CN112532772B - Antenna tuning circuit, implementation method and mobile terminal - Google Patents
Antenna tuning circuit, implementation method and mobile terminal Download PDFInfo
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- CN112532772B CN112532772B CN202011323803.2A CN202011323803A CN112532772B CN 112532772 B CN112532772 B CN 112532772B CN 202011323803 A CN202011323803 A CN 202011323803A CN 112532772 B CN112532772 B CN 112532772B
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04M—TELEPHONIC COMMUNICATION
- H04M1/00—Substation equipment, e.g. for use by subscribers
- H04M1/02—Constructional features of telephone sets
- H04M1/0202—Portable telephone sets, e.g. cordless phones, mobile phones or bar type handsets
- H04M1/026—Details of the structure or mounting of specific components
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01Q—ANTENNAS, i.e. RADIO AERIALS
- H01Q1/00—Details of, or arrangements associated with, antennas
- H01Q1/50—Structural association of antennas with earthing switches, lead-in devices or lightning protectors
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01Q—ANTENNAS, i.e. RADIO AERIALS
- H01Q23/00—Antennas with active circuits or circuit elements integrated within them or attached to them
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B1/00—Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised by the medium used for transmission
- H04B1/06—Receivers
- H04B1/16—Circuits
- H04B1/18—Input circuits, e.g. for coupling to an antenna or a transmission line
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Abstract
The embodiment of the invention discloses an antenna tuning circuit, an implementation method and a mobile terminal, wherein the antenna tuning circuit comprises the following components: the antenna is used for receiving and transmitting antenna signals with a plurality of frequencies; the frequency tuning unit comprises a low-pass branch and a high-pass branch, the low-pass branch comprises a low-pass filter and at least one inductor, and the high-pass branch comprises a plurality of high-pass filters; a tuning node is arranged between the adjacent high-pass filters, the tuning node is used for being connected with the adjacent high-pass filters in series, and the low-pass branch is connected with the high-pass branch through the tuning node. According to the scheme, the antenna tuning circuit can be changed according to actual needs, and the frequency is further subdivided, so that the antenna tuning effect is better.
Description
Technical Field
The present invention relates to the field of communications technologies, and in particular, to an antenna tuning circuit, an implementation method, and a mobile terminal.
Background
The antenna tuning devices commonly used in the current mobile phone products are tuning switches and adjustable capacitors, and the two tuning devices can work only by an external power supply. When a tuning device is needed on an antenna small board (a small board which is independent of a main board and is simply used for welding an antenna elastic sheet and a matching circuit), the small board needs to be matched with an FPC (flexible printed circuit) and an FPC connector for use, and the FPC is used for conducting a circuit for supplying power to the tuning device. This adds undoubtedly to the cost. Meanwhile, a certain space is required for placing the FPC on the structure, and a series of problems such as assembly and the like are also required to be considered, so that great difficulty is caused to the structural design.
Thus, improvements are needed in the art.
Disclosure of Invention
The embodiment of the invention provides an antenna tuning circuit, an implementation method and a mobile terminal, which are used for subdividing frequency so as to achieve better antenna tuning effect.
An antenna tuning circuit provided by an embodiment of the present invention includes: the antenna is used for receiving and transmitting antenna signals with a plurality of frequencies; the frequency tuning unit comprises a low-pass branch and a high-pass branch, the low-pass branch comprises a low-pass filter and at least one inductor, the high-pass branch comprises a plurality of high-pass filters, each high-pass filter is provided with a preset high-pass frequency, the preset high-pass frequencies from an input end to an output end are sequentially increased, each low-pass filter is provided with a preset low-pass frequency, the preset low-pass frequencies from the input end to the output end are sequentially increased, the input end is connected with an antenna end, and the output end is connected with a feed source end; a tuning node is arranged between the adjacent high-pass filters, the tuning node is used for being connected with the adjacent high-pass filters in series, and the low-pass branch is connected with the high-pass branch through the tuning node.
