JP3966265B2 - Antenna structure and communication device having the same - Google Patents

Description

  The present invention relates to an antenna structure provided in a wireless communication device such as a mobile phone and a communication device including the antenna structure.

  FIG. 10A shows an example of an antenna structure in a schematic perspective view (see, for example, Patent Document 1). In the antenna structure 30, the radiation electrodes 31 and 32 are connected via a connecting portion 33, and a ground conductor 34 is provided so as to face the radiation electrodes 31 and 32 with a gap therebetween. Both the radiation electrodes 31 and 32 are connected to the ground conductor 34 via a short-circuit conductor 35 connected to the connecting portion 33. In addition, a power supply conductor 36 is connected to the connecting portion 33, and the radiation electrodes 31 and 32 are connected to, for example, a high-frequency circuit 37 for wireless communication of a communication device via the power supply conductor 36.

JP 2003-101336 A

  The antenna structure 30 is produced, for example, by bending a conductor plate having a shape as shown in FIG. 10 (b) punched from a sheet metal at each of the dotted line A, dotted line B, and dotted line C shown in FIG. 10 (b). can do.

  However, in the configuration of the antenna structure 30, the radiation electrodes 31 and 32 and the ground conductor 34 are arranged to face each other. It is very troublesome to fabricate the radiation electrodes 31 and 32 and the grounding conductor 34 that are arranged so as to face each other by bending them from a single conductor plate. The ground conductor 34 is configured to be opposed to the whole of the radiation electrodes 31 and 32, and the area of the conductor plate required for producing the ground conductor 34 is a conductor necessary for producing the radiation electrodes 31 and 32. It is necessary to be as wide as the area of the plate, which increases the material cost.

  The present invention has been made to solve the above problems, and an object of the present invention is to provide an antenna structure that is easy to manufacture and inexpensive and a communication device including the antenna structure.

  In order to achieve the above object, the present invention has the following configuration as means for solving the above problems. That is, the present invention includes a substrate on which a ground portion is formed, a radiation electrode composed of a conductor plate that performs antenna operation with one end side as a ground end side, and one end side that radiates on both sides of the radiation electrode. A grounding extension portion, which is connected to the grounding end side of the electrode and extends in a horizontal direction along the substrate surface from the connection portion and forms a pair in which the extension tip portion is connected to the ground portion of the substrate. An open end opposite to the end is disposed along the substrate surface with a space from the substrate surface, and the pair of grounding extending portions radiate from a connection portion with the grounding end side of the radiation electrode. An expanding portion is provided to widen the inner distance between the two extending portions for grounding at an intermediate position extending along the electrode, the inner space on the extending tip side is expanded from the expanding portion, and the expanding portion Both extension parts for grounding on the connection side with the grounding end side of the radiation electrode The outer spacing, is characterized in that are narrower than the inner space of the stretching distally. The communication device of the present invention is characterized in that an antenna structure having a characteristic configuration in the present invention is provided.

  According to this invention, the grounding end side of the radiation electrode is configured to be connected to the ground portion of the substrate via the grounding extending portions disposed on both sides of the radiation electrode. The radiation electrode and the extending portion for grounding can be produced, for example, by bending a common conductor plate. In this invention, since the formation position of the radiation electrode and the formation position of the grounding extension portion are arranged so as not to overlap with each other, the radiation electrode and the grounding extension portion can be produced by simple bending of the conductor plate. . This facilitates mass production of the antenna structure.

  By the way, for example, assuming that the grounding extending portion has the same width as the width between the side end surfaces on both sides of the radiation electrode, and the grounding extending portion is connected to the radiation electrode surface from the grounding end side of the radiation electrode via the radiation electrode. It is set as the form extended toward the open end part side of a radiation electrode so as to oppose, and it is set as the structure which connects the extending | stretching front-end | tip part to the ground part of a board | substrate. A current is passed between the ground portion of the substrate and the ground end side of the radiation electrode due to the antenna operation of the radiation electrode, but the ground extension portion has the same width as the radiation electrode as described above. In such a case, the current resulting from the antenna operation of the radiation electrode is not supplied uniformly to the entire extending portion for grounding but is concentrated to the side edge portion. In consideration of this, the grounding extending portion can be prevented from having a great influence on the electrical characteristics of the antenna structure even if only the side edge portion where the current concentrates is formed. In this invention, since the extending portions for grounding are arranged on both sides of the radiation electrode and can be made into a state equivalent to the form of only the side edge portion where the current is concentrated as described above, The grounding extending portion can be made thinner than the radiating electrode while preventing a large influence on the characteristics, and the area of the conductor plate required for producing the grounding extending portion can be reduced. Thereby, the material cost can be reduced, and the cost of the antenna structure can be reduced.

