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JP2004128132A - Electronic component for high frequency - Google Patents

Electronic component for high frequency Download PDF

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Publication number
JP2004128132A
JP2004128132A JP2002288705A JP2002288705A JP2004128132A JP 2004128132 A JP2004128132 A JP 2004128132A JP 2002288705 A JP2002288705 A JP 2002288705A JP 2002288705 A JP2002288705 A JP 2002288705A JP 2004128132 A JP2004128132 A JP 2004128132A
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Japan
Prior art keywords
laminated substrate
electronic component
case
frequency
laminated
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
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JP2002288705A
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Japanese (ja)
Inventor
Koichiro Kurihara
栗原 光一郎
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Proterial Ltd
Original Assignee
Hitachi Metals 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 Hitachi Metals Ltd filed Critical Hitachi Metals Ltd
Priority to JP2002288705A priority Critical patent/JP2004128132A/en
Publication of JP2004128132A publication Critical patent/JP2004128132A/en
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  • Shielding Devices Or Components To Electric Or Magnetic Fields (AREA)
  • Waveguide Switches, Polarizers, And Phase Shifters (AREA)

Abstract

<P>PROBLEM TO BE SOLVED: To provide electronic components for a high frequency where high-frequency radiation and influence from other electronic components for a high frequency are reduced. <P>SOLUTION: There are a rectangular laminated board 12, an electronic circuit formed by connecting a conductor pattern inside the laminated board 12, an electronic component 11 mounted to the surface of the laminated board 12, a ground electrode 100 having a spread formed near the rear of the laminated board 12 as one portion of the conductor pattern, a terminal electrode 101 formed on the back of the laminated board 12, and a case 10 that is mounted to the laminated board 12 and has conductivity for shielding electromagnetism. A top board and a sidewall extended from the top board are provided in the case 10, the case 10 surrounds the electronic component 11 and nearly the entire side of the laminated board 12, and the ground electrode 100 derived to the side of the laminated board 12 is electrically connected to the sidewall. <P>COPYRIGHT: (C)2004,JPO

Description

【0001】
【産業上の利用分野】
