WO2010016298A1 - Antenna and wireless communication machine - Google Patents
Antenna and wireless communication machine Download PDFInfo
- Publication number
- WO2010016298A1 WO2010016298A1 PCT/JP2009/056791 JP2009056791W WO2010016298A1 WO 2010016298 A1 WO2010016298 A1 WO 2010016298A1 JP 2009056791 W JP2009056791 W JP 2009056791W WO 2010016298 A1 WO2010016298 A1 WO 2010016298A1
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- antenna
- radiation electrode
- variable circuit
- frequency
- end portion
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Classifications
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01Q—ANTENNAS, i.e. RADIO AERIALS
- H01Q1/00—Details of, or arrangements associated with, antennas
- H01Q1/12—Supports; Mounting means
- H01Q1/22—Supports; Mounting means by structural association with other equipment or articles
- H01Q1/24—Supports; Mounting means by structural association with other equipment or articles with receiving set
- H01Q1/241—Supports; Mounting means by structural association with other equipment or articles with receiving set used in mobile communications, e.g. GSM
- H01Q1/242—Supports; Mounting means by structural association with other equipment or articles with receiving set used in mobile communications, e.g. GSM specially adapted for hand-held use
- H01Q1/243—Supports; Mounting means by structural association with other equipment or articles with receiving set used in mobile communications, e.g. GSM specially adapted for hand-held use with built-in antennas
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01Q—ANTENNAS, i.e. RADIO AERIALS
- H01Q5/00—Arrangements for simultaneous operation of antennas on two or more different wavebands, e.g. dual-band or multi-band arrangements
- H01Q5/30—Arrangements for providing operation on different wavebands
- H01Q5/307—Individual or coupled radiating elements, each element being fed in an unspecified way
- H01Q5/314—Individual or coupled radiating elements, each element being fed in an unspecified way using frequency dependent circuits or components, e.g. trap circuits or capacitors
- H01Q5/321—Individual or coupled radiating elements, each element being fed in an unspecified way using frequency dependent circuits or components, e.g. trap circuits or capacitors within a radiating element or between connected radiating elements
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01Q—ANTENNAS, i.e. RADIO AERIALS
- H01Q5/00—Arrangements for simultaneous operation of antennas on two or more different wavebands, e.g. dual-band or multi-band arrangements
- H01Q5/30—Arrangements for providing operation on different wavebands
- H01Q5/307—Individual or coupled radiating elements, each element being fed in an unspecified way
- H01Q5/314—Individual or coupled radiating elements, each element being fed in an unspecified way using frequency dependent circuits or components, e.g. trap circuits or capacitors
- H01Q5/328—Individual or coupled radiating elements, each element being fed in an unspecified way using frequency dependent circuits or components, e.g. trap circuits or capacitors between a radiating element and ground
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01Q—ANTENNAS, i.e. RADIO AERIALS
- H01Q5/00—Arrangements for simultaneous operation of antennas on two or more different wavebands, e.g. dual-band or multi-band arrangements
- H01Q5/30—Arrangements for providing operation on different wavebands
- H01Q5/307—Individual or coupled radiating elements, each element being fed in an unspecified way
- H01Q5/342—Individual or coupled radiating elements, each element being fed in an unspecified way for different propagation modes
- H01Q5/357—Individual or coupled radiating elements, each element being fed in an unspecified way for different propagation modes using a single feed point
- H01Q5/364—Creating multiple current paths
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- 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
- H01Q9/06—Details
- H01Q9/14—Length of element or elements adjustable
- H01Q9/145—Length of element or elements adjustable by varying the electrical length
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- 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
- H01Q9/42—Resonant antennas with feed to end of elongated active element, e.g. unipole with folded element, the folded parts being spaced apart a small fraction of the operating wavelength
Definitions
- the present invention relates to an antenna and a wireless communication device provided with a frequency variable circuit.
- Patent Document 1 Japanese Patent Document 2
- the antenna 200 disclosed in Patent Document 1 includes a radiation electrode 201, a base body 202, and a frequency variable circuit 203.
- the frequency variable circuit 203 includes a varicap diode 204, and can change the resonance frequency of the radiation electrode 201 by changing the capacitance of the varicap diode 204 with the control voltage V applied to the varicap diode 204. It can be done.
- an antenna 300 disclosed in Patent Document 2 includes a radiation electrode 301 used in a high-frequency UHF band and an additional radiation electrode 302 used in a low-frequency RF-ID band, FM band, VHF band, and the like. It has. Further, the additional radiation electrode 302 is branched from the middle of the radiation electrode 301 via the inductor 303, and the tip thereof is grounded to the ground region 305 via the reactance variable circuit 304.
- the inductor 303 is a choke coil having a high impedance with respect to a frequency equal to or higher than the frequency in the UHF band.
- the reactance variable circuit 304 is a frequency variable circuit that can control the resonance frequency of the additional antenna unit 306 including the additional radiation electrode 302.
- the conventional antenna described above has the following problems. First, since the antenna 200 disclosed in Patent Document 1 has only one radiation electrode 201, only one resonance frequency can be obtained, and multiple resonance cannot be achieved. Further, since only the capacity of one varicap diode 204 can be given to the radiation electrode 201, the variable range of the resonance frequency is narrow and it is difficult to increase the bandwidth.
- the antenna 300 disclosed in Patent Document 2 has a two-resonance configuration of a resonance frequency in the UHF band using the radiation electrode 301 and a resonance frequency such as an FM band and a VHF band using the additional radiation electrode 302. Since the additional radiation electrode 302 is connected to the radiation electrode 301 via the inductor 303 having a high impedance with respect to a frequency equal to or higher than the frequency in the UHF band, it is impossible to achieve multiple resonance in the UHF band as it is. is there. On the other hand, when the additional radiation electrode 302 is lengthened, two resonances in the UHF band can be achieved. However, when the radiation electrode 302 is lengthened, the antenna size is increased.
