CN204967801U - Antenna circuitry and mobile terminal - Google Patents
Antenna circuitry and mobile terminal Download PDFInfo
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- CN204967801U CN204967801U CN201520646275.2U CN201520646275U CN204967801U CN 204967801 U CN204967801 U CN 204967801U CN 201520646275 U CN201520646275 U CN 201520646275U CN 204967801 U CN204967801 U CN 204967801U
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Abstract
The utility model discloses an antenna circuitry and mobile terminal. Antenna circuitry includes: antenna, antenna include radiofrequency signal present a little with present a little, radiofrequency signal filter circuit, including parallelly connected each other first electric capacity and first inductance, the one end and the radiofrequency signal of first electric capacity present the point connection, and the other end is as the output, frequency modulation signal filtering circuit, including second to five inductance, second electric capacity and third electric capacity, second electric capacity and second inductance are parallelly connected each other, the point connection is presented on the one end and the ground of second electric capacity, the other end with the connection, the one end interconnect of the one end of third inductance, the one end of fourth inductance and the 5th inductance, the point connection is not presented with ground to the other end of third inductance, and the other end and the ground of fourth inductance are connected, the other end of the 5th inductance and the connection of the one end of third electric capacity, the other end of third electric capacity is as the output of frequency modulation signal filtering circuit. Assign the built -in antenna of mobile terminal as the antenna of receiving the FM broadcasting signal, realize not additional any annex and listen to FM broadcasting.
Description
Technical field
The utility model embodiment relates to circuit engineering, particularly relates to a kind of antenna circuit and mobile terminal.
Background technology
Nowadays, mobile terminal device is generally used by people, such as mobile phone, panel computer etc.Wherein, a lot of mobile terminal device all built-in frequency modulation (FM) radio function, and FM receiver function needs antenna receiving signal.
At home, the frequency range of FM receiver reception is generally between 85MHz to 108MHz.Receive the signal of this frequency band, the antenna length that broadcast receiver needs should at 90cm-110cm.Present common practice connects earphone listening in frequency modulation broadcast on the mobile terminal device, namely uses earphone as the antenna of Received signal strength.
As mobile terminal device, portability is very important, and must by the earphone broadcast listening reaching about 1 meter when using FM receiver function, and obviously not too convenient, Long-Time Service earphone also can cause burden to ear.
Utility model content
The utility model provides a kind of antenna circuit and mobile terminal, listening in frequency modulation broadcast when to realize not adding any annex.
First, the utility model embodiment provides a kind of antenna circuit, comprising:
Antenna, described antenna comprises radiofrequency signal feedback point and ground feedback point;
Radiofrequency signal filter circuit, comprises the first electric capacity parallel with one another and the first inductance, and one end of described first electric capacity is connected with described radiofrequency signal feedback point, and the other end is as the output of described radiofrequency signal filter circuit;
FM signal filter circuit, comprise the second inductance, the 3rd inductance, the 4th inductance, the 5th inductance, the second electric capacity and the 3rd electric capacity, described second electric capacity and described second inductance parallel with one another, one end of described second electric capacity to be connected with described feedback, and the other end is connected with ground; One end of one end of described 3rd inductance, one end of described 4th inductance and described 5th inductance is interconnected, the other end of described 3rd inductance to be connected with described feedback, the other end of described 4th inductance is connected with ground, the other end of described 5th inductance is connected with one end of described 3rd electric capacity, and the other end of described 3rd electric capacity is as the output of described FM signal filter circuit.
Further, the utility model embodiment still provides a kind of antenna circuit, also comprises:
Low noise amplifier, the input of described low noise amplifier is connected with the output of described FM signal filter circuit, for amplifying the signal of described FM signal filter circuit output.
Further, the utility model embodiment still provides a kind of antenna circuit, also comprises:
4th electric capacity, the 5th electric capacity and the 6th inductance, one end of described 4th electric capacity is connected with the output of described low noise amplifier, the other end is connected with one end of described 5th electric capacity, the other end of described 5th electric capacity is connected with ground, described 6th inductance and described 5th Capacitance parallel connection, the link of described 4th electric capacity and described 5th electric capacity is as output.
