WO2007135821A1 - 整合器およびアンテナ整合回路 - Google Patents
整合器およびアンテナ整合回路 Download PDFInfo
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- WO2007135821A1 WO2007135821A1 PCT/JP2007/058265 JP2007058265W WO2007135821A1 WO 2007135821 A1 WO2007135821 A1 WO 2007135821A1 JP 2007058265 W JP2007058265 W JP 2007058265W WO 2007135821 A1 WO2007135821 A1 WO 2007135821A1
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- Prior art keywords
- voltage
- variable capacitance
- capacitance diode
- control
- signal line
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Classifications
-
- 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
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01Q—ANTENNAS, i.e. RADIO AERIALS
- H01Q23/00—Antennas with active circuits or circuit elements integrated within them or attached to them
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01Q—ANTENNAS, i.e. RADIO AERIALS
- H01Q9/00—Electrically-short antennas having dimensions not more than twice the operating wavelength and consisting of conductive active radiating elements
- H01Q9/04—Resonant antennas
- H01Q9/30—Resonant antennas with feed to end of elongated active element, e.g. unipole
-
- 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
-
- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03H—IMPEDANCE NETWORKS, e.g. RESONANT CIRCUITS; RESONATORS
- H03H2250/00—Indexing scheme relating to dual- or multi-band filters
Definitions
- the present invention relates to a matching device for matching circuit impedance using a variable capacitance diode and an antenna matching circuit using the same, and in particular to shifting the change range of the applied voltage to the variable capacitance diode to reduce the variable capacitance range. It relates to expanding technology.
- reception efficiency is increased by matching impedance (impedance matching) between an antenna and a reception circuit in accordance with the reception frequency of a radio signal.
- impedance impedance matching
- a matching unit including a variable capacitance diode is disposed between the antenna and the receiving circuit.
- the tuning frequency (resonant frequency) viewed from the receiving circuit is changed.
- a variable capacitance diode is used.
- variable capacitance diode is also referred to as a noricap diode or a varactor diode, and generates a capacitance corresponding to the width of a depletion layer generated inside the variable capacitance diode.
- the variable capacitance diode is applied with a control voltage that becomes a reverse bias voltage, thereby changing the width of the depletion layer inside the variable capacitance diode, thereby making the capacitance variable.
- Patent Document 1 discloses an antenna having an inductance element and a tuning variable unit that sets a resonance frequency of the inductance element in accordance with a control voltage, and controls the antenna.
- An antenna tuning control device having control means for supplying a voltage is disclosed.
- an inductance element is connected in parallel with a fixed capacitance element and a variable capacitance element connected in series.
- Patent Document 2 adjustment processing is performed in accordance with the frequency characteristics of the antenna matching unit having a variable capacitance element and the antenna matching unit, and the constant generation unit outputs the result. And an arithmetic unit for adding to the constant and an analog converter for converting the output data of the arithmetic unit and outputting it as a control voltage for the variable capacitance element.
- a matcher is disclosed.
- Patent Document 1 Japanese Patent Laid-Open No. 10-336055
- Patent Document 2 JP-A-11-017580
- variable capacitance range of the variable capacitance diode is the control voltage applied to both ends of the variable capacitance diode. It depends on the range of change.
- the change width of the control voltage that can be applied to both ends of the variable capacitance diode is also reduced, and the variable capacitance range is more limited.
- variable capacitance range of the variable capacitance diode is limited and the performance as the matching device is degraded.
- the present invention has been made in order to solve an enormous problem, and its purpose is
- An object of the present invention is to provide a matching device and an antenna matching circuit capable of expanding the variable capacitance range of the variable capacitance diode and enabling circuit impedance matching in a wider range.
- variable capacitance diode configured to change the circuit impedance including the external element and the force sword end of the variable capacitance diode are connected to apply the first control voltage.
- the first control signal line is connected to the anode end of the variable capacitance diode, and is inserted into the second control signal line for applying the second control voltage and the second control signal line, and is variable.
