JP6475661B2 - Plate-like inverted F antenna and wireless communication apparatus including the same - Google Patents
Plate-like inverted F antenna and wireless communication apparatus including the same Download PDFInfo
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- 238000005452 bending Methods 0.000 claims description 4
- 230000010287 polarization Effects 0.000 description 6
- 230000005855 radiation Effects 0.000 description 4
- 229910052751 metal Inorganic materials 0.000 description 3
- 239000002184 metal Substances 0.000 description 3
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 1
- 229910052782 aluminium Inorganic materials 0.000 description 1
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 1
- 229910052802 copper Inorganic materials 0.000 description 1
- 239000010949 copper Substances 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
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Description
本発明は、板状逆Ｆアンテナ及びこれを具えた無線通信装置に関するものであり、より具体的には、小型化及びアンテナ指向性の向上を図ることのできる板状逆Ｆアンテナ及びこれを具えた無線通信装置に関するものである。 The present invention relates to a plate-like inverted F antenna and a wireless communication apparatus including the same, and more specifically, a plate-like inverted F antenna capable of reducing the size and improving the antenna directivity, and the same. The present invention relates to a wireless communication apparatus.
スマートフォンや携帯電話機、ＰＤＡ（Personal Digital Assistant）などの携帯型電子機器には無線通信装置が内蔵されている。また、エアコン、ファンヒーター、コンロなどの電気製品にも無線通信装置を内蔵したものが提案されている。 A portable electronic device such as a smartphone, a mobile phone, or a PDA (Personal Digital Assistant) has a built-in wireless communication device. In addition, electric appliances such as air conditioners, fan heaters, stoves, and the like that have built-in wireless communication devices have been proposed.
この種の無線通信装置に用いられるアンテナとして、板状逆Ｆアンテナ（ＰＩＦＡ：Planar Inverted F Antenna）が知られている（たとえば、特許文献１参照）。板状逆Ｆアンテナは、長辺Ｌと短辺Ｗとを有する矩形の平面形状を有する放射体と、放射体の短辺に給電部、長辺側に短絡部を有する。矩形の板状逆Ｆアンテナの電流経路長Ｃは、放射体の長辺Ｌと短辺Ｗの和、すなわち、Ｃ＝Ｌ＋Ｗで表わされ、この電流経路長Ｃが共振周波数λ／４となるよう設計される。 A plate-like inverted F antenna (PIFA) is known as an antenna used in this type of wireless communication apparatus (see, for example, Patent Document 1). The plate-like inverted F antenna includes a radiator having a rectangular planar shape having a long side L and a short side W, a feeding portion on the short side of the radiator, and a short-circuit portion on the long side. The current path length C of the rectangular plate-like inverted F antenna is represented by the sum of the long side L and the short side W of the radiator, that is, C = L + W, and this current path length C becomes the resonance frequency λ / 4. Designed as
無線通信装置を搭載する機器の小型化に伴い、無線通信装置にも同様の小型化が求められている。しかしながら、板状逆Ｆアンテナは、放射体が矩形であるため、その設置面積が大きくなり小型化が困難であった。 Along with the downsizing of devices equipped with wireless communication devices, similar downsizing is required for wireless communication devices. However, since the plate-shaped inverted F antenna has a rectangular radiator, its installation area is large and it is difficult to reduce the size.
本発明の目的は、小型化及びアンテナ指向性の向上を図ることのできる板状逆Ｆアンテナ及びこれを具えた無線通信装置を提供することである。 An object of the present invention is to provide a plate-like inverted-F antenna that can be reduced in size and improved in antenna directivity, and a wireless communication device including the same.
上記課題を解決するために、本発明の板状逆Ｆアンテナは、
板状の放射体と、前記放射体の側縁に給電部及び短絡部を具える板状逆Ｆアンテナであって、
前記放射体は、板状であって平面内で屈曲した少なくとも１の屈曲部を有する。
In order to solve the above problems, the plate-like inverted F antenna of the present invention is
A plate-like radiator, and a plate-like inverted F antenna comprising a feeding portion and a short-circuit portion on a side edge of the radiator,
The radiator has a plate shape and has at least one bent portion bent in a plane.
