JP2003078336A - Laminated spiral antenna - Google Patents

Laminated spiral antenna

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JP2003078336A
JP2003078336A JP2001262492A JP2001262492A JP2003078336A JP 2003078336 A JP2003078336 A JP 2003078336A JP 2001262492 A JP2001262492 A JP 2001262492A JP 2001262492 A JP2001262492 A JP 2001262492A JP 2003078336 A JP2003078336 A JP 2003078336A
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spiral
upper
antenna
planar substrate
formed
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Shigeo Kawasaki
繁男 川崎
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Tokai Univ
学校法人東海大学
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Abstract

PROBLEM TO BE SOLVED: To comparatively widen directivity, especially to increase gains. SOLUTION: A laminated spiral antenna consists of a lowermost layer spiral 1 which is formed by etching processing, etc., on a planar substrate 10 made of a dielectric slab, and an upper layer spiral 2 which is positioned one stage higher than an outer circumferential side end of the spiral 1, is directed toward a radiating direction from this position, and is formed on an upper planar substrate 11 made of the material identical to that of the substrate 10. The spirals 1 and 2 are continuously connected and have a plurality of arms respectively.

Description

【発明の詳細な説明】 【0001】 【産業上の利用分野】本発明は、指向性が比較的広いのみならず、利得を高くできる積層スパイラルアンテナに関する。 BACKGROUND OF THE INVENTION [0001] FIELD OF THE INVENTION The present invention is not only a relatively wide directivity, a laminated spiral antenna which can increase the gain. 【0002】 【従来の技術】近年、マイクロ波帯,ミリ波帯等の電磁波を利用した情報通信システムが世界的に提唱され、特に、マイクロ波を用いた情報通信の需要が高まっている。 [0002] In recent years, microwave band, an information communication system using an electromagnetic wave such as a millimeter wave band is proposed worldwide, in particular, demands for information communication using microwaves. 【0003】その中で航空、衛星システムなどの移動する通信機器に生じる送受信アンテナの偏波損失の改善は、重要な課題となっている。 [0003] Air in the improvement of the polarization loss of the mobile transmitting and receiving antenna that occurs in the communication equipment to such as satellite systems, has become an important issue. そこで解決策として円偏波を利用したアンテナを用いることが盛んに研究開発されている。 So is the use of the antenna using a circularly polarized wave has been studied and developed actively as a solution. さらに構造が簡単で、これらの要求を満足するためのアンテナとして、スパイラルアンテナが存在している。 Moreover the structure is simple, as the antenna for satisfying these requirements, spiral antenna are present. 【0004】従来のプリント型スパイラルアンテナの構造は誘電体基板上にスパイラルアンテナがプリントされた平面型スパイラルアンテナである。 [0004] structure of the conventional printed type spiral antenna is a planar spiral antenna spiral antenna is printed on a dielectric substrate. 具体的には、図5 Specifically, FIG. 5
に示すプリント型アルキメデススパイラルアンテナである。 A printed type Archimedean spiral antenna shown in. 該アルキメデススパイラルアンテナとは線路幅、線路間隔が一定のスパイラルアンテナのことである。 The said Archimedean spiral antenna is that the line width, the line spacing of the fixed spiral antenna. このスパイラルアンテナから円偏波を放射させるためには、 To emit circularly polarized waves from the spiral antenna,
給電点からアームの末端に向かう進行波電流を確立しなければならないし、進行波電流を確立して円偏波を放射するためには1波長以上の外周が必要である。 It must be established traveling wave current flowing from the feeding point to the end of the arm, in order to radiate circularly polarized waves to establish a traveling wave current is required the outer circumference of more than one wavelength. スパイラルアンテナへの給電はアームの内端部より行い、給電する際には各アームに入る信号の位相を 180°ずらさなければならない。 Power supply to the spiral antenna is performed from the inner end portion of the arm must be shifted 180 ° the phase of the signal entering each arm when feeding. すなわち、平衡給電を行わなければならない。 