CN110994204A - External antenna circuit and external antenna device - Google Patents
External antenna circuit and external antenna device Download PDFInfo
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- CN110994204A CN110994204A CN201911395290.3A CN201911395290A CN110994204A CN 110994204 A CN110994204 A CN 110994204A CN 201911395290 A CN201911395290 A CN 201911395290A CN 110994204 A CN110994204 A CN 110994204A
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- thermistor
- antenna
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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
- H01—ELECTRIC ELEMENTS
- H01Q—ANTENNAS, i.e. RADIO AERIALS
- H01Q1/00—Details of, or arrangements associated with, antennas
- H01Q1/36—Structural form of radiating elements, e.g. cone, spiral, umbrella; Particular materials used therewith
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01Q—ANTENNAS, i.e. RADIO AERIALS
- H01Q1/00—Details of, or arrangements associated with, antennas
- H01Q1/48—Earthing means; Earth screens; Counterpoises
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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
- H01Q19/00—Combinations of primary active antenna elements and units with secondary devices, e.g. with quasi-optical devices, for giving the antenna a desired directional characteristic
- H01Q19/10—Combinations of primary active antenna elements and units with secondary devices, e.g. with quasi-optical devices, for giving the antenna a desired directional characteristic using reflecting surfaces
- H01Q19/104—Combinations of primary active antenna elements and units with secondary devices, e.g. with quasi-optical devices, for giving the antenna a desired directional characteristic using reflecting surfaces using a substantially flat reflector for deflecting the radiated beam, e.g. periscopic antennas
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01Q—ANTENNAS, i.e. RADIO AERIALS
- H01Q5/00—Arrangements for simultaneous operation of antennas on two or more different wavebands, e.g. dual-band or multi-band arrangements
- H01Q5/20—Arrangements for simultaneous operation of antennas on two or more different wavebands, e.g. dual-band or multi-band arrangements characterised by the operating wavebands
- H01Q5/28—Arrangements for establishing polarisation or beam width over two or more different wavebands
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01Q—ANTENNAS, i.e. RADIO AERIALS
- H01Q5/00—Arrangements for simultaneous operation of antennas on two or more different wavebands, e.g. dual-band or multi-band arrangements
- H01Q5/30—Arrangements for providing operation on different wavebands
- H01Q5/307—Individual or coupled radiating elements, each element being fed in an unspecified way
Abstract
The application provides an external antenna circuit, this circuit includes: the thermistor is connected with a first end of a first capacitor C1, a second end of the first capacitor C1 is connected with a first end of a second capacitor C2, and a second end of the second capacitor C2 is connected with a terminal peripheral interface, wherein a second end of the first capacitor C1 is connected with a first end of the thermistor, a first end of the discharge tube and a first end of the inductor L; one end of a voltage stabilizing source is connected with one end of a preset resistor R1, the other end of the preset resistor R1 is connected with the first end of an inductor L, the second end of the inductor L is connected with the first capacitor C1, the thermistor and the common end of the discharge tube, the second end of the thermistor is grounded, and the second end of the discharge tube is grounded; and the voltage acquisition device is connected with the preset resistor R1 and the common end of the inductor L. According to the scheme, the temperature detection and lightning protection functions can be provided for the antenna on the premise of realizing the antenna communication function.
Description
Technical Field
The application relates to the technical field of antennas, in particular to an external antenna circuit and an external antenna device.
Background
An antenna (antenna) is a transducer that converts a guided wave propagating on a transmission line into an electromagnetic wave propagating in an unbounded medium, usually free space, or vice versa. With the rapid development of communication technology, various wireless communication devices appear in succession, and the antenna is used as the guarantee that various communication devices carry out normal communication, and the use effect of the wireless communication devices and the use experience of users are influenced by the function and the appearance size of the antenna.
At present, many communication devices use external antennas, and the types of the external antennas are increasing, such as a magnet-attracted type sucker antenna, a rod-shaped adhesive stick antenna, or a gum-attracted type patch antenna, but these external antennas only achieve the communication function of the antenna, and the function is relatively single.
