CN102045075A - Wireless signal receiver - Google Patents
Wireless signal receiver Download PDFInfo
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- CN102045075A CN102045075A CN2010105178394A CN201010517839A CN102045075A CN 102045075 A CN102045075 A CN 102045075A CN 2010105178394 A CN2010105178394 A CN 2010105178394A CN 201010517839 A CN201010517839 A CN 201010517839A CN 102045075 A CN102045075 A CN 102045075A
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Abstract
The present invention discloses a wireless signal receiver which only causes the transmission of a target signal, restrains and eliminates a useless signal when the useless signal that has a frequency different from that of the target signal, particularly the useless signal which has the frequency that is approximately with a secondary harmonic frequency of the target signal. The wireless signal receiver (1) comprises antennae (10A,10B), a branch mixing circuit (1) and an output terminal (20). The branch mixing circuit (1) comprises transmission line patterns (111,112,113,114) which respectively have a line length of lambaS1/4 relatively to a wavelength lambdaS1 of the target signal (S1). The transmission line patterns (111,112,113,114) are connected to a ring. The antenna (10A) is connected with a connection point (201) of the transmission line patterns (111,112). The antenna (10B) is connected with a connection point (204) of the transmission line patterns (111,114). The output terminal (20) is connected with a connection point (203) of the transmission line patterns (113,114).
Description
Technical field
The present invention relates to a kind of wireless signal receiving system by the antenna receiving communication signal, even particularly a kind of by antenna receiving target signal and unwanted signal, the also wireless signal receiving system of an export target signal.
Background technology
In the past, the various communicators that utilize antenna to carry out the communication of wireless signal had been designed.And, for this communicator, wish only to carry out the communication of echo signal, suppress and elimination echo signal unwanted signal in addition.
Therefore, in the transmitting-receiving subassembly of 1 record of patent documentation for example, dispose the distribution synthesizer in transtation mission circuit one side of the circulator that is connected with antenna.According to this structure, this transmitting-receiving subassembly offers antenna with will sending the signal lossless consumption, makes the reflecting component decay from the useless transmission signal of antenna in distributing synthesizer, protection transmitting system circuit.
Patent documentation 1: the Japan Patent spy opens the 2007-19827 communique
Summary of the invention
Yet, the miniaturization day by day when realizing multifunction of current communicator, for example, current portable formula telephone device also has the function of receiving broadcast signal in the transmitting-receiving conversation signal.In this case, in portable phone unit, in compact shell, signal of communication must be disposed with antenna is close with dual-mode antenna and broadcast singal.
Yet, in current frequency specification, the frequency band of the second harmonic of above-mentioned broadcast singal sometimes with the band overlapping of signal of communication.In this case, the signal of communication of receiving and dispatching with antenna by communication might be broadcasted signal and receive with antenna, and flows into to demodulator circuit.This signal of communication is a unwanted signal for reception, the demodulating system of broadcast singal, must suppress and eliminate.
In addition, because that the unwanted signal that receives by antenna is the frequency band of signal of communication is different with broadcast singal, therefore,, also can't suppress and eliminate this signal of communication effectively even adopt the such structure of above-mentioned patent documentation 1.
The objective of the invention is to realize a kind of radio communication receiving circuit, even this radio communication receiving circuit receives the roughly the same unwanted signal of second harmonic frequency of the frequency unwanted signal different with echo signal, particularly frequency and echo signal, also only allow echo signal pass through, suppress and the elimination unwanted signal.
(1) wireless signal receiving system of the present invention comprises two reception antennas and at least one lead-out terminal.And this wireless signal receiving system comprises the received signal transfer circuit that is configured between two reception antennas and the lead-out terminal.In addition, the received signal transfer circuit has many transfer paths that echo signal that two reception antennas are received respectively and unwanted signal transmit.These many transfer paths are sent to lead-out terminal with echo signal, and unwanted signal is sent to lead-out terminal in the mode that becomes the opposite relation of phase place.
In this structure,, export from lead-out terminal to a plurality of received signal former states that lead-out terminal transmits from two reception antennas for echo signal.On the other hand, for unwanted signal, since opposite in the position of lead-out terminal phase place from two reception antennas to a plurality of received signals that lead-out terminal transmits, therefore cancel out each other.At this moment, the transmission of this different frequency signals and cancel out each other and only realize by forming many transmission lines.
