WO2012057078A1 - 無線通信装置、無線通信装置の制御方法、プログラム及び記憶媒体 - Google Patents
無線通信装置、無線通信装置の制御方法、プログラム及び記憶媒体 Download PDFInfo
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- WO2012057078A1 WO2012057078A1 PCT/JP2011/074433 JP2011074433W WO2012057078A1 WO 2012057078 A1 WO2012057078 A1 WO 2012057078A1 JP 2011074433 W JP2011074433 W JP 2011074433W WO 2012057078 A1 WO2012057078 A1 WO 2012057078A1
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B1/00—Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised by the medium used for transmission
- H04B1/38—Transceivers, i.e. devices in which transmitter and receiver form a structural unit and in which at least one part is used for functions of transmitting and receiving
- H04B1/40—Circuits
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- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03H—IMPEDANCE NETWORKS, e.g. RESONANT CIRCUITS; RESONATORS
- H03H7/00—Multiple-port networks comprising only passive electrical elements as network components
- H03H7/38—Impedance-matching networks
- H03H7/40—Automatic matching of load impedance to source impedance
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B1/00—Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised by the medium used for transmission
- H04B1/06—Receivers
- H04B1/16—Circuits
- H04B1/18—Input circuits, e.g. for coupling to an antenna or a transmission line
Definitions
- the present invention relates to a wireless communication technique, and more particularly to a wireless communication apparatus in which reactance of a matching circuit is variable.
- mobile wireless terminals such as mobile phone terminals have been widely used.
- the antenna built in the mobile phone terminal is located in a free space away from the human body or is located in a bag.
- the antenna is located near the user's head.
- the antenna is often located near the palm.
- the antenna may be located near the charging stand.
- the antenna position varies depending on the use situation, and the load on the antenna fluctuates due to the influence of the user's head, the user's hand, the charging stand, and the like, thereby deteriorating wireless transmission and reception characteristics. There is.
- Patent Document 1 describes a method of adjusting a load value of a matching circuit using a portable wireless device as shown in FIG.
- the mobile wireless device 1 illustrated in FIG. 9 includes a matching circuit 102, a control unit 105, and a storage unit 106.
- the control unit 105 When the control unit 105 starts to control the matching circuit 102, the control unit 105 evaluates the initial load value information stored in the storage unit 106 based on the signal strength in the frequency band of the received signal detected by the signal strength detection unit 103. If there is initial load value information that provides impedance matching, the matching circuit 102 is controlled to have a load value corresponding to the initial load value information. In addition, when there is no initial load value information for obtaining impedance matching, the control unit 105 evolves the initial load value information using a genetic algorithm, and derives and derives matched load value information for obtaining impedance matching. Matching load value information The matching circuit 102 is controlled to have a corresponding load value.
- Patent Document 2 As a technique for adjusting the load value of the matching circuit, for example, a technique described in Patent Document 2 is known.
- the control unit 105 evaluates all the initial load value information stored in the storage unit 106 and confirms whether there is initial load value information that can achieve impedance matching. At this time, it is conceivable that the initial load value information stored in the storage unit 106 includes misregistered initial load value information that deteriorates the transmission and reception characteristics.
- FIG. 10 shows an example of the relationship between the resonance frequency f0 of the antenna, the frequency Tx of the transmission signal, and the frequency Rx of the reception signal.
- the vertical axis represents signal intensity
- the horizontal axis represents frequency.
- the resonance frequency f0 of the antenna is usually adjusted to a band used for communication. As shown in FIG. 10, the closer the Tx and Rx are to the resonance frequency f0, the higher the transmission and reception characteristics.
- the resonance frequency f0 when the resonance frequency f0 is on the left side of the intermediate value between Tx and Rx, that is, when the resonance frequency f0 is shifted to the low frequency side, the transmission and reception characteristics are changed. In order to improve, it is necessary to adjust the resonance frequency f0 to the high frequency side.
- the initial load value information for shifting the resonance frequency f0 to the low frequency side and the initial load value information for shifting the resonance frequency f0 to the high frequency side are stored in the storage unit 106.
- the technique of Patent Document 1 evaluates the initial load value information for shifting the resonance frequency f0 to the low frequency side in order to evaluate all the initial load value information.
- the resonance frequency f0 further shifts to the low frequency side, the transmission and reception characteristics further deteriorate, and in the worst case, the call connection is disconnected.
- the misregistered initial load value information is also displayed. Will be evaluated. While evaluating such initial load value information, the transmission and reception characteristics (transmission / reception performance) of the portable wireless device 1 are significantly deteriorated, and the portable wireless device 1 has a problem that the call connection is disconnected.
- An object of the present invention is to realize a wireless communication apparatus capable of maintaining a good communication state in view of the above problems.
- the control unit 105 selects initial load value information from which impedance matching is obtained from the initial load value information stored in the storage unit 106, and after controlling the matching circuit 102, The matching circuit 102 is controlled to obtain impedance matching. At this time, when obtaining the impedance matching on the reception side, the control unit 105 controls the matching circuit 102 depending on whether or not the reception power is appropriate. When obtaining the impedance matching on the transmission side, the reflected voltage of the transmission signal is smaller. Thus, the matching circuit 102 is controlled.
- the reflected voltage when the transmission / reception performance is high is not necessarily the smallest.
- An example of the relationship between the intensity of the reflected wave and the ratio of the intensity of the reflected wave to the traveling wave to the antenna (reflected wave / traveling wave) is shown.
- the transmission level can be represented by the sum of the reflected wave level, the intensity of the signal radiated from the antenna (radiation from the antenna), and the intensity of the lost signal.
- the case where the lost signal is 0 will be described as an example.
- the control unit 105 Since the control unit 105 controls the matching circuit 102 so that the reflected voltage becomes small, in the case of FIG. 11A, the control unit 105 selects the state (4) having the lowest reflection level, and the matching circuit 102 To control. At this time, the radiation efficiency of the antenna is 40%, which is the best state among (1) to (4). That is, the state (4) has the highest transmission / reception performance.
