CN211478622U - Mobile terminal and automatic detection circuit of built-in antenna thereof - Google Patents
Mobile terminal and automatic detection circuit of built-in antenna thereof Download PDFInfo
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- CN211478622U CN211478622U CN201922499197.9U CN201922499197U CN211478622U CN 211478622 U CN211478622 U CN 211478622U CN 201922499197 U CN201922499197 U CN 201922499197U CN 211478622 U CN211478622 U CN 211478622U
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Abstract
The utility model discloses an automatic detection circuit of a mobile terminal and a built-in antenna thereof, which comprises a power supply, a first resistor, a second resistor, a third resistor and a CPU; the negative electrode of the power supply is grounded, the positive electrode of the power supply is electrically connected with one end of the second resistor, the other end of the second resistor is electrically connected with one end of the first resistor and one end of the third resistor respectively, the other end of the third resistor is electrically connected with the CPU, the other end of the first resistor is electrically connected with a feed point of the built-in antenna, and a short-circuit point of the built-in antenna is grounded; the CPU is used for carrying out voltage detection on the received input signal of the power supply. The utility model discloses a CPU voltage detection judges the contact condition of antenna feed point, has avoided bad terminal product to flow into market, also avoids influencing communication quality simultaneously, has improved user experience nature.
Description
Technical Field
The utility model relates to an antenna detection field, in particular to mobile terminal and built-in antenna's automated inspection circuit thereof.
Background
Most mobile terminals in the market adopt built-in PIFA (planar inverted F-shaped) antennas, when the whole machine is assembled, most of the existing methods are manual networking test after the whole machine is assembled, and the antenna assembly is considered to be normal if the terminal can register a network.
The manual networking test method has great hidden danger, if the network signal is good, the terminal can directly register the network without receiving some signals through the antenna, but the call is interrupted.
Therefore, the manual networking test method cannot avoid the distribution of terminals without antennas or antennas that are not completely assembled to the market.
SUMMERY OF THE UTILITY MODEL
The to-be-solved technical problem of the utility model is to provide a mobile terminal and built-in antenna's automated inspection circuit in order to overcome the defect that can't carry out effective detection to mobile terminal built-in antenna's equipment condition among the prior art.
The utility model discloses an above-mentioned technical problem is solved through following technical scheme:
an automatic detection circuit of a built-in antenna of a mobile terminal comprises a power supply, a first resistor, a second resistor, a third resistor and a CPU (central processing unit);
the negative electrode of the power supply is grounded, the positive electrode of the power supply is electrically connected with one end of the second resistor, the other end of the second resistor is electrically connected with one end of the first resistor and one end of the third resistor respectively, the other end of the third resistor is electrically connected with the CPU, the other end of the first resistor is electrically connected with a feed point of the built-in antenna, and a short-circuit point of the built-in antenna is grounded;
the CPU is used for carrying out voltage detection on the received input signal of the power supply.
Preferably, the resistance of the first resistor is 10k Ω, and the resistances of the second resistor and the third resistor are both 100k Ω.
Preferably, the voltage value of the power supply is 3V.
Preferably, the automatic detection circuit further comprises an inductor;
the other end of the first resistor is electrically connected with one end of the inductor, and the other end of the inductor is electrically connected with a feed point of the built-in antenna through a radio frequency microstrip line.
Preferably, the inductance value of the inductor is 45 nH.
Preferably, the mobile terminal further comprises a radio frequency module, and the automatic detection circuit further comprises a capacitor;
one end of the capacitor is electrically connected with the radio frequency module through the radio frequency microstrip line, and the other end of the capacitor is electrically connected with the other end of the inductor.
Preferably, the capacitance value of the capacitor is 100 pF.
Preferably, the CPU includes a GPIO (input output) port through which the CPU receives a power supply signal.
A mobile terminal comprises the automatic detection circuit.
The utility model discloses an actively advance the effect and lie in:
the utility model discloses a mobile terminal and built-in antenna's automated inspection circuit detects the contact condition who judges the antenna feed point through CPU voltage, has avoided bad terminal product to flow into market, also avoids influencing communication quality simultaneously, has improved user experience nature.
Drawings
Fig. 1 is a circuit diagram of an automatic detection circuit of a built-in antenna of a mobile terminal according to an embodiment of the present invention.
Detailed Description
The present invention will be more clearly and completely described below by way of embodiments with reference to the accompanying drawings, and the description of the embodiments is provided to help understanding the present invention, but the present invention is not limited thereto.
As shown in fig. 1, an automatic detection circuit for a mobile terminal and a built-in antenna thereof includes a power supply VDD, a first resistor R1, a second resistor R2, a third resistor R3, a CPU, an inductor L1, and a capacitor C1;
the negative electrode of the power supply VDD is grounded, the positive electrode of the power supply VDD is electrically connected with one end of the second resistor R2, the other end of the second resistor R2 is electrically connected with one end of the first resistor R1 and one end of the third resistor R3 respectively, the other end of the third resistor R3 is electrically connected with a GPIO port of the CPU, the CPU detects the voltage of an input signal of the power supply VDD received by the GPIO port, the voltage value of the power supply VDD is 3V, the resistance value of the first resistor R1 is 10k omega, and the resistance values of the second resistor R2 and the third resistor R3 are both 100k omega.
The other end of the first resistor R1 is electrically connected to one end of the inductor L1, the other end of the inductor L1 is electrically connected to the feeding point 1 of the internal PIFA antenna 3 through the radio frequency microstrip line 4, and the short-circuit point 2 of the internal PIFA antenna 3 is grounded.
