CN107526702B - USB interface circuit of mobile terminal and mobile terminal with same - Google Patents
USB interface circuit of mobile terminal and mobile terminal with same Download PDFInfo
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- CN107526702B CN107526702B CN201710834400.6A CN201710834400A CN107526702B CN 107526702 B CN107526702 B CN 107526702B CN 201710834400 A CN201710834400 A CN 201710834400A CN 107526702 B CN107526702 B CN 107526702B
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Classifications
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F13/00—Interconnection of, or transfer of information or other signals between, memories, input/output devices or central processing units
- G06F13/38—Information transfer, e.g. on bus
- G06F13/40—Bus structure
- G06F13/4063—Device-to-bus coupling
- G06F13/4068—Electrical coupling
-
- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F13/00—Interconnection of, or transfer of information or other signals between, memories, input/output devices or central processing units
- G06F13/38—Information transfer, e.g. on bus
- G06F13/42—Bus transfer protocol, e.g. handshake; Synchronisation
- G06F13/4282—Bus transfer protocol, e.g. handshake; Synchronisation on a serial bus, e.g. I2C bus, SPI bus
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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
- H04B1/38—Transceivers, i.e. devices in which transmitter and receiver form a structural unit and in which at least one part is used for functions of transmitting and receiving
- H04B1/40—Circuits
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F2213/00—Indexing scheme relating to interconnection of, or transfer of information or other signals between, memories, input/output devices or central processing units
- G06F2213/0042—Universal serial bus [USB]
Abstract
The application provides a USB interface circuit of a mobile terminal, which comprises: the USB interface element is arranged at the bottom of the mobile terminal, at least two fixed pins extend out, the fixed pins are arranged on two sides of the central axis of the USB interface element, and at least one short-circuit point is formed after any two or more fixed pins are in short circuit; the first end of each inductive element is connected with the short-circuit point in a one-to-one correspondence manner; the second ends of the inductance elements are connected with the main board or the metal shell of the mobile terminal; the inductance value of the inductance element is 82nH to 120nH. After the technical scheme is adopted, clutter resonance generated by the USB interface circuit is reduced, interference to an antenna is reduced, and antenna efficiency is improved.
Description
Technical Field
The present application relates to the field of mobile terminals, and in particular, to a USB interface circuit of a mobile terminal and a mobile terminal having the same.
Background
At present, mobile terminal devices such as smart phones, satellite phones, mobile stations and the like are often used in daily life and work, and people can conveniently contact remotely. The mobile terminal transmits electromagnetic wave signals outwards through the antenna and also receives electromagnetic wave signals from the outside, and when the mobile terminal transmits signals, a variable current or an electric field is generated on the antenna. In order to meet the diversified data transmission modes of people, most mobile terminals are provided with USB interfaces, and data interaction is performed with the outside through a wired connection mode. With the miniaturization and integration of the design of the mobile terminal, the circuit of the USB interface, such as the ground part or the metal housing, is often very close to the antenna, and the coupling degree with the antenna is very large, which causes a certain interference and influence to the antenna.
The prior art solution to this problem starts from two aspects, namely, improving the design of the antenna, and considering that the antenna is far away from the avoidance USB interface area as far as possible from the physical distance. The mobile terminal has the defects that the space in the mobile terminal is narrow, the antenna wiring area is very limited, and if the antenna is avoided from a physical distance, the antenna wiring area becomes smaller, and the performance of the antenna is affected. Another aspect is to improve the USB interface, for example, the related elements of the USB interface are suspended from ground, or the USB interface elements ensure good ground. However, even if the USB interface element is designed to float or is grounded entirely, the interference effect of the USB interface element exists, and noise resonance is usually generated by coupling with the USB at the intermediate frequency band.
Therefore, a new type of USB interface circuit for a mobile terminal is needed, which can effectively reduce interference and influence of the USB interface circuit on an antenna, and improve the working performance of the antenna.