- a voltage shift unit that shifts the second control voltage so that the anode potential of the capacitor diode becomes a negative potential.
- a potential difference between the control voltage applied to the force sword end and the control voltage applied to the anode end is generated as the applied voltage.
- the voltage shift unit is a chemical battery.
- a first rectifier circuit connected to the first control signal line and rectifying the first AC signal applied to the first control signal line to generate a first control voltage; and a second And a second rectifier circuit connected to the control signal line and rectifying a second AC signal applied to the second control signal line to generate a second control voltage.
- the voltage shift unit includes a constant voltage diode that generates a constant voltage by applying a reverse bias voltage, and the constant voltage diode is reverse biased using the first AC signal or the second AC signal. A voltage is applied.
- the voltage shift unit is a transformer configured to invert the polarity of the second AC signal and then apply the inverted signal to the second rectifier circuit.
- the first and second AC signals are generated by pulse width modulation.
- the matching device according to the present invention described above, and a voltage supply unit connected to the first and second control signal lines in the matching device and supplying a voltage applied to the variable capacitance diode
- the external element is an antenna matching circuit that is an antenna element.
- FIG. 1 is a diagram showing a main part of a mobile receiver provided with a matching circuit according to a first embodiment of the present invention.
- FIG. 2 is a circuit configuration diagram of a matching unit, an antenna element, and a receiving circuit.
- FIG. 10 is a diagram for explaining a change in the variable capacitance range of the variable capacitance diode due to the shift in the direction.
- FIG. 3B is a diagram for explaining a change in the variable capacitance range of the variable capacitance diode due to the shift of the control voltage in the reverse bias voltage direction when there is a voltage shift due to the battery unit.
- FIG. 4 is a circuit configuration diagram of a matching device, an antenna element, and a receiving circuit according to the second embodiment of the present invention.
- FIG. 5 is a circuit configuration diagram of a matching device, an antenna element, and a receiving circuit according to the third embodiment of the present invention.
- the mobile receiver provided with matching device 1 according to the first embodiment of the present invention is directed to reception of terrestrial digital broadcasting for mobile devices (so-called “one-segment broadcasting”) as an example.
- matching device 1 according to the first embodiment of the present invention is connected to antenna element ANT and voltage supply unit 6 to constitute antenna matching circuit 100.
- the antenna matching circuit 100 is configured to select a powerful channel such as a channel selector (not shown!). In response to the selection command SEL, the capacitance is changed so that the circuit impedance seen from the receiving circuit 8 is matched according to the receiving frequency of the corresponding channel. Then, the antenna matching circuit 100 outputs the radio signal received by the antenna to the receiving circuit 8. The reception circuit 8 amplifies the radio signal received from the antenna matching circuit 100 and outputs it as a reception signal RF. Then, the reception circuit 8 outputs the restored reception signal RF to a mixer unit, a decoder unit, or the like (not shown).
- a channel selector not shown!
- the antenna matching circuit 100 includes a voltage supply unit 6, a matching unit 1 including a variable capacitance diode VD, and an antenna element ANT.
- the voltage supply unit 6 supplies a voltage applied to the variable capacitance diode VD to the matching unit 1 in response to the channel selection command SEL.
- the voltage supply unit 6 includes pulse signals generated from the drive voltage Vcc by pulse width modulation (hereinafter also simply referred to as “PWM modulation”).
- PWM modulation pulse width modulation
- the voltage supply unit 6 changes the average voltage of the pulse signals PWM1 and PWM2 by changing the respective duty ratios, and changes the capacitance of the variable capacitance diode VD to a value corresponding to the channel selection command SEL. .
- the matching unit 1 rectifies the pulse signals PWM1 and PWM2 supplied from the voltage supply unit 6 to generate two control voltages, and the two control voltages are the power sword end and the anode of the variable capacitance diode VD. Applied to each end. In accordance with the potential difference between the two control voltages applied in this way, the variable capacitance diode VD changes its capacitance, and the output impedance of the matching circuit including the antenna element ANT, that is, the circuit viewed from the reception circuit 8. Change the impedance dance.