One end of the capacitor C1 is electrically connected with the radio frequency module 6 through the radio frequency microstrip line 5, and the other end is electrically connected with the other end of the inductor L1.
In this embodiment, when the feeding point 1 of the PIFA antenna 3 is not in contact with the radio frequency microstrip line 4 or the contact is poor, the circuit between the feeding point 1 of the PIFA antenna 3 and the radio frequency microstrip line 4 is disconnected, and the input signal of the power supply VDD received by the CPU through the GPIO port is 3V.
When the feeding point 1 of the PIFA antenna 3 is in good contact with the radio frequency microstrip line 4, the direct current signal of the power supply VDD in the detection circuit is grounded through the second resistor R2, the first resistor R1, the inductor L1, the radio frequency microstrip line 4, the feeding point 1 of the PIFA antenna 3 and the short circuit point 2 of the PIFA antenna 3 to form a loop, and meanwhile, the loop is grounded through a formula
And calculating that the input signal of the power supply VDD received by the CPU through the GPIO port is less than 1V.
In this embodiment, the capacitance value of the capacitor C1 is 100pF and belongs to a large capacitor, the inductance value of the inductor L1 is 45nH and belongs to a large inductor, and since the large capacitor is an open-circuit device with respect to a dc signal and a short-circuit device with respect to a high-frequency signal and the large inductor is an open-circuit device with respect to the high-frequency signal, when the feed point 1 of the PIFA antenna 3 is in good contact with the radio frequency microstrip line 4, the capacitor C1 separates the dc signal of the detection circuit, preventing the dc signal from being input into the radio frequency module and interfering with the terminal signal; when the PIFA antenna 3 transmits a high frequency signal to the rf module 6, the inductor L1 isolates the high frequency signal to prevent the high frequency signal from entering the detection circuit, thereby avoiding affecting the detection result of the detection circuit.
Although specific embodiments of the present invention have been described above, it will be understood by those skilled in the art that this is by way of example only and that the scope of the invention is defined by the appended claims. Various changes and modifications to these embodiments may be made by those skilled in the art without departing from the spirit and the principles of the present invention, and these changes and modifications are all within the scope of the present invention.
Claims (9)
1. An automatic detection circuit of a built-in antenna of a mobile terminal is characterized by comprising a power supply, a first resistor, a second resistor, a third resistor and a CPU;
the negative electrode of the power supply is grounded, the positive electrode of the power supply is electrically connected with one end of the second resistor, the other end of the second resistor is electrically connected with one end of the first resistor and one end of the third resistor respectively, the other end of the third resistor is electrically connected with the CPU, the other end of the first resistor is electrically connected with a feed point of the built-in antenna, and a short-circuit point of the built-in antenna is grounded;
the CPU is used for carrying out voltage detection on the received input signal of the power supply.
2. The automatic detection circuit of claim 1, wherein the first resistor has a resistance of 10k Ω, and the second resistor and the third resistor each have a resistance of 100k Ω.
3. The automatic detection circuit of claim 1, wherein the voltage value of the power supply is 3V.
4. The automatic detection circuit of claim 1, wherein the automatic detection circuit further comprises an inductor;
the other end of the first resistor is electrically connected with one end of the inductor, and the other end of the inductor is electrically connected with a feed point of the built-in antenna through a radio frequency microstrip line.
5. The automatic detection circuit of claim 4, wherein the inductance value of the inductor is 45 nH.
6. The automatic detection circuit of claim 4, wherein the mobile terminal comprises a radio frequency module, the automatic detection circuit further comprising a capacitor;
one end of the capacitor is electrically connected with the radio frequency module through the radio frequency microstrip line, and the other end of the capacitor is electrically connected with the other end of the inductor.
7. The automatic detection circuit of claim 6, wherein the capacitance of the capacitor is 100 pF.
8. The automatic detection circuit of claim 1, wherein the CPU includes a GPIO port through which the CPU receives a power supply signal.
9. A mobile terminal characterized by comprising an automatic detection circuit according to any one of claims 1 to 8.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201922499197.9U CN211478622U (en) | 2019-12-31 | 2019-12-31 | Mobile terminal and automatic detection circuit of built-in antenna thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201922499197.9U CN211478622U (en) | 2019-12-31 | 2019-12-31 | Mobile terminal and automatic detection circuit of built-in antenna thereof |
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| CN211478622U true CN211478622U (en) | 2020-09-11 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201922499197.9U Active CN211478622U (en) | 2019-12-31 | 2019-12-31 | Mobile terminal and automatic detection circuit of built-in antenna thereof |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113655406A (en) * | 2021-08-12 | 2021-11-16 | 惠州Tcl云创科技有限公司 | RF coaxial cable connection detection circuit, detection method and mobile terminal |
| WO2022088920A1 (en) * | 2020-10-31 | 2022-05-05 | 华为技术有限公司 | Radio frequency system, electronic device, and computer readable storage medium |
-
2019
- 2019-12-31 CN CN201922499197.9U patent/CN211478622U/en active Active
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2022088920A1 (en) * | 2020-10-31 | 2022-05-05 | 华为技术有限公司 | Radio frequency system, electronic device, and computer readable storage medium |
| CN113655406A (en) * | 2021-08-12 | 2021-11-16 | 惠州Tcl云创科技有限公司 | RF coaxial cable connection detection circuit, detection method and mobile terminal |
| CN113655406B (en) * | 2021-08-12 | 2024-06-11 | 惠州Tcl云创科技有限公司 | RF coaxial cable connection detection circuit, detection method and mobile terminal |
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