] As described above, the antenna circuit and adjustment method thereof, module, electronic device, and mobile terminal of the present invention have the following beneficial effects:

[0024] The present invention improves the carrier aggregation capability of the target frequency band while maintaining the filtering performance of the first device by arranging a matching element at the antenna end;

[0025] The present invention sets the matching element as a parameter-adjustable element, so that the antenna circuit is flexibly applicable to compatibility with different frequency bands;

[0026] The present invention provides a standard for the carrier aggregation effect of the module through the scattering coefficient of the device;

[0027] The present invention coordinates the relationship between the Smith chart curve and the open-circuit point to achieve convenient and rapid antenna circuit adjustment. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] Figure 1 It is a schematic diagram showing a structure in which the matching port of a duplexer in the prior art is only provided with initial components at the antenna port.

[0029] Figure 2 The Smith chart of a duplexer in the prior art is shown, in which only initial components are provided at the antenna port.

[0030] Figure 3 The diagram shows a matching port diagram of an antenna circuit in accordance with the first embodiment of the present invention, in which an antenna-end matching capacitor is provided.

[0031] Figure 4 Shown is a Smith chart of the first device for providing antenna-end matching capacitance in the first embodiment of the present invention.

[0032] Figure 5 The diagram shows a matching port diagram of an antenna circuit in accordance with the first embodiment of the present invention, in which an antenna-end matching inductor is provided.

[0033] Figure 6Shown is a Smith chart of the first device for providing antenna-end matching inductance in the first embodiment of the present invention.

[0034] Figure 7 It shows a schematic structural diagram of a duplexer provided with antenna-end matching inductors in the second embodiment of the present invention.

[0035] Figure 8 The figure shows a comparison between the Smith chart curve of the duplexer provided with antenna-end matching inductance in the second embodiment of the present invention and that in the prior art.

[0036] Figure 9 It shows a passband diagram of the TX branch of the duplexer provided with antenna-end matching inductance in the second embodiment of the present invention.

[0037] Figure 10 It is a schematic diagram showing the passband of the RX branch of the duplexer provided with the antenna-end matching inductor in the second embodiment of the present invention.

[0038] Figure 11 It shows a schematic diagram of the resonance curve of a duplexer provided with antenna-end matching inductance in the second embodiment of the present invention.

[0039] Component number description

[0040] L_TX transmitter matching inductor

[0041] L_RX receiving end matching inductor

[0042] L_ANT1 initial components

[0043] C_ANT Antenna end matching capacitor

[0044] L_ANT2 Antenna end matching inductor

[0045] L3-L6 branch matching inductor

[0046] S1-S7 series resonator

[0047] P1-P6 parallel resonator

[0048] F8-F16 Surface Acoustic Wave Resonators

[0049] O Antenna Port DETAILED DESCRIPTION

[0050] The following describes the embodiments of the present invention through specific examples. Those skilled in the art will readily understand the other advantages and benefits of the present invention from the disclosure herein. The present invention may also be implemented or applied through various other specific embodiments, and the details in this specification may be modified or altered based on different viewpoints and applications without departing from the spirit of the present invention.

[0051] For example, when describing the embodiments of the present invention, schematic diagrams illustrating device structures may be partially enlarged for ease of explanation. These schematic diagrams are merely illustrative and should not limit the scope of the present invention. Furthermore, in actual production, three-dimensional dimensions, including length, width, and depth, should be included.

[0052] For convenience of description, spatially relative terms such as "under," "below," "below," "below," "above," and "upper" may be used herein to describe the relationship of one element or feature to other elements or features shown in the drawings. It will be understood that these spatially relative terms are intended to encompass other orientations of the device in use or operation in addition to the orientation depicted in the drawings.

[0053] In the context of the present application, a structure described as a first feature being "above" a second feature may include embodiments where the first and second features are in direct contact, and may also include embodiments where additional features are formed between the first and second features, such that the first and second features may not be in direct contact.

[0054] It should be noted that the illustrations provided in this embodiment are only used to schematically illustrate the basic concept of the present invention. Therefore, the illustrations only show components related to the present invention and are not drawn according to the number, shape and size of components in actual implementation. In actual implementation, the type, quantity and proportion of each component can be changed at will, and the component layout type may also be more complicated.