- the present invention has been made to solve the above-described problems, and can achieve multiple resonances in a desired band such as the UHF band without deteriorating the antenna gain while the antenna size is reduced.
- An object of the present invention is to provide an antenna and a wireless communication device capable of widening the resonance frequency.
- the invention of claim 1 includes a first antenna unit having a first frequency variable circuit capable of changing a first resonance frequency by changing a reactance value thereof;
- An antenna including a second antenna unit having a second frequency variable circuit capable of changing the second resonance frequency by changing the reactance value, wherein the first antenna unit is A first radiating electrode whose portion is connected to the power feeding portion, a first frequency variable circuit whose one end is connected to the tip of the first radiating electrode, and a base end portion of the first frequency variable circuit.
- the second frequency variable circuit and the base end portion are connected to the other end of the second frequency variable circuit, and the open end portion is close to the middle portion of the second radiation electrode and has a capacitance in the middle portion. It comprised with the couple
- the first resonance frequency can be changed by changing the reactance value using the first frequency variable circuit, and the reactance value can be changed using the second frequency variable circuit.
- the second resonance frequency can be changed. Therefore, by using this antenna, two resonances can be achieved.
- the first antenna unit is configured by the first radiation electrode, the first frequency variable circuit, and the loop-shaped second radiation electrode
- the second antenna unit is configured by the first radiation electrode and the second radiation electrode.
- the antenna length of the first antenna section and the antenna length of the second antenna section are As a result, the first resonance frequency and the second resonance frequency approach each other, and the first and second resonance frequencies can be arranged in a desired same frequency band such as the UHF band. .
- the third radiation electrode is capacitively coupled to the second radiation electrode, the inductance value of the second variable frequency circuit is not increased while the length of the third radiation electrode is shortened.
- the antenna length of the second antenna portion can be increased. As a result, it is possible to reduce insertion loss due to the lumped constant elements constituting the second frequency variable circuit, and to prevent deterioration of the antenna gain of the second antenna unit.
- n an integer greater than or equal to 3
- the base end is connected to the other end of the nth frequency variable circuit, and the open front end is the first.
- an (n + 1) th radiation electrode capacitively coupled to the middle portion of the second radiation electrode and an nth antenna portion including the second radiation electrode are added.
- the open end and the base end of the second radiation electrode are brought close to each other and capacitively coupled.
- the antenna length of the first antenna portion can be increased without increasing the inductance value of the first frequency variable circuit. Can do.
- any or all of the first antenna unit to the nth antenna unit are formed on a dielectric block.
- the first frequency variable circuit to the nth frequency variable circuit have a variable capacitance whose capacitance value can be changed by a control voltage.
- a configuration including a diode was adopted.
- a wireless communication device configured to include the antenna according to any one of claims 1 to 5.
- the antenna of the present invention there is an excellent effect that two resonances can be achieved in a desired band such as the UHF band.
- the antenna size can be reduced, and the antenna gain of the second antenna portion can be prevented from being deteriorated.
- the antenna of the third aspect of the invention it is possible to prevent the antenna gain of the first antenna unit from deteriorating.
- the capacitance value of the capacitive coupling portion can be arbitrarily changed.
- a radio communication apparatus capable of achieving two resonances in a desired band such as the UHF band, reducing the antenna size, and preventing deterioration of the antenna gain. Can be provided.
- FIG. 1 is a schematic plan view showing an antenna according to a first embodiment of the present invention. It is a schematic plan view for demonstrating the effect
- 1-1 to 1-5 antenna, A1, A2, A3 to An ... antenna, 3-1, 3-2, 3-3 to 3-n, frequency variable circuit, 4, 5, 6, 6-3 ... 6-n ... Radiation electrode, 7 ... Dielectric block, 30-32 ... Reactance circuit, 40, 50, 60 ... Base end, 41, 51, 61 ... Tip, 52 ... Middle part, 100 ... Substrate, 101 ... Non-ground area, 102 ... Ground area, 110 ... Power feeding part, A1, A2, A3-An ... Antenna part, C1-Cn ... Capacitance, D0, D1, D2 ... Variable capacitance diode, G1, G2 ... Gap, I Current, L0 to Ln: Inductor, f1: Resonance frequency, f1, f2: Resonance frequency.
- FIG. 1 is a schematic plan view showing an antenna according to a first embodiment of the present invention.
- the antenna 1-1 of this embodiment includes an antenna unit A1 as a first antenna unit and an antenna unit A2 as a second antenna unit, and is used in a wireless communication device such as a mobile phone. It is formed in the non-ground region 101 of the substrate 100 to be incorporated.
- the antenna unit A1 is an antenna unit that resonates at the resonance frequency f1 that is the first resonance frequency.
- the antenna unit A1 has a frequency variable circuit 3-1 that is a first frequency variable circuit, and changes the reactance value of the frequency variable circuit 3-1, thereby changing the resonance frequency f1 of the antenna unit A1. Be able to.
- the frequency variable circuit 3-1, the radiation electrode 4 as the first radiation electrode, and the loop-shaped radiation electrode 5 as the second radiation electrode are configured.
- the radiation electrode 4 is patterned in the non-ground region 101 with its base end 40 connected to the power feeding unit 110.
- the inductor 111 is connected to the power supply unit 110 and the base end portion 40 of the radiation electrode 4
- the inductor 112 is connected to the power supply unit 110 and the ground region 102
- a matching circuit is connected to the inductors 111 and 112. Are formed on the non-ground region 101.
- the base end part 40 of the radiation electrode 4 is in a state of being connected to the power feeding part 110 via the matching circuit.
