CN110620591A - Frequency band splitter - Google Patents
Frequency band splitter Download PDFInfo
- Publication number
- CN110620591A CN110620591A CN201910814844.2A CN201910814844A CN110620591A CN 110620591 A CN110620591 A CN 110620591A CN 201910814844 A CN201910814844 A CN 201910814844A CN 110620591 A CN110620591 A CN 110620591A
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- Prior art keywords
- frequency
- band
- signal
- signals
- selector
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Classifications
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- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03F—AMPLIFIERS
- H03F3/00—Amplifiers with only discharge tubes or only semiconductor devices as amplifying elements
- H03F3/20—Power amplifiers, e.g. Class B amplifiers, Class C amplifiers
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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
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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
- H04B1/38—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
- H04B1/50—Circuits using different frequencies for the two directions of communication
- H04B1/52—Hybrid arrangements, i.e. arrangements for transition from single-path two-direction transmission to single-direction transmission on each of two paths or vice versa
- H04B1/525—Hybrid arrangements, i.e. arrangements for transition from single-path two-direction transmission to single-direction transmission on each of two paths or vice versa with means for reducing leakage of transmitter signal into the receiver
Abstract
The embodiment of the invention discloses a frequency band separation device, which comprises: the input end of the first frequency selector is externally connected with a first signal transceiver, and the output end of the first frequency selector is connected with the input end of the second frequency selector; the first frequency selector is used for selecting signals of a first frequency range; the output end of the second frequency selector is externally connected with second signal receiving and transmitting equipment, and the second frequency selector comprises a first band-pass filter and a band-stop filter; wherein the first band-pass filter and the band-stop filter separate the signals of the first frequency range into signals of a second frequency range and signals of a third frequency range; and the frequency interval between the signal of the second frequency band and the signal of the third frequency band is less than the preset frequency.
Description
Technical Field
The invention relates to a signal frequency band separation technology in the field of communication, in particular to frequency band separation equipment.
Background
With the development of wireless communication technology, the requirement for frequency band separation in the radio frequency circuit is higher and higher. In the two rf circuits, when the two rf bands are different and the rf band is spaced far apart, the signal interference between the two rf bands is small. However, when the two radio frequency bands are different and the radio frequency bands are closer to each other, the signal interference between the two radio frequency bands is large, and the normal use of the two radio frequency bands is influenced.
In the related art, the transmission band and the reception band of the B28 band are separated by only 10MHz, and it is difficult to separate the transmission band and the reception band using one duplexer. Therefore, B28 needs to be divided into two bands, B28a and B28B, and two duplexers are used to separate the transmitting band from the receiving band. However, the two duplexers occupy a larger area, and occupy two low-frequency ports, which increases the design difficulty.
Disclosure of Invention
In view of the above, it is desirable to provide a frequency band separating device at least for solving the problem in the related art that it is difficult to achieve space-saving and simple separation of the transmitting and receiving frequency bands.
In order to achieve the purpose, the technical scheme of the invention is realized as follows:
a frequency band separation device, the device comprising:
the input end of the first frequency selector is externally connected with first signal receiving and transmitting equipment, and the output end of the first frequency selector is connected with the input end of the second frequency selector; the first frequency selector is used for selecting signals of a first frequency range;
the output end of the second frequency selector is externally connected with a second signal transceiver, and the second frequency selector is connected with a second signal transceiver
The second frequency selector comprises a first band-pass filter and a band-stop filter; wherein the first band-pass filter and the band-stop filter separate the signals of the first frequency range into signals of a second frequency range and signals of a third frequency range; and the frequency interval between the signal of the second frequency band and the signal of the third frequency band is less than the preset frequency.
Optionally, an input end of the first band-pass filter is connected to an output end of the first frequency selector, and an output end of the first band-pass filter is externally connected to the second signal transceiver;
the input end of the band elimination filter is connected with the input end of the first band-pass filter, and the output end of the band elimination filter is externally connected with the second signal receiving and transmitting device.
Optionally, the first frequency selector includes:
and the input end of the second band-pass filter is externally connected with the first signal receiving and transmitting equipment, and the output end of the second band-pass filter is connected with the input end of the second frequency selector.
