JP6368822B2 - Antenna and antenna polarization switching method - Google Patents
Antenna and antenna polarization switching method Download PDFInfo
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- JP6368822B2 JP6368822B2 JP2017103634A JP2017103634A JP6368822B2 JP 6368822 B2 JP6368822 B2 JP 6368822B2 JP 2017103634 A JP2017103634 A JP 2017103634A JP 2017103634 A JP2017103634 A JP 2017103634A JP 6368822 B2 JP6368822 B2 JP 6368822B2
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- 230000010287 polarization Effects 0.000 title claims description 12
- 238000000034 method Methods 0.000 title claims description 8
- 239000000463 material Substances 0.000 claims description 9
- 239000002184 metal Substances 0.000 description 20
- 238000004891 communication Methods 0.000 description 15
- 125000006850 spacer group Chemical group 0.000 description 6
- 238000010586 diagram Methods 0.000 description 5
- 230000002093 peripheral effect Effects 0.000 description 5
- 210000000078 claw Anatomy 0.000 description 4
- 239000011347 resin Substances 0.000 description 3
- 229920005989 resin Polymers 0.000 description 3
- 238000005452 bending Methods 0.000 description 2
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- 238000004080 punching Methods 0.000 description 1
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Description
本発明の実施形態は、例えば、ＲＦＩＤ（Radio Frequency Identification）タグ通信装置に用いられるアンテナ及びそのアンテナの偏波切替方法に関する。 Embodiments of the present invention relate to, for example, an antenna used in an RFID (Radio Frequency Identification) tag communication apparatus and a polarization switching method of the antenna.
近年、工場、倉庫又は店舗等で、商品管理のためにＲＦＩＤタグが利用されている。ＲＦＩＤタグを付けた物品は、工場や倉庫などでは、規則正しく並べられ、店舗では不規則に陳列される。 In recent years, RFID tags are used for product management in factories, warehouses, stores, and the like. Articles with RFID tags are regularly arranged in factories and warehouses, and are irregularly displayed in stores.
一方、ＲＦＩＤタグ通信装置は、アンテナを介して電磁波を放射し、ＲＦＩＤタグとの間で無線通信をしてＲＦＩＤタグが付された物品の情報を読み取る。 On the other hand, the RFID tag communication device radiates electromagnetic waves via an antenna, performs wireless communication with the RFID tag, and reads information on an article attached with the RFID tag.
例えば、工場や倉庫など、ＲＦＩＤタグのついた物品が規則正しく並んでいる場合には、直線偏波を用いた情報の読取りが適しており、店舗等のＲＦＩＤタグの付いた物品が不規則に陳列される場合には、円偏波を用いた読取りが適していることが知られている。 For example, when items with RFID tags are regularly arranged, such as in factories and warehouses, reading information using linearly polarized waves is suitable, and items with RFID tags such as stores are displayed irregularly. In this case, it is known that reading using circularly polarized waves is suitable.
しかし、物品の並び方に合わせて直線偏波と円偏波を使い分けるためには、直線偏波を放射可能なアンテナと円偏波を放射可能なアンテナを用意する必要があり、その分、ＲＦＩＤ通信装置の運用コストが高くなる。 However, in order to properly use linearly polarized waves and circularly polarized waves according to the arrangement of articles, it is necessary to prepare an antenna that can radiate linearly polarized waves and an antenna that can radiate circularly polarized waves. The operating cost of the device becomes high.
そこで、本発明が解決しようとする課題は、低コストで、円偏波と直線偏波の両方の偏波を容易に切替可能なアンテナ及びアンテナの偏波切替方法を提供することである。 Therefore, the problem to be solved by the present invention is to provide an antenna and an antenna polarization switching method capable of easily switching both circularly polarized waves and linearly polarized waves at low cost.
一実施形態に係るアンテナは、放射器と、給電部材と、補填部材と、切替手段とを備えている。当該放射器は、中心に対して互いに相対する位置に切欠きを有する。当該給電部材は、高周波信号を受けて前記放射器を励振させる。当該補填部材は、当該切欠きの全体を覆うように当該切欠きに配置されるとともに前記高周波信号を受けて前記放射器とともに励振する材料により形成される。当該切替手段は、前記補填部材に設けられ、当該切欠きの全体を覆う第１位置と当該切欠きから外れた第２位置との間で前記補填部材の位置を切替える。
The antenna which concerns on one Embodiment is equipped with the radiator, the electric power feeding member, the compensation member, and the switching means. The radiator has notches at positions opposite to each other with respect to the center . The power feeding member receives the high frequency signal and excites the radiator. The filling member is formed of a material that is disposed in the notch so as to cover the entire notch and receives the high-frequency signal and is excited with the radiator . The switching means is provided in the compensation member, and switches the position of the compensation member between a first position that covers the entire notch and a second position that deviates from the notch.