- the frequency variable circuit 3-1 has one end connected to the distal end portion 41 of the radiation electrode 4 and the other end connected to the proximal end portion 50 of the radiation electrode 5. It is interposed between. Specifically, the frequency variable circuit 3-1 has a configuration in which a variable reactance circuit 30 connected to the distal end portion 41 of the radiation electrode 4 and a reactance circuit 31 connected to the proximal end portion 50 of the radiation electrode 5 are connected. ing. Then, by applying the tuning voltage Vc as the control voltage from the tuning voltage source 120 to the reactance circuits 30 and 31 and changing the reactance value, the resonance frequency f1 of the antenna unit A1 can be controlled. It has become.
- the radiation electrode 5 extends from the proximal end portion 50 connected to the reactance circuit 31 of the frequency variable circuit 3-1, draws a loop, and the distal end portion 51 wraps around the proximal end portion 50 side, so that the proximal end portion 50 It has a shape next to it. That is, the radiation electrode 5 has a loop shape as a whole, and the distal end portion 51 faces the proximal end portion 50 via the gap G1.
- the transmission / reception band of the antenna unit A1 having such a configuration is the UHF band, and the reactance values of the reactance circuits 30 and 31 of the frequency variable circuit 3-1 and the lengths of the radiation electrodes 4 and 5 resonate at the resonance frequency f1 of the UHF band. Is set to
- the antenna portion A2 is an antenna portion that resonates at the resonance frequency f2 that is the second resonance frequency.
- the antenna unit A2 includes a frequency variable circuit 3-2 that is a second frequency variable circuit, and changes the reactance value of the frequency variable circuit 3-2 to change the resonance frequency f2 of the antenna unit A2. Be able to.
- the antenna portion A2 is configured by the radiation electrode 4, the frequency variable circuit 3-2, the radiation electrode 6 as the third radiation electrode, and the radiation electrode 5.
- the frequency variable circuit 3-2 is connected between the radiation electrode 4 and the radiation electrode 6 with one end connected to the distal end portion 41 of the radiation electrode 4 and the other end connected to the proximal end portion 60 of the radiation electrode 6. It is interposed between.
- the frequency variable circuit 3-2 has a configuration in which a reactance circuit 30 and a reactance circuit 32 connected to the base end portion 60 of the radiation electrode 6 are connected. Then, by applying a tuning voltage Vc as a control voltage from the tuning voltage source 120 to the reactance circuits 30 and 32 and changing the reactance value, the resonance frequency f2 of the antenna unit A2 can be controlled. It has become.
- the radiation electrode 6 extends along the radiation electrode 5 from the base end portion 60 connected to the reactance circuit 32 of the frequency variable circuit 3-2, and the distal end portion 61 in the open state is close to the middle portion 52 of the radiation electrode 5. ing. Specifically, the distal end portion 61 of the radiation electrode 6 approaches the middle portion 52 of the radiation electrode 5 via the narrow gap G2, and the radiation electrode 6 is generated between the distal end portion 61 and the middle portion 52. It is capacitively coupled to the middle part 52 of the radiation electrode 5 through a constant type capacitor C2.
- the antenna part A2 is composed of the radiation electrode 4, the frequency variable circuit 3-2, the radiation electrode 6 and the radiation electrode 5, the antenna length of the antenna part A2 can be brought close to the antenna length of the antenna part A1. It can. Accordingly, the reactance values of the reactance circuits 30 and 32 of the frequency variable circuit 3-2 and the lengths of the radiation electrodes 4, 5, and 6 can be set to resonate at the resonance frequency f2 in the UHF band, and the antenna unit A2 Can be transmitted and received in the same UHF band as the antenna unit A1. In addition, since the radiation electrode 6 is capacitively coupled to the radiation electrode 5 and the loop-shaped radiation electrode 5 is included in the antenna length of the antenna part A2, the length of the radiation electrode 6 can be shortened. For this reason, the inductance value of the lumped constant element constituting the frequency variable circuit 3-2 can be kept small.
- Reference numeral 130 denotes an inductor for taking a ground potential.
- FIG. 2A and 2B are schematic plan views for explaining the operation of the antenna 1-1.
- FIG. 2A shows the operation of the antenna unit A1
- FIG. 2B shows the operation of the antenna unit A2.
- FIG. 3 is a diagram showing a change state of each resonance frequency.
- the antenna unit A1 when a current having a resonance frequency f1 is supplied from the power feeding unit 110 to the radiation electrode 4, the antenna unit A1 resonates and transmits a radio wave having the resonance frequency f1. In addition, it resonates with an external radio wave having a resonance frequency f1 and receives it. In this case, as shown in FIG.
- the current I having the resonance frequency f1 flows from the radiation electrode 4 of the antenna part A1 through the reactance circuits 30 and 31 of the frequency variable circuit 3-1, to form a loop-shaped radiation electrode. 5, the antenna unit A1 enters an excited state, and resonates at the resonance frequency f1 in the UHF band as indicated by the solid curve S1 in FIG.
- the antenna unit A2 when a current having a resonance frequency f2 is supplied from the power feeding unit 110 to the radiation electrode 4, the antenna unit A2 resonates and transmits a radio wave having the resonance frequency f2. Further, the signal is received by resonating with an external radio wave having a resonance frequency f2. In such a case, as shown in FIG.
- the current I having the resonance frequency f2 flows from the radiation electrode 4 of the antenna part A2 to the radiation electrode 6 through the reactance circuits 30 and 32 of the frequency variable circuit 3-2. . Then, the current I on the radiation electrode 6 flows to the loop-shaped radiation electrode 5 through the capacitance C2 generated by capacitive coupling between the radiation electrode 6 and the radiation electrode 5, and the antenna portion A2 enters an excited state. At this time, the current I flowing from the radiation electrode 6 into the radiation electrode 4 flows in either the direction indicated by the solid line or the direction indicated by the broken line according to the magnitude of the resonance frequency f2, and the solid line curve S2 in FIG. As shown by, resonance occurs at the resonance frequency f2 in the UHF band.
- the resonance frequencies f1 and f2 can be independently set within a wide band by the tuning voltage Vc. Can be controlled.
