CN202713287U - Radio frequency circuit and mobile communication terminal - Google Patents
Radio frequency circuit and mobile communication terminal Download PDFInfo
- Publication number
- CN202713287U CN202713287U CN2012202260584U CN201220226058U CN202713287U CN 202713287 U CN202713287 U CN 202713287U CN 2012202260584 U CN2012202260584 U CN 2012202260584U CN 201220226058 U CN201220226058 U CN 201220226058U CN 202713287 U CN202713287 U CN 202713287U
- Authority
- CN
- China
- Prior art keywords
- antenna
- communication terminal
- mobile communication
- transmitting antenna
- receiving element
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Fee Related
Links
Images
Landscapes
- Transceivers (AREA)
- Mobile Radio Communication Systems (AREA)
Abstract
The utility model discloses a radio frequency circuit and a mobile communication terminal. A transmitting unit, a receiving unit and an antenna are comprised. The antenna comprises a receiving antenna and a transmitting antenna, wherein the receiving antenna and the transmitting antenna are separated from each other. The receiving antenna and the transmitting antenna have different work frequency bands and are respectively one-to-one corresponding to the receiving unit and the transmitting unit. According to the radio frequency circuit provided by the utility model, the receiving antenna and the transmitting antenna are separated from each other, thus the work frequency band of each antenna can be greatly reduced, and the resonant point of each antenna can be easily modulated to the work frequency band in which the antenna is located; at the same time the performance of the whole antenna is improved, the laying space of the antenna can be reduced; the layout of a PCB board of the mobile terminal is convenient; the demand for wireless communication of the current multifunctional mobile communication terminal is well satisfied.
Description
Technical field
The utility model belongs to the mobile communication technology field, specifically, and the mobile communication terminal that relates to a kind of structural design of radio circuit and adopt described radio circuit design.
Background technology
We are just living in the world of a wireless network at present, can obtain at any time the various information that we need from network, and mobile phone have become one of main tool of our access of radio network.Intelligent gradually at mobile phone, in the time of functional diversities, contradiction has occured with present hardware designs form in the wireless performance of mobile phone.How to improve wireless performance at multi-functional portable terminal like this, become the new problem that needs solve.
Describe as an example of present CDMA mobile phone example.In the CDMA mobile phone, the design of its antenna is to use an integrated antenna that a kind of radio band of standard is all covered, the radiofrequency signal of for example utilizing a transmitting-receiving integrated antenna to finish under the CDMA standard BC0 working frequency range 824MHz-894MHz receives and launch mission, this design need to be in mobile phone headroom go out enough antenna spaces and just can design well behaved antenna.For present mobile phone, its apparent size does not significantly increase, but the wireless network that uses is more and more diversified, integrated function is more and more, this just need to lay more functional circuit in limited mobile phone space, causing thus the laying space of antenna to dwindle gradually, is the CDMA antenna of 70MHz if need a bandwidth of operation of design, has been difficult to find one at present interior of mobile phone and can have satisfied the antenna space of Wide band high performance designing requirement.
The utility model content
The purpose of this utility model is to provide a kind of radio circuit that separates based on dual-mode antenna, by reception antenna is separated with transmitting antenna, and carry out independent design for receiving frequency range and transmit frequency band respectively, thereby under the prerequisite that guarantees antenna performance, reduce the laying space of antenna.
For solving the problems of the technologies described above, the utility model is achieved by the following technical solutions:
A kind of radio circuit comprises transmitter unit, receiving element and antenna; Described antenna comprises reception antenna and the transmitting antenna that is separated from each other, and the working frequency range of described reception antenna and transmitting antenna is different, and connects one to one with described receiving element and transmitter unit respectively.
Further, described reception antenna is connected described receiving element by band pass filter successively with match circuit.
Further again, described transmitting antenna is connected described transmitter unit by power amplifier, band pass filter and match circuit successively.
Preferably, described transmitter unit and receiving element preferably are integrated in the rf chip.