Further, the antenna circuit that above-described embodiment provides is planar inverted F-shape antenna circuit.
Further, the utility model embodiment provides a kind of mobile terminal, comprising: arbitrary described antenna circuit that above-described embodiment provides.
The utility model, by using filter circuit, utilizes the antenna that mobile terminal is built-in, solves the problem that mobile terminal listening in frequency modulation broadcast needs external wired earphone, the effect of listening in frequency modulation broadcast when realizing not adding any annex.
Accompanying drawing explanation
Fig. 1 is the structural representation of a kind of antenna circuit in the utility model embodiment one;
Fig. 2 is the circuit diagram of the radiofrequency signal filter circuit of a kind of antenna circuit in the utility model embodiment two;
Fig. 3 is the circuit diagram of the FM signal filter circuit of a kind of antenna circuit in the utility model embodiment two;
Fig. 4 is the circuit diagram of the FM signal filter circuit of a kind of antenna circuit in the utility model embodiment three;
Fig. 5 is the circuit diagram of the FM signal filter circuit of a kind of antenna circuit in the utility model embodiment four.
Embodiment
Below in conjunction with drawings and Examples, the utility model is described in further detail.Be understandable that, specific embodiment described herein only for explaining the utility model, but not to restriction of the present utility model.It also should be noted that, for convenience of description, illustrate only the part relevant to the utility model in accompanying drawing but not entire infrastructure.
Embodiment one
A kind of antenna circuit structure schematic diagram that Fig. 1 provides for the utility model embodiment one, this antenna circuit comprises: antenna 10, radiofrequency signal filter circuit 11 and FM signal filter circuit 12.
Wherein, antenna 10, comprising: radiofrequency signal feedback point and ground feedback point, preferably, antenna is planar inverted F-shape antenna.
Radiofrequency signal filter circuit 11, is connected with the radiofrequency signal feedback point of antenna.Radiofrequency signal filter circuit is for retaining global system for mobile communications (GlobalSystemforMobileCommunication, GSM) signal, the radio frequency signal frequency section that namely mobile communication is conventional, make the signal attenuation of other frequencies, GSM signal frequency is mainly at 880-960MHz.
FM signal filter circuit 12, is connected with the ground feedback point of antenna.For retaining FM broadcast singal, make the signal attenuation of other frequencies.
An antenna so just can be used to receive GSM signal and FM signal, make again two kinds of signals mutually disturb.Need not other antennas external again when using mobile terminal to receive FM signal, realize additional any annex when, listening in frequency modulation broadcast.
Embodiment two
The present embodiment is on the basis of above-described embodiment, about the preferred version of radiofrequency signal filter circuit and FM signal filter circuit.Fig. 2 is a kind of circuit diagram of radiofrequency signal filter circuit of antenna circuit, and Fig. 3 is a kind of circuit diagram of FM signal filter circuit of antenna circuit.
As shown in Figure 2, radiofrequency signal filter circuit, comprising: one end of the first electric capacity C1 parallel with one another and the first inductance L 1, first electric capacity C1 and radiofrequency signal feedback point are connected, the other end as the output of radiofrequency signal filter circuit.
First electric capacity C1 and the first inductance L 1 constitute band stop filter, and its centre frequency is
because radiofrequency signal filter circuit is for retaining radiofrequency signal, thus the first electric capacity C1 and the first inductance L 1 choose the centre position that centre frequency will be made in FM signal frequency section, FM signal of can as far as possible decaying like this.Example, selecting the capacitance of the first electric capacity C1 to be the inductance value of 39pF and the first inductance L 1 is 68nH, or the capacitance of selection the first electric capacity C1 is the inductance value of 22pF and the first inductance L 1 is 120nH, but the restriction not the first electric capacity C1 and the first inductance L 1 chosen here.
