CN110429941B - Antenna control circuit and mobile terminal - Google Patents
Antenna control circuit and mobile terminal Download PDFInfo
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- CN110429941B CN110429941B CN201910709147.0A CN201910709147A CN110429941B CN 110429941 B CN110429941 B CN 110429941B CN 201910709147 A CN201910709147 A CN 201910709147A CN 110429941 B CN110429941 B CN 110429941B
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01S—RADIO DIRECTION-FINDING; RADIO NAVIGATION; DETERMINING DISTANCE OR VELOCITY BY USE OF RADIO WAVES; LOCATING OR PRESENCE-DETECTING BY USE OF THE REFLECTION OR RERADIATION OF RADIO WAVES; ANALOGOUS ARRANGEMENTS USING OTHER WAVES
- G01S19/00—Satellite radio beacon positioning systems; Determining position, velocity or attitude using signals transmitted by such systems
- G01S19/01—Satellite radio beacon positioning systems transmitting time-stamped messages, e.g. GPS [Global Positioning System], GLONASS [Global Orbiting Navigation Satellite System] or GALILEO
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01S—RADIO DIRECTION-FINDING; RADIO NAVIGATION; DETERMINING DISTANCE OR VELOCITY BY USE OF RADIO WAVES; LOCATING OR PRESENCE-DETECTING BY USE OF THE REFLECTION OR RERADIATION OF RADIO WAVES; ANALOGOUS ARRANGEMENTS USING OTHER WAVES
- G01S19/00—Satellite radio beacon positioning systems; Determining position, velocity or attitude using signals transmitted by such systems
- G01S19/38—Determining a navigation solution using signals transmitted by a satellite radio beacon positioning system
- G01S19/39—Determining a navigation solution using signals transmitted by a satellite radio beacon positioning system the satellite radio beacon positioning system transmitting time-stamped messages, e.g. GPS [Global Positioning System], GLONASS [Global Orbiting Navigation Satellite System] or GALILEO
- G01S19/42—Determining position
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B1/00—Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised by the medium used for transmission
- H04B1/005—Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised by the medium used for transmission adapting radio receivers, transmitters andtransceivers for operation on two or more bands, i.e. frequency ranges
- H04B1/0053—Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised by the medium used for transmission adapting radio receivers, transmitters andtransceivers for operation on two or more bands, i.e. frequency ranges with common antenna for more than one band
- H04B1/0057—Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised by the medium used for transmission adapting radio receivers, transmitters andtransceivers for operation on two or more bands, i.e. frequency ranges with common antenna for more than one band using diplexing or multiplexing filters for selecting the desired band
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B1/00—Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised by the medium used for transmission
- H04B1/005—Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised by the medium used for transmission adapting radio receivers, transmitters andtransceivers for operation on two or more bands, i.e. frequency ranges
- H04B1/0053—Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised by the medium used for transmission adapting radio receivers, transmitters andtransceivers for operation on two or more bands, i.e. frequency ranges with common antenna for more than one band
- H04B1/006—Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised by the medium used for transmission adapting radio receivers, transmitters andtransceivers for operation on two or more bands, i.e. frequency ranges with common antenna for more than one band using switches for selecting the desired band
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B1/00—Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised by the medium used for transmission
- H04B1/005—Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised by the medium used for transmission adapting radio receivers, transmitters andtransceivers for operation on two or more bands, i.e. frequency ranges
- H04B1/0064—Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised by the medium used for transmission adapting radio receivers, transmitters andtransceivers for operation on two or more bands, i.e. frequency ranges with separate antennas for the more than one band
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B1/00—Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised by the medium used for transmission
- H04B1/38—Transceivers, i.e. devices in which transmitter and receiver form a structural unit and in which at least one part is used for functions of transmitting and receiving
- H04B1/40—Circuits
- H04B1/401—Circuits for selecting or indicating operating mode
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B7/00—Radio transmission systems, i.e. using radiation field
- H04B7/02—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas
- H04B7/04—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas
- H04B7/0404—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas the mobile station comprising multiple antennas, e.g. to provide uplink diversity
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W88/00—Devices specially adapted for wireless communication networks, e.g. terminals, base stations or access point devices
- H04W88/02—Terminal devices
- H04W88/06—Terminal devices adapted for operation in multiple networks or having at least two operational modes, e.g. multi-mode terminals
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- Engineering & Computer Science (AREA)
- Computer Networks & Wireless Communication (AREA)
- Signal Processing (AREA)
- Radar, Positioning & Navigation (AREA)
- Remote Sensing (AREA)
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Variable-Direction Aerials And Aerial Arrays (AREA)
- Mobile Radio Communication Systems (AREA)
- Position Fixing By Use Of Radio Waves (AREA)
Abstract
The invention provides an antenna control circuit and a mobile terminal, wherein the antenna control circuit comprises: the cellular high-frequency transceiving unit and the GPS receiver are respectively connected with the first combiner, and the first combiner is used for connecting a first antenna. According to the technical scheme of the invention, the GPS signal and the high-frequency signal antenna of the cellular network are adopted, so that the total number of the antennas can be reduced, the design difficulty of the antennas can be reduced, and the strength of the GPS signal can be improved.
