WO2006120762A1 - アンテナ構造およびそれを備えた無線通信機 - Google Patents
アンテナ構造およびそれを備えた無線通信機 Download PDFInfo
- Publication number
- WO2006120762A1 WO2006120762A1 PCT/JP2005/012680 JP2005012680W WO2006120762A1 WO 2006120762 A1 WO2006120762 A1 WO 2006120762A1 JP 2005012680 W JP2005012680 W JP 2005012680W WO 2006120762 A1 WO2006120762 A1 WO 2006120762A1
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- WIPO (PCT)
- Prior art keywords
- resonance frequency
- line
- antenna structure
- antenna
- adjusting element
- Prior art date
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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
- H01Q1/36—Structural form of radiating elements, e.g. cone, spiral, umbrella; Particular materials used therewith
- H01Q1/38—Structural form of radiating elements, e.g. cone, spiral, umbrella; Particular materials used therewith formed by a conductive layer on an insulating support
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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
- 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
- H01Q9/0407—Substantially flat resonant element parallel to ground plane, e.g. patch antenna
- H01Q9/0421—Substantially flat resonant element parallel to ground plane, e.g. patch antenna with a shorting wall or a shorting pin at one end of the element
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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
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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
- H01Q9/40—Element having extended radiating surface
-
- 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 structure provided with a capacitive feeding type radiation electrode and a wireless communication device provided with the antenna structure.
- a surface mount type antenna mounted on a circuit board of the wireless communication device and housed and arranged in a housing of the wireless communication device.
- This surface mounted antenna has, for example, a configuration in which a radiation electrode for performing an antenna operation is formed on a dielectric base.
- Patent Document 1 Japanese Patent Application Laid-Open No. 10-173426
- Patent Document 2 Japanese Patent Application Laid-Open No. 11 312919
- Patent Document 3 Japanese Patent Application Laid-Open No. 2002-335117
- the frequency characteristics of radio waves of a wireless communication device in which a surface mount antenna is mounted on a circuit board is determined not by only the radiation electrode of the surface mount antenna but a surface mount antenna is mounted. It is determined by involvement of various elements such as circuit board ground electrodes and parts. For this reason, the resonant frequency of the radio wave for wireless communication of the wireless communication device is smaller than the resonant frequency of the radiation electrode of the surface mount antenna. From this point of view, even if the same surface mount antenna is mounted, for example, if the model of the wireless communication device is different, the resonant frequency of the radio communication radio wave of the wireless communication device (hereinafter referred to as the resonant frequency of the antenna) is If they are different, problems will arise.
- the size and shape of the ground electrode (Dandand) formed on the circuit board may be different, or the components of the component disposed around the surface mount antenna may be used.
- the condition around the surface-mounted antenna is different, such as the type, the distance between the surface-mounted antenna and the parts around it, or the material of the wireless communication device housing. It is different.
- the surrounding state of such a surface mounted antenna is involved in a complex way to determine the antenna's resonant frequency. For this reason, if the type of circuit board on which the surface mount antenna is mounted is different and the surrounding state of the surface mount antenna is different, the same surface mount antenna is installed! Nevertheless, the resonant frequency of the antenna is different.
- the same surface mount antenna is provided, the same resonance frequency of the antenna can not be obtained if the model of the wireless communication device is different. Therefore, even if the resonance frequency of the required antenna is the same, for example, The same surface mount antenna can not be provided if the model of the wireless communication device is different. For this reason, the size of the radiation electrode, for example, of the surface mount antenna needs to be custom designed for each type of wireless communication device, which is troublesome.
- circuits of circuit boards electrically connected to surface-mounted antennas may be changed according to the model of the wireless communication device, for example, except for surface-mounted antennas.
- There has been proposed a method in which a portion is custom designed to adjust the resonant frequency of the antenna to a set resonant frequency see, for example, Patent Documents 1 to 3).