Based on above-mentioned radio frequency structure, the utility model also provides a kind of mobile communication terminal that adopts described radio circuit design, comprises antenna, master chip and the transmitter unit and the receiving element that are connected with described master chip; Described antenna comprises reception antenna and the transmitting antenna that is separated from each other, and the working frequency range of described reception antenna and transmitting antenna is different, and connects one to one with described receiving element and transmitter unit respectively.
Further, described reception antenna is connected described receiving element by band pass filter successively with match circuit; The upper and lower limit cut-off frequency of described band pass filter according to mobile communication terminal based on the frequency acceptance band of wireless network standard determine.
Further again, described transmitting antenna is connected described transmitter unit by power amplifier, band pass filter and match circuit successively; The upper and lower limit cut-off frequency of described band pass filter according to mobile communication terminal based on the emission band of wireless network standard determine.
Further, described reception antenna and transmitting antenna are laid in the diverse location on the inner pcb board of mobile communication terminal, with the coupled interference of minimizing transmission channel to receive path, and then the antijamming capability of enhancing receive path.
Preferably, described reception antenna and transmitting antenna are laid in the left and right sides of pcb board the same face top or the left and right sides of below, perhaps separately are laid in respectively top or the below of pcb board the same face.
Further, the wireless network standard that described mobile communication terminal adopts is based on the frequency division multiplexing mode, the selected reception frequency range of the working frequency range of described reception antenna and this wireless network standard is consistent, and the selected transmit frequency band of the working frequency range of described transmitting antenna and this wireless network standard is consistent.
Compared with prior art, advantage of the present utility model and good effect are: radio circuit of the present utility model passes through reception antenna and transmitting antenna separate design, thereby so that the working frequency range of each antenna can significantly dwindle, and can be easily the resonance point of each antenna be modulated in its present working band, thus when improving whole antenna performance, can dwindle the laying space of antenna, make things convenient for the pcb board layout of portable terminal, satisfy the wireless communication needs of present Multifunction communication terminal.
Description of drawings
Fig. 1 is the existing theory diagram that adopts a kind of radio circuit of integrated antenna design;
Fig. 2 is the schematic block circuit diagram of a kind of embodiment of the radio circuit that proposes of the utility model;
Fig. 3 is the integrated antenna return loss data waveform figure that adopts radio circuit design shown in Figure 1 to record;
Fig. 4 is the separate antenna return loss data waveform figure that adopts radio circuit design shown in Figure 2 to record;
Fig. 5 is the installation position schematic diagram of separate antenna on pcb board.
Embodiment
Below in conjunction with accompanying drawing embodiment of the present utility model is described in detail.
In the radio circuit design of conventional mobile communication terminal, all be to adopt an integrated antenna to receive and send radiofrequency signal, namely transmit and receive frequency band and use an antenna ANT to go to realize, as shown in Figure 1.Describe as an example of CDMA standard BC0 working frequency range 824MHz-894MHz example.When needs transmit, by transmitter unit output frequency transmitting in the 824MHz-849MHz frequency range, transfer to antenna ANT via duplexer, then externally launch by antenna ANT.When needs receive the radio frequency receiving signal that sends by mobile communications network, then at first by the radiofrequency signal of antenna ANT receive frequency in the 869MHz-894MHz frequency range, then transfer to duplexer, and then be sent to receiving element by duplexer and process.The effect of described duplexer is that the difference according to operating frequency will transmit and to receive signal isolated, guarantees to receive and emission can both work simultaneously.
Adopt the radio circuit of this integrated antenna ANT design, receive and emission two parts frequency range in order to cover on the one hand, take into account the each several part performance, usually the resonance point of antenna ANT need to be modulated to the centre position of whole passband, so optimum part is actual is in beyond the operating frequency for antenna, and then has affected the overall performance of antenna ANT.On the other hand, in the actual application environment of antenna, when placement had the object of metal material near antenna, it had not only dwindled the actual space that takies of antenna, causes the decline of bandwidth; And the metal device that reaches certain size also can with antenna generation mutual coupling, absorb the radiant power of antenna, increase the loss resistance of antenna, cause the reduction of antenna radiation efficiency.Therefore, around antenna, lay the rapid deterioration that metal device can directly cause antenna performance.