Optionally, in some embodiments of the present invention, the frequency tuning unit is connected to the antenna, and the antenna is configured to receive and send antenna signals with multiple frequencies, including:
the frequency of the antenna signal is smaller than a first preset low-pass frequency, and the frequency tuning unit is a first low-pass branch;
the first low-pass branch is connected with an input end, the input end is connected with the antenna, and the first low-pass branch comprises the low-pass filter and the inductor.
Optionally, in some embodiments of the present invention, the frequency tuning unit is connected to the antenna, and the antenna is configured to receive and send antenna signals with multiple frequencies, including:
the frequency of the antenna signal is larger than a first preset high-pass frequency, and the frequency tuning unit is a first high-pass branch;
the first high-pass branch is connected with the output end, the output end is connected with the feed source, and the first high-pass branch comprises the high-pass filter.
Optionally, in some embodiments of the present invention, the high-pass branch includes a high-pass filter, including:
the high-pass filter with the minimum preset high-pass frequency is connected with the input end, and the high-pass filter with the maximum preset high-pass frequency is connected with the output end.
Optionally, in some embodiments of the present invention, a tuning node is disposed between the adjacent high-pass filters, the tuning node is used for concatenating the adjacent high-pass filters, and the low-pass branch is connected with the high-pass branch through the tuning node, including:
the plurality of tuning nodes are sequentially arranged from the input end to the output end, and preset low-pass frequencies of the plurality of low-pass filters connected with the tuning nodes are sequentially increased.
The embodiment of the invention provides a method for realizing an antenna tuning circuit, which comprises the following steps:
setting a frequency tuning unit, wherein the frequency tuning unit comprises a low-pass branch and a high-pass branch, the low-pass branch comprises a low-pass filter and at least one inductor, the high-pass branch comprises a plurality of high-pass filters, each high-pass filter is provided with a preset high-pass frequency, the preset high-pass frequencies from an input end to an output end are sequentially increased, each low-pass filter is provided with a preset low-pass frequency, the preset low-pass frequencies from the input end to the output end are sequentially increased, the input end is connected with an antenna end, and the output end is connected with a feed source end;
and setting a tuning node, wherein the tuning node is arranged between adjacent high-pass filters, the tuning node is connected with the adjacent high-pass filters in series, and the low-pass branch is connected with the high-pass branch through the tuning node.
Optionally, in some embodiments of the present invention, the setting frequency tuning unit includes:
setting the frequency tuning unit as a first low-pass branch;
the first low-pass branch is connected with an input end, the input end is connected with an antenna, and the first low-pass branch comprises the low-pass filter and the inductor.
Optionally, in some embodiments of the present invention, the setting frequency tuning unit includes:
setting the frequency tuning unit as a first high-pass branch;
the first high-pass branch is connected with the output end, the output end is connected with the feed source, and the first high-pass branch comprises the high-pass filter.
Correspondingly, the embodiment of the invention also provides a mobile terminal which comprises an antenna tuning circuit, wherein the antenna tuning circuit is any one of the antenna tuning circuits.
The antenna tuning circuit of the embodiment of the invention comprises: the antenna is used for receiving and transmitting antenna signals with a plurality of frequencies; the frequency tuning unit comprises a low-pass branch and a high-pass branch, the low-pass branch comprises a low-pass filter and at least one inductor, and the high-pass branch comprises a plurality of high-pass filters; and a tuning node is arranged between the adjacent high-pass filters and is used for connecting the adjacent high-pass filters in series, and the low-pass branch is connected with the high-pass branch through the tuning node. According to the scheme, the antenna tuning circuit can be changed according to actual needs, and the frequency is further subdivided, so that the antenna tuning effect is better.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings that are needed in the description of the embodiments will be briefly described below, it being obvious that the drawings in the following description are only some embodiments of the present invention, and that other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.