- the present invention has the following configuration as means for solving the problems. That is, one configuration of the antenna structure of the present invention is
- a capacitive feeding type radiation electrode performing antenna operation is provided on a base, and the base is mounted on a non-ground area of the circuit board, and the circuit board on which the base is mounted is provided on the circuit board. And a ground line for electrically connecting the ground electrode adjacent to the non-ground region and the radiation electrode of the base.
- the grounding line has a shape having at least one or more folds, and the ground lines are connected to each other by connecting the line portions adjacent to each other via the line folds of the folds at intervals.
- An element for adjusting the resonance frequency is provided which short-cuts a part of the antenna, and the element for adjusting the resonance frequency has a capacitance or an inductance for adjusting the resonance frequency of the antenna structure to the resonance frequency set in advance. It is characterized by Further, the configuration of the wireless communication device of the present invention is characterized in that the antenna structure as described above is provided.
- the grounding line is formed to have a shape having at least one or more folded portions, and between the line portions adjacent to the grounding line via a gap between the line portions of the folded portions. Is connected to each other to short-cut part of the grounding line, and has a configuration in which a resonant frequency adjusting element is provided. With this configuration, a part of the high frequency current for energizing the grounding line is conducted through the resonant frequency adjusting element in a path for shorting part of the grounding line. As a result, the electrical length of the grounding line is shortened according to the length of the shorting of the grounding line by the high frequency current for energizing the resonance frequency adjusting element.
- the high frequency current which energizes the resonance frequency adjustment element can change the length of the shorting of the grounding line, and the electricity of the grounding line can be changed. Length can be changed.
- the electrical length of the grounding line can be variably adjusted without changing the physical length of the grounding line simply by adjusting the position of the resonance frequency adjusting element.
- the resonant frequency of the antenna structure can be variably adjusted.
- the resonance frequency adjusting element has a capacitance or an inductance
- the electric length of the grounding line can be obtained by variably adjusting the size or the inductance value of the capacitance. Can be variably adjusted, and the resonant frequency of the antenna structure can be variably adjusted.
- the arrangement position of the resonance frequency adjusting element Or, by simply adjusting the capacitance or inductance value of the resonance frequency adjustment element, the size and shape of the radiation electrode of the base, and the length, shape, and width of the grounding line can be changed.
- the frequency can be variably adjusted.
- parts (antenna parts) formed by forming the radiation electrode on the base can be commonly used for a plurality of types of wireless communication devices, and parts can be shared. This makes it easy to reduce the cost of the antenna component and the wireless communication device.
- the resonant frequency adjusting element is provided in parallel to a part of the grounding line, it is possible to suppress an increase in loss of the high frequency current, thereby reducing the antenna gain. Can be reduced.
- the wireless communication device By providing the wireless communication device with the antenna structure having such an excellent effect, it is possible to provide a wireless communication device with high performance for wireless communication and high reliability for wireless communication.
- Figure la is a schematic plan view for explaining the antenna structure of the first embodiment.
- Figure lb is a schematic perspective view of the antenna structure shown in Figure la.
- Figure lc is a schematic exploded view of the antenna structure of Figure lb.
- FIG. 2 is a graph showing an example of the relationship between the capacitance of the resonant frequency adjustment element and the resonant frequency of the antenna structure when a capacitor component is provided as the resonant frequency adjustment element.
- FIG. 3 is a graph showing an example of the relationship between the inductance value of the resonant frequency adjustment element and the resonant frequency of the antenna structure when an inductor component is provided as the resonant frequency adjustment element.
- FIG. 4 is a view for explaining an antenna structure of a second embodiment.
- FIG. 5 is a graph for explaining an example of the relationship between the arrangement position of the resonant frequency adjustment element and the resonant frequency of the antenna structure when the inductor component is provided as the resonant frequency adjustment element. .