(2) in addition, wireless signal receiving system of the present invention forms by have the branch line hybrid circuit of a plurality of ports with many transfer paths that are connected between these a plurality of ports.And a plurality of ports of branch line hybrid circuit comprise the output port that connects with lead-out terminal, two antenna ports and the independent port different with antenna port with output port that is connected with two reception antennas.
This structure illustrates the situation of branch line hybrid circuit as the physical circuit that above-mentioned unwanted signal is cancelled out each other that adopt.And, by adopting this branch line hybrid circuit, can form the circuit that functions as described above simply.
(3) in addition, two of wireless signal receiving system of the present invention antenna ports are arranged in the two ends of a transfer path of many transfer paths.
In this structure, be illustrated in the structure more specifically that connects two reception antennas on the above-mentioned branch line hybrid circuit.
(4) in addition, in wireless signal receiving system of the present invention, unwanted signal is that frequency is the signal of the twice of echo signal.
In this structure, the physical relationship of the frequency of above-mentioned echo signal and unwanted signal is shown, be under the situation of this relation, can obtain special effective function effect.
(5) in addition, connect by the transmission lines pattern between each port of the branch line hybrid circuit of wireless signal receiving system of the present invention, this transmission lines pattern is that line length is 1/4 a electrode pattern of the wavelength of echo signal.
In this structure, the concrete structure between each port of branch line hybrid circuit is shown.In addition, form, thereby can realize the branch line hybrid circuit with very simple structure by only utilizing the transmission lines pattern.
(6) in addition, be connected by the lumped parameter type phase-shift circuit that constitutes by coil part and capacitor element between each port of the branch line hybrid circuit of wireless signal receiving system of the present invention.
In this structure, the concrete structure between each port of branch line hybrid circuit is shown, illustrate and utilize lumped parameter type phase-shift circuit to connect situation between each port.Adopt this lumped parameter type circuit, also can obtain the above-mentioned effect that allows echo signal pass through, suppress and eliminate unwanted signal.
(7) in addition, be connected by the lumped parameter type phase-shift circuit that constitutes by coil part and varicap element between each port of the branch line hybrid circuit of wireless signal receiving system of the present invention.And the received signal transfer circuit also comprises the control circuit that the varicap element is applied control voltage.
In this structure, the structure that can adjust the amount of phase shift of this phase-shift circuit in the above-mentioned lumped parameter type phase-shift circuit is shown.And in this structure, if change control voltage, then corresponding to the control voltage level, the electric capacity of varicap changes, and amount of phase shift changes.Thus, can not only be single-frequency with the frequency setting of echo signal and unwanted signal, and can be set at the arbitrary frequency in the predetermined frequency band.Can enlarge to allow echo signal pass through, suppress and eliminate the frequency range of unwanted signal.
(8) in addition, the lumped parameter type phase-shift circuit of wireless signal receiving system of the present invention is the circuit structure of 1/4 line length that is equivalent to the wavelength of echo signal.
This structure illustrates the benchmark of the physical circuit pattern of above-mentioned lumped parameter type phase-shift circuit.
(9) in addition, the present invention relates to communications component.This communications component comprises the wireless signal receiving system that has the above-mentioned structure that each is put down in writing and the television broadcasting signal of UHF frequency band is received as echo signal.And communications component comprises that with frequency be the signal of communication receiving and transmitting part that the signal of twice of the frequency of television broadcasting signal is received and dispatched as the signal of communication that can become unwanted signal.
In this structure, the communications component as the concrete device that adopts above-mentioned wireless signal receiving system is shown.This communications component for example is the portable telephone terminal that has the television broadcasting signal receiving function, and the frequency band that the portable telephone communication signal is shown is the situation of doubled frequency of the television broadcasting signal of UHF frequency band.In this case, even receive the portable telephone communication signal by the reception antenna of television broadcasting signal, this portable telephone communication signal also can be suppressed and eliminate, and the television broadcasting signal of UHF frequency band also can former state be sent to the demodulator circuit of back level etc.
(10) in addition, the frequency in the communications component of the present invention is that the signal of twice of the frequency of television broadcasting signal is the transmission signal of signal of communication.