Disclosure of Invention
In order to overcome the technical defects, the application aims to provide a USB interface circuit of a mobile terminal and the mobile terminal with the USB interface circuit, and clutter resonance generated by the USB interface circuit is effectively filtered out by connecting an inductance element in series with a grounding part of the USB interface circuit, so that the working performance of an antenna is improved.
In a first aspect of the present application, a USB interface circuit of a mobile terminal is disclosed, the USB interface circuit comprising: the USB interface element is arranged at the bottom of the mobile terminal, at least two fixed pins extend out, the fixed pins are arranged on two sides of the central axis of the USB interface element, and at least one short-circuit point is formed after any two or more fixed pins are in short circuit; the first end of each inductive element is connected with the short-circuit point in a one-to-one correspondence manner; the second ends of the inductance elements are connected with the main board or the metal shell of the mobile terminal; the inductance value of the inductance element is 82nH to 120nH.
In certain embodiments of the first aspect of the present application, the USB interface element is Micro USB.
In certain embodiments of the first aspect of the present application, the USB interface element further comprises the following functional pins:
a power supply pin for providing a 5V power supply for the USB interface circuit;
a data line negative electrode pin connected with a data line negative electrode in the mobile terminal;
a data line positive electrode pin connected with a data line positive electrode in the mobile terminal;
the reserved pins can be preset to be in a grounding state or an ungrounded state;
and the grounding pin is connected with the reference ground.
In certain embodiments of the first aspect of the present application, the central axis of the USB interface element coincides with the central axis of the mobile terminal.
In some embodiments of the first aspect of the present application, the number of the fixing pins is four, two fixing pins are respectively arranged at two sides of the central axis, and the fixing pins arranged at the same side of the central axis are shorted to form a short joint; the inductance elements are two, are respectively arranged on two sides of the central axis and are respectively connected with the short-circuit points arranged on the same side of the central axis. In certain embodiments of the first aspect of the present application, the inductance value of the inductance element is 100nH.
In a second aspect of the application, a mobile terminal is disclosed, comprising a USB interface circuit as claimed in claim 1.
In certain embodiments of the second aspect of the present application, the mobile terminal includes:
the main antenna unit is arranged at the bottom of the mobile terminal and is used for communicating with a cellular mobile network;
the auxiliary antenna unit is arranged at the top of the mobile terminal and is used for assisting the main antenna unit to work;
the GPS antenna unit is arranged at the top of the mobile terminal and is used for communicating with a GPS network;
the GPS antenna unit and the auxiliary antenna unit are respectively positioned at two sides of the central axis of the mobile terminal.
In certain embodiments of the second aspect of the present application, the main antenna unit includes an inverted-F antenna and a parasitic antenna; the auxiliary antenna unit is an inverted F-shaped antenna; the GPS antenna unit is an inverted F antenna.
In certain embodiments of the second aspect of the present application, the GPS antenna element is replaced with a WiFi antenna element.
After the technical scheme is adopted, compared with the prior art, the method has the following beneficial effects:
1. clutter resonance generated by the USB interface circuit is reduced, and interference to an antenna is reduced;
2. the antenna efficiency is improved.
Drawings
FIG. 1 is a block diagram of a USB interface circuit of a mobile terminal according to a preferred embodiment of the present application;
FIG. 2 is a schematic diagram of the USB interface element of FIG. 1 according to a preferred embodiment of the present application;
FIG. 3 is a block diagram of a mobile terminal having the USB interface circuit of FIG. 1 in accordance with a preferred embodiment of the present application;
FIG. 4 is a diagram showing experimental results of a mobile terminal according to the prior art in accordance with a preferred embodiment of the present application;
FIG. 5 is a diagram showing experimental results of a mobile terminal having the USB interface circuit of FIG. 1 according to a preferred embodiment of the present application;
fig. 6 is a graph of experimental results regarding free space efficiency of the subject of fig. 4 and 5 in accordance with a preferred embodiment of the present application.