- FIG. 11B shows an example of the relationship between the change in the reflection level and the reflected / traveling wave when the transmission level varies from 10.
- (3) When the transmission level is increased to 30 and the reflected wave level becomes 21 of 70% due to the matching change, the signal radiated from the antenna increases to 30% of the transmission signal.
- the control unit 105 selects the state (1) having the lowest reflection level and controls the matching circuit 102. At this time, the radiation efficiency of the antenna is 10%, which is the worst state among (1) to (4). That is, the control unit 105 selects the state with the lowest transmission / reception performance and controls the matching circuit 102.
- the signal strength (reception level) of the received signal always fluctuates due to fading. Further, when the mobile radio apparatus receives a request for increasing the transmission level (transmission level up request) from the base station, the mobile radio apparatus cannot hold the request. Therefore, in such a case, the transmission level varies.
- a wireless communication device is connected to an antenna, a wireless control unit for processing a signal transmitted and received by the antenna, and is connected between the antenna and the wireless control unit.
- a matching unit having an appropriate reactance, a signal strength detecting unit for detecting the strength of a signal flowing between the antenna and the radio control unit, an adjusting unit for changing the reactance of the matching unit, and a change in the reactance
- Determination means for determining whether the resonance frequency of the antenna is present in a high frequency range or a low frequency range of the operating frequency of the antenna from the change in strength detected by the signal strength detection means, and the adjustment
- the means adjusts the reactance so that the resonance frequency approaches the operating frequency based on the determination result of the determination means.
- the resonance frequency of the antenna can be adjusted by adjusting the reactance.
- the resonance frequency can be increased by changing the reactance of the matching unit in the negative direction (decreasing the inductance or decreasing the capacitance).
- the resonance frequency can be lowered by changing the reactance of the matching section in the positive direction (increasing the inductance or increasing the capacitance).
- the adjusting unit changes the reactance of the matching unit, and the determining unit determines the level of the resonance frequency and the operating frequency of the antenna from the change in the signal intensity accompanying the change. For example, when the adjusting means changes the reactance of the matching unit, if the intensity of the signal to be transmitted or received becomes strong, the determining means can determine that the resonance frequency of the antenna is close to the operating frequency, and transmit or receive. If the strength of the signal to be weakened, it can be determined that the resonant frequency of the antenna has moved away from the operating frequency.
- the resonance frequency of the antenna is lower than the operating frequency. It can be determined that it exists on the side.
- the reactance of the matching unit is changed in the negative direction, if it is determined that the resonance frequency of the antenna has moved away from the operating frequency, it is determined that the resonance frequency of the antenna exists on the high frequency side of the operating frequency. Can do.
- the reactance of the matching unit is changed in the positive direction and the resonance frequency of the antenna is lowered, if it is determined that the resonance frequency of the antenna is close to the operating frequency, the resonance frequency of the antenna is higher than the operating frequency.
- the adjusting means adjusts the reactance of the matching unit so that the resonant frequency of the antenna approaches the operating frequency according to the determination result of the determining means, thereby successfully bringing the resonant frequency of the antenna close to the operating frequency.
- the characteristics can be improved. For example, when it is determined that the resonant frequency of the antenna is on the high frequency side of the operating frequency, the reactance of the matching unit may be changed in the positive direction to lower the resonant frequency of the antenna. When it is determined that the resonance frequency exists on the low frequency side of the operating frequency, the reactance of the matching unit may be changed in the negative direction to increase the resonance frequency of the antenna.
- the resonance frequency in order to improve the antenna characteristics, it is possible to adjust the resonance frequency after determining whether the resonance frequency should be increased or decreased. Therefore, unlike the case where the resonance frequency is adjusted without such an index, a good communication state can be maintained without temporarily disconnecting the call connection due to significant deterioration of the antenna characteristics.
- a method for controlling a wireless communication apparatus includes an antenna, a wireless control unit for processing a signal transmitted and received by the antenna, and between the antenna and the wireless control unit. And a matching unit having a variable reactance, and a method for controlling a wireless communication device comprising: a signal strength detection step for detecting a strength of a signal flowing between the antenna and the wireless control unit; From the first adjustment step for changing the reactance of the matching unit and the change in the strength detected by the signal strength detection step accompanying the change in the reactance, the resonance frequency of the antenna becomes a high frequency of the operating frequency of the antenna and A determination step for determining in which of the low frequencies is present, and the resonance frequency is determined based on the determination result of the determination step. It is characterized in that it comprises a second adjustment step of adjusting the reactance so as to approach the number, the.
- the resonance frequency after determining whether the resonance frequency should be increased or decreased in order to improve the characteristics of the antenna. Unlike the case where the resonance frequency is adjusted without any index, the antenna characteristics are temporarily significantly deteriorated and the call connection is not disconnected, and a good communication state can be maintained.
- FIG. 2 is a flowchart showing a flow of adjusting a resonance frequency in the wireless communication apparatus of FIG. 1.
- FIG. 2 is a flowchart showing details of a resonance frequency adjustment flow when the state of the wireless communication apparatus of FIG. 1 is detected.
- FIG. When the resonance frequency at the start of the matching switching process deviates from the resonance frequency in the free space, the transmission signal to the antenna in the frequency band of the transmission signal when the matching control means changes the reactance of the variable element.
- FIG. 4B shows the change in the reflection level and the ratio of the intensity of the reflected wave to the traveling wave of the transmission signal to the antenna.
- FIG. 5B shows the change in the reflection level and the transmission signal to the antenna when the transmission level fluctuates. The ratio of the intensity of the reflected wave to the traveling wave is shown.
- FIG. 1 is a block diagram showing an internal configuration of the wireless communication device 10.
- the wireless communication device 10 includes an antenna 11, a wireless control unit 12, a state detection unit (state detection unit) 13, a signal strength detection unit (signal strength detection unit) 14, a control unit 15, a storage unit 16, And the matching part 17 is provided.
- the control unit 15 includes a calculation unit (determination unit) 151 and a matching control unit (determination unit and adjustment unit) 152. Further, the matching unit 17 includes a matching circuit (first matching circuit) 171 and a variable capacitor (variable element) 172.