In this structure, more specifically, the doubled frequency that the television broadcasting signal of UHF frequency band is shown is the situation of frequency of the transmission signal of signal of communication.Because the signal level that sends signal than received signal height, therefore as the easier problem that becomes of unwanted signal, but by adopting this structure, can suppress and eliminate this transmission signal.
Even receive the frequency unwanted signal different with echo signal, also can only allow echo signal pass through, suppress and the elimination unwanted signal.At this moment, even beyond transfer circuit, do not use independent filter element, filter circuit, also can suppress and eliminate unwanted signal.
Description of drawings
Fig. 1 is the circuit structure diagram of the radio receiver 1 of embodiments of the present invention 1.
Fig. 2 is the schematic diagram of movements when receiving echo signal in the explanation radio receiver shown in Figure 1.
Fig. 3 is the schematic diagram of movements when receiving echo signal in the explanation radio receiver shown in Figure 1.
Fig. 4 is the circuit structure diagram of the radio receiver 1C of embodiments of the present invention 2.
Fig. 5 is the circuit structure diagram of the radio receiver 1VC of embodiments of the present invention 3.
Label declaration
10A, 10B reception antenna
11 branch line hybrid circuits
110A, 110B, 110C, 110D input/output port
111,112,113,114 transmission lines patterns
20 lead-out terminals
201,202,203,204 port tie points
21,31 lumped parameter type branch line hybrid circuits
211,212,213,214 lumped parameter type phase-shift circuits
311,312,313,314 lumped parameter type variable phase shifter circuits
Embodiment
With reference to accompanying drawing, embodiments of the present invention 1 related wireless signal receiving system is described.Particularly, the represented wireless signal receiving system of present embodiment is the wireless signal receiving system that receives the television broadcasting signal of UHF frequency band, is loaded into Tape movement Digital Television (Japanese: the portable telephone terminal of broadcast receiving function (" communications component " that be equivalent to invent) ワ Application セ グ).Thereby, in the following description, echo signal is that (television broadcasting signal of 470MHz～860MHz), unwanted signal is equivalent to the transmission signal in the portable telephone communication signal of about doubled frequency of this television broadcasting signal, particularly this signal of communication to the UHF frequency band.
Fig. 1 is the circuit structure diagram of the radio receiver 1 of present embodiment.As shown in Figure 1, radio receiver 1 comprises two antenna 10A, 10B, branch line hybrid circuit 11 and lead-out terminal 20.
Branch line hybrid circuit 11 comprises four input/ output port 110A, 110B, 110C, 110D, and, have four transmission lines patterns 111,112,113,114.Transmission lines pattern 111,112,113,114 is for example realized by the electrode pattern that is formed on the predetermined dielectric base plate.Transmission lines pattern 111,112,113,114 constitutes one side respectively and is configured to square.These transmission lines pattern 111,112,113,114 modes with the chain of rings form.Particularly, an end of transmission lines pattern 111 is connected with an end of transmission lines pattern 112, and the other end of transmission lines pattern 112 is connected with an end of transmission lines pattern 113.And the other end of transmission lines pattern 113 is connected with an end of transmission lines pattern 114, and the other end of transmission lines pattern 114 is connected with the other end of transmission lines pattern 111.
In addition, to form line length identical for all transmission lines patterns 111,112,113,114.This line length is set at following length: behind the relative dielectric constant and relative permeability of the dielectric base plate of considering to be formed with this transmission lines pattern 111,112,113,114, be the wavelength X of echo signal
S11/4.
The connecting portion of each transmission lines pattern of this branch line hybrid circuit 11 is connected with input/ output port 110A, 110B, 110C, the 110D of branch line hybrid circuit 11 respectively, and this input/ output port 110A, 110B, 110C, 110D constitute respectively and can be connected with external circuit.
Particularly, the tie point 201 of transmission lines pattern 111 and transmission lines pattern 112 is connected with input/output port 110A (being equivalent to " antenna port " of the present invention), and this input/output port 110A is connected with antenna 10A.The tie point 204 of transmission lines pattern 111 and transmission lines pattern 114 is connected with input/output port 110D (being equivalent to " antenna port " of the present invention), and this input/output port 110D is connected with antenna 10B.The tie point 203 of transmission lines pattern 114 and transmission lines pattern 113 is connected with input/output port 110C (being equivalent to " output port " of the present invention), and this input/output port 110C is connected with lead-out terminal 20.In addition, in the present embodiment, input/output port 110B is connected with the tie point 202 of transmission lines pattern 112 and transmission lines pattern 113, though the linking objective of not shown this input/output port 110B, but for example, or be connected with the terminal equal, or pass through resistance-grounded system with lead-out terminal 20.