Disclosure of Invention
The embodiment of the application provides an external antenna circuit and an external antenna device, which can provide the functions of detecting the ambient temperature and preventing lightning for the antenna device on the premise of realizing the antenna communication function, and provide more convenience for users.
In a first aspect, an embodiment of the present application provides an external antenna circuit, including: the device comprises a thermistor, a first capacitor C1, a second capacitor C2, a voltage stabilizing source, a preset resistor R1, an inductor L, the thermistor, a voltage acquisition device and a discharge tube;
the thermistor is connected with a first end of the first capacitor C1, a second end of the first capacitor C1 is connected with a first end of the second capacitor C2, and a second end of the second capacitor C2 is connected with a terminal peripheral interface, wherein a second end of the first capacitor C1 is connected with a first end of the thermistor, a first end of the discharge tube and a first end of the inductor L;
one end of the voltage stabilizing source is connected with one end of the preset resistor R1, the other end of the preset resistor R1 is connected with the first end of the inductor L, the second end of the inductor L is connected with the first capacitor C1, the thermistor and the common end of the discharge tube, the second end of the thermistor is grounded, and the second end of the discharge tube is grounded;
the voltage acquisition device is connected with the preset resistor R1 and the common end of the inductor L;
the discharge tube is used for protecting the terminal under the condition of lightning overvoltage;
the current input by the voltage stabilizing source flows into the ground through the preset resistor R1, the inductor L and the thermistor;
the voltage acquisition device is used for acquiring sampling voltage of a common end of the preset resistor R1 and the inductor L, sending the sampling voltage to the terminal, and displaying the temperature of the thermistor through the terminal display screen, wherein the temperature of the thermistor is calculated by the terminal according to the sampling voltage;
under the condition that the thermistor is a Positive Temperature Coefficient (PTC) resistor, the higher the temperature of the thermistor is, the higher the resistance value of the thermistor is, and the larger the sampling voltage is; under the condition that the thermistor is a negative temperature coefficient NTC resistor, the higher the temperature of the thermistor is, the lower the resistance value of the thermistor is, and the smaller the sampling voltage is.
In a possible embodiment, the voltage acquisition means comprise an analog-to-digital converter ADC.
In one possible embodiment, the thermistor is an NTC resistor.
In a possible embodiment, the circuit further comprises a third capacitor C3;
one end of the third capacitor C3 is connected to the common end of the regulator and the preset resistor R1, and the other end of the third capacitor C3 is grounded.
It can be seen from above-mentioned circuit that the external antenna circuit that this application provided has still increased discharge tube and thermistor etc. in antenna circuit under the prerequisite of the communication function of assurance antenna for increase lightning protection function and detect the temperature function on the antenna, provide more antenna functions for the user, optimize user experience.
In a second aspect, an embodiment of the present application provides an external antenna device, where the external antenna device includes: the antenna comprises an antenna body, a shell, a radio frequency wire and a connector, wherein the antenna body is accommodated in the shell, the radio frequency wire penetrates through the shell, one end of the radio frequency wire is connected with the antenna main body, the other end of the radio frequency line, which is far away from the antenna main body, is connected with the connector, the antenna main body comprises a Printed Circuit Board (PCB), a reflecting layer, a first connecting piece, a second connecting piece and an antenna radiating body, the PCB is provided with the external antenna circuit described in any one of the circuits of the first aspect, the reflecting layer is connected and laminated with the PCB, the antenna radiator is arranged on one side of the reflecting layer, which is far away from the PCB, the antenna radiator and the reflecting layer are arranged at intervals, two ends of the first connecting piece which are deviated from each other are respectively connected with the antenna radiator and the reflecting layer, and two ends of the second connecting piece, which deviate from each other, are respectively connected to the antenna radiator and the external antenna circuit.
In a possible embodiment, the external antenna circuit is disposed on a side of the PCB board close to the reflective layer, the reflective layer has an opening, and the external antenna circuit is disposed in the opening.
In a possible embodiment, the antenna radiator includes a first functional portion and a second functional portion connected to the first functional portion, the first functional portion is U-shaped, the first functional portion is connected to the first connecting member in a bent manner, and the second functional portion is connected to the second connecting member in a bent manner.