- the wireless control unit 12 processes a signal transmitted and received by the antenna 11. Specifically, the radio control unit 12 down-converts, demodulates, and performs DA (Digital-Analog) conversion on the received signal. Further, the radio control unit 12 performs AD (Analog-Digital) conversion, modulation, and up-conversion on the transmission signal.
- DA Digital-Analog
- AD Analog-Digital
- the radio control unit 12 is realized by, for example, an RF IC (Radio Frequency Integrated Circuit).
- the state detection unit 13 detects a change in the state of the wireless communication device 10.
- the state detection unit 13 includes, for example, a charging stand sensor that detects that charging has started, a proximity sensor that detects the proximity of an external object such as a user's face, a telescopic sensor of a slide-type wireless communication device, and a clamshell type This is realized by an open / close sensor of a wireless communication device.
- the state detection unit 13 notifies the control unit 15 of a change in the detected state.
- the state detection unit 13 is not limited to this, for example, a button input sensor that detects pressing of a call button for receiving an instruction to start a voice call, and that a user has transmitted and / or received data. It may be a data communication sensor to be detected.
- the state detection unit 13 may detect a change in the state of the wireless communication device 10 based on the change in the signal strength detected by the signal strength detection unit 14.
- the signal strength detection unit 14 detects the strength of the signal flowing between the antenna 11 and the wireless control unit 12. Specifically, the signal strength (transmission) of the transmission signal is detected by detecting the traveling wave of the transmission signal transmitted via the antenna 11 and the intensity (level) of the reflected wave of the transmission signal reflected from the antenna 11. Level). The signal intensity detection unit supplies the detected traveling wave and reflected wave to the control unit 15.
- the signal intensity detection unit 14 is realized by, for example, a coupler and a detection IC.
- the control unit 15 comprehensively controls various configurations in the wireless communication device 10.
- the control unit 15 includes a calculation unit 151 and a matching control unit 152.
- the calculating unit 151 calculates the ratio of the intensity of the reflected wave to the traveling wave to the antenna (reflected wave / traveling wave) using the traveling wave and the reflected wave detected by the signal intensity detection unit 14.
- the calculation unit 151 stores the calculated reflected wave / traveling wave in the storage unit 16.
- the matching control unit 152 controls the matching unit 17. Specifically, the matching control unit 152 changes the reactance of the matching unit 17, and the resonance frequency of the antenna 11 is higher than the operating frequency of the antenna 11 according to the reflected wave / traveling wave calculated by the calculation unit 151. It is determined whether it exists in the low band or the low band.
- the matching control means 152 adjusts the reactance of the matching unit 17 so that the resonance frequency approaches the operating frequency based on the determination result.
- the operating frequency is a frequency for transmitting via the antenna 11.
- control unit 15 is realized by, for example, a baseband IC.
- the storage unit 16 stores a plurality of high-frequency side matching adjustment values (first matching adjustment values) that define reactance when the matching control unit 152 adjusts the resonance frequency f0 of the antenna 11 to shift to the high frequency side.
- the storage unit 16 stores the reflected wave / traveling wave calculated by the calculation unit 151.
- storage part 16 is implement
- the matching unit 17 is connected between the antenna 11 and the wireless control unit 12 and has a variable reactance.
- the matching unit 17 switches the reactance value according to a signal from the matching control unit 152, and is connected in series with the matching circuit 171 that adjusts the resonance frequency of the antenna so as to approach the operating frequency, and the matching control unit 152.
- a variable capacitor 172 for checking the position of the resonance frequency using the reactance changed by the signal from.
- FIG. 2 is a flowchart showing a flow of adjusting the resonance frequency in the wireless communication device 10.
- the matching control unit 152 sets the matching adjustment value in free space in the matching circuit 171.
- the alignment adjustment value in the free space is set as an initial value (step S1, hereinafter simply referred to as S1).
- the state detection unit 13 detects a change in the state of the wireless communication device 10 (S3), and then the matching control unit 152 In each state, it is determined whether the resonance frequency f0 of the antenna 11 is in the high band or the low band of the operating frequency of the antenna 11, and the reactance is adjusted (matching switching) (S4).
- the change in the state of the wireless communication device 10 detected by the state detection unit 13 includes the start of charging from the charging stand (detection of charging stand connection), the start of voice call (voice call detection), and the user creating a mail. It is assumed that data communication is started and / or received after starting an application and / or a browser is started (data communication detection).
- the state change of the start of the voice call detected by the state detection unit 13 may be the proximity of the user's face to the proximity sensor, or may be a press of a call button.
- the proximity of the user's face to the proximity sensor is defined as the start of a voice call.
- the matching control unit 152 sets the resonance frequency f0 of the antenna 11 to the high frequency and low frequency of the operating frequency of the antenna 11 in the charging start state. It is determined where it exists, and matching switching is performed (transition to charging stand load value adjustment mode, S4a).
- the matching control unit 152 determines whether the resonance frequency f0 of the antenna 11 is in the high range or low range of the operating frequency of the antenna 11 in the voice call state. And matching switching is performed (transition to voice call load value adjustment mode, S4b).
- the matching control unit 152 determines whether the resonance frequency f0 of the antenna 11 is in the high frequency range or the low frequency range of the antenna 11 in the data communication status. And matching switching is performed (transition to data communication load value adjustment mode, S4c).
- the change in the state of the wireless communication device 10 detected by the state detection unit 13 is not limited to this, and may be, for example, the opening and closing of the wireless communication device 10.
- FIG. 3 is a flowchart showing a detailed flow of the matching switching process (S4b) in the voice call load value adjustment mode.
- the calculation means 151 calculates the reflected wave / traveling wave using the matching adjustment value (initial value) in the free space set in the matching circuit 171 in S 1 by the matching control means 152 (S 31), and stores it in the storage unit 16. (S32).
- the matching control means 152 changes the reactance of the variable capacitor 172 slightly in the positive direction. That is, the capacitance Cv of the variable capacitor 172 is slightly increased (+ ⁇ C).