- variable capacitance diode VD is also referred to as a novacap diode or a varactor diode, and generates a capacitance corresponding to the width of a depletion layer generated inside the variable capacitance diode VD.
- the variable capacitance diode is applied with a control voltage so as to have a reverse noise voltage, thereby changing the width of the depletion layer inside the variable capacitance diode to realize a variable capacitance.
- matching device 1 includes voltage supply unit 6 (FIG. 1), a connection unit that receives pulse signals PWM1, PW M2, a connection unit with antenna element ANT, and reception circuit 8 Are formed.
- the matching unit 1 includes a variable capacitance diode VD and rectifier circuits LPF1, LPF. 2, inductors LI and L2, capacitor C3, and battery unit BAT.
- variable capacitance diode VD has a control signal line LN1 and an antenna element ANT connected to its force sword end, and a control signal line LN2 and a capacitor C3 connected to its anode end.
- control signal line LN1 The other end of the control signal line LN1 is connected to the rectifier circuit LPF1, and an inductor L1 is inserted in the path. Further, on the control signal line LN1, the receiving circuit 8 is connected at an intermediate position between the force sword end of the variable capacitance diode VD and the inductor L1.
- control signal line LN2 is connected to rectifier circuit LPF2, and inductor L2 and battery unit BAT are inserted in the path.
- the rectifier circuit LPF1 rectifies the pulse signal PWM1 received by the voltage supply unit 6 (Fig. 1) to generate the control voltage VI. More specifically, the rectifier circuit LPF1 is an RC type low-pass filter (LPF), and includes a resistor R1 and a capacitor CI. The resistor R1 is inserted in series in the transmission path of the pulse signal PWM1, and the capacitor C1 is connected between the transmission path of the pulse signal PWM1 and the ground potential.
- the pulse signal PWM1 input to the rectifier circuit LPF1 has its AC component cut off by the capacitor C1, and a control voltage VI mainly having a DC component force is generated in the capacitor C1.
- the control voltage VI generated by the rectifier circuit LPF1 is applied to the force sword end of the variable capacitance diode VD via the control signal line LN1. As described above, the control voltage VI appearing across the capacitor C1 is determined according to the duty ratio of the pulse signal PWM1.
- the rectifier circuit LPF2 rectifies the pulse signal PWM2 received by the voltage supply unit 6 (Fig. 1) to generate the control voltage V2.
- Rectification circuit LPF2 is similar to the above-described rectification circuit LPF1 in which resistor R2 and capacitor C2 are arranged instead of resistor R1 and capacitor C1, and therefore detailed description thereof will not be repeated. Then, the control voltage V2 generated by the rectifier circuit LPF2 is applied to the anode terminal of the variable capacitance diode VD via the control signal line LN2.
- variable capacitance diode VD generates a capacitance by being applied with a control voltage that becomes a reverse bias voltage. In other words, only when the control voltage applied to the force sword end is larger than the control voltage applied to the anode end, the variable capacitance The diode VD functions as a capacitor.
- the battery unit BAT is a voltage shift unit that shifts the control voltage V2 in a direction in which the anode potential of the variable capacitance diode VD becomes a negative potential, and superimposes its own battery voltage Vb on the control voltage V2. That is, the battery unit BAT is inserted in the direction of decreasing the control voltage V2, and acts so that a voltage corresponding to (control voltage V2 ⁇ battery voltage Vb) is applied to the anode terminal of the variable capacitance diode VD.
- the battery unit BAT consists of a chemical battery using chemical action.
- Chemical batteries include primary batteries such as dry batteries (manganese dry batteries, alkaline manganese dry batteries and nickel dry batteries), silver oxide batteries, mercury batteries, air zinc batteries and lithium batteries, or lead-acid batteries, lithium 'ion batteries, nickel' hydrogen batteries. Secondary batteries such as batteries, nickel-cadmium batteries, and nickel-zinc batteries can be used.