In a possible embodiment, the antenna radiator further includes a third functional portion, the third functional portion includes a first loop portion and a T-shaped portion connected to the first loop portion in a bent manner, the first loop portion is connected to the second functional portion in a bent manner, and the third functional portion is F-shaped.
In a possible embodiment, the antenna radiator further includes a fourth functional portion, where the fourth functional portion includes a second annular portion and a strip portion connected to the second annular portion in a bent manner, and the second annular portion is connected to the T-shaped portion in a bent manner.
In a possible embodiment, the external antenna device further includes a magnetic component, and the magnetic component is disposed on a side of the PCB board away from the reflective layer.
It can be seen that, the PIFA antenna is composed of the antenna radiator, the first connector, the second connector, and the reflective layer, and full-band coverage can be achieved after the antenna radiator, the first connector, and the second connector are set and debugged reasonably. And, this application still has guaranteed under the prerequisite of better antenna performance, sets up the external antenna circuit that has lightning protection function and detect the temperature function in the opening of reflector layer, provides more antenna function for the user, optimizes user experience. In addition, the external antenna device can be designed to be very small in size, has a high camouflage effect and good concealment, and can be intercommunicated and used on various wireless communication terminals.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings needed to be used in the description of the embodiments are briefly introduced below, and it is obvious that the drawings in the following description are some embodiments of the present application, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without creative efforts.
Fig. 1 is a schematic structural diagram of an external antenna circuit according to an embodiment of the present disclosure;
fig. 2 is a schematic structural diagram of another external antenna circuit according to an embodiment of the present disclosure;
fig. 3 is a schematic overall structure diagram of an external antenna device according to an embodiment of the present disclosure;
fig. 4 is a schematic structural diagram of an antenna main body according to an embodiment of the present application;
fig. 5 is a schematic diagram of a PIFA antenna provided by an embodiment of the present application;
fig. 6 is a standing wave ratio test chart of an external antenna device according to an embodiment of the present application.
Detailed Description
The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application, and it is obvious that the described embodiments are some, but not all, embodiments of the present application. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present application.
The terms "first," "second," and the like in the description and claims of the present application and in the above-described drawings are used for distinguishing between different objects and not for describing a particular order. Furthermore, the terms "include" and "have," as well as any variations thereof, are intended to cover non-exclusive inclusions. For example, a process, method, system, article, or apparatus that comprises a list of steps or elements is not limited to only those steps or elements listed, but may alternatively include other steps or elements not listed, or inherent to such process, method, article, or apparatus.
It will be understood that the terms "comprises" and/or "comprising," when used in this specification and the appended claims, specify the presence of stated features, integers, steps, operations, elements, and/or components, but do not preclude the presence or addition of one or more other features, integers, steps, operations, elements, components, and/or groups thereof.
It is also to be understood that the terminology used in the description of the present application herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the application. As used in the specification of the present application and the appended claims, the singular forms "a," "an," and "the" are intended to include the plural forms as well, unless the context clearly indicates otherwise.
It should be further understood that the term "and/or" as used in this specification and the appended claims refers to and includes any and all possible combinations of one or more of the associated listed items.
For facilitating understanding of the embodiments of the present application, a description is first given to main application scenarios related to the embodiments of the present application, so as to facilitate understanding of those skilled in the art.
In recent years, with the rapid development of communication technology, various wireless communication terminals (such as routers, cameras, network set-top boxes and other electronic products) appear in succession, and the antenna is used as a guarantee for normal communication of various communication terminals, and the antenna function will affect the use effect of the wireless communication terminal and the use experience of users.
At present, external antenna devices on the market are various in types, and include a screw antenna or a suction cup antenna of a magnet adsorption type, a glue stick antenna of a rod structure, a patch antenna of a gum adsorption type, a ceramic dielectric antenna dedicated for positioning, and the like. However, these external antennas only realize the communication function of the antenna, do not provide diversified functions such as temperature detection and lightning protection for users, have single function and poor user experience, and the existing external antenna device has large structural size and poor concealment, is installed in a place where people flow and is easy to be knocked by people.