- the calculation unit 151 calculates the reflected wave / traveling wave based on the intensity of the traveling wave and the reflected wave detected by the signal intensity detection unit 14. Calculate (S33) and store in the storage unit 16 (S34).
- the case where the reactance of the variable capacitor 172 is changed in the positive direction that is, the case where the capacitance Cv of the variable capacitor 172 is slightly increased will be described as an example.
- the reactance of the variable capacitor 172 may be changed in the negative direction, that is, the capacitance Cv may be slightly reduced ( ⁇ C).
- the calculation unit 151 may calculate the return loss instead of the value of the reflected wave / traveling wave itself, and the matching control unit 152 uses the return loss instead of the value of the reflected wave / traveling wave itself. Also good.
- FIG. 4A shows the return loss of the transmission signal in the frequency band Tx of the transmission signal when the resonance frequency f0 is shifted to the high frequency side of the operating frequency.
- FIG. 4B shows the return loss of the transmission signal in the frequency band Tx of the transmission signal when the resonance frequency f0 is shifted to the low frequency side of the operating frequency.
- FIG. 4 (c) is a table showing the results of FIG. 4 (a) and FIG. 4 (b).
- a signal with a small return loss (a small reflected wave) can be said to be a signal with good transmission characteristics. That is, it can be said that the transmission characteristic is good when the value of the return loss (reflected wave / traveling wave) at Tx is smaller.
- FIG. 4C when the resonance frequency f0 is shifted to the high frequency side, when the variable capacitor 172 slightly increases the capacitance Cv, that is, the resonance frequency f0 is adjusted to the low frequency side. The transmission characteristics are the best. Further, when the resonance frequency f0 is shifted to the low frequency side, when the variable capacitor 172 slightly reduces the capacitance Cv, that is, when the resonance frequency f0 is adjusted to the high frequency side, the transmission characteristics are the best. .
- the capacitance Cv of the variable capacitor 172 is returned to the initial state.
- the matching control unit 152 compares the reflected wave / traveling wave calculated by the calculation unit 151 in S31 with the reflected wave / traveling wave calculated in S33 (S35).
- the matching control means 152 When the ratio of the intensity of the reflected wave to the traveling wave to the antenna 11 increases, that is, the matching control means 152, that is, the reflected wave / traveling wave calculated in S31 is smaller than the reflected wave / traveling wave calculated in S33. (" ⁇ " In S35), it is determined that the resonance frequency f0 is in the low range of the operating frequency.
- the matching control unit 152 acquires a plurality of matching adjustment values (parameters) from the high frequency side storage unit 161 of the storage unit 16.
- the matching control unit 152 switches the acquired parameter of the matching circuit 171, and the calculation unit 151 calculates the reflected wave / traveling wave for each switched parameter, and adopts the parameter that minimizes the reflected wave / traveling wave. .
- the calculated value of the reflected wave / traveling wave or the value calculated in S31 is the worst value.
- the matching control unit 152 adjusts the matching circuit 171 to a value defined by the adopted parameter (S36).
- the calculation means 151 periodically calculates the reflected wave / traveling wave (S37), and compares the calculated reflected wave / traveling wave value with the worst value (S38). If the value of the reflected wave / traveling wave is greater than the worst value (Yes in S38), the process proceeds to S31. If the value of the reflected wave / traveling wave is smaller than the worst value (No in S38), the process proceeds to S37, and again the parameter for which the reflected wave / traveling wave is the smallest is adopted.
- the matching control unit 152 acquires a plurality of matching adjustment values (parameters) from the low frequency side storage unit 162 of the storage unit 16.
- the matching control unit 152 switches the acquired parameter of the matching circuit 171, and the calculation unit 151 calculates the reflected wave / traveling wave for each switched parameter, and adopts the parameter that minimizes the reflected wave / traveling wave. .
- the calculated value of the reflected wave / traveling wave or the value calculated in S31 is the worst value.
- the matching control unit 152 adjusts the matching circuit 171 to a value defined by the adopted parameter (S39).
- the calculation means 151 periodically calculates the reflected wave / traveling wave (S40), and compares the calculated reflected wave / traveling wave value with the worst value (S41). If the value of the reflected wave / traveling wave is greater than the worst value (Yes in S41), the process proceeds to S31. When the value of the reflected wave / traveling wave is smaller than the worst value (No in S41), the process proceeds to S40, and again adopts the parameter that makes the reflected / traveling wave the smallest.
- the calculation unit 151 periodically calculates the reflected wave / traveling wave.
- S42 The value of the reflected / traveling wave calculated is compared with the value of the reflected / traveling wave in the free space calculated in S31 (S43).
- S43 the value of the reflected wave / traveling wave calculated in S42 is larger than the value of the reflected wave / traveling wave in free space (Yes in S43)
- the process proceeds to S31.
- the value of the reflected wave / traveling wave is smaller than the value of the reflected wave / traveling wave in free space (No in S43)
- the process proceeds to S42.
- the matching control unit 152 acquires a plurality of matching adjustment values (parameters) from the low frequency side storage unit 162 of the storage unit 16. In S ⁇ b> 39, the matching control unit 152 acquires a plurality of matching adjustment values (parameters) from the high frequency side storage unit 161 of the storage unit 16.
- FIG. 5 shows the change in the intensity of the reflected wave (reflected wave level) obtained by the reflected voltage of the transmission signal accompanying the control of the matching circuit 171 when the transmission level fluctuates from 10 and the transmission calculated by the calculation unit 151.
- An example of the ratio (reflection wave / traveling wave) of the intensity of the reflected wave to the traveling wave of the signal to the antenna is shown.
- the transmission level can be represented by the sum of the reflected wave level, the intensity of the signal radiated from the antenna (radiation from the antenna), and the intensity of the lost signal.
- the lost signal is 0 will be described as an example.
- the matching control unit 152 selects the state (4) in which the value of the reflected wave / traveling wave calculated by the calculation unit 151 is the smallest, and controls the matching circuit 171. At this time, the radiation efficiency of the antenna is 40%, which is the best state among (1) to (4). That is, the state (4) has the highest transmission / reception performance.
