JP2001339227A - Helical antenna and its resonance frequency adjusting method - Google Patents
Helical antenna and its resonance frequency adjusting methodInfo
- Publication number
- JP2001339227A JP2001339227A JP2000158058A JP2000158058A JP2001339227A JP 2001339227 A JP2001339227 A JP 2001339227A JP 2000158058 A JP2000158058 A JP 2000158058A JP 2000158058 A JP2000158058 A JP 2000158058A JP 2001339227 A JP2001339227 A JP 2001339227A
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- Prior art keywords
- resonance frequency
- cylindrical member
- helical antenna
- helical
- antenna
- Prior art date
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Abstract
Description
【０００１】[0001]
【発明の属する技術分野】本発明は、人工衛星からの電
波（以下「衛星波」とも呼ぶ。）又は地上での電波（以
下「地上波」とも呼ぶ。）を受信してデジタルラジオ放
送を聴取することが可能なデジタルラジオ受信機に関
し、特に、デジタルラジオ受信機に用いられるアンテナ
に関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention receives digital radio broadcasts by receiving radio waves from artificial satellites (hereinafter also referred to as "satellite waves") or radio waves on the ground (hereinafter also referred to as "terrestrial waves"). And more particularly to an antenna used in a digital radio receiver.
【０００２】[0002]
【従来の技術】最近、人工衛星からの電波（衛星波）又
は地上波を受信して、デジタルラジオ放送を聴取可能に
したデジタルラジオ受信機が開発され、米国において実
用化されようとしている。このデジタルラジオ受信機
は、自動車等の移動局に搭載され、周波数が約２．３Ｇ
Ｈｚの電波を受信してラジオ放送を聴取することが可能
である。すなわち、デジタルラジオ受信機は、モバイル
放送を聴取することが可能なラジオ受信機である。尚、
地上波は、衛星波を一旦、地球局で受信した後、周波数
を若干シフトしたものである。2. Description of the Related Art Recently, a digital radio receiver capable of receiving a radio wave (satellite wave) or a terrestrial wave from an artificial satellite so as to listen to a digital radio broadcast has been developed and is being put to practical use in the United States. This digital radio receiver is mounted on a mobile station such as an automobile and has a frequency of about 2.3G.
It is possible to listen to a radio broadcast by receiving a radio wave of Hz. That is, the digital radio receiver is a radio receiver that can listen to mobile broadcasts. still,
The terrestrial wave is obtained by temporarily receiving a satellite wave at an earth station and then slightly shifting the frequency.
【０００３】このような、約２．３ＧＨｚの周波数の電
波を受信するためには、自動車の車外にアンテナを設置
する必要がある。そのようなアンテナとしては、種々の
構造のものが考えられるが、平面型（平板型）ではなく
スティック型とすることが一般的である。また、周知の
ように、自由空間に放射される電磁波は、波の進行方向
と直角な面内に振動する電界と磁界をもった横波で、電
界と磁界はその面内で強さが変化するが、これを偏波と
いう。衛星波は円偏波であるのに対して、地上波は直線
偏波である。In order to receive such a radio wave of a frequency of about 2.3 GHz, it is necessary to install an antenna outside the automobile. As such an antenna, various antennas can be considered, but a stick type is generally used instead of a flat type (flat type). Also, as is well known, an electromagnetic wave radiated in free space is a transverse wave having an electric field and a magnetic field oscillating in a plane perpendicular to the traveling direction of the wave, and the electric field and the magnetic field change in intensity in the plane. However, this is called polarization. Satellite waves are circularly polarized waves, whereas terrestrial waves are linearly polarized waves.