To the function that above-mentioned current external antenna device exists than single, the structure size is big, disguise not good scheduling problem, this application embodiment provides an external antenna circuit and external antenna device, this antenna circuit and antenna device can provide the function of detecting ambient temperature and lightning protection for the antenna, the temperature under the current environment that will detect the acquisition shows through the terminal, the user of being convenient for learns current temperature, the lightning protection function can avoid the terminal to suffer the thunderbolt, protect the terminal. In addition, the external antenna device that this application provided is whole less in size, has high camouflage effect, and the disguise is good, can intercommunicate and interuse on multiple wireless communication terminal.
Next, the external antenna circuit and the external antenna device provided in the embodiments of the present application are described in detail.
Referring to fig. 1, fig. 1 is a diagram of an external antenna circuit according to an embodiment of the present disclosure, and as shown in fig. 1, the external antenna circuit may include: the device comprises a thermistor, a first capacitor C1, a second capacitor C2, a voltage stabilizing source, a preset resistor R1, an inductor L, the thermistor, a voltage acquisition device and a discharge tube.
In the circuit, the thermistor is connected with a first end of a first capacitor C1, a second end of the first capacitor C1 is connected with a first end of a second capacitor C2, a second end of the second capacitor C2 is connected with a terminal peripheral interface, and a second end of the first capacitor C1 is connected with a first end of the thermistor, a first end of the discharge tube and a first end of the inductor L.
In the circuit, one end of a voltage stabilizing source is connected with one end of a preset resistor R1, the other end of the preset resistor R1 is connected with a first end of an inductor L, a second end of the inductor L is connected with a common end of a first capacitor C1, a thermistor and a discharge tube, a second end of the thermistor is grounded, and a second end of the discharge tube is grounded.
In the circuit, a voltage acquisition device is connected with a preset resistor R1 and the common end of an inductor L.
In a particular embodiment of the present application, the antenna terminal, for receiving and transmitting electromagnetic wave signals, converts a guided wave propagating on a transmission line into an electromagnetic wave propagating in an unbounded medium (usually free space), or vice versa. And a discharge tube for protecting the terminal in the case of lightning overvoltage. It will be appreciated that the discharge tube may also protect other components in the antenna circuit. Specifically, under the condition of lightning overvoltage, the discharge tube breaks down and discharges to approximate a short circuit, lightning current mainly flows to the ground through the discharge tube to be discharged, and the first capacitor C1 and the second capacitor C2 can block a very small amount of lightning current which is not discharged through the discharge tube, so that the thermistor, the terminal and other elements in the circuit are protected.
In the specific embodiment of the application, the current input by the voltage regulator passes through the preset resistor R1, the inductor L and the thermistor and flows into the ground. The preset resistor R1 and the thermistor form series voltage division, the resistance value of the preset resistor R1 is a fixed value, the resistance value of the thermistor is a variable value, the voltage division values at different temperatures are different, the voltage acquisition device can acquire the voltage division value of the thermistor, namely sampling voltage, then the sampling voltage is sent to the terminal, the terminal can calculate the resistance value of the thermistor according to the sampling voltage, and the temperature of the thermistor is determined according to the resistance value of the thermistor.
Specifically, the terminal can calculate the resistance value of the thermistor under the current environment according to the linear proportional relation between the resistor and the voltage in the series circuit. Namely, the ratio of the sum of the resistance values of the preset resistor R1 and the thermistor to the resistance value of the thermistor is equal to the ratio of the voltage value provided by the voltage stabilizing source to the sampling voltage. Since the preset resistor R1, the voltage value provided by the voltage regulator and the sampling voltage are known, the resistance value of the thermistor can be calculated. And reading out the temperature value of the thermistor in the current environment according to the corresponding relation between the resistance and the temperature of the thermistor, and displaying the temperature through a terminal display screen.