- the wireless communication device 10 has the highest transmission / reception characteristics, and can realize a wireless communication device with good antenna characteristics even in a real environment.
- variable capacitor 172 is used as the variable element.
- the present invention is not limited to this.
- a radio communication apparatus 20 using a variable inductor 272 as a variable element will be described.
- FIG. 6 is a block diagram showing an internal configuration of the wireless communication device 20.
- the wireless communication device 10 includes an antenna 11, a wireless control unit 12, a state detection unit 13, a signal strength detection unit 14, a storage unit 16, a control unit 25, and a matching unit 27.
- the control unit 25 comprehensively controls various configurations in the wireless communication device 20.
- the control unit 25 includes a calculation unit 151 and an alignment control unit (determination unit and adjustment unit) 252.
- the matching control means 252 controls the matching unit 27. Specifically, the matching control unit 252 changes the reactance of the matching unit 27, and the resonance frequency of the antenna 11 is higher than the operating frequency of the antenna 11 according to the reflected wave / traveling wave calculated by the calculation unit 151. It is determined whether it exists in the low band or the low band.
- the matching control means 252 adjusts the reactance of the matching unit 27 so that the resonance frequency approaches the operating frequency based on the determination result.
- the matching unit 27 is connected between the antenna 11 and the wireless control unit 12 and has a variable reactance.
- the matching unit 27 switches the reactance value according to a signal from the matching control unit 252 and connects the matching circuit 171 in series with the matching circuit 171 for adjusting the resonance frequency of the antenna so as to approach the operating frequency.
- a variable inductor (variable element) 272 for examining the position of the resonance frequency using the reactance changed by the signal from.
- the variable inductor 272 is configured such that when the matching control unit 252 changes the reactance in the negative direction, that is, when the inductance Lv of the variable inductor 272 is slightly decreased ( ⁇ L), and the matching control unit 252 sets the reactance to be positive. This is an element for examining the position of the resonance frequency when the direction is changed, that is, when the inductance Lv of the variable inductor 272 is slightly increased (+ ⁇ L).
- the reactance of the matching unit 27 is slightly changed to detect a change in signal intensity, as in the case of using a variable capacitor. Can do.
- the effect when the inductance Lv of the variable inductor 272 is slightly reduced ( ⁇ L) is the same as that obtained when the capacitance Cv of the variable capacitor 172 is slightly reduced ( ⁇ C) in the first embodiment.
- the effect when the inductance Lv of the variable inductor 272 is slightly increased (+ ⁇ L) is the same as that when the capacitance Cv of the variable capacitor 172 is slightly increased (+ ⁇ C) in the first embodiment. Therefore, the resonance frequency can be adjusted by the same steps as those in the first embodiment.
- the matching unit 17 including the matching circuit 171 and the variable capacitor 172 for adjusting the resonance frequency f0 according to the matching adjustment value has been described.
- the present invention is not limited to this. is not.
- a wireless communication device 10 ′ including a matching circuit (second matching circuit) 173 for further impedance matching in the matching unit 17 of FIG. 1 will be described.
- FIG. 7 is a block diagram showing an internal configuration of the wireless communication device 10 '.
- the radio communication device 10 ′ includes an antenna 11, a radio control unit 12, a state detection unit 13, a signal strength detection unit 14, a control unit 15 ′, a storage unit 16, and a matching unit 17 ′. Yes.
- the control unit 15 ′ comprehensively controls various components in the wireless communication device 10 ′.
- the control unit 15 ′ includes a calculation unit 151 and an alignment control unit (determination unit and adjustment unit) 152 ′.
- the matching control unit 152 controls the matching unit 17'. Specifically, the matching control unit 152 ′ changes the reactance of the matching unit 17 ′, and the resonance frequency of the antenna 11 is changed to the operating frequency of the antenna 11 according to the reflected wave / traveling wave calculated by the calculation unit 151. It is determined whether it exists in the high range or the low range.
- the matching control unit 152 ′ adjusts the reactance of the matching unit 17 ′ so that the resonance frequency approaches the operating frequency based on the determination result.
- the matching unit 17 ′ is connected between the antenna 11 and the radio control unit 12 and has a variable reactance.
- the matching unit 17 ′ includes a matching circuit 171, a variable capacitor 172, and a matching circuit (second matching circuit) 173.
- the matching circuit 173 is an element that is located in the immediate vicinity of the antenna 11 and performs impedance matching of the antenna.
- variable capacitor 172 is used as the variable element.
- the present invention is not limited to this.
- a radio communication apparatus 20 ′ using a variable inductor 272 as a variable element will be described.
- FIG. 8 is a block diagram showing an internal configuration of the wireless communication device 20 '.
- the radio communication device 20 ′ includes an antenna 11, a radio control unit 12, a state detection unit 13, a signal strength detection unit 14, a storage unit 16, a control unit 25 ′, and a matching unit 27 ′. Yes.
- the control unit 25 ′ comprehensively controls various configurations in the wireless communication device 20 ′.
- the control unit 25 ′ includes a calculation unit 151 and an alignment control unit (determination unit and adjustment unit) 252 ′.
- the matching control means 252 ' controls the matching unit 27'. Specifically, the matching control unit 252 ′ changes the reactance of the matching unit 27 ′, and the resonance frequency of the antenna 11 is changed to the operating frequency of the antenna 11 according to the reflected wave / traveling wave calculated by the calculation unit 151. It is determined whether it exists in the high range or the low range.
- the matching control unit 252 adjusts the reactance of the matching unit 27' so that the resonance frequency approaches the operating frequency based on the determination result.
- the matching unit 27 ′ is connected between the antenna 11 and the radio control unit 12 and has a variable reactance.
- the matching unit 27 ′ includes a matching circuit 171, a variable inductor 272, and a matching circuit 173.
- the configuration in which the matching circuit 171 and the variable capacitor 172 or the variable inductor 272 that are variable elements are separate has been described.
- the present invention is not limited to this, and the matching circuit 171 is not limited thereto.
- the variable element may be integrated.
- the blocks of the wireless communication device 10, the wireless communication device 10 ′, the wireless communication device 20, and the wireless communication device 20 ′ described above may be configured by hardware logic or using a CPU as follows. It may be realized by software.