前記放射体は、２の屈曲部を有することが望ましい。 The radiator preferably has two bent portions.
前記放射体は、略コ字状形状であり、略平行に延びる平行辺の一方の先端に前記給電部、前記給電部の形成された前記平行辺の側縁に前記短絡部を具えることが望ましい。 The radiator is substantially U-shaped, and includes the power feeding portion at one end of a parallel side extending substantially in parallel, and the short-circuit portion at a side edge of the parallel side where the power feeding portion is formed. desirable.
また、本発明の無線通信装置は、
上記記載の板状逆Ｆアンテナを具える無線通信装置であって、
通信用の回路基板の給電端子に前記板状逆Ｆアンテナの前記給電部、前記回路基板のグランド端子に前記板状逆Ｆアンテナの前記短絡部を接続してなる。
The wireless communication device of the present invention
A wireless communication device comprising the plate-like inverted F antenna described above,
The power feeding portion of the plate-like inverted F antenna is connected to a power feeding terminal of a circuit board for communication, and the short-circuit portion of the plate-like inverted F antenna is connected to a ground terminal of the circuit board.
本発明に係る板状逆Ｆアンテナは、放射体に平面内で屈曲する屈曲部を形成したことで、一方の端部から他方の端部に至る電流経路長Ｃを長く採ることができる。この電流経路長の４倍の波長（λ）が共振周波数となるから、放射体が矩形形状（Ｗ＋Ｌ）の場合に比べて放射体を小さくすることができ、板状逆Ｆアンテナの小型化を図ることができる。 The plate-like inverted F antenna according to the present invention can have a long current path length C from one end to the other end by forming a bent portion that is bent in a plane on the radiator. Since the wavelength (λ) four times the current path length is the resonance frequency, the radiator can be made smaller than when the radiator is rectangular (W + L), and the plate-like inverted F antenna can be downsized. Can be planned.
本発明に係る板状逆Ｆアンテナを具えた無線通信装置は、板状逆Ｆアンテナの小型化を達成できるから、スマートフォンや携帯電話機、ＰＤＡなどの携帯型電子機器には無線通信装置、エアコン、ファンヒーター、コンロなどの電気製品の小型化にも対応できる。 Since the wireless communication device including the plate-like inverted F antenna according to the present invention can achieve downsizing of the plate-like inverted F antenna, portable electronic devices such as smartphones, mobile phones, and PDAs include wireless communication devices, air conditioners, It can cope with downsizing of electric products such as fan heater and stove.
以下、本発明の一実施形態に係る板状逆Ｆアンテナ１０について、図面を参照しながら説明を行なう。 Hereinafter, a plate-like inverted F antenna 10 according to an embodiment of the present invention will be described with reference to the drawings.
図１は、本発明の一実施形態に係る板状逆Ｆアンテナ１０の斜視図、図２は平面図である。図に示すように、板状逆Ｆアンテナ１０は、放射体２０、給電部３０及び短絡部４０を具える。放射体２０は、導電性の薄金属板、たとえば、銅板やアルミニウム板などから構成することができる。また、回路基板にプリントしても構わない。図示の実施形態では、板状逆Ｆアンテナ１０は、１枚の薄金属板から放射体２０、給電部３０及び短絡部４０を打ち抜き、給電部３０と短絡部４０を放射体２０に対して同方向に略垂直に屈曲して作成している。 FIG. 1 is a perspective view of a plate-like inverted F antenna 10 according to an embodiment of the present invention, and FIG. 2 is a plan view. As shown in the figure, the plate-like inverted F antenna 10 includes a radiator 20, a power feeding unit 30, and a short-circuit unit 40. The radiator 20 can be composed of a conductive thin metal plate such as a copper plate or an aluminum plate. Moreover, you may print on a circuit board. In the illustrated embodiment, the plate-like inverted F antenna 10 is formed by punching the radiator 20, the power feeding unit 30, and the short-circuit unit 40 from one thin metal plate, and the power feeding unit 30 and the short-circuit unit 40 are the same with respect to the radiator 20. It is created by bending substantially perpendicular to the direction.