  Further, according to the present invention, each of the extending portions for grounding that form a pair provided on both sides of the radiation electrode is provided with an expanding portion, and the extending tip side (connection to the ground portion of the substrate) is provided with respect to the expanding portion. The inner distance between the two grounding extension parts on the part side) is widened, and the outer spacing between the two grounding extension parts on the base end side (connection part side with the radiation electrode) is wider than the extension part. It was set as the structure narrower than the inner space | interval of. For example, in the unfolded state of the conductive plate constituting the radiating electrode and the extending portion for grounding connected to the radiation electrode, the position of the extending tip of the extending portion for grounding is arranged to protrude ahead of the radiating electrode. When it exists, the inner side area | region between the extending | stretching front end sides of the extending part for grounding becomes a gap. In this case, for example, in the manufacturing process, when a plurality of connecting members composed of the radiation electrode and the grounding extending portion connected to the radiation electrode are punched from the conductor plate (sheet metal), in the present invention, the extending tips of the both grounding extending portions are used. A portion between the base end sides of both grounding extending portions of the adjacent connecting body narrower than the gap can be inserted into the gap in the inner region between the sides.

  Thus, when a plurality of connecting members are punched from the conductor plate, a part of the other connecting member is located in the inner region between the extending tip sides of the grounding extending portions that form a pair of adjacent one connecting members. By being able to be placed and inserted, the dead space of the conductor plate can be reduced. Thereby, the number of the said connection body which can be taken out from a conductor board can be increased, and the reduction of the material cost of the antenna structure of this invention can be aimed at.

  In addition, since the outer space between the two extending portions for grounding on the connection portion side of the radiation electrode with respect to the grounding end side of the radiation electrode is made narrower than the inner space on the extending tip side, the following effects are obtained. Can be obtained. For example, when the antenna structure is accommodated in the housing of the communication device, a configuration is formed in which a gap is formed between one end of the substrate of the antenna structure and the inner wall surface of the housing. If the housing part that is located on the outer side of the one end side of the board is provided with screw holes that are paired with a gap in the width direction of the board, these screw holes are formed. In the inner region between the positions, the narrow (thin) part as described above is arranged on the connection part side with the ground end side of the radiation electrode rather than the spread part. By providing this configuration, for example, even if the interval between the screw holes forming a pair is variable due to a design change or the like, the change in the screw hole interval is assumed in advance in the changed screw hole interval region. In order to be able to place the portion closer to the grounded end of the radiation electrode than the widened portion of the antenna structure, the outer distance of the portion closer to the grounded end of the radiating electrode than the widened portion is set in advance. If designed, the antenna structure can be accommodated in the changed housing without changing the shape of the radiation electrode of the antenna structure or the extending portion for grounding.

  Further, for example, when the antenna structure is accommodated and arranged on the end side in the casing of the communication device, the outer side edge of the extending portion for grounding has a shape along the inner wall surface on the end side of the casing. Even when the width of the casing is the same, when the roundness of the corner of the casing is different for each type of communication device, the shape of the outer side edge of the extending portion for grounding needs to be different for each model. On the other hand, in the present invention, since the outer space between the extending portions for grounding on the connecting portion side of the radiation electrode with respect to the grounding end side of the radiating electrode is made narrower than the inner space on the extending tip side than the expanded portion. The antenna structure of the present invention can be arranged by avoiding a portion that is affected by the difference in roundness of the corner of the casing and by arranging a narrower portion on the connection portion side with respect to the grounding end side of the radiation electrode than the expansion portion. Can be incorporated in a plurality of models having different degrees of roundness at the corners of the housing. Since the parts can be shared in this way, the parts cost of the communication device can be reduced, and the cost reduction of the communication device can be promoted.

  When the antenna structure is accommodated and arranged in a housing that can be regarded as a ground or in a housing that is provided with a ground portion, the extending tip of the extending portion for grounding is connected to the ground portion of the substrate. Instead of this, it is possible to use, for example, a part of the case of the communication device as an antenna by using a configuration that is connected to a ground that can be regarded as a ground or a ground portion provided in the housing. it can.