Description
Technical Field
The invention relates to the technical field of communication, in particular to an antenna control circuit and a mobile terminal.
Background
For an existing intelligent mobile terminal, three wireless communication functions, namely WIFI (wireless fidelity) communication, cellular communication and GPS positioning, are generally provided, and each wireless communication function needs a corresponding antenna to implement transmission and/or reception of a signal. The operating frequency of cellular communication mainly includes the following frequency bands: a low frequency part (LB) having a frequency range of 617MHz to 960 MHz; an intermediate frequency part (MB) having a frequency range of 1710MHz to 2200 MHz; a high frequency part (HB) having a frequency of 2300MHz to 2690 MHz. The operating frequencies of the GPS positioning generally include a GPS L1 frequency band and a GPS L5 frequency band, which have operating frequencies of 1575.42 ± 1.023MHz and 1176.45 ± 1.023MHz, respectively.
For the antennas required for GPS positioning, for example, fig. 1(a) and 1(b) show two common designs of existing GPS antennas, respectively. In the first scheme, a GPS antenna is separately provided for the GPS, that is, different antennas are respectively used for the WIFI 2.4G and the WIFI 5G. In the second design scheme, the total number of the antennas is reduced by combining the GPS and the WIFI 2.4 to share one antenna.
However, as the number of the operating frequency bands of the antennas required for cellular communication is large, the antennas are generally freely combined according to low frequency, intermediate frequency and high frequency. For example, the low frequency, the intermediate frequency and the high frequency can be combined into one path, i.e. a pair of antennas is shared; or a pair of antennas is independently used at low frequency, and the medium frequency and the high frequency are combined into one path to share the antenna; or the low frequency and the high frequency are combined into one path, the antenna is shared, and the high frequency is independently used by a pair of antennas, and the like. In order to reduce mutual interference between various signals, proper isolation between antennas is required. As smart phones become smaller, isolation and design between antennas become more and more difficult as the number of antennas increases.
Disclosure of Invention
In view of the above problems, the present invention provides an antenna control circuit and a mobile terminal, which can reduce the total number of antennas in the mobile terminal, reduce the difficulty of antenna design, and improve the GPS signal reception strength by sharing the GPS and the cellular high frequency antennas.
One embodiment of the present invention provides an antenna control circuit including: the cellular high-frequency transceiving unit and the GPS receiver are respectively connected with the first combiner, and the first combiner is used for connecting a first antenna.
Further, the cellular high frequency transceiving unit comprises a cellular high frequency main set receiver and a cellular high frequency transmitter, and the antenna control circuit further comprises: a cellular high frequency diversity receiver for connection to a second antenna.
Further, the antenna control circuit further includes: a first changeover switch; the first change-over switch is a double-pole double-throw switch;
the first switch is used for connecting the first combiner to the first antenna and connecting the cellular high-frequency diversity receiver to the second antenna when the receiving performance of the first antenna is larger than that of the second antenna;
the first switch is further configured to switch the first combiner from the first antenna to the second antenna and switch the cellular high frequency diversity receiver from the second antenna to the first antenna when the reception performance of the second antenna is greater than the reception performance of the first antenna.
Further, the antenna control circuit further includes: the first switch is used for switching the first combiner from the first antenna to the second antenna and switching the cellular high-frequency diversity receiver from the second antenna to the first antenna when the receiving performance of the second antenna is greater than the receiving performance of the first antenna and the difference between the receiving performances of the first antenna and the second antenna is greater than a preset threshold value.
Further, the antenna control circuit further includes: the cellular intermediate frequency transceiver unit and the cellular low frequency transceiver unit are connected with the second combiner, the second combiner is connected with the first tuning switch, and the first tuning switch is used for connecting a third antenna.