Reference numerals:
100-USB interface circuit, 101-USB interface element, 102-short contact, 103-inductance element, 104-reference ground, 1011-fixed pin, 1012-power pin, 1013-data line negative pin, 1014-data line positive pin, 1015-reserved pin, 1016-ground pin, 200-mobile terminal, 201-main antenna unit, 202-auxiliary antenna unit, 203-GPS antenna unit.
Detailed Description
Further advantages and effects of the present application will become apparent to those skilled in the art from the disclosure of the present application, which is described by the following specific examples.
In the following description, reference is made to the accompanying drawings which describe several embodiments of the application. The following detailed description is not to be taken in a limiting sense, and the scope of embodiments of the present application is defined only by the claims of the issued patent. Spatially relative terms, such as "upper," "lower," "left," "right," "lower," "upper," and the like, may be used herein to facilitate a description of one element or feature as illustrated in the figures as being related to another element or feature.
Although the terms first, second, etc. may be used herein to describe various elements in some examples, these elements should not be limited by these terms. These terms are only used to distinguish one element from another element.
Furthermore, as used herein, the singular forms "a," "an," and "the" are intended to include the plural forms as well, unless the context indicates otherwise: a, A is as follows; b, a step of preparing a composite material; c, performing operation; a and B; a and C; b and C; A. an exception to this definition will occur only when a combination of elements, functions, steps or operations are in some way inherently mutually exclusive.
As used herein, the term "if" may be interpreted to mean "when …" or "once …" or "in response to a determination" or "in response to detection" depending on the context. Similarly, the phrase "if a determination" or "if a [ stated condition or event ] is detected" is optionally interpreted to mean "upon determination" or "in response to determination" or "upon detection of a [ stated condition or event ]" or "in response to detection of a [ stated condition or event ]" depending on the context.
Referring to fig. 1, which is a block diagram of a USB interface circuit of a mobile terminal according to a preferred embodiment of the present application, the USB interface circuit 100 includes:
-USB interface element 101
USB, an abbreviation of english Universal Serial Bus (universal serial bus), is an external bus standard, used for standardizing connection and communication between a computer and an external device, and is an interface technology applied to the field of information technology. The USB interface supports plug and play and hot plug functions of the device. In this embodiment, the mobile terminal 200 is connected to a matched USB connector through the USB interface element 101, and finally performs serial communication with a computer or other devices. The corresponding USB connector may be a USB connection line, a USB adapter, or other connection device with a USB interface.
The USB interface element 101 is ase:Sub>A component connected to an external USB connector, and has ase:Sub>A structure that meets ase:Sub>A general standard, for example, ase:Sub>A standard USB-ase:Sub>A Type interface, ase:Sub>A standard USB-B Type interface, ase:Sub>A Micro USB interface, ase:Sub>A Type-C USB interface, ase:Sub>A Mini USB interface, etc., where different types of USB interfaces have different Pin numbers, such as 4Pin, 5Pin, etc. The USB interface element 101 is disposed at the bottom of the mobile terminal 200, the interface faces the bottom of the mobile terminal 200, and such a layout has become a mainstream design of the mobile terminal 200, and the USB interface element 101 may also be used as a charging interface of the mobile terminal 200.
The USB interface element 101 is fixed to the mobile terminal 200 through a plurality of fixing pins 1011. The number of the fixing pins 1011 is at least two, the positions of the fixing pins 1011 have no standard requirement, and the fixing pins 1011 are generally designed correspondingly according to the structure of the mobile terminal 200 so as to match, and generally the fixing pins 1011 are arranged on two sides of the central axis of the USB interface element 101 so as to uniformly bear force, thereby achieving a better fixing effect. The fixing pins 1011 are made of metal, are integrally formed with the USB interface element 101, and extend outwards from the main body of the USB interface element 101. The fixing pins 1011 may be soldered on the motherboard of the mobile terminal 200 or fixed on an internal structure of the mobile terminal 200.