以下、本発明に係るアンテナの第１の実施形態について、図面を用いて説明する。なお、本実施形態は、ＲＦＩＤタグ通信装置に備えられるパッチアンテナを例示し、詳細を説明する。 Hereinafter, a first embodiment of an antenna according to the present invention will be described with reference to the drawings. In the present embodiment, a patch antenna provided in the RFID tag communication apparatus is illustrated and described in detail.
まず初めに、ＲＦＩＤタグ通信装置１について説明する。図１は、ＲＦＩＤタグ通信装置１の全体斜視図である。 First, the RFID tag communication device 1 will be described. FIG. 1 is an overall perspective view of the RFID tag communication apparatus 1.
ＲＦＩＤタグ通信装置１は、例えば、店舗や倉庫に置いてある商品の棚卸をする場合において、個々の商品に添付されたＲＦＩＤ（Radio Frequency Identification）タグと無線通信し、ＲＦＩＤタグのＥＰＣ（Electronic Product Code）データを読取る装置である。 The RFID tag communication device 1 wirelessly communicates with an RFID (Radio Frequency Identification) tag attached to each product, for example, when inventorying a product placed in a store or a warehouse, and EPC (Electronic Product) of the RFID tag Code) is a device that reads data.
ＲＦＩＤタグ通信装置１は、ハンドル２と、パッチアンテナ１００と、クリップ３と、端末Ｓとを有する。 The RFID tag communication device 1 includes a handle 2, a patch antenna 100, a clip 3, and a terminal S.
ハンドル２は、略筒状の棒状部材である。ハンドル２は、一箇所で折り曲げられ肩部２１を形成する。ハンドル２の先端には、パッチアンテナ１００が、所定の角度回動可能に取り付けられている。 The handle 2 is a substantially cylindrical rod-shaped member. The handle 2 is bent at one place to form a shoulder portion 21. A patch antenna 100 is attached to the front end of the handle 2 so as to be rotatable by a predetermined angle.
パッチアンテナ１００は、略方形の所定の厚みを有する板状の部材である。具体的には、パッチアンテナ１００は、前面カバー１１０と背面カバー１２０と後述するアンテナ部２００とを有している。前面カバー１１０及び背面カバー１２０は、アンテナ部２００の両面を覆うように配置され、アンテナ部２００を外部環境から保護する。 The patch antenna 100 is a plate-like member having a substantially square predetermined thickness. Specifically, the patch antenna 100 includes a front cover 110, a back cover 120, and an antenna unit 200 described later. The front cover 110 and the back cover 120 are disposed so as to cover both surfaces of the antenna unit 200 and protect the antenna unit 200 from the external environment.
クリップ３は、ハンドル２の肩部２１に取り付けられる。クリップ３は、ハンドル２の長手方向に沿って離間して配置される２つの爪３１を有する。２つの爪３１は、互いに離接可能に設けられる。 The clip 3 is attached to the shoulder portion 21 of the handle 2. The clip 3 has two claws 31 that are spaced apart along the longitudinal direction of the handle 2. The two claws 31 are provided so as to be separated from each other.
端末Ｓは、商品に付されたＲＦＩＤタグから受信したデータを表示するディスプレーＳ１を備えた、タブレット端末やスマートフォンを用いることができる。端末Ｓは、クリップ３の２つの爪３１の間に挟まれて固定される。 As the terminal S, a tablet terminal or a smartphone including a display S1 that displays data received from an RFID tag attached to a product can be used. The terminal S is sandwiched and fixed between the two claws 31 of the clip 3.
次に、パッチアンテナ１００の構造について、図１、及び、図２を用いて説明する。図２は、図１のＲＦＩＤタグ通信装置１のパッチアンテナ１００の背面カバー１２０及び前面カバー１１０を取り外し、アンテナ部２００を露出した状態を示している。 Next, the structure of the patch antenna 100 will be described with reference to FIG. 1 and FIG. FIG. 2 shows a state in which the antenna unit 200 is exposed by removing the back cover 120 and the front cover 110 of the patch antenna 100 of the RFID tag communication apparatus 1 of FIG.