- primary batteries such as dry batteries (manganese dry batteries, alkaline manganese dry batteries and nickel dry batteries), silver oxide batteries, mercury batteries, air zinc batteries and lithium batteries, or lead-acid batteries, lithium 'ion batteries, nickel' hydrogen batteries.
- Secondary batteries such as batteries, nickel-cadmium batteries, and nickel-zinc batteries can be used.
- the voltage applied to the variable capacitance diode VD is (control voltage V2-control voltage VI-battery voltage Vb).
- the applied voltage is (control voltage V2—control voltage VI).
- the voltage supply unit 6 applies the variable capacitance diode VD by changing the duty ratio of the pulse signals PWM1 and PWM2 in accordance with the channel selection command SEL.
- the circuit impedance including the antenna element ANT is matched by changing the voltage.
- the radio signal received by the antenna element ANT thus impedance matched is output to the receiving circuit 8 via the control signal line LN1.
- the received radio signal is prevented from propagating to the voltage supply unit 6 side by the inductors LI and L2 inserted in the control signal lines LN1 and LN2, respectively, and thus is efficiently output to the receiving circuit 8.
- the receiving circuit 8 includes a capacitor C4 and a low noise amplifier LNA (Low Noise Amplifier).
- LNA Low Noise Amplifier
- Capacitor C4 is inserted in series between matcher 1 and low-noise amplifier LNA, and after removing the DC component (offset component) contained in the radio signal output from matcher 1, Output to sound amplifier LNA.
- Low noise amplifier LNA is an example of field effect transistor (FET: Field) such as GaAs.
- the radio signal amplified by the low noise amplifier LNA is output as a reception signal RF.
- FIGS. 3A and 3B are diagrams for explaining the change in the variable capacitance range of the variable capacitance diode VD due to the shift of the control voltage V2 in the reverse bias voltage direction.
- FIG. 3A shows a case where there is no voltage shift due to the battery unit BAT.
- Figure 3B shows the case where there is a voltage shift due to the battery part BAT.
- variable capacitance diode VD is a circuit element that functions as a capacitor only when a reverse bias voltage is applied, and generally applies a forward bias voltage. None use it. Specifically, the variable-capacitance diode VD generates the maximum capacitance under any state when any control voltage is applied. And, it has a characteristic that its capacitance gradually decreases as a voltage in the reverse noise direction is applied.
- the voltage supply unit 6 (Fig. 1) generates pulse signals PWM1 and PWM2 by PWM modulation from the drive voltage Vcc, respectively. Therefore, the control voltages VI and V2 applied to the variable capacitance diode VD are respectively It is generated by a pulse signal having an amplitude value between 0 [V] (ground potential) and the maximum voltage Vmax [V] (> 0 [V]) limited to the drive voltage Vcc [V] or less.
- variable-capacitance diode VD functions as a capacitor only when a reverse bias voltage, that is, a minus ( ⁇ ) applied voltage is applied. Therefore, Vmax [V] to Vmax [ Of the change range of V], the voltage that is substantially used as the applied voltage is limited to the range of ⁇ V max [V] to 0 [V]. That is, the duty ratio of the pulse signal PWM1 does not fall below the duty ratio of the pulse signal PWM2.
- the voltage applied to the variable-capacitance diode VD is substantially in the range of (Vmax ⁇ Vb) [V] to 0 [V], and the range is expanded by the voltage shift (battery voltage Vb). .
- the voltage applied to the variable capacitance diode VD becomes variable in a range of ⁇ 2 111 & [ ⁇ ] to 0 [ ⁇ ]. Since the change range of the applied voltage is a reverse bias voltage with respect to the variable capacitance diode VD, the entire change range can be used as the applied voltage. That is, as shown in FIG. 3A, the change range is doubled compared to the case where the applied voltage is limited to the range of Vmax [V] to 0 [V]. As the change range of the applied voltage is expanded, the variable capacitance range of the variable capacitance diode VD is also expanded as shown in FIG. 3B.