【０００４】以下では、衛星波を受信するためのアンテ
ナについて主に説明する。スティック型アンテナの１つ
として、ヘリカルアンテナが知られている。ヘリカルア
ンテナは、円筒または円柱（以下「円筒」と呼ぶ。）状
部材の周りに少なくとも１本の導線をヘリックス状（螺
旋状）に巻いた構造をしており、上述した円偏波を効率
良く受信することができる。したがって、ヘリカルアン
テナは、専ら衛星波を受信するために使用される。円筒
状部材の材料としてはプラスチックなどの絶縁材料が使
用される。また、導線の本数としては、例えば、４本が
使用される。一方、円筒状部材に複数本の導線をヘリッ
クス状に巻くのは実際には非常に困難である。その為、
その代りに、絶縁シートに複数本の導体パターンを印刷
したもの（以下「導体パターン付き絶縁シート」と呼
ぶ。）を、円筒状部材に巻くようにしたものも提案され
ている。Hereinafter, an antenna for receiving a satellite wave will be mainly described. A helical antenna is known as one of the stick antennas. The helical antenna has a structure in which at least one conductive wire is wound in a helical (spiral) shape around a cylindrical or cylindrical (hereinafter, referred to as “cylindrical”) member, so that the above-described circularly polarized wave can be efficiently emitted. Can be received. Therefore, the helical antenna is used exclusively for receiving satellite waves. As a material of the cylindrical member, an insulating material such as plastic is used. As the number of conductors, for example, four wires are used. On the other hand, it is actually very difficult to wind a plurality of wires in a helix shape around a cylindrical member. For that reason,
Instead, there has been proposed a sheet in which a plurality of conductor patterns are printed on an insulating sheet (hereinafter, referred to as “insulating sheet with a conductor pattern”) wound around a cylindrical member.
【０００５】このような構造のヘリカルアンテナにおい
ては、その共振周波数が円筒状部材の高さ（長さ）、直
径、および比誘電率等によって決定されてしまう。In a helical antenna having such a structure, the resonance frequency is determined by the height (length), diameter, relative permittivity, and the like of the cylindrical member.
【０００６】図６に、ヘリカルアンテナ（以下、単に
「アンテナ」とも呼ぶ。）の周波数特性を示す。図６に
おいて、横軸は周波数ｆ、縦軸は出力リターンロスを表
わしている。図６から明らかなように、共振点で出力リ
ターンロスが最小となる。この共振点は、上述した円筒
状部材の寸法のバラツキによって、図６の矢印で示すよ
うに、移動（シフト）してしまう。したがって、ヘリカ
ルアンテナを使用して約２．３ＧＨｚの周波数の衛星波
（円偏波）を受信するためには、共振点（アンテナの共
振周波数）を所望の共振周波数（２．３ＧＨｚ）にする
必要がある。しかしながら、アンテナの製造工程上、寸
法のバラツキは避けられず、何らかの調整手段（調整方
法）を用いて、アンテナの共振周波数を所望の共振周波
数に調整する必要がある。FIG. 6 shows frequency characteristics of a helical antenna (hereinafter, also simply referred to as "antenna"). 6, the horizontal axis represents the frequency f, and the vertical axis represents the output return loss. As is clear from FIG. 6, the output return loss is minimized at the resonance point. The resonance point moves (shifts) as indicated by the arrow in FIG. 6 due to the above-mentioned variation in the size of the cylindrical member. Therefore, in order to receive a satellite wave (circularly polarized wave) having a frequency of about 2.3 GHz using a helical antenna, it is necessary to set a resonance point (resonance frequency of the antenna) to a desired resonance frequency (2.3 GHz). There is. However, variations in dimensions are inevitable in the manufacturing process of the antenna, and it is necessary to adjust the resonance frequency of the antenna to a desired resonance frequency by using some adjustment means (adjustment method).
【０００７】従来においては、アンテナの共振周波数を
所望の共振周波数に調整を、ヘリカルアンテナの先端部
をカットしてアンテナの長さの調整することによって行
っている。すなわち、製造時（製造工程）において、あ
らかじめヘリカルアンテナの長さを、所望の共振周波数
より低い周波数を受信可能なように長めに作っておき、
調整段階（調整工程）において、共振点が所望の共振周
波数となるように、ヘリカルアンテナの先端部をカット
して、アンテナの長さを調整している。このような調整
方法をここでは「カッティング方法」と呼ぶことにす
る。Conventionally, the resonance frequency of the antenna is adjusted to a desired resonance frequency by cutting the tip of the helical antenna and adjusting the length of the antenna. That is, at the time of manufacturing (manufacturing process), the length of the helical antenna is made long in advance so that a frequency lower than the desired resonance frequency can be received,
In the adjustment step (adjustment step), the tip of the helical antenna is cut to adjust the length of the antenna so that the resonance point has a desired resonance frequency. Such an adjustment method will be referred to herein as a “cutting method”.