In other words, it must be performed balanced feed. 【0005】この平面型スパイラルアンテナの最大の利点は広帯域であり、指向性が広く、サイドローブが無いことである。 [0005] The greatest advantage of this flat spiral antenna is a broadband, wide directivity, is that the side lobe is not. しかし利得が低く、約2[dBi]程である。 But the gain is low, is approximately 2 [dBi]. この従来技術としての基本特性を調べてみた。 The conventional examined the basic characteristics as a technology. この測定距離は1.5mとし、測定する際にはY−Z平面をE面とし、X−Z平面をH面とした。 The measured distance is the 1.5 m, when measured by an E plane Y-Z plane, the X-Z plane and the H plane. この時の測定結果及びシミュレーション結果をE面アンテナパターンとして図6 Figure measurement results and simulation results of this as E-plane antenna pattern 6
に示した。 It was shown to. シミュレーションは市販のシミュレータである高周波電磁界シミュレータ(HFSS)を使用した。 Simulation was used a high-frequency electromagnetic field simulator (HFSS) is a commercially available simulator. これによりシミュレーション値と測定結果はアンテナの半値幅において良好な結果を得ることができた。 Thus simulation value and the measured results could be obtained good results in the half-width of the antenna. アンテナの半値幅は80°となり、アンテナ利得は1.4[dBi]得ることができた。 Half-value width 80 ° next to the antenna, antenna gain was obtained 1.4 [dBi]. また正面での軸比は1.4[dB] となり、円偏波アンテナとして動作していることが判る。 The axial ratio of the front is 1.4 [dB], and the it can be seen that operates as a circularly polarized antenna. 【0006】 【発明が解決しようとする課題】以上のように、スパイラルアンテナには指向性は広い特性があるが、利得が低くなるという欠点があり、かかる利得を向上させるような改善、改良の問題を解決する具体的手段の提供が期待されていた。 [0006] As described above [0008], although the spiral antenna has directivity broad characteristics, has the disadvantage gain is low, improvements to enhance such gain, improved providing specific means for solving the problem has been expected. 【0007】 【課題を解決するための手段】そこで発明者は、鋭意研究を重ねた結果、その発明を、誘電体スラブからなる平面基板上にエッチング処理等にて形成された最下層スパイラルと、該最下層スパイラルの外周側端より一段上側に位置し、該位置より放射方向に向かい、且つ前記平面基板と同材質の上層平面基板に形成された上層スパイラルとからなり、前記最下層スパイラルと上層スパイラルとは連続接続され、且つそれぞれのアーム数を複数としてなる積層スパイラルアンテナ等としたことにより、利得の改善を飛躍的に向上させることができ、前記課題を解決したものである。 [0007] Means for Solving the Problems] Therefore, the inventors have, as a result of extensive studies, the present invention, the lowermost spiral formed by etching or the like to planar substrate formed of a dielectric slab, located above one step from the outer peripheral side edge of the outermost lower spiral, towards the radial direction from the position and consists of a the planar substrate and the upper layer spiral formed in an upper layer planar substrate made of the same material, the lowermost layer spiral and the upper layer the spiral is continuous connected, by and respectively of the number of arms has a stacked spiral antenna or the like to be a plurality, it is possible to dramatically improve the improvement in gain is obtained by solving the above problems. 【0008】また、前記構成において、記前記最下層スパイラルと上層スパイラルとはバイアホールを介して連続接続してなる積層スパイラルアンテナとしたり、前記構成において、前記上層平面基板付きの上層スパイラルを複数として、それぞれを連続接続してなる積層スパイラルアンテナとしたことにより、利得の改善を飛躍的に向上させることができ、前記課題を解決したものである。 Further, in the above configuration, the serial the or the lowermost layer spirals and the upper spiral formed by continuously connected through the via hole multilayer spiral antenna, in the configuration, a plurality of upper spiral with the upper planar substrate , by having a laminated spiral antenna each formed by a continuous connection, it is possible to dramatically improve the improvement in gain is obtained by solving the above problems. 【0009】 【発明の実施の形態】以下、本発明の実施形態について図面に基づいて説明する。 DETAILED DESCRIPTION OF THE INVENTION Hereinafter, will be explained with reference to the drawings an embodiment of the present invention. その実施形態は、図1に示すように、グランド板付のスパイラルアンテナであって、 Embodiments thereof, as illustrated in FIG. 1, a spiral antenna ground Backed,