- the battery unit BAT which is a voltage shift unit, shifts the control voltage V2 in the reverse bias voltage direction, thereby substantially expanding the change range of the applied voltage to the variable capacitance diode VD. Can do. As a result, the variable capacitance range of the variable capacitance diode VD is also increased. Since it can be expanded, a matching device that can perform impedance matching over a wider range can be realized.
- the battery voltage Vb means that a “shift voltage” is given to the change range of the applied voltage, so that the change range of the applied voltage corresponding to the variable capacity range necessary for impedance matching is obtained.
- the voltage Vb can be determined. At this time, if the battery voltage Vb is smaller than the maximum voltage Vmax, a part of the change range of the applied voltage becomes the forward noise voltage, so that the use range can be limited, but the limited range is realized. It is possible to make it to the extent that there is no problem in use.
- variable-capacitance diode VD generally has an excessively large slope of the voltage-capacitance curve near 0 [V], so 0 [V] is rarely applied.
- the range including 0 [V] has been described.
- the potential difference between the control voltage applied to the force sword end and the control voltage applied to the anode end is generated as the applied voltage.
- the range included in the reverse bias voltage region of the change range of the applied voltage to the variable capacitance diode is expanded by the battery voltage.
- the change range of the applied voltage to the variable capacitance diode can be substantially expanded, so that the variable capacitance range of the variable capacitance diode can also be expanded. Therefore, a matching device and an antenna matching circuit that can perform impedance matching over a wider range can be realized.
- Embodiment 1 the case where the voltage shift unit is configured by a powerful battery unit such as a chemical battery has been described.
- a voltage shift unit is configured by a constant voltage diode that generates a constant voltage by applying a reverse bias voltage generated by an AC signal supplied from a voltage supply unit. .
- matching device 3 according to the second embodiment of the present invention includes a Zener diode in place of battery unit BAT in matching device 1 according to the first embodiment of the present invention shown in FIG. ZD (Zener Diode), resistors RIO, R20, R21, Canon CIO, Cl1, C12, C13, and diodes D10, Dl1, D12 are arranged.
- ZD Ziner Diode
- the zener diode ZD is a constant voltage diode that generates a substantially constant voltage (tuner voltage Vzd) regardless of the current when a reverse noise voltage higher than the breakdown voltage is applied.
- the Zener diode ZD is a voltage shift unit that shifts the control voltage V2 by the Zener voltage Vzd in a direction in which the anode potential of the variable capacitance diode VD becomes a negative potential. That is, the Zener diode ZD is connected so that the Zener voltage Vzd is generated in the direction of decreasing the control voltage V2, and the (control voltage V2-Zener voltage Vzd) is applied to the anode terminal of the variable capacitance diode VD.
- Capacitor C10 and resistor R10 constitute a level shift circuit for cutting off the DC component from pulse signal PWM1 and extracting only the AC component.
- the pulse signal PWM1 is a force having a pulse waveform that changes between 0 [V] and Vmax [V].
- the DC component is cut off and the capacitor C10 is connected to the resistor R10.
- the point shows an AC pulse signal that varies between -1/2 X Vmax [V] and 1 Z2 X Vmax [V].
- Diodes D10, Dl l, D12 and capacitors Cl l, C12, C13 have a voltage doubler rectification circuit that rectifies and smoothes the AC pulse signal that has passed through the Lenore shift circuit by 3 times and then rectifies and smoothes in the negative direction Constitute.
- diodes D10, Dll, and D12 are connected in series.
- Capacitor C11 is connected between the anode of diode D11 and the power sword of diode D10.
- Capacitor C12 is connected to the anode of diode D12.
- the capacitor C13 is connected between the anode of the diode D10 and the ground potential.
- the output DC negative voltage that has been rectified and smoothed after being multiplied by 3 is output to the anode terminal of the diode D12. Since the voltage doubler rectifier circuit is a technique well known to those skilled in the art, repeat the detailed circuit operation! /.
- the output DC negative voltage which is multiplied by 3 ⁇ and rectified and smoothed, appears at the anode end of the diode D12, and is divided according to the resistance ratio of the resistors R20 and R21, and the Zener diode ZD Is applied to the anode end.