- the wireless communication device 10, the wireless communication device 10 ′, the wireless communication device 20, and the wireless communication device 20 ′ store a CPU (central processing unit) that executes a command of a control program that realizes each function and the program.
- a ROM read only memory
- RAM random access memory
- a storage device such as a memory for storing the program and various data, and the like are provided.
- An object of the present invention is a program code of a control program (authentication program) for the wireless communication device 10, the wireless communication device 10 ′, the wireless communication device 20, and the wireless communication device 20 ′ that is software that implements the functions described above.
- An execution format program, an intermediate code program, and a source program) are recorded so as to be readable by a computer, and supplied to the wireless communication device 10, the wireless communication device 10 ′, the wireless communication device 20, and the wireless communication device 20 ′; This can also be achieved by reading and executing the program code recorded on the recording medium by the computer (or CPU or MPU).
- Examples of the recording medium include tapes such as magnetic tapes and cassette tapes, magnetic disks such as floppy (registered trademark) disks / hard disks, and disks including optical disks such as CD-ROM / MO / MD / DVD / CD-R.
- Card system such as IC card, IC card (including memory card) / optical card, or semiconductor memory system such as mask ROM / EPROM / EEPROM / flash ROM.
- the wireless communication device 10, the wireless communication device 10 ', the wireless communication device 20, and the wireless communication device 20' may be configured to be connectable to a communication network, and the program code may be supplied via the communication network.
- the communication network is not particularly limited.
- the Internet intranet, extranet, LAN, ISDN, VAN, CATV communication network, virtual private network, telephone line network, mobile communication network, satellite communication. A net or the like is available.
- the transmission medium constituting the communication network is not particularly limited.
- infrared rays such as IrDA and remote control, Bluetooth ( (Registered trademark), 802.11 wireless, HDR (high data rate), mobile phone network, satellite line, terrestrial digital network, and the like can also be used.
- the present invention can also be realized in the form of a computer data signal embedded in a carrier wave in which the program code is embodied by electronic transmission.
- the wireless communication device has an antenna, a wireless control unit for processing signals transmitted and received by the antenna, and a variable reactance connected between the antenna and the wireless control unit.
- a matching unit, a signal strength detection unit that detects the strength of a signal flowing between the antenna and the radio control unit, an adjustment unit that changes a reactance of the matching unit, and the signal strength associated with the change in the reactance Determination means for determining whether the resonance frequency of the antenna is present in a high range or a low range of the operating frequency of the antenna from the change in intensity detected by the detection unit, and the adjustment unit includes: Based on the determination result of the determination means, the reactance is adjusted so that the resonance frequency approaches the operating frequency.
- the operating frequency of the wireless communication device is a frequency for transmitting through the antenna, and the determination unit responds to a change in the ratio of the intensity of the reflected wave to the traveling wave to the antenna.
- the determination unit responds to a change in the ratio of the intensity of the reflected wave to the traveling wave to the antenna.
- the portable wireless device determines whether the characteristics of the antenna are improved or deteriorated (whether the resonance frequency of the antenna approaches or moves away from the operating frequency) based on the ratio of the intensity of the reflected wave to the traveling wave.
- the portable wireless device receives a request to increase the transmission level (transmission level up request) from the base station, the portable wireless device cannot hold the request and the transmission level fluctuates. To do. Therefore, if only the traveling wave or only the reflected wave is used as a reference, an incorrect result may be produced.
- the ratio of the intensity of the reflected wave to the traveling wave is used as a reference, even if the transmission level changes, both the traveling wave and the reflected wave change similarly. The above determination can be performed well even in an actual environment. As a result, it is possible to realize a wireless communication apparatus with good antenna characteristics even in a real environment.
- the determination unit of the wireless communication apparatus may be configured such that when the adjustment unit changes the reactance of the matching unit in a negative direction, the ratio of the intensity of the reflected wave to the traveling wave to the antenna increases.
- the resonance frequency is determined to be in the high range of the operating frequency, and when the ratio of the intensity of the reflected wave to the traveling wave to the antenna decreases, the resonance frequency is set to the low range of the operating frequency.
- the resonance frequency is the operation If it is determined that the frequency is in the low frequency range and the ratio of the intensity of the reflected wave to the traveling wave to the antenna decreases, it is preferable to determine that the resonance frequency is in the high frequency range of the operating frequency.
- the wireless communication apparatus includes a first storage unit that stores a first matching adjustment value that defines the reactance when the resonance frequency of the antenna is adjusted so as to shift to a high frequency side, and the antenna. And a second storage unit that stores a second matching adjustment value that defines the reactance when the resonance frequency is adjusted so as to be shifted to a low frequency side, and the adjustment unit is configured so that the determination unit includes the antenna.
- the reactance of the matching unit is set to a value defined by the first matching adjustment value stored in the first storage unit.
- the adjustment means determines that the resonance frequency of the antenna is in the high range of the operating frequency of the antenna
- the reactance of the matching unit is stored in the second storage unit. It is preferably adjusted to a value defined by and said the second matching adjustment value.
- the adjustment unit uses the first matching adjustment value stored in the first storage unit. By shifting the resonance frequency of the antenna to the high frequency side, the resonance frequency and the operating frequency can be brought close to each other.
- the adjustment unit uses the second matching adjustment value stored in the second storage unit to The resonance frequency can be made closer to the operating frequency by shifting the resonance frequency to the low frequency side.
- the operating frequency of the wireless communication device is a frequency for performing transmission via the antenna
- the first storage unit stores a plurality of the first matching adjustment values
- the second storage unit stores a plurality of the second matching adjustment values
- the adjusting unit determines the reactance of the matching unit as the first matching adjustment value or the second matching adjustment value.
- the value may be adjusted to a value defined by the matching adjustment value that minimizes the ratio of the intensity of the reflected wave to the traveling wave to the antenna.
- the adjustment unit when it is determined that the resonance frequency of the antenna is present on the low frequency side of the operating frequency, the adjustment unit is configured based on the plurality of first matching adjustment values stored in the first storage unit.