- FIG. 6a shows a capacitor unit as an element for adjusting a resonance frequency. It is a graph for demonstrating the example of a relationship between the arrangement
- FIG. 6b illustrates an example of the relationship between the position of the resonant frequency adjustment element and the resonant frequency of the antenna structure when the capacitor component is provided as the resonant frequency adjustment element. Is a graph to
- FIG. 6c illustrates an example of the relationship between the position of the resonant frequency adjustment element and the resonant frequency of the antenna structure when the capacitor component is provided as the resonant frequency adjustment element. Is a graph to
- FIG. 7 is a model diagram for explaining another embodiment.
- FIG. La A first embodiment of the antenna structure according to the present invention is shown by a schematic plan view in FIG. La, and a schematic perspective view of the antenna structure in FIG. La is shown in FIG. Fig. 1b shows a schematic exploded view of the antenna structure of Fig. 1b.
- the antenna structure 1 of the first embodiment includes a base 2 made of a dielectric, a radiation electrode 3 and a feed electrode 4 formed on the dielectric base 2, and a dielectric base 2 surface-mounted. And the ground electrode 6 formed on the circuit board 5 and the radiation electrode 3 of the dielectric base 2 formed on the circuit board 5 to be electrically connected to the ground electrode 6 of the circuit board 5. Grounding of , The resonance frequency adjusting element 8 disposed in the grounding line 7, and the feeding line 9 formed on the circuit board 5 and electrically connected to the feeding electrode 4 of the dielectric base 2. It is configured.
- the dielectric substrate 2 is formed in a rectangular parallelepiped shape, and the upper surface force of the dielectric substrate 2 is, for example, the radiation electrode in such a manner as to go around the bottom surface through the right end face of FIG. Three are formed.
- the feed electrode 4 is formed from the bottom surface of the dielectric substrate 2 to a position facing the radiation electrode 3 on the top surface of the dielectric substrate 2 via a gap, for example, through the end face on the left side of FIG.
- the corner of the circuit board 5 is an antenna component, and the corner is formed as a ground electrode 6 to form a non-ground region.
- a dielectric substrate 2 on which a radiation electrode 3 and a feeding electrode 4 are formed is mounted (mounted) in a predetermined substrate arrangement region of the non-ground region.
- the feed line 9 is formed in the non-ground area of the antenna constituting portion of the circuit board 5, and one end of the feed line 9 is formed in the base arrangement area and electrically connected to the feed electrode 4. It is done. Further, the other end side of the power supply line 9 is electrically connected to, for example, a high frequency circuit 10 for wireless communication of a wireless communication device. That is, the feeding line 9 is to electrically connect the high frequency circuit 10 for wireless communication and the feeding electrode 4.
- the feeding line 9 is provided with a matching element 11 which forms a matching circuit for impedance matching between the feeding electrode 4 side and the high frequency circuit 10 side.
- the feeding electrode 4 is formed to be spaced apart from the radiation electrode 3, and the feeding electrode 4 and the radiation electrode 3 are configured to be electromagnetically coupled via a capacitance. That is, for example, when a signal for wireless transmission is transmitted from the high frequency circuit 10 for wireless communication through the feeding line 9 to the feeding electrode 4, capacitive coupling between the feeding electrode 4 and the radiation electrode 3 causes the feeding electrode 4 to The signal for wireless transmission is transmitted to the radiation electrode 3 from the That is, the radiation electrode 3 is configured as a capacitive feeding type radiation electrode.
- the ground electrode 6 is formed on substantially the entire area of the circuit board 5 avoiding the non-ground area at the corners of the circuit board 5 which is the antenna constituent part of the circuit board 5.
- a grounding line 7 for electrically connecting the ground electrode 6 to the radiation electrode 3 is provided in the non-ground region of the circuit board 5. It is formed.
- the grounding line 7 is formed of a U-shaped strip line having one folded portion 12.