- the values of the resistors R20 and R21 are appropriately set.
- Matching device 3 includes a resistor R11 connected between control signal line LN1 and the ground potential, and a resistor R12 connected between control signal line LN2 and the ground potential.
- the resistors Rl l and R12 stabilize the control voltage applied to the variable capacitance diode VD by flowing a minute current to the ground potential via the control signal lines LN1 and LN2, respectively.
- antenna element ANT and receiving circuit 8 are the same as in the first embodiment of the present invention shown in FIG. 2, and therefore detailed description will not be repeated.
- the Zener diode ZD shifts the control voltage V2. Therefore, the voltage applied to the variable capacitance diode VD is (control voltage V2-control voltage VI-Zener).
- the voltage applied to the variable capacitance diode VD shifts in the reverse bias voltage direction (minus direction) by the Zener voltage Vzd. Therefore, for the same reason as described in FIG. 3, the change range of the voltage applied to the variable capacitance diode VD can be substantially expanded.
- the variable capacitance range in the variable capacitance diode VD can be expanded, so that a matching device capable of impedance matching over a wider range can be realized.
- Embodiment 2 described above a configuration has been described in which a constant voltage is generated by applying a reverse bias voltage using pulse signal PWM1, but similarly using pulse signal PW M2 as well. Needless to say, a constant voltage can be generated.
- Zener voltage Vzd is determined by the structure or material of the Zener diode ZD, when a larger shift voltage is required, a plurality of Zener diodes ZD may be arranged in series.
- Embodiment 2 of the present invention in the variable capacitance diode, a potential difference between the control voltage applied to the force sword end and the control voltage applied to the anode end is generated as the applied voltage.
- the range included in the reverse bias voltage region of the change range of the applied voltage to the variable capacitance diode is expanded by the Zener voltage.
- the change range of the applied voltage to the variable capacitance diode can be substantially expanded. Therefore, the variable capacitance range of the variable capacitance diode can be expanded. Therefore, a matching device and an antenna matching circuit that can perform impedance matching over a wider range can be realized.
- the corner diode when an AC signal for applying a voltage to a variable capacitance diode is applied, the corner diode functions as a constant voltage diode in accordance with the AC signal. Therefore, the voltage can be automatically shifted for a necessary period. For this reason, unnecessary power consumption can be suppressed during a stop period in which the reception circuit does not receive a radio signal, so that power consumption can be reduced.
- matching device 4 according to the third embodiment of the present invention includes a transformer TR in place of battery unit BAT in matching device 1 according to the first embodiment of the present invention shown in FIG. And resistors R11 and R12 and a rectifier circuit # LPF2 instead of the rectifier circuit LPF2.
- the transformer TR is inserted between the voltage supply unit 6 (Fig. 1) and a connection unit that receives the pulse signal PWM2 and the rectifier circuit LPF2. Specifically, the pulse signal P WM2 is input to the primary winding of the transformer TR, and the output from the secondary winding is provided to the rectifier circuit # LPF2.
- the primary and secondary windings of the transformer TR are configured so that the polarities are opposite to each other, and the polarity of the pulse signal PWM2 input to the primary winding is reversed to the secondary Output from the shoreline.
- Rectifier circuit # LPF2 is the same as rectifier circuit LPF2 shown in FIG. 2, except that diode D2 is arranged in place of resistor R2, and is a negative voltage among the AC signals after polarity inversion output from transformer TR. Only the component is passed and rectified to generate a control voltage V2 consisting of a negative DC component. [0073] For this reason, when the power ratio (transformation ratio) between the primary and secondary windings of the transformer TR is 1, the control voltage V2 output from the rectifier circuit # LPF2 is — Vmax [V] It will be in the range of ⁇ 0 [V].
- Matching device 4 further includes a resistor R11 connected between control signal line LN1 and the ground potential, and a resistor R12 connected between control signal line LN2 and the ground potential.
- the resistors Rl l and R12 stabilize the control voltage applied to the variable capacitance diode VD by flowing a minute current to the ground potential via the control signal lines LN1 and LN2, respectively.