Short contact 102
Any two or more of the fixed pins 1011 are shorted to form at least one shorting point 102. The shorting points 102 are electrical connection points, and the fixed pins 1011 connected to each shorting point 102 are electrically connected to each other. The fixing pins 1011 are connected by electrical wires, metal strips or conductive traces on the motherboard, and each fixing pin 1011 is connected by soldering to the electrical wires, metal strips or conductive traces on the motherboard to ensure good electrical connection. The short-circuit point 102 may be a solder joint, and may be disposed at any position on an electrical wire, a metal strap, or a conductive line on a motherboard connected to the fixed pin 1011 according to the internal structure of the mobile terminal 200, or may be disposed on the fixed pin 1011.
For example, when the USB interface element 101 has two fixing pins 1011, the fixing pins 1011 are respectively disposed on two sides of the central axis, and the two fixing pins 1011 are connected to form a short contact 102. When the USB interface element 101 has more than three fixing pins 1011, all the fixing pins 1011 may be connected to the same short-circuit point 102, or the fixing pins 1011 disposed on the same side of the central axis may be connected to the same short-circuit point 102, so as to form two short-circuit points 102. Two or more fixed pins 1011 may optionally be connected to a shorting point 102 diagonally, perpendicular to the central axis. Two or more fixed pins 1011 at any position can be selected to be connected to one short-circuit point 102, and there can be more than two short-circuit points 102 in the same USB interface circuit 100. When the number of the short-circuit points 102 is two or more, they may be distributed on both sides of the central axis or on the same side of the central axis.
-an inductive element 103
The inductive element 103, i.e. an Inductor in the electrical field, is an element capable of converting electrical energy into magnetic energy for storage, similar in construction to a transformer, but with only one winding. The inductor has a certain inductance, which only impedes the current variation. If the inductor is in a state where no current is passing, it will attempt to block the flow of current through it when the circuit is on; if the inductor is in a state where current is flowing, it will attempt to maintain the current unchanged when the circuit is open. The inductor is also called choke, reactor and dynamic reactor.
In this embodiment, at least one inductance element 103 is provided, and the number of the inductance elements corresponds to the short-circuit points 102 one by one, for example, if the USB interface circuit 100 has only one short-circuit point, then only one inductance element 103 is provided. The inductive element 102 has a first end and a second end, and in operation current flows along the first end into the second end or along the second end into the first end. The first end of each inductance element 103 is connected to its corresponding short-circuit point 102, and the inductance element 103 has a soldering position on the motherboard of the mobile terminal 200, so that a portion of the soldering position corresponding to the first end is connected to the short-circuit point 102 through a wire on the motherboard.
The inductance value of the inductive element 103 is preferably 82nH to 120nH in order to match the antenna of the mobile terminal 200, which operates in the mobile cellular network band. The inductance has the function of preventing current change, and the inductance with different inductance values has better inhibiting effect on the current change with corresponding frequency. When the antenna of the mobile terminal 200 works, the inductance element 103 takes the inductance value of 82nH to 120nH, which can effectively inhibit clutter resonance generated by the USB interface element 101 induced by the current changing on the antenna, reduce interference and influence on the antenna, and effectively improve the working efficiency of the antenna. Since the antenna is designed differently according to the model of the mobile terminal 200, and may operate in different frequency bands, a suitable inductance value may be selected accordingly according to the operating frequency band of the antenna. In order to improve the mid-frequency performance of the antenna, the inductance value of the inductance element 103 is preferably 100nH.
-reference ground 104
The reference ground 104 is disposed on a motherboard or a metal housing of the mobile terminal 200, and provides a 0V reference point for all electrical connections in the mobile terminal 200. The second end of each inductive element 103 is connected to the reference ground 104, and the inductive elements 103 may be respectively connected to the reference ground 104 nearby, since the reference ground 104 is distributed throughout the mobile terminal 200. The mobile terminal 200 is often designed with a large area of the reference ground 104, and is mainly distributed on a motherboard, and the mobile terminal 200 whose housing is made of metal often uses the metal housing as the reference ground 104.