【０００８】尚、円筒状部材の周りに複数本の導線をヘ
リックス状（螺旋状）に巻いた構造のヘリカルアンテナ
の場合、そのヘリカルアンテナで受信された衛星波（円
偏波）は、移相器によって位相をシフトすることにより
位相を一致させて（調整して）合成された後、低雑音増
幅器（ＬＮＡ）によって増幅され、受信機本体へ送られ
る。ここで、ヘリカルアンテナ（アンテナ）と移相器と
ＬＮＡとの組合せは、アンテナ装置と呼ばれる。また、
円筒状部材の周りに１本の導線のみをヘリックス状（螺
旋状）に巻いた構造のヘリカルアンテナの場合には、移
相器は不要である。In the case of a helical antenna having a structure in which a plurality of conductive wires are wound around a cylindrical member in a helical shape (spiral shape), a satellite wave (circularly polarized wave) received by the helical antenna is phase-shifted. After the phases are matched (adjusted) by shifting the phase by a receiver, the signals are combined, then amplified by a low noise amplifier (LNA), and sent to the receiver body. Here, the combination of the helical antenna (antenna), the phase shifter, and the LNA is called an antenna device. Also,
In the case of a helical antenna having a structure in which only one conducting wire is wound around a cylindrical member in a helix (helical shape), a phase shifter is unnecessary.
【０００９】[0009]
【発明が解決しようとする課題】上述したように、従来
のヘリカルアンテナでは、その共振周波数を所望の共振
周波数に調整するために、その先端部（上端部）をカッ
トすることが行われている。しかしながら、このような
カッティング方法では、正確にヘリカルアンテナの共振
周波数（共振点）を所望の共振周波数に一致させるため
には、ヘリカルアンテナの上端部を少しずつカットする
必要があり、非常に手間が掛かる作業になってしまう。
何故なら、一旦、アンテナを短めにカットしてしまう
と、最早、アンテナの共振周波数を所望の共振周波数に
戻すことは不可能になってしまい、そのヘリカルアンテ
ナは使いものにならなくなってしまうからである。した
がって、ヘリカルアンテナの上端部のカットには細心の
注意が必要で、非常に手間が掛かる作業になってしま
う。As described above, in the conventional helical antenna, the tip (upper end) is cut to adjust the resonance frequency to a desired resonance frequency. . However, in such a cutting method, it is necessary to cut the upper end of the helical antenna little by little in order to accurately match the resonance frequency (resonance point) of the helical antenna to a desired resonance frequency, which is very troublesome. It will take time.
This is because once the antenna is cut short, it is no longer possible to return the antenna's resonance frequency to the desired resonance frequency, and the helical antenna becomes useless. . Therefore, the cutting of the upper end portion of the helical antenna requires extreme care, which is a very time-consuming operation.
【００１０】そのため、従来のようなカッティング方法
以外の調整方法（調整手段）によって、ヘリカルアンテ
ナの共振周波数を容易に所望の共振周波数に調整できる
ようにすることが望まれる。Therefore, it is desired that the resonance frequency of the helical antenna can be easily adjusted to a desired resonance frequency by an adjustment method (adjustment means) other than the conventional cutting method.
【００１１】したがって、本発明の課題は、共振周波数
の調整を容易に行うことができるヘリカルアンテナを提
供することにある。Therefore, an object of the present invention is to provide a helical antenna which can easily adjust the resonance frequency.
【００１２】本発明の他の課題は、ヘリカルアンテナの
共振周波数を所望の共振周波数に容易に調整することが
可能な調整方法を提供することにある。Another object of the present invention is to provide an adjustment method capable of easily adjusting the resonance frequency of a helical antenna to a desired resonance frequency.