本発明は、携帯電話や、GPS(Global Positioning System)、無線LAN(Local Area Network)といった無線通信機器に用いられる電圧制御発信器、アンテナスイッチ、高周波増幅器等やこれらを一体化してモジュール化した高周波用電子部品に関するものである。
【0002】
【従来の技術】
前記無線通信機器の高周波回路部(RF回路)では数百MHz〜数GHzといった高周波信号を取り扱うが、無線通信機器を構成する部品のうち、内部に電子回路を具備した積層基板に電子部品を備えた高周波用電子部品では、図9に示すように部品自体から放射する高周波の低減のため、および他の部品からの高周波の影響による、誤動作や特性劣化を防止するため、基板に搭載された電子部品11を金属ケース10などで覆い、さらに前記金属ケース10をグランド端子と接続したシールド構造を取っている。
【0003】
前記図9は特許文献1に開示された高周波モジュールの外観斜視図であって、電子部品11を覆う様に天板と側壁を有する金属ケース10を有し、前記側壁の一部10c、10eを基板12の部品搭載面における基板端面に隣接した箇所に設けたグランド端子50にはんだ付けするとともに、他の側壁10b、10dを前記基板の側面に形成された凹部55に嵌合した高周波モジュールが開示されている。
【0004】
また特許文献2には、図10に示すように、セラミック基板12の一方主面上の電子回路を保護する金属キャップ10を配置した表面実装部品が開示されている。
【0005】
【特許文献1】特開平09−307261号
【特許文献2】特開平10−223787号
【0006】
【発明が解決しようとする課題】
しかしながら、従来の高周波用電子部品のように、基板上部に搭載された電子部品だけへのシールドだけでは、高周波用電子部品間の影響、更には、高周波用電子部品の実装領域全体から、高周波用電子部品以外への悪影響を十分低減することは不可能である。即ち、シールドされていない、露出しているセラミック部分から高周波が放射され、同時に他の高周波用電子部品からの影響を受けてしまう問題があった。
そこで本発明の目的は、高周波の放射や他の高周波用電子部品からの影響を低減した高周波用電子部品を提供することである。
【0007】
【課題を解決するための手段】
第1の発明は、矩形状の積層基板と、前記積層基板内部の導体パターンを接続して形成した電子回路と、前記積層基板の表面に搭載した電子部品と、前記導体パターンの一部として積層基板の裏面近傍に形成された広がりを有するグランド電極と、前記積層基板の裏面に形成された端子電極と、前記積層基板に取り付けられ電磁気を遮蔽する導電性を備えたケースを有し、
前記ケースは天板と前記天板から延長する側壁を備え、前記ケースで前記電子部品と積層基板の側面の略全面を囲み、前記積層基板の側面に導出された前記グランド電極と前記側壁とを電気的に接続した高周波用電子部品である。
ここで広がりを有するグランド電極とは、例えば積層基板内部でほぼ一平面を覆うように形成された導体パターンで構成され、電磁気的に遮蔽する効果を発揮するものである。このグランド電極は、前記遮蔽効果を発揮する範囲内で、一部の導体部分を切り欠いたり、開口させて形成しても良い。また前記ケースも遮蔽効果を発揮する範囲内で、一部の導体部分を切り欠いたり、開口させて形成しても良い。
前記ケースは例えばSPCCなどの金属材料で構成される。SPCC以外では、45Ni・Fe合金、Fe−Co合金などの磁気特性に優れるもので、その磁気特性は最大透磁率は5000以上で飽和磁束密度は1.4テスラ以上とすれば、外部との相互干渉の抑制効果がより発揮される。これらの金属材料は、100〜300μm程度に冷間圧延又は熱間圧延されている。さらに、その表面には、耐食の為にNiめっきが施され、さらにSnめっきを施すのが好ましい。また、銀、銅、金、アルミニウムなど電気抵抗率が5.5μΩcm以下の金属層や合金層を形成すると、特にはケース表面、すなわち最外層として形成すれば高周波用電子部品の電気的特性を向上させる場合があり好ましい。
積層基板の裏面に形成された端子電極は、高周波用電子部品が実装される回路基板との電気的かつ機械的な接続を行う為のものであり、回路基板との間で端子電極を介して積層基板内部の電子回路との接続や、積層基板上部に搭載されたダイオードや電界効果トランジスタなどの半導体素子へ電力供給する為の接続、前記グランド電極との接続が行なわれる。
【0008】
第2の発明は、矩形状の積層基板と、前記積層基板内部の導体パターンを接続して形成した電子回路と、前記積層基板の表面に搭載した電子部品と、前記導体パターンの一部として積層基板の裏面近傍に形成された広がりを有するグランド電極と、前記積層基板の裏面に形成された端子電極と、前記積層基板の側面の略全面に形成されたメタライジング層と、前記積層基板に取り付けられ電磁気を遮蔽する導電性を備えたケースを有し、
前記ケースは天板と前記天板から延長する側壁を備え、前記側壁が積層基板の側面に導出された前記グランド電極及びメタライジング層と電気的に接続する高周波用電子部品である。
本発明においては、前記遮蔽効果を発揮する範囲内で、メタライジング層の一部の導体部分を切り欠いたり、開口させて形成しても良い。
本発明においては、前記メタライジング層を、積層基板の側面に形成された銀または、銅の下層、前記下層表面に形成されたニッケルめっきの中間層、更に前記ニッケルめっき層の表面に形成された金めっき又はスズめっきの上層により構成するのが好ましい。
【0009】
第1又は第2の発明においては、ケースの側壁と積層基板との電気的接続を、はんだ付け又は、スポット溶接又は、導電性接着剤で行うのが好ましい。
そして、前記グランド電極と前記電子部品を搭載する積層基板の表面との間の積層基板内に形成された導体パターンと積層基板の裏面に形成された端子電極とは、積層基板内に形成されたスルーホールを介して接続する様に構成するのが好ましい。