In addition, these input/ output ports 110A, 110B, 110C, 110D are the input and output portions of playing the function that each tie point with branch line hybrid circuit 21 is connected with external circuits such as antenna 110A, 110B, lead-out terminals 20, the precalculated position that can represent electrode pattern also can have the special terminals structure.And, similarly, lead-out terminal 20 also is the functional efferent of wireless signal receiving system 1, if this wireless signal receiving system 1 forms one with late-class circuit, then even without the special terminals structure, the precalculated position of the electrode that their are connected also can become lead-out terminal 20.
By utilizing this structure, echo signal S1 and frequency are the states shown in below the unwanted signal S2 of the twice of this echo signal S1 becomes.
(1) for echo signal S1
Fig. 2 is the schematic diagram of movements when receiving echo signal in the explanation radio receiver 1 shown in Figure 1, the situation that Fig. 2 (A) expression antenna 10A is receiving, the situation that Fig. 2 (B) expression antenna 10B is receiving.In addition, in Fig. 2, omit input/output port 110A, the 110B shown in Fig. 1, the diagram of 110C, 110D.
At first, shown in Fig. 2 (A), the echo signal S1 that receives by antenna 10A sends the tie point 201 of branch line hybrid circuit 11 to.Echo signal S1 produces bifurcated at tie point 201, and signal S1A sends transmission lines pattern 111 to behind the bifurcated, and signal S1A ' sends transmission lines pattern 112 to behind the bifurcated.
By transmission lines pattern 111, signal S1A is offset λ in the phase place of tie point 204 with respect to tie point 201 behind the bifurcated
S1/ 4.And by transmission lines pattern 114, signal S1A further is offset λ in the phase place of tie point 203 with respect to tie point 204 behind the bifurcated
S1/ 4.That is, signal S1A is offset λ in the phase place of tie point 203 with respect to tie point 201 behind the bifurcated
S1/ 2.
By transmission lines pattern 112, signal S1A ' is offset λ in the phase place of tie point 202 with respect to tie point 201 behind the bifurcated
S1/ 4.And by transmission lines pattern 113, signal S1A ' further is offset λ in the phase place of tie point 203 with respect to tie point 202 behind the bifurcated
S1/ 4.That is, signal S1A ' is offset λ in the phase place of tie point 203 with respect to tie point 201 behind the bifurcated
S1/ 2.
Like this, behind the bifurcated that sends behind signal S1A and the bifurcated signal S1A ' send lead-out terminal 20 in tie point 203 additions.Here, as mentioned above, behind the bifurcated behind signal S1A and the bifurcated signal S1A ' all be offset λ in the phase place of tie point 203 with respect to tie point 201
S1/ 2.That is, behind the bifurcated behind signal S1A and the bifurcated signal S1A ' carry out addition with same phase.Therefore, become the simple addition of signal S1A ' behind the signal S1A and bifurcated behind the bifurcated from the output signal S1Aout of lead-out terminal 20, become the echo signal S1 that receives (S1Aout=S1A+S1A '=S1).
On the other hand, shown in Fig. 2 (B), the echo signal S1 that receives by antenna 10B sends the tie point 204 of branch line hybrid circuit 11 to.Echo signal S1 produces bifurcated at tie point 204, and signal S1B sends transmission lines pattern 114 to behind the bifurcated, and signal S1B ' sends transmission lines pattern 111 to behind the bifurcated.
By transmission lines pattern 114, signal S1B is offset λ in the phase place of tie point 203 with respect to tie point 204 behind the bifurcated
S1/ 4.
By transmission lines pattern 111, signal S1B ' is offset λ in the phase place of tie point 201 with respect to tie point 204 behind the bifurcated
S1/ 4.And by transmission lines pattern 112, signal S1B ' further is offset λ in the phase place of tie point 202 with respect to tie point 201 behind the bifurcated
S1/ 4.In addition, by transmission lines pattern 113, signal S1B ' further is offset λ in the phase place of tie point 203 with respect to tie point 202 behind the bifurcated
S1/ 4.That is, signal S1B ' is offset 3 λ in the phase place of tie point 203 with respect to tie point 204 behind the bifurcated
S1/ 4.
