CN109638458B - Antenna isolation adjusting system - Google Patents
Antenna isolation adjusting system Download PDFInfo
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- CN109638458B CN109638458B CN201811555371.0A CN201811555371A CN109638458B CN 109638458 B CN109638458 B CN 109638458B CN 201811555371 A CN201811555371 A CN 201811555371A CN 109638458 B CN109638458 B CN 109638458B
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01Q—ANTENNAS, i.e. RADIO AERIALS
- H01Q1/00—Details of, or arrangements associated with, antennas
- H01Q1/52—Means for reducing coupling between antennas; Means for reducing coupling between an antenna and another structure
- H01Q1/521—Means for reducing coupling between antennas; Means for reducing coupling between an antenna and another structure reducing the coupling between adjacent antennas
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01Q—ANTENNAS, i.e. RADIO AERIALS
- H01Q1/00—Details of, or arrangements associated with, antennas
- H01Q1/52—Means for reducing coupling between antennas; Means for reducing coupling between an antenna and another structure
- H01Q1/521—Means for reducing coupling between antennas; Means for reducing coupling between an antenna and another structure reducing the coupling between adjacent antennas
- H01Q1/523—Means for reducing coupling between antennas; Means for reducing coupling between an antenna and another structure reducing the coupling between adjacent antennas between antennas of an array
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01Q—ANTENNAS, i.e. RADIO AERIALS
- H01Q21/00—Antenna arrays or systems
Abstract
The present disclosure relates to the field of communication technology, and provides an antenna isolation adjustment system, which includes a base station radio frequency circuit, a signal cancellation circuit, a first antenna and a second antenna, wherein the signal cancellation circuit is coupled with the base station radio frequency circuit, the first antenna and the second antenna; the signal cancellation circuit is used for coupling a first cancellation signal generated based on a first antenna signal transmitted by the base station radio frequency circuit to the second antenna so as to cancel the first cancellation signal and a first leakage signal leaked from the first antenna to the second antenna. Compared with the prior art, the first cancellation signal is generated by the signal cancellation circuit and is cancelled by the first leakage signal, the separation degree between the antennas is improved, and meanwhile, the additional area cannot be increased.
Description
Technical Field
The present disclosure relates to the field of communications technologies, and in particular, to an antenna isolation adjustment system.
Background
With the development of communication technology, more and more antennas need to be integrated on the same communication device, coupling between the antennas can cause signal interference and efficiency reduction, and in order to ensure normal operation between the antennas and avoid mutual interference, the isolation between the antennas needs to be improved. At present, generally adopt to add methods such as baffle, PCB (Printed Circuit Board) grooving and promote the antenna isolation, but, add the baffle and can lead to the communication equipment complete machine grow, the PCB grooving can lead to the PCB Board grow, and these two kinds of modes are obviously not conform to the demand that electronic device integrates more and more. Therefore, how to improve the antenna isolation without increasing additional area is a technical problem that researchers need to solve urgently.
Disclosure of Invention
It is an object of the present disclosure to provide an antenna isolation adjustment system to improve the above-mentioned problems.
In order to achieve the above purpose, the technical scheme adopted by the disclosure is as follows:
in a first aspect, the present disclosure provides an antenna isolation adjustment system, which includes a base station rf circuit, a signal cancellation circuit, a first antenna, and a second antenna, where the signal cancellation circuit is coupled to the base station rf circuit, the first antenna, and the second antenna; the signal cancellation circuit is configured to couple a first cancellation signal generated based on a first antenna signal transmitted by the base station radio frequency circuit to the second antenna, so as to cancel the first cancellation signal and a first leakage signal leaked from the first antenna to the second antenna.
In a second aspect, the present disclosure also provides an antenna isolation adjustment system, where the antenna isolation adjustment system includes a base station radio frequency circuit, a signal cancellation circuit, a first antenna, and a second antenna; the signal cancellation circuit comprises a first coupling end and a second coupling end, the first coupling end is electrically connected between the base station radio frequency circuit and the first antenna, and the second coupling end is electrically connected between the base station radio frequency circuit and the second antenna; a first transmission path is formed among the base station radio frequency circuit, the first coupling end, the second coupling end and the second antenna so as to transmit a first cancellation signal generated based on a first antenna signal transmitted by the base station radio frequency circuit to the second antenna.