Further, the cellular low frequency transceiver unit includes a cellular low frequency main set receiver and a cellular low frequency transmitter, the cellular intermediate frequency transceiver unit includes a cellular intermediate frequency main set receiver and a cellular intermediate frequency transmitter, and the antenna control circuit further includes: the system comprises a cellular low-frequency diversity receiver, a cellular intermediate-frequency diversity receiver, a third combiner and a second tuning switch;
the cellular low-frequency diversity receiver and the cellular intermediate-frequency diversity receiver are both connected with the third combiner, the third combiner is connected with the second tuning switch, and the second tuning switch is used for being connected with a fourth antenna.
Further, the antenna control circuit further includes: a second changeover switch; the second change-over switch is a double-pole double-throw switch;
the second switch is used for connecting the second combiner to the first tuning switch and connecting the third combiner to the second tuning switch when the receiving performance of the third antenna is greater than that of the fourth antenna;
the second switch is further configured to switch the second combiner from the first tuning switch to the second tuning switch and switch the third combiner from the second tuning switch to the first tuning switch when the reception performance of the fourth antenna is greater than the reception performance of the third antenna.
Further, the antenna control circuit further includes: and the cellular high-frequency transceiver unit and the GPS receiver are respectively connected with the radio frequency modem.
Further, the antenna control circuit includes: the WIFI receiving and transmitting unit is connected with the WIFI modem and is used for being connected with a WIFI antenna.
Still another embodiment of the present invention provides a mobile terminal including the antenna control circuit.
The antenna control circuit comprises a cellular high-frequency transceiving unit, a GPS receiver and a first combiner, wherein the cellular high-frequency transceiving unit and the GPS receiver are respectively connected with the first combiner, and the first combiner is used for being connected with a first antenna. According to the invention, the GPS and the cellular high frequency are subjected to antenna sharing design, so that the total number of antennas on the mobile terminal can be reduced, and the design difficulty of an antenna control circuit can be reduced. In addition, because the GPS demodulator is integrated in a modulation and demodulation chip of a cellular network, and the control circuit design shared by the antenna and the cellular high frequency can enable the GPS antenna to be closer to the GPS demodulator, the insertion loss of the GPS circuit can be reduced, the GPS signal receiving intensity can be improved, and the like.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings needed to be used in the embodiments will be briefly described below, it should be understood that the following drawings only illustrate some embodiments of the present invention and therefore should not be considered as limiting the scope, and for those skilled in the art, other related drawings can be obtained according to the drawings without inventive efforts.
FIGS. 1(a) and 1(b) are two scenarios of prior art GPS antenna arrangements;
fig. 2 is a schematic diagram showing a first structure of an antenna control circuit according to an embodiment of the present invention;
fig. 3 is a schematic diagram showing a second structure of the antenna control circuit according to the embodiment of the present invention;
fig. 4 is a schematic diagram showing a third structure of the antenna control circuit according to the embodiment of the present invention;
fig. 5 is a diagram showing a fourth configuration of the antenna control circuit according to the embodiment of the present invention;
fig. 6 shows a fifth structural diagram of the antenna control circuit according to the embodiment of the present invention.
Description of the main element symbols:
1. 2-an antenna control circuit; 100-radio frequency modem;
110-a cellular high frequency transceiver unit; 111-cellular high frequency transmitter;
112-cellular high frequency master receiver; 120-a GPS receiver; 130-a first combiner;
140-a first antenna; 150-a cellular high frequency diversity receiver; 160-a second antenna;
170-a first diverter switch; 200-a cellular low frequency transceiver unit; 210-a cellular intermediate frequency transceiving unit;
220-a second combiner; 230-a first tuning switch; 240-a third antenna;
250-a cellular low frequency diversity receiver; 260-cellular intermediate frequency diversity receiver;
270-a third combiner; 280-a second tuning switch; 290-a fourth antenna;
300-a second diverter switch; 310-a WIFI modem; 320-a WIFI transceiving unit;
330-a WIFI antenna; 321-WIFI 2.4G transceiving unit; 322-WIFI 5G transceiver unit;
331-WIFI 2.4G antenna; 332-WIFI 5G antenna.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments.
The components of embodiments of the present invention described and illustrated in the figures herein may be arranged and designed in a wide variety of different configurations. Thus, the following detailed description of the embodiments of the present invention, presented in the figures, is not intended to limit the scope of the invention, as claimed, but is merely representative of selected embodiments of the invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments of the present invention without making any creative effort, shall fall within the protection scope of the present invention.