In order to satisfy the requirement of antenna bandwidth of operation, need to carry out Reasonable Arrangement to the metal device on the pcb board, thereby go out the headroom district that can satisfy its bandwidth requirement for the antenna headroom, as the laying space of antenna, to guarantee the performance of antenna.In general, the bandwidth of operation of antenna is wider, its headroom district that needs is just larger, this is for the mobile communication terminal of present pursuit functional diversities, because need to be more and more at the function element that pcb board is laid, therefore the pcb board space that need to take is increasing, has been difficult in limited product space headroom and has gone out the laying space that can satisfy all channel antenna performance requirement, and this also is a main cause that affects at present the smart mobile phone communication quality.
For this contradiction on the smart mobile phone spatial design, the present embodiment separates dual-mode antenna, carry out independent design for receiving frequency range and transmit frequency band respectively, so that the working frequency range of reception antenna only with smart mobile phone based on the frequency acceptance band of wireless network standard consistent, the frequency acceptance band 869MHz-894MHz of CDMA standard BC0 for example; So that the working frequency range of transmitting antenna only with smart mobile phone based on the emission band of wireless network standard consistent, the emission band 824MHz-849MHz of CDMA standard BC0 for example; Just can so that the working band of reception antenna and transmitting antenna dwindles, only be 25MHz thus.The concrete scope of the transmit frequency band of the present embodiment and reception frequency range only is based on the mobile phone terminal product.
Because along with the minimizing of the beamwidth of antenna, the required laying space of antenna also can reduce accordingly, therefore just can only carry out the design in headroom district for the antenna of 25MHz bandwidth when carrying out the pcb board design.The headroom district area required owing to the bandwidth of 25MHz is less, and therefore being easy to find out two suitable spaces at pcb board carries out the laying of two separate antenna, thereby realizes designing in less space high performance antenna.
For the antenna of two separation, the present embodiment proposes radio circuit design as shown in Figure 2, comprises radiofrequency signal receive path and transmission channel.In receive path, reception antenna ANT1 connecting band bandpass filter LR, and then be connected to receiving element RX via match circuit MR.In transmission channel, transmitting antenna ANT2 connects power amplifier PA, is connected to transmitter unit TX then by band pass filter LT matching connection circuit MT, and then via match circuit MT.Wherein, the line length that reception antenna ANT1 can be by adjusting antenna and resonance point make its working frequency range and smart mobile phone based on the frequency acceptance band of wireless network standard consistent; The upper cut-off frequency of band pass filter LR and lower-cut-off frequency can be determined according to the frequency acceptance band of this wireless network standard; Match circuit MR then can select the electric capacity of proper parameter value or inductance to make up formation according to the reception terminal of receiving element RX and the impedance operator of band pass filter LR.In like manner, for transmitting antenna ANT2, length that also can be by adjusting antenna and resonance point make its working frequency range and smart mobile phone based on the emission band of wireless network standard consistent; The upper cut-off frequency of band pass filter LT and lower-cut-off frequency then can be determined according to the emission band of this wireless network standard; The match circuit MT of emitting side then can select electric capacity or the inductance of proper parameter value to set up according to the emission terminal of transmitter unit TX and the impedance operator of band pass filter LT.Still the wireless network take CDMA standard BC0 working frequency range as 824MHz-894MHz describes as example, and the mobile communication terminal for adopting this wireless network standard then needs the working frequency range of its reception antenna ANT1 is adjusted to 869MHz-894MHz; Corresponding upper cut-off frequency of regulating the band pass filter LR of receiver side is 894MHz, and lower-cut-off frequency is 869MHz, to satisfy the reception requirement of radiofrequency signal.In like manner, the working frequency range of its transmitting antenna ANT2 is adjusted to 824MHz-849MHz; Corresponding upper cut-off frequency of regulating the band pass filter LT of emitting side is 849MHz, and lower-cut-off frequency is 824MHz, to satisfy the launch requirements of radiofrequency signal.