In a more specific embodiment, the voltage acquisition device may include an Analog-to-digital converter (ADC) that samples the voltage-divided signal of the thermistor to obtain discrete sampled voltages, and may use binary numbers to represent each discrete voltage value. Further, the sampling voltage can be converted into a corresponding digital signal according to the corresponding relationship between the sampling voltage and the bit. The sampled voltage may correspond to a different number of bits, e.g., the sampled voltage may correspond to 4 bits or 8 bits. Different bit values correspond to different sampled voltages. For example, the sampling voltage may be represented by a four-digit binary number 0010 as 2V, or by a four-digit binary number 0001 as 1V, and the like, which is not particularly limited herein.
In a specific embodiment of the present application, the regulated voltage source may be an LDO, which is a low dropout linear regulator that uses a transistor or Field Effect Transistor (FET) operating in its saturation region to subtract excess voltage from the applied input voltage to produce a regulated output voltage. The voltage supplied by the voltage regulator may be 3.3V or 5V, and the like, and is not limited herein. The thermistor may be a Positive Temperature Coefficient (PTC) resistor and a Negative Temperature Coefficient (NTC) resistor, and is not particularly limited herein. It can be understood that, in the case that the thermistor is a PTC resistor, the higher the temperature of the thermistor is, the higher the resistance value of the thermistor is, the larger the sampling voltage is; in the case where the thermistor is an NTC resistor, the higher the temperature of the thermistor is, the lower the resistance value of the thermistor is, and the smaller the sampling voltage is. Preferably, an NTC thermistor is used in the embodiment of the present application.
In addition, as can be seen from the above embodiments, the first capacitor C1 and the second capacitor C2 can also block the current input by the regulator, so as to prevent the current from flowing to the antenna end and the terminal, which may cause interference to signals at the antenna end and the terminal, and affect the normal operation of the antenna end and the terminal. As can be seen from the above circuit, the inductor L and the second capacitor C2 also form an LC filter circuit, which performs a filtering function.
In a more specific embodiment, the circuit may further include a third capacitor C3, as shown in fig. 2, fig. 2 is a schematic structural diagram of another external antenna circuit provided in the embodiment of the present application, in fig. 2, one end of the third capacitor C3 is connected to the common terminal of the voltage regulator and the preset resistor R1, the other end of the third capacitor C3 is grounded, and the third capacitor is mainly used for filtering.
In practical application, the terminal connected to the antenna circuit may be an electronic product such as a router, a camera, a network set-top box, a vehicle-mounted device with a WIFI module, and the terminal peripheral interface may be a Radio Frequency-port (RF-port), and the like, and is not limited specifically here.
It can be seen from the above embodiment that the external antenna circuit that this application provided has still increased discharge tube and thermistor etc. in antenna circuit under the prerequisite of the communication function of assurance antenna for increase lightning protection function and detect the temperature function on the antenna, provide more antenna functions for the user, optimize user experience.
The embodiment of the application further provides an external antenna device, and the external antenna device can be suitable for electronic products such as routers, cameras, network set top boxes and vehicle-mounted devices with WIFI modules, and is not limited specifically here.
Please refer to fig. 3 and fig. 4 together, in which fig. 3 is a schematic diagram of an overall structure of an external antenna device according to an embodiment of the present application, and fig. 4 is a schematic diagram of a structure of an antenna body according to an embodiment of the present application.
As shown in fig. 3 and 4, the external antenna device according to the embodiment of the present application includes: the antenna comprises an antenna body 100, a housing 200, a radio frequency line 300 and a connector 400, wherein the antenna body 100 is accommodated in the housing 200, the radio frequency line 300 penetrates through the housing 200, one end of the radio frequency line 300 is connected to the antenna body 100, the other end of the radio frequency line 300, which is far away from the antenna body 100, is connected to the connector 400, the antenna body 100 comprises a Printed Circuit Board (PCB) 110, a reflecting layer 120, a first connecting piece 130, a second connecting piece 140 and an antenna radiator 150, the PCB 110 is provided with the external antenna Circuit 160 according to the above Circuit embodiment, the reflecting layer 120 is connected and stacked on the PCB 110, the antenna radiator 150 is arranged on one side of the reflecting layer 120, which is far away from the PCB 110, the antenna radiator 150 and the reflective layer 120 are disposed at an interval, two ends of the first connector 130 facing away from each other are respectively connected to the antenna radiator 150 and the reflective layer 120, and two ends of the second connector 140 facing away from each other are respectively connected to the antenna radiator 150 and the external antenna circuit 160.