  Since the dielectric structure is provided on at least a part of the radiation electrode of the antenna structure, the electrical length (electric length) of the radiation electrode can be increased due to the wavelength shortening effect of the dielectric. Miniaturization can be achieved. In addition, deformation of the radiation electrode can be prevented.

  As described above, a plurality of radiation electrodes are arranged at intervals from each other, and at least one of the plurality of radiation electrodes is provided with a radiation electrode having a configuration unique to the present invention. In addition to providing such effects, it is easy to increase the frequency band for wireless communication by configuring each radiation electrode to resonate at a resonance frequency shifted from each other. Wireless communication in different frequency bands can be made possible.

  Also, it is possible to widen the frequency band by adopting a configuration in which at least one of the plurality of radiating electrodes is configured as a feeding type radiating electrode and the other radiating electrodes are configured as non-feeding type radiating electrodes. Can do.

  When the radiation electrode is provided with a dielectric, the radiation electrode and the dielectric are integrally formed by the insert molding technology, so that the antenna structure can be manufactured even when the radiation electrode is provided with the dielectric. Can be prevented from becoming complicated.

  FIG. 8A shows an example of an antenna structure in the middle of development up to the antenna structure of the present invention in a schematic perspective view, and FIG. 8B shows the right side of FIG. 8A. A schematic side view when the antenna structure is viewed from FIG. 8C is shown, and FIG. 8C shows a schematic plan view when the antenna structure is viewed from the upper side of FIG.

  The antenna structure 1 includes a substrate 2 on which a ground portion (not shown) is formed, a radiation electrode 3 disposed on one end of the substrate 2, and radiation disposed on both sides of the radiation electrode 3. A grounding extending portion 4 (4A, 4B) that forms a pair connecting the electrode 3 to the ground portion of the substrate 2 is provided. The board 2 is a circuit board built in a wireless communication device such as a mobile phone.

  The radiation electrode 3 includes a main surface portion 3A and a rising portion 3B. The end S on the rising portion 3B side is a ground end, and the end K on the main surface portion 3A side is an open end ( The opposite end of the ground contact). In this example, the rising portion 3B is disposed outside the end portion of the substrate 2, and the open end side of the main surface portion 3A is disposed so that the upper side of the substrate 2 is along the substrate surface with a distance from the substrate surface. ing. The antenna structure 1 is accommodated and disposed in a housing 6 of a communication device having a shape as shown by a dotted line in FIGS. 8B and 8C. The main surface portion 3A and the rising portion 3B of the radiation electrode 3 are formed so as to follow the inner wall surface of the housing 6. The main surface portion 3A is provided with an inclined portion corresponding to the taper on the end side of the housing 6. Yes.

  Such a radiation electrode 3 is directly or indirectly connected via a capacitor with a radio communication high-frequency circuit 7 formed on the substrate 2 by a power supply means (not shown).

  The extending portions for grounding 4A and 4B are connected to the side edge portion on the grounding end side of the radiation electrode 3, and the horizontal position along the substrate surface extends from the connection portion with the radiation electrode 3 to the outer position of the radiation electrode 3. Is stretched. In this example, the connecting portion between the grounding end side of the radiation electrode 3 and the extending portion for grounding 4 is disposed at a position below the substrate 2, and the extending portions for grounding 4A and 4B are radiated as described above. After extending in the horizontal direction from the connection portion with the electrode 3, it rises along the end surface of the substrate 2, and this rising portion is bent toward the substrate surface side at a midway position and disposed along the substrate surface. A portion of the grounding extending portion 4 along the substrate surface (a portion on the extending tip side) is connected to the ground portion of the substrate 2. As shown in FIG. 8C, the outer side edge portion of the grounding extending portion 4 has a shape along the side wall surface of the housing 6 to be accommodated.

  By the way, a gap is provided between the end of the substrate 2 and the housing 6, and the antenna structure 1 uses the gap to effectively arrange the radiation electrode 3 and the grounding extending portion 4. Yes. As shown by the dotted lines N1 and N2 in FIG. 8C, the region of the housing 6 in the arrangement region of the radiation electrode 3 and the grounding extending portion 4 (that is, the region outside the end of the substrate 2). Paired screw holes are provided at intervals. In this example, the housing 6 is a combination of an upper housing that covers the front surface side of the substrate 2 and a lower housing that covers the back surface side of the substrate 2, and the screw holes N1 and N2 It is used for screwing the upper housing and the lower housing. The extending portions 4A and 4B for grounding have shapes in which portions corresponding to the positions where the screw holes N1 and N2 are formed are cut away in order to avoid screws inserted into the screw holes N1 and N2. .

