JPS5940701A - Microwave filter - Google Patents

Microwave filter

Info

Publication number
JPS5940701A
JPS5940701A JP57150560A JP15056082A JPS5940701A JP S5940701 A JPS5940701 A JP S5940701A JP 57150560 A JP57150560 A JP 57150560A JP 15056082 A JP15056082 A JP 15056082A JP S5940701 A JPS5940701 A JP S5940701A
Authority
JP
Japan
Prior art keywords
input
filter
band
metallic
case
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.)
Pending
Application number
JP57150560A
Other languages
Japanese (ja)
Inventor
Hiroshi Saka
阪 博
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Panasonic Holdings Corp
Original Assignee
Matsushita Electric Industrial Co Ltd
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Matsushita Electric Industrial Co Ltd filed Critical Matsushita Electric Industrial Co Ltd
Priority to JP57150560A priority Critical patent/JPS5940701A/en
Publication of JPS5940701A publication Critical patent/JPS5940701A/en
Pending legal-status Critical Current

Links

Classifications

    • HELECTRICITY
    • H01ELECTRIC ELEMENTS
    • H01PWAVEGUIDES; RESONATORS, LINES, OR OTHER DEVICES OF THE WAVEGUIDE TYPE
    • H01P1/00Auxiliary devices
    • H01P1/20Frequency-selective devices, e.g. filters
    • H01P1/201Filters for transverse electromagnetic waves
    • H01P1/203Strip line filters
    • H01P1/20327Electromagnetic interstage coupling
    • H01P1/20354Non-comb or non-interdigital filters
    • H01P1/20363Linear resonators

Landscapes

  • Physics & Mathematics (AREA)
  • Electromagnetism (AREA)
  • Control Of Motors That Do Not Use Commutators (AREA)
  • Waveguides (AREA)

Abstract

PURPOSE:To improve the characteristics at a blocking band having a large insertion loss, by providing a metallic shield plate in a metallic case so as to separate an input and an output line between the input and the output line of the titled filter and preventing an irradiated wave from propagating in the metallic case. CONSTITUTION:The whole part of a band-pass filter 4 the input and outut lines 3 of which are coupled to a half wavelength microstrip line resonator 2 provided on a dielectric base 1, is made to contain in the metallic case 5. In figure, 6, 7 are the metallic shield plates and provided in the metallic case 5, and arranged on the dielectric base 1 so as to separate the input and output lines 3 and to bridge over the resonator 2. The insertion loss versus frequency characteristics in figure show an example of the characteristics of a band-pass filter having about 12.2GHz of center frequency f0 and comprising four-stage half wavelength microstrip line resonators and input and output lines, and solid lines indicate a conventional characteristic and dotted lines depict that of this invention. As seen clearly from figure, the insertion loss at the out-band at frequencies lower than fa( 11.2GHz) is improved to about 50dB, in case of this invention providing the metallic shield plates.

Description

【発明の詳細な説明】 産業上の利用分野 本発明は、マイクロストリップ線路を用いたマイクロ波
フィルタに関するものである。
DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application The present invention relates to a microwave filter using a microstrip line.

従来例の構成とその問題点 マイクロストリップ線路を用いたマイクロ波フィルタで
は輻射による輻射損を押えるためフィルタを金属ケース
内に収容するのが一般的である。
Conventional Structure and Problems In a microwave filter using a microstrip line, the filter is generally housed in a metal case in order to suppress radiation loss due to radiation.

第1図a、bidマイクロ波フィルタの従来による金属
ケース内の収容構造の一例を示すものである。aは断平
面図、bは断正面図である。誘電体基板1上に設けられ
た半波長マイクロストリップ線路共振器2に入出力線路
3が結合された帯域通過フィルタ4の゛全体が金属ケー
ス5内に収容されている。このようなフィルタの収容構
造では、入出力線路3から入力された信号の一部は入出
力線路3の開放端から輻射され、金属ケース6内を伝搬
し、そして再び入出力線路3と結合し忙入出力線路3か
ら出力される。従って、半波長マイクロストリップ線路
共振嬉2を介し入出力線路3間を伝搬する信号電力と、
入出力線路9間を輻射により直接伝搬してくる信号電力
とがほぼ等しくなる周波数fa、fb(ただし、fa<
fb)まではフィルタの帯域外特性は理論値に近い特性
が得られるが、中心周波数f。から遠く離れ、fa  
よりも低いか、fb  よりも高い周波数での帯域外特
性は理論に比べると劣化してしまう欠点があった。
FIG. 1a shows an example of a conventional housing structure for a bid microwave filter in a metal case. A is a cross-sectional plan view, and b is a cross-sectional front view. A bandpass filter 4 in which an input/output line 3 is coupled to a half-wavelength microstrip line resonator 2 provided on a dielectric substrate 1 is housed in a metal case 5 in its entirety. In such a filter housing structure, a part of the signal input from the input/output line 3 is radiated from the open end of the input/output line 3, propagates inside the metal case 6, and is coupled to the input/output line 3 again. It is output from the busy input/output line 3. Therefore, the signal power propagating between the input and output lines 3 via the half-wavelength microstrip line resonance 2,
Frequencies fa and fb at which the signal power directly propagating between the input and output lines 9 by radiation are approximately equal (however, fa<
Up to fb), the out-of-band characteristics of the filter are close to the theoretical values, but at the center frequency f. far away from fa
There was a drawback that the out-of-band characteristics at frequencies lower than fb or higher than fb were deteriorated compared to theory.