放射体２０は、その平面内で屈曲した少なくとも１の屈曲部２１を有する。図１及び図２では、屈曲部２１，２１は２つであり、放射体２０は平面視略コ字状である。放射体２０は、薄金属板にスリット２５を形成し、スリット２５を挟んで略平行に延びる平行辺２２，２３とスリット２５の端部に位置し、平行辺２２，２３どうしを結ぶ繋ぎ辺２４を具える。 The radiator 20 has at least one bent portion 21 bent in the plane thereof. In FIG.1 and FIG.2, the bending parts 21 and 21 are two, and the radiator 20 is planar shape substantially U shape. The radiator 20 has a slit 25 formed in a thin metal plate, is located at the end of the slit 25 and the parallel sides 22 and 23 extending substantially in parallel with the slit 25 therebetween, and a connecting side 24 connecting the parallel sides 22 and 23. With
放射体２０に屈曲部２１を形成することで、後述するとおり、放射体２０を流れる電流を放射体２０に沿って蛇行させることができるため、電流経路長Ｃを長く採ることができる。従って、放射体が矩形の場合に比べて、同じ電流経路長Ｃ（共振周波数λ／４）を小面積で実現することができ、板状逆Ｆアンテナ１０の小型化を達成できる。 By forming the bent portion 21 in the radiator 20, as will be described later, the current flowing through the radiator 20 can be caused to meander along the radiator 20, so that the current path length C can be increased. Therefore, compared with the case where the radiator is rectangular, the same current path length C (resonance frequency λ / 4) can be realized in a small area, and the plate-like inverted F antenna 10 can be reduced in size.
給電部３０は、一方の平行辺２２の先端に設けることができる。図示の実施形態では、給電部３０は、平行辺２２の先端のスリット２５側に設けている。給電部３０を放射体２０の内側に近い位置に設けることで、無線通信装置に実装される他の回路とのショートを防ぐことができ、回路設計上の自由度を高めることができる。 The power feeding unit 30 can be provided at the tip of one parallel side 22. In the illustrated embodiment, the power feeding unit 30 is provided on the slit 25 side of the tip of the parallel side 22. By providing the power feeding unit 30 at a position close to the inside of the radiator 20, a short circuit with another circuit mounted on the wireless communication device can be prevented, and the degree of freedom in circuit design can be increased.
短絡部４０は、給電部３０の形成された平行辺２２の側縁に設けることができる。図示では、短絡部４０は、スリット２５とは逆側の外側側縁に設けている。 The short-circuit part 40 can be provided on the side edge of the parallel side 22 where the power feeding part 30 is formed. In the drawing, the short-circuit portion 40 is provided on the outer side edge opposite to the slit 25.
一実施形態として、板状逆Ｆアンテナ１０は、図２に示すように、平行辺２２の長さは２５．５ｍｍ（Ｌ１）、幅は７ｍｍ（Ｗ１）、平行辺２３の長さは２５．５ｍｍ（Ｌ２）、幅は１５ｍｍ（Ｗ２）、繋ぎ辺２４の長さは３５ｍｍ（Ｌ３）、幅は７ｍｍ（Ｗ３）である。また、放射体２０の厚さは０．３ｍｍである。なお、寸法はこれに限定されるものではなく、たとえば、平行辺２２，２３は同一寸法ではなく、長さや幅を互いに異なるものにしても構わない。 As an embodiment, as shown in FIG. 2, the plate-like inverted F antenna 10 has a parallel side 22 having a length of 25.5 mm (L 1 ), a width of 7 mm (W 1 ), and a parallel side 23 having a length of 25.5 mm (L 2 ), the width is 15 mm (W 2 ), the length of the connecting side 24 is 35 mm (L 3 ), and the width is 7 mm (W 3 ). The thickness of the radiator 20 is 0.3 mm. In addition, a dimension is not limited to this, For example, the parallel sides 22 and 23 are not the same dimension, You may make a mutually different length and width | variety.