[0055] Example 1:

[0056] The present invention provides an antenna circuit, comprising: an antenna port O, an initial component L_ANT1, and a matching element. The matching element is connected in series or in parallel with the initial component L_ANT1 to the antenna port O. The antenna circuit is connected to a first device in a module in a preset operating frequency band through the antenna port O. The first device includes at least one surface acoustic wave filter. The module also includes a second device in a target compatible frequency band. The matching element causes the first device to be in a high-impedance state.

[0057] In the prior art, the filter structure and matching circuit in the multi-band RF module are usually adjusted and matched, such as Figure 1The figure shows the matching ports of the duplexer in the prior art. The transmitter matching inductor L_TX and the receiver matching inductor L_RX are respectively set at the transmitter TX and the receiver RX. Only a single initial component L_ANT1 is set at the antenna end shared by TX and RX. In the prior art, the filters and matching circuits (not shown in the figure) connected to the TX and RX ports are usually set to adjust them separately. However, the operating parameters are complicated and the adjustment process is complex. Especially in the device with a surface acoustic wave filter, the adjustment parameters will be more complicated. Moreover, in a device including multiple branches like a duplexer, when adjusting the filter in the device to improve the compatibility with devices in other frequency bands, the filtering and matching performance of the device itself will be affected. It is difficult to achieve a balance between the performance of the device and the compatibility with the performance of other devices. Especially in the device with a surface acoustic wave filter, the adjustment of the parameters inside and around the branch has a more obvious effect on the matching parameters of the device, and the action rules are more complicated. Figure 1 The working frequency band of the device where the matching port is located is 20TX+2028RX band, such as Figure 2 Shown Figure 1 The Smith chart curve of the device in the target compatible frequency band band8 RX band is biased towards the short-circuit point, indicating that the device is in a low-impedance state in this target compatible frequency band. It can be seen that the compatibility between this device and the devices in the target compatible frequency band is poor, and the carrier aggregation capability is poor, making it difficult to adapt to current application scenarios for compatible use of multi-band signals.

[0058] By setting matching elements for the antenna circuit, the present invention can greatly improve the compatibility with the target frequency band without adjusting the filter or matching circuit in the device, thereby significantly improving the carrier aggregation capability in the module. At the same time, the matching elements for adjustment have a simple structure and are easy to adjust, which can greatly improve the adjustment efficiency.

[0059] In one embodiment, the matching element is one or more capacitors or inductors.

[0060] The present invention can achieve compatibility with the target frequency band by connecting a simple capacitor or inductor in parallel to the initial component L_ANT1 at the antenna port O. The structure is simple and the carrier aggregation capability is significantly improved.

[0061] In one embodiment, Figure 3 The figure shows an antenna circuit in which the matching element is an antenna end matching capacitor C_ANT and the matching element is connected in parallel with the initial component L_ANT1. Figure 1 The antenna circuit of the first device is the same as that of the first device. Its Smith chart curve in the target compatible frequency band band8 RX is as follows: Figure 4 As shown in Figure 2, it can be seen that although the curve still tends to the short-circuit point, the curve length is significantly shorter than Figure 2The length of the curve in shows that the convergence of the first device in the target compatible frequency band is enhanced after the antenna circuit is equipped with the antenna end matching capacitor C_ANT. Specifically, Figure 3 L_ANT1 is 15.1nH, C_ANT is 1.4pF, L_TX is 13.1nH, and L_RX is 11.1nH.

[0062] In one embodiment, Figure 5 The figure shows an antenna circuit in which the matching element is an antenna end matching inductor L_ANT2 and the matching element is connected in parallel with the initial component L_ANT1. Figure 1 The antenna circuit of the first device is the same as that of the first device. Its Smith chart curve in the target compatible frequency band band8 RX is as follows: Figure 6 As shown, it can be seen that the curve is in a high impedance state near the open point. It can be seen that the first device after the antenna circuit is equipped with the antenna end matching capacitor L_ANT2 has greatly improved the carrier aggregation capability within the target compatible frequency band and can meet the compatibility with the target compatible frequency band. Specifically, Figure 5 The L_ANT1 is 4.0nH, L_ANT2 is 15.0nH, L_TX is 11.7nH, and L_RX is 12.3nH.