Compared with the prior art, the antenna isolation adjusting system provided by the disclosure can couple the first cancellation signal generated based on the first antenna signal transmitted by the base station radio frequency circuit to the second antenna by setting the signal cancellation circuit coupled with the base station radio frequency circuit, the first antenna and the second antenna, so that the first leakage signal leaked from the space to the second antenna with the first antenna is cancelled, the isolation between the antennas is improved, and the extra area is not increased.
In order to make the aforementioned and other objects, features and advantages of the present invention comprehensible, preferred embodiments accompanied with figures are described in detail below.
Drawings
To more clearly illustrate the technical solutions of the present disclosure, the drawings needed for the embodiments will be briefly described below, it should be understood that the following drawings only illustrate some embodiments of the present disclosure, and therefore should not be considered as limiting the scope, and those skilled in the art can also obtain other related drawings based on the drawings without inventive efforts.
Fig. 1 shows a block schematic diagram of an antenna isolation adjustment system provided by the present disclosure.
Fig. 2 shows a signal flow diagram of an antenna isolation adjustment system provided by the present disclosure.
Fig. 3 shows a block schematic diagram of an antenna isolation adjustment system provided by the present disclosure.
Fig. 4 shows a block schematic diagram of a signal cancellation circuit provided by the present disclosure.
Fig. 5 shows a block schematic diagram of a signal cancellation circuit provided by the present disclosure.
Icon: 100-an antenna isolation adjustment system; 110-base station radio frequency circuitry; 120-a signal cancellation circuit; 121-a first coupler; 122-amplitude modulation phase modulation circuit; 1221-a tuneable phase shifter; 1222-a bi-directionally adjustable amplifier; 1223-microstrip phase shifter; 1224-a bidirectional adjustable voltage controlled attenuator; 123-a second coupler; 130-a first antenna; 140-second antenna.
Detailed Description
The technical solutions in the present disclosure will be described clearly and completely with reference to the accompanying drawings in the present disclosure, and it is to be understood that the described embodiments are only a part of the embodiments of the present disclosure, and not all of the embodiments. The components of the present disclosure, as generally 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 disclosure, presented in the figures, is not intended to limit the scope of the claimed disclosure, but is merely representative of selected embodiments of the disclosure. All other embodiments, which can be derived by a person skilled in the art from the embodiments of the disclosure without making creative efforts, shall fall within the protection scope of the disclosure.
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. Meanwhile, in the description of the present disclosure, the terms "first", "second", and the like are used only for distinguishing the description, and are not to be construed as indicating or implying relative importance.
As small base station devices are increasingly multi-mode and multi-band, a Multiple Input Multiple Output (MIMO) technology becomes the most important technical means for increasing communication capacity and improving spectrum utilization. The MIMO technology breaks through the theoretical limit of Shannon capacity, converts the generally considered unfavorable multipath attenuation into favorable factors, and fully utilizes the random attenuation and the possible multipath propagation to improve the wireless data transmission rate, so that the capacity of wireless transmission can reach the level of wired transmission.
Meanwhile, the MIMO system employs a multi-antenna technology, and in order to ensure independence between multiple transmit/receive channels, each antenna in the multi-antenna array must have a high antenna isolation. However, since the small-sized base station device is small in size, the space left for multiple antennas is small, and it is difficult to improve the isolation between the antennas. Based on this, the present disclosure provides an antenna isolation adjustment system 100 applied to a small base station device, where the antenna isolation adjustment system 100 may form reverse co-radiation superposition of a spatial leakage signal between antennas and a PCB return signal of each antenna, so as to generate an analog cancellation effect, and then improve isolation between the antennas, which is described in detail below.
Referring to fig. 1, fig. 1 is a block diagram illustrating an antenna isolation adjustment system 100 provided by the present disclosure. The antenna isolation adjustment system 100 includes a base station rf circuit 110, a signal cancellation circuit 120, a first antenna 130, and a second antenna 140, wherein the signal cancellation circuit 120 is coupled to the base station rf circuit 110, the first antenna 130, and the second antenna 140.