アンテナ部２００は、図２に示すように、グランド板金３００と、放射器４００と、給電部材５００と切替手段６００とを備えている。 As shown in FIG. 2, the antenna unit 200 includes a ground metal plate 300, a radiator 400, a feeding member 500, and a switching unit 600.
グランド板金３００は、金属板を折り曲げて形成される一面が開放した箱状の部材である。具体的には、グランド板金３００は、後述する放射器４００等が固定される略矩形板状の底壁３２０と、底壁３２０の周縁に曲げ加工により形成された複数の側壁３１０と、を備える。グランド板金３００の側壁３１０の内側には、放射器４００及び給電部材５００が配置される。そして、グランド板金３００は、側壁３１０の底壁３２０から離間した縁により形成される開口部３３０を塞ぐように前面カバー１１０に取り付けられる。 The ground metal plate 300 is a box-shaped member having one surface formed by bending a metal plate. Specifically, the ground metal plate 300 includes a substantially rectangular plate-like bottom wall 320 to which a radiator 400 and the like to be described later are fixed, and a plurality of side walls 310 formed on the periphery of the bottom wall 320 by bending. . Inside the side wall 310 of the ground metal plate 300, the radiator 400 and the power supply member 500 are disposed. Then, the ground metal plate 300 is attached to the front cover 110 so as to close the opening 330 formed by an edge spaced from the bottom wall 320 of the side wall 310.
放射器４００は、図２に示すように略円環状の円板である。放射器４００は、その外周の互いに相対する位置に２つの切欠き４１０（図４）を備える。なお、２つの切欠き４１０を有することにより、放射器４００は、円偏波を放射することができる。放射器４００の前面カバー１１０側の面を第１面４２０とし、その裏側面を第２面４４０とする。放射器４００は、グランド板金３００の底壁３２０と略平行に配置される。放射器４００は、グランド板金３００の略中心に放射器４００の中心が重なるように配置され、複数のスペーサ４３０（図６）を介してグランド板金３００の底壁３２０に固定される。本実施形態においては、放射器４００は、３ヶ所に配置したスペーサ４３０を介して底壁３２０に固定される。スペーサ４３０は、放射器４００のアンテナ性能に影響を与えない樹脂製のものを用いた。 The radiator 400 is a substantially annular disk as shown in FIG. Radiator 400 includes two notches 410 (FIG. 4) at positions on the outer periphery thereof that face each other. In addition, by having the two notches 410, the radiator 400 can radiate circularly polarized waves. A surface on the front cover 110 side of the radiator 400 is a first surface 420, and a back surface thereof is a second surface 440. Radiator 400 is disposed substantially parallel to bottom wall 320 of ground sheet metal 300. Radiator 400 is disposed so that the center of radiator 400 overlaps the approximate center of ground metal plate 300, and is fixed to bottom wall 320 of ground metal plate 300 via a plurality of spacers 430 (FIG. 6). In the present embodiment, the radiator 400 is fixed to the bottom wall 320 via spacers 430 arranged at three locations. The spacer 430 is made of resin that does not affect the antenna performance of the radiator 400.
給電部材５００は、帯状の薄板形状を有している。給電部材５００は、図２に示すように、グランド板金３００の底壁３２０と放射器４００との間に配置される。給電部材５００の放射器４００側の面を第１面５３０とし、その裏側面を第２面５４０とする。給電部材５００は、放射器４００の外周の外側から中心へ向かって延び、放射器４００と給電部材５００の一部が重なる位置に配置される。 The power supply member 500 has a strip-like thin plate shape. The power feeding member 500 is disposed between the bottom wall 320 of the ground metal plate 300 and the radiator 400 as shown in FIG. The surface on the radiator 400 side of the power supply member 500 is a first surface 530 and the back side surface is a second surface 540. The power feeding member 500 extends from the outside of the outer periphery of the radiator 400 toward the center, and is disposed at a position where the radiator 400 and a part of the power feeding member 500 overlap each other.
すなわち給電部材５００は、グランド板金３００の内側において、グランド板金３００の一つの角から底壁３２０の対向する角に向かって延設される。そして、給電部材５００の長手方向の両端部は、グランド板金３００の底壁３２０にスペーサ５１０を介して、それぞれネジで固定される。 That is, the power feeding member 500 is extended from one corner of the ground metal plate 300 toward the opposite corner of the bottom wall 320 inside the ground metal plate 300. Then, both end portions in the longitudinal direction of the power supply member 500 are fixed to the bottom wall 320 of the ground metal plate 300 with screws through spacers 510, respectively.