【0010】
【作用】
本発明によれば、高周波用電子部品の端子電極を積層基板の裏面に形成し、他の5面を金属ケース、または金属ケースとメタライジング層によって覆い、さらに前記積層基板内に形成されたグランド電極と電気的に接続することで、積層基板内部の電子回路と、前記積層基板の表面に搭載した電子部品とが電磁気的な遮蔽箱内に存在することとなり、電子部品や電子回路からの高周波の放射や他の高周波部品からの電磁気的な影響を著しく低減することが出来る。
【0011】
【発明の実施の形態】
(実施例1)
高周波用電子部品としてアンテナスイッチを例にして本発明の実施例の説明を行う。
図1はアンテナスイッチの斜視図であり、図2は前記アンテナスイッチを構成するケースと積層基板とを分離して示した斜視図であり、図3は前記積層基板の分解斜視図である。
ここで例示したアンテナスイッチは、例えばGSM、PHS等のTDMA(時分割多元接続)方式の携帯電話に用いられるものであり、図4に示す回路ブロックのようにアンテナと受信回路、アンテナと送信回路との接続を電気的に切り替えるものである。このアンテナスイッチはλ/4伝送線路TL1、TL2とダイオードD1,D2を主要素子として構成されるものであり、例えば図5に示す等価回路のように構成される。積層基板の表面にダイオードやコンデンサ、抵抗などの電子部品11を搭載し、前記λ/4伝送線路を積層基板内に導体パターン110、111として形成した。積層基板12の裏面近傍に形成された広がりを有するグランド電極100を形成し、さらに積層基板の側面まで延出させている。積層基板の裏面には前記導体パターン110、111や電子部品11と積層基板内に形成されたスルーホール(図中黒丸で表示)を介して導通する端子電極150を備える。そして前記グランド電極のスルーホールが形成される部分を切り欠いたり、開口して形成した。
【0012】
積層基板12は、通常のセラミック積層部品の製造方法に基づいて行った。即ち、ドクターブレード法などの公知のシート化技術を用いてセラミックグリーンシートを形成し、複数枚のセラミックグリーンシートの表面に導体ペーストにて配線パターンを形成した。本実施例では銀ペーストを用いたが銅ペーストやその他の金属ペーストを適宜用いることが出来る。前記セラミックグリーンシートは各層間の導体パターンを接続するため、スルーホールも必要に応じて形成されている。前記印刷後のセラミックグリーンシートを、位置合わせを行って積層圧着した。前記積層圧着体で導体パターンが形成されていない表面にも同様に位置合わせを行い、スクリーン印刷で端子電極150を形成した。
前記積層圧着体を積層基板となる個片に切断した後、その側面下部に露出しているグランド電極100に、後工程でケース側壁と接合するための接続電極101を前記銀ペーストを溶剤で体積比2倍に希釈し、粘度を低下させたペーストを、塗出ニードル径0.1mmのディスペンサーを使用して、薄く塗布して形成した。しかる後、焼成セッターに配置し、連続炉で脱バインダー及び焼成を行った。焼成は大気雰囲気で900℃で1.5時間保持した。焼成後、無電解めっきにてニッケルめっきおよび金めっきを行い積層基板12とした。
そして、積層基板12の表面に形成された端子にはんだペーストをメタルマスクにて印刷塗布し、ダイオード、チップコンデンサなどの電子部品11を搭載した。
【0013】
また前記ケースは図6に示すように100μm厚みのSPCCシート状材をプレス加工機の金型内に配置し所定の形状に打ち抜き、絞り、切断、折り曲げ加工して形成した。図6(a)は展開図であり、図6(b)は斜視図である。ケース10には前記加工により、天板10aとそこから延長する側壁10b、10c、10e、10fを有し、その側壁に開孔部15を形成し、積層基板の端子電極105が形成された裏面を除く他の5面をほぼ覆うように構成されている。本実施例では積層基板12の外形に対してケース側壁10b、10c、10e、10fの片側クリアランスが50μmとなるようにした。なおケースの全面にはNiめっき膜とその上層にはんだめっき膜が形成されている。ケースケース
【0014】
そして積層基板12にケース10を覆いかぶせ、前記開口部15から積層基板側面の接続電極101にディスペンサーにてはんだペーストを塗布し、その状態で治具にセットし、リフロー炉にてはんだ付けし、ダイオード等の電子部品11とケース10を同時に積層基板12と接合した。前記はんだペースト中のはんだの粒径は20〜25μmのものを使用した。またディスペンサーによるはんだの塗布量は、接合後の過不足の状態を見て最適化を行った。本実施例においては電気的接続手段としてはんだ付けを用いたが、スポット溶接や、導電性接着剤などを用いて接続しても良い。
このようにして、積層基板の側面にまで延出したグランド電極100とケース10とを電気的に接続しアンテナスイッチのダイオード、コンデンサやλ/4伝送線路を電磁気的に遮蔽した空間に配置したことにより、アンテナスイッチからの高周波の放射や他の高周波部品からの電磁気的な影響を著しく低減することが出来た。
なお、積層基板の裏面を図3(b)に示すように、グランド電極105一面上に形成するのも本発明の範囲内である。
【0015】
(実施例2)
本発明に係る他の実施例を図7及び図8を用いて説明する。
積層圧着体を積層基板となる個片に切断する工程までは実施例1と同一なのでその説明を省く。積層圧着体を積層基板となる個片に切断した後、個片積層体の4側面全域と、電子部品実装面の一部に銀ペーストをスクリーン印刷し、しかる後、実施例1と同様に焼成し、めっき処理して、図8に示すように積層基板12の4側面を覆うメタラインジング層200と、積層基板の表面に前記メタラインジング層と連続する接続電極250とを有する積層基板を形成した。なお図8の積層基板12では電子部品を実装するための端子を省略して示している。ケース構造は側壁に開口を有さない点、積層基板の外形と略等しい、又はより小さいこと以外は実質的に実施例1のものと同一である。