Optionally, the frequency band separating device further includes:
the input end of the power amplifier is connected with the output end of the band elimination filter, and the output end of the power amplifier is externally connected with the second signal receiving and transmitting device.
Optionally, the frequency band separating device further includes:
the input end of the low-noise amplifier is connected with the output end of the first band-pass filter, and the output end of the low-noise amplifier is externally connected with the second signal receiving and transmitting equipment.
Optionally, the frequency band separating device further includes:
the input end of the switch is externally connected with the first signal receiving and transmitting equipment, and the output end of the switch is connected with the input end of the first frequency selector.
Optionally, the center frequency points of the signal of the second frequency band and the signal of the third frequency band are the same.
Optionally, the first band-pass filter is configured to receive, based on a center frequency point and a bandwidth of the signal in the second frequency band, the signal in the second frequency band sent by the first signal transceiver device;
and the band elimination filter is used for filtering the signals of the second frequency band sent by the second signal transceiver and sending the signals of the third frequency band based on the central frequency point and the bandwidth of the signals of the second frequency band.
Optionally, a frequency interval between the signal of the second frequency band and the signal of the third frequency band is less than or equal to 20 MHz.
The frequency band separation device provided by the embodiment of the invention comprises: the input end of the first frequency selector is externally connected with first signal receiving and transmitting equipment, and the output end of the first frequency selector is connected with the input end of the second frequency selector; the first frequency selector is used for selecting signals in a first frequency range; the output end of the second frequency selector is externally connected with second signal receiving and transmitting equipment, and the second frequency selector comprises a first band-pass filter and a band-stop filter; the first band-pass filter and the band-stop filter separate signals in the first frequency range into signals in a second frequency range and signals in a third frequency range; the frequency interval between the signal of the second frequency band and the signal of the third frequency band is less than the preset frequency. Therefore, the signals in the first frequency range can be selected through the first frequency selector, the signals in the first frequency range can be separated through the second frequency selector, the second frequency range information and the third frequency range signals are separated, and the frequency interval between the separated signals in the two frequency ranges is smaller than the preset frequency, so that the occupied area of equipment is reduced, and the design difficulty is reduced.
Drawings
Fig. 1 is a schematic structural diagram of a frequency band separation device according to an embodiment of the present invention;
fig. 2 is a schematic structural diagram of another frequency band separating device according to an embodiment of the present invention;
fig. 3 is a schematic structural diagram of another frequency band separating device according to an embodiment of the present invention.
Detailed Description
The technical solution in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention.
It should be appreciated that reference throughout this specification to "an embodiment of the present invention" or "an embodiment described previously" means that a particular feature, structure or characteristic described in connection with the embodiment is included in at least one embodiment of the present invention. Thus, the appearances of the phrase "in an embodiment of the present invention" or "in the foregoing embodiments" in various places throughout the specification are not necessarily all referring to the same embodiment. Furthermore, the particular features, structures, or characteristics may be combined in any suitable manner in one or more embodiments. In various embodiments of the present invention, the sequence numbers of the above-mentioned processes do not mean the execution sequence, and the execution sequence of each process should be determined by its function and inherent logic, and should not constitute any limitation on the implementation process of the embodiments of the present invention. The above-mentioned serial numbers of the embodiments of the present invention are merely for description and do not represent the merits of the embodiments.
It should be noted that, in the embodiments of the present invention, the connection between the apparatus and the device or between the device and the device may be a direct connection between the two through a conductor, or a connection between the two through other modules, where the other modules include, but are not limited to, at least one of a filter, a voltage regulator, a transformer, and a power amplifier, or may also be a connection between the two through an energy coupling manner, so as to achieve energy exchange between the apparatus and the device or between the device and the device.
An embodiment of the present invention provides a frequency band separation device 1, as shown in fig. 1, the device including: a first frequency selector 12 and a second frequency selector 13.
The input end of the first frequency selector 12 can be externally connected with a first signal transceiver 11, and the output end of the first frequency selector 12 is connected with the input end of the second frequency selector 13; the first frequency selector 12 is arranged to select signals of a first frequency band range.