  The antenna structure 1 shown in FIG. 8 is configured as described above. For example, when a signal for transmission is supplied from the high-frequency circuit 7 to the radiation electrode 3 of the antenna structure 1, a current I as shown in FIG. A current for transmission is generated by energizing the radiating electrode 3 by energizing the radiating electrode 3 from the extending tip side (ground connecting end side) through the ground extending portion 4 through the grounding end S of the radiating electrode 3 toward the open end K side. Wirelessly transmitted. Further, when a signal arrives at the radiation electrode 3 from the outside and the radiation electrode 3 is excited by receiving this signal, the reception signal is transmitted from the radiation electrode 3 to the high frequency circuit 7.

  When manufacturing the radiation electrode 3 and the ground extending portion 4 of the antenna structure 1 as described above, for example, a conductor plate 9 having a shape as shown in FIG. 9 is punched from a sheet metal, and then the punched conductor plate is illustrated. The radiation electrode 3 and the grounding extending portion 4 having the form as shown in FIG.

  In the antenna structure 1, the radiation electrode 3 and the ground extending portion 4 are configured so as not to overlap when viewed from above, as shown in FIG. 8C. For this reason, the radiation plate 3 and the extending portion 4 for grounding can be manufactured by continuously processing the conductor plate by punching the conductor plate and simple bending. This simplifies the manufacturing process of the antenna structure 1 and facilitates mass production of the antenna structure 1.

  The antenna structure 1 of FIG. 8 has the following points to be improved. For example, even if the width of the housing 6 of the communication device and the width of the substrate 2 are the same, if the models are different, the positions of the screw holes N1 and N2 provided in the housing 6 and the roundness of the corners of the housing 6 The degree (curvature) is often different. As described above, the grounding extending portion 4 is provided with notches corresponding to the positions where the screw holes N1 and N2 are formed, and the outer edge of the grounding extending portion 4 is formed at the corner of the housing 6. Since there is a portion with a shape corresponding to the roundness, if the formation positions of the screw holes N1 and N2 and the roundness of the corners of the housing 6 differ depending on the model, the formation positions of the screw holes N1 and N2 for each model In addition, the extending portion 4 for grounding according to the roundness of the corner of the housing 6 must be produced. For this reason, it is necessary to prepare a separate antenna structure 1 for each model. Further, when the formation positions of the screw holes N1 and N2 are changed, it is necessary to change the shape of the grounding extending portion 4 according to the change. Furthermore, the antenna structure 1 has a demand for cost reduction.

  The present inventor has improved the antenna structure 1 of FIG. 8 in consideration of the above-described improvement problems, and obtained the antenna structure of the present invention. Embodiments according to the present invention will be described below with reference to the drawings.

  FIG. 1A is a schematic perspective view showing the antenna structure of the first embodiment, and FIG. 1B is a schematic side view of the antenna structure viewed from the right side of FIG. FIG. 1C schematically shows a plan view of the antenna structure viewed from the upper side of FIG. In the description of the first embodiment, the same components as those of the antenna structure shown in FIG.

  As in the antenna structure 1 shown in FIG. 8, the antenna structure 1 of the first embodiment is composed of a substrate 2 provided with a ground portion (not shown) and a conductor plate having one end side as a ground end side. The radiating electrode 3 is arranged on both sides of the radiating electrode 3, one end is connected to the grounding end side of the radiating electrode 3, and is extended in the horizontal direction from the connection portion along the substrate surface. It has the extending part 4 for grounding (4A, 4B) which comprises the pair connected to the part. The radiation electrode 3 includes a main surface portion 3A and a rising portion 3B, and is directly connected to a high-frequency circuit formed on the substrate 2 or indirectly through a capacitor. .