電子部品を実装する端子(図示せず)と、その同一平面に形成された接続電極250とにはんだ印刷を行い、ダイオードなどの電子部品とケース10を搭載してはんだ付けした。本実施例においてもアンテナスイッチからの高周波の放射や他の高周波部品からの電磁気的な影響を著しく低減することが出来た。
【0016】
【発明の効果】
本発明によれば、簡便な方法により高周波用電子部品からの高周波の放射や他の部品からの電磁気的な影響を著しく低減することが出来た。
【図面の簡単な説明】
【図1】本発明の一実施例に係る高周波用電子部品の斜視図である。
【図2】本発明の一実施例に係る高周波用電子部品を構成するケースと積層基板とを分離して示した斜視図である。
【図3】本発明の一実施例に係る高周波用電子部品を構成する積層基板の分解斜視図である。
【図4】本発明の一実施例に係る高周波用電子部品の回路ブロックである。
【図5】本発明の一実施例に係る高周波用電子部品の等価回路である。
【図6】本発明の一実施例に係る高周波用電子部品を構成するケースの(a)展開図、(b)斜視図である。
【図7】本発明の他の実施例に係る高周波用電子部品の斜視図である。
【図8】本発明の他の実施例に係る高周波用電子部品を構成する積層基板の斜視図である。
【図9】従来の高周波用電子部品の斜視図である。
【図10】従来の他の高周波用電子部品の斜視図である。
【符号の説明】
1 高周波用電子部品
10 ケース
10a 天板
10b、10c、10e、10f 側壁
11 電子部品
12 積層基板
15 開口部
100 グランド電極
101 接続電極
150 端子電極
200 メタライジング層
[0001]
[Industrial applications]
The present invention relates to a voltage controlled oscillator, an antenna switch, a high-frequency amplifier, and the like, which are used in a wireless communication device such as a mobile phone, a GPS (Global Positioning System), and a wireless LAN (Local Area Network), and a high-frequency module in which these are integrated. Electronic components for electronic devices.
[0002]
[Prior art]
The high-frequency circuit section (RF circuit) of the wireless communication device handles high-frequency signals of several hundred MHz to several GHz, but among the components constituting the wireless communication device, electronic components are provided on a laminated substrate having an electronic circuit therein. As shown in FIG. 9, a high-frequency electronic component mounted on a substrate is used to reduce high-frequency radiation radiated from the component itself and to prevent malfunction and deterioration of characteristics due to the influence of high frequency from other components. The component 11 is covered with a metal case 10 or the like, and a shield structure is provided in which the metal case 10 is connected to a ground terminal.
[0003]
FIG. 9 is an external perspective view of the high-frequency module disclosed in Patent Document 1. The high-frequency module has a metal case 10 having a top plate and side walls so as to cover the electronic component 11. A high-frequency module is disclosed in which soldering is performed on a ground terminal 50 provided at a position adjacent to a substrate end surface on a component mounting surface of the substrate 12, and other side walls 10b and 10d are fitted into recesses 55 formed on side surfaces of the substrate. Have been.
