JPH1048304A - Loop gap resonator - Google Patents
Loop gap resonatorInfo
- Publication number
- JPH1048304A JPH1048304A JP8206957A JP20695796A JPH1048304A JP H1048304 A JPH1048304 A JP H1048304A JP 8206957 A JP8206957 A JP 8206957A JP 20695796 A JP20695796 A JP 20695796A JP H1048304 A JPH1048304 A JP H1048304A
- Authority
- JP
- Japan
- Prior art keywords
- loop
- gap
- resonator
- height
- resonance frequency
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
Landscapes
- Control Of Motors That Do Not Use Commutators (AREA)
Abstract
Description
【0001】[0001]
【発明の属する技術分野】 本発明は、電子スピン共鳴
装置に用いられるループギャップ共振器の改良に関する
ものである。The present invention relates to an improvement of a loop gap resonator used in an electron spin resonance device.
【0002】[0002]
【従来の技術】 図1は、特公平3−79670号に記
載されているループギャップ共振器および共振周波数調
整機構を示している。ループギャップ共振器は、図1に
示すように、ループ状の電極1をループの軸心Oに平行
なギャップ2により切断した構造を持ち、外部のアンテ
ナ回路との結合を介して供給されるマイクロ波電流が電
極1を流れる。この時、ループ電極1がインダクタンス
L、ギャップ2がキャパシタンスCとしてLC共振器が
構成される。2. Description of the Related Art FIG. 1 shows a loop gap resonator and a resonance frequency adjusting mechanism described in Japanese Patent Publication No. 3-79670. As shown in FIG. 1, the loop gap resonator has a structure in which a loop-shaped electrode 1 is cut by a gap 2 parallel to an axis O of the loop, and is supplied through a coupling with an external antenna circuit. A wave current flows through the electrode 1. At this time, an LC resonator is configured such that the loop electrode 1 has the inductance L and the gap 2 has the capacitance C.
【0003】このループギャップ共振器の共振周波数
は、基本的にはループ長(ループの径)とギャップの大
きさ、すなわち形状によって決定されるが、共振器内部
に試料を配置することによって変化してしまう。そこ
で、この様な試料による共振周波数の変化に対応できる
ように共振器に共振周波数調整機構が備えられている。
すなわち、図1に示されているように、誘電体板3をギ
ャップ2に挿入することによりキャパシタンスCを変
え、共振周波数を変化させる機構である。誘電体を矢印
方向に移動させてギャップ内の誘電体挿入量を変化させ
ることにより、共振周波数を連続的に変化させることが
可能である。The resonance frequency of this loop gap resonator is basically determined by the loop length (diameter of the loop) and the size of the gap, that is, the shape. However, the resonance frequency is changed by disposing a sample inside the resonator. Would. Therefore, the resonator is provided with a resonance frequency adjusting mechanism so as to cope with such a change in the resonance frequency due to the sample.
That is, as shown in FIG. 1, a mechanism for changing the resonance frequency by changing the capacitance C by inserting the dielectric plate 3 into the gap 2. The resonance frequency can be changed continuously by moving the dielectric in the direction of the arrow to change the amount of dielectric inserted in the gap.
【0004】[0004]
【発明が解決しようとする課題】 この様な構成におい
て、生体試料など誘電損失の大きな試料を共振器に挿入
する場合、ループギャップ共振器の高さ(軸方向の長
さ)Hが大きいと、測定したい比較的狭い部位以外の部
位の誘電損失により共振器のQ値が大きく低下し、それ
に伴って共振周波数が大きく変化してしまうことは避け
られない。In such a configuration, when a sample having a large dielectric loss such as a biological sample is inserted into the resonator, if the height (length in the axial direction) H of the loop gap resonator is large, It is unavoidable that the Q value of the resonator is greatly reduced due to the dielectric loss at a portion other than the relatively narrow portion to be measured, and the resonance frequency is greatly changed accordingly.
【0005】その対策として、共振器の高さHを小さく
すると、Q値の低下及び共振周波数の変化は少なくなる
が、ギャップに誘電体を挿入して行う共振周波数の可変
範囲が狭くなってしまう。As a countermeasure, if the height H of the resonator is reduced, the reduction of the Q value and the change of the resonance frequency are reduced, but the variable range of the resonance frequency performed by inserting a dielectric into the gap is narrowed. .