Like this, behind the bifurcated that sends behind signal S1B and the bifurcated signal S1B ' send lead-out terminal 20 in tie point 203 additions.Here, as mentioned above, signal S1B is offset λ in the phase place of tie point 203 with respect to tie point 201 behind the bifurcated
S1/ 4, signal S1B ' is offset 3 λ in the phase place of tie point 203 with respect to tie point 201 behind the bifurcated
S1/ 4.That is, behind the bifurcated behind signal S1B and the bifurcated signal S1B ' carry out addition with opposite phase (180 ° of phase differences).Therefore, become behind the bifurcated cancelling out each other of signal S1B ' behind the signal S1B and bifurcated, become " 0 " (S1Bout=S1B+S1B '=0) from the output signal S1Bout of lead-out terminal 20.
As mentioned above, echo signal S1 is under situation about receiving by antenna 10A, 10B, and output signal S1Aout is with respect to echo signal S1, and only phase place is offset, and is the signal of same level.
(2) for unwanted signal S2
Fig. 3 is the schematic diagram of movements when receiving unwanted signal in the explanation radio receiver 1 shown in Figure 1, the situation that Fig. 3 (A) expression antenna 10A is receiving, the situation that Fig. 3 (B) expression antenna 10B is receiving.
At first, shown in Fig. 3 (A), the echo signal S2 that receives by antenna 10A sends the tie point 201 of branch line hybrid circuit 11 to.Unwanted signal S2 produces bifurcated at tie point 201, and signal S2A sends transmission lines pattern 111 to behind the bifurcated, and signal S2A ' sends transmission lines pattern 112 to behind the bifurcated.
Here because the frequency of unwanted signal S2 is the twice of the frequency of echo signal S1 as described above, therefore, the line length of each transmission lines pattern 111,112,113,114 be unwanted signal S2 wavelength 1/2.
Thereby by transmission lines pattern 111, signal S2A is offset λ in the phase place of tie point 204 with respect to tie point 201 behind the bifurcated
S2/ 2.And by transmission lines pattern 114, signal S2A further is offset λ in the phase place of tie point 203 with respect to tie point 204 behind the bifurcated
S2/ 2.That is, signal S2A is offset λ in the phase place of tie point 203 with respect to tie point 201 behind the bifurcated
S2
By transmission lines pattern 112, signal S2A ' is offset λ in the phase place of tie point 202 with respect to tie point 201 behind the bifurcated
S2/ 2.And by transmission lines pattern 113, signal S2A ' further is offset λ in the phase place of tie point 203 with respect to tie point 202 behind the bifurcated
S2/ 2.That is, signal S2A ' is offset λ in the phase place of tie point 203 with respect to tie point 201 behind the bifurcated
S2
Behind the bifurcated that sends like this behind signal S2A and the bifurcated signal S2A ' send lead-out terminal 20 in tie point 203 additions.Here, as mentioned above, behind the bifurcated behind signal S2A and the bifurcated signal S2A ' all be offset λ in the phase place of tie point 203 with respect to tie point 201
S2That is, behind the bifurcated behind signal S2A and the bifurcated signal S2A ' carry out addition with same phase.Therefore, become the simple addition of signal S2A ' behind the signal S2A and bifurcated behind the bifurcated, become the unwanted signal S2 that receives from output signal (unwanted signal) S2Aout of lead-out terminal 20.Here, because output signal S2Aout is with respect to the unwanted signal S2 phase deviation λ that receives by antenna 10A
S2After signal, therefore identical with this unwanted signal S2 phase place (S2Aout=S2A+S2A '=+ S2).
On the other hand, shown in Fig. 3 (B), the unwanted signal S2 that receives by antenna 10B sends the tie point 204 of branch line hybrid circuit 11 to.Unwanted signal S2 produces bifurcated at tie point 204, and signal S2B sends transmission lines pattern 114 to behind the bifurcated, and signal S2B ' sends transmission lines pattern 111 to behind the bifurcated.
By transmission lines pattern 114, signal S2B is offset λ in the phase place of tie point 203 with respect to tie point 204 behind the bifurcated
S2/ 2.