【００１３】[0013]
【課題を解決するための手段】本発明者らは、ヘリカル
アンテナの共振周波数を所望の共振周波数に容易に調整
できるようにするにはどのような構造（構成）を採用す
れば良いか否かについて、種々思案した。前述したよう
に、ヘリカルアンテナの共振周波数は、円筒状部材の高
さ（長さ）、直径、および比誘電率等のパラメータによ
って決定される。これらのパラメータの内、円筒状部材
の高さ（長さ）や直径を変更するすることは、実際上極
めて困難である。そこで、本発明者らは、円筒状部材の
比誘電率を変化させることができれば、ヘリカルアンテ
ナの共振周波数を所望の共振周波数に容易に調整できる
筈である、という結論に本発明者らは想到した。The present inventors have determined what kind of structure (configuration) should be adopted so that the resonance frequency of a helical antenna can be easily adjusted to a desired resonance frequency. I thought variously about. As described above, the resonance frequency of the helical antenna is determined by parameters such as the height (length), diameter, and relative permittivity of the cylindrical member. It is actually very difficult to change the height (length) and diameter of the cylindrical member among these parameters. Therefore, the present inventors came to the conclusion that if the relative dielectric constant of the cylindrical member could be changed, the resonance frequency of the helical antenna should be easily adjusted to a desired resonance frequency. did.
【００１４】尚、円筒状部材の比誘電率を変えるには種
々の方法が考えられる。本発明では、比誘電率の高い雄
ネジ部材を円筒状部材に挿入することより、円筒状部材
の比誘電率を高くして、等価的に円筒状部材の長さを短
くなるように調整できるようにした。Various methods are conceivable for changing the relative permittivity of the cylindrical member. In the present invention, by inserting a male screw member having a high relative dielectric constant into the cylindrical member, the relative dielectric constant of the cylindrical member can be increased, and the length of the cylindrical member can be adjusted to be equivalently shortened. I did it.
【００１５】すなわち、本発明によれば、絶縁体から成
る円筒状部材（１１）と、この円筒状部材の周りにヘリ
ックス状に巻かれた少なくとも１本の導線（１２）とか
ら構成されたヘリカルアンテナ（１０）に於いて、円筒
状部材の上端部の内周壁に雌ネジが切られたネジ穴（１
３）を設け、このネジ穴に螺合可能で、円筒状部材の比
誘電率以上の比誘電率（εr）を持つ雄ネジ部材（１
４，１４Ａ）を有することを特徴とするヘリカルアンテ
ナが得られる。That is, according to the present invention, a helical member composed of a cylindrical member (11) made of an insulator and at least one conductor (12) wound in a helix around the cylindrical member. In the antenna (10), the inner peripheral wall at the upper end of the cylindrical member has a screw hole (1
3), a male screw member (1) that can be screwed into this screw hole and has a relative dielectric constant (εr) equal to or higher than the relative dielectric constant of the cylindrical member.
4, 14A) is obtained.
【００１６】上記ヘリカルアンテナ（１０）において、
雄ネジ部材は、例えば、セラミックからなる。また、雄
ネジ部材はボルト（１４）であって良い。In the helical antenna (10),
The male screw member is made of, for example, ceramic. The male screw member may be a bolt (14).
【００１７】また、本発明によれば、上記ヘリカルアン
テナ（１４）の共振周波数を所望の共振周波数に調整す
る方法であって、円筒状部材（１１）を、所望の共振周
波数より低い周波数を受信可能な長さとなるように若干
長めに作る工程と、雄ネジ部材（１４，１４Ａ）をネジ
孔（１３）に螺合してヘリカルアンテナの共振周波数を
所望の共振周波数に調整する工程と、を含むことを特徴
とするヘリカルアンテナの共振周波数調整方法が得られ
る。Further, according to the present invention, there is provided a method for adjusting the resonance frequency of the helical antenna (14) to a desired resonance frequency, wherein the cylindrical member (11) receives a frequency lower than the desired resonance frequency. A step of slightly increasing the length to be as long as possible and a step of screwing the male screw members (14, 14A) into the screw holes (13) to adjust the resonance frequency of the helical antenna to a desired resonance frequency. Thus, a method for adjusting the resonance frequency of a helical antenna is obtained.