誘電体スラブからなる方形状の平面基板10上にエッチング処理等することによって表面の金属薄膜を剥離,溶解又は除去等することによって最下層スパイラル1が形成されている。 Peeling the metal thin film surface by etching or the like on towards planar substrate 10 having a shape of a dielectric slab, the bottom layer spiral 1 is formed by dissolving or removing the like. 図1においては、該最下層スパイラル1 In Figure 1, outermost lower spiral 1
のアーム数は2であるが、4,8等と2の倍数でもよく、この数に限定されることはない。 While the number of arms is 2, it may be a 4,8 or the like and a multiple of 2, is not limited to this number. さらに、図1においては、一つにアームに対しての巻数を4としたが、この巻数も制限されない。 Further, in FIG. 1 is set to 4 turns of the arm in one, the number of turns is also not limited. また、前記スパイラルアンテナは、グランド板を付けないこともある。 Further, the spiral antenna may also be careful to not ground plate. 【0010】また、上層スパイラル2も、前記平面基板10と同様な材質の上層平面基板11上に前記最下層スパイラル1と同様にして形成されている。 Further, the upper spiral 2 also the are formed in the same manner as the lowermost spiral 1 on the upper planar substrate 11 of the same material as the planar substrate 10. 特に、前記上層スパイラル2は、前記最下層スパイラル1に金属線等で接続されて連続している。 In particular, the upper layer spiral 2, the contiguous are connected by a metal wire or the like in the lowermost layer spiral 1. すなわち、前記上層スパイラル2は、最下層スパイラル1の一方のアームの外周側先端より、接続部(接続線)3を介して、さらにスパイラル外周側がより外側となるようにして、該最下層スパイラル1と同様に形成されている。 That is, the upper spiral 2 from the outer peripheral side leading end of one arm of the lowermost spiral 1, via a connecting portion (connecting line) 3, and further to the spiral outer circumferential side is more outward, outermost lower spiral 1 They are formed in the same manner as. 前記接続部3の上端位置の前記上層平面基板11にバイアホール4を穿孔することで、アームの外形終端部にチップ抵抗を負荷し無反射終端として、アームの終端でエネルギーが吸収され反射波がなくなり、進行波のみが存在することになる。 By drilling the via holes 4 in the upper planar substrate 11 of the upper end position of the connecting section 3, as free termination loaded chip resistor to the outer end of the arm, the energy absorbed at the end of the arm reflected wave no, only the traveling wave is present.
図2においては、平面基板10と上層平面基板11とは間隔が存在しているが、この間隔を無くした構成とすることもある。 In FIG. 2, although there is spacing between the planar substrate 10 and the upper planar substrate 11 may also be configured to eliminate this gap. 間隔を無くした構成の場合の接続部3は溶接接続とすることもある。 Connection of the case of the configuration without the space 3 is also a welded connection. 【0011】また、前記上層スパイラル2の他方のアームの外周側端からも、前記接続部3を介して、さらに上層側に、同様に形成されることもある。 [0011] Also, from the outer peripheral end of the other arm of the upper spiral 2, via the connection portion 3, further on the upper layer side, it may also be similarly formed. 以後の上側となる層については図示しないが、3層目からの上層スパイラル2は、3層目の上層平面基板11上に、前記2層目の上層平面基板11及び2層目の上層スパイラル2と同様に構成されている。 Although not shown for layer serving as a subsequent upper, upper spiral 2 from the third layer, on the upper planar substrate 11 of the third layer, the second layer of the upper planar substrate 11 and the second layer of the upper spiral 2 It is configured in the same manner as the. 【0012】給電構造としては、マイクロストリップ線路を用いた電力分配器20よりなり、その電力分配器2 [0012] As the feed structure consists of a power divider 20 using the microstrip line, the power divider 2
0によって前記最下層スパイラル1のアームの内側端より電力が均一に給電できるよう構造されている。 The power from the inner end of the lowermost spiral first arm is structured to be able to uniformly powered by 0. 図1の二つのアームのそれぞれに入る位相が0度、180度となるよう電力分配器20の線路長を調整され、そのアームの内端部より給電される。 Phase 0 degrees to enter each of the two arms of Figure 1, is adjusted the line length of the power distributor 20 so as to be 180 degrees, fed from the inner end of the arm. また、外部端より給電してもよい。 It is also possible to feed from the outside edge. 【0013】 【実施例】この実施例は、最下層スパイラル1のアーム数を2とし、アームの1〜2巻き目までを平面基板10 [0013] EXAMPLE This example the number of arms lowermost spiral 1 and 2, the planar substrate 10 up to 1-2 th-turn of the arm