The invention mainly aims at the design of the GPS antenna and provides a novel antenna control circuit design to improve some problems existing in the existing GPS antenna design scheme. For the first scheme shown in fig. 1(a), since the GPS and the WIFI respectively use separate antennas, the first scheme not only occupies the limited space of the mobile terminal, but also increases the cost and the design difficulty. With the second scheme as shown in fig. 1(b), although the antenna sharing of GPS and WIFI 2.4G is implemented, since the GPS demodulator and the WIFI modem are usually respectively disposed at different positions of the mobile terminal, this will make the GPS antenna far away from the GPS demodulation circuit, which results in a large insertion loss of the GPS signal, and finally results in a weak GPS signal. In addition, in both of the above two schemes, the efficiency of the GPS antenna is reduced due to the fact that the GPS antenna is held by hand, and the GPS signal is degraded.
Therefore, the application provides an antenna control circuit which shares the GPS and the cellular high frequency antenna. This is because the inventor, when conducting research on GPS antenna design, finds that the existing GPS solution is not usually shared with the cellular communication network, mainly because the cellular communication network has many frequency bands and relatively wide bandwidth, and the cellular communication network often needs to be implemented by using antenna tuning technology, such as cellular low frequency and cellular intermediate frequency parts. GPS, however, operates almost always without the application of antenna tuning techniques, which means that cellular communications requiring the use of antenna tuning techniques cannot operate simultaneously with GPS.
Thus, the inventors contemplate isolating the high frequency portion of cellular communications and antenna sharing of GPS with cellular high frequencies. Therefore, the working frequency of the cellular high frequency is high, the antenna can be designed without applying an antenna tuning technology, and meanwhile, the GPS does not need to use the tuning technology, so that the GPS and the cellular high frequency are shared, the total number of the antennas of the mobile terminal can be reduced, and the design difficulty of an antenna control circuit can be reduced. For both GPS positioning and cellular high-frequency communication, tuning techniques are not required, and therefore, a tuning circuit, a switching design thereof, and the like are not required. In addition, because the GPS demodulator is usually integrated in the modulation and demodulation chip of the cellular communication network, the GPS antenna can be closer to the GPS demodulator, the insertion loss of a GPS circuit is greatly reduced, and the GPS signal intensity is improved.
The present invention will be described below with reference to specific examples, but the present invention is not limited to these specific examples.
Example 1
Referring to fig. 2, the present embodiment provides an antenna control circuit 1, which can be applied to a mobile terminal supporting cellular communication and GPS positioning functions, such as a mobile phone and a tablet. By sharing the GPS and the cellular high frequency antenna, the antenna control circuit 1 can realize functions such as reception of a GPS signal and transmission and reception of a cellular high frequency signal by the shared antenna. The structure of the antenna control circuit 1 will be described in detail below.
As shown in fig. 2, the antenna control circuit 1 includes a cellular high frequency transceiver unit 110, a GPS receiver 120 and a first combiner 130, wherein the cellular high frequency transceiver unit 110 and the GPS receiver 120 are respectively connected to the first combiner 130, and the first combiner 130 is used for connecting a first antenna 140. As another optional solution, the antenna control circuit 1 further includes a first antenna 140, and the first antenna 140 is configured to be connected to the first combiner 130.
In this embodiment, the first antenna 140 serves as a common antenna for cellular high-frequency communication and GPS positioning, and is used for signal reception and signal transmission of cellular high-frequency signals and also for signal reception of GPS signals. It will be appreciated that since GPS signals typically include a GPS L1 frequency band and a GPS L5 frequency band, the GPS receiver in this embodiment may be a GPS L1 receiver or a GPS L5 receiver. Of course, if the operating frequency of the first antenna 140 includes cellular high frequency, GPS L1 and L5 bands, the GPS receiver is composed of a GPS L1 receiver and a GPS L5 receiver.
In order to provide the first antenna 140 with the capability of receiving two different frequency signals, i.e. cellular high frequency signal and GPS positioning signal, for example, the antenna length of the antenna with the original resonant frequency in the high frequency range (e.g. 2300MHz to 2690MHz) may be increased to increase a resonant point of the antenna in the frequency range of GPS L1 or GPS L5, so that the working frequency of the common antenna will include cellular high frequency and GPS L1 or L5 frequency band. Of course, the first antenna 140 may also be improved in size to increase the resonance points in the frequency ranges of both GPS L1 and GPS L5, i.e., to make the operating frequency of the common antenna include cellular high frequency, GPS L1 and L5 bands. It will be appreciated that since the length of the antenna is generally determined by the frequency of the transmitted and received signals, the first antenna 140 can be obtained by modifying an existing antenna according to actual requirements.
The first combiner 130 is used to combine the cellular high-frequency transceiving path and the GPS receiving path into one path. Exemplarily, the first combiner 130 may employ a filter based on LTCC (Low-Temperature Co-fired Ceramic) technology, and the like. It can be understood that the stacked design of the first combiner 130 using LTCC technology can effectively realize the miniaturization, high performance and high reliability design of multiple filters.