また、給電部材５００は、第２面５４０の放射器４００の外周の外側に給電点５２０を有する。なお、給電点５２０は、ケーブル（図示せず）を介してＲＦＩＤタグ通信装置１の給電回路（図示せず）と接続され、給電部材５００に電力を供給する。そして、給電部材５００は、給電点５２０から給電された高周波信号により放射器４００を励振させる。 In addition, the power feeding member 500 has a power feeding point 520 outside the outer periphery of the radiator 400 on the second surface 540. The feeding point 520 is connected to a feeding circuit (not shown) of the RFID tag communication apparatus 1 via a cable (not shown), and supplies power to the feeding member 500. The power supply member 500 excites the radiator 400 by the high frequency signal supplied from the power supply point 520.
図３は、図２の切替手段６００を放射器４００側から見た斜視図である。切替手段６００は、操作アーム６１０と補填部材６５０と、を有する。 FIG. 3 is a perspective view of the switching unit 600 of FIG. 2 viewed from the radiator 400 side. The switching unit 600 includes an operation arm 610 and a compensation member 650.
操作アーム６１０は、把持部６２０と、連結部６２１と、第１アーム部６２２と、第２アーム部６２３と、を有する。操作アーム６１０は、例えば、一枚の樹脂製の板を抜き加工して形成されている。 The operation arm 610 includes a gripping part 620, a connecting part 621, a first arm part 622, and a second arm part 623. The operation arm 610 is formed, for example, by punching out a single resin plate.
把持部６２０は、連結部６２１の長手方向の中間位置から長手方向と直交する方向に延設されている。把持部６２０は、連結部６２１と繋がる部分と反対側の端部が前面カバー１１０の側壁から突出し、作業者が抜き刺し可能な長さを有する。 The grip portion 620 extends from the intermediate position in the longitudinal direction of the connecting portion 621 in a direction orthogonal to the longitudinal direction. The grip portion 620 has a length that allows the operator to insert and pierce the end portion on the opposite side of the portion connected to the connecting portion 621 from the side wall of the front cover 110.
また、連結部６２１の両端部には、把持部６２０と反対方向に延びる細長い帯状の第１アーム部６２２及び第２アーム部６２３が設けられている。第１アーム部６２２と第２アーム部６２３は、略平行に設けられている。 Further, at both ends of the connecting portion 621, elongated first strip-like arm portions 622 and second arm portions 623 extending in the opposite direction to the grip portion 620 are provided. The first arm part 622 and the second arm part 623 are provided substantially in parallel.
操作アーム６１０は、放射器４００から放射される放射波に影響を与えない絶縁部材、例えば、樹脂材料により形成される。 The operation arm 610 is formed of an insulating member that does not affect the radiation wave radiated from the radiator 400, for example, a resin material.
補填部材６５０は、連結部６２１から離間した第１アーム部６２２の先端の放射器４００側の面、及び、第２アーム部６２３の先端の放射器４００側の面に貼り付けられている。 The compensation member 650 is affixed to the surface on the radiator 400 side at the distal end of the first arm portion 622 spaced from the connecting portion 621 and the surface on the radiator 400 side in the distal end of the second arm portion 623.
補填部材６５０は、操作アーム６１０を第１位置に配置した状態で、放射器４００の切欠き４１０を覆う面積を有する。さらに詳しく言えば、補填部材６５０は、操作アーム６１０を第１位置に配置した状態で、補填部材６５０の周縁が、切欠き４１０の開口に重なり、放射器４００の外周縁と連続する。 The compensation member 650 has an area covering the notch 410 of the radiator 400 in a state where the operation arm 610 is disposed at the first position. More specifically, in the compensation member 650, the peripheral edge of the compensation member 650 overlaps the opening of the notch 410 and is continuous with the outer peripheral edge of the radiator 400 with the operation arm 610 disposed at the first position.
すなわち、補填部材６５０は、第１位置において、切欠き４１０の開口に重なり、放射器４００の外縁と連続する外辺６５１を有する。言い換えれば、外辺６５１は、切欠き４１０により断続された放射器４００の外縁をおぎなう。すなわち、補填部材６５０が切欠き４１０の全体を覆った場合に、補填部材６５０の外辺６５１が放射器４００の外周を繋ぐ。 That is, the filling member 650 has an outer side 651 that overlaps the opening of the notch 410 and is continuous with the outer edge of the radiator 400 at the first position. In other words, the outer edge 651 covers the outer edge of the radiator 400 that is interrupted by the notch 410. That is, when the compensation member 650 covers the entire cutout 410, the outer side 651 of the compensation member 650 connects the outer periphery of the radiator 400.