In this embodiment, the base station radio frequency circuitry 110 may transmit a first antenna signal from the first antenna 130 and transmit a second antenna signal from the second antenna 140. The base station rf circuit 110 may be a Remote Radio Unit (RRU) in a small base station device, and the RRU may convert a baseband optical signal into a first antenna signal and a second antenna signal at a Remote end, and transmit the first antenna signal and the second antenna signal from the first antenna 130 and the second antenna 140, respectively.
In the present embodiment, the first antenna 130 and the second antenna 140 may be 2 × 2MIMO antennas, 4 × 4MIMO antennas, or the like. In other words, the first antenna 130 may be an antenna including one receiving and one transmitting, or may be an antenna including a plurality of receiving and a plurality of transmitting; similarly, the second antenna 140 may be an antenna including one receiving and one transmitting, or may be an antenna including a plurality of receiving and a plurality of transmitting. In addition, the frequency of the first antenna signal transmitted by the first antenna 130 and the frequency of the second antenna signal transmitted by the second antenna 140 are the same.
In this embodiment, since the small base station device has a relatively small size, the self-isolation between the first antenna 130 and the second antenna 140 is limited, and the first antenna signal transmitted by the first antenna 130 may leak to the second antenna 140, which affects the sensitivity of the second antenna 140 for receiving signals; similarly, the second antenna signal transmitted by the second antenna 140 may leak to the first antenna 130, which affects the sensitivity of the first antenna 130 for receiving signals.
In order to solve the above problem, the signal cancellation circuit 120 needs to be constructed to improve the antenna isolation between the first antenna 130 and the second antenna 140. The signal cancellation circuit 120 includes a first coupling terminal ab electrically connected between the base station rf circuit 110 and the first antenna 130, and a second coupling terminal cd electrically connected between the base station rf circuit 110 and the second antenna 140.
The signal cancellation circuit 120 is configured to couple a first cancellation signal generated based on a first antenna signal transmitted by the base station rf circuit 110 to the second antenna 140, so as to cancel the first cancellation signal and a first leakage signal leaked from the first antenna 130 to the second antenna 140. Referring to fig. 2, the first antenna signal transmitted by the base station rf circuit 110 is denoted by S1, when the first antenna 130 transmits the first antenna signal S1, the first antenna signal S1 leaks to the second antenna 140 through the space, and the first leakage signal leaking from the first antenna 130 to the second antenna 140 is denoted by S1_ space. To reduce or eliminate the effect of the first leaked signal S1_ space on the second antenna 140, a first cancellation signal S1_ circuit is generated by the signal cancellation circuit 120 and coupled to the second antenna 140 such that the first cancellation signal S1_ circuit and the first leaked signal S1_ space cancel.
The signal cancellation circuit 120 is further configured to couple a second cancellation signal generated based on a second antenna signal transmitted by the base station rf circuit 110 to the first antenna 130, so as to cancel the second cancellation signal and a second leakage signal leaked from the second antenna 140 to the first antenna 130. Referring to fig. 2, the second antenna signal transmitted by the base station rf circuit 110 is denoted by S2, when the second antenna 140 transmits the second antenna signal S2, the second antenna signal S2 leaks to the first antenna 130 through space, and the second leakage signal leaking from the second antenna 140 to the first antenna 130 is denoted by S2_ space. To reduce or eliminate the effect of the second leakage signal S2_ space on the first antenna 130, a second cancellation signal S2_ circuit is generated by the signal cancellation circuit 120 and coupled to the first antenna 130 such that the second cancellation signal S2_ circuit and the second leakage signal S2_ space cancel.
Since the frequencies of the first and second antenna signals are the same, the frequencies of the first and second canceling signals S1_ circuit and S2_ circuit are the same, and the frequencies of the first and second canceling signals S3578 _ circuit and S2_ circuit are the same. In addition, the first canceling signal S1_ circuit and the second antenna signal may be superimposed, and the second canceling signal S2_ circuit and the first antenna signal may also be superimposed, so long as the first canceling signal S1_ circuit cancels the first leakage signal S1_ space and the second canceling signal S2_ circuit cancels the second leakage signal S2_ space, so that the isolation between the first antenna 130 and the second antenna 140 can be improved.