In certain embodiments of the first aspect of the present application, the USB interface element 101 further includes the following functional pins:
-power supply pin 1012
The power pin 1012, also called VBUS pin, provides 5V power for the USB interface circuit 100. When the computer is connected to the mobile terminal 200, the computer provides a power of 5V to the mobile terminal 200 through the power pin 1012. The power pin 1012 also plays a role of charging, and at present, the mobile terminal 200 supports charging of the USB interface, and the mobile terminal 200 can be charged through an ac-dc power adapter or a removable external power supply.
Data line negative pin 1013
The negative data line pin 1013, also called D-pin, is connected to the negative data line in the mobile terminal 200. At least two data lines are needed for serial data transmission to form a reference level, and signal transmission is realized by using the level change. The data line negative electrode pin 1013 is connected to a corresponding data line negative electrode in the mobile terminal 200.
Data line positive lead 1014
The data line positive pin 1014, also called the d+ pin, connects the data line positive electrode in the mobile terminal 200. The data line positive pin 1014 is connected to a corresponding data line positive electrode in the mobile terminal 200.
Reserved pins 1015
The reserved pin 1015, also called an ID pin, may be preset to a grounded state or an ungrounded state. The interface A is connected with the reference ground 104, and the interface B is not connected with the reference ground 104.
Ground pin 1016
The ground pin 1016, also referred to as the GND pin, is connected to the reference ground 104. Some mobile terminals 200 are designed to divide the reference ground 104 into analog signal ground and digital signal ground, or signal ground and power ground according to the design contents, and different reference grounds 104 are isolated to ensure that different currents or signals do not affect each other. The ground pin 1016 is commonly connected to signal ground as a reference potential to create a potential difference with the negative and positive data lines.
In certain embodiments of the first aspect of the present application, the number of the fixing pins 1011 is four, and two fixing pins 1011 are respectively disposed on two sides of the central axis, i.e., on each side of the central axis. The fixed pins 1011 on the same side of the central axis are short-circuited to form a short contact 102. Thus, the USB interface circuit 100 has two short-circuit points 102, which are respectively disposed on two sides of the central axis. Correspondingly, two inductance elements 103 are respectively arranged on two sides of the central axis, and each inductance element 103 is connected with a short-circuit point 102 positioned on the same side of the central axis. This embodiment gives a case where the number of the fixed pins 1011, the short-circuit points 102 and the inductance elements 103 are fixed, which is completely consistent with the embodiment shown in fig. 1.
Referring to fig. 2, a schematic structure of the USB interface element 101 in fig. 1 according to a preferred embodiment of the present application is shown, where the USB interface element 101 is a Micro USB. The type of the USB interface element 101 is preferably selected in this embodiment, namely, a Micro USB interface. The Micro USB interface is widely used in the mobile terminal 200, and particularly, the Micro USB interface is most widely used in the mobile terminal 200 equipped with the android operating system.
As can be seen from fig. 2, the USB interface element 101 further includes a metal housing, from which the fixing pin 1011 extends, and the fixing pin 1011 may extend toward the bottom surface or may extend toward the side surface or the top surface, so that the USB interface element 101 is fixed in the mobile terminal 200 according to the internal structure of the mobile terminal 200.
Also shown in fig. 2 are power pins 1012, data line negative pins 1013, data line positive pins 1014, reserved pins 1015, and ground pins 1016 arranged in a row, which are soldered to corresponding positions on the motherboard of the mobile terminal 200 so that corresponding lines on the motherboard are connected to the pins.
In certain embodiments of the first aspect of the present application, the central axis of the USB interface element 101 coincides with the central axis of the mobile terminal 200. In this embodiment, the position of the USB interface element 101 is preferably located in the middle of the bottom of the mobile terminal 200, and the central axes of the two are coincident. Such a design makes the USB interface element 101 symmetric to the mobile terminal 200.