- FIG. 4 is a schematic plan view showing an antenna according to the second embodiment of the present invention.
- the frequency variable circuits 3-1 and 3-2 include variable capacitance diodes whose capacitance values can be changed by a control voltage. That is, the reactance circuit 30 is composed of an inductor L0 connected to the tip 41 of the radiation electrode 4 and a variable capacitance diode D0 having an anode connected to the inductor L0.
- the reactance circuit 31 is connected to the cathode side of the variable capacitance diode D0 on the cathode side, and the inductor connected between the anode side of the variable capacitance diode D1 and the base end portion 50 of the radiation electrode 5 And L1.
- the reactance circuit 32 is configured by an inductor L2 connected between the cathode side of the variable capacitance diodes D0 and D1 and the base end portion 60 of the radiation electrode 6.
- the tuning voltage source 120 was connected to the connection point P between the cathodes of the variable capacitance diodes D0 and D1 and the inductor L2 via the high frequency cut resistors 121 and 123 and the DC pass capacitor 122.
- the radiation electrode 6 is capacitively coupled to the radiation electrode 5 and the radiation electrode 5 is included in the antenna length of the antenna portion A2. Therefore, the length of the radiation electrode 6 is short. I'll do it. For this reason, the inductance value of the inductor L2 of the lumped constant element constituting the frequency variable circuit 3-2 can be suppressed small, and the antenna gain of the antenna part A2 is prevented from deteriorating while the antenna 1-2 is downsized. be able to.
- the reactance circuit 32 is configured by the inductor L2. However, for example, as shown in FIG. 5, the reactance circuit 32 is connected to the cathode side of the variable capacitance diodes D0 and D1.
- the variable capacitance diode D2 and the inductor L2 connected between the anode side of the variable capacitance diode D2 and the base end portion 60 of the radiation electrode 6 may be used. Since other configurations, operations, and effects are the same as those in the first embodiment, description thereof is omitted.
- FIG. 6 is a schematic plan view showing an antenna according to the third embodiment of the present invention.
- the antenna 1-3 of this embodiment is different from the first and second embodiments in that multiple resonance is achieved. That is, the inductor L3 is connected to the connection point P, the fourth radiating electrode 6-3 is connected to the inductor L3, and the tip thereof is brought close to the midway part 52 of the radiating electrode 5, thereby forming the capacitor C3.
- the third antenna portion A3 is configured by the radiation electrode 4, the third frequency variable circuit 3-3 including the reactance circuit 30 and the inductor L3, the radiation electrode 6-3, and the radiation electrode 5.
- the inductor Ln is connected to the connection point P
- the (n + 1) th radiating electrode 6-n is connected to the inductor Ln
- the tip thereof is brought close to the midway part 52 of the radiating electrode 5, so that the capacitance Cn Formed.
- the nth antenna portion An is configured by the radiation electrode 4, the nth frequency variable circuit 3-n including the reactance circuit 30 and the inductor Ln, the radiation electrode 6-n, and the radiation electrode 5.
- the antenna 1-3 according to this embodiment can achieve a maximum of n resonances.
- Other configurations, operations, and effects are the same as those in the first and second embodiments, and thus description thereof is omitted.
- FIG. 7 is a schematic plan view showing an antenna according to the fourth embodiment of the present invention.
- the radiation electrode 5 is capacitively coupled. Specifically, the distal end portion 51 and the proximal end portion 50 in the open state of the radiation electrode 5 are brought close to each other, the gap G1 between the distal end portion 51 and the proximal end portion 50 is reduced, and the capacitance C1 is generated. The distal end portion 51 and the proximal end portion 50 were capacitively coupled.
- FIG. 8 is a schematic perspective view showing an antenna according to a fifth embodiment of the present invention.
- the antenna portions A1 and A2 are formed on the dielectric block 7.
- the L-shaped radiation electrode 4 is formed on the front surface 71 of the dielectric block 7, and the radiation electrode 4 is connected to the power supply unit 110 through the wiring pattern 113 patterned on the non-ground region 101. did.
- a matching circuit including inductors 111 and 112 as lumped constant elements was mounted on the wiring pattern 113.
- the loop-shaped radiation electrode 5 and the linear radiation electrode 6 were formed close to the upper surface 72 of the dielectric block 7.
- a wiring pattern 124 for connecting the radiation electrode 4, the radiation electrode 5, and the radiation electrode 6 is formed across the front surface 71 and the upper surface 72 of the dielectric block 7, and is a lumped constant element that constitutes the reactance circuit 30.
- the wiring pattern 124 includes an inductor L0 and a variable capacitance diode D0, a variable capacitance diode D1 and an inductor L1 that are lumped constant elements constituting the reactance circuit 31, and an inductor L2 that is a lumped constant element constituting the reactance circuit 32.
- a wiring pattern 125 connected to the connection point P on the wiring pattern 124 is formed across the front surface 71 and the non-ground region 101, and is connected to the tuning voltage source 120 for high-frequency cut that is a lumped constant element path.
- Resistors 121 and 123 and a DC pass capacitor 122 are mounted on the wiring pattern 125.
- the wiring pattern 131 was formed from the right corner of the radiation electrode 5 to the upper surface 72, the front surface 71, and the non-ground region 101 and connected to the ground region 102.
- An inductor 130, which is a lumped element, is mounted on the wiring pattern 131.
- the dielectric constant of the dielectric block 7 by changing the dielectric constant of the dielectric block 7, the value of the capacitance C2 between the distal end portion of the radiation electrode 6 and the middle portion of the radiation electrode 5, the distal end portion, and the proximal end portion of the radiation electrode 5 can be obtained.
- the value of the capacitance C1 in between can be arbitrarily changed.
- the antenna 1-5 can be made smaller than the antennas 1-1 to 1-4.
- Other configurations, operations, and effects are the same as those in the first to fourth embodiments, and thus description thereof is omitted.