放射体２０の電流経路長Ｃは、図２に示すように、放射体２０の平行辺２２，２３、繋ぎ辺２４の幅方向略中央をとおる経路となるから、
Ｃ＝（Ｌ１＋Ｗ３／２）＋（Ｌ２＋Ｗ３／２）＋（Ｌ３−（Ｗ１＋Ｗ２）／２）
＝Ｌ１＋Ｌ２＋Ｌ３−（Ｗ１＋Ｗ２）／２＋Ｗ３
で表わされる。この電流経路長Ｃを矩形の放射体で実現するには、外形寸法が約１．５倍大きい放射体を必要とする。すなわち、同じ電流経路長Ｃを達成するために、本発明の板状逆Ｆアンテナ１０は、放射体２０の外形を約３３％小型化できる。なお、上記式より、平行辺２２，２３の幅Ｗ１，Ｗ２を狭くすることで、より長い電流経路長Ｃを確保できることがわかる。
As shown in FIG. 2, the current path length C of the radiator 20 is a path that passes through substantially the center in the width direction of the parallel sides 22 and 23 of the radiator 20 and the connecting side 24.
C = (L 1 + W 3 /2) + (L 2 + W 3/2) + (L 3 - (W 1 + W 2) / 2)
= L 1 + L 2 + L 3 − (W 1 + W 2 ) / 2 + W 3
It is represented by In order to realize this current path length C with a rectangular radiator, a radiator having an outer dimension approximately 1.5 times larger is required. That is, in order to achieve the same current path length C, the plate-like inverted F antenna 10 of the present invention can reduce the outer shape of the radiator 20 by about 33%. From the above formula, it can be seen that a longer current path length C can be secured by narrowing the widths W 1 and W 2 of the parallel sides 22 and 23.
より詳細には、Ｌ１及びＬ２：１８ｍｍ〜３３ｍｍ、Ｌ３：３０ｍｍ〜４０ｍｍ、Ｗ１及びＷ２：５ｍｍ〜１５ｍｍ、Ｗ３：５ｍｍ〜１０ｍｍとすることが望ましい。もちろん、これら寸法は、希望する周波数帯域に応じた電流経路長Ｃによって決定することができる。 More specifically, it is desirable that L 1 and L 2 are 18 mm to 33 mm, L 3 is 30 mm to 40 mm, W 1 and W 2 are 5 mm to 15 mm, and W 3 is 5 mm to 10 mm. Of course, these dimensions can be determined by the current path length C corresponding to the desired frequency band.
給電部３０と短絡部４０との距離Ｌ４は、周波数帯域に応じて調整することができる。Ｌ４が長くなるほど低周波数帯域に対応し、Ｌ４が短いほど高周波数帯域に対応できる。 Distance L 4 between the power supply unit 30 and the short-circuit unit 40 can be adjusted in accordance with the frequency band. The longer L 4 corresponds to the low frequency band, and the shorter L 4 corresponds to the high frequency band.
本発明の板状逆Ｆアンテナ１０は、無線通信装置の回路基板に接続される。具体的には、給電部３０が信号を供給する給電端子に接続され、短絡部４０はグランド端子に接続される。本発明の板状逆Ｆアンテナ１０は小型化を達成できるから、無線通信装置の小型化も達成することができる。 The plate-like inverted F antenna 10 of the present invention is connected to a circuit board of a wireless communication device. Specifically, the power supply unit 30 is connected to a power supply terminal that supplies a signal, and the short circuit unit 40 is connected to a ground terminal. Since the plate-like inverted F antenna 10 of the present invention can be miniaturized, the radio communication device can also be miniaturized.