In other words, in the present embodiment, a first transmission path is formed between the base station rf circuit 110, the first coupling terminal ab, the second coupling terminal cd and the second antenna 140, and the first transmission path can transmit a first cancellation signal S1_ circuit generated based on the first antenna signal S1 transmitted by the base station rf circuit 110 to the second antenna 140, so that the first cancellation signal S1_ circuit is cancelled with the first leakage signal S1_ space spatially leaked from the first antenna 130 to the second antenna 140. Incorporated into fig. 2, the first transmission path may be denoted a-c-D and may transmit a first pair of cancellation signals S1_ circuit such that the first pair of cancellation signals S1_ circuit and the first leakage signal S1_ space via a-B-D cancel.
Meanwhile, a second transmission path is formed between the base station rf circuit 110, the second coupling terminal cd, the first coupling terminal ab, and the first antenna 130, and the second transmission path may transmit a second cancellation signal S2_ circuit generated based on a second antenna signal S2 transmitted by the base station rf circuit 110 to the first antenna 130, so that the second cancellation signal S2_ circuit and a second leakage signal S2_ space leaked by the second antenna 140 to the first antenna 130 through space cancel each other. Incorporated into fig. 2, the second transmission path may be denoted by C-a-B, and the second transmission path may transmit a second pair of cancellation signals S2_ circuit such that the second pair of cancellation signals S2_ circuit and the second leakage signal S2_ space via C-D-B cancel.
It should be noted that the first cancellation signal S1_ circuit and the first leakage signal S1_ space are not limited to cancellation at the second antenna 140, and may also be cancelled at a certain node of the RRU radio frequency link corresponding to the second antenna 140, and a specific node location user may be flexibly set according to an actual situation, which is not limited herein. Similarly, the second cancellation signal S2_ circuit and the second leakage signal S2_ space are not limited to cancellation at the first antenna 130, and may also be cancelled at a certain node of the RRU radio frequency link corresponding to the first antenna 130, and a specific node location user may be flexibly set according to an actual situation, which is not limited herein.
Referring to fig. 3, the signal cancellation circuit 120 includes a first coupler 121, an amplitude modulation and phase modulation circuit 122 and a second coupler 123, the first coupler 121 is electrically connected between the base station rf circuit 110 and the first antenna 130, the second coupler 123 is electrically connected between the base station rf circuit 110 and the second antenna 140, and the amplitude modulation and phase modulation circuit 122 is electrically connected between the first coupler 121 and the second coupler 123.
In this embodiment, the first coupler 121 is configured to obtain a first antenna signal S1 from the base station radio frequency circuit 110; a second coupler 123, configured to obtain a second antenna signal S2 from the base station radio frequency circuit 110; the amplitude modulation and phase modulation circuit 122 is configured to perform amplitude modulation and phase modulation on the first antenna signal S1 to obtain a first cancellation signal S1_ circuit, and perform amplitude modulation and phase modulation on the second antenna signal S2 to obtain a second cancellation signal S2_ circuit.
Referring to fig. 4, the am phase modulation circuit 122 includes a tunable phase shifter 1221 and a bi-directional tunable amplifier 1222, and the first coupler 121, the tunable phase shifter 1221, the bi-directional tunable amplifier 1222 and the second coupler 123 are electrically connected in sequence. Since the insertion loss requirement of the coupler is relatively small, so that the coupling ratio is relatively high, the first coupler 121 and the second coupler 123 with fixed coupling ratio can be designed in the design stage, and in the actual use process, the phase and the amplitude of the first cancellation signal pair S1_ circuit and the second cancellation signal pair S2_ circuit are adjusted by adjusting the parameters of the tunable phase shifter 1221 and the bidirectional tunable amplifier 1222, so as to reduce or eliminate the first leakage signal S1_ space leaked from the first antenna 130 to the second antenna 140 and the second leakage signal S2_ space leaked from the second antenna 140 to the first antenna 130.