In the embodiment of the present invention, the frequency selector (including the first frequency selector 12 or the second frequency selector 13) may be one of filters, such as one of a low-pass filter, a band-stop filter, and a high-pass filter, or a combination of at least two of them. The first signal transceiving equipment 11 may comprise a first radio frequency transceiver (not shown). The Radio Frequency (RF) of the first RF transceiver refers to a Radio Frequency current, which is a short for a high-Frequency alternating current variable electromagnetic wave. Alternating current that changes less than 1000 times per second is called low frequency current, more than 10000 times is called high frequency current, and radio frequency is a high frequency current. The input end of the first frequency selector 12 receives signals including frequency ranges sent by the first radio frequency transceiver, and the first frequency selector 12 is configured to filter signals in frequency ranges other than the signals in the first frequency range, and select the signals in the first frequency range. The first frequency selector 12 is a conventional filter with a bandwidth of 100MHz, and the second frequency selector 13 is an extractor that can separate signals in the receiving band from signals in the transmitting band. For example, when the acquired signal in the frequency range is within 300-. The output end of the first frequency selector 12 is connected to the input end of the second frequency selector 13, and transmits the signal in the first frequency range to the input end of the second frequency selector 13, that is, the signal in the B28 frequency band with the rf frequency band of 703-803MHz is transmitted to the input end of the second frequency selector 13 through a wire.
And the output end of the second frequency selector 13 can be externally connected with a second signal transceiving device 16, and the second frequency selector 13 comprises a first band-pass filter 14 and a band-stop filter 15.
Wherein, the first band-pass filter 14 and the band-stop filter 15 separate the signal of the first frequency range into the signal of the second frequency range and the signal of the third frequency range; the frequency interval between the signal of the second frequency band and the signal of the third frequency band is less than the preset frequency.
In an embodiment of the present invention, a Band-Pass Filter (BPF) (which may be the first Band-Pass Filter 14) is a device that allows signals in a particular frequency Band to Pass through while shielding other frequency bands. For example, the RLC oscillation circuit is an analog band-pass filter; a Band Stop Filters (BSF), which may be a Band Stop filter 15, means that signals of a specific frequency Band are not allowed to pass, as opposed to the concept of a Band pass filter. The first band pass filter 14 separates signals of the first frequency range into signals of the second frequency range, and the band stop filter 15 separates signals of the first frequency range into signals of the third frequency range. The signal of the second frequency band is a receiving frequency band, and the signal of the third frequency band is a transmitting frequency band. The first band pass filter 14 separates the signals of the first frequency range into signals of the second frequency range, and the signals of the second frequency range are received as a receiving frequency range by the second signal transceiver device 16. The band elimination filter 15 separates the signal in the first frequency range into a signal in a third frequency range, and the signal in the third frequency range is used as a transmitting frequency range and is transmitted by the second signal transceiver device 16, and the first signal transceiver device receives the signal in the third frequency range. It is particularly stated that the separation of the signals of the first frequency range by the second frequency selector 13 into the signals of the second frequency range and the signals of the third frequency range means the selection and separation of the frequency ranges of the signals. The first signal transceiver device 11 serves as a receiving end for the signal of the third frequency band, and at the same time, serves as a transmitting end for the signal of the second frequency band. The second signal transceiver device 16 serves as a receiving end for the signal of the second frequency band, and at the same time, serves as a transmitting end for the signal of the third frequency band. Illustratively, the band range of B28 is 703-803MHz, the reception band is 703-748MHz, and the transmission band is 758-803 MHz. The signal in the first frequency range transmitted by the first signal transceiving equipment 11 passes through the first band-pass filter 14 in the second frequency selector 13, and the first band-pass filter 14 filters out the signal in the frequency range of 703-748MHz, and transmits the signal in the frequency range of 758-803MHz to the second signal transceiving equipment 16. The signal in the first frequency range sent by the second signal transceiving equipment 16 passes through the band elimination filter 15 in the second frequency selector 13, the band elimination filter 15 filters out the signal with the frequency band of 758-. And the frequency interval between the second frequency band signal and the third frequency band signal is smaller than the preset frequency, so that the receiving frequency band and the transmitting frequency band are not interfered with each other.