By transmission lines pattern 111, signal S2B ' is offset λ in the phase place of tie point 201 with respect to tie point 204 behind the bifurcated
S2/ 2.And by transmission lines pattern 112, signal S2B ' further is offset λ in the phase place of tie point 202 with respect to tie point 201 behind the bifurcated
S2/ 2.In addition, by transmission lines pattern 113, signal S2B ' further is offset λ in the phase place of tie point 203 with respect to tie point 202 behind the bifurcated
S2/ 2.That is, signal S2B ' is offset 3 λ in the phase place of tie point 203 with respect to tie point 204 behind the bifurcated
S2/ 2.
Behind the bifurcated that sends like this behind signal S2B and the bifurcated signal S2B ' send lead-out terminal 20 in tie point 203 additions.Here, as mentioned above, signal S2B is offset λ in the phase place of tie point 203 with respect to tie point 201 behind the bifurcated
S2/ 2, signal S2B ' is offset 3 λ in the phase place of tie point 203 with respect to tie point 201 behind the bifurcated
S2/ 2.That is, behind the bifurcated behind signal S1B and the bifurcated signal S1B ' carry out addition with same phase.Therefore, become the simple addition of signal S2B ' behind the signal S2B and bifurcated behind the bifurcated, become S2 from the output signal S2Bout of lead-out terminal 20.Yet, because output signal S2Bout is with respect to unwanted signal S2 phase deviation λ
S2Signal after/2, opposite with unwanted signal S2 phase place (S2Bout=S2B+S2B '=-S2).
Thereby output signal S2Aout becomes the opposite relation of phase place with output signal S2Bout, cancels out each other.Thus, can be based on the signal of unwanted signal S2 from lead-out terminal 20 outputs.
As mentioned above, by utilizing the structure of present embodiment, thereby export target signal S1 only can suppress and eliminate unwanted signal S2.At this moment, the wireless signal receiving system only forms by transmission lines, need not to comprise that filter element, filter circuit etc. are used to eliminate the individual component of unwanted signal, independent circuit.Thus, can form the wireless signal receiving system by simple structure.
Thereby, even under the consistent situation of the frequency of the transmission signal in the twice wave frequency of television broadcasting signal as described above and signal of communication, also only transmit television broadcasting signal, can suppress and eliminate the transmission signal of the signal of communication that the antenna used by television broadcasting signal receives.
In addition, though the frequency of the received signal in signal of communication is under the situation of twice wave frequency of television broadcasting signal, also be suitable for said structure, can obtain above-mentioned action effect, but if for the high transmission signal of level ratio received signal, then above-mentioned action effect is more effective.
In addition, in the above description,, be not limited to rectilinear form, make line length become the wavelength X of echo signal as long as form though show the example that transmission lines pattern 111,112,113,114 is formed rectilinear form shown in Figure 1
S11/4 length, also can be other shape.
In addition, in the above description, though the relative dielectric constant of dielectric base plate and the occurrence of relative permeability are not illustrated, high more by making this relative dielectric constant and relative permeability, the electrode length that transmission lines pattern 111,112,113,114 is formed is short more.Thus, can be with 1 miniaturization of wireless signal receiving system.
In addition, in the above description,, from above-mentioned transmission echo signal S1, suppress the viewpoint of unwanted signal S2, also can have predetermined band width though be that prerequisite describes with the single-frequency.That is,, just can obtain above-mentioned effect so long as make the amount of phase shift based on transmission lines pattern 111,112,113,114 length become the such frequency band of about 1/4 wavelength.
Particularly, as mentioned above, because the bandwidth of UHF frequency band is about 400MHz, therefore, utilizing said structure is not all to obtain above-mentioned action effect in all bandwidth effectively.Thereby, even in the UHF frequency band, also need to narrow down to the frequency band of a certain degree, set the line length of transmission lines pattern 111,112,113,114.In this case, also limited the inhibition scope of unwanted signal S2.Yet, because each transmission lines pattern 111,112,113,114 makes phase deviation 1/4 wavelength of echo signal S1, make phase deviation 1/2 wavelength of unwanted signal S2, therefore, the amount of phase shift of the per unit electrode length of unwanted signal S2 is less.Thereby, even dwindle the frequency band of echo signal S1, in the wide frequency band of the frequency band of the unwanted signal S2 more corresponding, also can suppress unwanted signal S2 than the frequency band after dwindling with this.Thus, as long as utilize the structure of present embodiment,, also can be suppressed the effect of unwanted signal S2 at least fully even have the frequency band of a certain degree.At this moment, though echo signal S1 can just as it is not export,, therefore, can obtain above-mentioned action effect in fact because its attenuation is compared lessly with the amount of suppression of unwanted signal S2.