Fig. 1 is a schematic structural diagram of an antenna tuning circuit according to an embodiment of the present invention;
fig. 2 is a flow chart of a method for implementing an antenna tuning circuit according to an embodiment of the present invention;
fig. 3 is a schematic diagram of another antenna tuning circuit according to an embodiment of the present invention;
fig. 4 is a schematic structural diagram of a mobile terminal according to an embodiment of the present invention.
Detailed Description
The following description of the embodiments of the present invention will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present invention, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to fall within the scope of the invention.
The terms "first," "second," "third," "fourth," and the like in the description and in the drawings, if any, are used for distinguishing between similar objects and not necessarily for describing a particular sequential or chronological order. It is to be understood that the data so used may be interchanged where appropriate such that the embodiments of the invention described herein may be implemented in sequences other than those illustrated or otherwise described herein. Furthermore, the terms "comprises," "comprising," and "having," and any variations thereof, are intended to cover a non-exclusive inclusion, such that a process, method, system, article, or apparatus that comprises a list of steps or elements is not necessarily limited to those steps or elements expressly listed but may include other steps or elements not expressly listed or inherent to such process, method, article, or apparatus.
The embodiment of the invention provides an antenna tuning circuit, an implementation method and a mobile terminal. In the mobile terminal, the antenna tuning circuit provided by the embodiment of the invention can be a mobile phone, a tablet personal computer, a notebook personal computer and other devices. The mobile terminal provided with the antenna tuning circuit can communicate with a network device (e.g., a server) or other mobile terminals (e.g., a smart phone) through a wireless network to complete information transceiving with the network device or other mobile terminals.
Referring to fig. 1, as shown in fig. 1, an antenna tuning circuit provided in an embodiment of the present invention includes: an antenna 101, a frequency tuning unit, the frequency tuning unit being connected to the antenna 101, the antenna 101 being configured to transmit and receive antenna signals of a plurality of frequencies; the frequency tuning unit comprises a low-pass branch and a high-pass branch, the low-pass branch comprises a low-pass filter 104 and at least one inductor 105, and the high-pass branch comprises a plurality of high-pass filters 103; a tuning node 106 is arranged between the adjacent high-pass filters, the tuning node 106 is used for connecting the adjacent high-pass filters 103 in series, and the low-pass branch is connected with the high-pass branch through the tuning node 106. The inductors L1 to L4 are sequentially connected in series in the antenna tuning circuit.
The High-pass filter 103 (HPF), also called a low-cut filter or a low-resistance filter, is a filter that allows frequencies higher than a certain cut-off frequency to pass through, while greatly attenuating lower frequencies; a Low-pass filter 104 (LPF), also known as a high-frequency shear filter, a high-tone cancellation filter, is a filter that allows signals below the cut-off frequency to pass, but not above the cut-off frequency. In the embodiment of the invention, each high-pass filter is provided with a preset high-pass frequency, and each low-pass filter is provided with a preset low-pass frequency.
The high-pass branch circuit includes a plurality of high-pass filters 103, a plurality of preset high-pass filters with sequentially increased high-pass frequencies, a high-pass filter HPF1 with the minimum preset high-pass frequency is connected with an input end, a high-pass filter HPF4 with the maximum preset high-pass frequency is connected with an output end, the input end is connected with an antenna 101, and the output end is connected with a feed source 102. The low-pass branch includes a plurality of low-pass filters 104, a plurality of tuning nodes 106 are sequentially arranged from an input end to an output end, and preset low-pass frequencies of the plurality of low-pass filters 104 connected to the tuning nodes 106 are sequentially increased. As shown in fig. 1, the cut-off frequencies of the high pass filters HPF1, HPF2, HPF3, and HPF4 are sequentially increased, and the cut-off frequencies of the low pass filters LPF1, LPF2, LPF3, and LPF4 are sequentially increased. The cut-off frequency of the high pass filter HPF1 is the same as the cut-off frequency of the low pass filter LPF1, the cut-off frequency of the high pass filter HPF2 is the same as the cut-off frequency of the low pass filter LPF2, the cut-off frequency of the high pass filter HPF3 is the same as the cut-off frequency of the low pass filter LPF3, and the cut-off frequency of the high pass filter HPF4 is the same as the cut-off frequency of the low pass filter LPF 4.