To achieve cancellation of the first cancellation signal S1_ circuit and the first leakage signal S1_ space, and cancellation of the second cancellation signal S2_ circuit and the second leakage signal S2_ space, it is necessary to satisfy that the first cancellation signal S1_ circuit and the first leakage signal S1_ space are equal in amplitude and opposite in phase, and that the second cancellation signal S2_ circuit and the second leakage signal S2_ space are equal in amplitude and opposite in phase. The process of canceling first leakage signal S1_ space and second leakage signal S2_ space by adjusting the parameters of tunable phase shifter 1221 and bi-directionally tunable amplifier 1222 is described below in conjunction with fig. 2 and 4:
taking the first antenna 130 as an example, assume that the phase of the first antenna signal S1 generated by the base station rf circuit 110 is
The amplitude E is the amplitude, and the first antenna signal S1 has two transmission paths, i.e. a-B-D leaking to the second antenna 140 through the space, and the phase of the first leaking signal S1_ space reaching the second antenna 140 through the transmission path is the phase of the first leaking signal S1_ space due to the loss of the space and the phase change of the signal caused by the transmission distance
An amplitude p × E, where p represents an amplitude ratio of the first leakage signal S1_ space to the first antenna signal S1;
the second antenna 140 is reached through the signal cancellation circuit 120, i.e., a-c-D, the signal cancellation circuit 120 includes a first coupler 121, an adjustable phase shifter 1221, a bidirectional adjustable amplifier 1222, a second coupler 123 of the second coupler 123 and other connecting devices, wherein the phase difference and amplitude variation caused by the first coupler 121 and the second coupler 123 are respectively the phase difference and amplitude variation
p1 × E, phase difference brought by the tunable phase shifter 1221 is
The amplitude variation of the bi-directionally tunable amplifier 1222 is p2 × E, and the phase difference and amplitude variation of the other connected devices are p2 × E
p3 × E; therefore, the phase of the first cancellation signal S1_ circuit arriving at the second antenna 140 through this transmission path is
Amplitude p1 × p2 × p3 × E;
in order to achieve the cancellation effect, it is necessary that the first leakage signal S1_ space and the first cancellation signal S1_ circuit transmitted through the two transmission paths reach the second antenna 140 with equal amplitudes and opposite phases, that is, it is satisfied that
And p-p 1 p2 p3, wherein k is 0, ± 1, ± 2, …. And in the practical application, the light-emitting diode is used,
and p, p1, p3 are fixed, so that now only the adjustable phase shifter 1221 and the bi-directionally adjustable amplifier 1222 need be adjusted according to the above equations, by adjusting the corresponding ones
And p2, namely, the function of signal cancellation can be achieved.
Similarly, for the second antenna 140, the second leakage signal S2_ space transmitted through the space, i.e., C-D-B, and the second cancellation signal S2_ circuit transmitted through the signal cancellation circuit 120, i.e., C-a-B, are equal in amplitude and opposite in phase when reaching the first antenna 130, i.e., the signal cancellation function is achieved by adjusting the parameters of the adjustable phase shifter 1221 and the bidirectional adjustable amplifier 1222, and the specific analysis process is similar to that of the first antenna 130, and will not be described herein again.
It can be understood that, in an actual application process, the phase difference value between the first cancellation signal and the first leakage signal may be allowed to be within a first preset error range, and the amplitude ratio between the first cancellation signal and the first leakage signal may be allowed to be within a second preset error range; similarly, the phase difference value between the second cancellation signal and the second leakage signal may be allowed to be within a first preset error range, and the amplitude ratio between the second cancellation signal and the second leakage signal may be within a second preset error range. As long as the first leakage signal S1_ space can be reduced by the first cancellation signal S1_ circuit and the second leakage signal S2_ space can be reduced by the second cancellation signal S2_ circuit, the antenna isolation between the first antenna 130 and the second antenna 140 can be improved.