For example, if the cellular high frequency signal and the GPS L1 or L5 frequency band signal share the first antenna 140, the first combiner 130 may use a two-in-one type filter, i.e., a low pass filter and a high pass filter. Wherein, the working frequency of the low-pass filter comprises 1600MHz and lower frequency band, and is connected to the GPS receiver; the working frequency of the high-pass filter comprises a frequency band of 2300MHz and above, and is connected to the cellular high-frequency receiver.
Alternatively, if the cellular high frequency signal, the signals of the GPS L1 and L5 frequency bands share the first antenna 140, the first combiner 130 may employ a three-in-one type filter, i.e., a low pass filter, a band pass filter and a high pass filter. Wherein, the working frequency of the low-pass filter comprises a frequency band of 1200MHz and below and is connected to a GPS L5 receiver; the working frequency of the band-pass filter is in the range of the GPS L1 frequency band, and the band-pass filter is connected to a GPS L1 receiver; the working frequency of the high-pass filter comprises 2300MHz and below frequency band and is connected to the cellular high-frequency receiver.
In the present embodiment, the GPS receiver 120 is used to perform reception processing such as filtering on the GPS signal received by the first antenna 140. And the cellular high-frequency transceiving unit 110 includes a cellular high-frequency transmitter 111 and a cellular high-frequency main-set receiver 112. The cellular high-frequency transmitter 111 is configured to process a cellular high-frequency signal to be transmitted, and output the processed cellular high-frequency signal to the first antenna 140 through the first combiner 130 for transmission; the cellular high frequency master receiver 112 is used to amplify the cellular high frequency signal received by the first antenna 140, and then to send the signal to the rf modem for demodulation.
It will be appreciated that the first antenna 140 will act as the main set antenna, i.e. the transmission and reception of the load cell high frequency signal, when connected to the cell high frequency transceiver unit 110. In this case, if there is another antenna, such as a diversity antenna, it is used to assist reception of the cellular high-frequency signal, that is, to receive only the non-transmitted signal. The signals received by the two antennas are combined, so that diversity gain is obtained, and the signal-to-noise ratio of the received signals can be improved.
As a preferable scheme, as shown in fig. 3, the antenna control circuit 1 of the present embodiment further includes a cellular high frequency diversity receiver 150, and the cellular high frequency diversity receiver 150 is used for connecting the second antenna 160. It will be appreciated that when the first antenna 140 is connected to the cellular high frequency transceiver unit 110, the second antenna 160 will act as a diversity antenna for receiving cellular high frequency signals, i.e. is primarily responsible for diversity reception. As another alternative, the antenna control circuit 1 further comprises a second antenna 160, and the second antenna 160 is used for connecting the cellular high frequency diversity receiver 150.
In this embodiment, the cellular high frequency diversity receiver 150 is configured to perform diversity reception via the second antenna 160 when the cellular high frequency transceiver unit 110 receives a cellular high frequency signal. For the reception of the cellular high frequency signal, due to its high frequency and short wavelength, in order to avoid puff or click sound during the reception of the signal, the cellular high frequency diversity receiver 150 and the second antenna 160 are arranged to greatly reduce the "frequency running" phenomenon, thereby increasing the signal-to-noise ratio of the received signal.
In the actual mobile communication process, since the mobile terminal generally operates in a relatively complex geographical environment and the moving speed and direction are arbitrary, the arrangement of the diversity antenna can eliminate the "frequency offset" phenomenon caused by the mutual phase cancellation in the multipath transmission. For example, the diversity reception technique divides the received multipath signals into uncorrelated multipath signals, and then combines the multipath signals to maximize the received useful signal energy, and also can improve the reliability under multipath fading channel transmission.
Optionally, as shown in fig. 3, the antenna control circuit 1 further includes a radio frequency modem 100, and the cellular high frequency transceiver unit 110 and the GPS receiver 120 are respectively connected to the radio frequency modem 100. If the antenna control circuit 1 further comprises a cellular high frequency diversity receiver 150, the radio frequency modem 100 is further connected to the cellular high frequency diversity receiver 150.
In this embodiment, the rf modem 100 is used for modulation and demodulation of cellular signals and demodulation of GPS signals. Exemplarily, the rf modem 100 comprises a cellular modem and a GPS demodulator, wherein the cellular modem is used for signal modulation of a cellular high frequency signal to be transmitted and for demodulation of a received cellular high frequency signal. And the GPS demodulator is used for demodulating the received GPS signal.