When the frequency of the antenna signal is smaller than the first preset low-pass frequency, the frequency tuning unit is a first low-pass branch, and the first low-pass branch comprises a low-pass filter and an inductor and is connected with the input end. As shown in fig. 1, the cut-off frequency of the low pass filter LPF1 is set to 720Mhz, the cut-off frequency of the high pass filter HPF1 is also set to 720Mhz, and when the frequency of the passing antenna signal is 700Mhz, the signal is cut off before the high pass filter HPF1, passes through the low pass filter LPF1, and then passes through the four inductors L1 to L4. I.e. the frequency 700Mhz of the antenna signal is smaller than the first preset low pass frequency 720Mhz, the antenna signal passes through a first low pass branch, the first low pass branch comprises four inductors of low pass filters LPF1 and L1 to L4, and the low pass filter LPF1 is connected to the input. At 700Mhz, the tuning unit exhibits an inductance value of 6nh, i.e., the series connection of the four inductors L1 to L4 together represents 6nh, which causes the antenna to resonate within a bandwidth around 700 Mhz.
The frequency tuning unit is a first high-pass branch and comprises a high-pass filter, and the first high-pass branch is connected with the output end. As shown in fig. 1, cut-off frequencies of the high pass filters HPF1, HPF2HPF3, and HPF4 are set to 720Mhz, 820Mhz, 920Mhz, and 1Ghz, respectively, and cut-off frequencies of the low pass filters LPF1, LPF2, LPF3, and LPF4 are set to 720Mhz, 820Mhz, 920Mhz, and 1Ghz, respectively; when the frequency of the passing antenna signal is 1.1Ghz, the frequency of the antenna signal is larger than the maximum high-pass cutoff frequency of 1Ghz, and the antenna signal passes through all high-pass filters and does not pass through an inductor. I.e. the antenna signal frequency 1.1Ghz is larger than the first preset high-pass frequency 1Ghz, the antenna signal passes through a first high-pass branch, the first high-pass branch comprises high-pass filters HPF1, HPF2, HPF3 and HPF4, and the high-pass filters HPF4 are connected with the output end. After the high-pass filter HPF4, a low-pass filter and an inductor are not arranged, and the signal with the frequency higher than the cut-off frequency of the high-pass filter HPF4 is directly connected, so that the signal is free from any inductor, inductive reactance and influence.
Wherein, as shown in fig. 1, for a signal of 800Mhz, the cut-off frequency of the high pass filter HPF2 and the low pass filter LPF2 is 820Mhz, the signal may pass through the high pass filter HPF1, cut-off before the high pass filter HPF2, and not pass through the low pass filter LPF1, only pass through the low pass filter LPF2, and then sequentially pass through the inductors L2 to L4. At 800Mhz, the tuning unit exhibits an inductance value of 2nh, i.e., the series connection of the three inductors L2 to L4 together represents 2nh, which causes the antenna to resonate within a bandwidth around 800 Mhz. For a signal of 900Mhz, the cut-off frequency of the high pass filter HPF3 and the low pass filter LPF3 is 920Mhz, and the signal may pass through the high pass filters HPF1 and HPF2, cut off before the high pass filter HPF3, and not pass through the low pass filters LPF1 and LPF2, pass through the low pass filter LPF3, and then pass through the inductors L3 and L4 in order. At 900Mhz the tuning element exhibits an inductance value of 0.6nh, i.e. the series connection of L3 and L4 together represents 0.6nh, causing the antenna to resonate within a bandwidth around 900 Mhz. By analogy, the cut-off frequencies of the HPFs and LPFs are not limited to the above examples of the present invention, and the numbers of the inductors, HPFs and LPFs are not limited to the above examples, and may be changed according to actual needs, so that the more the numbers of the inductors, HPFs and LPFs are set, the more the frequency is subdivided, and the better the tuning effect on the antenna is. The embodiment of the invention can realize wider antenna resonance bandwidth by arranging the antenna tuning circuit.