As an embodiment, the first preset error range may be ± 10 °, and the second preset error range may be ± 20%. Incorporated into the above example, for the first antenna 130, only the adjustable phase shifter 1221 and the bi-directionally adjustable amplifier 1222 need be adjusted such that the formula
And p1 p2 p3 (1 ± 20%) are true, i.e., the isolation between the antennas can be improved.
In another embodiment, referring to fig. 5, the amplitude modulation and phase modulation circuit 122 includes a microstrip phase shifter 1223 and a bidirectional adjustable voltage-controlled attenuator 1224, and the first coupler 121, the microstrip phase shifter 1223, the bidirectional adjustable voltage-controlled attenuator 1224, and the second coupler 123 are electrically connected in sequence. Similarly, the first coupler 121 and the second coupler 123 with fixed coupling degrees may be designed at the design stage, and during the actual use, the phases and amplitudes of the first cancellation signal S1_ circuit and the second cancellation signal S2_ circuit are adjusted by adjusting the parameters of the microstrip phase shifter 1223 and the bidirectional adjustable voltage-controlled attenuator 1224, so as to reduce or eliminate the first leakage signal S1_ space leaked from the first antenna 130 to the second antenna 140 and the second leakage signal S2_ space leaked from the second antenna 140 to the first antenna 130. The specific adjustment process is similar to the adjustment of the adjustable phase shifter 1221 and the bi-directional adjustable amplifier 1222, and is not described in detail here.
The working principle of the antenna isolation adjustment system 100 provided by the present disclosure is:
first, for the first antenna 130, a first transmission path is formed among the base station rf circuit 110, the first coupling terminal ab, the second coupling terminal cd and the second antenna 140, and the first transmission path may transmit a first cancellation signal S1_ circuit generated based on a first antenna signal S1 transmitted by the base station rf circuit 110 to the second antenna 140, so that the first cancellation signal S1_ circuit is cancelled with a first leakage signal S1_ space leaked from the first antenna 130 to the second antenna 140 through space, thereby improving the inter-antenna separation;
second, for the second antenna 140, a second transmission path is formed between the base station rf circuit 110, the second coupling terminal cd, the first coupling terminal ab, and the first antenna 130, and the second transmission path can transmit a second cancellation signal S2_ circuit generated based on a second antenna signal S2 transmitted by the base station rf circuit 110 to the first antenna 130, so that the second cancellation signal S2_ circuit is cancelled with a second leakage signal S2_ space spatially leaked from the second antenna 140 to the first antenna 130, thereby improving the inter-antenna separation.
Compared with the prior art, the method has the following beneficial effects:
in the prior art, isolation between antennas is generally improved by methods of adding a baffle plate, grooving a PCB and the like, but adding the baffle plate can cause the whole communication equipment to be enlarged, and grooving the PCB can cause the PCB to be enlarged. The present disclosure couples a first cancellation signal S1_ circuit generated based on a first antenna signal S1 transmitted by the base station rf circuit 110 to the second antenna 140 by providing the signal cancellation circuit 120, such that the first cancellation signal S1_ circuit cancels a first leakage signal S1_ space leaked by the first antenna 130 from space to the second antenna 140; meanwhile, the second canceling signal S2_ circuit generated based on the second antenna signal S2 transmitted by the base station rf circuit 110 is coupled to the first antenna 130, so that the second canceling signal S2_ circuit and the second leakage signal S2_ space leaked from the second antenna 140 to the first antenna 130 cancel each other, which improves the coupling degree between antennas.
In summary, the antenna isolation adjustment system provided by the present disclosure includes a base station rf circuit, a signal cancellation circuit, a first antenna, and a second antenna, where the signal cancellation circuit is coupled to the base station rf circuit, the first antenna, and the second antenna; the signal cancellation circuit is used for coupling a first cancellation signal generated based on a first antenna signal transmitted by the base station radio frequency circuit to the second antenna so as to cancel the first cancellation signal and a first leakage signal leaked from the first antenna to the second antenna. Compared with the prior art, the first cancellation signal generated by the first antenna signal transmitted by the base station radio frequency circuit is coupled to the second antenna by the signal cancellation circuit, so that the first cancellation signal leaked from the space to the second antenna with the first antenna is cancelled, the separation degree between the antennas is improved, and the additional area is not increased.