  Also, the antenna structure 1 of the first embodiment is configured to be housed and disposed in a housing 6 of a communication device such as a portable telephone, similarly to the antenna structure 1 of FIG. 3 main surface portion 3A and rising portion 3B are formed along the inner wall surface of the end portion of housing 6 as shown by the dotted line in FIG. In the first embodiment, a space U surrounded by the radiation electrode 3 and the extending portion 4 for grounding is formed. In order to effectively use the space U, for example, components for configuring a communication device (for example, components such as a speaker and an infrared emitting unit for performing infrared communication) may be disposed in the space U. The extending portion 4 for grounding is a portion that acts as a radiation electrode instead of a ground, but is a portion near zero potential because it is close to the grounding point. Therefore, by disposing the electronic component in the space U surrounded by the grounding extending portion 4, it is possible to reduce noise radiated from the electronic component disposed in the vicinity of the grounding extending portion 4. Thus, it is possible to suppress the occurrence of problems caused by radiation noise from components.

  In the first embodiment, the extending portions for grounding 4A and 4B are extended toward the substrate 2 along the side edges of the radiating electrode 3 from the connecting portion with the radiating electrode 3, and the extending portion for grounding is provided. 4A and 4B are provided with an expanding portion 10 at a position in the middle of the stretching. The expanding portion 10 is a portion where each of the grounding extending portions 4A and 4B is bent outwardly in a direction in which the inner distance on the extending tip side between the paired grounding extending portions 4A and 4B is increased. Here, the outer space Ds (see FIG. 1C) between the grounding extending portions 4A, 4B closer to the base end side (that is, the connecting portion side to the radiation electrode 3) than the expanding portion 10 is the expanding portion. The bending angle of the expanding portion 10 is set so as to be narrower than the inner distance Dk between the grounding extending portions 4A and 4B closer to the extending tip than 10.

  By the way, the housing 6 in which the antenna structure 1 of the first embodiment is accommodated is disposed at a position outside the end of the substrate 2 of the antenna structure 1 as shown by a dotted line in FIG. There are cases in which the screw holes N1 and N2 forming the above are arranged with a gap therebetween. In the first embodiment, the portion of the antenna structure 1 that is closer to the base end side than the widened portion 10 of the grounding extending portions 4A and 4B is disposed in the inner region between the positions where the screw holes N1 and N2 are formed. The outer distance Ds between the grounding extending portions 4A and 4B closer to the base end side than the expanded portion 10 and the formation position of the expanded portion 10 are set so as to be able to do so.

  The antenna structure 1 of the first embodiment is configured as described above. The radiation electrode 3 and the grounding extending portion 4 constituting the antenna structure 1 can be formed into a form as shown in FIG. 1 by bending a conductor plate 11 having a shape as shown in FIG. 2 at a dotted line position. . The antenna structure 1 can be constructed by attaching the radiation electrode 3 and the grounding extending portion 4 thus formed to the substrate 2.

  In the first embodiment, as shown in FIG. 2, when the radiation electrode 3 and the grounding extension part 4 are deployed, the extension tip of the grounding extension part 4 is the open end K of the radiation electrode 3. It is arrange | positioned in the position protruded rather than.

  As described above, the outer distance Ds between the grounding extending portions 4A and 4B closer to the base end side than the expanding portion 10 is between the grounding extending portions 4A and 4B extending from the expanding portion 10 as described above. The following effects can be obtained by providing a configuration that is narrower than the inner distance Dk. That is, when a plurality of conductor plates 11 having a shape as shown in FIG. 2 for forming the radiation electrode 3 and the grounding extending portion 4 are punched from the sheet metal, as shown in FIG. 4B, a plurality of conductor plates in a state where the grounding end side of the radiation electrode 3 of the adjacent conductor plate 11 and the base end side of the grounding extending portions 4A, 4B are inserted in the inner region between the extending distal end sides of the adjacent conductor plates 11 11 can be punched from the sheet metal.

  In the antenna structure 1 shown in FIG. 8, the outer spacing between the proximal ends of the grounding extending portions 4A and 4B is wider than the inner region between the extending distal ends of the grounding extending portions 4A and 4B. When a plurality of conductor plates 11 for producing the grounding extension portion 4 are punched from the sheet metal, the formation regions of the respective conductor plates 11 cannot be arranged so as to overlap each other as shown in FIG. . For this reason, the inner region (the region surrounded by the chain line Z in FIG. 3B) between the extending ends of the grounding extending portions 4A and 4B becomes a dead space that is wasted without being used. On the other hand, in the present invention, as described above, since the dead space can be used effectively, the dead space can be reduced. As a result, for example, the number of conductor plates 11 that can be taken out from the sheet metal can be increased, and the material cost of the antenna structure 1 can be reduced.