補填部材６５０は、放射器４００と同じように給電部材５００からの高周波信号により励振する材料により形成される。本実施形態においては、放射器４００と同じ材料を用いて作製した。 The compensation member 650 is formed of a material that is excited by a high-frequency signal from the power supply member 500 in the same manner as the radiator 400. In the present embodiment, the same material as that of the radiator 400 is used.
切替手段６００は、放射器４００の第１面４２０と対向して設けられ、把持部６２０の長手方向に沿って所定の幅でスライド可能に配置される。切替手段６００のスライド構造については、特に限定されないが、例えば、前面カバー１１０の裏面１１１に把持部６２０のスライドをガイドするレール部材（図示せず）を設け、レール部材に沿ってスライドするようにすることもできる。具体的には、操作アーム６１０は、補填部材６５０が切欠き４１０を覆う第１位置と、補填部材６５０が切欠き４１０から外れた第２位置との間で移動される。このとき補填部材は、放射器４００の第１面４２０に押しつけられ、第１面４２０に摺接する。操作アーム６１０を移動させる場合、例えば、作業者は、前面カバー１１０から突出している把持部６２０の基端を摘んで抜き挿しする。把持部６２０を引っ張ると補填部材６５０が第２位置に移動し、逆に把持部６２０を押し込むと補填部材６５０が第１位置に移動する。 The switching unit 600 is provided so as to face the first surface 420 of the radiator 400 and is slidably arranged with a predetermined width along the longitudinal direction of the grip portion 620. The slide structure of the switching unit 600 is not particularly limited. For example, a rail member (not shown) that guides the slide of the grip portion 620 is provided on the back surface 111 of the front cover 110, and slides along the rail member. You can also Specifically, the operation arm 610 is moved between a first position where the compensation member 650 covers the notch 410 and a second position where the compensation member 650 is removed from the notch 410. At this time, the compensation member is pressed against the first surface 420 of the radiator 400 and slidably contacts the first surface 420. When moving the operation arm 610, for example, the operator picks up and inserts the base end of the grip portion 620 protruding from the front cover 110. When the grip 620 is pulled, the compensation member 650 moves to the second position. Conversely, when the grip 620 is pushed in, the compensation member 650 moves to the first position.
次に、補填部材６５０の機能について図４、図５及び図６を用いて説明する。 Next, the function of the compensation member 650 will be described with reference to FIGS. 4, 5, and 6.
図４は、図２の切替手段６００を第２位置に配置した状態のアンテナ部２００を示す図である。図５は、図２の切替手段６００を第１位置に配置した状態のアンテナ部２００を示す図である。図６は、図５のアンテナ部２００をＦ６−Ｆ６で切断した断面図である。 FIG. 4 is a diagram showing the antenna unit 200 in a state where the switching unit 600 of FIG. 2 is arranged at the second position. FIG. 5 is a diagram showing the antenna unit 200 in a state where the switching unit 600 of FIG. 2 is arranged at the first position. FIG. 6 is a cross-sectional view of the antenna unit 200 of FIG. 5 taken along F6-F6.
図４に示すように、切欠き４１０を開放した状態で給電部材５００に給電がされると、パッチアンテナ１００は円偏波の電磁波を放射する。円偏波は、放射器４００の２つの切欠き４１０の内辺４１１の間の距離と、放射器４００の外縁部の直径との差により、２種類の周波数の電磁波が発生することにより放射される。 As shown in FIG. 4, when the power supply member 500 is supplied with the notch 410 opened, the patch antenna 100 radiates circularly polarized electromagnetic waves. Circularly polarized light is radiated by generating electromagnetic waves of two types of frequencies due to the difference between the distance between the inner sides 411 of the two notches 410 of the radiator 400 and the diameter of the outer edge of the radiator 400. The
一方、図４、５の矢印に沿って、操作アーム６１０を図示左方向に押し込むと、図５、図６に示すように、補填部材６５０は、放射器４００の第１面４２０と接触した状態で放射器４００に沿って移動し、切欠き４１０を覆う。これにより、補填部材６５０は、放射器４００と電気的に一体化し、あたかも切欠き４１０の設けられていない円環状の放射器のように振る舞う。つまり、切替手段６００を図５に示す位置（第１位置）に切替えた状態で給電部材５００に給電すると、本実施形態に係るパッチアンテナ１００は、直線偏波を放射する。上述したように、操作アーム６１０を第１位置に配置すると、図５，６に示すように、補填部材６５０の外辺６５１は、切欠き４１０の開口と重なる。 On the other hand, when the operation arm 610 is pushed in the left direction in the figure along the arrows in FIGS. 4 and 5, the compensation member 650 is in contact with the first surface 420 of the radiator 400 as shown in FIGS. 5 and 6. Moves along the radiator 400 and covers the notch 410. Thereby, the filling member 650 is electrically integrated with the radiator 400, and behaves as if it is an annular radiator without the notch 410. That is, when the power supply member 500 is fed with the switching unit 600 switched to the position (first position) shown in FIG. 5, the patch antenna 100 according to the present embodiment radiates linearly polarized waves. As described above, when the operation arm 610 is disposed at the first position, the outer side 651 of the compensation member 650 overlaps the opening of the notch 410 as shown in FIGS.