- the element for adjusting the resonance frequency is connected to the grounding line 7 by connecting the adjacent line parts via the line folding back of the folded portion 12 through a space and shorting out a part of the grounding line 7.
- the arrangement position of the resonance frequency adjusting element 8 is determined in advance between the line portions in which the line portion on the forward side to the turnback portion 12 and the line portion on the return side are arranged in parallel.
- Lands 14a and 14b are provided at the arrangement positions of the forward line portion and the return line portion, respectively.
- the resonance frequency adjusting element 8 is electrically connected to the grounding line 7 by being bonded to the lands 14a and 14b by a conductive bonding material such as solder, for example.
- the resonant frequency adjusting element 8 is formed of a capacitor part or an inductor part, and is for adjusting the resonant frequency of the antenna structure 1. That is, the resonance frequency of the antenna structure 1 is determined only by the resonance frequency of the radiation electrode 3 and is also related to the length, width, etc. of the grounding line 7. By arranging the resonance frequency adjusting element 8 in the grounding line 7, a part of the high frequency current for energizing the grounding line 7 passes through the resonance frequency adjusting element 8 and is in the path for shorting the grounding line 7. Therefore, the electricity will be delivered.
- the resonance frequency adjusting element 8 is formed of a capacitor part or an inductor part, and the electric length of the grounding line 7 is also determined by the size of the capacitance of the resonance frequency adjusting element 8 or the inductance value. Changes.
- the resonant frequency of the antenna structure 1 decreases. In other words, as the electrical length of the grounding line 7 decreases, the resonant frequency of the antenna structure 1 increases. From this, the electrical length of the grounding line 7 is variably adjusted by changing the arrangement position of the resonant frequency adjusting element 8 and the capacitance and inductance value of the resonant frequency adjusting element 8. Thus, the resonant frequency of the antenna structure 1 can be adjusted. Note that by forming the resonant frequency adjusting element 8 with a capacitor component, the resonant frequency of the antenna structure 1 is higher than when the resonant frequency adjusting element 8 is not provided in the grounding line 7. Can be lowered.
- the electrical length of the grounding line 7 is increased as the size of the capacitance of the resonance frequency adjusting element 8 which is a capacitor component is increased.
- the resonance frequency of the antenna structure 1 can be lowered.
- the dotted line S in the graph of FIG. 2 is an example of the return loss characteristic of the antenna structure 1 when the resonance frequency adjusting element 8 is not provided.
- FIG. 2 are examples of the return loss characteristics of the antenna structure 1 in the case where a capacitor component is provided as the resonant frequency adjustment element 8, respectively.
- a capacitor component is provided as the resonant frequency adjustment element 8, respectively.
- a broken line B is an example of the case where the capacitance of the resonance frequency adjustment element 8 is 1.
- a solid line C is an element for resonance frequency adjustment. This is an example of the case where the capacitance of 8 is 1.5 pF.
- the resonance frequency of the antenna structure 1 can be lowered as the capacitance of the resonance frequency adjusting element 8 is increased.
- the resonant frequency of the antenna structure 1 is higher than when the resonant frequency adjusting element 8 is not provided in the grounding line 7. Can be raised. Further, even if the arrangement position of the resonance frequency adjusting element 8 is the same, as the inductance value of the resonance frequency adjusting element (inductor component) 8 becomes smaller, the resonance frequency adjusting element 8 is for grounding. The degree of influence on line 7 increases. As a result, the electrical length of the grounding line 7 is shortened, and the resonant frequency of the antenna structure 1 is increased.
- the dotted line S in the graph of FIG. 3 is an example of the return loss characteristic of the antenna structure 1 in the case where the resonance frequency adjusting element 8 is provided.
- the dashed-dotted lines A to D and the solid line E respectively indicate a case where an inductor component is provided as the resonance frequency adjusting element 8.
- the dashed line A is an example of the case where the inductance value of the resonant frequency adjustment element 8 is 22 nH
- the dashed line B is an example of the return loss characteristic of the resonant frequency adjustment element 8.