- the matching adjustment value that provides the best characteristics
- the resonance frequency of the antenna can be shifted to the high frequency side, and the resonance frequency and the operating frequency can be suitably approximated.
- the adjustment unit has the most characteristic from the plurality of second matching adjustment values stored in the second storage unit. By using a matching adjustment value that improves, the resonant frequency of the antenna can be shifted to the low frequency side, so that the resonant frequency and the operating frequency can be suitably approximated.
- the wireless communication apparatus further includes state detection means for detecting a change in the state of the wireless communication apparatus, and the adjustment means changes the reactance when the state detection means detects a change in the state.
- the determination means performs the determination, and the adjustment means adjusts the reactance.
- the state detection unit of the wireless communication device may detect the start of charging of the wireless communication device as a change in the state.
- the state detection unit of the wireless communication device may detect the start of a voice call by the wireless control unit as a change in the state.
- the wireless communication apparatus may include a call button for accepting a voice call start instruction, and the state detection unit may detect pressing of the call button as a change in the state.
- the wireless communication apparatus may include a proximity sensor, and the state detection unit may detect the proximity of an external object to the proximity sensor as a change in the state.
- the state detection means of the wireless communication apparatus may detect the start of data communication by the wireless control unit as a change in the state.
- the state detection unit of the wireless communication apparatus may detect the change in the state based on the change in the intensity detected by the signal intensity detection unit.
- the state detection unit can determine that the state of the wireless communication device has changed, for example, when the signal strength is significantly deteriorated. As a result, the state detection unit can successfully detect that the resonance frequency needs to be adjusted due to a change in the actual environment.
- the matching unit of the wireless communication device includes a first matching circuit that adjusts a resonance frequency of the antenna so as to approach the operating frequency, using the reactance adjusted by the adjusting unit, and the matching circuit And a variable element that changes the signal intensity using the reactance changed by the adjusting means.
- variable element of the wireless communication apparatus may be a variable capacitor or a variable inductor.
- the matching unit of the wireless communication apparatus according to the present invention may further include a second matching circuit for impedance matching between the antenna and the wireless control unit.
- the determination means determines whether to increase or decrease the resonance frequency in order to improve the characteristics of the antenna. Can be judged successfully.
- a program for operating a computer included in the wireless communication device the program for causing the computer to be executed as each of the above-described means, and a computer-readable recording medium on which the program is recorded are also disclosed in the present invention. Included in the scope.
- the present invention can be widely used for wireless communication devices.
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Abstract
Description
本発明の無線通信装置に関する実施の一形態について図1から図5に基づいて説明すれば以下のとおりである。
本実施形態における無線通信装置10の構成について、図1を参照して説明する。図1は、無線通信装置10の内部構成を示すブロック図である。
次に、無線通信装置10における共振周波数の調整の流れを図2及び図3を用いて説明する。
本発明に係る第2の実施の形態について、図6を参照して説明する。
本発明に係る第3の実施の形態について、図7を参照して説明する。
本発明に係る第4の実施の形態について、図8を参照して説明する。
また、上述した無線通信装置10、無線通信装置10’、無線通信装置20、及び無線通信装置20’の各ブロックは、ハードウェアロジックによって構成してもよいし、次のようにCPUを用いてソフトウェアによって実現してもよい。