In the above embodiment, the first connector 130 and the second connector 140 can better support and stabilize the antenna radiator 150, so that the antenna radiator 150 is not easily deformed when being subjected to a pressure.
In a specific embodiment of the present invention, the external antenna circuit 160 of the above circuit embodiment may be disposed on a side of the PCB 110 close to the reflective layer 120, the reflective layer 120 has an opening, and the external antenna circuit 160 is disposed in the opening. The external antenna circuit 160 includes a first capacitor 161, a discharge tube 162, a thermistor 163, and the like, and the circuit connection relationship in the external antenna circuit may specifically refer to the description of the above circuit embodiment, and details are not repeated here. The external antenna circuit is arranged in the opening of the reflecting layer, so that the external antenna circuit 160 is integrated on the antenna device, a lightning protection function and a temperature detection function are provided for the antenna device, the external antenna circuit 160 occupies a smaller space, and the miniaturization of the external antenna device is not influenced.
In addition, it can be seen from the above embodiments that the antenna radiator 150, the first connector 130, the second connector 140, and the reflective layer 120 together form a PIFA antenna, which implements the communication function of the antenna.
As shown in fig. 5, fig. 5 is a schematic diagram of a PIFA antenna including an open-ended transmission line 1 and a short-ended transmission line 2, a first connection line 3 and a second connection line 4. One end of the first connecting line 3 is connected to one end of the open-ended transmission line 1, and the other end of the first connecting line 3 is a grounding point 7 for connecting the ground 5; one end of the second connecting line 4 is connected between the open-ended transmission line 1 and the short-ended transmission line 2, and the other end thereof is a feeding point 8 for inputting radio frequency energy. Typically, PIFA antennas are also provided with a reflective surface 6 for reflecting radiation towards the transmission line 1.
It can be seen that the first connection element 130 in the present application corresponds to the first connection line 3 in fig. 5, one end of the first connection element 130 connected to the reflective layer 120 corresponds to the grounding point 7 in fig. 5, the second connection element 140 corresponds to the second connection line 4 in fig. 5, one end of the second connection element 140 connected to the external antenna circuit 160 corresponds to the feeding point 8 in fig. 5, a portion of the antenna radiator 150 located between the first connection element 130 and the second connection element 140 corresponds to the short-circuited transmission line 2 in fig. 5, a portion of the antenna radiator 150 located outside the first connection element 130 and the second connection element 140 corresponds to the open-ended transmission line 1, and the reflective layer 120 corresponds to the reflective surface 6 in fig. 5 for reflecting radiation to the antenna radiator 150.
In the above embodiment, the scheme that the antenna radiator 150, the first connecting member 130, the second connecting member 140, and the reflective layer 120 jointly form the PIFA antenna is described, in practical application, the first connecting member 130 and the second connecting member 140 may be steel sheets, the antenna radiator 150 may be a PCB antenna, the PCB antenna occupies a small volume, the signal strength is high, the reflective layer 120 may be made of a copper sheet material, only an opening with a small area is reserved for arranging the external antenna circuit 160, so that the antenna radiator 150 realizes radiation coverage with a large angle, and the copper sheet material is favorable for high gain, low standing wave, and good uniformity of radiation signals. It is understood that the reflective layer 120 may be made of other materials as needed, and is not limited thereto.
In an embodiment of the present invention, the antenna radiator 150 includes a first functional portion 151 and a second functional portion 152 connected to the first functional portion, the first functional portion 151 is U-shaped, the first functional portion 151 is connected to the first connecting member 130 in a bent manner, and the second functional portion 152 is connected to the second connecting member 140 in a bent manner. The antenna radiator 150 further includes a third functional portion 153, the third functional portion 153 includes a first annular portion and a T-shaped portion connected to the first annular portion in a bent manner, the first annular portion is connected to the second functional portion 152 in a bent manner, and the third functional portion 153 is F-shaped. The antenna radiator 150 further includes a fourth functional portion 154, where the fourth functional portion 154 includes a second annular portion and a strip portion connected to the second annular portion in a bent manner, and the second annular portion is connected to the T-shaped portion in a bent manner.