It is noted that, herein, relational terms such as first and second, and the like may be used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Also, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising an … …" does not exclude the presence of other identical elements in a process, method, article, or apparatus that comprises the element.
The above description is only a preferred embodiment of the present disclosure and is not intended to limit the present disclosure, and various modifications and changes may be made to the present disclosure by those skilled in the art. Any modification, equivalent replacement, improvement and the like made within the spirit and principle of the present disclosure should be included in the protection scope of the present disclosure. 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.
Claims (5)
1. An antenna isolation adjusting system is characterized by being applied to small base station equipment and comprising a base station radio frequency circuit, a signal cancellation circuit, a first antenna and a second antenna, wherein the signal cancellation circuit is coupled with the base station radio frequency circuit, the first antenna and the second antenna; the first antenna and the second antenna are both MIMO antennas, and the frequency of a first antenna signal transmitted by the first antenna is the same as that of an antenna signal transmitted by the second antenna;
the signal cancellation circuit is used for coupling a first cancellation signal generated based on a first antenna signal transmitted by the base station radio frequency circuit to the second antenna so as to cancel the first cancellation signal and a first leakage signal leaked from the first antenna to the second antenna;
the signal cancellation circuit is further configured to couple a second cancellation signal generated based on a second antenna signal transmitted by the base station radio frequency circuit to the first antenna, so as to cancel the second cancellation signal and a second leakage signal leaked from the second antenna to the first antenna;
the signal cancellation circuit comprises a first coupler, an amplitude modulation and phase modulation circuit and a second coupler, wherein the first coupler is electrically connected between the base station radio frequency circuit and the first antenna, the second coupler is electrically connected between the base station radio frequency circuit and the second antenna, and the amplitude modulation and phase modulation circuit is electrically connected between the first coupler and the second coupler;
the first coupler is used for acquiring the first antenna signal from the base station radio frequency circuit;
the second coupler is configured to obtain the second antenna signal from the base station radio frequency circuit;
the amplitude modulation and phase modulation circuit is used for carrying out amplitude modulation and phase modulation on the first antenna signal to obtain the first cancellation signal and carrying out amplitude modulation and phase modulation on the second antenna signal to obtain the second cancellation signal;
the amplitude modulation and phase modulation circuit comprises an adjustable phase shifter and a bidirectional adjustable amplifier, and the first coupler, the adjustable phase shifter, the bidirectional adjustable amplifier and the second coupler are electrically connected in sequence; or, the amplitude modulation and phase modulation circuit comprises a microstrip phase shifter and a bidirectional adjustable voltage-controlled attenuator, and the first coupler, the microstrip phase shifter, the bidirectional adjustable voltage-controlled attenuator and the second coupler are electrically connected in sequence.
2. The antenna isolation adjustment system of claim 1, wherein the signal cancellation circuit comprises a first coupling end and a second coupling end, the first coupling end being electrically connected between the base station radio frequency circuit and the first antenna, the second coupling end being electrically connected between the base station radio frequency circuit and the second antenna.
3. The antenna isolation adjustment system of claim 1, wherein a phase difference value of the first cancellation signal and the first leakage signal is within a first preset error range, and an amplitude ratio of the first cancellation signal and the first leakage signal is within a second preset error range;
the phase difference value of the second cancellation signal and the second leakage signal is within a first preset error range, and the amplitude ratio of the second cancellation signal and the second leakage signal is within a second preset error range.
4. The antenna isolation adjustment system of claim 3, wherein the first cancellation signal is equal in amplitude and opposite in phase to the first leakage signal, and the second cancellation signal is equal in amplitude and opposite in phase to the second leakage signal.