- the chain line C is an example in the case where the inductance value of the resonance frequency adjusting element 8 is 8.2 nH
- the chain line D is the case where the inductance value of the resonance frequency adjusting element 8 is 6. 8 nH
- the solid line E is an example when the inductance value of the resonance frequency adjusting element 8 is 4.7 nH.
- the arrangement of the resonance frequency adjusting element 8 is such that the resonance frequency of the antenna structure 1 becomes a predetermined resonance frequency.
- the capacitance or inductance value of the positioning and resonance frequency adjusting element 8 is set respectively.
- the arrangement of the resonance frequency adjusting element 8 without changing the size and shape of the radiation electrode 3 and the physical length and width of the grounding line 7 and the like. It is possible to obtain the effect that the resonant frequency of the antenna structure 1 can be adjusted to the set resonant frequency simply by variably adjusting the position, capacity or inductance value.
- the resonance frequency adjusting element 8 when a general-purpose capacitor component or inductor component is used as the resonance frequency adjusting element 8, the size of the capacitance of the resonance frequency adjusting element 8 or the numerical value of the inductance value can be changed only discontinuously. Although it can not be adjusted, the arrangement position of the resonance frequency adjusting element 8 can be varied continuously. Therefore, it is possible to adjust the resonance frequency without changing the capacitance or inductance value of the resonance frequency adjusting element 8 alone. By finely adjusting the arrangement position of the element 8, fine adjustment of the resonant frequency of the antenna structure 1 can be performed, and it becomes easy to match the resonant frequency of the antenna structure 1 to the set resonant frequency. .
- the resonance frequency adjusting element 8 is provided in parallel to a part of the grounding line 7, it is possible to suppress an increase in loss of the high frequency current. For this reason, even if the resonance frequency adjusting element 8 is provided in the grounding line 7, the fluctuation of the antenna gain can be suppressed to a small level. This is confirmed by the experiment of the inventor.
- the experiment In the following, three samples ⁇ , ⁇ and y under the same conditions were prepared except for the configuration related to the resonance frequency adjusting element 8. That is, the sample a is one in which the resonance frequency adjusting element 8 is not provided.
- the sample j 8 is provided with a capacitor component having, for example, a capacitance of 1.5 pF as the resonance frequency adjusting element 8.
- the sample ⁇ is provided with, for example, an inductor component having an inductance value 12 ⁇ as the resonance frequency adjusting element 8.
- the antenna gains of linear polarization and circular polarization were determined for each of these samples ⁇ , ⁇ and ⁇ .
- the experimental results are shown in Tables 1 to 6.
- Table 1 relates to the linear polarization of sample ⁇
- Table 2 relates to the linear polarization of sample j8, and
- Table 3 relates to the linear polarization of sample ⁇ .
- Table 4 relates to the circular polarization of sample ⁇
- Table 5 relates to the circular polarization of sample
- Table 6 relates to the circular polarization of sample ⁇ .
- Table 1 representing the antenna gain of the linearly polarized wave of the sample antenna (without the resonance frequency adjusting element 8) and the samples i8 and y (the resonance frequency adjusting element 8) are provided.
- Table 2 and Table 3 that represent the antenna gain of the linear polarization of Table 1 and Table 4 that represent the antenna gain of the circular polarization of the sample a, and the antenna of the circular polarization of the sample ⁇ and ⁇
- the resonance frequency adjustment element 8 is provided on the grounding line 7 as in the case of the components shown in Table 5 and Table 6 representing the gain, the same antenna as in the case where the resonance frequency adjustment element 8 is not provided. It can be confirmed that it is possible to obtain
- a resonance frequency adjusting element 8 is provided between line portions in which a line portion on the forward side to the turnback portion 12 of the grounding line 7 and a line portion on the return side are arranged in parallel. A plurality of positions for installation are set in advance. As shown in the schematic enlarged plan view of FIG. 4, the resonant frequency adjusting element 8 is electrically connected to the grounding line 7 at the setting positions of the resonant frequency adjusting element 8 respectively. Lands 15 to 17 are formed.