Referring to fig. 3, which is a block diagram of a mobile terminal having the USB interface circuit of fig. 1 according to a preferred embodiment of the present application, the USB interface circuit is disposed at the bottom of the mobile terminal 200, and the mobile terminal 200 includes:
-a main antenna unit 201
A main antenna unit 201, disposed at the bottom of the mobile terminal 200, for communicating with a cellular mobile network. The cellular mobile communication (Cellular Mobile Communication) adopts a cellular wireless networking mode, and is connected between a terminal and network equipment through a wireless channel, so that the mutual communication of users in the activities is realized. The method is mainly characterized by mobility of the terminal and has the functions of handover and automatic roaming across a local network. The main antenna unit 201 may cover most of the frequency range between 700MHz and 2200MHz, and is suitable for cellular mobile networks of various systems, such as GSM networks, CDMA networks, TDMA networks, TD-LTE networks, etc.
-an auxiliary antenna unit 202
And the auxiliary antenna unit 202 is arranged at the top of the mobile terminal 200 and is used for assisting the main antenna unit 201 to work. With the development of 2G, 3G, and 4G communication networks, the same mobile terminal 200 needs to support multiple communication networks, and the design requirements for the antenna are higher and higher, and the requirement of covering all frequency bands cannot be met only by the main antenna unit 201. The auxiliary antenna unit 202 operates as a complement to the main antenna unit 201, for example, in a frequency band that cannot be covered by the main antenna unit 201, or in a receiving or transmitting state with the main antenna unit 201, respectively.
-GPS antenna unit 203
And the GPS antenna unit 203 is arranged on the top of the mobile terminal 200 and is used for communicating with a GPS network. A system for performing positioning and navigation in real time in the global scope by using GPS positioning satellites is called a global satellite positioning system, and is abbreviated as GPS. Most mobile terminals 200 are equipped with a GPS module and a GPS antenna to realize positioning and navigation functions. The GPS antenna unit 203 can receive signals of GPS positioning satellites, and perform functions such as position calculation and time synchronization.
The GPS antenna unit 203 and the auxiliary antenna unit 202 are respectively located at two sides of the central axis of the mobile terminal 200. That is, the GPS antenna unit 203 and the auxiliary antenna unit 202 are not overlapped, but are respectively arranged at both sides of the central axis so as to respectively perform an antenna function.
In certain embodiments of the second aspect of the present application, the main antenna unit 201 includes an inverted-F antenna and a parasitic antenna. The inverted-F antenna, i.e. the antenna with the shape similar to the inverted-F letter "F", is a common antenna design, and its main structure is often arranged along the edge of the casing of the mobile terminal 200, so that the structural characteristics of the mobile terminal 200 are fully utilized, and compared with a common monopole antenna, the inverted-F antenna has a wider frequency band coverage selection range. The parasitic antenna is used by matching components such as a capacitor, an inductor and the like with an antenna radiator so as to realize response to a specific frequency band. In this embodiment, the main antenna unit 201 is composed of two parts, one is an inverted-F antenna, and the other is a parasitic antenna, where the parasitic antenna may be a monopole antenna.
The auxiliary antenna unit 202 and the GPS antenna unit are inverted-F antennas, and the two sides of the top of the mobile terminal 200 are provided with sufficient space for arranging the inverted-F antennas, so that the above antenna units fully realize frequency band coverage.
In certain embodiments of the second aspect of the present application, the GPS antenna unit 203 is replaced with a WiFi antenna unit. In this embodiment, the mobile terminal 200 is accessed to have the function of wireless lan, and is realized by a WiFi antenna unit, and the position of the original GPS antenna unit 203 is replaced by a WiFi antenna unit. Wi-Fi is a technology that allows electronic devices to connect to a Wireless Local Area Network (WLAN), typically using the 2.4G UHF or 5G SHF ISM radio frequency bands.