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Abstract
Description
まず、特許文献1に開示されたアンテナ200では、1つの放射電極201しか有していないので、共振周波数を1つしか得ることができず、複共振化が不可能である。また、放射電極201に1つのバリキャップダイオード204の容量しか与えることができないので、共振周波数の可変範囲が狭く、広帯域化が困難である。 However, the conventional antenna described above has the following problems.
First, since the
かかる構成により、第1のアンテナ部により、第1の共振周波数で送受信することができ、第2のアンテナ部により、第2の共振周波数で送受信することができる。このとき、第1の周波数可変回路を用いて、そのリアクタンス値を変化させることで、第1の共振周波数を変化させることができ、第2の周波数可変回路を用いて、そのリアクタンス値を変化させることで、第2の共振周波数を変化させることができる。したがって、このアンテナを用いることで、2共振化を図ることができる。
そして、第1のアンテナ部を、第1の放射電極と第1の周波数可変回路とループ状の第2の放射電極とで構成し、第2のアンテナ部を、第1の放射電極と第2の周波数可変回路と第2の放射電極に容量結合した第3の放射電極と第2の放射電極とで構成したので、これら第1のアンテナ部のアンテナ長と第2のアンテナ部のアンテナ長とを近づけることができ、この結果、第1の共振周波数と第2の共振周波数とが近づき、これら第1及び第2の共振周波数をUHF帯等、所望の同一周波数帯域内に配することができる。
しかも、第3の放射電極を第2の放射電極に容量結合した構成であるので、第3の放射電極の長さを短くした状態で、第2の周波数可変回路のインダクタンス値を大きくすることなく、第2のアンテナ部のアンテナ長を長くすることができる。この結果、第2の周波数可変回路を構成する集中定数素子による挿入ロスを減らすことができ、第2のアンテナ部のアンテナ利得の劣化を防止することができる。 In order to solve the above-mentioned problem, the invention of claim 1 includes a first antenna unit having a first frequency variable circuit capable of changing a first resonance frequency by changing a reactance value thereof; An antenna including a second antenna unit having a second frequency variable circuit capable of changing the second resonance frequency by changing the reactance value, wherein the first antenna unit is A first radiating electrode whose portion is connected to the power feeding portion, a first frequency variable circuit whose one end is connected to the tip of the first radiating electrode, and a base end portion of the first frequency variable circuit. A distal end portion in an open state that is connected to the other end of the first end portion of the base end portion and is adjacent to the second radiation electrode in the form of a loop, and the second antenna portion is a first radiation electrode; One end is connected to the tip of the first radiation electrode. The second frequency variable circuit and the base end portion are connected to the other end of the second frequency variable circuit, and the open end portion is close to the middle portion of the second radiation electrode and has a capacitance in the middle portion. It comprised with the couple | bonded 3rd radiation electrode and the said 2nd radiation electrode.
With this configuration, transmission / reception can be performed at the first resonance frequency by the first antenna unit, and transmission / reception can be performed at the second resonance frequency by the second antenna unit. At this time, the first resonance frequency can be changed by changing the reactance value using the first frequency variable circuit, and the reactance value can be changed using the second frequency variable circuit. Thus, the second resonance frequency can be changed. Therefore, by using this antenna, two resonances can be achieved.
The first antenna unit is configured by the first radiation electrode, the first frequency variable circuit, and the loop-shaped second radiation electrode, and the second antenna unit is configured by the first radiation electrode and the second radiation electrode. Since the third variable frequency circuit, the third radiation electrode capacitively coupled to the second radiation electrode, and the second radiation electrode, the antenna length of the first antenna section and the antenna length of the second antenna section are As a result, the first resonance frequency and the second resonance frequency approach each other, and the first and second resonance frequencies can be arranged in a desired same frequency band such as the UHF band. .
In addition, since the third radiation electrode is capacitively coupled to the second radiation electrode, the inductance value of the second variable frequency circuit is not increased while the length of the third radiation electrode is shortened. The antenna length of the second antenna portion can be increased. As a result, it is possible to reduce insertion loss due to the lumped constant elements constituting the second frequency variable circuit, and to prevent deterioration of the antenna gain of the second antenna unit.
かかる構成により、最大n数の多共振化を図ることができる。 According to a second aspect of the present invention, there is provided the antenna according to the first aspect, wherein the first radiation electrode and one end thereof are connected to the tip of the first radiation electrode and the reactance value thereof is changed to change the nth ( n = an integer greater than or equal to 3) and the base end is connected to the other end of the nth frequency variable circuit, and the open front end is the first. In this configuration, an (n + 1) th radiation electrode capacitively coupled to the middle portion of the second radiation electrode and an nth antenna portion including the second radiation electrode are added.
With this configuration, it is possible to achieve a maximum of n resonances.
かかる構成により、第2の放射電極の先端部と基端部とを容量結合したので、第1の周波数可変回路のインダクタンス値を大きくすることなく、第1のアンテナ部のアンテナ長を長くすることができる。この結果、第1の周波数可変回路を構成する集中定数素子による挿入ロスを減らすことができ、第1のアンテナ部のアンテナ利得の劣化を防止することができる。 According to a third aspect of the present invention, in the antenna according to the first or second aspect, the open end and the base end of the second radiation electrode are brought close to each other and capacitively coupled.
With this configuration, since the distal end portion and the proximal end portion of the second radiation electrode are capacitively coupled, the antenna length of the first antenna portion can be increased without increasing the inductance value of the first frequency variable circuit. Can do. As a result, it is possible to reduce insertion loss due to the lumped constant element constituting the first frequency variable circuit, and to prevent deterioration of the antenna gain of the first antenna unit.
かかる構成により、誘電体ブロックの誘電率を変化させることで、第3の放射電極の先端部と第2の放射電極の途中部との間の容量値や、第2の放射電極の先端部,基端部間の容量値を任意に変化させることができる。 According to a fourth aspect of the present invention, in the antenna according to any one of the first to third aspects, any or all of the first antenna unit to the nth antenna unit are formed on a dielectric block. .