The embodiment of the invention provides a method for realizing an antenna tuning circuit, which comprises the following steps: setting a frequency tuning unit, wherein the frequency tuning unit comprises a low-pass branch and a high-pass branch, the low-pass branch comprises a low-pass filter and at least one inductor, and the high-pass branch comprises a plurality of high-pass filters; and setting a tuning node, wherein the tuning node is connected with an adjacent high-pass filter in series, and the low-pass branch is connected with the high-pass branch through the tuning node.
As shown in fig. 2, the flow of the method for implementing the antenna tuning circuit is as follows:
201. the method comprises the steps of setting a frequency tuning unit, wherein the frequency tuning unit comprises a low-pass branch and a high-pass branch, the low-pass branch comprises a low-pass filter and at least one inductor, and the high-pass branch comprises a plurality of high-pass filters.
For example, a frequency tuning unit is provided, and the frequency tuning unit is connected with the antenna to play a role in adjusting the impedance of the antenna. The frequency tuning unit comprises a low-pass branch and a high-pass branch, the low-pass branch comprises a low-pass filter and at least one inductor, and the high-pass branch comprises a high-pass filter.
Each high-pass filter is provided with a preset high-pass frequency, and a plurality of preset high-pass frequencies from an input end to an output end are sequentially increased; each low-pass filter is provided with a preset low-pass frequency, and a plurality of preset low-pass frequencies from the input end to the output end are sequentially increased. The input end is connected with the antenna end, and the output end is connected with the feed source end.
The frequency unit is set to be a first low-pass branch, the first low-pass branch is connected with the input end, and the first low-pass branch comprises a low-pass filter and an inductor. As shown in fig. 3, the low-pass filter of the first low-pass branch is LPF1 (304), and for the antenna signal with a frequency smaller than the cut-off frequency of LPF1, the impedance of the antenna is adjusted only by the low-pass filter 304 and the inductors L1 to L3 on the first low-pass branch.
The frequency unit is set to be a first high-pass branch, the first high-pass branch is connected with the output end, and the first high-pass branch comprises a high-pass filter. As shown in fig. 3, the high-pass filters of the first high-pass branch are HPF1, HPF2 and HPF3, and for the antenna signal with a frequency greater than the cutoff frequency of HPF3 (303), the high-pass filter on the first high-pass branch only acts to adjust the impedance of the antenna.
202. And setting a tuning node, wherein the tuning node is connected with an adjacent high-pass filter in series, and the low-pass branch is connected with the high-pass branch through the tuning node.
For example, a tuning node is arranged between adjacent high-pass filters, the tuning node is connected with the adjacent high-pass filters in series, and the low-pass branch is connected with the high-pass branch through the tuning node.
As shown in fig. 3, a tuning node 306 is provided between the high pass filters HPF1 and HPF2, and a tuning node 307 is provided between the high pass filters HPF2 and HPF 3. The low pass filter LPF2 is connected to the high pass filter via a tuning node 306, and the low pass filter LPF3 is connected to the high pass filter via a tuning node 307.