As another preferable mode, as shown in fig. 4, the antenna control circuit 1 further includes a first changeover switch 170. The first switch 170 is located between the first combiner 130 and the first antenna 140, and between the cellular high frequency diversity receiver 150 and the second antenna 160. The first switch 170 is to switch the connection between the first combiner 130 and the cellular high frequency diversity receiver 150 between the first antenna 140 and the second antenna 160, respectively. For example, the first switch 170 may be a double-pole double-throw switch, as shown in fig. 4. Of course, the first switch 170 can also be two single-pole multi-throw switches or two double-pole single-throw switches, etc. It will be appreciated that the second antenna 160 at this point should be capable of receiving both cellular high frequency signals and GPS signals.
Exemplarily, when the receiving performance of the first antenna 140 is greater than or equal to the receiving performance of the second antenna 160, the first switch 170 is used to connect the first combiner 130 to the first antenna 140 and simultaneously connect the cellular high frequency diversity receiver 150 to the second antenna 160.
When the receiving performance of the second antenna 160 is greater than the receiving performance of the first antenna 140, the first switch 170 is used to switch the first combiner 130 to the second antenna 160 and switch the cellular high frequency diversity receiver 150 to the first antenna 140. It can be understood that if the receiving performance of the two is equal, the current connection state can be maintained without switching, and thus the switching times of the two can be reduced.
To prevent the switching of the first antenna 140 and the second antenna 160 from being too frequent to affect the signal receiving or transmitting performance of the mobile terminal, it is preferable that the first combiner 130 is switched from the first antenna 140 to the second antenna 160 and the cellular high frequency diversity receiver 150 is switched from the second antenna 160 to the first antenna 140 only when the receiving performance of the second antenna 160 is greater than the receiving performance of the first antenna 140 and the difference between the receiving performances of the two is greater than a preset threshold. Conversely, the switch back is only performed when the reception performance of the first antenna 140 is greater than the second antenna 160 to some extent. The predetermined threshold value can be selected according to actual experience or test results.
It can be understood that by controlling the intelligent switching between the first antenna 140 and the second antenna 160 according to the signal receiving capability of the two antennas, the situation that the GPS antenna efficiency is lowered due to holding the antenna where the GPS antenna is located can be avoided. The embodiment ensures that the GPS signal is always connected to the antenna with strong performance, thereby increasing the receiving intensity of the GPS signal, improving the use experience of the user using GPS positioning, and the like. It should be understood that, for the cellular high-frequency signal antenna, the receiving capability of the cellular high-frequency signal can be ensured to be always in a better state through the intelligent switching.
The antenna control circuit of this embodiment not only can reduce the total amount of antenna through passing through the combiner with GPS receiving path and honeycomb high frequency receiving and dispatching path and realizing the antenna sharing of honeycomb high frequency and GPS, reduces the design degree of difficulty of antenna to, because GPS is closer to with the GPS modulator, so still can reduce GPS circuit insertion loss, thereby improved GPS signal's intensity etc.. In addition, through change over switch's setting and according to the received signal ability of first antenna and second antenna realize the intelligence switching between two antennas, can guarantee that the GPS signal is connected to the antenna that the performance is strong all the time to increase the received strength of GPS signal, improve user and use experience etc..
Example 2
Referring to fig. 5, the difference between the antenna control circuit 2 of the present embodiment and the antenna control circuit 1 of the above embodiment 1 is that the antenna control circuit 2 further includes: a cellular low frequency transceiver unit 200, a cellular intermediate frequency transceiver unit 210, a second combiner 220 and a first tuning switch 230. The cellular intermediate frequency transceiver unit 210 and the cellular low frequency transceiver unit 200 are both connected to the second combiner 220, the second combiner 220 is connected to the first tuning switch 230, and the first tuning switch 230 is used to connect to the third antenna 240. Specifically, the cellular low frequency transceiving unit 200 comprises a cellular low frequency main set receiver and a cellular low frequency transmitter, and the cellular intermediate frequency transceiving unit 210 comprises a cellular intermediate frequency main set receiver and a cellular intermediate frequency transmitter. As an optional solution, the antenna control circuit 2 further includes a third antenna 240, and the third antenna 240 is configured to be connected to the first tuning switch 230.
In this embodiment, the second combiner 220 is configured to combine the cellular intermediate frequency signal and the cellular low frequency signal, output the combined signal to the first tuning switch 230, and finally transmit the tuned combined signal through the third antenna 240. It can be understood that since the cellular if and lf signals have a low operating frequency, they are switched to a desired bandwidth by the first tuning switch 230 and then transmitted through the antenna.