The frequency band separation device provided by the embodiment of the invention comprises: the input end of the first frequency selector is externally connected with first signal receiving and transmitting equipment, and the output end of the first frequency selector is connected with the input end of the second frequency selector; the first frequency selector is used for selecting signals in a first frequency range; the output end of the second frequency selector is externally connected with second signal receiving and transmitting equipment, and the second frequency selector comprises a first band-pass filter and a band-stop filter; the first band-pass filter and the band-stop filter separate signals in the first frequency range into signals in a second frequency range and signals in a third frequency range; the frequency interval between the signal of the second frequency band and the signal of the third frequency band is less than the preset frequency. Therefore, the signals in the first frequency range can be selected through the first frequency selector, the signals in the first frequency range can be separated through the second frequency selector, the second frequency range information and the third frequency range signals are separated, and the frequency interval between the separated signals in the two frequency ranges is smaller than the preset frequency, so that the occupied area of equipment is reduced, and the design difficulty is reduced.
Based on the foregoing embodiments, an embodiment of the present invention provides a frequency band separation device 1, and referring to fig. 2, the frequency band separation device 1 includes: a first frequency selector 12 and a second frequency selector 13.
The input end of the first frequency selector 12 can be externally connected with a first signal transceiver 11, and the output end of the first frequency selector 12 is connected with the input end of the second frequency selector 13; the first frequency selector 12 is arranged to select signals of a first frequency band range.
The output end of the second frequency selector 13 may be externally connected with a second signal transceiving equipment 16, and the second frequency selector 13 comprises a first band-pass filter 14 and a band-stop filter 15.
Wherein, the first band-pass filter 14 and the band-stop filter 15 separate the signal of the first frequency range into the signal of the second frequency range and the signal of the third frequency range; the frequency interval between the signal of the second frequency band and the signal of the third frequency band is less than the preset frequency.
The input end of the first band-pass filter 14 is connected to the output end of the first frequency selector 12, and the output end of the first band-pass filter 14 may be externally connected to the second signal transceiving equipment 16.
In an embodiment of the invention, the second frequency selector 13 may be an extractor comprising a band pass filter 14 and a band stop filter 15. The second signal transceiving equipment 16 may comprise a second radio frequency transceiver (not shown). The input end of the first band-pass filter 14 is connected to the output end of the first frequency selector 12, and the output end of the first band-pass filter 14 may be externally connected to a second radio frequency transceiver.
The input end of the band-stop filter 15 is connected with the input end of the first band-pass filter 14, and the output end of the band-stop filter 15 can be externally connected with the second signal transceiving equipment 16.
In the embodiment of the present invention, the band-stop filter 15 is located in the extractor, and the input end of the band-stop filter 15 is connected to the input end of the first band-pass filter 14 by wire. One third of the connection line between the band-stop filter 15 and the first band-pass filter 14 or the midpoint of the connection line may be any position of the connection line, and the position of the connection line in the implementation process of the embodiment of the present invention is not limited at all, and the connection line is connected to the output end of the first frequency selector 12 by a wired line, that is, the intersection point of the first connection line of the first band-pass filter 14 and the first frequency selector 12 and the second connection line of the first band-pass filter 14 and the band-stop filter 15 may be located at any position of the second connection line. The output end of the band-stop filter 15 may be externally connected to a second radio frequency transceiver.
The first frequency selector 12 may comprise a second band pass filter 17.
The input end of the second band-pass filter 17 may be externally connected to the first signal transceiver 11, and the output end of the second band-pass filter 17 is connected to the input end of the second frequency selector 13.
In an embodiment of the present invention, the first frequency selector 12 may include a second band-pass filter 17, and the second band-pass filter 17 is used for selecting signals in the first frequency band range. The first signal transceiver device 11 may be a first rf transceiver, the input end of the second band-pass filter 17 may be externally connected to the first rf transceiver, and the output end of the second band-pass filter 17 is connected to the input end of the extractor.