5. An antenna isolation adjusting system is characterized by being applied to small base station equipment and comprising a base station radio frequency circuit, a signal cancellation circuit, a first antenna and a second antenna; the first antenna and the second antenna are both MIMO antennas, and the frequency of a first antenna signal transmitted by the first antenna is the same as that of an antenna signal transmitted by the second antenna; the signal cancellation circuit comprises a first coupling end and a second coupling end, the first coupling end is electrically connected between the base station radio frequency circuit and the first antenna, and the second coupling end is electrically connected between the base station radio frequency circuit and the second antenna;
a first transmission path is formed among the base station radio frequency circuit, the first coupling end, the second coupling end and the second antenna so as to transmit a first cancellation signal generated based on a first antenna signal transmitted by the base station radio frequency circuit to the second antenna; a second transmission path is formed among the base station radio frequency circuit, the second coupling end, the first coupling end and the first antenna so as to transmit a second cancellation signal generated based on a second antenna signal transmitted by the base station radio frequency circuit to the first antenna;
the signal cancellation circuit comprises a first coupler, an amplitude modulation and phase modulation circuit and a second coupler, wherein the first coupler is electrically connected between the base station radio frequency circuit and the first antenna, the second coupler is electrically connected between the base station radio frequency circuit and the second antenna, and the amplitude modulation and phase modulation circuit is electrically connected between the first coupler and the second coupler;
the first coupler is used for acquiring the first antenna signal from the base station radio frequency circuit;
the second coupler is configured to obtain the second antenna signal from the base station radio frequency circuit;
the amplitude modulation and phase modulation circuit is used for carrying out amplitude modulation and phase modulation on the first antenna signal to obtain the first cancellation signal and carrying out amplitude modulation and phase modulation on the second antenna signal to obtain the second cancellation signal;
the amplitude modulation and phase modulation circuit comprises an adjustable phase shifter and a bidirectional adjustable amplifier, and the first coupler, the adjustable phase shifter, the bidirectional adjustable amplifier and the second coupler are electrically connected in sequence; or, the amplitude modulation and phase modulation circuit comprises a microstrip phase shifter and a bidirectional adjustable voltage-controlled attenuator, and the first coupler, the microstrip phase shifter, the bidirectional adjustable voltage-controlled attenuator and the second coupler are electrically connected in sequence.
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| CN201811555371.0A CN109638458B (en) | 2018-12-19 | 2018-12-19 | Antenna isolation adjusting system |
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| CN201811555371.0A CN109638458B (en) | 2018-12-19 | 2018-12-19 | Antenna isolation adjusting system |
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| CN109638458B true CN109638458B (en) | 2022-02-11 |
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| CN110829023B (en) * | 2019-11-15 | 2021-11-02 | Oppo广东移动通信有限公司 | Antenna module and terminal |
| CN110829025B (en) * | 2019-11-15 | 2021-11-12 | Oppo广东移动通信有限公司 | Antenna module, terminal and method for adjusting antenna isolation |
| CN113659337A (en) * | 2020-05-12 | 2021-11-16 | 西安电子科技大学 | Antenna device, electronic apparatus, and decoupling method for antenna device |
| CN111786697A (en) * | 2020-07-30 | 2020-10-16 | 维沃移动通信有限公司 | Antenna control system and electronic equipment |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102237906A (en) * | 2010-04-20 | 2011-11-09 | 英特赛尔美国股份有限公司 | Systems and methods for improving antenna isolation using signal cancellation |
| EP2683027A1 (en) * | 2012-07-06 | 2014-01-08 | BlackBerry Limited | Methods and apparatus to control mutual coupling between antennas |
| DE102009018648B4 (en) * | 2009-04-23 | 2018-11-29 | Snaptrack, Inc. | Front end module with antenna tuner |
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| US10581156B2 (en) * | 2016-05-04 | 2020-03-03 | Qorvo Us, Inc. | Compensation circuit to mitigate antenna-to-antenna coupling |
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Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE102009018648B4 (en) * | 2009-04-23 | 2018-11-29 | Snaptrack, Inc. | Front end module with antenna tuner |
| CN102237906A (en) * | 2010-04-20 | 2011-11-09 | 英特赛尔美国股份有限公司 | Systems and methods for improving antenna isolation using signal cancellation |
| EP2683027A1 (en) * | 2012-07-06 | 2014-01-08 | BlackBerry Limited | Methods and apparatus to control mutual coupling between antennas |
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