[0004]
Patent Document 2 discloses a surface mount component in which a metal cap 10 for protecting an electronic circuit on one main surface of a ceramic substrate 12 is arranged as shown in FIG.
[0005]
[Patent Document 1] JP-A-09-307261 [Patent Document 2] JP-A-10-223787 [0006]
[Problems to be solved by the invention]
However, as in the case of conventional high-frequency electronic components, shielding only to the electronic components mounted on the upper part of the substrate alone will not affect the effects between the high-frequency electronic components, and further, the entire mounting area of the high-frequency electronic components will reduce It is impossible to sufficiently reduce adverse effects on components other than electronic components. That is, there is a problem that high frequency is radiated from an unshielded and exposed ceramic portion, and at the same time, is affected by other high frequency electronic components.
Accordingly, an object of the present invention is to provide a high-frequency electronic component in which high-frequency radiation and the influence of other high-frequency electronic components are reduced.
[0007]
[Means for Solving the Problems]
According to a first aspect of the present invention, a rectangular laminated substrate, an electronic circuit formed by connecting conductor patterns inside the laminated substrate, an electronic component mounted on a surface of the laminated substrate, and a laminate formed as part of the conductor pattern A ground electrode having a spread formed in the vicinity of the back surface of the substrate, a terminal electrode formed on the back surface of the laminated substrate, and a case provided with conductivity for shielding electromagnetic force attached to the laminated substrate,
The case includes a top plate and a side wall extending from the top plate, the case surrounds substantially the entire side surface of the electronic component and the laminated substrate, and the ground electrode and the side wall led out to the side surface of the laminated substrate. High-frequency electronic components that are electrically connected.
Here, the spread ground electrode is formed of, for example, a conductor pattern formed so as to cover substantially one plane inside the laminated substrate, and exhibits an effect of electromagnetically shielding. This ground electrode may be formed by cutting out or opening a part of the conductor portion within a range where the shielding effect is exhibited. Also, the case may be formed by cutting out or opening a part of the conductor portion as long as the case exhibits the shielding effect.
The case is made of, for example, a metal material such as SPCC. Other than SPCC, they have excellent magnetic properties such as 45Ni.Fe alloy and Fe-Co alloy. The magnetic properties are as follows: if the maximum magnetic permeability is 5000 or more and the saturation magnetic flux density is 1.4 Tesla or more, mutual interaction with the outside is possible. The effect of suppressing interference is more exhibited. These metal materials are cold-rolled or hot-rolled to about 100 to 300 μm. Further, the surface is preferably plated with Ni for corrosion resistance, and further preferably plated with Sn. In addition, when a metal layer or an alloy layer having an electrical resistivity of 5.5 μΩcm or less such as silver, copper, gold, and aluminum is formed, especially when formed as a case surface, that is, as an outermost layer, the electrical characteristics of high-frequency electronic components are improved. This may be preferable.
The terminal electrodes formed on the back surface of the laminated board are for making electrical and mechanical connection with the circuit board on which the high-frequency electronic components are mounted, and are connected to the circuit board via the terminal electrodes. Connection with an electronic circuit inside the multilayer substrate, connection for supplying power to a semiconductor element such as a diode or a field effect transistor mounted on the multilayer substrate, and connection with the ground electrode are performed.
[0008]
According to a second aspect of the present invention, a rectangular laminated substrate, an electronic circuit formed by connecting conductor patterns inside the laminated substrate, an electronic component mounted on a surface of the laminated substrate, and a laminate formed as part of the conductor pattern A ground electrode having a spread formed in the vicinity of the back surface of the substrate, a terminal electrode formed on the back surface of the laminated substrate, a metallizing layer formed on substantially the entire side surface of the laminated substrate, and attaching to the laminated substrate. Having a case with conductivity to shield the electromagnetic,
The case is a high-frequency electronic component that includes a top plate and a side wall extending from the top plate, and the side wall is electrically connected to the ground electrode and the metallizing layer led to the side surface of the multilayer substrate.
In the present invention, a part of the conductor portion of the metallizing layer may be cut or opened so long as the shielding effect is exhibited.
In the present invention, the metallizing layer is formed on a silver or copper layer formed on the side surface of the laminated substrate, an intermediate layer of nickel plating formed on the lower layer surface, and further formed on the surface of the nickel plating layer. It is preferable to form the upper layer of gold plating or tin plating.
