CN109873657A - Two hair two of one kind receives duplex communication RF front-end circuit - Google Patents
Two hair two of one kind receives duplex communication RF front-end circuit Download PDFInfo
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Abstract
The invention discloses two hairs two of one kind to receive duplex communication RF front-end circuit, including the first coupler, the second coupler, third coupler, the 4th coupler, the first adjustable attenuator, the second adjustable attenuator, the first adjustable phase shifter, the second adjustable phase shifter, first annular device and the second circulator.Isolation between transmitting link and receives link can be increased by the design of RF front-end circuit using technical solution of the present invention.
Description
Technical field
The present invention relates to fields of communication technology, more particularly to two hair two of one kind to receive duplex communication RF front-end circuit.
Background technique
In current duplex communication system, includes mainly frequency duplex communications and time division duplex communication, pass through frequency range respectively
It divides and time slot divides to realize transmitting and received duplex communication, still, both communication technologys can be caused inevitably
Pass is endured always in the waste of frequency spectrum resource or the decline of handling capacity, therefore, the research of the full-duplex communication technology of synchronic same frequency range to the fullest extent
Note.
For the realization of the full-duplex communication of synchronic same frequency range, most important problem be how to guarantee emit link and
There are enough isolations between receives link.
Summary of the invention
The technical problem to be solved by the embodiment of the invention is that providing two hair two of one kind receives duplex communication radio-frequency front-end
Circuit can increase the isolation between transmitting link and receives link by the design of RF front-end circuit.
In order to solve the above-mentioned technical problem, the embodiment of the invention provides two hairs two of one kind to receive duplex communication radio-frequency front-end
Circuit, including it is the first coupler, the second coupler, third coupler, the 4th coupler, the first adjustable attenuator, second adjustable
Attenuator, the first adjustable phase shifter, the second adjustable phase shifter, first annular device and the second circulator；
The input terminal of first coupler is used to connect with the first transmitting end of link, and the first of first coupler is defeated
Outlet is connect by first adjustable attenuator with the first end of first adjustable phase shifter, and the of first coupler
Two output ends are connect with the first end of second circulator, the 4th end ground connection of first coupler；
The input terminal of second coupler is used to connect with the second transmitting end of link, and the first of second coupler is defeated
Outlet is connect by second adjustable attenuator with the first end of second adjustable phase shifter, and the of second coupler
Two output ends are connect with the first end of the first annular device, the 4th end ground connection of second coupler；
The input terminal of the third coupler is connect with the output end of the 4th coupler, and the of the third coupler
For connecting with the first reception chain terminal, the second output terminal of the third coupler is used for and the second receives link one output end
End connection, the 4th end ground connection of the third coupler；
The first input end of 4th coupler is connect with the second end of the first annular device, the 4th coupler
The second input terminal connect with the second end of second circulator, the 4th end of the 4th coupler is connect by first resistor
Ground；
The second end of first adjustable phase shifter with first antenna for connecting；
The second end of second adjustable phase shifter with the second antenna for connecting；
The third end of the first annular device with third antenna for connecting；
The third end of second circulator with the 4th antenna for connecting.
Further, first coupler, second coupler, the third coupler and the 4th coupler
It is the orthogonal output coupler of 3dB constant power.
Further, first adjustable attenuator and second adjustable attenuator are used to the amplitude of adjustment signal.
Further, first adjustable phase shifter and second adjustable phase shifter are used to the phase of adjustment signal.
Further, the first antenna and second antenna are transmitting antenna；The third antenna and described
Four antennas are transmitting and reception common antenna.
Further, the first antenna, second antenna, the third antenna and the 4th antenna are located at same
On straight line, and the third antenna, between the first antenna and second antenna, second antenna is located at described
Between third antenna and the 4th antenna.
Further, the spacing of second antenna and the third antenna is λ/4+n λ；Wherein, λ is signal transmitting pin
The corresponding electromagnetic wavelength of rate, n are natural number.
Further, the first antenna and the spacing of the third antenna are λ/2, second antenna and the described 4th
The spacing of antenna is λ/2；Wherein, λ is the corresponding electromagnetic wavelength of signal transmission frequencies.