上記した板状逆Ｆアンテナ１０のアンテナ特性と放射指向性について、図３及び図４を参照して説明する。 The antenna characteristics and radiation directivity of the plate-like inverted F antenna 10 will be described with reference to FIGS.
図３は、本発明の板状逆Ｆアンテナ１０のＶＳＷＲ（Voltage-Standing Wave Ratio：電圧定在波比）特性を示している。図３中、横軸は周波数、縦軸はＶＳＷＲである。図３を参照すると、本発明の板状逆Ｆアンテナ１０は、周波数が９２４ＭＨｚの点で最も効率がよく、ＶＳＷＲが２以下となる周波数帯域は９２０から９２８ＭＨｚとなっている。 FIG. 3 shows VSWR (Voltage-Standing Wave Ratio) characteristics of the plate-like inverted F antenna 10 of the present invention. In FIG. 3, the horizontal axis represents frequency, and the vertical axis represents VSWR. Referring to FIG. 3, the plate-like inverted F antenna 10 of the present invention is most efficient at a frequency of 924 MHz, and the frequency band where VSWR is 2 or less is 920 to 928 MHz.
また、図４は、周波数９２４．４ＭＨｚにおけるＨ−Ｙ平面、Ｙ−Ｚ平面、Ｚ−Ｘ平面の指向性を示している。図を参照すると、本発明の板状逆Ｆアンテナ１０は、水平偏波と垂直偏波共に利得が取れている。 FIG. 4 shows the directivity of the HY plane, the YZ plane, and the ZX plane at a frequency of 924.4 MHz. Referring to the figure, the plate-like inverted F antenna 10 of the present invention has gains in both horizontal polarization and vertical polarization.
すなわち、本発明の板状逆Ｆアンテナ１０は、広い周波数帯域特性を有し、全方位の直線偏波に対応でき、矩形放射体に比して小型化されたアンテナであることがわかる。 That is, it can be seen that the plate-like inverted F antenna 10 of the present invention has a wide frequency band characteristic, can cope with omnidirectional linearly polarized waves, and is an antenna that is smaller than a rectangular radiator.
上記実施例の説明は、本発明を説明するためのものであって、特許請求の範囲に記載の発明を限定し、或は範囲を減縮する様に解すべきではない。又、本発明の各部構成は上記実施例に限らず、特許請求の範囲に記載の技術的範囲内で種々の変形が可能であることは勿論である。 The above description of the embodiments is for explaining the present invention, and should not be construed as limiting the invention described in the claims or reducing the scope thereof. In addition, the configuration of each part of the present invention is not limited to the above embodiment, and various modifications can be made within the technical scope described in the claims.
図５は、本発明の板状逆Ｆアンテナ１０の放射体２０の形状の異なる実施形態である。（ａ）は屈曲部２１が１つの平面視略Ｌ字状の放射体２０、（ｂ）は屈曲部２１が３つの平面視略ロ字状の放射体２０である。何れの場合も、放射体２０に屈曲部２１を設けたことにより、矩形の放射体に比べて放射体２０の面積を小さくしつつ、長い電流経路長Ｃを確保できる。 FIG. 5 is an embodiment in which the shape of the radiator 20 of the plate-like inverted F antenna 10 of the present invention is different. (A) is a radiator 20 with one bent portion 21 having a substantially L shape in plan view, and (b) is a radiator 20 with substantially bent portions 21 having a bent portion 21 in plan view. In any case, by providing the radiator 20 with the bent portion 21, it is possible to secure a long current path length C while reducing the area of the radiator 20 compared to the rectangular radiator.