Described receiving element RX is connected with the master chip of mobile communication terminal inside with transmitter unit TX, utilizes master chip to achieve a butt joint to collect mail number and the encoding and decoding that transmit are processed and to the coordination control of peripheral functional circuit.
In the present embodiment, described receiving element RX and transmitter unit TX can independent design, also can be integrated in the rf chip, connect described master chip by this rf chip, to finish the interactive task of receiving and transmitting signal.
The operation principle of radio circuit shown in Figure 2 is: when needs transmit, master chip is exported signal to be sent to transmitter unit TX, and then be modulated into frequency transmitting in the 824MHz-849MHz frequency range by transmitter unit TX, after carrying out impedance matching via match circuit MT, transfer to band pass filter LT and carry out the filtering processing, then after exporting amplification that power amplifier PA transmits to and processing, ANT2 launches by transmitting antenna.When needs receive the radio frequency receiving signal that sends by mobile communications network, then by the radiofrequency signal of reception antenna ANT1 receive frequency in the 869MHz-894MHz frequency range, then carrying out filtering by band pass filter LR processes, filter out frequency acceptance band interference signal in addition, and then after being sent to receiving element RX and carrying out demodulation via match circuit MR, export master chip to and process to finish the decoding that receives signal, and the peripheral corresponding functional circuit action of control, corresponding operation finished.
Because the CDMA standard utilizes frequency will receive and transmit separately, what namely adopt is the frequency division multiplexing working method, therefore, the present embodiment utilizes this characteristic transmitting antenna and reception antenna separately can be designed when circuit design, thus one, when regulating the resonance point of antenna, can only adjust the working frequency range of reception antenna for the frequency acceptance band of CDMA standard, adjust the working frequency range of transmitting antenna for the emission band of CDMA standard, thus just can be so that the resonance point of each antenna be in the frequency band of its work, this compares the design that the traditional integral antenna need to be adjusted to resonance point whole passband centre position, and the performance of antenna is able to remarkable lifting.
Reception antenna ANT1 and transmitting antenna ANT2 separately are laid in the diverse location of Mobile phone PCB, preferably all be laid in the back side (i.e. the one side relative with the mobile phone back housing) of pcb board, for example the left and right sides (such as the solid line antenna among Fig. 5) of top, the pcb board back side or the left and right sides (such as the dotted line antenna among Fig. 5) of below; Also an antenna can be laid in the top, another antenna is laid in the below, by with two antennas as far as possible away from, to reduce emission to receiving the coupled interference of path, increase the antijamming capability that receives path.Certainly, for the concrete installation position of two antennas on pcb board, the present embodiment is not limited in above giving an example.
When carrying out the PCB layout, for reserving respectively corresponding antenna, reception antenna ANT1 and transmitting antenna ANT2 lay the space, design bandwidth is reception antenna ANT1 and the transmitting antenna ANT2 of 25MHz respectively in corresponding laying space, the antenna performance of designing like this has great raising than integrated antenna performance, and this point can be by carrying out return loss test proved.
Adopt the radio circuit of traditional integral Antenna Design, its return loss test data as shown in Figure 3; The radio circuit that the separate antenna that adopts the present embodiment to propose designs, its return loss test data as shown in Figure 4.Can clearly be seen that from Fig. 3 and two waveforms shown in Figure 4: because the bandwidth ratio of integrated antenna is larger, the real work band performance has been in wave edges, the antenna resonance point is in the transmitting-receiving isolation frequency range, thereby causes the variation of whole antenna working frequency range performance.For example: the best return loss data of tranmitting frequency among Fig. 3 (824MHZ-849MHZ) part are-11dB, and the return loss of low frequency part becomes-3dB.In this case, the emitting performance of low frequency part is very poor.And when adopting separate antenna, because the bandwidth of each antenna is narrow, therefore the performance of antenna is all relatively good in whole bandwidth of operation.And the resonance point of antenna all is in its working band, and this is also so that antenna performance just is in optimum state in its working band.