Then, with reference to the related wireless signal receiving system of description of drawings execution mode 2.Fig. 4 is the circuit structure diagram of the wireless signal receiving system 1C of present embodiment.
As shown in Figure 4, the wireless signal receiving system 1C of present embodiment realizes transmission lines pattern 111,112,113,114 in the wireless signal receiving system 1 shown in the execution mode 1 by lumped parameter type phase-shift circuit.That is, transmission lines pattern 111 is replaced as phase-shift circuit 211, and transmission lines pattern 112 is replaced as phase-shift circuit 212, and transmission lines pattern 113 is replaced as phase-shift circuit 213, and transmission lines pattern 114 is replaced as phase-shift circuit 214.Therefore because phase-shift circuit 211,212,213,214 has same structure, only the concrete structure of phase-shift circuit 211 is described.
One end of phase-shift circuit 211 is connected with tie point 201, and the other end is connected with tie point 204.Between tie point 201 and tie point 204, promptly between the two ends of phase-shift circuit 211, be connected in series with a plurality of (amounting to four in the present embodiment) coil L.And, between the two ends of each coil L and ground connection, be connected with capacitor C (amounting to five in the present embodiment) respectively.At this moment, the capacitance settings of the inductance of coil L and capacitor C becomes to make that the phase pushing figure of echo signal S1 at two ends of phase-shift circuit 211 is λ
S1/ 4.
Employing also can obtain the action effect identical with the wireless signal receiving system of above-mentioned execution mode 1 to the lumped parameter type branch line hybrid circuit 21 that this lumped parameter type phase-shift circuit is used.
In addition, in the present embodiment, the coil L that shows each phase-shift circuit is that four, capacitor C are five situation, but the number of these coils L, capacitor C is as long as set suitably.
Then, with reference to the related wireless signal receiving system of description of drawings execution mode 3.Fig. 5 is the circuit structure diagram of the wireless signal receiving system 1VC of present embodiment.
As shown in Figure 5, the wireless signal receiving system 1VC of present embodiment also is the structure that comprises lumped parameter type branch line hybrid circuit 31.The branch line hybrid circuit 31 of present embodiment is the circuit that the capacitor C in the lumped parameter type branch line hybrid circuit 21 shown in the execution mode 2 is replaced as varicap VC.That is, phase-shift circuit 211 is replaced as phase-shift circuit 311, and phase-shift circuit 212 is replaced as phase-shift circuit 312, and phase-shift circuit 213 is replaced as phase-shift circuit 313, and phase-shift circuit 214 is replaced as phase-shift circuit 314.In addition, the component value of the varicap VC of each phase-shift circuit 311,312,313,314 is set for: which frequency that no matter is the predetermined frequency band set as echo signal S1, can both make control voltage become cut-off state and conducting state by adjusting control voltage, thereby phase-shift circuit 311,312,313,314 can make echo signal S1 phase shift λ
S1/ 4.
In addition, the branch line hybrid circuit 31 of present embodiment comprises the control circuit 30 that varicap VC is applied control voltage.Control circuit 30 has control voltage input terminal.This control voltage input terminal son 30 is connected with the mid point of phase-shift circuit 313 by inductance L r.In addition, control voltage input terminal son 30 is connected with in the phase-shift circuit 311,312,313,314 any by inductance L r.In addition, the control voltage input terminal of control circuit 30 son 30 also is connected with ground connection by capacitor Cr with the tie point of inductance L r.If adopt this structure, then can apply control voltage to the varicap of each phase-shift circuit 31,312,313,314, and, can prevent that high frequency signals such as echo signal S1, unwanted signal S2 from flowing into to control voltage input terminal 30.
In addition, between the tie point 201 and input/output port 110A of branch line hybrid circuit 31, between tie point 202 and the input/output port 110B, between tie point 203 and the input/output port 110C, be connected with capacitor Cd respectively between tie point 204 and the input/output port 110D.Thus, can prevent to control voltage flows out to antenna 10A, 10B, lead-out terminal 20.