Correspondingly, an embodiment of the present invention further provides a mobile terminal, where the mobile terminal includes an antenna tuning circuit according to the embodiment of the present invention, as shown in fig. 4, the mobile terminal may include a Radio Frequency (RF) circuit 401, a memory 402 including one or more computer readable storage media, an input unit 403, a display unit 404, a sensor 405, an audio circuit 406, a wireless fidelity (WiFi, wireless Fidelity) module 407, a processor 408 including one or more processing cores, and a power supply 409. It will be appreciated by those skilled in the art that the terminal structure shown in fig. 4 is not limiting of the terminal and may include more or fewer components than shown, or may combine certain components, or a different arrangement of components. Wherein:
the RF circuit 401 may be used for receiving and transmitting signals during the process of receiving and transmitting information or communication, in particular, after receiving downlink information of a base station, the downlink information is processed by one or more processors 408; in addition, data relating to uplink is transmitted to the base station. Typically, RF circuitry 401 includes, but is not limited to, an antenna, at least one amplifier, a tuner, one or more oscillators, a subscriber identity module (SIM, subscriber Identity Module) card, a transceiver, a coupler, a low noise amplifier (LNA, low Noise Amplifier), a duplexer, and the like. In addition, the RF circuitry 401 may also communicate with networks and other devices through wireless communications. The wireless communication may use any communication standard or protocol including, but not limited to, global system for mobile communications (GSM, global System of Mobile communication), general packet radio service (GPRS, general Packet Radio Service), code division multiple access (CDMA, code Division Multiple Access), wideband code division multiple access (WCDMA, wideband Code Division Multiple Access), long term evolution (LTE, long Term Evolution), email, short message service (SMS, short Messaging Service), and the like.
The memory 402 may be used to store software programs and modules, and the processor 408 may execute various functional applications and data processing by executing the software programs and modules stored in the memory 402. The memory 402 may mainly include a storage program area and a storage data area, wherein the storage program area may store an operating system, an application program (such as a sound playing function, an image playing function, etc.) required for at least one function, and the like; the storage data area may store data (such as audio data, phonebooks, etc.) created according to the use of the mobile terminal, etc. In addition, memory 402 may include high-speed random access memory, and may also include non-volatile memory, such as at least one magnetic disk storage device, flash memory device, or other volatile solid-state storage device. Accordingly, the memory 402 may also include a memory controller to provide access to the memory 402 by the processor 408 and the input unit 403.
The input unit 403 may be used to receive input numeric or character information and to generate keyboard, mouse, joystick, optical or trackball signal inputs related to user settings and function control. In particular, in one particular embodiment, input unit 403 may include a touch-sensitive surface, as well as other input devices. The touch-sensitive surface, also referred to as a touch display screen or a touch pad, may collect touch operations thereon or thereabout by a user (e.g., operations thereon or thereabout by a user using any suitable object or accessory such as a finger, stylus, etc.), and actuate the corresponding connection means according to a predetermined program. Alternatively, the touch-sensitive surface may comprise two parts, a touch detection device and a touch controller. The touch detection device detects the touch azimuth of a user, detects a signal brought by touch operation and transmits the signal to the touch controller; the touch controller receives touch information from the touch detection device and converts it into touch point coordinates, which are then sent to the processor 408, and can receive commands from the processor 408 and execute them. In addition, touch sensitive surfaces may be implemented in a variety of types, such as resistive, capacitive, infrared, and surface acoustic waves. In addition to the touch-sensitive surface, the input unit 403 may also comprise other input devices. In particular, other input devices may include, but are not limited to, one or more of a physical keyboard, function keys (such as volume control keys, switch keys, etc.), a trackball, mouse, joystick, etc.
The display unit 404 may be used to display information input by a user or information provided to the user and various graphical user interfaces of the terminal, which may be composed of graphics, text, icons, video and any combination thereof. The display unit 604 may include a display panel, which may be optionally configured in the form of a liquid crystal display (LCD, liquid Crystal Display), an Organic Light-Emitting Diode (OLED), or the like. Further, the touch-sensitive surface may overlay a display panel, upon which or near touch operations are detected by the touch-sensitive surface, which is communicated to the processor 608 to determine the type of touch event, and the processor 408 then provides a corresponding visual output on the display panel based on the type of touch event. Although in fig. 4 the touch sensitive surface and the display panel are implemented as two separate components for input and output functions, in some embodiments the touch sensitive surface may be integrated with the display panel to implement the input and output functions.