- antenna element ANT and receiving circuit 8 are the same as in the first embodiment of the present invention shown in FIG. 2, and therefore detailed description will not be repeated.
- the polarity of the control voltage V2 is inverted by the transformer TR. Therefore, the voltage applied to the variable capacitance diode VD is the inverse voltage of the absolute value of the control voltage V2. Shift in the negative voltage direction (negative direction). Therefore, for the same reason as explained in FIG. 3, the change range of the applied voltage that can be applied to the variable capacitance diode VD can be substantially expanded. As a result, the variable capacitance range in the variable capacitance diode can be expanded, so that a matching device capable of impedance matching over a wider range can be realized.
- control voltage V2 can be expanded or reduced by using a value different from 1 in the power ratio of transformer TR.
- the applied voltage to the variable capacitance diode VD can be set more freely according to the variable capacitance range of the odd VD.
- the variable capacitance diode has a potential difference between the control voltage applied to the force sword end and the control voltage applied to the anode end as the applied voltage.
- the range included in the reverse bias voltage region in the change range of the applied voltage to the variable capacitance diode is expanded.
- the change range of the applied voltage to the variable capacitance diode can be substantially expanded, so that the variable capacitance range of the variable capacitance diode can also be expanded. Therefore, it is possible to realize a matching device and an antenna matching circuit that can perform impedance matching over a wider range.
- Embodiment 3 of the present invention by changing the power ratio of the transformer, it is possible to expand or reduce the change range of the applied voltage in addition to the voltage shift. As a result, the variable capacitance range of the variable capacitance diode can be expanded.
- the force AC signal generation or modulation method exemplified for the case of using pulse signals PWM1 and PWM2 generated by PWM modulation is not limited to this.
- an AC signal can be generated using pulse frequency modulation (PFM).
- PFM pulse frequency modulation
- DAC digital-to-analog converter
- the control voltage may be generated directly.
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Abstract
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Priority Applications (2)
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JP2008516580A JPWO2007135821A1 (ja) | 2006-05-19 | 2007-04-16 | 整合器およびアンテナ整合回路 |
US12/205,149 US7812781B2 (en) | 2006-05-19 | 2008-09-05 | Matching device and antenna matching circuit |
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US12/205,149 Continuation US7812781B2 (en) | 2006-05-19 | 2008-09-05 | Matching device and antenna matching circuit |
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Cited By (2)
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JP2009239484A (ja) * | 2008-03-26 | 2009-10-15 | Fujitsu Ten Ltd | アンテナ装置、復調装置、及び受信装置 |
WO2019230027A1 (ja) * | 2018-05-31 | 2019-12-05 | 株式会社村田製作所 | インピーダンス整合素子、および通信装置 |
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US8115637B2 (en) | 2008-06-03 | 2012-02-14 | Micron Technology, Inc. | Systems and methods to selectively connect antennas to receive and backscatter radio frequency signals |
CN102118175B (zh) * | 2009-12-30 | 2015-01-28 | 中兴通讯股份有限公司 | 天线匹配电路及近距离无线通信的实现方法 |
KR101647665B1 (ko) * | 2010-08-11 | 2016-08-11 | 엘지이노텍 주식회사 | 장애물에 따른 안테나 임피던스 매칭 조정 시스템 |
CN103580712B (zh) * | 2012-08-01 | 2015-07-15 | 启碁科技股份有限公司 | 信号收发器及适应性阻抗切换电路 |
US20170018835A1 (en) * | 2015-07-17 | 2017-01-19 | Htc Corporation | Antenna control circuit and antenna control method |
JP6788562B2 (ja) * | 2017-09-19 | 2020-11-25 | 株式会社東芝 | 受信回路および無線通信装置 |
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Also Published As
Publication number | Publication date |
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CN101395808A (zh) | 2009-03-25 |
JPWO2007135821A1 (ja) | 2009-10-01 |
US20090002255A1 (en) | 2009-01-01 |
US7812781B2 (en) | 2010-10-12 |
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