【0006】本発明は上述した点に鑑みてなされたもの
であり、共振器の高さHを小さくしてQ値の低下及び共
振周波数の変化を少なくしても、共振周波数の可変範囲
を広くすることのできるループギャップ共振器を提供す
ることを目的としている。The present invention has been made in view of the above points, and even if the height H of the resonator is reduced to reduce the Q value and reduce the change in the resonance frequency, the variable range of the resonance frequency is widened. It is an object of the present invention to provide a loop gap resonator that can perform the above operations.
【0007】[0007]
【課題を解決するための手段】 この目的を達成するた
め、本発明は、ループ部分とギャップ部分を備えたルー
プギャップ共振器であって、ループ部分の軸方向の高さ
よりもギャップ部分の高さを大きくしたことを特徴とし
ている。In order to achieve this object, the present invention provides a loop gap resonator having a loop portion and a gap portion, wherein the height of the gap portion is higher than the height of the loop portion in the axial direction. It is characterized by having been enlarged.
【0008】[0008]
【発明の実施の形態】 以下、図面に基づいて本発明の
実施の形態を詳説する。図2は、本発明にかかるループ
ギャップ共振器の一例を示す断面図である。図2におい
て、ループギャップ共振器11は、シールド箱12内に
例えばフッ素樹脂製の固定爪13によって支持固定され
ている。ループギャップ共振器11は、所定幅,所定長
さの薄板電極の中央部をループ状に曲げると共に、ギャ
ップ14の部分で電極の両端部がギャップ延長電極15
としてループの外側へ向けて平行に突き出るように折り
曲げ加工されている。Embodiments of the present invention will be described below in detail with reference to the drawings. FIG. 2 is a sectional view showing an example of the loop gap resonator according to the present invention. In FIG. 2, the loop gap resonator 11 is supported and fixed in a shield box 12 by a fixing claw 13 made of, for example, a fluororesin. The loop gap resonator 11 bends a central portion of a thin plate electrode having a predetermined width and a predetermined length into a loop shape, and has both ends of a gap extension electrode 15 at a gap 14.
It is bent so as to protrude in parallel toward the outside of the loop.
【0009】このギャップ延長電極15の間に形成され
たギャップ内に、誘電体板16が挿入される。誘電体板
16は、支持板17の先端部にビスなどにより固定され
ており、シールド箱12の外から微動機構18によって
この支持板17を前進後退させることにより、ギャップ
内への誘電体板16の挿入量が調整される。A dielectric plate 16 is inserted into a gap formed between the gap extending electrodes 15. The dielectric plate 16 is fixed to the distal end of the support plate 17 with a screw or the like. The support plate 17 is advanced and retracted from the outside of the shield box 12 by the fine movement mechanism 18 so that the dielectric plate 16 is inserted into the gap. Is adjusted.
【0010】図3はループギャップ共振器11のみを抜
き出して描いた断面図及び側面図を示す。図から分かる
ように、この共振器は、ギャップ延長電極15の部分の
高さHG がループ部分の高さHL よりも大きく作られて
いる。FIG. 3 shows a sectional view and a side view of only the loop gap resonator 11 drawn. As can be seen from the figure, the height of the gap extending electrode 15 in this resonator is made larger than the height HL of the loop portion.
【0011】このように成せば、試料が挿入されるルー
プ部分の高さを小さくしても、ギャップ部の電極対向面
積が大きくなり、誘電体の挿入量を大きく可変できるた
め周波数可変範囲も広く取ることができる。With this configuration, even if the height of the loop portion into which the sample is inserted is reduced, the area of the gap portion facing the electrode is increased, and the amount of insertion of the dielectric can be varied greatly. Can be taken.
【0012】なお、上述した実施の形態では誘電体をル
ープギャップ共振器の中心軸に向けて前後動させたが、
図1に示されているように中心軸に沿う方向に移動させ
ても良いことは言うまでもない。In the above embodiment, the dielectric is moved back and forth toward the center axis of the loop gap resonator.