【００１８】尚、上記括弧内の符号は、本発明の理解を
容易にするために付したものであり、一例にすぎず、こ
れらに限定されないのは勿論である。Note that the reference numerals in parentheses are provided for easy understanding of the present invention, and are merely examples, and it is a matter of course that the present invention is not limited to these.
【００１９】[0019]
【作用】雄ネジ部材の比誘電率が円筒状部材の比誘電率
以上であるので、雄ネジ部材を円筒状部材のネジ穴に挿
入すると、波長短縮効果により、等価的に円筒状部材の
長さを短くすることができる。すなわち、雄ネジ部材の
円筒状部材への挿入量に応じて、円筒状部材の長さを等
価的に調整でき、結果的に、ヘリカルアンテナの共振周
波数を所望の共振周波数に容易に調整することが可能と
なる。The relative permittivity of the male screw member is equal to or greater than the relative permittivity of the cylindrical member. Therefore, when the male screw member is inserted into the screw hole of the cylindrical member, the equivalent length of the cylindrical member is reduced due to the wavelength shortening effect. Can be shortened. That is, the length of the cylindrical member can be equivalently adjusted according to the insertion amount of the male screw member into the cylindrical member, and as a result, the resonance frequency of the helical antenna can be easily adjusted to a desired resonance frequency. Becomes possible.
【００２０】[0020]
【発明の実施の形態】以下、図面を参照して、本発明の
実施の形態について詳細に説明する。Embodiments of the present invention will be described below in detail with reference to the drawings.
【００２１】図１を参照して、本発明の一実施の形態に
係るヘリカルアンテナ１０について説明する。図示のヘ
リカルアンテナ１０は、比誘電率εrが２〜４の絶縁体
から成る中空円筒状部材１１と、この中空円筒状部材１
１の周りにヘリックス状に巻かれた４本の導線１２とを
有する。中空円状上部材１１の材料は、例えば、プラス
チックから成る。Referring to FIG. 1, a helical antenna 10 according to one embodiment of the present invention will be described. The illustrated helical antenna 10 includes a hollow cylindrical member 11 made of an insulator having a relative dielectric constant εr of 2 to 4;
1 and four conductive wires 12 wound in a helix. The material of the hollow circular upper member 11 is made of, for example, plastic.
【００２２】ここで、４本の導線１２を中空円筒状部材
１１の周りにヘリックス状に巻く代りに、上述した導体
パターン付き絶縁シート（図示せず）を中空円筒状部材
１１に巻いても良い。Here, instead of winding the four conductive wires 12 in a helical shape around the hollow cylindrical member 11, the above-described insulating sheet with a conductor pattern (not shown) may be wound around the hollow cylindrical member 11. .
【００２３】中空円筒状部材１１の上端部の内周壁に
は、雌ネジが切られたネジ穴１３が設けられている。ヘ
リカルアンテナ１０は、さらに、このネジ穴１３に螺合
可能な雄ネジ部材１４を備えている。この雄ネジ部材１
４は、中空円筒状部材１１の比誘電率以上の比誘電率を
持っている。本実施の形態では、雄ネジ部材１４は、比
誘電率εrが１０〜１００のセラミックボルトから成
る。セラミックボルト１４は、ネジ穴１３に螺合される
螺子部１４１と、その先端にある頭部１４２から構成さ
れている。On the inner peripheral wall at the upper end of the hollow cylindrical member 11, a screw hole 13 having a female thread is provided. The helical antenna 10 further includes a male screw member 14 that can be screwed into the screw hole 13. This male screw member 1
Reference numeral 4 has a relative permittivity equal to or higher than the relative permittivity of the hollow cylindrical member 11. In the present embodiment, the male screw member 14 is made of a ceramic bolt having a relative dielectric constant εr of 10 to 100. The ceramic bolt 14 includes a screw portion 141 screwed into the screw hole 13 and a head portion 142 at the tip thereof.