With this configuration, by changing the dielectric constant of the dielectric block, the capacitance value between the tip of the third radiation electrode and the middle of the second radiation electrode, the tip of the second radiation electrode, The capacitance value between the base ends can be arbitrarily changed.
図1に示すように、この実施例のアンテナ1-1は、第1のアンテナ部としてのアンテナ部A1と第2のアンテナ部としてのアンテナ部A2とを備え、携帯電話等の無線通信機に内蔵される基板100の非グランド領域101に形成されている。 FIG. 1 is a schematic plan view showing an antenna according to a first embodiment of the present invention.
As shown in FIG. 1, the antenna 1-1 of this embodiment includes an antenna unit A1 as a first antenna unit and an antenna unit A2 as a second antenna unit, and is used in a wireless communication device such as a mobile phone. It is formed in the
具体的には、この周波数可変回路3-1と、第1の放射電極としての放射電極4と、第2の放射電極としてのループ状の放射電極5とで構成されている。 The antenna unit A1 is an antenna unit that resonates at the resonance frequency f1 that is the first resonance frequency. The antenna unit A1 has a frequency variable circuit 3-1 that is a first frequency variable circuit, and changes the reactance value of the frequency variable circuit 3-1, thereby changing the resonance frequency f1 of the antenna unit A1. Be able to.
Specifically, the frequency variable circuit 3-1, the
具体的には、周波数可変回路3-1は、放射電極4の先端部41に接続した可変のリアクタンス回路30と放射電極5の基端部50に接続したリアクタンス回路31とを接続した構成になっている。そして、同調電圧源120からの制御電圧としての同調電圧Vcをこれらのリアクタンス回路30,31に印加して、リアクタンス値を変えることにより、アンテナ部A1の共振周波数f1を制御することができるようになっている。 The frequency variable circuit 3-1 has one end connected to the
Specifically, the frequency variable circuit 3-1 has a configuration in which a
具体的には、放射電極4と周波数可変回路3-2と第3の放射電極としての放射電極6と放射電極5とで、アンテナ部A2を構成した。 On the other hand, the antenna portion A2 is an antenna portion that resonates at the resonance frequency f2 that is the second resonance frequency. The antenna unit A2 includes a frequency variable circuit 3-2 that is a second frequency variable circuit, and changes the reactance value of the frequency variable circuit 3-2 to change the resonance frequency f2 of the antenna unit A2. Be able to.
Specifically, the antenna portion A2 is configured by the
具体的には、周波数可変回路3-2は、リアクタンス回路30と放射電極6の基端部60に接続したリアクタンス回路32とを接続した構成になっている。そして、同調電圧源120からの制御電圧としての同調電圧Vcをこれらのリアクタンス回路30,32に印加して、リアクタンス値を変えることにより、アンテナ部A2の共振周波数f2を制御することができるようになっている。 The frequency variable circuit 3-2 is connected between the
Specifically, the frequency variable circuit 3-2 has a configuration in which a
したがって、周波数可変回路3-2のリアクタンス回路30,32のリアクタンス値と放射電極4,5,6の長さを、UHF帯の共振周波数f2で共振するように設定することができ、アンテナ部A2をアンテナ部A1と同じUHF帯で送受信することが可能である。
しかも、放射電極6を放射電極5に容量結合して、ループ状の放射電極5をアンテナ部A2のアンテナ長に含める構成であるので、放射電極6の長さが短くて済む。このため、周波数可変回路3-2を構成する集中定数素子のインダクタンス値を小さく抑えることができる。
なお、符号130は、グランド電位をとるためのインダクタである。 Thus, since the antenna part A2 is composed of the
Accordingly, the reactance values of the
In addition, since the
図2は、アンテナ1-1の作用を説明するための概略平面図であり、図2の(a)は、アンテナ部A1の作用を示し、図2の(b)は、アンテナ部A2の作用を示す。また、図3は、各共振周波数の変化状態を示す線図である。
図1において、共振周波数f1の電流を給電部110から放射電極4に供給すると、アンテナ部A1が共振して、共振周波数f1の電波を送信する。また、外部からの共振周波数f1の電波に共振して受信する。かかる場合には、図2の(a)に示すように、共振周波数f1の電流Iが、アンテナ部A1の放射電極4から周波数可変回路3-1のリアクタンス回路30,31を通じてループ状の放射電極5に流れて、アンテナ部A1が励振状態になり、図3の実線曲線S1で示すように、UHF帯内の共振周波数f1で共振する。
一方、図1において、共振周波数f2の電流を給電部110から放射電極4に供給すると、アンテナ部A2が共振して、共振周波数f2の電波を送信する。また、外部からの共振周波数f2の電波に共振して受信する。かかる場合には、図2の(b)に示すように、共振周波数f2の電流Iが、アンテナ部A2の放射電極4から周波数可変回路3-2のリアクタンス回路30,32を通じて放射電極6に流れる。そして、放射電極6上の電流Iは、放射電極6と放射電極5との容量結合によって生じた容量C2を通じてループ状の放射電極5に流れ、アンテナ部A2が励振状態になる。このとき、放射電極6から放射電極4に流入した電流Iは、共振周波数f2の大きさに応じて、実線で示す方向又は破線で示す方向のいずれかの方向に流れ、図3の実線曲線S2で示すように、UHF帯内の共振周波数f2で共振する。 Next, functions and effects exhibited by the antenna 1-1 of this embodiment will be described.
2A and 2B are schematic plan views for explaining the operation of the antenna 1-1. FIG. 2A shows the operation of the antenna unit A1, and FIG. 2B shows the operation of the antenna unit A2. Indicates. FIG. 3 is a diagram showing a change state of each resonance frequency.
