JPS5856501A - dielectric filter - Google Patents

PURPOSE:To miniaturize a dielectric filter, by separating resonance frequency adjusting screws and screw rods for coupling degree adjustment and arranging them on different surfaces. CONSTITUTION:A dielectric filter consists of a dielectric block 1, a case 5, resonance frequency adjusting screws 8 and coupling adjustment rods 10, and the rods 10 are arranged at the bottom of the case 5 through separation. A cover 7 has no screw holes for said rods 10 and the case 5 is provided with screw holes for the screw rods 10. Since the screw rods 10 had conventionally been provided to the cover 7, a fixing nut 101 for the screw rod 10 is brought into contact with a fixed nut for the screw 8, which was a great cause against the miniaturized filter. Thus, the screw rods 10 are screwed at the bottom of the case 5 and arranged through separation from the screws 8, allowing to miniaturize the dielectric filter.

【発明の詳細な説明】 本発明は、騎電体フイ、〜夕に係９゛、とく些、水形化
を実現するために調整部を改良した誘電体フィルタに関
するものである。DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a dielectric filter having an improved adjusting section in order to realize a water-shaped filter.

移動無線とくに車載無線等に使用される従来の誘電体フ
ィルタは、１個の誘電体ブロックに所定の間隔を介して
複数個の共振器用孔を並列して設け、鎖孔の内面を含ん
で誘電体ブロックの上面と両端面を除く外面にメタライ
ズするとともに、前記共撒器用孔間に結合度ｉｌ＆１袂
孔を並設した従来の誘電体フィルタを第１図に示す。図
において＠）は箱形筐体の蓋を除いた平面図、（ロ）は
正面の要部断の結合度調整孔１２を規則的にそれぞれ並
列に穿設してなる誘電体ブロック、２は共振器用孔１１
の内面に形成した導体膜、３は誘電体ブロックｌの上面
と両端面を除く外面に施された導体膜、４は誘電体ブロ
ックｌの両端面に設けた入出力結合用導体膜、５は金属
等からなり誘電体ブロックｌを収量ｌするケース、６は
入出力接栓、７はケース５の蕾であり、蓋７には誘電体
ブロック１の共振器用孔１１および結合度調整孔１２に
対応するそれぞれの調整ネジ８と結合１度調整用ネジ棒
９がイτ１設してあり、該調整ネジ８および調整用ネジ
棒９にはそれぞれ固定用ナラ）８１および９１を具備し
ている。Conventional dielectric filters used in mobile radios, especially in-vehicle radios, have a plurality of resonator holes arranged in parallel at predetermined intervals in one dielectric block. FIG. 1 shows a conventional dielectric filter in which the outer surface of the body block except for the upper surface and both end surfaces is metallized, and holes with a coupling degree of il & 1 are arranged in parallel between the holes for the recirculators. In the figure, @) is a plan view of the box-shaped casing with the lid removed, (b) is a dielectric block with coupling degree adjustment holes 12 regularly drilled in parallel in the main part of the front, and 2 is a Resonator hole 11
3 is a conductive film formed on the outer surface of the dielectric block l except for the top surface and both end faces, 4 is a conductive film for input/output coupling provided on both end faces of the dielectric block l, and 5 is a conductive film formed on the inner surface of the dielectric block l. A case made of metal etc. and containing a dielectric block l, 6 is an input/output connector, 7 is a bud of the case 5, and a lid 7 has holes for the resonator hole 11 and coupling adjustment hole 12 of the dielectric block 1. Corresponding adjustment screws 8 and one-time adjustment threaded rods 9 are provided at τ1, and the adjustment screws 8 and adjustment threaded rods 9 are provided with fixing nuts 81 and 91, respectively.