Further, the first antenna and the spacing of the third antenna are λ/4, second antenna and the described 4th
The spacing of antenna is λ/4；Wherein, λ is the corresponding electromagnetic wavelength of signal transmission frequencies.
Compared with prior art, the embodiment of the invention provides two hairs two of one kind to receive duplex communication RF front-end circuit,
The circuit adjustable is declined by the first coupler, the second coupler, third coupler, the 4th coupler, the first adjustable attenuator, second
Subtract device, the first adjustable phase shifter, the second adjustable phase shifter, first annular device and the second circulator to connect and compose, before radio frequency
The design of terminal circuit can increase the isolation between transmitting link and receives link.
Detailed description of the invention
Fig. 1 is the preferred embodiment that a kind of two hair two provided by the invention receives duplex communication RF front-end circuit
Structural block diagram；
Fig. 2 is the first reception zero point region that a kind of two hair two provided by the invention receives duplex communication RF front-end circuit
Phase analysis schematic diagram；
Fig. 3 is the second reception zero point region that a kind of two hair two provided by the invention receives duplex communication RF front-end circuit
Phase analysis schematic diagram；
Fig. 4 A to Fig. 4 B is that the leakage signal of circulator provided by the invention and reflection signal generate schematic diagram；
Fig. 5 is the leakage signal and reflection letter that a kind of two hair two provided by the invention receives duplex communication RF front-end circuit
Number phase analysis schematic diagram.
Specific embodiment
Following will be combined with the drawings in the embodiments of the present invention, and technical solution in the embodiment of the present invention carries out clear, complete
Site preparation description, it is clear that described embodiments are only a part of the embodiments of the present invention, instead of all the embodiments.It is based on
Embodiment in the present invention, those of ordinary skill in the art are obtained all without creative efforts
Other embodiments shall fall within the protection scope of the present invention.
The embodiment of the invention provides two hairs two of one kind to receive duplex communication RF front-end circuit, shown in Figure 1, is this
The hair of one kind two two that invention provides receives the structural block diagram of a preferred embodiment of duplex communication RF front-end circuit, the electricity
Road includes the first coupler 101, the second coupler 102, third coupler 103, the 4th coupler 104, the first adjustable attenuator
201, the second adjustable attenuator 202, the first adjustable phase shifter 301, the second adjustable phase shifter 302, first annular device 401 and second
Circulator 402；
The input terminal of first coupler 101 is used to connect with the first transmitting end of link 501, first coupler
101 the first output end is connect by first adjustable attenuator 201 with the first end of first adjustable phase shifter 301,
The second output terminal of first coupler 101 is connect with the first end of second circulator 402, first coupler
101 the 4th end ground connection；
The input terminal of second coupler 102 is used to connect with the second transmitting end of link 601, second coupler
102 the first output end is connect by second adjustable attenuator 202 with the first end of second adjustable phase shifter 302,
The second output terminal of second coupler 102 is connect with the first end of the first annular device 401, second coupler
102 the 4th end ground connection；
The input terminal of the third coupler 103 is connect with the output end of the 4th coupler 104, the third coupling
First output end of device 103 for connecting with the first reception chain terminal 502, use by the second output terminal of the third coupler 103
It is connect in the second reception chain terminal 602, the 4th end ground connection of the third coupler 103；
The first input end of 4th coupler 104 is connect with the second end of the first annular device 401, and the described 4th
Second input terminal of coupler 104 is connect with the second end of second circulator 402, and the 4th of the 4th coupler 104 the
End is grounded by first resistor R1；
The second end of first adjustable phase shifter 301 with first antenna 701 for connecting；
The second end of second adjustable phase shifter 302 with the second antenna 702 for connecting；
The third end of the first annular device 401 with third antenna 703 for connecting；
The third end of second circulator 402 with the 4th antenna 704 for connecting.
Specifically, when two-way transmitting and two-way receive all work (under full-duplex communication state):
The first via emits signal and is transferred to the first transmitting chain road by the first transmitting end of link, goes out by aerial radiation
Before going, it is being divided into two-way constant power just by the first coupler (first via emits signal and inputs from the input terminal of the first coupler)
Hand over signal (two paths of signals respectively from the first output end and second output terminal of the first coupler export), wherein all the way signal (from
The signal of the first output end output of first coupler) successively it is sent to by the first adjustable attenuator and the first adjustable phase shifter
First antenna, and radiate by first antenna；Another way signal (the letter exported from the second output terminal of the first coupler
Number) by the second circulator (inputting from the first end of the second circulator, three-polar output) it is sent to the 4th antenna, and pass through the
Four aerial radiations are gone out.