  Therefore, the antenna structure 1 according to the first embodiment can be manufactured by a simple bending process of the conductor plate 11 as shown in FIG. 2, so that it is possible to obtain an effect that the manufacturing cost can be reduced. Since the material cost can be reduced as described above, it is easy to reduce the cost of the antenna structure 1.

  Further, in the configuration of FIG. 8, the outer side edge portions of the grounding extending portions 4A and 4B are shaped along the inner wall surface of the housing 6, and therefore, for example, the corners of the housing 6 are rounded as shown in FIG. In the case shown by the solid line R1 and the case shown by the chain line R2, the shapes of the outer side edges of the grounding extending portions 4A and 4B are made different depending on the roundness of the corners of the housing 6. There was a need. On the other hand, in the configuration of the first embodiment, the antenna structure 1 is expanded in the inner region between the screw holes N1 and N2 forming a pair of the casing 6 as shown by the dotted line in FIG. This is a configuration in which a narrow part closer to the base end side than the opening 10 is arranged. For this reason, the widths dr1 and dr2 on the end side of the case 6 differ depending on the roundness of the corners of the case 6, but the base ends of the extending portions 4A and 4B for grounding forming a pair in the first embodiment. Since the outer space between the sides is so narrow that it is not affected by the difference in roundness of the corners, the same antenna structure 1 should be accommodated in the housing 6 even if the roundness of the corners of the housing 6 is slightly different. Can do.

  Therefore, even if the interval between the screw holes N1 and N2 and the degree of roundness of the corners of the housing 6 are slightly different depending on the communication device model, the antenna structure 1 of the first embodiment is different in such a model. It is possible to incorporate the antenna structure 1 common to a plurality of models regardless of the difference between the screw holes N1 and N2 and the difference in roundness of the corners of the housing 6. This can also contribute to cost reduction of the antenna structure 1.

  In addition to the configuration shown in FIG. 1, for example, a dielectric 13 as shown by a dotted line in FIG. Thus, by providing the dielectric 13 on the radiation electrode 3, the radiation electrode 3 can be downsized due to the wavelength shortening effect of the dielectric 13. Further, the deformation of the radiation electrode 3 can be suppressed.

  As described above, when the dielectric 13 is provided on the radiation electrode 3, for example, the dielectric 13 and the radiation electrode 3 can be integrally formed by an insert molding technique, and the manufacturing process can be simplified. . When the radiation electrode 3 and the dielectric 13 are integrally formed as described above, the dielectric 13 is made of, for example, a thermoplastic resin.

  Further, when the radiation electrode 3 provided with the dielectric 13 and one structure of the grounding extending portion 4 are attached to the substrate 2 using solder, for example, the dielectric 13 is heated to a temperature higher than the melting temperature of the solder. Since the dielectric 13 is exposed, it is preferable that the dielectric 13 is made of a dielectric material having high heat resistance that is not deformed even by heat at a temperature higher than the melting temperature of the solder. As a specific example, for example, a dielectric material having high heat resistance constituting the dielectric 13 may be a resin having a melting point of 280 ° C. or higher.

  The second embodiment will be described below. In the description of the second embodiment, the same components as those in the first embodiment are denoted by the same reference numerals, and duplicate descriptions of common portions are omitted.

  In the second embodiment, as shown in FIG. 5, the antenna structure 1 has a configuration in which a plurality of radiation electrodes 3 and 15 are arranged in parallel with each other, and one radiation electrode 3 is The configuration is the same as that of the radiation electrode 3 shown in the first embodiment, and the side edges on both sides of the radiation electrode 3 on the ground end S side are the same as those described in the first embodiment. One end side of the grounding extending portion 4 (4A, 4B) is connected.

  In the second embodiment, both of the radiation electrodes 3 and 15 may be a power supply type connected to the radio communication high-frequency circuit 7 formed on the substrate 2 or the radiation electrode 3. Is a feed type connected to the high-frequency circuit 7, and the radiation electrode 15 is a non-feed type that electromagnetically couples with the radiation electrode 3 and performs an antenna operation together with the radiation electrode 3 to create a double resonance state. Also good.