The frequency band separation device provided by the embodiment of the invention comprises: the input end of the first frequency selector is externally connected with first signal receiving and transmitting equipment, and the output end of the first frequency selector is connected with the input end of the second frequency selector; the first frequency selector is used for selecting signals in a first frequency range; the output end of the second frequency selector is externally connected with second signal receiving and transmitting equipment, and the second frequency selector comprises a first band-pass filter and a band-stop filter; the first band-pass filter and the band-stop filter separate signals in the first frequency range into signals in a second frequency range and signals in a third frequency range; the frequency interval between the signal of the second frequency band and the signal of the third frequency band is less than the preset frequency. Therefore, the signals in the first frequency range can be selected through the first frequency selector, the signals in the first frequency range can be separated through the second frequency selector, the second frequency range information and the third frequency range signals are separated, and the frequency interval between the separated signals in the two frequency ranges is smaller than the preset frequency, so that the occupied area of equipment is reduced, and the design difficulty is reduced.
Based on the foregoing embodiments, an embodiment of the present invention provides a frequency band separation device 1, and referring to fig. 3, the frequency band separation device 1 includes: a first frequency selector 12, a second frequency selector 13, a power amplifier 18, a low noise amplifier 19 and a switch 20.
The input end of the first frequency selector 12 can be externally connected with a first signal transceiver 11, and the output end of the first frequency selector 12 is connected with the input end of the second frequency selector 13; the first frequency selector 12 is arranged to select signals of a first frequency band range.
The output end of the second frequency selector 13 may be externally connected with a second signal transceiving equipment 16, and the second frequency selector 13 comprises a first band-pass filter 14 and a band-stop filter 15.
Wherein, the first band-pass filter 14 and the band-stop filter 15 separate the signal of the first frequency range into the signal of the second frequency range and the signal of the third frequency range; the frequency interval between the signal of the second frequency band and the signal of the third frequency band is less than the preset frequency.
The frequency band separating device 1 may further include a Power Amplifier (PA) 18.
The input end of the power amplifier 18 is connected to the output end of the band-stop filter 15, and the output end of the power amplifier 18 can be externally connected to the second signal transceiving equipment 16.
In the embodiment of the present invention, the power amplifier 18, referred to as "power amplifier" for short, refers to an amplifier that can generate maximum power output to drive a certain load under a given distortion rate condition. The power amplifier 18 acts as an "organized, coordinated" hub throughout the signal transmission system, in part, governing whether the overall system can provide good signal output. It is specifically stated that the input and output of the power amplifier 18 refer to ports that are connected to other devices, and do not completely represent the directionality of signal transmission. The input of the power amplifier 18 may correspond to an output of a transmission signal and the output may correspond to an input of the transmission signal. For example, in one embodiment, signals may be input from the band-stop filter 15 to the power amplifier 18, from the power amplifier 18 to the second signal transceiving equipment 16; in another embodiment, signals may be input to the power amplifier 18 from the second signal transceiving device 16 and to the band stop filter 15 from the power amplifier 18.
The frequency band separating device 1 may further comprise a switch 20.
The input end of the switch 20 may be externally connected to the first signal transceiving equipment 11, and the output end of the switch 20 is connected to the input end of the first frequency selector 12.
In the embodiment of the present invention, the input terminal of the switch 20 may be externally connected to the first rf transceiver, and the output terminal of the switch 20 is connected to the input terminal of the first frequency selector 12. Multiple radio frequency paths are arranged between the switch 20 and the first frequency selector 12, wherein the multiple radio frequency paths include paths of frequency bands of B28, B12, B71, B8 (not shown in the figure). In one possible embodiment, the switch 20 may be a single pole, eleven throw switch for selecting a desired rf path. The path of B28 band is selected in the embodiment of the present invention for further explanation. The signal is sent to the input terminal of the switch 20 through the first rf transceiver, transmitted to the rf path of B28 band through the output terminal of the switch 20, and then passed through the input terminal of the first frequency selector 12.
In a possible embodiment, the second signal transceiver device sends the baseband signal processed by the up-conversion to the power amplifier 18, so that the power amplifier 18 amplifies the received signal, and then the power amplifier 18 sends the amplified signal to the second band-pass filter 17 through the band-stop filter 15 in the extractor until the amplified signal is sent to the antenna (not shown in the figure) through the switch 20, so that the antenna sends the obtained signal to the base station (not shown in the figure), and then the base station sends the obtained signal to the first signal transceiver device.
It should be noted that in the embodiments of the present invention, the baseband signal represents the original electrical signal emitted by the information source without modulation, and is characterized by a lower frequency and a low-pass input signal. The up-conversion process represents the process of converting an input signal having a certain frequency into an output signal having a higher frequency (generally without changing the information content and modulation of the signal).