Similarly, the second tunnel transmitting signal is transferred to the second transmitting chain road by the second transmitting end of link, is passing through antenna
Before radiateing, it is divided into two-way etc. by the second coupler (the second tunnel emits signal and inputs from the input terminal of the second coupler)
Power in-phase signal (two paths of signals is exported from the first output end and second output terminal of the second coupler respectively), wherein believing all the way
Number (from the first output end of the second coupler export signal) successively pass through the second adjustable attenuator and the second adjustable phase shifter
It is sent to the second antenna, and is gone out by the second aerial radiation；Another way signal (is exported from the second output terminal of the second coupler
Signal) by first annular device (inputting from the first end of first annular device, three-polar output) be sent to third antenna, and lead to
Third antenna is crossed to radiate.
The first via receives signal and is received by third antenna, (defeated from the third end of first annular device by first annular device
Enter, second end output) it is sent to the first input end of the 4th coupler, the second tunnel receives signal and is received by the 4th antenna, warp
It crosses the second circulator (inputting from the third end of the second circulator, second end output) and is sent to the second input of the 4th coupler
End, two-way receives signal and first passes through the synthesis of the 4th coupler, and is sent to third coupler by the output end of the 4th coupler
Input terminal, be divided into two paths of signals using third coupler, wherein all the way signal by third coupler first output
End is transferred to the first reception chain terminal, and another way signal is transferred to the second receives link by the second output terminal of third coupler
End.
Two-way transmitting signal passes through the effect of coupler and circulator respectively, is gone out by 4 aerial radiations, and pass through
The parameter setting of each device and cabling layout designs in the RF front-end circuit, can at third antenna and the 4th antenna shape
At zero point region is received, to achieve the purpose that increase the isolation between transmitting link and receives link.
Preferably, first coupler, second coupler, the third coupler and the 4th coupling
Clutch is the orthogonal output coupler of 3dB constant power.
It should be noted that the orthogonal output coupler of 3dB constant power, in an input, two output ends distinguish output power
Equal, 90 ° of phase phase difference of signal (such as inputted from the input terminal of the first coupler, from the first output end of the first coupler
Output orthogonal with second output terminal constant power), correspondingly, if the orthogonal constant amplitude input of two-way, can be superimposed in a port and export,
In another port isolation (such as from the first input end of the 4th coupler and the input of the second input terminal, in the 4th coupler
Output end superposition output, is isolated at the 4th end of the 4th coupler).
Preferably, first adjustable attenuator and second adjustable attenuator are used to the width of adjustment signal
Value.
It should be understood that in order to eliminate the interference between multiple signals need that the amplitude of multiple signals is adjusted, so as to
Amplitude is cancelled out each other when multiple signals are superimposed, thus optimize the isolation between antenna, meanwhile, letter is made using adjustable attenuator
Number amplitude it is independently adjustable, increase the flexibility ratio of design.
Preferably, first adjustable phase shifter and second adjustable phase shifter are used to the phase of adjustment signal
Position.
It should be understood that in order to eliminate the interference between multiple signals need that the phase of multiple signals is adjusted, so as to
Phase is cancelled out each other when multiple signals are superimposed, thus optimize the isolation between antenna, meanwhile, letter is made using adjustable phase shifter
Number phase it is independently adjustable, increase the flexibility ratio of design.
Preferably, the first antenna and second antenna are transmitting antenna；The third antenna and institute
Stating the 4th antenna is transmitting and reception common antenna.
Preferably, the first antenna, second antenna, the third antenna and the 4th antenna are located at
On same straight line, and the third antenna, between the first antenna and second antenna, second antenna is located at
Between the third antenna and the 4th antenna.
Preferably, the spacing of second antenna and the third antenna is λ/4+n λ；Wherein, λ is signal biography
The corresponding electromagnetic wavelength of defeated frequency, n is natural number.