発明の目的 本発明はかかる従来の欠点を解消して、挿入損失の大き
い阻止域での特性を改善することのできるマイクロ波フ
ィルタを提供することを目的とするものである。
OBJECTS OF THE INVENTION It is an object of the present invention to provide a microwave filter that can eliminate such conventional drawbacks and improve characteristics in a stop band where insertion loss is large.

発明の構成 本発明においては、フィルタの阻止域での特性が劣化す
るのは金属ケース内を伝搬する輻射波がその原因である
ことを考慮して、フィルタの入出力線路間に入出力線路
を分離するように金属ケース内に金属遮蔽板を設け、輻
射波が金属ケース内を伝搬するのを防止するようにして
いる。
Structure of the Invention In the present invention, considering that the deterioration of the characteristics in the stopband of a filter is caused by radiation waves propagating inside the metal case, the input and output lines are connected between the input and output lines of the filter. A metal shielding plate is provided inside the metal case so as to separate the metal case from being propagated within the metal case.

実施例の説明 第2図に本発明の一実施例を示すOここで、第1図と同
一箇所には同一番号を付して説明するOaは助平面図、
bは断正面図である。誘電体基板1上に設けられた半波
長マイクロストリップ線路共振器2 K入出力線路3が
結合された帯域通過フィルタ4全体が金属ケース5内に
収容されている。
DESCRIPTION OF EMBODIMENTS One embodiment of the present invention is shown in FIG.
b is a sectional front view. A half-wavelength microstrip line resonator 2 provided on a dielectric substrate 1 and a bandpass filter 4 coupled with a K input/output line 3 are housed in a metal case 5 as a whole.

6.7は金属遮蔽板で、金属ケース5内に設けられ、入
出力線路3を分離するように、かつ半波長マイクロスト
リップ線路共振器2をまたぐようにして誘電体基板1上
に配置されている。
Reference numeral 6.7 denotes a metal shielding plate, which is provided in the metal case 5 and placed on the dielectric substrate 1 so as to separate the input/output line 3 and to straddle the half-wavelength microstrip line resonator 2. There is.

第3図は中心周波数f0 が約12.2 GHzで4段
の半波長マイクロストリップ線路共振器と入出力線路と
で構成された帯域通過フィルタの特性を測定した特性図
の一例で、実線は第1図の従来例による構成の場合の特
性を、点線は第2図の実施例のように金属遮蔽板を2箇
所に設けた時の特性を示す。第3図から明らかなように
、金属遮蔽板を設けた第2図の実施例の場合にはfa(
−111,2GHz)よりも低い周波数での帯域外特性
が挿入損失が約s o dBにまで改善されていること
がわかる。
Figure 3 is an example of a characteristic diagram obtained by measuring the characteristics of a bandpass filter that has a center frequency f0 of about 12.2 GHz and is composed of four stages of half-wavelength microstrip line resonators and input/output lines. The dotted line shows the characteristics in the case of the configuration according to the conventional example shown in FIG. 1, and the dotted line shows the characteristics when metal shielding plates are provided at two locations as in the embodiment shown in FIG. As is clear from FIG. 3, in the case of the embodiment of FIG. 2 in which a metal shielding plate is provided, fa(
It can be seen that the insertion loss of the out-of-band characteristics at frequencies lower than -111.2 GHz has been improved to about so dB.