The frequency band separating device 1 may further comprise a low noise amplifier 19.
The input end of the low noise amplifier 19 is connected to the output end of the first band pass filter 14, and the output end of the low noise amplifier 19 may be externally connected to the second signal transceiving equipment 16.
In the embodiment of the present invention, a Low Noise Amplifier (LNA) 19 represents an Amplifier with a very Low Noise figure, which is used as a high frequency or intermediate frequency preamplifier of various radio receivers. In the case of amplifying a weak signal, the noise of the amplifier itself may interfere with the signal seriously, and it is desirable to reduce the noise to improve the signal-to-noise ratio of the output. In a possible embodiment, the rf signal transmitted by the first transceiver device 11 passes through the switch 20, then through the second band-pass filter 17, then to the first band-pass filter 14 of the extractor, then to the lna 19 for early suppression of as much noise as possible, and then through the second rf transceiver, after down-conversion, the signal is received by the second transceiver device.
In the embodiment of the invention, the radio frequency signal represents a modulated electric wave with a certain transmitting frequency. To be able to propagate a signal in the air, the signal must be modulated into a high Frequency or Radio Frequency (RF) signal. The down-conversion represents that an intermediate frequency signal obtained after mixing is lower than an original signal, and the purpose of down-conversion is to reduce the carrier frequency of the signal or directly remove the carrier frequency to obtain a baseband signal.
Referring to fig. 3, in an embodiment, the center frequency points of the signal of the second frequency band and the signal of the third frequency band are the same.
In the embodiment of the present invention, the radio frequency channel of B28 determined by the second band-pass filter 17 and the second frequency selector 13 is switched by the switch 20, wherein the frequency range of B28 is 703-803MHz, the central frequency points of the signal of the second frequency band and the signal of the third frequency band of the second frequency selector 13 are 780.5MHz, and the bandwidths of the signal of the second frequency band and the signal of the third frequency band are 45 MHz.
The first bandpass filter 14 is configured to receive the signal of the second frequency band transmitted by the first signal transceiver device 11 based on the center frequency point and the bandwidth of the signal of the second frequency band.
When the radio frequency signals of each frequency band pass through the switch 20 and then pass through the second band pass filter 17 with the frequency selection range of 703-. The second band pass filter sends the filtered signal to the first band pass filter 14 and the band stop filter 15 of the extractor. Since the center frequency point of the signal of the second frequency band of the first bandpass filter 14 is 780.5MHz and the bandwidth is 45MHz, the first bandpass filter 14 can filter the 703-748MHz signal and pass the 758-803MHz signal, and then the first bandpass filter 14 sends the 758-803MHz signal to the second signal transceiving equipment through the low noise amplifier 19.
The band elimination filter 15 is configured to filter, based on the center frequency point and the bandwidth of the signal in the second frequency band, the signal in the second frequency band sent by the second signal transceiver device 12, and send the signal in the third frequency band.
In the embodiment of the present invention, the central frequency points of the signal in the second frequency band and the signal in the third frequency band of the second frequency selector 13 are both 780.5MHz, and the bandwidths of the signal in the second frequency band and the signal in the third frequency band of the second frequency selector 13 are both 45 MHz. The second signal transceiving device 16 sends the baseband signal to the band stop filter 15 of the extractor through the power amplifier 18. The center frequency point of the signal in the second frequency band passing through the band elimination filter 15 is 780.5MHz and the bandwidth is 45MHz, so that the band elimination filter 15 can filter the 758-plus-803 MHz signal, and then sends the 703-plus-748 MHz signal to the second band pass filter 17 through the 703-plus-748 MHz signal.
Optionally, the frequency separation between the signals of the second frequency band and the signals of the third frequency band is less than or equal to 20 MHz. For example, the frequency interval between the signals of the second frequency band and the signals of the third frequency band may be 5MHz, 10MHz, 15MHz, or 20MHz, and it should be understood that other frequency intervals may be used, which is not listed in the embodiments of the present invention. In other embodiments, the frequency separation between the signals of the second frequency band and the signals of the third frequency band is less than or equal to 10 MHz.