The shape design of the first functional unit 151, the second functional unit, the third functional unit, and the fourth functional unit and the connection relationship between the four units, the connection positions of the first connecting member 130 and the second connecting member 140 described in the above embodiments can determine: the first functional portion 151 and the third functional portion 153 mainly control the performance of the antenna device in the high frequency band (2300-.
The data of the radiation efficiency and the maximum gain of the antenna device provided in this embodiment measured by experiments along with the variation of the operating frequency are shown in table 1:
TABLE 1
| Frequency (MHZ) | Efficiency (%) | Gain (dBi) | Frequency (MHZ) | Efficiency (%) | Gain (dBi) |
| 820 | 23.75 | -0.03 | 1990 | 28.07 | 0.63 |
| 880 | 47.78 | 1.80 | 2170 | 25.87 | 1.77 |
| 960 | 45.60 | 2.70 | 2300 | 24.28 | 0.53 |
| 1710 | 17.05 | -0.20 | 2500 | 37.28 | 1.74 |
| 1880 | 34.30 | 1.73 | 2690 | 33.10 | 1.30 |
As can be seen from table 1, the antenna in this embodiment can cover 824-2690MHz, and can completely meet the requirements of the conventional external antenna; fig. 5 is a standing wave ratio test chart of the external antenna device provided in this embodiment, and as can be seen from fig. 5, the voltage standing wave ratio of the external antenna device is below 2.24, and the antenna can meet the antenna operation design requirement.
In a specific embodiment of the present invention, the external antenna device may further include a magnetic member 500, where the magnetic member 500 is disposed on a side of the PCB 110 away from the reflective layer 120. In practical applications, the magnetic member 500 may be an adsorbing member made of a magnetic material, such as a fixed magnet, for increasing the adsorbing force between the external antenna device and the metal object, and improving the phenomenon that the external antenna device is loosened and slides off after being used for a long time.
In practical applications, the rf cable 300 may be an RG174 rf cable with reduced cable attenuation and high shielding performance. The connector 400 may be an SMA connector, and the type of the connector may be set according to needs, and the connector 400 may be fixed to the terminal peripheral interface by means of screwing or clamping, and the like, which is not limited specifically herein.
It can be seen from the above embodiments that the PIFA antenna is formed by using the antenna radiator, the first connector, the second connector, and the reflective layer, and after the antenna radiator, the first connector, and the second connector are set and debugged reasonably, full-band coverage can be achieved. And, this application still has guaranteed under the prerequisite of better antenna performance, sets up the external antenna circuit that has lightning protection function and detect the temperature function in the opening of reflector layer, provides more antenna function for the user, optimizes user experience. In addition, the external antenna device can be designed to be very small in size, has a high camouflage effect and good concealment, and can be intercommunicated and used on various wireless communication terminals.
While the invention has been described with reference to specific embodiments, the scope of the invention is not limited thereto, and those skilled in the art can easily conceive various equivalent modifications or substitutions within the technical scope of the invention. Therefore, the protection scope of the present application shall be subject to the protection scope of the claims.