Preferably, the first antenna and the spacing of the third antenna are λ/2, second antenna and described
The spacing of 4th antenna is λ/2；Wherein, λ is the corresponding electromagnetic wavelength of signal transmission frequencies.
Preferably, the first antenna and the spacing of the third antenna are λ/4, second antenna and described
The spacing of 4th antenna is λ/4；Wherein, λ is the corresponding electromagnetic wavelength of signal transmission frequencies.
It should be noted that in conjunction with above-described embodiment, in order to guarantee that the design of the RF front-end circuit can increase transmitting
Isolation between link and receives link offsets reception interference of the transmitting signal at third antenna and the 4th antenna, in reality
When the layout of border RF front-end circuit, needs to be arranged first antenna, the second antenna, third antenna and the 4th antenna and be in same
On straight line, first antenna, the second antenna, third antenna and the 4th antenna position be arranged successively for first antenna, third antenna,
The spacing of second antenna and the 4th antenna (as shown in the position of Fig. 1), first antenna and third antenna is λ/2 (or λ/4), the
The spacing of two antennas and third antenna is λ/4+n λ, and the spacing of the second antenna and the 4th antenna is λ/2 (or λ/4), and
And the parameter of adjustable attenuator and adjustable phase shifter is accordingly adjusted (for example, when first antenna and third antenna according to antenna spacing
Spacing be λ/4, the spacing of the second antenna and third antenna is λ/4, and the spacing of the second antenna and the 4th antenna is λ/4
When, the phase shift that the first adjustable phase shifter and the second adjustable phase shifter is arranged is 0 °；When the spacing of first antenna and third antenna is
The spacing of λ/2, the second antenna and third antenna is λ/4, when the spacing of the second antenna and the 4th antenna is λ/2, setting the
The phase shift of one adjustable phase shifter and the second adjustable phase shifter be 90 °), meanwhile, in PCB layout using difference cabling, it is snakelike walk
Line etc. can guarantee, optimization isolation effect identical per the phase delay on link all the way in this way.
The hair of one kind two provided by the embodiment of the present invention two receives duplex communication RF front-end circuit, can be synchronic with frequency
Increase the isolation between transmitting link and receives link when the full-duplex communication of section, eliminates with frequency self-interference.
Two hair two of one kind is provided for the embodiments of the invention below with reference to the analysis of specific signal to receive duplex communication and penetrate
The working principle of frequency front-end circuit is illustrated:
It is shown in Figure 2, it is that a kind of two hair two provided by the invention receives the first of duplex communication RF front-end circuit and connects
Receive zero point region phase analysis schematic diagram, the spacing of antenna 01 and antenna 21 is set as λ/2, and the spacing of antenna 21 and antenna 22 is set as
The spacing of λ/4, antenna 22 and antenna 02 is set as λ/2, and a λ is 360 ° corresponding, at this time adjustable phase shifter 01 and adjustable phase shifter 02
Phase shift be 0 °, per transmission link all the way on signal transmission phase delay indicated with A (by device each in RF front-end circuit
The parameter setting and cabling layout designs of part guarantee that four paths phase delays are identical), circulator 01 and circulator 02 wrap
Three ports are included, when signal is inputted from a port, second port can only be transferred to along the direction of the arrow, and in third
A port isolation.
Specifically, the transmitting signal that first via transmitting 01 issues is transferred to coupler 01 by transmitting link, through overcoupling
Device 01 generates two-way constant power orthogonal signalling, and phase is respectively -180 ° and -90 °, and -180 ° of corresponding signals successively pass through adjustable
Attenuator 01 and adjustable phase shifter 01 reach antenna 01, are -180 ° of+A (referred to as first by the signal phase that antenna 01 gives off
Road signal), first via signal is -180 ° of+A- λ/2=-180 °+A- relative to the corresponding phase delay in 21 place of receiving antenna
180 °=- 360 °+A；- 90 ° of corresponding signals reach antenna 02, the signal phase given off by antenna 02 by circulator 02
For -90 ° of+A (referred to as second road signal), second road signal relative to the corresponding phase delay in 21 place of receiving antenna be -90 °+
- 90 °=- 360 °+A of A- λ/2- λ/4=-90 °+A-180 °.