第4図は本発明の別の実施例を示すもので、aは助平面
図、bは断正面図である。誘電体基板8上には入出力端
子9 、9”i結ぶ主線路10が設けられており、主線
路10には1/4波長終端開放スタブ11.12.13
が接続されていて、帯域阻止フィルタ14が形成されて
いる。15.16は金属遮蔽板でスタブ11.12.1
3を分離するように、かつ主線路10iまたぐようにし
て誘電体基板8上に配置されている。そして金属ケース
1ア内に帯域阻止フィルタ14および金属遮蔽板15.
16が収容されている。
FIG. 4 shows another embodiment of the present invention, in which a is an auxiliary plan view and b is a sectional front view. A main line 10 connecting input/output terminals 9 and 9"i is provided on the dielectric substrate 8, and the main line 10 has 1/4 wavelength open-ended stubs 11, 12, 13.
are connected to form a band rejection filter 14. 15.16 is a metal shield plate and stub 11.12.1
3 and straddles the main line 10i on the dielectric substrate 8. A band rejection filter 14 and a metal shielding plate 15 are disposed inside the metal case 1a.
16 are accommodated.

第4図の実施例においては、スタブ11.12゜13か
らの輻射波は金属遮蔽板15.16により金属ケース1
7内を伝搬することを妨げられるため、帯域阻止フィル
タ140入出力端子9,9′間を輻射波が直接伝搬する
ことが防止され、阻止帯域内での特性が改善されるよう
になる。
In the embodiment shown in FIG. 4, the radiation waves from the stubs 11.
Since the radiation wave is prevented from propagating within the band stop filter 140, the radiation wave is prevented from directly propagating between the input and output terminals 9 and 9' of the band stop filter 140, and the characteristics within the stop band are improved.

第6図は本発明の更に別の一実施例の助平面図であり、
特に金属遮蔽板の誘電体基板上への設置構造を示したも
のである。第6図(a)は第2図の実施例に、第6図(
b)は第4図の実施例に対応したもものであり、第2図
および第4図と同一箇所には同一番号を付して説明する
。誘電体基板1.8上にはフィルタ4,14が形成され
ているが、同時に、フィルタ4 、14’i構成する半
妖長マイクロストリップ線路共振器2やスタブ11,1
2.13の周辺にも誘電体基板1,8上の導体ランド1
8゜18’ 、 19 、19’が形成されている。そ
して導体ランド18 、18’、19 、19’に金属
遮蔽板e、7゜15.16がノ・ンタ−付けされている
。第5図の実施例では金属遮蔽板の固定がノ・ンダ付け
により容易に行なえるだけでなく、金属遮蔽板の形状や
位置の変更も容易にできる。
FIG. 6 is an auxiliary plan view of still another embodiment of the present invention,
In particular, it shows the installation structure of a metal shielding plate on a dielectric substrate. FIG. 6(a) shows the embodiment shown in FIG.
b) is a thigh corresponding to the embodiment of FIG. 4, and the same parts as in FIGS. 2 and 4 are given the same numbers and will be explained. Filters 4 and 14 are formed on the dielectric substrate 1.8, and at the same time, half-length microstrip line resonators 2 and stubs 11 and 1 that constitute the filters 4 and 14'i are formed.
2. Conductive lands 1 on dielectric substrates 1 and 8 also around 13.
8°18', 19, 19' are formed. Metal shielding plates e, 7.degree. 15.16, are provided with a 7.degree. In the embodiment shown in FIG. 5, not only can the metal shielding plate be easily fixed by soldering, but also the shape and position of the metal shielding plate can be easily changed.

発明の効果 このように、本発明によれば、次のような効果が得られ
る6 (1)マイクロ波フィルタの阻止帯域における特性が輻
射により劣化すること全防止することができる。
Effects of the Invention As described above, according to the present invention, the following effects can be obtained.6 (1) Deterioration of the characteristics in the stop band of the microwave filter due to radiation can be completely prevented.

(2)金属ケース内全伝搬してきた不要電波をも同時に
阻止することができる。
(2) It is possible to simultaneously block unnecessary radio waves that have propagated throughout the metal case.

(3)金属遮蔽板の構成が簡単か、つ単純であるため製
作が容易である。
(3) The structure of the metal shielding plate is simple and easy to manufacture.