[0009]
In the first or second invention, it is preferable that the electrical connection between the side wall of the case and the laminated substrate is made by soldering, spot welding, or a conductive adhesive.
The conductor pattern formed in the multilayer substrate between the ground electrode and the surface of the multilayer substrate on which the electronic component is mounted, and the terminal electrode formed on the back surface of the multilayer substrate are formed in the multilayer substrate. It is preferable that the connection is made through a through hole.
[0010]
[Action]
According to the present invention, the terminal electrode of the high-frequency electronic component is formed on the back surface of the laminated substrate, and the other five surfaces are covered with the metal case, or the metal case and the metallizing layer, and further the ground formed in the laminated substrate. By being electrically connected to the electrodes, the electronic circuit inside the multilayer substrate and the electronic components mounted on the surface of the multilayer substrate are present in the electromagnetic shielding box, and the high frequency Radiation and electromagnetic effects from other high-frequency components can be significantly reduced.
[0011]
BEST MODE FOR CARRYING OUT THE INVENTION
(Example 1)
An embodiment of the present invention will be described using an antenna switch as an example of a high-frequency electronic component.
FIG. 1 is a perspective view of an antenna switch, FIG. 2 is a perspective view showing a case constituting the antenna switch and a laminated substrate separately, and FIG. 3 is an exploded perspective view of the laminated substrate.
The antenna switch exemplified here is used for a TDMA (time division multiple access) type mobile phone such as GSM or PHS, and has an antenna and a receiving circuit, an antenna and a transmitting circuit as shown in a circuit block shown in FIG. The connection with the terminal is electrically switched. This antenna switch has λ / 4 transmission lines TL1 and TL2 and diodes D1 and D2 as main elements, and is configured, for example, as an equivalent circuit shown in FIG. Electronic components 11 such as diodes, capacitors, and resistors were mounted on the surface of the laminated substrate, and the λ / 4 transmission line was formed as conductive patterns 110 and 111 in the laminated substrate. A spread ground electrode 100 formed near the rear surface of the laminated substrate 12 is formed and further extended to the side surface of the laminated substrate. On the back surface of the laminated substrate, there are provided terminal electrodes 150 that are electrically connected to the conductor patterns 110 and 111 and the electronic component 11 through through holes (indicated by black circles in the figure) formed in the laminated substrate. Then, the portion of the ground electrode where the through hole was formed was cut out or opened.
[0012]
The laminated substrate 12 was formed based on a general method for manufacturing a ceramic laminated component. That is, a ceramic green sheet was formed using a known sheeting technique such as a doctor blade method, and a wiring pattern was formed on the surfaces of the plurality of ceramic green sheets using a conductive paste. In this embodiment, a silver paste is used, but a copper paste or another metal paste can be used as appropriate. In the ceramic green sheet, through holes are formed as necessary to connect conductor patterns between layers. The printed ceramic green sheets were aligned and laminated and pressed. Positioning was similarly performed on the surface of the laminated pressure-bonded body where no conductor pattern was formed, and the terminal electrode 150 was formed by screen printing.
After the laminated pressure-bonded body is cut into individual pieces to be a laminated substrate, a connection electrode 101 for bonding to a case side wall in a later step is applied to a ground electrode 100 exposed at a lower portion of the side surface of the silver paste with a solvent. The paste diluted to twice the ratio and reduced in viscosity was thinly applied using a dispenser having an application needle diameter of 0.1 mm to form a paste. Thereafter, it was placed in a firing setter, and debinding and firing were performed in a continuous furnace. The firing was maintained at 900 ° C. for 1.5 hours in an air atmosphere. After firing, nickel plating and gold plating were performed by electroless plating to obtain a laminated substrate 12.
Then, solder paste was printed and applied to the terminals formed on the surface of the laminated substrate 12 using a metal mask, and the electronic components 11 such as diodes and chip capacitors were mounted.