- the resonance frequency adjusting element 8 is provided at any one of a plurality of setting positions.
- the amount of change in the resonant frequency of the antenna structure 1 with respect to the amount of change in the capacitance or inductance value of the resonant frequency adjusting element 8 varies depending on the position of the resonant frequency adjusting element 8.
- the resonance frequency adjusting element 8 which is a capacitor component is, for example, the position where the land 17 shown in FIG. This is an example of the return loss characteristic in the case of being disposed closest to the return part 12).
- the graph of FIG. 6 b is an example of the return loss characteristic when the resonance frequency adjusting element 8 is disposed, for example, at the formation position of the land 16.
- the graph of FIG. 6 c is an example of the return loss characteristic when the resonance frequency adjusting element 8 is disposed, for example, at the formation position of the land 15.
- the solid line M in the graphs of FIGS. 6a to 6c represents an example of the return loss characteristic of the antenna structure 1 when the capacitance of the resonance frequency adjusting element 8 is 0.5 pF.
- the dashed-dotted line N represents an example of the return loss characteristic of the antenna structure 1 when the capacitance of the resonance frequency adjusting element 8 is 1.5 pF.
- the folded portion As shown in the graphs of FIGS. 6a to 6c, even if the capacitance of the resonance frequency adjusting element 8 is similarly varied, for example, from 0.5 pF to 1.5 pF, the folded portion As the distance from the resonance frequency adjustment element 8 to the disposition position of the resonance frequency adjustment element 8 widens and the shortcut amount of the grounding line 7 by the resonance frequency adjustment element 8 increases, the variation amount of the resonant frequency of the antenna structure 1 ⁇ f becomes large.
- broken lines b to d in the graph of FIG. 5 are an example of the return loss characteristics of the antenna structure 1 when the resonance frequency adjusting element 8 is 6. 8 nH, and a broken line b indicates the resonance frequency adjusting element 8.
- a broken line b indicates the resonance frequency adjusting element 8.
- it is an example of a return loss characteristic in the case where the land 17 in FIG. 4 is disposed at the formation position (that is, the position closest to the turnback portion 12).
- the broken line c is an example of the return loss characteristic when the resonance frequency adjusting element 8 is disposed, for example, at the formation position of the land 16.
- the broken line d is an example of the return loss characteristic when the resonance frequency adjusting element 8 is disposed, for example, at the formation position of the land 15.
- the solid line a in the graph of FIG. 5 is an example of the return loss characteristic of the antenna structure 1 when the resonance frequency adjusting element 8 is 22 nH. In this example, when the resonance frequency adjustment element 8 is 22 nH, the influence of the resonance frequency adjustment element 8 on the grounding line 7 is very small, and the resonance frequency adjustment element 8 is not a land.
- the antenna structure 1 has substantially the same return loss characteristics when disposed at any formation position of .about.17.
- the capacitance of resonant frequency adjustment element 8 is increased as the disposition position of resonant frequency adjustment element 8 moves away from turn-back portion 12.
- the amount of change in the resonant frequency of the antenna structure 1 with respect to the amount of change in the inductance value becomes large. From this, for example, the antenna structure 1 is disposed at a position close to the folded portion 12 of the grounding line 7 and the capacitance or inductance value of the resonance frequency adjusting element 8 is varied.
- the resonance frequency adjusting element 8 is disposed at a position away from the folding portion 12 of the grounding line 7, and the capacitance or inductance value of the resonance frequency adjusting element 8 is varied to obtain the resonance frequency of the antenna structure 1. Coarse adjustments can be made.