【００２４】次に、図２を参照して、図１に示したヘリ
カルアンテナ１０の共振周波数を所望の共振周波数に調
整する方法について説明する。Next, a method of adjusting the resonance frequency of the helical antenna 10 shown in FIG. 1 to a desired resonance frequency will be described with reference to FIG.
【００２５】先ず、中空円筒状部材１１を、所望の共振
周波数より低い周波数を受信可能な長さとなるように若
干長めに作っておく。そして、雄ネジ部材（セラミック
ボルト）１４をネジ孔１３（図１）に螺合して、ヘリカ
ルアンテナ１０の共振周波数を所望の共振周波数に調整
する。ここで、セラミックボルト１４は、ネジ穴１３に
対して図２の矢印Ａに示すように、その挿入距離を容易
に調整することが可能である。First, the hollow cylindrical member 11 is made slightly longer so that it can receive a frequency lower than a desired resonance frequency. Then, the male screw member (ceramic bolt) 14 is screwed into the screw hole 13 (FIG. 1) to adjust the resonance frequency of the helical antenna 10 to a desired resonance frequency. Here, the insertion distance of the ceramic bolt 14 can be easily adjusted with respect to the screw hole 13 as shown by an arrow A in FIG.
【００２６】セラミックボルト１４の比誘電率εrが中
空円筒状部材１１の比誘電率εrよりも高いので、セラ
ミックボルト１４を中空円筒状部材１１のネジ穴１３に
挿入すると、波長短縮効果により、等価的に中空円筒状
部材１１の長さを短くすることができる。すなわち、セ
ラミックボルト１４の中空円筒状部材１１への挿入量に
応じて、中空円筒状部材１１の長さを等価的に調整でき
る。詳述すると、上記挿入量が多ければ、中空円筒状部
材１１の長さが等価的に短くなり、挿入量が少なけれ
ば、中空円筒状部材１１の長さが等価的に長くなる。そ
の結果、ヘリカルアンテナ１０の共振周波数を所望の共
振周波数に容易に調整することが可能となる。Since the relative permittivity εr of the ceramic bolt 14 is higher than the relative permittivity εr of the hollow cylindrical member 11, when the ceramic bolt 14 is inserted into the screw hole 13 of the hollow cylindrical member 11, the equivalent is obtained due to the wavelength shortening effect. Thus, the length of the hollow cylindrical member 11 can be shortened. That is, the length of the hollow cylindrical member 11 can be equivalently adjusted according to the insertion amount of the ceramic bolt 14 into the hollow cylindrical member 11. More specifically, if the insertion amount is large, the length of the hollow cylindrical member 11 is equivalently short, and if the insertion amount is small, the length of the hollow cylindrical member 11 is equivalently long. As a result, the resonance frequency of the helical antenna 10 can be easily adjusted to a desired resonance frequency.
【００２７】以上、本発明について好ましい実施の形態
によって説明してきたが、本発明は上述した実施の形態
に限定しないのは勿論である。例えば、上記実施の形態
では、雄ネジ部材としてセラミックボルト１４を使用し
ているが、これに限定せず、図３に示されるような、雄
ネジ１４Ａでも良い。また、雄ネジ１４Ａの頭部の形状
も、図４に示されるような、六角形の凹部を有するもの
だけでなく、図５に示されるような、十字形の溝を有す
るものでも良い。さらに、雄ネジ部材の材料はセラミッ
クに限定せず、中空円状状部材１１の比誘電率εrと同
等かそれ以上の比誘電率εrを持つものであれば何でも
良い。さらに、円筒状部材の周りにヘリックス状に巻か
れる導線の本数も４本のものに限定せず、少なくとも１
本あれば良い。Although the present invention has been described with reference to the preferred embodiments, the present invention is, of course, not limited to the above-described embodiments. For example, in the above-described embodiment, the ceramic bolt 14 is used as the male screw member. However, the present invention is not limited to this, and a male screw 14A as shown in FIG. 3 may be used. Further, the shape of the head of the male screw 14A may be not only a hexagonal concave portion as shown in FIG. 4 but also a cross-shaped groove as shown in FIG. Further, the material of the male screw member is not limited to ceramic, and any material having a relative dielectric constant εr equal to or higher than the relative dielectric constant εr of the hollow circular member 11 may be used. Further, the number of conductors wound in a helix around the cylindrical member is not limited to four, and may be at least one.