[0063] In one embodiment, the matching element is a combined impedance topology network of capacitors and inductors.

[0064] In one embodiment, the matching element is an element with adjustable parameters.

[0065] The present invention sets the matching element as a parameter-adjustable element, so that the antenna circuit can be applied to be compatible with different target compatible frequency bands, thereby improving the adjustment efficiency and use flexibility of the antenna circuit.

[0066] In one embodiment, the amplitude of the scattering coefficient of the first component where the antenna circuit is located is greater than 0.95, and the phase of the scattering coefficient of the antenna circuit is -20 to +20.

[0067] The present invention determines the antenna circuit by setting the scattering coefficient range of the first device so that the first device meets the standard of achieving carrier aggregation capability for the target compatible frequency band, which is conducive to standard judgment of the carrier aggregation capability of the first device.

[0068] Example 2:

[0069] The present invention also provides an antenna circuit, wherein the module includes a first device in a preset operating frequency band and a second device in a target compatible frequency band, the first device is connected to the antenna circuit described in any one of the first embodiments, and the first device includes at least one surface acoustic wave filter.

[0070] In one embodiment, the first device in the module is a duplexer.

[0071] like Figure 7 The figure shows a duplexer connected to an antenna circuit. The initial component L_ANT1 in the antenna circuit is connected in parallel with the antenna-end matching inductor L_ANT2 and then connected to the duplexer through the antenna port O. The duplexer includes a receiving-end RX branch and a transmitting-end TX branch. The RX branch is provided with series resonators S1-S4, parallel resonators P1-P4, and branch matching inductors L3-L5 for filtering and matching. The TX branch is provided with a surface acoustic wave filter group F8-F16 and its surrounding series resonators S5-S7, parallel resonators P5-P6, and branch matching inductor L6 for filtering and matching. The Smith chart curve obtained by the first device of this embodiment in the target compatible frequency band is different from the Smith chart curve obtained by the device in the prior art in the target compatible frequency band in which only the initial component L_ANT1 is provided. Figure 8 As shown, the dotted line is the Smith chart curve of the device in the prior art, and the solid line is the Smith chart curve of the device in this embodiment. It can be seen that the Smith chart curve in this embodiment is near the open point, has strong compatibility with the target compatible frequency band, and has strong carrier aggregation capability; Figure 9-10 Schematic diagrams of the passband of the TX branch and the RX branch in the first device in this embodiment are shown. Figure 11 The figure shows a comparison of the overall resonance curves of the first device in this embodiment and the device in the prior art, where the dotted line is the resonance curve of the prior art, which is implemented as the resonance curve of this embodiment. It can be seen that the first device itself also achieves better resonance performance, achieving simultaneous optimization of resonance performance and carrier aggregation capability.

[0072] Example 3:

[0073] The present invention further provides an electronic device, comprising the antenna circuit described in any one of the first embodiments.

[0074] Example 4:

[0075] The present invention further provides a mobile terminal, comprising the antenna circuit described in any one of the first embodiments.

[0076] Embodiment 5:

[0077] The present invention further provides an adjustment method for an antenna circuit, the adjustment method being used to obtain the antenna circuit described in any one of the first embodiments, the preparation method comprising:

[0078] Step 1: Adjusting the first component in the module connected to the antenna circuit to a matching state of the preset operating frequency band;

[0079] Step 2: Inputting the simulated circuit structure corresponding to the adjusted antenna circuit and the first component in the module into a preset simulation tool;

[0080] Step 3: Connecting an adjustable capacitor and / or an adjustable inductor in parallel with the initial components of the antenna circuit in the simulation circuit structure, and setting the initial components to have adjustable inductance values;

[0081] Step 4: Adjust the parameter values ​​of the adjustable capacitor and / or the adjustable inductor, and observe the Smith chart output by the simulation tool until the midpoint of the Smith chart curve of the simulated circuit structure is closest to the open circuit point in the Smith chart;

[0082] Step 5: The parameter values ​​of the adjustable capacitor, the adjustable inductor, and the initial components obtained at this time are used as parameter values ​​in the antenna circuit.