- the arrangement position of the resonant frequency adjusting element 8 and the capacitance of the resonant frequency adjusting element 8 are set such that the resonant frequency of the antenna structure 1 becomes the set resonant frequency.
- the magnitude or inductance value is variably adjusted and set.
- the third embodiment relates to a wireless communication device.
- the radio communication apparatus of the third embodiment is provided with the antenna structure 1 shown in the first or second embodiment.
- the wireless communication device there are various configurations of the wireless communication device, and any configuration may be adopted for the wireless communication device other than the antenna structure 1, and the description thereof will be omitted here. Also, since the configuration of the antenna structure 1 has been described in the first or second embodiment, the redundant description will be omitted.
- the present invention is not limited to the forms of the first to third embodiments, and can adopt various embodiments.
- only one resonance frequency adjusting element 8 is provided on the grounding line 7, but a plurality of resonance frequency adjusting elements may be provided on the grounding line 7. Eight may be provided.
- the capacitance size or inductance value of each resonance frequency adjustment element 8 is set so that the resonance frequency of the antenna structure 1 becomes the set resonance frequency.
- fold The distance from the return part 12 to the arrangement position of each resonance frequency adjustment element 8 and the distance between each resonance frequency adjustment element 8 are respectively variably adjusted and set.
- the grounding line 7 has a U-shaped shape in which only one folded portion 12 is provided.
- the length of the grounding line 7 is long. If you want to lower the resonant frequency of the antenna structure 1 or if the space for the non-Dandish area where the grounding line 7 can be formed is limited, the grounding line 7 may be provided with two or more folded portions 12. It may be in the shape of being.
- the grounding line 7 may have a meander shape.
- the resonance frequency adjusting element 8 is, for example, in the positions shown in the A, B and C positions in FIG. The resonance frequency of the antenna structure 1 can be adjusted by arranging.
- the resonance frequency adjusting element 8 When the resonance frequency adjusting element 8 is disposed at the B position than when the resonance frequency adjusting element 8 is disposed at the A position, the shortcut amount of the grounding line 7 by the resonance frequency adjusting element 8 is large. Therefore, it is possible to increase the amount of change in the resonant frequency of the antenna structure 1 with respect to the amount of change in the magnitude or capacitance value of the resonant frequency adjusting element 8.
- the short-cut amount of the grounding line 7 by the resonance frequency adjusting element 8 at position C is smaller than the case where the resonance frequency adjusting element 8 is disposed at the A position and B position, the resonance frequency adjusting element By disposing 8 at the C position, fine adjustment of the resonant frequency of the antenna structure 1 becomes easier than when disposing the resonant frequency adjusting element 8 at the A position or B position.
- a plurality of resonance frequency adjusting elements 8 may be provided on the grounding line 7. It is.
- the radiation electrode 3 has the shape shown in FIG. 1, if the radiation electrode 3 has a shape to be capacitively fed, FIG. It is not limited to the shape of.
- the base 2 is not limited to a rectangular parallelepiped, and may be, for example, a cylindrical or polygonal column other than a rectangular parallelepiped.
- the present invention it is possible to accurately set the frequency band while suppressing the increase in size of the antenna structure. Since it is easy to make wireless communication possible, miniaturization is required, which is effective for application to antenna structures and wireless communication devices.