導体膜２．３および４はたとえば銀＋ガラスの粘性体を
塗布し、その後加熱するメタライズ法等により形成され
る。誘電体ブロック１に設けた入出力用導体膜４と入出
力用接栓６をそれぞれ接続し、誘電体ブロック１の孔１
１および１２に対応する共振周波数調整ネジ８と結合度
調整用ネジ棒９を具備した蓋７をケース５の上に載置し
固定する。かくして共振周波数調整ネジ８と結合度調整
用ネジ棒９をそれぞれ回動して、所定の周波数並びに結
合度に調整したるのち、固定用ナツ）８１および９１を
締付は固定する。・ところが移動無線（車載、携帯形）
等は小形軽量が強く要望されていることであるが、前記
固定用ナツ）８１および９１などの固定手段によってそ
の位置関係が限定されるために誘電体フィルタ自体を小
形化するこ゛とは困難な問題点があった。The conductor films 2.3 and 4 are formed, for example, by a metallization method in which a viscous material of silver and glass is applied and then heated. Connect the input/output conductor film 4 and the input/output plug 6 provided on the dielectric block 1, and
A lid 7 equipped with resonance frequency adjustment screws 8 corresponding to numbers 1 and 12 and a coupling degree adjustment threaded rod 9 is placed on the case 5 and fixed. After the resonance frequency adjusting screw 8 and the coupling degree adjusting threaded rod 9 are rotated to adjust the frequency and coupling degree to a predetermined value, the fixing nuts 81 and 91 are tightened and fixed.・However, mobile radio (vehicle-mounted, portable)
There is a strong demand for smaller and lighter filters, but it is difficult to miniaturize the dielectric filter itself because its positional relationship is limited by fixing means such as the fixing nuts 81 and 91. There was a point.

本発明の目的は、上記の問題点を改善すべく調整ネジ等
の調整手段を分割配置することに着目したものである。An object of the present invention is to focus on dividing and arranging adjusting means such as adjusting screws in order to improve the above-mentioned problems.

簡単に述べると、本発明は内導体をそなえた複数の共振
器用孔と該共振器用孔で構成さバる共振器間の結合度調
整孔を並夕１ルて所定に配設してなる誘電体ブロックと
、少なくも前記Ｍ［体ブロックの前記共振器用孔と結合
度調整孔の端面と対向する２面を有する筐体と、該筐体
の異なる一方の面に共振周波数調整ネジと他方の而に結
合度調整手段をそれぞれ設けたことを特徴とするもので
ある。以下図面を参照しながら本発明に係る誘電体フィ
ルタの実施例について畦細に説明する。Briefly stated, the present invention relates to a dielectric device comprising a plurality of resonator holes each having an inner conductor and holes for adjusting the degree of coupling between the resonators formed by the resonator holes arranged in a row in a predetermined manner. a body block, a housing having at least two surfaces facing the end faces of the resonator hole and the coupling adjustment hole of the body block, and a resonant frequency adjustment screw on one different side of the housing, Moreover, it is characterized in that it is provided with coupling degree adjusting means. Embodiments of the dielectric filter according to the present invention will be described in detail below with reference to the drawings.

第２図は、本発明の一実施例を説明するだめの正面の要
部断面図である。第２図において、この発明の誘電体フ
ィルタは、第１図と同様誘電体ブロック、ケース、共振
周波数調整ネジならびに結合度調整用ネジ棒等をそなえ
ているが、該結合度調整用ネジ棒９をケース５の底部に
分離して配置した点に特徴を有する。したがって結合度
調整用ネジ棒以外の部分は前回と同じ符号を付しており
、ここではこれらの部分の説明は省略するものとする。FIG. 2 is a sectional view of the main part of the front of the vessel for explaining one embodiment of the present invention. In FIG. 2, the dielectric filter of the present invention is equipped with a dielectric block, a case, a resonant frequency adjusting screw, a coupling degree adjusting threaded rod, etc. as in FIG. 1, but the coupling degree adjusting threaded rod 9 It is distinctive in that it is placed separately at the bottom of the case 5. Therefore, the parts other than the coupling degree adjustment threaded rod are given the same reference numerals as in the previous time, and the explanation of these parts will be omitted here.

しかし当然のことながら蓋７には結合度調整用ネジ棒用
のネジ孔はなく、ケース５には結合度調整用ネジ棒用の
ネジ孔が設けられている。本発明を特徴づける結合度調
整棒１０は従来蓋７に具備されていたので、結合度調艶
用ネジ棒１０の固定用ナツト１０１が、共振周波数調整
ネジ８の固定用ナツ）８１と接触するために小形化を妨
げる大きな原因となっていた。そこで結合度調整用ネジ
棒ｌＯをケース２の底部に螺合させて共振周波数調整ネ
ジ８と分離して配置したことにより誘電体フィルタの小
形化が可能となる。However, as a matter of course, the lid 7 does not have a screw hole for a screw rod for adjusting the degree of connection, and the case 5 has a screw hole for a screw rod for adjusting the degree of connection. Since the coupling degree adjusting rod 10 that characterizes the present invention was conventionally provided in the lid 7, the fixing nut 101 of the coupling degree adjusting threaded rod 10 comes into contact with the fixing nut 81 of the resonance frequency adjusting screw 8. This has been a major cause of hindering miniaturization. Therefore, by screwing the coupling degree adjustment threaded rod 10 into the bottom of the case 2 and arranging it separately from the resonance frequency adjustment screw 8, it is possible to downsize the dielectric filter.