In FIG. 1, when a current having a resonance frequency f1 is supplied from the
On the other hand, in FIG. 1, when a current having a resonance frequency f2 is supplied from the
図4は、この発明の第2実施例に係るアンテナを示す概略平面図である。
この実施例のアンテナ1-2では、周波数可変回路3-1,3-2が、その容量値を制御電圧で変化可能な可変容量ダイオードを含んでいる。
すなわち、リアクタンス回路30を、放射電極4の先端部41に接続されたインダクタL0と、このインダクタL0にアノード側を接続した可変容量ダイオードD0とで構成した。そして、リアクタンス回路31を可変容量ダイオードD0のカソード側にカソード側を接続した可変容量ダイオードD1と、この可変容量ダイオードD1のアノード側と放射電極5の基端部50との間に接続されたインダクタL1とで構成した。さらに、リアクタンス回路32を可変容量ダイオードD0,D1のカソード側と放射電極6の基端部60との間に接続されたインダクタL2で構成した。
そして、同調電圧源120を、高周波カット用抵抗121,123及びDCパスコンデンサ122を介して、これら可変容量ダイオードD0,D1のカソードとインダクタL2との接続点Pに接続した。
これにより、同調電圧源120からの同調電圧Vcを接続点Pに印加すると、可変容量ダイオードD0,D1の容量値が同調電圧Vcの大きさに対応して変化する。 Next explained is the second embodiment of the invention.
FIG. 4 is a schematic plan view showing an antenna according to the second embodiment of the present invention.
In the antenna 1-2 of this embodiment, the frequency variable circuits 3-1 and 3-2 include variable capacitance diodes whose capacitance values can be changed by a control voltage.
That is, the
The tuning
Thus, when the tuning voltage Vc from the tuning
その他の構成、作用及び効果は、上記第1実施例と同様であるので、その記載は省略する。 In this embodiment, the
Since other configurations, operations, and effects are the same as those in the first embodiment, description thereof is omitted.
図6は、この発明の第3実施例に係るアンテナを示す概略平面図である。
図6に示すように、この実施例のアンテナ1-3は、多共振化を図っている点が、上記第1及び第2実施例と異なる。
すなわち、インダクタL3を接続点Pに接続し、第4の放射電極6-3をこのインダクタL3に接続させると共にその先端部を放射電極5の途中部52に近接させて、容量C3を形成した。これにより、放射電極4と、リアクタンス回路30及びインダクタL3でなる第3の周波数可変回路3-3と、放射電極6-3と、放射電極5とで、第3のアンテナ部A3を構成した。
以下、同様にして、インダクタLnを接続点Pに接続し、第n+1の放射電極6-nをこのインダクタLnに接続させると共にその先端部を放射電極5の途中部52に近接させて、容量Cnを形成した。これにより、放射電極4と、リアクタンス回路30及びインダクタLnでなる第nの周波数可変回路3-nと、放射電極6-nと、放射電極5とで、第nのアンテナ部Anを構成した。
かかる構成により、この実施例のアンテナ1-3では、最大n数の多共振化を図ることができる。
その他の構成、作用及び効果は、上記第1及び第2実施例と同様であるので、その記載は省略する。 Next explained is the third embodiment of the invention.
FIG. 6 is a schematic plan view showing an antenna according to the third embodiment of the present invention.
As shown in FIG. 6, the antenna 1-3 of this embodiment is different from the first and second embodiments in that multiple resonance is achieved.
That is, the inductor L3 is connected to the connection point P, the fourth radiating electrode 6-3 is connected to the inductor L3, and the tip thereof is brought close to the
Similarly, the inductor Ln is connected to the connection point P, the (n + 1) th radiating electrode 6-n is connected to the inductor Ln, and the tip thereof is brought close to the
With this configuration, the antenna 1-3 according to this embodiment can achieve a maximum of n resonances.
Other configurations, operations, and effects are the same as those in the first and second embodiments, and thus description thereof is omitted.
図7は、この発明の第4実施例に係るアンテナを示す概略平面図である。
図7に示すように、この実施例のアンテナ1-4では、放射電極5を容量結合した。
具体的には、放射電極5の開放状態の先端部51と基端部50とを近接させて、これら先端部51と基端部50との間隙G1を小さくし、容量C1を発生させて、先端部51と基端部50とを容量結合した。 Next explained is the fourth embodiment of the invention.
FIG. 7 is a schematic plan view showing an antenna according to the fourth embodiment of the present invention.
As shown in FIG. 7, in the antenna 1-4 of this embodiment, the
Specifically, the
その他の構成、作用及び効果は、上記第1ないし第3実施例と同様であるので、その記載は省略する。 With this configuration, it is possible to reduce the inductance value of the inductor L1 of the
Since other configurations, operations, and effects are the same as those in the first to third embodiments, description thereof is omitted.
図8は、この発明の第5実施例に係るアンテナを示す概略斜視図である。
図8に示すように、この実施例のアンテナ1-5は、アンテナ部A1,A2を誘電体ブロック7上に形成した。
具体的には、L字状の放射電極4を誘電体ブロック7の前面71上に形成し、この放射電極4を、非グランド領域101上にパターン形成された配線パターン113を通じて給電部110に接続した。そして、集中定数素子としてのインダクタ111,112でなる整合回路を配線パターン113上に実装した。
また、ループ状の放射電極5と直線状の放射電極6とは、誘電体ブロック7の上面72上に近接させて形成した。
また、放射電極4と放射電極5と放射電極6とを接続するための配線パターン124を誘電体ブロック7の前面71と上面72とに渡って形成し、リアクタンス回路30を構成する集中定数素子であるインダクタL0及び可変容量ダイオードD0と、リアクタンス回路31を構成する集中定数素子である可変容量ダイオードD1及びインダクタL1と、リアクタンス回路32を構成する集中定数素子であるインダクタL2とを、この配線パターン124上に実装した。そして、配線パターン124上の接続点Pに接続される配線パターン125を前面71と非グランド領域101とに渡って形成して、同調電圧源120に接続させ、集中定数素子路である高周波カット用抵抗121,123及びDCパスコンデンサ122をこの配線パターン125上に実装した。
さらに、配線パターン131を放射電極5の右角部から上面72,前面71及び非グランド領域101に渡って形成し、グランド領域102に接続させた。そして、集中定数素子であるインダクタ130をこの配線パターン131上に実装した。 Next explained is the fifth embodiment of the invention.