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Abstract
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Priority Applications (4)
Application Number | Priority Date | Filing Date | Title |
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CN200580049724.4A CN101171721B (zh) | 2005-05-11 | 2005-07-08 | 天线结构及包含该天线结构的无线通信装置 |
DE112005003546T DE112005003546T5 (de) | 2005-05-11 | 2005-07-08 | Antennenstruktur und drahtlose Kommunikationsvorrichtung, die dieselbe umfasst |
JP2007505312A JP3992077B2 (ja) | 2005-05-11 | 2005-07-08 | アンテナ構造およびそれを備えた無線通信機 |
US11/873,633 US7786940B2 (en) | 2005-05-11 | 2007-10-17 | Antenna structure and wireless communication device including the same |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
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JP2005138725 | 2005-05-11 | ||
JP2005-138725 | 2005-05-11 |
Related Child Applications (1)
Application Number | Title | Priority Date | Filing Date |
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US11/873,633 Continuation US7786940B2 (en) | 2005-05-11 | 2007-10-17 | Antenna structure and wireless communication device including the same |
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WO2006120762A1 true WO2006120762A1 (ja) | 2006-11-16 |
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PCT/JP2005/012680 WO2006120762A1 (ja) | 2005-05-11 | 2005-07-08 | アンテナ構造およびそれを備えた無線通信機 |
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US (1) | US7786940B2 (ja) |
JP (1) | JP3992077B2 (ja) |
CN (1) | CN101171721B (ja) |
DE (1) | DE112005003546T5 (ja) |
WO (1) | WO2006120762A1 (ja) |
Cited By (3)
Publication number | Priority date | Publication date | Assignee | Title |
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WO2010087043A1 (ja) * | 2009-01-29 | 2010-08-05 | 株式会社村田製作所 | チップアンテナ及びアンテナ装置 |
WO2011086723A1 (ja) * | 2010-01-18 | 2011-07-21 | 株式会社村田製作所 | アンテナ及び無線通信装置 |
WO2012073450A1 (ja) | 2010-11-30 | 2012-06-07 | 三菱マテリアル株式会社 | アンテナ装置 |
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JP5035323B2 (ja) * | 2009-11-06 | 2012-09-26 | 株式会社村田製作所 | アンテナ |
GB2478991B (en) | 2010-03-26 | 2014-12-24 | Microsoft Corp | Dielectric chip antennas |
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US9178270B2 (en) | 2012-05-17 | 2015-11-03 | Futurewei Technologies, Inc. | Wireless communication device with a multiband antenna, and methods of making and using thereof |
CN104396086B (zh) | 2014-03-28 | 2016-09-28 | 华为终端有限公司 | 一种天线及移动终端 |
WO2016182801A1 (en) | 2015-05-11 | 2016-11-17 | Carrier Corporation | Antenna with reversing current elements |
DE102017121897B4 (de) * | 2017-09-21 | 2019-05-02 | Infineon Technologies Ag | Verfahren zum Herstellen einer Antennenstruktur, Antennenstruktur, Boosterantenne, Chipkarte und Einrichtung zum Herstellen einer Antennenstruktur |
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WO2010087043A1 (ja) * | 2009-01-29 | 2010-08-05 | 株式会社村田製作所 | チップアンテナ及びアンテナ装置 |
US8462051B2 (en) | 2009-01-29 | 2013-06-11 | Murata Manufacturing Co., Ltd. | Chip antenna and antenna apparatus |
JP5263302B2 (ja) * | 2009-01-29 | 2013-08-14 | 株式会社村田製作所 | チップアンテナ及びアンテナ装置 |
WO2011086723A1 (ja) * | 2010-01-18 | 2011-07-21 | 株式会社村田製作所 | アンテナ及び無線通信装置 |
WO2012073450A1 (ja) | 2010-11-30 | 2012-06-07 | 三菱マテリアル株式会社 | アンテナ装置 |
KR20130140043A (ko) | 2010-11-30 | 2013-12-23 | 미쓰비시 마테리알 가부시키가이샤 | 안테나 장치 |
Also Published As
Publication number | Publication date |
---|---|
JPWO2006120762A1 (ja) | 2008-12-18 |
CN101171721A (zh) | 2008-04-30 |
US20090303144A1 (en) | 2009-12-10 |
US7786940B2 (en) | 2010-08-31 |
CN101171721B (zh) | 2013-01-23 |
DE112005003546T5 (de) | 2008-02-21 |
JP3992077B2 (ja) | 2007-10-17 |
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