これにより、放射器４００の外縁の形状が円形に近似し、切欠き４１０が塞がれた状態で放射器から放射する電磁波の周波数を一つにでき、直線偏波を放射することができる。 Thereby, the shape of the outer edge of the radiator 400 approximates to a circle, and the frequency of the electromagnetic wave radiated from the radiator can be made one in a state where the notch 410 is closed, and linearly polarized waves can be emitted.
このように、本実施形態のパッチアンテナ１００によると、操作アーム６１０を２つの位置で切替えるだけで、放射する電磁波の種類を円偏波と直線偏波との間で簡単に切替ることができる。 As described above, according to the patch antenna 100 of the present embodiment, the type of the electromagnetic wave to be radiated can be easily switched between the circularly polarized wave and the linearly polarized wave by simply switching the operation arm 610 at two positions. .
このため、例えば、巨大な倉庫や工場のラインにおいて、規則正しく並べられている商品の同じ位置に同じ方向で付されたＲＦＩＤタグを読み取る場合には、操作アーム６１０を第１位置に切り替えて、通信距離を稼ぐことができる直線偏波を用いて商品情報を取得する。これにより、倉庫の全体を歩き回る必要がなく、効率よく作業をすることができる。 For this reason, for example, when reading RFID tags attached in the same direction to the same positions of regularly arranged products in a huge warehouse or factory line, the operation arm 610 is switched to the first position to perform communication. Product information is acquired using linearly polarized waves that can earn distance. Thereby, it is not necessary to walk around the whole warehouse, and work can be performed efficiently.
一方、小売店の店舗等における商品は、陳列方法も様々であるため、ＲＦＩＤタグの方向もバラバラである。このような状況におけるＲＦＩＤタグの読み取り作業に直線偏波モードを用いると、その偏波の方向とＲＦＩＤタグの方向が異なる商品が多くなるため、陳列棚に配置された商品の正確な商品情報を読み取ることができない虞がある。 On the other hand, since products in retail stores have various display methods, the direction of the RFID tag is also different. When the linearly polarized wave mode is used for the RFID tag reading operation in such a situation, the number of products having different polarization directions and RFID tag directions increases. Therefore, accurate product information of products placed on the display shelf can be obtained. There is a possibility that it cannot be read.
そこで、このような状況におけるＲＦＩＤタグの読み取り作業においては、操作アーム６１０を第２位置に切り替えて、円偏波を用いて商品情報を取得する。円偏波は、通信距離では、直線偏波には及ばない。しかしながら、ＲＦＩＤタグの位置や方向が異なるような状況であっても、商品情報を確実に読み取ることができる。これにより、店舗に陳列されている商品に付されているＲＦＩＤタグの方向を揃える必要がなく、効率よく作業をすることができる。 Therefore, in the RFID tag reading operation in such a situation, the operation arm 610 is switched to the second position, and product information is acquired using circularly polarized waves. Circular polarization does not reach linear polarization at the communication distance. However, even when the position and direction of the RFID tag are different, the product information can be reliably read. Thereby, it is not necessary to align the direction of the RFID tag attached to the merchandise displayed in the store, and work can be performed efficiently.
つまり、本実施形態によると、上述のような倉庫と店舗の両方で商品情報を取得するような作業が必要な場合においても、一台のＲＦＩＤタグ通信装置１で作業をすることができる。 In other words, according to the present embodiment, even when the work for obtaining the product information is required in both the warehouse and the store as described above, it is possible to work with a single RFID tag communication device 1.