Table 1 has been listed return loss index RL
DBAnd the corresponding relation between the actual transmission efficient PT%:
| RLdB | -10 | -6.99 | -6.02 | -5.23 | -3.98 | -3.01 | -2.22 | -1.55 | -1.25 | -0.97 | -0.46 | 0 |
| PT％ | 90.0 | 80.0 | 75.0 | 70.0 | 60.0 | 50.0 | 40.0 | 30.0 | 25 | 20.0 | 10.0 | 0 |
Table 1
Can clearly be seen that from table 1: for the radio circuit that adopts the integrated antenna design, because the return loss of its low frequency part becomes-3dB, so the actual transmission efficient of antenna only has 50%, and loss is serious.And the radio circuit that adopts separate antenna to design, even the poorest return loss that appears at low frequency part only-8.83dB (as shown in Figure 4), the table of comparisons 1 can its actual emission effciency also reach more than 85%, thus sufficient proof the performance of separate antenna be much better than the performance of integrated antenna, be more suitable for being applied in the mobile phone environment that becomes increasingly complex at present, to improve the performance for wireless communications of mobile phone.
Certainly, only specify as an example of CDMA standard BC0 working frequency range example more than the present embodiment, adopt the wireless network standard (such as WCDMA etc.) of frequency division multiplexing modes same applicable for other.Moreover, applicable too for the wireless network standard (such as GSM, TD-CDMA etc.) based on time division multiplexing and frequency division multiplexing dual mode.
It is pointed out that the radio circuit design based on the transmitting-receiving separate antenna that the present embodiment proposes is not only applicable to mobile phone products, support that for other portable terminal (such as panel computer etc.) of wireless communications is same applicable.
Certainly; the above only is a kind of preferred implementation of the present utility model, for those skilled in the art, and under the prerequisite that does not break away from the utility model principle; can also make some improvements and modifications, these improvements and modifications also should be considered as protection range of the present utility model.
Claims (10)
1. a radio circuit comprises transmitter unit, receiving element and antenna; It is characterized in that: described antenna comprises reception antenna and the transmitting antenna that is separated from each other, and the working frequency range of described reception antenna and transmitting antenna is different, and connects one to one with described receiving element and transmitter unit respectively.
2. radio circuit according to claim 1, it is characterized in that: described reception antenna is connected described receiving element by band pass filter successively with match circuit.
3. radio circuit according to claim 1, it is characterized in that: described transmitting antenna is connected described transmitter unit by power amplifier, band pass filter and match circuit successively.
4. each described radio circuit in 3 according to claim 1, it is characterized in that: described transmitter unit and receiving element are integrated in the rf chip.
5. a mobile communication terminal comprises antenna, master chip and the transmitter unit and the receiving element that are connected with described master chip; It is characterized in that: described antenna comprises reception antenna and the transmitting antenna that is separated from each other, and the working frequency range of described reception antenna and transmitting antenna is different, and connects one to one with described receiving element and transmitter unit respectively.
6. mobile communication terminal according to claim 5, it is characterized in that: described reception antenna is connected described receiving element by band pass filter successively with match circuit; The upper and lower limit cut-off frequency of described band pass filter according to mobile communication terminal based on the frequency acceptance band of wireless network standard determine.
7. mobile communication terminal according to claim 5, it is characterized in that: described transmitting antenna is connected described transmitter unit by power amplifier, band pass filter and match circuit successively; The upper and lower limit cut-off frequency of described band pass filter according to mobile communication terminal based on the emission band of wireless network standard determine.
8. each described mobile communication terminal in 7 according to claim 5, it is characterized in that: described reception antenna and transmitting antenna are laid in the diverse location on the inner pcb board of mobile communication terminal.
9. mobile communication terminal according to claim 8, it is characterized in that: described reception antenna and transmitting antenna are laid in the left and right sides of pcb board the same face top or the left and right sides of below, perhaps separately are laid in respectively top or the below of pcb board the same face.