上に1層目とした。 It was the first layer to the top. また、アームの3〜4巻き目を上層平面基板11上に2層目の上層スパイラル2とし、合計で巻き数4とした。 Further, the 3-4 th-turn of the arms and upper spiral 2 in the second layer on the upper planar substrate 11, and the number of turns 4 in total. 設計周波数を2〜3[GHz] とし、線路幅を2[mm]、アンテナの外周は2[GHz] の1.56λ The design frequency is 2~3 [GHz], 1.56λ of the line width 2 [mm], the outer periphery of the antenna 2 [GHz] 0とした。 0 and the. このグランド板付スパイラルアンテナもエッチングによって作製した。 This ground fitted with a spiral antenna was also produced by etching. 給電方法は一方のアームより同軸線路によって給電を行い、もう一方をグランド短絡とした。 Power supply method performs feed by a coaxial line from one arm, and a ground short-circuit the other. 【0014】また、平面基板10及び上層平面基板11 [0014] The planar substrate 10 and the upper planar substrate 11
の材質は、DICLAD880 である。 The material, which is DICLAD880. 基板条件は、誘電率εr Substrate conditions, dielectric constant εr
は2.17、基板厚は0.762[mm] 、 tanδは0.00025 、導電率5.6 ×10 7 [S/m] である。 2.17, the substrate thickness is 0.762 [mm], tan [delta is 0.00025, a conductivity of 5.6 × 10 7 [S / m ]. 上記の基板を使用しスパイラルアンテナを製造した。 To produce a spiral antenna using the above board. 【0015】上記のような構成の積層スパイラルアンテナによって測定を行った。 [0015] The measurements were made by stacking spiral antenna of the above-described configuration. 測定する際にはY−Z平面をE面とし、X−Z平面をH面とし、2[GHz]での測定結果 When measured as the E plane Y-Z plane, the X-Z plane and H-plane, the measurement result of the 2 [GHz]
(experiment)及びシミュレーション結果(simulated)をE面アンテナパターンとして図3に示す。 FIG 3 (experiment) and simulation results (simulated) as E plane antenna pattern. これよりシミュレーション値と測定結果はアンテナの半値幅において良好な結果を得ることができた。 From this simulation value and the measured results could be obtained good results in the half-width of the antenna. アンテナの半値幅は70 The half-width of the antenna 70
°、利得は2.4[dBi]を得ることができた。 °, gain could be obtained 2.4 [dBi]. この結果から、従来のプリント型スパイラルアンテナ(図5参照) From this result, conventional printed spiral antenna (see FIG. 5)
に比べアンテナの半地幅が10°狭くなり、利得を1[dBi] Hanji width of the antenna becomes narrower 10 ° compared with a gain 1 [dBi]
改善することができた。 We were able to improve. また正面での軸比は1.84[dBi] The axial ratio of the front is 1.84 [dBi]
となり、従来のプリント型スパイラルアンテナと同様に円偏波アンテナとして動作していることが判る。 Next, it can be seen that operates as a circularly polarized antenna as in the conventional printed spiral antenna. 【0016】本発明の積層スパイラルアンテナは、従来のスパイラルアンテナと同様に広帯域であり、サイドローブが無いことである。 [0016] The laminated spiral antenna of the present invention is a wide band as in the conventional spiral antenna, is that the side lobe is not. さらに積層構造にすることにより、指向性が若干狭くなるが、利得を改善することができることが最大の利点である。 By further stacked structure, directivity is slightly narrowed, that can improve the gain is the maximum benefit. このような構成により、 With such a configuration,
本発明の積層スパイラルアンテナは、広帯域であり、指向性が他のアンテナに比べて広く、円偏波であるためどの方向から情報を受信しても、アンテナによる偏波損失が無いため、図4に示すような室内用無線LANに適したアンテナであると考えられる。 Stacking spiral antenna of the present invention is a broadband, directivity is wider than the other antenna, also receive information from any direction for a circular polarized wave, because there is no polarization loss due to antenna, FIG. 4 it is considered to be an antenna suitable for indoor wireless LAN, such as shown in. 【0017】 【発明の効果】本発明によれば、積層としたことによるスパイラルアンテナ構造であるがゆえに、指向性が比較的広いのみならず、利得を従来の平面のスパイラルアンテナよりも高くできる最大の利点がある。 According to the present invention, the maximum is a spiral antenna structure due to the a laminated therefore, that not only has a relatively wide directivity, gain may be higher than the spiral antenna of the conventional planar there is an advantage.