FIG. 8 is a schematic perspective view showing an antenna according to a fifth embodiment of the present invention.
As shown in FIG. 8, in the antenna 1-5 of this embodiment, the antenna portions A1 and A2 are formed on the
Specifically, the L-shaped
Further, the loop-shaped
Further, a
Further, the
その他の構成、作用及び効果は、上記第1ないし第4実施例と同様であるので、その記載は省略する。 With this configuration, by changing the dielectric constant of the
Other configurations, operations, and effects are the same as those in the first to fourth embodiments, and thus description thereof is omitted.
Claims (6)
- そのリアクタンス値を変化させることで第1の共振周波数を変化させることができる第1の周波数可変回路を有した第1のアンテナ部と、そのリアクタンス値を変化させることで第2の共振周波数を変化させることができる第2の周波数可変回路を有した第2のアンテナ部とを備えるアンテナであって、
上記第1のアンテナ部を、基端部が給電部に接続された第1の放射電極と、一方端がこの第1の放射電極の先端部に接続された上記第1の周波数可変回路と、基端部がこの第1の周波数可変回路の他方端に接続され且つ開放状態の先端部が上記基端部側に廻り込んで隣り合うループ状の第2の放射電極とで構成し、
上記第2のアンテナ部を、上記第1の放射電極と、一方端がこの第1の放射電極の先端部に接続された上記第2の周波数可変回路と、基端部がこの第2の周波数可変回路の他方端に接続され、且つ開放状態の先端部が上記第2の放射電極の途中部に近接して当該途中部に容量結合した第3の放射電極と、当該第2の放射電極とで構成した、
ことを特徴とするアンテナ。 A first antenna unit having a first frequency variable circuit that can change the first resonance frequency by changing the reactance value, and a second resonance frequency by changing the reactance value. An antenna comprising a second antenna unit having a second frequency variable circuit that can be
The first antenna unit includes a first radiating electrode having a base end connected to the power feeding unit, and the first frequency variable circuit having one end connected to the tip of the first radiating electrode, A base end portion is connected to the other end of the first frequency variable circuit, and an open front end portion wraps around the base end portion side to form an adjacent loop-shaped second radiation electrode,
The second antenna unit includes the first radiating electrode, the second frequency variable circuit having one end connected to the tip of the first radiating electrode, and a base end having the second frequency. A third radiating electrode connected to the other end of the variable circuit and having an open end portion close to the middle portion of the second radiation electrode and capacitively coupled to the middle portion; and the second radiation electrode; Configured with
An antenna characterized by that. - 上記第1の放射電極と、一方端がこの第1の放射電極の先端部に接続され且つそのリアクタンス値を変化させることで第n(n=3以上の整数)の共振周波数を変化させることができる第nの周波数可変回路と、基端部がこの第nの周波数可変回路の他方端に接続され、且つ開放状態の先端部が上記第2の放射電極の途中部に近接して当該途中部に容量結合した第n+1の放射電極と、当該第2の放射電極とで構成される第nのアンテナ部を追加した、
ことを特徴とする請求項1に記載のアンテナ。 The first radiating electrode and one end of which is connected to the tip of the first radiating electrode, and the reactance value is changed to change the nth (n = an integer of 3 or more) resonance frequency. An n-th frequency variable circuit, a base end portion of which is connected to the other end of the n-th frequency variable circuit, and an open distal end portion is close to the mid-section of the second radiation electrode and the mid-section An n-th antenna unit composed of the (n + 1) -th radiation electrode capacitively coupled to the second radiation electrode and the second radiation electrode is added.
The antenna according to claim 1. - 上記第2の放射電極の開放状態の先端部と上記基端部側とを近接させて容量結合させた、
ことを特徴とする請求項1又は請求項2に記載のアンテナ。 The distal end portion of the second radiation electrode in the open state and the proximal end portion side are brought close to each other and capacitively coupled.
The antenna according to claim 1 or 2, characterized by the above. - 上記第1のアンテナ部ないし第nのアンテナ部のいずれか又は全てを誘電体ブロック上に形成した、
ことを特徴とする請求項1ないし請求項3のいずれかに記載のアンテナ。 Any or all of the first to nth antenna portions are formed on a dielectric block.
The antenna according to any one of claims 1 to 3, wherein the antenna is provided. - 上記第1の周波数可変回路ないし第nの周波数可変回路は、その容量値を制御電圧で変化可能な可変容量ダイオードを含む、
ことを特徴とする請求項1ないし請求項4のいずれかに記載のアンテナ。 The first frequency variable circuit to the nth frequency variable circuit include a variable capacitance diode whose capacitance value can be changed by a control voltage.
The antenna according to any one of claims 1 to 4, wherein the antenna is provided. - 請求項1ないし請求項5のいずれかに記載のアンテナを具備する、
ことを特徴とする無線通信機。 Comprising the antenna according to any one of claims 1 to 5,
A wireless communication device.
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CN102810732B (en) * | 2011-05-31 | 2016-08-03 | 深圳光启创新技术有限公司 | A kind of antenna and there is the mimo antenna of this antenna |
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Also Published As
Publication number | Publication date |
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JP5051296B2 (en) | 2012-10-17 |
JPWO2010016298A1 (en) | 2012-01-19 |
CN102144334B (en) | 2014-02-19 |
DE112009001935T5 (en) | 2012-02-02 |
CN102144334A (en) | 2011-08-03 |
DE112009001935B4 (en) | 2013-06-27 |
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