なお、本実施例では＼波長の誘電体フィルタについて説
明したが、誘電体ブロックｌの表面にも導体膜を形成す
れば１４波長の誘電体フィルタとして適用が可能である
。また、共振周波数調整孔１１の内面にメタツイズした
導体＃２に変えて金属環等を用いても構わない。In this embodiment, a dielectric filter of \ wavelength has been described, but if a conductive film is also formed on the surface of the dielectric block l, it can be applied as a dielectric filter of 14 wavelengths. Further, a metal ring or the like may be used instead of the metal-twisted conductor #2 on the inner surface of the resonance frequency adjustment hole 11.

以Ｆの説明から明らかなように本発明に係る誘電体フィ
ルタによれば、共振周波数調整ネジと結合度調整用ネジ
棒を分割して異なる面に配置したことにより、小形化が
可能となるとともに軽量となるので、各樟移動無線機等
に適用して極めて有利である。As is clear from the explanation in F below, according to the dielectric filter according to the present invention, the resonant frequency adjustment screw and the coupling degree adjustment threaded rod are divided and placed on different surfaces, thereby making it possible to downsize the filter. Since it is lightweight, it is extremely advantageous to apply it to various mobile radios and the like.

なお、上述において本発明（こ係る周波数調整手段はネ
ジとしたが、これは誘電体ブロックの外部被膜とで構成
される共振器単位の共振器用孔に対する導体を遠近する
ための微調手段がその固定手段を含むものとの組み合せ
で外部から操作可能なものであれば、棒状体と緊締手段
が例えば押え金具等で達成される。同様なことが結合度
調整手段についても孔への挿入長を変化させるために全
く同様になし得るものである。In the above description, the present invention (this frequency adjustment means is a screw), but this means that the fine adjustment means for moving the conductor closer to or closer to the resonator hole of each resonator constituted by the outer coating of the dielectric block is the fixing means. If the rod-shaped body and the tightening means can be operated from the outside in combination with a means, the rod-shaped body and the tightening means can be achieved by, for example, a presser fitting.The same thing can be done for the degree of coupling means as well, by changing the insertion length into the hole. You can do exactly the same thing to make it happen.

また篩体が蓋との組み合せになる密閉ケースとしたが、
本発明においては最低限同一面以外の異なる２而にそれ
ぞれ周波数調整手段と結合度調整手段とを別個に設けれ
ばよいことであり、このようなことは両端面方向と一側
面のないコ溝形の取付台でなる筐体内に誘電体ブロック
を取り付けその対向２面にそれぞれ調整手段を設ければ
よいことであり、この場合入出力結合は周知の各種手段
、例えば同軸線路、リード線等でもってなし得ることで
ある。In addition, we created a sealed case in which the sieve body is combined with the lid,
In the present invention, it is only necessary to separately provide the frequency adjustment means and the coupling degree adjustment means on two different surfaces other than the same surface. All that is required is to install a dielectric block inside the housing, which is a shaped mounting base, and provide adjustment means on each of the two opposing sides. It is a welcome thing.

【図面の簡単な説明】[Brief explanation of the drawing]

第１図は従来の誘電体フィルタを説明するための（ａ）
は蓋を除いた平面図、（′ｂ）は正面の要部断面図。 第２図は本発明に係る誘電体フィルタの一実施例を説明
するための正面の要部断面図である。 図において、ｌは誘電体ブロック、ｓ、ｓ’ｈよび４は
導体膜、５はケース、６は入出力接栓、７は魚、８は共
振周波数調帖ネジ、９およびｌＯは結合度調整用ネジ棒
、１１は共振器用孔、１２は結合度調整孔、８１．９１
および１０１は固定用ナツト、を示す。 第１図 第２図 ′８Figure 1 is (a) for explaining a conventional dielectric filter.
is a plan view with the lid removed, and ('b) is a sectional view of the main part from the front. FIG. 2 is a front sectional view of a main part for explaining one embodiment of a dielectric filter according to the present invention. In the figure, l is a dielectric block, s, s'h and 4 are conductive films, 5 is a case, 6 is an input/output connector, 7 is a fish, 8 is a resonance frequency adjustment screw, 9 and lO are coupling degree adjustment 11 is a resonator hole, 12 is a coupling adjustment hole, 81.91
and 101 indicate a fixing nut. Figure 1 Figure 2 '8