The signals of the second frequency band refer to signals of the reception frequency band, and the signals of the third frequency band refer to signals of the transmission frequency band. With the device in the embodiments of the present invention, the interval between the signal of the reception band and the signal of the transmission band will be less than or equal to 20 MHz. In one possible implementation, the signal of the receiving band of B28, i.e. the signal band corresponding to the downlink is 758-.
In this way, since the frequency band interval between the uplink and the downlink of the B28 rf circuit is only 10MHz, it is difficult to separate the receiving frequency band and the transmitting frequency band by a duplexer. Therefore, the separation of the receiving frequency band and the transmitting frequency band can be realized by dividing the B28 radio frequency circuit into B28a and B28B. The B28a has an uplink of 703-725.5MHz, a downlink of 758-780.5MHz and a frequency band interval between the uplink and the downlink of B28a of 32.5 MHz. B28B has up-going 725.5-748MHz, down-going 780.5-803MHz and up-going and down-going 32.5MHz frequency band interval. The B28a and B28B separate the receive band and the transmit band of B28a and B28B through two duplexers. However, the use of two duplexers occupies a larger area, occupies two low-frequency ports, and increases the design difficulty. The device of the invention allows the frequency separation between the signals of the second frequency band and the signals of the third frequency band to be less than or equal to 20MHz by means of only two frequency selectors.
It should be noted that, for the descriptions of the same contents in this embodiment as in the other embodiments, reference may be made to the descriptions in the other embodiments, and details are not described here again.
The frequency band separation device provided by the embodiment of the invention comprises: the input end of the first frequency selector is externally connected with first signal receiving and transmitting equipment, and the output end of the first frequency selector is connected with the input end of the second frequency selector; the first frequency selector is used for selecting signals in a first frequency range; the output end of the second frequency selector is externally connected with second signal receiving and transmitting equipment, and the second frequency selector comprises a first band-pass filter and a band-stop filter; the first band-pass filter and the band-stop filter separate signals in the first frequency range into signals in a second frequency range and signals in a third frequency range; the frequency interval between the signal of the second frequency band and the signal of the third frequency band is less than the preset frequency. Therefore, the signals in the first frequency range can be selected through the first frequency selector, the signals in the first frequency range can be separated through the second frequency selector, the second frequency range information and the third frequency range signals are separated, and the frequency interval between the separated signals in the two frequency ranges is smaller than the preset frequency, so that the occupied area of equipment is reduced, and the design difficulty is reduced.
The Processor may be at least one of an Application Specific Integrated Circuit (ASIC), a Digital Signal Processor (DSP), a Digital Signal Processing Device (DSPD), a Programmable Logic Device (PLD), a Field Programmable Gate Array (FPGA), a Central Processing Unit (CPU), a controller, a microcontroller, and a microprocessor. It is understood that the electronic device implementing the above-mentioned processor function may be other electronic devices, and the embodiments of the present application are not particularly limited.
The computer-readable storage medium may be a Read Only Memory (ROM), a Programmable Read Only Memory (PROM), an Erasable Programmable Read Only Memory (EPROM), an Electrically Erasable Programmable Read Only Memory (EEPROM), a magnetic Random Access Memory (FRAM), a Flash Memory (Flash Memory), a magnetic surface Memory, an optical Disc, or a Compact Disc Read-Only Memory (CD-ROM); and may be various electronic devices such as mobile phones, computers, tablet devices, personal digital assistants, etc., including one or any combination of the above-mentioned memories.
In the several embodiments provided in the present application, it should be understood that the disclosed apparatus and method may be implemented in other ways. The above-described device embodiments are merely illustrative, for example, the division of the unit is only a logical functional division, and there may be other division ways in actual implementation, such as: multiple units or components may be combined, or may be integrated into another system, or some features may be omitted, or not implemented. In addition, the coupling, direct coupling or communication connection between the components shown or discussed may be through some interfaces, and the indirect coupling or communication connection between the devices or units may be electrical, mechanical or other forms.
The units described as separate parts may or may not be physically separate, and parts displayed as units may or may not be physical units, that is, may be located in one place, or may be distributed on a plurality of network units; some or all of the units can be selected according to actual needs to achieve the purpose of the solution of the embodiment.