【図面の簡単な説明】 【図1】本発明の概略斜視図【図2】図1の断面図【図3】本発明のE面のアンテナパタンーン図【図4】本発明の利用した使用例の概念図【図5】従来のスパイラルアンテナの概略斜視図【図6】従来のスパイラルアンテナのE面のアンテナパタンーン図【符号の説明】 1…最下層スパイラル2…上層スパイラル4…バイアホール10…平面基板11…上層平面基板 Using BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a schematic perspective view Figure 2 antenna pattern over down view of E-plane of the sectional view of FIG. 1 FIG. 3 the invention [4] The present invention of the present invention conceptual view of Application example FIG. 5 eXPLANATION oF REFERENCE nUMERALS schematic perspective view of a conventional spiral antenna 6 antenna pattern over down view of E-plane of the conventional spiral antenna 1 ... lowermost spiral 2 ... upper spiral 4 ... via holes 10 ... planar substrate 11 ... upper planar substrate

Claims (1)

  1. 【特許請求の範囲】 【請求項1】 誘電体スラブからなる平面基板上にエッチング処理等にて形成された最下層スパイラルと、該最下層スパイラルの外周側端より一段上側に位置し、該位置より放射方向に向かい、且つ前記平面基板と同材質の上層平面基板に形成された上層スパイラルとからなり、 [Claims 1. A bottom layer spiral formed in a plane on a substrate made of a dielectric slab by etching or the like, positioned above one step from the outer peripheral side edge of the outermost lower spiral, the position more toward the radial direction, and consists to the planar substrate and the upper layer spiral formed in an upper layer planar substrate made of the same material,
    前記最下層スパイラルと上層スパイラルとは連続接続され、且つそれぞれのアーム数を複数としてなることを特徴とする積層スパイラルアンテナ。 The lowermost spiral and the upper spiral is continuous connected, and each multilayer spiral antenna characterized by comprising a number of arms as multiple. 【請求項2】 前記最下層スパイラルと上層スパイラルとはバイアホールを介して連続接続してなることを特徴とする積層スパイラルアンテナ。 2. A multilayer spiral antenna characterized by comprising continuously connected through the via hole and the lowermost spiral and the upper spiral. 【請求項3】 請求項1又は2において、前記上層平面基板付きの上層スパイラルを複数として、それぞれを連続接続してなることを特徴とする積層スパイラルアンテナ。 3. The claim 1 or 2, wherein the plurality of upper layer spiral with the upper planar substrate, stacking spiral antenna characterized by comprising a each successive connection.
JP2001262492A 2001-08-30 2001-08-30 Laminated spiral antenna Pending JP2003078336A (en)

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