As shown in Figure 3, FM signal filter circuit, comprise: the second inductance L 2, the 3rd inductance L 3, the 4th inductance L 4, the 5th inductance L 5, second electric capacity C2 and the 3rd electric capacity C3, second electric capacity C2 and the second inductance L 2 parallel with one another, one end of second electric capacity C2 is connected with ground feedback point, and the other end is connected with ground; One end of one end of 3rd inductance L 3, one end of the 4th inductance L 4 and the 5th inductance L 5 is interconnected, the other end of the 3rd inductance L 3 is connected with ground feedback point, the other end of the 4th inductance L 4 is connected with ground, the other end of the 5th inductance L 5 is connected with one end of the 3rd electric capacity C3, and the other end of the 3rd electric capacity C3 is as the output of FM signal filter circuit.
Second electric capacity C2 and the second inductance L 2 form band pass filter, principle constitute band stop filter with the first electric capacity C1 and the first inductance L 1 identical.Just cannot pass through close to the signal of its centre frequency in frequency, but remain and output in subsequent conditioning circuit, the signal of other frequencies forms band pass filter through the second electric capacity C2 and the second inductance L 2 and outputs to ground.So the second electric capacity C2 and the second inductance L 2 choose the centre position that centre frequency will be made in FM signal frequency section, FM signal can be made like this to output to subsequent conditioning circuit, and the signal of other frequencies outputs to ground.Example, selecting the capacitance of the second electric capacity C2 to be the inductance value of 39pF and the second inductance L 2 is 68nH, or the capacitance of selection the second electric capacity C2 is the inductance value of 22pF and the second inductance L 2 is 120nH, but the restriction not the second electric capacity C2 and the second inductance L 2 chosen here.
The filter of the 3rd inductance L 3, the 4th inductance L 4, the 5th inductance L 5 and the 3rd electric capacity C3 composition is the variant of Butterworth (Butterworth) mode filter, its effect is the low-frequency signal of further filtering, example, select that the inductance value of the 3rd inductance L 3 is 68nH, the inductance value of the 4th inductance L 4 is 100nH, the inductance value of the 5th inductance L 5 is 33nH and the 3rd electric capacity C3 capacitance is 47nF, but the restriction not the 3rd inductance L 3, the 4th inductance L 4, the 5th inductance L 5 and the 3rd electric capacity C3 chosen here.
The technical scheme of the present embodiment, by the filter circuit of a series of electric capacity, inductance element composition, the signal of the unwanted frequency range of decay corresponding circuits, keep the least possible decay of the signal of the frequency range of needs simultaneously, solve mobile terminal to listen to FM broadcast and need the problem of peripheral earphone, when not reaching additional any annex, listen to the effect that FM broadcasts.
Embodiment three
The circuit diagram of the FM signal filter circuit of a kind of antenna circuit that Fig. 4 provides for the utility model embodiment three, this FM signal filter circuit is on the basis of embodiment two, preferably, add the low noise amplifier for amplifying signal, because the FM signal strength signal intensity received may be more weak, so carry out signal amplification.
As shown in Figure 4, the input of low noise amplifier is connected with the output of FM signal filter circuit, ground pin connects ground, power pins connects voltage source, and use decoupling capacitor to be connected in parallel in power pins, for the interference of filtering high-frequency signal, example, the capacitance of decoupling capacitor selects 0.1uF.
The technical scheme of the present embodiment, on the basis of technique scheme, adding the low noise amplifier for amplifying FM signal filter circuit output signal, facilitating subsequent conditioning circuit to convert electrical signals to sound.
Embodiment four
Fig. 5 is the circuit diagram of the FM signal filter circuit of a kind of antenna circuit that the utility model embodiment four provides, this FM signal filter circuit is on the basis of embodiment three, preferably, add the 4th electric capacity, the 5th electric capacity and the 6th inductance, further filtering process is carried out to the FM signal after amplification.
Wherein, one end of 4th electric capacity C4 is connected with the output of low noise amplifier, and the other end is connected with one end of the 5th electric capacity C5, and the other end of the 5th electric capacity C5 is connected with ground, 6th inductance L 6 and the 5th electric capacity C5 parallel connection, the link of the 4th electric capacity C4 and the 5th electric capacity C5 is as output.