In addition, all the functional units in the embodiments of the present invention may be integrated into one processing module, or each unit may be separately used as one unit, or two or more units may be integrated into one unit; the integrated unit can be realized in a form of hardware, or in a form of hardware plus a software functional unit. Those of ordinary skill in the art will understand that: all or part of the steps for implementing the method embodiments may be implemented by hardware related to program instructions, and the program may be stored in a computer readable storage medium, and when executed, the program performs the steps including the method embodiments; and the aforementioned storage medium includes: various media capable of storing program codes, such as a removable Memory device, a Read-Only Memory (ROM), a Random Access Memory (RAM), a magnetic disk, and an optical disk.
The methods disclosed in the several method embodiments provided in the present application may be combined arbitrarily without conflict to obtain new method embodiments.
Features disclosed in several of the product embodiments provided in the present application may be combined in any combination to yield new product embodiments without conflict.
The features disclosed in the several method or apparatus embodiments provided in the present application may be combined arbitrarily, without conflict, to arrive at new method embodiments or apparatus embodiments.
The above description is only for the specific embodiments of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art can easily conceive of the changes or substitutions within the technical scope of the present invention, and all the changes or substitutions should be covered within the scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the appended claims.
Claims (9)
1. A frequency band separation device, the device comprising:
the input end of the first frequency selector is externally connected with first signal receiving and transmitting equipment, and the output end of the first frequency selector is connected with the input end of the second frequency selector; the first frequency selector is used for selecting signals of a first frequency range;
the output end of the second frequency selector is externally connected with second signal receiving and transmitting equipment, and the second frequency selector comprises a first band-pass filter and a band-stop filter; wherein the first band-pass filter and the band-stop filter separate the signals of the first frequency range into signals of a second frequency range and signals of a third frequency range; and the frequency interval between the signal of the second frequency band and the signal of the third frequency band is less than the preset frequency.
2. The frequency band splitting device of claim 1,
the input end of the first band-pass filter is connected with the output end of the first frequency selector, and the output end of the first band-pass filter is externally connected with the second signal receiving and transmitting equipment;
the input end of the band elimination filter is connected with the input end of the first band-pass filter, and the output end of the band elimination filter is externally connected with the second signal receiving and transmitting device.
3. The frequency band separating device according to claim 1 or 2, wherein the first frequency selector comprises:
and the input end of the second band-pass filter is externally connected with the first signal receiving and transmitting equipment, and the output end of the second band-pass filter is connected with the input end of the second frequency selector.
4. The band separating device according to claim 1, further comprising:
the input end of the power amplifier is connected with the output end of the band elimination filter, and the output end of the power amplifier is externally connected with the second signal receiving and transmitting device.
5. The band separating device according to claim 1, further comprising:
the input end of the low-noise amplifier is connected with the output end of the first band-pass filter, and the output end of the low-noise amplifier is externally connected with the second signal receiving and transmitting equipment.
6. The band separating device according to claim 1, further comprising:
the input end of the switch is externally connected with the first signal receiving and transmitting equipment, and the output end of the switch is connected with the input end of the first frequency selector.
7. The frequency band splitting device of any one of claims 1, 2, 4, 5 and 6,
and the central frequency points of the signals of the second frequency band and the third frequency band are the same.
8. The frequency band splitting device of claim 7,
the first band-pass filter is used for receiving the signal of the second frequency band sent by the first signal transceiver device based on the central frequency point and the bandwidth of the signal of the second frequency band;
and the band elimination filter is used for filtering the signals of the second frequency band sent by the second signal transceiver and sending the signals of the third frequency band based on the central frequency point and the bandwidth of the signals of the second frequency band.
9. The frequency band splitting device of claim 1,
the frequency separation between the signals of the second frequency band and the signals of the third frequency band is less than or equal to 20 MHz.
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| CN201910814844.2A CN110620591A (en) | 2019-08-30 | 2019-08-30 | Frequency band splitter |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201910814844.2A CN110620591A (en) | 2019-08-30 | 2019-08-30 | Frequency band splitter |
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| CN110620591A true CN110620591A (en) | 2019-12-27 |
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| WO2021134478A1 (en) * | 2019-12-31 | 2021-07-08 | 华为技术有限公司 | Communication apparatus and network device |
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