The transmitting signal that second tunnel transmitting 22 issues is transferred to coupler 02 by transmitting link, generates by coupler 02
Two-way constant power orthogonal signalling, phase are respectively -180 ° and -90 °, and -90 ° of corresponding signals successively pass through 21 He of adjustable attenuator
Adjustable phase shifter 22 reaches antenna 22, is -90 ° of+A (referred to as third road signal) by the signal phase that antenna 22 gives off, the
Three road signals are+A-90 °=- 180 °+A of -90 ° of+A- λ/4=-90 ° relative to the corresponding phase delay in 21 place of receiving antenna；-
180 ° of corresponding signals reach antenna 21 by circulator 01, by the signal phase that antenna 21 gives off be -180 ° of+A (referred to as
4th road signal).
Then signal of the antenna 22 at antenna 21, with the signal phase of antenna 01 and antenna 02 at antenna 21 on the contrary, phase
Poor 180 °, at receiving antenna 21, that is, have between the+the four road signal of first via signal+second road signal and third road signal
Phase difference is [- 360 ° of+A+ (- 360 ° of+A)]-[- 180 ° of+A+ (- 180 ° of+A)]=0 °, therefore generates phase cancellation effect, also
It is to say, the first reception zero point region is formd at antenna 21.
It is shown in Figure 3, it is that a kind of two hair two provided by the invention receives the second of duplex communication RF front-end circuit and connects
Receive zero point region phase analysis schematic diagram, similarly with above-mentioned analytic process, the first via transmitting 01 issue transmitting signal relative to
The corresponding phase delay in 02 place of receiving antenna is respectively -180 ° of -90 ° -180 ° of+A-180 ° of+A- λ/2- λ/4- λ/2=-180 °
=-270 ° of+A and -90 ° of+A, the transmitting signal that the second tunnel transmitting 22 issues prolong relative to the corresponding phase in 02 place of receiving antenna
Slow respectively -180 ° of -180 °=- 90 °+A of+A- λ/4- λ/2=-180 °+A-90 ° and -90 ° of+A-180 ° of+A- λ/2=-90 °=-
270 ° of+A, then signal of the antenna 01 at antenna 02, with the signal phase of antenna 21 and antenna 22 at antenna 02 on the contrary, differing
180 °, that is, have [- 270 ° of+A+ (- 90 ° of+A)]-[- 90 ° of+A+ (- 270 ° of+A)]=0 °, therefore generate phase cancellation effect, also
It is to say, the second reception zero point region is formd at antenna 02.
Since antenna 02 and antenna 21 are transmitting and receive common antenna, in order to make to emit link and receives link every
From, it joined circulator 01 and circulator 02 in RF front-end circuit, it, can be with the characteristics of using circulator signal one-way transmission
Make to emit and receive isolation.
It should be noted that antenna 01, antenna 02 and antenna 22 and the spacing of antenna 21 are different, the space that signal passes through
Decay also different, by adjustable attenuator 01 and the adjustable signal amplitude of adjustable attenuator 21, so that signal is receiving day
Amplitude at line 21 is offset, when the spacing of the spacing of antenna 01 and antenna 21, antenna 02 and antenna 22 takes other values, by adjustable
Phase shifter 01 and the adjustable signal phase of adjustable phase shifter 22, so that phase cancellation of the signal at receiving antenna 21, therefore
Optimal neutralization effect can be obtained by adjusting antenna spacing.
But in actual use, since circulator can not accomplish ideal situation, when signal is inputted from a port
When, there is signal output in second port along the direction of the arrow, and third port can not be completely isolated at this time, has seldom portion
Divide energy leakage to third port, is that the leakage signal of circulator provided by the invention generates schematic diagram, ring as shown in Figure 4 A
Shape device receives transmitting signal from port 1, is transferred to antenna end by port 2, can accordingly generate leakage signal in port 3, by
It is often tens dB weaker than transmitting signal in reception signal useful in practice, therefore even if there is extremely least a portion of energy leakage,
Signal reception can be caused significantly to influence.