5th electric capacity C5 and the 6th inductance L 6 form band pass filter, identical with the band pass filter that the second inductance L 2 forms with the second electric capacity C2 in embodiment two in principle, effect is also retain FM signal, the signal of other frequencies is made to output to ground, example, selecting the capacitance of the 5th electric capacity C5 to be the inductance value of 22pF and the 6th inductance L 6 is 120nH, but the restriction not the 5th electric capacity C5 and the 6th inductance L 6 chosen here.The effect of the 4th electric capacity C4 is isolated DC signal, example, and the capacitance selecting the 4th electric capacity C4 is 47nF.
The technical scheme of the present embodiment, on the basis of technique scheme, to the further filtering of FM signal after amplification, to reduce interference signal, ensures that user listens to the effect of FM broadcast.
Note, above are only preferred embodiment of the present utility model and institute's application technology principle.Skilled person in the art will appreciate that the utility model is not limited to specific embodiment described here, various obvious change can be carried out for a person skilled in the art, readjust and substitute and protection range of the present utility model can not be departed from.Therefore, although be described in further detail the utility model by above embodiment, but the utility model is not limited only to above embodiment, when not departing from the utility model design, can also comprise other Equivalent embodiments more, and scope of the present utility model is determined by appended right.
Claims (5)
1. an antenna circuit, is characterized in that, comprising:
Antenna, described antenna comprises radiofrequency signal feedback point and ground feedback point;
Radiofrequency signal filter circuit, comprises the first electric capacity parallel with one another and the first inductance, and one end of described first electric capacity is connected with described radiofrequency signal feedback point, and the other end is as the output of described radiofrequency signal filter circuit;
FM signal filter circuit, comprise the second inductance, the 3rd inductance, the 4th inductance, the 5th inductance, the second electric capacity and the 3rd electric capacity, described second electric capacity and described second inductance parallel with one another, one end of described second electric capacity to be connected with described feedback, and the other end is connected with ground; One end of one end of described 3rd inductance, one end of described 4th inductance and described 5th inductance is interconnected, the other end of described 3rd inductance to be connected with described feedback, the other end of described 4th inductance is connected with ground, the other end of described 5th inductance is connected with one end of described 3rd electric capacity, and the other end of described 3rd electric capacity is as the output of described FM signal filter circuit.
2. antenna circuit according to claim 1, is characterized in that, also comprises:
Low noise amplifier, the input of described low noise amplifier is connected with the output of described FM signal filter circuit, for amplifying the signal of described FM signal filter circuit output.
3. antenna circuit according to claim 2, is characterized in that, also comprises:
4th electric capacity, the 5th electric capacity and the 6th inductance, one end of described 4th electric capacity is connected with the output of described low noise amplifier, the other end is connected with one end of described 5th electric capacity, the other end of described 5th electric capacity is connected with ground, described 6th inductance and described 5th Capacitance parallel connection, the link of described 4th electric capacity and described 5th electric capacity is as output.
4. the antenna circuit according to any one of claim 1-3, is characterized in that: described antenna circuit is planar inverted F-shape antenna circuit.
5. a mobile terminal, is characterized in that, comprising: the antenna circuit described in any one of claim 1-4.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201520646275.2U CN204967801U (en) | 2015-08-25 | 2015-08-25 | Antenna circuitry and mobile terminal |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201520646275.2U CN204967801U (en) | 2015-08-25 | 2015-08-25 | Antenna circuitry and mobile terminal |
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| Publication Number | Publication Date |
|---|---|
| CN204967801U true CN204967801U (en) | 2016-01-13 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201520646275.2U Active CN204967801U (en) | 2015-08-25 | 2015-08-25 | Antenna circuitry and mobile terminal |
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| CN (1) | CN204967801U (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110519425A (en) * | 2019-08-20 | 2019-11-29 | 华勤通讯技术有限公司 | A kind of antenna assembly of terminal device |
| CN111741149A (en) * | 2020-06-19 | 2020-10-02 | 上海艾为电子技术股份有限公司 | Electronic equipment |
-
2015
- 2015-08-25 CN CN201520646275.2U patent/CN204967801U/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110519425A (en) * | 2019-08-20 | 2019-11-29 | 华勤通讯技术有限公司 | A kind of antenna assembly of terminal device |
| CN111741149A (en) * | 2020-06-19 | 2020-10-02 | 上海艾为电子技术股份有限公司 | Electronic equipment |
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