Needless to say, it may be moved in a direction along the central axis as shown in FIG.
【0013】図4はギャップ延長電極が無いループギャ
ップ共振器に本発明を適用した実施例を示している。FIG. 4 shows an embodiment in which the present invention is applied to a loop gap resonator having no gap extension electrode.
【0014】[0014]
【発明の効果】 以上詳述したように、本発明では、ギ
ャップ部分の高さをループ部分の高さよりも大きくした
ため、共振器の高さHを小さくしてQ値の低下及び共振
周波数の変化を少なくしても、共振周波数の可変範囲を
広くすることのできるループギャップ共振器が実現され
る。As described above in detail, according to the present invention, since the height of the gap portion is made larger than the height of the loop portion, the height H of the resonator is made smaller to lower the Q value and change the resonance frequency. , A loop gap resonator that can widen the variable range of the resonance frequency is realized.
【図1】 特公平3−79670号に記載されているル
ープギャップ共振器を示す図である。FIG. 1 is a diagram showing a loop gap resonator described in Japanese Patent Publication No. 3-79670.
【図2】 本発明を実施したループギャップ共振器の一
例を示す断面図である。FIG. 2 is a sectional view showing an example of a loop gap resonator embodying the present invention.
【図3】 図2の実施例において、ループギャップ共振
器11のみを抜き出して描いた断面図及び側面図を示す
図である。3A and 3B are a cross-sectional view and a side view illustrating only the loop gap resonator 11 in the embodiment of FIG.
【図4】 本発明をループ延長電極を持たないループギ
ャップ共振器に適用した例を示す図である。FIG. 4 is a diagram showing an example in which the present invention is applied to a loop gap resonator having no loop extension electrode.
11 ループギャップ共振器 12 シールド箱 13 固定爪 14 ギャップ 15 ギャップ延長電極 16 誘電体板 17 支持板 18 微動機構 Reference Signs List 11 loop gap resonator 12 shield box 13 fixing claw 14 gap 15 gap extension electrode 16 dielectric plate 17 support plate 18 fine movement mechanism
Claims (4)
プギャップ共振器であって、ループ部分の軸方向の高さ
よりもギャップ部分の高さを大きくしたことを特徴とす
るループギャップ共振器。1. A loop gap resonator comprising a loop portion and a gap portion, wherein the height of the gap portion is larger than the height of the loop portion in the axial direction.
に、該誘電体を移動させることにより共振周波数を調整
する共振周波数調整機構を備えたことを特徴とする請求
項1記載のループギャップ共振器2. The loop gap resonator according to claim 1, further comprising a resonance frequency adjusting mechanism for adjusting a resonance frequency by inserting a dielectric into the gap and moving the dielectric.
プ共振器の中心軸方向に移動されることを特徴とする請
求項2記載のループギャップ共振器。3. The loop gap resonator according to claim 2, wherein the dielectric is moved within the gap in a direction of a central axis of the loop gap resonator.
プ共振器の中心軸からの距離が変化する方向に往復動さ
せる方向に移動されることを特徴とする請求項2記載の
ループギャップ共振器。4. The loop gap resonator according to claim 2, wherein the dielectric is moved in a direction in which the distance from the center axis of the loop gap resonator changes within the gap.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP20695796A JP3401389B2 (en) | 1996-08-06 | 1996-08-06 | Loop gap resonator |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP20695796A JP3401389B2 (en) | 1996-08-06 | 1996-08-06 | Loop gap resonator |
Publications (2)
Publication Number | Publication Date |
---|---|
JPH1048304A true JPH1048304A (en) | 1998-02-20 |
JP3401389B2 JP3401389B2 (en) | 2003-04-28 |
Family
ID=16531819
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP20695796A Expired - Lifetime JP3401389B2 (en) | 1996-08-06 | 1996-08-06 | Loop gap resonator |
Country Status (1)
Country | Link |
---|---|
JP (1) | JP3401389B2 (en) |
-
1996
- 1996-08-06 JP JP20695796A patent/JP3401389B2/en not_active Expired - Lifetime
Also Published As
Publication number | Publication date |
---|---|
JP3401389B2 (en) | 2003-04-28 |
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