以上のように、本発明における無線通信装置は、アンテナと、前記アンテナが送受信する信号を処理するための無線制御部と、前記アンテナと前記無線制御部との間に接続され、可変なリアクタンスを有する整合部と、前記アンテナと前記無線制御部との間を流れる信号の強度を検出する信号強度検出手段と、前記整合部のリアクタンスを変化させる調整手段と、当該リアクタンスの変化に伴う前記信号強度検出手段が検出した前記強度の変化から、前記アンテナの共振周波数が、前記アンテナの動作周波数の高域および低域の何れに存在するかを判定する判定手段と、を備え、前記調整手段は、前記判定手段の判定結果に基づいて、前記共振周波数が前記動作周波数に近づくように前記リアクタンスを調整する。
11 アンテナ
12 無線制御部
13 状態検知部(状態検知手段)
14 信号強度検出部(信号強度検出手段)
15、15’ 制御部
151 算出手段(判定手段)
152、152’ 整合制御手段(判定手段、調整手段)
16 記憶部
161 高域側記憶部(第1の記憶部)
162 低域側記憶部(第2の記憶部)
17、17’ 整合部
171 整合回路(第1の整合回路)
172 可変コンデンサ(可変素子)
173 整合回路(第2の整合回路)
20、20’ 無線通信装置
25、25’ 制御部
252、252’ 整合制御手段(判定手段、調整手段)
27、27’ 整合部
272 可変インダクタ(可変素子)
Claims (19)
- アンテナと、
前記アンテナが送受信する信号を処理するための無線制御部と、
前記アンテナと前記無線制御部との間に接続され、可変なリアクタンスを有する整合部と、
前記アンテナと前記無線制御部との間を流れる信号の強度を検出する信号強度検出手段と、
前記整合部のリアクタンスを変化させる調整手段と、
当該リアクタンスの変化に伴う、前記信号強度検出手段が検出した前記強度の変化から、前記アンテナの共振周波数が、前記アンテナの動作周波数の高域および低域の何れに存在するかを判定する判定手段と、を備え、
前記調整手段は、前記判定手段の判定結果に基づいて、前記共振周波数が前記動作周波数に近づくように前記リアクタンスを調整することを特徴とする無線通信装置。 - 前記動作周波数は、前記アンテナを介して送信を行うための周波数であり、
前記判定手段は、前記アンテナへの進行波に対する反射波の強度の比の変化に応じて、前記アンテナの共振周波数が、前記アンテナの動作周波数の高域および低域の何れに存在するかを判定することを特徴とする請求項1に記載の無線通信装置。 - 前記判定手段は、
前記調整手段が前記整合部のリアクタンスを負の方向に変化させたとき、
前記アンテナへの進行波に対する反射波の強度の比が増加した場合には、前記共振周波数は前記動作周波数の高域にあると判定し、
前記アンテナへの進行波に対する反射波の強度の比が減少した場合には、前記共振周波数は前記動作周波数の低域にあると判定し、
前記調整手段が前記整合部のリアクタンスを正の方向に変化させたとき、
前記アンテナへの進行波に対する反射波の強度の比が増加した場合には、前記共振周波数は前記動作周波数の低域にあると判定し、
前記アンテナへの進行波に対する反射波の強度の比が減少した場合には、前記共振周波数は前記動作周波数の高域にあると判定することを特徴とする請求項2に記載の無線通信装置。 - 前記アンテナの共振周波数が高域側にずれるように調整するときの前記リアクタンスを規定する第1の整合調整値を記憶する第1の記憶部と、
前記アンテナの共振周波数が低域側にずれるように調整するときの前記リアクタンスを規定する第2の整合調整値を記憶する第2の記憶部と、を備え、
前記調整手段は、前記判定手段が前記アンテナの共振周波数は前記アンテナの動作周波数の低域に存在すると判定したときは、前記整合部のリアクタンスを前記第1の記憶部に記憶されている前記第1の整合調整値に規定される値に調整し、前記判定手段が前記アンテナの共振周波数は前記アンテナの動作周波数の高域に存在すると判定したときは、前記整合部のリアクタンスを前記第2の記憶部に記憶されている前記第2の整合調整値に規定される値に調整することを特徴とする請求項1から3の何れか1項に記載の無線通信装置。 - 前記動作周波数は、前記アンテナを介して送信を行うための周波数であり、
前記第1の記憶部は、複数の前記第1の整合調整値を記憶しており、
前記第2の記憶部は、複数の前記第2の整合調整値を記憶しており、
前記調整手段は、前記整合部のリアクタンスを、前記複数の第1の整合調整値または前記複数の第2の整合調整値のうち、前記アンテナへの進行波に対する反射波の強度の比が最小になる整合調整値によって規定される値に調整することを特徴とする請求項4に記載の無線通信装置。 - 前記無線通信装置の状態の変化を検知する状態検知手段を備え、
前記状態検知手段が状態の変化を検知したとき、前記調整手段は、前記リアクタンスを変化させ、前記判定手段は、前記判定を行い、前記調整手段は、前記リアクタンスの調整を行うことを特徴とする請求項1から5の何れか1項に記載の無線通信装置。 - 前記状態検知手段は、前記無線通信装置に対する充電の開始を、前記状態の変化として検知することを特徴とする請求項6に記載の無線通信装置。
- 前記状態検知手段は、前記無線制御部による音声通話の開始を、前記状態の変化として検知することを特徴とする請求項6または7に記載の無線通信装置。
- 音声通話の開始指示を受け付けるための通話ボタンを備え、
前記状態検知手段は、前記通話ボタンの押下を、前記状態の変化として検知することを特徴とする請求項6から8の何れか1項に記載の無線通信装置。 - 近接センサーを備え、
前記状態検知手段は、前記近接センサーへの外部の物体の近接を、前記状態の変化として検知することを特徴とする請求項6から9の何れか1項に記載の無線通信装置。 - 前記状態検知手段は、前記無線制御部によるデータ通信の開始を、前記状態の変化として検知することを特徴とする請求項6から10の何れか1項に記載の無線通信装置。
- 前記状態検知手段は、前記信号強度検出手段が検出した前記強度の変化に基づいて、前記状態の変化を検知することを特徴とする請求項6から11の何れか1項に記載の無線通信装置。
- 前記整合部は、
前記調整手段が調整したリアクタンスを用いて、前記動作周波数に近づくように前記アンテナの共振周波数を調整する第1の整合回路と、
前記整合回路と直列に接続し、前記調整手段が変化させたリアクタンスを用いて信号強度を変化させる可変素子とを備えていることを特徴とする請求項1から12の何れか1項に記載の無線通信装置。 - 前記可変素子は、可変コンデンサであることを特徴とする請求項13に記載の無線通信装置。
- 前記可変素子は、可変インダクタであることを特徴とする請求項13に記載の無線通信装置。
- 前記整合部は、前記アンテナと前記無線制御部とをインピーダンス整合させるための第2の整合回路を更に備えていることを特徴とする請求項1から15の何れか1項に記載の無線通信装置。
- アンテナと、前記アンテナが送受信する信号を処理するための無線制御部と、前記アンテナと前記無線制御部との間に接続され、可変なリアクタンスを有する整合部とを備えた無線通信装置の制御方法であって、
前記アンテナと前記無線制御部との間を流れる信号の強度を検出する信号強度検出ステップと、
前記整合部のリアクタンスを変化させる第1の調整ステップと、
当該リアクタンスの変化に伴う前記信号強度検出ステップが検出した前記強度の変化から、前記アンテナの共振周波数が、前記アンテナの動作周波数の高域および低域の何れに存在するかを判定する判定ステップと、
前記判定ステップの判定結果に基づいて、前記共振周波数が前記動作周波数に近づくように前記リアクタンスを調整する第2の調整ステップと、を備えていることを特徴とする無線通信装置の制御方法。 - 請求項1から16の何れか1項に記載の無線通信装置を動作させるための制御プログラムであって、コンピュータを上記各手段として機能させるための制御プログラム。
- 請求項18に記載の制御プログラムを記録したコンピュータ読み取り可能な記録媒体。
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JP2018522455A (ja) * | 2015-05-18 | 2018-08-09 | キャベンディッシュ・キネティックス・インコーポレイテッドCavendish Kinetics, Inc. | 定在波共振を保持する方法及び装置、環境変化の存在におけるインピーダンス整合、並びに可変リアクタンスアンテナ開口同調を用いた頭部/手効果 |
Also Published As
Publication number | Publication date |
---|---|
JP5399567B2 (ja) | 2014-01-29 |
US20130225098A1 (en) | 2013-08-29 |
US9014645B2 (en) | 2015-04-21 |
JPWO2012057078A1 (ja) | 2014-05-12 |
CN103155423A (zh) | 2013-06-12 |
CN103155423B (zh) | 2014-11-12 |
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