  As described above, when the antenna structure 1 includes the plurality of radiation electrodes 3 and 15, it is possible to provide the antenna structure 1 capable of wireless communication in a plurality of different frequency bands. In addition, when the radiation electrodes 3 and 15 are used to create a double resonance state, the frequency band can be easily widened. Further, for example, when the radiation electrodes 3 and 15 are electromagnetically coupled so that the radiation electrodes 3 and 15 can function as a series of radiation electrodes, for example, when the required frequency band is changed, the radiation is emitted. By changing the design of the radiation electrode 15 without changing the electrode 3, the frequency band can be changed.

  In the example of FIG. 5, an example in which the radiation electrode 3 having the configuration shown in the first embodiment and another radiation electrode 15 are arranged in parallel with an interval is shown. It is good also as a structure by which the radiation electrode 3 (namely, radiation electrode 3 with which the extending | stretching part 4 for grounding is connected) with the structure shown in the form example was arranged in multiple numbers. Further, as shown in FIG. 6A, the radiation electrode 3 may be divided into a plurality of parts (in the example of FIG. 6A, the structure is divided into two radiation electrodes 3a and 3b). Furthermore, the configuration of the radiation electrode 15 provided separately from the radiation electrode 3 is not limited to the example illustrated in FIG. 5. For example, the radiation electrode 15 as illustrated in FIG. It may be provided. The radiation electrode 15 is a modification of the radiation electrode 3, and the grounding extending portion 4 is provided only on one side of the radiation electrode 3.

  In addition, as described in the first embodiment, the dielectric 13 may be provided on at least a part of the radiation electrode 3, but the other radiation electrode 15 shown in the second embodiment is also partially or entirely. For example, a dielectric may be provided on the substrate 2 side. When the dielectric is provided on the radiation electrode 15 as described above, the radiation electrode 15 can be reduced in size by the wavelength shortening effect of the dielectric. Further, the deformation of the radiation electrode 15 can be prevented.

  The third embodiment will be described below. The third embodiment relates to a communication device. The communication device of the third embodiment is provided with the antenna structure 1 shown in the first or second embodiment. That is, the circuit board of the communication device functions as the board 2 of the antenna structure 1, and the radiation electrode 3 and the grounding extending part 4 are disposed on one end side of the circuit board. The end portions of the housing 6 where the antenna structure 1 is disposed may or may not be provided with screw holes N1 and N2 that form a pair at a position outside the substrate 2 with a gap therebetween. However, when the screw holes N1 and N2 are provided, as described in each of the first and second embodiments, the portion closer to the proximal end than the expanded portion 10 of the antenna structure 1 is a screw. The antenna structure 1 is designed so as to be arranged in the inner region between the holes N1 and N2.

  In the communication device of the third embodiment, the configuration other than the antenna structure 1 is not particularly limited, and various configurations can be adopted, and the description thereof is omitted here.

  Since the communication device of the third embodiment is provided with the antenna structure 1 shown in the first or second embodiment, for example, a common antenna structure 1 is provided for a plurality of types of communication devices. Therefore, compared with the case where the antenna structure 1 is prepared for each type, the cost of the communication device can be reduced by using the antenna structure 1 in common.

  The present invention is not limited to the first to third embodiments, and can take various embodiments. For example, a slit for controlling the resonance frequency of the radiation electrode 3 may be provided in the radiation electrode 3 shown in each of the first to third embodiments. When providing a slit for controlling the resonance frequency, a dielectric may be provided over the entire slit or a part thereof.

  In each of the first to third embodiments, the main surface portion 3A of the radiation electrode 3 is provided with the inclined portion corresponding to the taper shape of the housing 6. For example, depending on the shape of the housing 6, As shown in the side view of FIG. 7, all of the main surface portions 3A may be arranged in a direction along the substrate surface and may be orthogonal to the rising portions 3B. Thus, the form of the radiation electrode 3 is not limited to the form of the radiation electrode 3 shown in the first to third embodiments.

  Further, in each of the first to third embodiments, the extending tip portions of the grounding extending portions 4A and 4B are connected to the ground portion of the substrate 2, respectively. For example, the antenna structure 1 is a communication device, for example. The housing 6 itself is made of, for example, metal and can be regarded as a ground, or the housing 6 made of, for example, resin is provided with a conductor portion (ground portion) that can be regarded as a ground. In this case, instead of being connected to the ground portion of the substrate 2, the extending tip portions of the grounding extending portions 4 </ b> A and 4 </ b> B are connected to the housing 6 that can be regarded as the ground or the ground portion of the housing 6. It is good also as the structure currently made.