また、図５（ａ）に示した略Ｌ字状の板状逆Ｆアンテナ１０の放射指向性も、垂直偏波と水平偏波が混在し、図４と同等の指向性が見込まれる。なお、略Ｌ字状の板状逆Ｆアンテナ１０は、屈曲部２１が１つであるから、略コ字状の板状逆Ｆアンテナと同じ電流経路長Ｃを確保するには、略コ字状の板状逆Ｆアンテナに比べて大型化してしまうことがある。 Further, the radiation directivity of the substantially L-shaped plate-shaped inverted F antenna 10 shown in FIG. 5A is also mixed with vertical polarization and horizontal polarization, and the directivity equivalent to FIG. 4 is expected. Since the substantially L-shaped plate-shaped inverted F antenna 10 has one bent portion 21, in order to ensure the same current path length C as the substantially U-shaped plate-shaped inverted F antenna, the substantially U-shaped The size may be increased as compared to a plate-like inverted F antenna.
同様に、図５（ｂ）に示した略ロ字状の板状逆Ｆアンテナ１０の放射指向性も、垂直偏波と水平偏波が混在し、図４と同等の指向性が見込まれる。略ロ字状の板状逆Ｆアンテナ１０は、屈曲部２１が３つあり、屈曲部が２つの略コ字状の板状逆Ｆアンテナに比べて同じ電流経路長Ｃを、さらに小型の形態で確保できる。 Similarly, as for the radiation directivity of the substantially rectangular plate-shaped inverted F antenna 10 shown in FIG. 5B, vertical polarization and horizontal polarization are mixed, and the directivity equivalent to FIG. 4 is expected. The substantially inverted-L plate-shaped inverted F antenna 10 has three bent portions 21, and has the same current path length C as that of the approximately U-shaped plate-shaped inverted F antenna having two bent portions. Can be secured.
１０ 板状逆Ｆアンテナ
２０ 放射体
２１ 屈曲部
２２ 平行辺
２３ 平行辺
２４ 繋ぎ辺
３０ 給電部
４０ 短絡部
Ｃ 電流経路長
DESCRIPTION OF SYMBOLS 10 Plate-shaped inverted F antenna 20 Radiator 21 Bending part 22 Parallel side 23 Parallel side 24 Connecting side 30 Feed part 40 Short-circuit part C Current path length
Claims (6)
前記放射体は、板状であって平面内で屈曲した屈曲部を有する略コ字状形状であり、略平行に延びる平行辺は、幅が異なる、
板状逆Ｆアンテナ。 A plate-like radiator, and a plate-like inverted F antenna comprising a feeding portion and a short-circuit portion at an edge of the radiator,
The radiator is a substantially U-shape having a bending curve portion which a plate-like bent in a plane, parallel sides extending substantially parallel, have different widths,
Plate-shaped inverted F antenna.
請求項１に記載の板状逆Ｆアンテナ。 The feeding portion is provided at an end edge, and the short circuit portion is provided at a side edge extending from the end edge.
The plate-like inverted F antenna according to claim 1.
前記放射体は、板状であって平面内で屈曲した少なくとも１の屈曲部を有し、
端縁に前記給電部を具え、前記端縁から延びる側縁に前記短絡部を具える、
板状逆Ｆアンテナ。 A plate-like radiator, and a plate-like inverted F antenna comprising a feeding portion and a short-circuit portion on the radiator,
The radiator has a plate shape and has at least one bent portion bent in a plane;
The feeding portion is provided at an end edge, and the short circuit portion is provided at a side edge extending from the end edge.
Plate-shaped inverted F antenna.
請求項１乃至請求項３の何れかに記載の板状逆Ｆアンテナ。 The radiator has two bends;
The plate-like inverted F antenna according to any one of claims 1 to 3 .
請求項４に記載の板状逆Ｆアンテナ。 The radiator is substantially U-shaped,
The plate-like inverted F antenna according to claim 4 .
通信用の回路基板の給電端子に前記板状逆Ｆアンテナの前記給電部、前記回路基板のグランド端子に前記板状逆Ｆアンテナの前記短絡部を接続してなる、
無線通信装置。 A wireless communication device comprising the plate-like inverted F antenna according to any one of claims 1 to 5 ,
The power feeding part of the plate-like inverted F antenna is connected to the power feeding terminal of the circuit board for communication, and the shorting part of the plate-like inverted F antenna is connected to the ground terminal of the circuit board.
Wireless communication device.
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