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

第1図a、bは従来の一例の帯域通過形のマイクロ波フ
ィルタの助平面図および断正面図、第2図a、bは本発
明の一実施例におけるマイクロ波フィルタの助平面図お
よび断正面図、第3図は第1図と第2図のマイクロ波フ
ィルタによる挿入損失の周波数特性図、第4図a、bは
本発明の別の実施例におけるマイクロ波フィルタの助平
面図および断正面図、第6図a、bは本発明のさらに別
の実施例におけるマイクロ波フィルタの助平面図である
。 1・・・・・・誘電体基板、2・・・・・・共振器、3
・・・・・・入出力線路、4・・・・・・帯域通過フィ
ルタ、6・・・・・・金属ケース、6,7・・・・・・
金属遮蔽板、8・・・・・・誘電体基板、9.9′・・
・・・・入出力端子、10・・・・・・主線路、11・
。 12.13・・・・・・スタブ、14・・・・・・帯域
通過フィルタ、15.16・・・・・・金属遮蔽板、1
7・・・・・・金属ケース、18.18’、19.19
’・・・・・・導体ランド。 第1図 m2図 第3図 周 j反数 (CrHz)
1A and 1B are an auxiliary plan view and a sectional view of a conventional example of a bandpass type microwave filter, and FIGS. 2A and 2B are an auxiliary plan view and a sectional view of a microwave filter according to an embodiment of the present invention. 3 is a frequency characteristic diagram of insertion loss by the microwave filter of FIGS. 1 and 2, and FIG. The front view and FIGS. 6a and 6b are auxiliary plan views of a microwave filter in yet another embodiment of the present invention. 1... Dielectric substrate, 2... Resonator, 3
...Input/output line, 4...Band pass filter, 6...Metal case, 6,7...
Metal shielding plate, 8...Dielectric substrate, 9.9'...
...Input/output terminal, 10...Main line, 11.
. 12.13...Stub, 14...Band pass filter, 15.16...Metal shielding plate, 1
7...Metal case, 18.18', 19.19
'...Conductor land. Figure 1 m2 Figure 3 Circumference j inverse number (CrHz)

Claims (3)

【特許請求の範囲】[Claims] (1)誘電体上にマイ・クロストリップ線路を用いたフ
ィルタを形成し、前記フィルタの入出力端子間の少なく
とも1箇所に金属遮蔽板を設けたことを特徴とするマイ
クロ波フィルタ。
(1) A microwave filter characterized in that a filter using a microstrip line is formed on a dielectric material, and a metal shielding plate is provided at at least one location between input and output terminals of the filter.
(2)  フィルタを主線路とその主線路に設けられた
複数個の終端開放あるいは終端短絡スタブとで構成し、
金属遮蔽板を前記スタブ間に設けたことを特徴とする特
許請求の範囲第1項記載のマイクロ波フィルタ。
(2) The filter is composed of a main line and a plurality of open-terminated or short-terminated stubs provided on the main line,
2. The microwave filter according to claim 1, wherein a metal shielding plate is provided between the stubs.
(3)誘電体基体上にマイクロス) リップ線路とは別
に導体ランドを設け、この導体ランドに金属遮蔽板をハ
ンダ等により固着させたことを特徴とする特許請求の範
囲第1項記載のマイクロ波フィルータ0
(3) The micro micro as claimed in claim 1, characterized in that a conductor land is provided separately from the lip line on the dielectric substrate, and a metal shielding plate is fixed to the conductor land with solder or the like. wave filter 0
JP57150560A 1982-08-30 1982-08-30 Microwave filter Pending JPS5940701A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP57150560A JPS5940701A (en) 1982-08-30 1982-08-30 Microwave filter

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP57150560A JPS5940701A (en) 1982-08-30 1982-08-30 Microwave filter

Publications (1)

Publication Number Publication Date
JPS5940701A true JPS5940701A (en) 1984-03-06

Family

ID=15499542

Family Applications (1)

Application Number Title Priority Date Filing Date
JP57150560A Pending JPS5940701A (en) 1982-08-30 1982-08-30 Microwave filter

Country Status (1)

Country Link
JP (1) JPS5940701A (en)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS6197165U (en) * 1984-11-30 1986-06-21
JPS62109401A (en) * 1985-11-08 1987-05-20 Tokyo Keiki Co Ltd Ultra-high frequency filter
JPS62237801A (en) * 1986-04-09 1987-10-17 Matsushita Electric Ind Co Ltd Strip line filter
JPH036320U (en) * 1989-06-07 1991-01-22

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS6197165U (en) * 1984-11-30 1986-06-21
JPH0437096Y2 (en) * 1984-11-30 1992-09-01
JPS62109401A (en) * 1985-11-08 1987-05-20 Tokyo Keiki Co Ltd Ultra-high frequency filter
JPS62237801A (en) * 1986-04-09 1987-10-17 Matsushita Electric Ind Co Ltd Strip line filter
JPH036320U (en) * 1989-06-07 1991-01-22

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