In addition, the reflection for receiving the also antenna end being affected to signal is as shown in Figure 4 B ring provided by the invention
The reflection signal of shape device generates schematic diagram, and circulator receives transmitting signal from port 1, is transferred to antenna end by port 2, sends out
When penetrating signal and being transferred to antenna port, since impedance discontinuity can generate reflection signal, and is exported by port 3, reflect signal
It is consistent with the transmitting transmission direction of signal that circulator receives, it is difficult to eliminate.
The hair of one kind two provided by the embodiment of the present invention two receives in duplex communication RF front-end circuit, by emitting
End and receiving end introduce coupler, can effectively eliminate the leakage signal and reflection signal of transmitting signal, further increase transmitting
The isolation of link and receives link, specifically, it is shown in Figure 5, it is that a kind of two hair two provided by the invention receives duplexing lead to
The leakage signal and reflection signal phase for believing RF front-end circuit analyze schematic diagram, according to above-mentioned analytic process:
The transmitting signal that first via transmitting 01 issues successively generates the first leakage letter after coupler 01 and circulator 02
Number 1., phase is that (B indicates -90 ° of outputs from coupler 01 to -90 ° of+B, arrives circulator 02, then prolong to the phase of coupler 04
Late), and generate the first reflection signal 2., phase be -90 ° of+C (C indicates -90 ° of outputs from coupler 01, arrives circulator 02,
Cause to reflect at antenna 02, return the phase delay of coupler 04).
The transmitting signal that second tunnel transmitting 22 issues successively generates the second leakage letter after coupler 02 and circulator 01
Number 3., phase is that (B indicates -180 ° of outputs from coupler 02 to -180 ° of+B, arrives circulator 01, then prolong to the phase of coupler 04
Late), and the second reflection signal is generated 4., phase is that (C indicates -180 ° of outputs from coupler 02 to -180 ° of+C, arrives circulator
01, cause to reflect at antenna 21, return the phase delay of coupler 04).
The first leakage signal in two-way receives link 1. 90 ° of phase phase difference with the second leakage signal 3., amplitude is identical,
2. the first reflection signal in two-way receives link reflects 90 ° of phase phase difference of signal 4. with second, amplitude is identical；Wherein, two
Road phase delay B is identical, two-way phase delay C is identical and the identical condition of signal amplitude are as follows: guarantees two-way device performance one
It causes, cabling phase delay is identical；Then according to coupler principle, the first reflection signal 2. 4. will be in coupler with the second reflection signal
04 port 4 is superimposed output, and by eliminating reflection with loading to, offsets in port 3；1. first leakage signal is let out with second
It is consistent with reflection signal to reveal the elimination principle of signal 3., repeats no more；Therefore, after coupler 04, useful reception signal
It is output to coupler 03 from the port of coupler 04 3, then divides by coupler 03 and is transferred to corresponding reception for two paths of signals
Link.
The above is only a preferred embodiment of the present invention, it is noted that for the ordinary skill people of the art
For member, without departing from the technical principles of the invention, several improvement and deformations can also be made, these improvement and deformations
Also it should be regarded as protection scope of the present invention.
Claims (9)
1. two hair two of one kind receives duplex communication RF front-end circuit, which is characterized in that including the first coupler, the second coupling
Device, third coupler, the 4th coupler, the first adjustable attenuator, the second adjustable attenuator, the first adjustable phase shifter, second can
Adjust phase shifter, first annular device and the second circulator；
The input terminal of first coupler is used to connect with the first transmitting end of link, the first output end of first coupler
It is connect by first adjustable attenuator with the first end of first adjustable phase shifter, the second of first coupler is defeated
Outlet is connect with the first end of second circulator, the 4th end ground connection of first coupler；
The input terminal of second coupler is used to connect with the second transmitting end of link, the first output end of second coupler
It is connect by second adjustable attenuator with the first end of second adjustable phase shifter, the second of second coupler is defeated
Outlet is connect with the first end of the first annular device, the 4th end ground connection of second coupler；
The input terminal of the third coupler is connect with the output end of the 4th coupler, and the first of the third coupler is defeated
For connecting with the first reception chain terminal, the second output terminal of the third coupler is used to connect with the second reception chain terminal outlet
It connects, the 4th end ground connection of the third coupler；
The first input end of 4th coupler is connect with the second end of the first annular device, and the of the 4th coupler
Two input terminals are connect with the second end of second circulator, and the 4th end of the 4th coupler is grounded by first resistor；
The second end of first adjustable phase shifter with first antenna for connecting；
The second end of second adjustable phase shifter with the second antenna for connecting；
The third end of the first annular device with third antenna for connecting；
The third end of second circulator with the 4th antenna for connecting.