I just need a book.
【００２８】[0028]
【発明の効果】以上の説明から明らかなように、本発明
では、円筒状部材の上端部の内周壁に雌ネジが切られた
ネジ穴を設け、このネジ穴に螺合可能で、円筒状部材の
比誘電率以上の比誘電率を持つ雄ネジ部材を有するの
で、雄ネジ部材の円筒状部材への挿入距離に応じて、円
筒状部材の長さを等価的に調整でき、結果的に、ヘリカ
ルアンテナの共振周波数を所望の共振周波数に容易に調
整することが可能となる。As is apparent from the above description, according to the present invention, a screw hole with a female screw is provided in the inner peripheral wall at the upper end of the cylindrical member, and the screw hole can be screwed into the cylindrical hole. Since it has a male screw member having a relative dielectric constant equal to or higher than the relative dielectric constant of the member, the length of the cylindrical member can be equivalently adjusted according to the insertion distance of the male screw member into the cylindrical member, and as a result, The resonance frequency of the helical antenna can be easily adjusted to a desired resonance frequency.
【図１】本発明の一実施の形態に係るヘリカルアンテナ
の構成を示す斜視図である。FIG. 1 is a perspective view showing a configuration of a helical antenna according to one embodiment of the present invention.
【図２】図１に示したヘリカルアンテナの共振周波数を
調整する方法を説明するための斜視図である。FIG. 2 is a perspective view for explaining a method of adjusting a resonance frequency of the helical antenna shown in FIG.
【図３】図１に示したヘリカルアンテナのセラミックボ
ルトの代りに使用可能な雄ネジを示す断面図である。FIG. 3 is a sectional view showing a male screw that can be used in place of the ceramic bolt of the helical antenna shown in FIG. 1;
【図４】図３に示した雄ネジを構成する頭部の形状の一
例を示す平面図である。FIG. 4 is a plan view showing an example of the shape of a head constituting the male screw shown in FIG. 3;
【図５】図３に示した雄ネジを構成する頭部における形
状の他の例を示す平面図である。FIG. 5 is a plan view showing another example of the shape of the head constituting the male screw shown in FIG. 3;
【図６】ヘリカルアンテナの周波数特性を示す図であ
る。FIG. 6 is a diagram illustrating frequency characteristics of a helical antenna.
１０ ヘリカルアンテナ １１ 中空円筒状部材 １２ 導線 １３ ネジ穴 １４ セラミックボルト（雄ネジ部材） １４Ａ 雄ネジ DESCRIPTION OF SYMBOLS 10 Helical antenna 11 Hollow cylindrical member 12 Lead wire 13 Screw hole 14 Ceramic bolt (male screw member) 14A Male screw
Claims (4)
部材の周りにヘリックス状に巻かれた少なくとも１本の
導線とから構成されたヘリカルアンテナに於いて、 前記円筒状部材の上端部の内周壁に雌ネジが切られたネ
ジ穴を設け、 該ネジ穴に螺合可能で、前記円筒状部材の比誘電率以上
の比誘電率を持つ雄ネジ部材を有することを特徴とする
ヘリカルアンテナ。1. A helical antenna comprising a cylindrical member made of an insulator and at least one conductive wire wound in a helical shape around the cylindrical member, wherein an upper end of the cylindrical member is provided. A helical thread provided with a threaded hole provided with an internal thread on an inner peripheral wall of the helical member, the male threaded member being capable of being screwed into the threaded hole and having a dielectric constant greater than or equal to the dielectric constant of the cylindrical member. antenna.
請求項１記載のヘリカルアンテナ。2. The male screw member is made of ceramic.
The helical antenna according to claim 1.
１記載のヘリカルアンテナ。3. The helical antenna according to claim 1, wherein said male screw member is a bolt.