また、本実施形態によると、直線偏波と円偏波を切り替えるための専用の部品の取り外しや取付け作業がないため、このような部品を紛失する虞もない。
これら新規な実施形態は、その他の様々な形態で実施されることが可能であり、発明の要旨を逸脱しない範囲で、種々の省略、置き換え、変更を行うことができる。これら実施形態やその変形は、発明の範囲や要旨に含まれるとともに、特許請求の範囲に記載された発明とその均等の範囲に含まれる。
In addition, according to the present embodiment, there is no need to remove or attach a dedicated component for switching between the linearly polarized wave and the circularly polarized wave.
These novel embodiments can be implemented in various other forms, and various omissions, replacements, and changes can be made without departing from the scope of the invention. These embodiments and modifications thereof are included in the scope and gist of the invention, and are included in the invention described in the claims and the equivalents thereof.
例えば、本実施形態では、円環状の放射器４００を例示したが、放射器の形状はこれに限らない。例えば、図７に示す放射器４００ａのように、正方形の放射器の対角線上の対向する２つの角を切り欠いた形状とすることもできる。この場合には、この２つの切欠き４１０ａを補填部材６５０で塞ぐことのできる切替手段（図示せず）を設けて、円偏波と直線偏波を切替できるようにしてもよい。
以下、本願の出願当初の特許請求の範囲に記載された発明を付記する。
［１］グランド板金と、
前記グランド板金に対向して配置され、円偏波を放射するための切欠きを有する放射器と、
前記グランド板金と前記放射器との間に設けられ、高周波信号を受けて前記放射器を励振させる給電部材と、
前記放射器を介して直線偏波を放射させるように前記切欠きに配置される補填部材と、
前記補填部材を前記切欠きの全体を覆う第１位置と前記切欠きから外れた第２位置との間で移動させ、前記放射器を介して放射する放射波を前記直線偏波又は前記円偏波に相互に切替える切替手段と、
を備えているアンテナ。
［２］前記切替手段は、
把持部と、
前記把持部から分岐する２つの第１アーム部及び第２アーム部と、を備えた操作アームを有し、
前記第１アーム部及び前記第２アーム部の先端に前記補填部材を設け、
前記操作アームが、前記放射器と対向してスライド可能に配置される［１］に記載のアンテナ。
［３］前記補填部材は、前記放射器と同じ材料で形成されている［１］または［２］に記載のアンテナ。
［４］前記補填部材を前記第１位置に配置した状態で、前記補填部材の周縁が、前記切欠きの開口に重なって、前記放射器の外周縁と連続する［１］乃至［３］のいずれか一つに記載のアンテナ。
［５］円偏波と直線偏波を相互に切り替えるアンテナの偏波切替方法であって、
前記アンテナは、グランド板金と、前記グランド板金に対向して配置される外縁部の相対する位置に２つの切欠きを有する放射器と、前記グランド板金と前記放射器との間に設けられ、前記放射器を励振させる給電部材と、を備え、
前記２つの切欠きを前記放射器と同じ材料により形成された補填部材で覆うことにより、前記円偏波から直線偏波に切り替えるアンテナの偏波切替方法。
［６］前記補填部材で覆われた前記２つの切欠きから、前記補填部材を外すことにより、前記直線偏波を前記円偏波へ切り替える［５］に記載のアンテナの偏波切替方法。
For example, in the present embodiment, the annular radiator 400 is illustrated, but the shape of the radiator is not limited thereto. For example, like the radiator 400a shown in FIG. 7, it can also be set as the shape which notched two corners on the diagonal of a square radiator. In this case, a switching means (not shown) that can block the two notches 410a with the compensation member 650 may be provided so that the circularly polarized wave and the linearly polarized wave can be switched.
Hereinafter, the invention described in the scope of claims at the beginning of the application of the present application will be added.
[1] Ground sheet metal,
A radiator disposed opposite to the ground sheet metal and having a notch for emitting circularly polarized waves;
A power supply member that is provided between the ground metal plate and the radiator and receives the high-frequency signal to excite the radiator;
A filling member disposed in the notch to radiate linearly polarized light through the radiator;
The compensation member is moved between a first position covering the whole of the notch and a second position deviating from the notch, and the radiated wave radiated through the radiator is changed to the linearly polarized wave or the circularly polarized wave. Switching means for mutually switching to waves,
With an antenna.
[2] The switching means includes
A gripping part;
An operation arm comprising two first arm portions and a second arm portion branched from the gripping portion;
The compensation member is provided at the tip of the first arm part and the second arm part,
The antenna according to [1], wherein the operation arm is slidably disposed so as to face the radiator.
[3] The antenna according to [1] or [2], wherein the compensation member is formed of the same material as the radiator.