If adopt this structure, even be not under the situation of single-frequency but arbitrary frequency in the predetermined frequency band then, also can only transmit echo signal S1 at echo signal S1, suppressing and eliminating frequency is the unwanted signal S2 of about twice of this echo signal S1.
Thus, as mentioned above, at echo signal S1 is that (470MHz～television broadcasting signal 860MHz), unwanted signal S2 are under the situation of the signal of communication (DCS850, DCS900, DCS1800, DCS1900 signal of communication etc.) that is used of the frequency band to about twice of UHF frequency band to the UHF frequency band, no matter be which interior echo signal S1 of frequency band, can both tackle by a wireless signal receiving system 1VC.Consequently, compare, can form small-sized with the wireless signal receiving system 1, the 1C that adopt a plurality of above-mentioned execution modes 2.
Claims (10)
1. a wireless signal receiving system is characterized in that, comprising:
Two reception antennas;
At least one lead-out terminal; And
Be configured in the received signal transfer circuit between described two reception antennas and the described lead-out terminal,
Described received signal transfer circuit has many transfer paths that echo signal that described two reception antennas are received respectively and unwanted signal transmit,
These many transfer paths are sent to described lead-out terminal with described echo signal, and described unwanted signal is sent to described lead-out terminal in the mode that becomes the opposite relation of phase place.
2. wireless signal receiving system as claimed in claim 1 is characterized in that,
Described wireless signal receiving system forms by have the branch line hybrid circuit of a plurality of ports with many transfer paths that are connected between these a plurality of ports,
Described a plurality of port comprises the output port that connects with described lead-out terminal, two antenna ports and the independent port different with described antenna port with described output port that is connected with described two reception antennas.
3. wireless signal receiving system as claimed in claim 2 is characterized in that,
Described two antenna ports are arranged in the two ends of a transfer path of described many transfer paths.
4. as each described wireless signal receiving system of claim 1 to 3, it is characterized in that,
Described unwanted signal is that frequency is the signal of the twice of echo signal.
5. as each described wireless signal receiving system of claim 2 to 4, it is characterized in that,
Connect by the transmission lines pattern between each port of described branch line hybrid circuit, this transmission lines pattern is that line length is 1/4 a electrode pattern of the wavelength of described echo signal.
6. as each described wireless signal receiving system of claim 2 to 4, it is characterized in that,
Be connected by the lumped parameter type phase-shift circuit that constitutes by coil part and capacitor element between each port of described branch line hybrid circuit.
7. as each described wireless signal receiving system of claim 2 to 4, it is characterized in that,
Be connected by the lumped parameter type phase-shift circuit that constitutes by coil part and varicap element between each port of described branch line hybrid circuit,
Described received signal transfer circuit also comprises the control circuit that described varicap element is applied control voltage.
8. as claim 6 or 7 described wireless signal receiving systems, it is characterized in that,
Described lumped parameter type phase-shift circuit is the circuit structure of 1/4 line length that is equivalent to the wavelength of described echo signal.
9. a communications component is characterized in that,
Comprise each described structure with claim 1 to 8 and the wireless signal receiving system that the television broadcasting signal of UHF frequency band is received as described echo signal, and,
Comprise that with frequency be the signal of communication receiving and transmitting part that the signal of twice of the frequency of television broadcasting signal is received and dispatched as the signal of communication that can become described unwanted signal.
10. communications component as claimed in claim 9 is characterized in that,
Described frequency is that the signal of twice of the frequency of television broadcasting signal is the transmission signal of described signal of communication.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2009244454A JP2011091682A (en) | 2009-10-23 | 2009-10-23 | Radio signal receiver |
| JP2009-244454 | 2009-10-23 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN102045075A true CN102045075A (en) | 2011-05-04 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2010105178394A Pending CN102045075A (en) | 2009-10-23 | 2010-10-14 | Wireless signal receiver |
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| JP (1) | JP2011091682A (en) |
| CN (1) | CN102045075A (en) |
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| CN103701479A (en) * | 2013-12-16 | 2014-04-02 | 联想(北京)有限公司 | Method of information processing and base station |
| CN108418592A (en) * | 2018-01-30 | 2018-08-17 | 广东欧珀移动通信有限公司 | Control the method and relevant device of radiation dispersion |
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Also Published As
| Publication number | Publication date |
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| JP2011091682A (en) | 2011-05-06 |
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