Referring to fig. 4 and 5, there are respectively an experimental result diagram of a mobile terminal according to the prior art and an experimental result diagram of a mobile terminal having the USB interface circuit of fig. 1 according to a preferred embodiment of the present application. Fig. 4 and 5 are standing wave performance test results for the main antenna unit 201 of the mobile terminal 200, where the abscissa is frequency, the range is 650MHz to 3650MHz, and the ordinate is standing wave ratio. The standing wave ratio is called as voltage standing wave ratio, VSWR and SWR, which are abbreviated as English Voltage Standing Wave Ratio, and refers to the ratio of the voltage of the antinode of the standing wave to the voltage amplitude of the trough, and is also called as standing wave coefficient and standing wave ratio. When the standing-wave ratio is equal to 1, the impedance of the feeder line and the antenna is completely matched, and at the moment, all high-frequency energy is radiated by the antenna without energy reflection loss; and when the standing wave ratio is infinity, total reflection is indicated, and energy is not radiated. The same mobile terminal 200 is selected for testing in fig. 4 and 5. In the test of fig. 4, a resistor of 0 ohm is soldered at the position of the inductance element 103 as a wire to replace the inductance element 103, which is equivalent to the fixed pin 1011 directly connected to the reference ground 104; the test in fig. 5 uses an inductance element 103 with an inductance value of 100nH to connect the fixed pin 1011 and the reference ground 104, and the USB interface circuit 100 has four fixed pins 1011 and two inductance elements 103 as shown in fig. 1.
As can be seen from comparing the experimental curves in fig. 4 and fig. 5, regarding the curve portion with the frequency range of 1700MHz to 2200MHz, the curve in fig. 5 shows that the standing wave ratio is significantly smaller, which means that the reflection loss of the main antenna unit 201 is smaller when the inductance element 103 is connected, so that the efficiency is improved. And the frequency range of 1700MHz to 2200MHz is a range section commonly used for the mobile terminal 200, the present application is significant for improvement of the antenna performance of the mobile terminal 200.
According to the experimental objects corresponding to fig. 4 and 5, the free space efficiency of the application is also tested and calculated in two cases, as shown in fig. 6, wherein the dashed curve is the experimental result of the 100nH inductor 103, and the solid curve is the experimental result of the 0 ohm resistor. Free space efficiency is the opposite of free space loss. Free space loss refers to the loss of energy of an electromagnetic wave when it propagates in air, and the electromagnetic wave is lost when it penetrates any medium. The free space loss is the ratio of the energy lost to the total energy, and the sum of the free space loss and the free space efficiency is 1. The total power emitted by the main antenna element 201 and the power radiated by the main antenna element are measured separately, and the latter is divided by the former to calculate the free space efficiency. In the frequency range of 1700MHz to 2200MHz, the maximum free space efficiency of the antenna when the inductive element 103 is accessed can be improved by about 20%.
The application also provides OTA test results for the experimental objects corresponding to the figures 4 and 5. OTA (Over The Air) the test is to test the radiation power and the receiving sensitivity of the mobile phone in a specific microwave dark room. The OTA test mainly includes TRP and TIS parameters, wherein TRP (Total Radiated Power) is obtained by integrating and averaging the transmit power of the entire radiating sphere, which reflects the transmit power situation of the mobile terminal 200, in relation to the transmit power and antenna radiation performance of the mobile terminal 200 in the conducting situation. TIS (Total Isotropic Sensitivity) reflects the reception sensitivity index of the mobile terminal 200 throughout the radiating sphere, which reflects the reception sensitivity of the mobile terminal 200, in relation to the transmission sensitivity of the mobile terminal 200 and the radiation performance of the antenna. The test result table is given below:
the improvement in the above table is calculated by subtracting the result measured by the 0 ohm resistor from the result measured by the 100nH inductor, wherein the units of TRP and TIS are dB, and the larger TRP means the higher the antenna transmission efficiency and the smaller TIS means the higher the antenna reception sensitivity. After the inductance element 103 of 100nH is connected, TRP of a small frequency band is reduced slightly, but the total frequency band improving effect on TIS index is larger, and overall, the inductance element 103 of 100nH has a significant improving effect on the performance of the main antenna unit 200 of the mobile terminal 200.