[4] In the state where the compensation member is arranged at the first position, the peripheral edge of the supplementary member overlaps the opening of the notch and is continuous with the outer peripheral edge of the radiator. The antenna as described in any one.
[5] An antenna polarization switching method for switching between circular polarization and linear polarization,
The antenna is provided between a ground sheet metal, a radiator having two notches at opposite positions of an outer edge portion disposed to face the ground sheet metal, and the ground sheet metal and the radiator, A power supply member for exciting the radiator,
An antenna polarization switching method for switching from the circularly polarized wave to the linearly polarized wave by covering the two notches with a compensation member made of the same material as the radiator.
[6] The antenna polarization switching method according to [5], wherein the linearly polarized wave is switched to the circularly polarized wave by removing the compensating member from the two notches covered with the compensating member.
１…ＲＦＩＤタグ通信装置、２…ハンドル、３…クリップ、２１…肩部、３１…爪、１００…パッチアンテナ、１１０…前面カバー、１１１…裏面、１２０…背面カバー、２００…アンテナ部、３００…グランド板金、３１０…側壁、３２０…底壁、３３０…開口部、４００…放射器、４００ａ…放射器、４１０…切欠き、４１０ａ…切欠き、４２０…第１面、４３０…スペーサ、４４０…第２面、４５０…外周縁、５００…給電部材、５１０…スペーサ、５２０…給電点、５３０…第１面、５４０…第２面、６００…切替手段、６１０…操作アーム、６２０…把持部、６２１…連結部、６２２…第１アーム部、６２３…第２アーム部、６５０…補填部材。 DESCRIPTION OF SYMBOLS 1 ... RFID tag communication apparatus, 2 ... Handle, 3 ... Clip, 21 ... Shoulder part, 31 ... Claw, 100 ... Patch antenna, 110 ... Front cover, 111 ... Back surface, 120 ... Back cover, 200 ... Antenna part, 300 ... Ground sheet metal 310 ... Side wall 320 ... Bottom wall 330 ... Opening 400 ... Radiator 400a ... Radiator 410 ... Notch 410a ... Notch 420 ... First surface 430 ... Spacer 440 ... First Two surfaces, 450 ... outer peripheral edge, 500 ... power feeding member, 510 ... spacer, 520 ... power feeding point, 530 ... first surface, 540 ... second surface, 600 ... switching means, 610 ... operating arm, 620 ... gripping part, 621 ... Connection part, 622 ... 1st arm part, 623 ... 2nd arm part, 650 ... Compensation member.
Claims (5)
高周波信号を受けて前記放射器を励振させる給電部材と、
前記切欠きの全体を覆うように前記切欠きに配置されるとともに、前記高周波信号を受けて前記放射器とともに励振する材料により形成される補填部材と、
前記補填部材に設けられ、前記切欠きの全体を覆う第１位置と前記切欠きから外れた第２位置との間で前記補填部材の位置を切替える切替手段と、
を備えているアンテナ。 A radiator having notches at positions opposite to each other with respect to the center ;
A power supply member that receives a high-frequency signal and excites the radiator;
A filling member formed of a material that is arranged in the notch so as to cover the entire notch and receives the high-frequency signal and is excited with the radiator ;
Switching means provided on the compensation member for switching the position of the compensation member between a first position covering the whole of the notch and a second position deviating from the notch;
With an antenna.
把持部と、
前記把持部から分岐する２つの第１アーム部及び第２アーム部と、を備えた操作アームを有し、
前記第１アーム部及び前記第２アーム部の先端に前記補填部材を設け、
前記操作アームが、前記放射器と対向してスライド可能に配置される請求項１に記載のアンテナ。 The switching means is
A gripping part;
An operation arm comprising two first arm portions and a second arm portion branched from the gripping portion;
The compensation member is provided at the tip of the first arm part and the second arm part,
The antenna according to claim 1, wherein the operating arm is slidably disposed so as to face the radiator.
前記補填部材の配置を前記切欠きの全体を覆う第１位置と前記切欠きから外れた第２位置との間で切替えることで、円偏波と直線偏波とを相互に切り替えるアンテナの偏波切替方法。 Wherein a radiator having a notch at opposite positions to each other with respect to the center, and the power supply member for exciting said radiator receives a high-frequency signal, wherein while being disposed in the notch so as covering the entire notch A supplementary member formed of a material that receives a high-frequency signal and excites with the radiator ,
Polarization of an antenna that switches between circularly polarized waves and linearly polarized waves by switching the arrangement of the compensating member between a first position that covers the entire notch and a second position that is off the notch. Switching method.
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