The terminal may also include at least one sensor 405, such as a light sensor, a motion sensor, and other sensors. Specifically, the light sensor may include an ambient light sensor that may adjust the brightness of the display panel according to the brightness of ambient light, and a proximity sensor that may turn off the display panel and/or backlight when the terminal moves to the ear. As one of the motion sensors, the gravity acceleration sensor can detect the acceleration in all directions (generally three axes), and can detect the gravity and the direction when the mobile phone is stationary, and can be used for applications of recognizing the gesture of the mobile phone (such as horizontal and vertical screen switching, related games, magnetometer gesture calibration), vibration recognition related functions (such as pedometer and knocking), and the like; other sensors such as gyroscopes, barometers, hygrometers, thermometers, infrared sensors, etc. that may also be configured in the terminal are not described in detail herein.
Audio circuitry 406, speakers, and a microphone may provide an audio interface between the user and the terminal. The audio circuit 406 may transmit the received electrical signal after audio data conversion to a speaker, where the electrical signal is converted to a sound signal for output; on the other hand, the microphone converts the collected sound signals into electrical signals, which are received by the audio circuit 406 and converted into audio data, which are processed by the audio data output processor 408 for transmission to, for example, another terminal via the RF circuit 401, or which are output to the memory 402 for further processing. Audio circuitry 406 may also include an ear bud jack to provide communication of the peripheral ear bud with the terminal.
The WiFi belongs to a short-distance wireless transmission technology, and the mobile terminal can help the user to send and receive e-mail, browse web pages, access streaming media and the like through the WiFi module 407, so that wireless broadband internet access is provided for the user. Although fig. 4 shows a WiFi module 407, it is understood that it does not belong to the essential constitution of the terminal, and can be omitted entirely as required within the scope of not changing the essence of the invention.
The processor 408 is a control center of the terminal, and connects various parts of the entire handset using various interfaces and lines, and performs various functions of the terminal and processes data by running or executing software programs and/or modules stored in the memory 402, and calling data stored in the memory 402, thereby performing overall monitoring of the handset. Optionally, the processor 408 may include one or more processing cores; preferably, the processor 408 may integrate an application processor that primarily handles operating systems, user interfaces, applications, etc., with a modem processor that primarily handles wireless communications. It will be appreciated that the modem processor described above may not be integrated into the processor 408.
The terminal also includes a power supply 409 (e.g., a battery) for powering the various components, which may be logically connected to the processor 408 through a power management system that performs functions such as managing charge, discharge, and power consumption. The power supply 409 may also include one or more of any of a direct current or alternating current power supply, a recharging system, a power failure detection circuit, a power converter or inverter, a power status indicator, and the like.
Although not shown, the terminal may further include a camera, a bluetooth module, etc., which will not be described herein. In this embodiment, the processor 408 in the terminal loads executable files corresponding to the processes of one or more application programs into the memory 402 according to the following instructions, and the processor 408 executes the application programs stored in the memory 402, so as to implement various functions:
setting a frequency tuning unit, wherein the frequency tuning unit comprises a low-pass branch and a high-pass branch, the low-pass branch comprises a low-pass filter and at least one inductor, and the high-pass branch comprises a plurality of high-pass filters;
and setting a tuning node, wherein the tuning node is connected with an adjacent high-pass filter in series, and the low-pass branch is connected with the high-pass branch through the tuning node.
The antenna tuning circuit, the implementation method and the mobile terminal provided by the embodiment of the invention are described in detail, and specific examples are applied to illustrate the principle and implementation of the invention, and the description of the above embodiments is only used for helping to understand the method and the core idea of the invention; meanwhile, as those skilled in the art will have variations in the specific embodiments and application scope in light of the ideas of the present invention, the present description should not be construed as limiting the present invention.