[0013]
As shown in FIG. 6, the case was formed by placing an SPCC sheet material having a thickness of 100 μm in a mold of a press machine, punching it into a predetermined shape, drawing, cutting, and bending. FIG. 6A is a development view, and FIG. 6B is a perspective view. The case 10 has a top plate 10a and side walls 10b, 10c, 10e, and 10f extending therefrom by the above-described processing. It is configured to substantially cover the other five surfaces except for. In this embodiment, the clearance on one side of the case side walls 10b, 10c, 10e, and 10f is set to 50 μm with respect to the outer shape of the laminated substrate 12. Note that a Ni plating film is formed on the entire surface of the case, and a solder plating film is formed thereon. Case Case [0014]
Then, the case 10 is covered on the laminated substrate 12, a solder paste is applied from the opening 15 to the connection electrode 101 on the side of the laminated substrate by a dispenser, set in a jig in that state, and soldered in a reflow furnace. The electronic component 11 such as a diode and the case 10 were simultaneously bonded to the laminated substrate 12. The particle size of the solder in the solder paste was 20 to 25 μm. In addition, the amount of the solder applied by the dispenser was optimized by checking the excess / deficiency state after joining. In this embodiment, soldering is used as the electrical connection means, but connection may be made using spot welding or a conductive adhesive.
In this way, the ground electrode 100 extending to the side surface of the laminated substrate and the case 10 are electrically connected to each other, and the diode, the capacitor, and the λ / 4 transmission line of the antenna switch are arranged in an electromagnetically shielded space. Thereby, high-frequency radiation from the antenna switch and electromagnetic effects from other high-frequency components can be significantly reduced.
Note that it is within the scope of the present invention to form the back surface of the laminated substrate on one surface of the ground electrode 105 as shown in FIG.
[0015]
(Example 2)
Another embodiment according to the present invention will be described with reference to FIGS.
The steps up to the step of cutting the laminated pressure-bonded body into individual pieces that become the laminated substrate are the same as those in the first embodiment, and thus description thereof will be omitted. After cutting the laminated pressure-bonded body into individual pieces to be laminated substrates, silver paste is screen-printed on all four side surfaces of the individual piece laminated body and a part of the electronic component mounting surface, and then fired in the same manner as in Example 1. Then, a plating process is performed to form a laminated substrate having a metallizing layer 200 covering four side surfaces of the laminated substrate 12 as shown in FIG. 8 and a connection electrode 250 continuous with the metallizing layer on the surface of the laminated substrate. Formed. In FIG. 8, terminals for mounting electronic components are omitted in the laminated substrate 12. The case structure is substantially the same as that of the first embodiment except that it has no opening in the side wall and is substantially equal to or smaller than the outer shape of the laminated substrate.
Solder printing was performed on terminals (not shown) for mounting electronic components and connection electrodes 250 formed on the same plane, and electronic components such as diodes and the case 10 were mounted and soldered. Also in this embodiment, it was possible to remarkably reduce high-frequency radiation from the antenna switch and electromagnetic effects from other high-frequency components.
[0016]
【The invention's effect】
According to the present invention, high-frequency radiation from high-frequency electronic components and electromagnetic effects from other components can be significantly reduced by a simple method.
[Brief description of the drawings]
FIG. 1 is a perspective view of a high-frequency electronic component according to an embodiment of the present invention.
FIG. 2 is a perspective view showing a case and a laminated substrate which constitute a high-frequency electronic component according to an embodiment of the present invention separately from each other.
FIG. 3 is an exploded perspective view of a laminated substrate constituting the high-frequency electronic component according to one embodiment of the present invention.
FIG. 4 is a circuit block diagram of a high-frequency electronic component according to one embodiment of the present invention.
FIG. 5 is an equivalent circuit of a high-frequency electronic component according to one embodiment of the present invention.
FIGS. 6A and 6B are a development view and a perspective view, respectively, of a case constituting a high-frequency electronic component according to an embodiment of the present invention.
FIG. 7 is a perspective view of a high-frequency electronic component according to another embodiment of the present invention.
FIG. 8 is a perspective view of a laminated substrate constituting a high-frequency electronic component according to another embodiment of the present invention.
FIG. 9 is a perspective view of a conventional high-frequency electronic component.