It should be noted that the embodiments of the present application are preferred and not limited in any way, and any person skilled in the art may make use of the above-disclosed technical content to change or modify the same into equivalent effective embodiments without departing from the technical scope of the present application, and any modification or equivalent change and modification of the above-described embodiments according to the technical substance of the present application still falls within the scope of the technical scope of the present application.
Claims (7)
1. A USB interface circuit of a mobile terminal, the USB interface circuit comprising:
the USB interface element is arranged at the bottom of the mobile terminal, at least two fixed pins extend out, the fixed pins are arranged on two sides of the central axis of the USB interface element, and at least one short-circuit point is formed after any two or more fixed pins are in short circuit;
the first end of each inductive element is connected with the short-circuit point in a one-to-one correspondence manner;
the second ends of the inductance elements are connected with the main board or the metal shell of the mobile terminal;
the inductance value of the inductance element is 82nH to 120nH;
the number of the fixed pins is four, two fixed pins are respectively arranged on two sides of the central axis, and the fixed pins arranged on the same side of the central axis are in short circuit to form a short contact;
the inductance elements are two, are respectively arranged on two sides of the central axis and are respectively connected with short-circuit points arranged on the same side of the central axis;
the central axis of the USB interface element coincides with the central axis of the mobile terminal;
the inductance value of the inductance element is 100nH.
2. The USB interface circuit of claim 1, wherein,
the USB interface element is Micro USB.
3. The USB interface circuit of claim 2, wherein,
the USB interface element further comprises the following functional pins:
a power supply pin for providing a 5V power supply for the USB interface circuit;
a data line negative electrode pin connected with a data line negative electrode in the mobile terminal;
a data line positive electrode pin connected with a data line positive electrode in the mobile terminal;
the reserved pins can be preset to be in a grounding state or an ungrounded state;
and the grounding pin is connected with the reference ground.
4. A mobile terminal, characterized in that,
the mobile terminal comprising the USB interface circuit of claim 1.
5. The mobile terminal of claim 4, wherein,
the mobile terminal includes:
the main antenna unit is arranged at the bottom of the mobile terminal and is used for communicating with a cellular mobile network;
the auxiliary antenna unit is arranged at the top of the mobile terminal and is used for assisting the main antenna unit to work;
the GPS antenna unit is arranged at the top of the mobile terminal and is used for communicating with a GPS network;
the GPS antenna unit and the auxiliary antenna unit are respectively positioned at two sides of the central axis of the mobile terminal.
6. The mobile terminal of claim 5, wherein,
the main antenna unit comprises an inverted F-shaped antenna and a parasitic antenna;
the auxiliary antenna unit is an inverted F-shaped antenna;
the GPS antenna unit is an inverted F antenna.
7. A mobile terminal according to claim 5 or 6, wherein,
the GPS antenna unit is replaced by a WiFi antenna unit.
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| CN201710834400.6A CN107526702B (en) | 2017-09-15 | 2017-09-15 | USB interface circuit of mobile terminal and mobile terminal with same |
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| CN201710834400.6A CN107526702B (en) | 2017-09-15 | 2017-09-15 | USB interface circuit of mobile terminal and mobile terminal with same |
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| CN107526702B true CN107526702B (en) | 2023-12-05 |
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| CN108521035A (en) * | 2018-03-28 | 2018-09-11 | 努比亚技术有限公司 | The connection structure of mobile terminal and its universal serial bus connector |
| CN108957168A (en) * | 2018-05-22 | 2018-12-07 | 南昌华勤电子科技有限公司 | Usb circuit and electronic equipment comprising it |
| CN110943279B (en) * | 2018-09-25 | 2023-04-07 | 中兴通讯股份有限公司 | Method, device, equipment and storage medium for improving antenna efficiency of mobile terminal |
| CN113393599A (en) * | 2021-06-07 | 2021-09-14 | 深圳市伊格鲁科技有限公司 | Intelligent door lock capable of being controlled remotely and communication method thereof |
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