Claims (9)
1. An antenna tuning circuit, comprising:
the antenna is used for receiving and transmitting antenna signals with a plurality of frequencies;
the frequency tuning unit comprises a low-pass branch and a high-pass branch, the low-pass branch comprises a low-pass filter and at least one inductor, the high-pass branch comprises a plurality of high-pass filters, each high-pass filter is provided with a preset high-pass frequency, the preset high-pass frequencies from an input end to an output end are sequentially increased, each low-pass filter is provided with a preset low-pass frequency, the preset low-pass frequencies from the input end to the output end are sequentially increased, the input end is connected with an antenna end, and the output end is connected with a feed source end;
a tuning node is arranged between the adjacent high-pass filters, the tuning node is used for being connected with the adjacent high-pass filters in series, and the low-pass branch is connected with the high-pass branch through the tuning node.
2. The antenna tuning circuit of claim 1, wherein the frequency tuning unit is coupled to the antenna for transceiving antenna signals at a plurality of frequencies, comprising:
the frequency of the antenna signal is smaller than a first preset low-pass frequency, and the frequency tuning unit is a first low-pass branch;
the first low-pass branch is connected with an input end, the input end is connected with the antenna, and the first low-pass branch comprises the low-pass filter and the inductor.
3. The antenna tuning circuit of claim 1, wherein the frequency tuning unit is coupled to the antenna for transceiving antenna signals at a plurality of frequencies, comprising:
the frequency of the antenna signal is larger than a first preset high-pass frequency, and the frequency tuning unit is a first high-pass branch;
the first high-pass branch is connected with the output end, the output end is connected with the feed source, and the first high-pass branch comprises the high-pass filter.
4. The antenna tuning circuit of claim 1, wherein the high-pass branch comprises a high-pass filter comprising:
the high-pass filter with the minimum preset high-pass frequency is connected with the input end, and the high-pass filter with the maximum preset high-pass frequency is connected with the output end.
5. The antenna tuning circuit of claim 1, wherein a tuning node is disposed between the adjacent high pass filters, the tuning node being configured to connect the adjacent high pass filters in series, the low pass branch and the high pass branch being connected by the tuning node, comprising:
the plurality of tuning nodes are sequentially arranged from the input end to the output end, and preset low-pass frequencies of the plurality of low-pass filters connected with the tuning nodes are sequentially increased.
6. A method of implementing an antenna tuning circuit, comprising:
setting a frequency tuning unit, wherein the frequency tuning unit comprises a low-pass branch and a high-pass branch, the low-pass branch comprises a low-pass filter and at least one inductor, the high-pass branch comprises a plurality of high-pass filters, each high-pass filter is provided with a preset high-pass frequency, the preset high-pass frequencies from an input end to an output end are sequentially increased, each low-pass filter is provided with a preset low-pass frequency, the preset low-pass frequencies from the input end to the output end are sequentially increased, the input end is connected with an antenna end, and the output end is connected with a feed source end;
and setting a tuning node, wherein the tuning node is arranged between adjacent high-pass filters, the tuning node is connected with the adjacent high-pass filters in series, and the low-pass branch is connected with the high-pass branch through the tuning node.
7. The method of implementing an antenna tuning circuit of claim 6, wherein the setting a frequency tuning unit comprises:
setting the frequency tuning unit as a first low-pass branch;
the first low-pass branch is connected with an input end, the input end is connected with an antenna, and the first low-pass branch comprises the low-pass filter and the inductor.
8. The method of implementing an antenna tuning circuit of claim 6, wherein the setting a frequency tuning unit comprises:
setting the frequency tuning unit as a first high-pass branch;
the first high-pass branch is connected with the output end, the output end is connected with the feed source, and the first high-pass branch comprises the high-pass filter.
9. A mobile terminal comprising an antenna tuning circuit as claimed in any one of claims 1 to 5.
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