Further optionally, the antenna control circuit 2 further comprises a cellular low frequency diversity receiver 250, a cellular intermediate frequency diversity receiver 260, a third combiner 270 and a second tuning switch 280. The cellular intermediate frequency diversity receiver 260 and the cellular low frequency diversity receiver 250 are both connected to a third combiner 270, the third combiner 270 is connected to a second tuning switch 280, and the second tuning switch 280 is used for connecting to a fourth antenna 290. As an alternative, the antenna control circuit 2 further includes a fourth antenna 290, and the fourth antenna 290 is used for connecting with the second tuning switch 280. Exemplarily, the second combiner 220 and the third combiner 270 may each employ a two-in-one type filter based on LTCC technology, etc., and the operating frequency of the corresponding filter may be determined according to the cellular low and intermediate frequency bands.
The same principle as the diversity reception technique adopted by the cellular high frequency in embodiment 1 above, the cellular intermediate frequency and the cellular low frequency in this embodiment will also utilize the diversity reception technique to obtain diversity gain for the received cellular intermediate frequency signal or the received cellular low frequency signal, so as to improve the signal-to-noise ratio of the received signal.
Preferably, as shown in fig. 5, the antenna control circuit 2 further includes a second switch 300, and the second switch 300 is located between the second combiner 220 and the third antenna 240, and between the third combiner 270 and the fourth antenna 290. Exemplarily, the second switch 300 may be a switch having the same structure as the first switch of the above embodiment 1, such as a double-pole double-throw switch.
The second switch 300 switches the second combiner 220 and the third combiner 270 between the third antenna 240 and the fourth antenna 290, so that the cellular intermediate frequency signal or the cellular low frequency signal can be always transmitted to the antenna with stronger performance, and the transmission quality and the reception quality of the signal can be improved.
Exemplarily, when the reception performance of the third antenna 240 is greater than the reception performance of the fourth antenna 290, the second switch 300 is configured to connect the second combiner 220 to the third antenna 240, and simultaneously connect the third combiner 270 to the fourth antenna 290. When the receiving performance of the fourth antenna 290 is greater than the receiving performance of the third antenna 240, the second switch 300 is used to switch the second combiner 220 from the third antenna 240 to the fourth antenna 290, and simultaneously switch the third combiner 270 from the fourth antenna 290 to the third antenna 240.
It is further preferable that the second combiner 220 is switched from the third antenna 240 to the fourth antenna 290 while the third combiner 270 is switched from the fourth antenna 290 to the third antenna 240 only when the reception performance of the fourth antenna 290 is greater than the reception performance of the third antenna 240 and the difference between the reception performances is greater than a preset threshold. This can prevent the signal receiving or transmitting performance of the mobile terminal from being affected by the frequent switching of the third antenna 240 and the fourth antenna 290.
As another alternative, as shown in fig. 6, the antenna control circuit 2 further includes a WIFI modem 310 and a WIFI transceiving unit 320. The WIFI transceiving unit 320 is connected to the WIFI modem 310, and the WIFI transceiving unit 320 is used for connecting to the WIFI antenna 330. Optionally, the antenna control circuit 2 may further include the WIFI antenna 330.
Exemplarily, the WIFI transceiving unit 320 may include a WIFI 2.4G transceiving unit 321 and a WIFI 5G transceiving unit 322, and correspondingly, the WIFI antenna 330 includes a WIFI 2.4G antenna 331 and a WIFI 5G antenna 332. Therefore, the WIFI 2.4G transceiving unit 321 is connected to the WIFI 2.4G antenna 331, and the WIFI 5G transceiving unit 322 is connected to the WIFI 5G antenna 332, that is, two WIFI signals are respectively provided with separate antennas.
Another embodiment of the present invention also proposes a mobile terminal that supports at least cellular communication and GPS positioning functions, and the antenna control circuit design for these wireless communications may employ the antenna control circuit as in embodiment 1 or 2 above. Exemplarily, the mobile terminal may include, but is not limited to, a mobile phone, a tablet, an Ipad, and the like.
In all examples shown and described herein, any particular value should be construed as merely exemplary, and not as a limitation, and thus other examples of example embodiments may have different values.
It should be noted that: like reference numbers and letters refer to like items in the following figures, and thus, once an item is defined in one figure, it need not be further defined and explained in subsequent figures.
The above examples are merely illustrative of several embodiments of the present invention, and the description thereof is more specific and detailed, but not to be construed as limiting the scope of the invention. It should be noted that, for a person skilled in the art, several variations and modifications can be made without departing from the inventive concept, which falls within the scope of the present invention.