Claims (10)
1. An external antenna circuit, comprising: the device comprises a thermistor, a first capacitor C1, a second capacitor C2, a voltage stabilizing source, a preset resistor R1, an inductor L, the thermistor, a voltage acquisition device and a discharge tube;
the thermistor is connected with a first end of the first capacitor C1, a second end of the first capacitor C1 is connected with a first end of the second capacitor C2, and a second end of the second capacitor C2 is connected with a terminal peripheral interface, wherein a second end of the first capacitor C1 is connected with a first end of the thermistor, a first end of the discharge tube and a first end of the inductor L;
one end of the voltage stabilizing source is connected with one end of the preset resistor R1, the other end of the preset resistor R1 is connected with the first end of the inductor L, the second end of the inductor L is connected with the first capacitor C1, the thermistor and the common end of the discharge tube, the second end of the thermistor is grounded, and the second end of the discharge tube is grounded;
the voltage acquisition device is connected with the preset resistor R1 and the common end of the inductor L;
the discharge tube is used for protecting the thermistor and the terminal under the condition of lightning overvoltage;
the current input by the voltage stabilizing source flows into the ground through the preset resistor R1, the inductor L and the thermistor;
the voltage acquisition device is used for acquiring sampling voltage of a common end of the preset resistor R1 and the inductor L, sending the sampling voltage to the terminal, and displaying the temperature of the thermistor through the terminal display screen, wherein the temperature of the thermistor is calculated by the terminal according to the sampling voltage;
under the condition that the thermistor is a Positive Temperature Coefficient (PTC) resistor, the higher the temperature of the thermistor is, the higher the resistance value of the thermistor is, and the larger the sampling voltage is; under the condition that the thermistor is a negative temperature coefficient NTC resistor, the higher the temperature of the thermistor is, the lower the resistance value of the thermistor is, and the smaller the sampling voltage is.
2. The circuit of claim 1, wherein the voltage acquisition device comprises an analog-to-digital converter (ADC).
3. The circuit of claim 1, wherein the thermistor is an NTC resistor.
4. A circuit according to any of claims 1 to 3, further comprising a third capacitor C3;
one end of the third capacitor C3 is connected to the common end of the regulator and the preset resistor R1, and the other end of the third capacitor C3 is grounded.
5. An external antenna device, comprising: the antenna comprises an antenna body, a shell, a radio frequency wire and a connector, wherein the antenna body is accommodated in the shell, the radio frequency wire penetrates through the shell, one end of the radio frequency wire is connected with the antenna main body, the other end of the radio frequency line, which is far away from the antenna main body, is connected with the connector, the antenna main body comprises a Printed Circuit Board (PCB), a reflecting layer, a first connecting piece, a second connecting piece and an antenna radiating body, the PCB is provided with the external antenna circuit of any one of claims 1 to 4, the reflecting layer is connected and arranged on the PCB in a laminated mode, the antenna radiator is arranged on one side, away from the PCB, of the reflecting layer, the antenna radiator and the reflecting layer are arranged at intervals, two ends of the first connecting piece which are deviated from each other are respectively connected with the antenna radiator and the reflecting layer, and two ends of the second connecting piece, which deviate from each other, are respectively connected to the antenna radiator and the external antenna circuit.
6. The device of claim 5, wherein the external antenna circuit is disposed on a side of the PCB board adjacent to the reflective layer, the reflective layer having an opening, the external antenna circuit being disposed in the opening.
7. The apparatus of claim 5, wherein the antenna radiator comprises a first functional portion and a second functional portion connected to the first functional portion, the first functional portion is U-shaped, the first functional portion is connected to the first connecting member in a bent manner, and the second functional portion is connected to the second connecting member in a bent manner.
8. The apparatus of claim 7, wherein the antenna radiator further comprises a third functional portion, the third functional portion comprises a first loop portion and a T-shaped portion connected to the first loop portion in a bent manner, the first loop portion is connected to the second functional portion in a bent manner, and the third functional portion is F-shaped.
9. The apparatus of claim 8, wherein the antenna radiator further comprises a fourth functional portion, and the fourth functional portion comprises a second annular portion and a strip portion connected to the second annular portion in a bent manner, and the second annular portion is connected to the T-shaped portion in a bent manner.
10. The device as claimed in claim 5, wherein the external antenna device further comprises a magnetic member, and the magnetic member is disposed on a side of the PCB board away from the reflective layer.
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| CN201911395290.3A CN110994204B (en) | 2019-12-30 | 2019-12-30 | External antenna circuit and external antenna device |
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| CN201911395290.3A CN110994204B (en) | 2019-12-30 | 2019-12-30 | External antenna circuit and external antenna device |
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| CN110994204B CN110994204B (en) | 2021-05-18 |
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| CN110994204B (en) | 2021-05-18 |
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