2. two hair two as described in claim 1 receives duplex communication RF front-end circuit, which is characterized in that first coupling
Device, second coupler, the third coupler and the 4th coupler are the orthogonal output coupler of 3dB constant power.
3. two hair two as described in claim 1 receives duplex communication RF front-end circuit, which is characterized in that described first is adjustable
Attenuator and second adjustable attenuator are used to the amplitude of adjustment signal.
4. two hair two as described in claim 1 receives duplex communication RF front-end circuit, which is characterized in that described first is adjustable
Phase shifter and second adjustable phase shifter are used to the phase of adjustment signal.
5. two hair two as described in claim 1 receives duplex communication RF front-end circuit, which is characterized in that the first antenna
It is transmitting antenna with second antenna；The third antenna and the 4th antenna are transmitting and reception common antenna.
6. two hair two as claimed in claim 5 receives duplex communication RF front-end circuit, which is characterized in that described first day
Line, second antenna, the third antenna and the 4th antenna are located along the same line, and the third antenna is located at institute
It states between first antenna and second antenna, second antenna is between the third antenna and the 4th antenna.
7. two hair two as claimed in claim 6 receives duplex communication RF front-end circuit, which is characterized in that second antenna
Spacing with the third antenna is λ/4+n λ；Wherein, λ is the corresponding electromagnetic wavelength of signal transmission frequencies, and n is natural number.
8. two hair two as claimed in claim 6 receives duplex communication RF front-end circuit, which is characterized in that the first antenna
It is λ/2 with the spacing of the third antenna, the spacing of second antenna and the 4th antenna is λ/2；Wherein, λ is signal
The corresponding electromagnetic wavelength of transmission frequency.
9. two hair two as claimed in claim 6 receives duplex communication RF front-end circuit, which is characterized in that the first antenna
It is λ/4 with the spacing of the third antenna, the spacing of second antenna and the 4th antenna is λ/4；Wherein, λ is signal
The corresponding electromagnetic wavelength of transmission frequency.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910195781.7A CN109873657B (en) | 2019-03-14 | 2019-03-14 | Two-sending and two-receiving full duplex communication radio frequency front-end circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910195781.7A CN109873657B (en) | 2019-03-14 | 2019-03-14 | Two-sending and two-receiving full duplex communication radio frequency front-end circuit |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN109873657A true CN109873657A (en) | 2019-06-11 |
| CN109873657B CN109873657B (en) | 2020-10-30 |
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Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20120106525A1 (en) * | 2010-10-29 | 2012-05-03 | Ontario, Canada) | Mobile wireless communications device having a single bluetooth / wireless local area network antenna and associated methods |
| CN203057147U (en) * | 2013-01-28 | 2013-07-10 | 北京澳丰源科技发展有限公司 | Transmit-receive commutation circuit of bilateral amplifier |
| CN206323376U (en) * | 2016-04-29 | 2017-07-11 | 湖北工业大学 | A kind of zero notch bandwidth self adaptation is from leakage signal suppression system |
| CN207869103U (en) * | 2018-03-05 | 2018-09-14 | 西安彼睿电子科技有限公司 | A kind of full duplex communication system |
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Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20120106525A1 (en) * | 2010-10-29 | 2012-05-03 | Ontario, Canada) | Mobile wireless communications device having a single bluetooth / wireless local area network antenna and associated methods |
| CN203057147U (en) * | 2013-01-28 | 2013-07-10 | 北京澳丰源科技发展有限公司 | Transmit-receive commutation circuit of bilateral amplifier |
| CN206323376U (en) * | 2016-04-29 | 2017-07-11 | 湖北工业大学 | A kind of zero notch bandwidth self adaptation is from leakage signal suppression system |
| CN207869103U (en) * | 2018-03-05 | 2018-09-14 | 西安彼睿电子科技有限公司 | A kind of full duplex communication system |
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