It is a figure for demonstrating the antenna structure of the example of 1st Embodiment. It is a model figure which shows an example of the conductor board for producing the radiation electrode which comprises the antenna structure of 1st Example, and the extending part for grounding. It is a figure for demonstrating one of the effects acquired from the structure of 1st Embodiment. Furthermore, it is a figure for demonstrating one of the another effects acquired from the structure of the example of 1st Embodiment. It is a figure for demonstrating the antenna structure of the example of 2nd Embodiment. It is a model figure for demonstrating other example embodiments. It is a model figure for demonstrating the other example of a radiation electrode. It is a figure for demonstrating an example of the antenna structure in the middle of development before the present invention. It is a model figure which shows an example of the conductor plate for producing the radiation electrode which comprises the antenna structure shown in FIG. 7, and the extending part for grounding. It is a figure for demonstrating the antenna structure described in patent document 1. FIG.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Antenna structure 2 Board | substrate 3,15 Radiation electrode 4 Extension part for grounding 6 Case 10 Expansion part 13 Dielectric material

Claims (10)

  A substrate on which a ground portion is formed, a radiation electrode made of a conductor plate that performs antenna operation with one end side as a ground end side, and arranged on both sides of the radiation electrode, and one end side is on the ground end side of the radiation electrode A grounding extension part that is connected and extends in a horizontal direction along the substrate surface from the connection part, and the extension tip part is connected to the ground part of the board. The open end portion is disposed along the substrate surface with a gap from the substrate surface, and the paired grounding extending portions extend along the radiation electrode from the connection portion with the grounding end side of the radiation electrode. An expansion portion is provided in the middle position to widen the inner space between the two extending portions for grounding, the inner space on the extending tip side is wider than the expanded portion, and the grounding end of the radiation electrode is more than the expanded portion. The outer distance between the extension parts for both grounding on the connecting part side is the extension destination Antenna structure, characterized in that are narrower than the inner spacing of the side.   The radiation electrode and the extending portion for grounding are formed by bending a common conductor plate, and in the unfolded state of the conductor plate before the bending processing of the extending portion for grounding connected to the radiation electrode, The antenna structure according to claim 1, wherein the position of the extending tip of the extending portion for grounding is arranged ahead of the radiation electrode.   The radiation electrode and the extending portion for grounding are configured to be housed and arranged in the inside of the housing that can be regarded as the ground, or the inside of the housing in which the ground portion is provided. 3. The antenna according to claim 1, wherein the antenna is connected to a housing that can be regarded as a ground, or a ground portion provided in the housing, instead of being connected to the ground portion of the substrate. Construction.   4. The antenna structure according to claim 1, wherein a dielectric is provided on at least a part of the radiation electrode.   A plurality of radiation electrodes are arranged at intervals from each other, and at least one of the plurality of radiation electrodes is the radiation electrode according to any one of claims 1 to 4. Characteristic antenna structure.   At least one of the plurality of radiation electrodes is a feeding type radiation electrode, the other radiation electrode is a parasitic type radiation electrode, and the parasitic type radiation electrode is a feeding type radiation electrode. 6. The antenna structure according to claim 5, wherein the antenna structure is configured to generate a double resonance state by electromagnetically coupling with the power supply type radiation electrode.   7. The antenna structure according to claim 5, wherein a dielectric is provided on at least a part of the one or more radiation electrodes.   8. The antenna structure according to claim 4, wherein the dielectric provided on the radiation electrode is made of a thermoplastic resin, and the radiation electrode and the dielectric are integrally formed by an insert molding technique.   A communication device comprising the antenna structure according to any one of claims 1 to 8.   The antenna structure is accommodated and arranged in the housing of the communication device, and a gap is formed between one end of the substrate of the antenna structure and the inner wall surface of the antenna. A pair of screw holes arranged at intervals in the width direction of the substrate are provided in the casing portion that is located outside the end of the inner region, and the inner region between the positions where these screw holes are formed A portion closer to the base end side than the widened portion of the extending portion for grounding connected to the radiation electrode is disposed inside, and the forming positions of the emitting electrode and the extending portion for grounding overlap the forming positions of the screw holes. The communication device according to claim 9, wherein there is no communication device.

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