Claims (6)
1. An antenna control circuit, comprising: the system comprises a cellular high-frequency transceiving unit, a GPS receiver, a first combiner, a cellular high-frequency diversity receiver, a cellular intermediate-frequency transceiving unit, a cellular low-frequency transceiving unit, a second combiner, a first tuning switch, a radio frequency modem, a WIFI modem and a WIFI transceiving unit; wherein, the frequency ranges corresponding to the honeycomb high frequency, the honeycomb intermediate frequency and the honeycomb low frequency are 2300 MHz-2690 MHz, 1710 MHz-2200 MHz and 617 MHz-960 MHz in sequence;
the radio frequency modem is respectively connected with the cellular high-frequency transceiver unit and the GPS receiver, the cellular high-frequency transceiver unit and the GPS receiver are respectively connected with the first combiner, and the first combiner is used for being connected with a first antenna;
the cellular high-frequency transceiving unit comprises a cellular high-frequency main receiver and a cellular high-frequency transmitter, the cellular high-frequency main receiver is used for being connected with a second antenna, the cellular intermediate-frequency transceiving unit and the cellular low-frequency transceiving unit are both connected with the second combiner, the second combiner is connected with the first tuning switch, and the first tuning switch is used for being connected with a third antenna;
the WIFI transceiving unit is connected with the WIFI modem and is used for being connected with a WIFI antenna.
2. The antenna control circuit of claim 1, further comprising: a first changeover switch; the first change-over switch is a double-pole double-throw switch;
the first switch is used for connecting the first combiner to the first antenna and connecting the cellular high-frequency diversity receiver to the second antenna when the receiving performance of the first antenna is larger than that of the second antenna;
the first switch is further configured to switch the first combiner from the first antenna to the second antenna and switch the cellular high frequency diversity receiver from the second antenna to the first antenna when the reception performance of the second antenna is greater than the reception performance of the first antenna.
3. The antenna control circuit of claim 2, further comprising:
the first switch is used for switching the first combiner from the first antenna to the second antenna and switching the cellular high-frequency diversity receiver from the second antenna to the first antenna when the receiving performance of the second antenna is greater than the receiving performance of the first antenna and the difference between the receiving performances of the first antenna and the second antenna is greater than a preset threshold value.
4. The antenna control circuit of claim 1, wherein the cellular low frequency transceiver unit comprises a cellular low frequency main set receiver and a cellular low frequency transmitter, and wherein the cellular intermediate frequency transceiver unit comprises a cellular intermediate frequency main set receiver and a cellular intermediate frequency transmitter, and wherein the antenna control circuit further comprises: a cellular low frequency diversity receiver, a cellular intermediate frequency diversity receiver, a third combiner and a second tuning switch,
the cellular low-frequency diversity receiver and the cellular intermediate-frequency diversity receiver are both connected with the third combiner, the third combiner is connected with the second tuning switch, and the second tuning switch is used for being connected with a fourth antenna.
5. The antenna control circuit of claim 4, further comprising: a second changeover switch; the second change-over switch is a double-pole double-throw switch;
the second switch is used for connecting the second combiner to the first tuning switch and connecting the third combiner to the second tuning switch when the receiving performance of the third antenna is greater than that of the fourth antenna;
the second switch is further configured to switch the second combiner from the first tuning switch to the second tuning switch and switch the third combiner from the second tuning switch to the first tuning switch when the reception performance of the fourth antenna is greater than the reception performance of the third antenna.
6. A mobile terminal characterized in that it comprises an antenna control circuit according to any of claims 1-5.
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| CN201910709147.0A CN110429941B (en) | 2019-08-01 | 2019-08-01 | Antenna control circuit and mobile terminal |
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| CN201910709147.0A CN110429941B (en) | 2019-08-01 | 2019-08-01 | Antenna control circuit and mobile terminal |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN111586834B (en) * | 2020-04-23 | 2022-04-19 | 宇龙计算机通信科技(深圳)有限公司 | Radio frequency front-end circuit and tracker |
| CN111800149B (en) * | 2020-05-22 | 2022-03-18 | 宇龙计算机通信科技(深圳)有限公司 | Radio frequency front-end circuit and tracker |
| CN114759943B (en) * | 2020-12-29 | 2023-06-02 | 华为技术有限公司 | Radio frequency front end module, and method and device for controlling radio frequency front end module |
| CN114513218B (en) * | 2022-02-15 | 2024-05-31 | 湖南中车时代通信信号有限公司 | Connection method and system for 5G wireless terminal and train antenna |
| CN114826317B (en) * | 2022-04-12 | 2024-07-05 | Oppo广东移动通信有限公司 | Antenna device and electronic equipment |
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