振周波数を所望の共振周波数に調整する方法であって、 前記円筒状部材を、所望の共振周波数より低い周波数を
受信可能な長さとなるように若干長めに作る工程と、 前記雄ネジ部材を前記ネジ孔に螺合して、前記ヘリカル
アンテナの共振周波数を前記所望の共振周波数に調整す
る工程と、を含むことを特徴とするヘリカルアンテナの
共振周波数調整方法。4. A method for adjusting a resonance frequency of a helical antenna to a desired resonance frequency according to claim 1, wherein the cylindrical member has a length capable of receiving a frequency lower than the desired resonance frequency. And a step of adjusting the resonance frequency of the helical antenna to the desired resonance frequency by screwing the male screw member into the screw hole. Resonance frequency adjustment method.
Priority Applications (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2000158058A JP2001339227A (en) | 2000-05-29 | 2000-05-29 | Helical antenna and its resonance frequency adjusting method |
| US09/859,246 US6429830B2 (en) | 2000-05-18 | 2001-05-17 | Helical antenna, antenna unit, composite antenna |
| US10/162,735 US6587081B2 (en) | 2000-05-18 | 2002-06-05 | Helical antenna, antenna unit, composite antenna |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2000158058A JP2001339227A (en) | 2000-05-29 | 2000-05-29 | Helical antenna and its resonance frequency adjusting method |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JP2001339227A true JP2001339227A (en) | 2001-12-07 |
Family
ID=18662586
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP2000158058A Pending JP2001339227A (en) | 2000-05-18 | 2000-05-29 | Helical antenna and its resonance frequency adjusting method |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP2001339227A (en) |
Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6906683B2 (en) | 2002-08-07 | 2005-06-14 | Hisamatsu Nakano | Circular polarized wave reception antenna |
| US7262745B2 (en) | 2005-03-10 | 2007-08-28 | Mitsumi Electric Co., Ltd. | Antenna unit |
| US7295172B2 (en) | 2005-03-10 | 2007-11-13 | Mitsumi Electric Co., Ltd. | Antenna unit |
| US7324062B2 (en) | 2005-03-10 | 2008-01-29 | Mitsumi Electric Co., Ltd. | Antenna unit |
| US7345648B2 (en) | 2005-03-10 | 2008-03-18 | Mitsumi Electric Co., Ltd. | Antenna unit |
| US7586461B2 (en) | 2005-07-28 | 2009-09-08 | Mitsumi Electric Co., Ltd. | Antenna unit having improved antenna radiation characteristics |
| US7782272B2 (en) | 2006-09-21 | 2010-08-24 | Mitsumi Electric Co., Ltd. | Antenna apparatus |
| US8228250B2 (en) | 2008-04-23 | 2012-07-24 | Mitsumi Electric Co., Ltd. | Composite antenna apparatus |
-
2000
- 2000-05-29 JP JP2000158058A patent/JP2001339227A/en active Pending
Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6906683B2 (en) | 2002-08-07 | 2005-06-14 | Hisamatsu Nakano | Circular polarized wave reception antenna |
| US7262745B2 (en) | 2005-03-10 | 2007-08-28 | Mitsumi Electric Co., Ltd. | Antenna unit |
| US7295172B2 (en) | 2005-03-10 | 2007-11-13 | Mitsumi Electric Co., Ltd. | Antenna unit |
| US7324062B2 (en) | 2005-03-10 | 2008-01-29 | Mitsumi Electric Co., Ltd. | Antenna unit |
| US7345648B2 (en) | 2005-03-10 | 2008-03-18 | Mitsumi Electric Co., Ltd. | Antenna unit |
| US7586461B2 (en) | 2005-07-28 | 2009-09-08 | Mitsumi Electric Co., Ltd. | Antenna unit having improved antenna radiation characteristics |
| US7782272B2 (en) | 2006-09-21 | 2010-08-24 | Mitsumi Electric Co., Ltd. | Antenna apparatus |
| US8228250B2 (en) | 2008-04-23 | 2012-07-24 | Mitsumi Electric Co., Ltd. | Composite antenna apparatus |
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