FIG. 10 is a perspective view of another conventional high-frequency electronic component.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 High frequency electronic component 10 Case 10a Top plate 10b, 10c, 10e, 10f Side wall 11 Electronic component 12 Multilayer substrate 15 Opening 100 Ground electrode 101 Connection electrode 150 Terminal electrode 200 Metallizing layer

Claims (5)

矩形状の積層基板と、前記積層基板内部の導体パターンを接続して形成した電子回路と、前記積層基板の表面に搭載した電子部品と、前記導体パターンの一部として積層基板の裏面近傍に形成された広がりを有するグランド電極と、前記積層基板の裏面に形成された端子電極と、前記積層基板に取り付けられ電磁気を遮蔽する導電性を備えたケースを有し、
前記ケースは天板と前記天板から延長する側壁を備え、前記ケースで前記電子部品と積層基板の側面の略全面を囲み、前記積層基板の側面に導出された前記グランド電極と前記側壁とを電気的に接続したことを特徴とする高周波用電子部品。
A rectangular laminated substrate, an electronic circuit formed by connecting conductor patterns inside the laminated substrate, an electronic component mounted on the front surface of the laminated substrate, and a part of the conductor pattern formed near the back surface of the laminated substrate. A ground electrode having a spread, a terminal electrode formed on the back surface of the laminated substrate, and a case provided with conductivity for shielding electromagnetic force attached to the laminated substrate,
The case includes a top plate and a side wall extending from the top plate, the case surrounds substantially the entire side surface of the electronic component and the laminated substrate, and the ground electrode and the side wall led out to the side surface of the laminated substrate. An electronic component for high frequency, which is electrically connected.
矩形状の積層基板と、前記積層基板内部の導体パターンを接続して形成した電子回路と、前記積層基板の表面に搭載した電子部品と、前記導体パターンの一部として積層基板の裏面近傍に形成された広がりを有するグランド電極と、前記積層基板の裏面に形成された端子電極と、前記積層基板の側面の略全面に形成されたメタライジング層と、前記積層基板に取り付けられ電磁気を遮蔽する導電性を備えたケースを有し、
前記ケースは天板と前記天板から延長する側壁を備え、前記側壁が積層基板の側面に導出された前記グランド電極及びメタライジング層と電気的に接続することを特徴とする高周波用電子部品。
A rectangular laminated substrate, an electronic circuit formed by connecting conductor patterns inside the laminated substrate, an electronic component mounted on the front surface of the laminated substrate, and a part of the conductor pattern formed near the back surface of the laminated substrate. And a terminal electrode formed on the back surface of the laminated substrate, a metallizing layer formed on substantially the entire side surface of the laminated substrate, and a conductive material attached to the laminated substrate and shielding electromagnetic waves. With a case with
The high-frequency electronic component according to claim 1, wherein the case includes a top plate and a side wall extending from the top plate, and the side wall is electrically connected to the ground electrode and the metallizing layer led to a side surface of the laminated substrate.
前記メタライジング層は、積層基板の側面に形成された銀または、銅の下層、前記下層表面に形成されたニッケルめっき中間層、更に前記ニッケルめっき中間層の表面に形成された金めっき又はスズめっきの上層により構成されていることを特徴とする請求項1に記載の高周波用電子部品。The metallizing layer is a silver or copper layer formed on the side surface of the laminated substrate, a nickel plating intermediate layer formed on the lower surface, and a gold plating or tin plating formed on the surface of the nickel plating intermediate layer. The high-frequency electronic component according to claim 1, wherein the high-frequency electronic component is configured by an upper layer. ケースの側壁と積層基板との電気的接続を、はんだ付け又は、スポット溶接又は、導電性接着剤で行うことを特徴とする請求項1乃至3のいずれかに記載の高周波用電子部品。The high-frequency electronic component according to any one of claims 1 to 3, wherein the electrical connection between the side wall of the case and the laminated substrate is performed by soldering, spot welding, or a conductive adhesive. 前記グランド電極と前記電子部品を搭載する積層基板の表面との間の積層基板内に形成された導体パターンと積層基板の裏面に形成された端子電極とは、積層基板内に形成されたスルーホールを介して接続することを特徴とする請求項1乃至4のいずれかに記載の高周波用電子部品。The conductor pattern formed in the laminated substrate between the ground electrode and the front surface of the laminated substrate on which the electronic component is mounted, and the terminal electrode formed on the back surface of the laminated substrate have through holes formed in the laminated substrate. The high-frequency electronic component according to any one of claims 1 to 4, wherein the high-frequency electronic component is connected via a wire.
JP2002288705A 2002-10-01 2002-10-01 Electronic component for high frequency Pending JP2004128132A (en)

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