[0083] It should be noted that the above sequence does not strictly represent the sequence of the preparation method protected by the present invention, and those skilled in the art may change it according to the actual preparation steps.

[0084] The present invention uses a preset simulation tool to set the matching element as an adjustable element for adjustment, thereby obtaining an antenna circuit in a simple and quick adjustment manner, thereby achieving simultaneous improvement in carrier aggregation capability and resonance performance.

[0085] In summary, the module, electronic device, mobile terminal, antenna circuit and adjustment method thereof of the present invention can improve the carrier aggregation capability of the target frequency band while maintaining the filtering performance of the first device by setting a matching element at the antenna end; at the same time, by setting the matching element as a parameter-adjustable element, the antenna circuit can be flexibly adapted to be compatible with different frequency bands; in addition, the scattering coefficient of the device is used to provide a standard for the carrier aggregation effect of the module; finally, by coordinating the relationship between the Smith chart curve and the open-circuit point, convenient and fast antenna circuit adjustment can be achieved.

[0086] Therefore, the present invention effectively overcomes various shortcomings of the prior art and has high industrial utilization value.

[0087] The above embodiments are merely illustrative of the principles and effects of the present invention and are not intended to limit the present invention. Anyone skilled in the art may modify or alter the above embodiments without departing from the spirit and scope of the present invention. Therefore, all equivalent modifications or alterations made by one of ordinary skill in the art without departing from the spirit and technical principles disclosed herein are intended to be covered by the claims of the present invention.

Claims

1. An antenna circuit, characterized in that: The antenna circuit includes: an antenna port, initial components and a matching element. The matching element is connected in series or in parallel with the initial components to the antenna port. The antenna circuit is connected to a first device in a module in a preset operating frequency band through the antenna port. The first device includes at least one surface acoustic wave filter. The module also includes a second device in a target compatible frequency band. The matching element puts the first device in a high-impedance state.

2. The antenna circuit according to claim 1, wherein: The matching element is one or more capacitors or inductors.

3. The antenna circuit according to claim 1, wherein: The matching element is a combined impedance topology network of capacitors and inductors.

4. The antenna circuit according to claim 1, wherein: The matching element is an element with adjustable parameters.

5. The antenna circuit according to claim 1, wherein: The amplitude of the scattering coefficient of the first component where the antenna circuit is located is greater than 0.95, and the phase of the scattering coefficient of the antenna circuit is -20 to +20.

6. A module, characterized in that: The module includes a first device in a preset operating frequency band and a second device in a target compatible frequency band, the first device is connected to the antenna circuit according to any one of claims 1 to 5, and the first device includes at least one surface acoustic wave filter.

7. The module according to claim 6, characterized in that: The first device in the module is a duplexer.

8. An electronic device, characterized in that: The electronic device comprises the antenna circuit according to any one of claims 1 to 5.

9. A mobile terminal, characterized in that: The mobile terminal comprises the antenna circuit according to any one of claims 1 to 5.

10. A method for adjusting an antenna circuit, characterized in that: The adjustment method is used to obtain the antenna circuit according to any one of claims 1 to 5, and the adjustment method is: Adjusting the first component in the module connected to the antenna circuit to a matching state of the preset operating frequency band; Inputting the simulated circuit structure corresponding to the adjusted antenna circuit and the first component in the module into a preset simulation tool; Connecting an adjustable capacitor and / or an adjustable inductor in parallel to the initial components of the antenna circuit in the simulation circuit structure, and setting the initial components to have adjustable inductance values; Adjusting the parameter values ​​of the adjustable capacitor and / or the adjustable inductor, observing the Smith chart output by the simulation tool, and finding a position where the midpoint of the Smith chart curve of the simulated circuit structure is closest to the open circuit point in the Smith chart; The parameter values ​​of the adjustable capacitor, the adjustable inductor, and the initial components obtained at this time are used as parameter values ​​in the antenna circuit.

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