10. each described mobile communication terminal in 7 according to claim 5, it is characterized in that: the wireless network standard that described mobile communication terminal adopts is based on the frequency division multiplexing mode, the selected reception frequency range of the working frequency range of described reception antenna and this wireless network standard is consistent, and the selected transmit frequency band of the working frequency range of described transmitting antenna and this wireless network standard is consistent.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2012202260584U CN202713287U (en) | 2012-05-18 | 2012-05-18 | Radio frequency circuit and mobile communication terminal |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2012202260584U CN202713287U (en) | 2012-05-18 | 2012-05-18 | Radio frequency circuit and mobile communication terminal |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN202713287U true CN202713287U (en) | 2013-01-30 |
Family
ID=47593544
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2012202260584U Expired - Fee Related CN202713287U (en) | 2012-05-18 | 2012-05-18 | Radio frequency circuit and mobile communication terminal |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN202713287U (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103795431A (en) * | 2014-01-28 | 2014-05-14 | 络达科技股份有限公司 | Wireless transceiving device with frequency band matching adjusting function and adjusting method of wireless transceiving device |
| CN113300735A (en) * | 2021-05-10 | 2021-08-24 | Tcl通讯（宁波）有限公司 | Radio frequency antenna device, radio frequency antenna device signal receiving method and mobile terminal |
-
2012
- 2012-05-18 CN CN2012202260584U patent/CN202713287U/en not_active Expired - Fee Related
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103795431A (en) * | 2014-01-28 | 2014-05-14 | 络达科技股份有限公司 | Wireless transceiving device with frequency band matching adjusting function and adjusting method of wireless transceiving device |
| CN113300735A (en) * | 2021-05-10 | 2021-08-24 | Tcl通讯（宁波）有限公司 | Radio frequency antenna device, radio frequency antenna device signal receiving method and mobile terminal |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN108199728B (en) | Multi-way selector switch, radio frequency system and wireless communication equipment | |
| CN108923790B (en) | Multi-way selector switch, radio frequency system and wireless communication equipment | |
| CN108880602B (en) | Multi-way selector switch and related products | |
| JP7038212B2 (en) | Multi-way switch, radio frequency system and wireless communication device | |
| EP3540961B1 (en) | Multiway switch, radio frequency system, and wireless communication device | |
| CN101562460B (en) | Wireless receiving and emitting device of mobile communication terminal | |
| CN102420625B (en) | Matching circuit, matching circuit network and signal transmit-receive device | |
| CN108390694B (en) | Multi-way selector switch, radio frequency system and wireless communication equipment | |
| CN112134588B (en) | Multi-way selector switch and related products | |
| CN101442330B (en) | Radio frequency circuit and CDMA mobile terminal | |
| CN105471557A (en) | Carrier aggregation device | |
| CN105376872A (en) | Method and terminal supporting carrier aggregation | |
| CN201278522Y (en) | Radio frequency front-end circuit for mobile terminal system | |
| CN204333256U (en) | There is the LTE carrier aggregation antenna of full metal jacket portable set | |
| CN105553494A (en) | Radio frequency front-end frequency selection circuit and signal receiving method thereof | |
| CN107196687A (en) | Launch and/or receive the wireless communication terminal of the signal in predetermined frequency band simultaneously | |
| CN108923792B (en) | Multi-way selector switch and related products | |
| CN102075207A (en) | Device and method for implementing bluetooth and Wi-Fi single antenna | |
| KR101715403B1 (en) | Multimode wireless modem | |
| CN104577332B (en) | Improve spuious isolation closed-loop Tuning Control device and method between antenna | |
| CN102332929A (en) | Dual-mode radio frequency module, dual-mode radio frequency sending and receiving method and user terminal | |
| CN107889120B (en) | Indoor coverage system for improving TDD-LTE uplink interference immunity | |
| CN201639571U (en) | Mobile communication terminal with mobile television function | |
| CN202713287U (en) | Radio frequency circuit and mobile communication terminal | |
| WO2015176438A1 (en) | Radio frequency transmission/reception method and system |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20130130 Termination date: 20190518 |
|
| CF01 | Termination of patent right due to non-payment of annual fee |