JPH11205082A - Package for antenna multicoupler - Google Patents
Package for antenna multicouplerInfo
- Publication number
- JPH11205082A JPH11205082A JP856498A JP856498A JPH11205082A JP H11205082 A JPH11205082 A JP H11205082A JP 856498 A JP856498 A JP 856498A JP 856498 A JP856498 A JP 856498A JP H11205082 A JPH11205082 A JP H11205082A
- Authority
- JP
- Japan
- Prior art keywords
- filter
- pattern
- branching
- substrate
- package
- 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.)
- Withdrawn
Links
Abstract
Description
【０００１】[0001]
【発明の属する技術分野】本発明は、空中線共用器のパ
ッケージに係り、特に、その分波線路の接続構造に関す
るものである。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a package for an antenna duplexer, and more particularly to a connection structure of a branching line.
【０００２】[0002]
【従来の技術】通信機のアンテナは、送信用と受信用を
共用する場合があり、この時アンテナを送信回路に接続
する場合と、受信回路に接続する場合とで切り替えをし
なければならず、この切り替えには、高周波用リレーや
ＰＩＮダイオードを使用したり、さらに４００ＭＨｚよ
り高い周波数に対しては、マイクロストリップ線路を用
いる方法がある。2. Description of the Related Art An antenna of a communication device may be used for both transmission and reception. At this time, it is necessary to switch between connecting the antenna to a transmission circuit and connecting the antenna to a reception circuit. For this switching, there is a method using a high-frequency relay or a PIN diode, or using a microstrip line for a frequency higher than 400 MHz.
【０００３】また、別の方法として、送信帯域、および
受信帯域の通過特性を有するバンドパスフィルタ２つを
並列に接続することで、空中先共用器を形成することが
できる。現在、市販されている携帯電話などの空中線共
用器には、誘電体フィルタを用いたものが多く使用され
ており、小型、軽量化などの目的から、ＳＡＷ（Ｓｕｒ
ｆａｃｅ Ａｃｏｕｓｔｉｃ Ｗａｖｅ：弾性表面波）
フィルタを用いた空中線共用器も実用化されつつある。As another method, an aerial duplexer can be formed by connecting two band-pass filters having pass characteristics of a transmission band and a reception band in parallel. At present, antenna duplexers such as mobile phones that are commercially available often use a dielectric filter, and are used for SAW (Sur.
face Acoustic Wave: surface acoustic wave
Antenna duplexers using filters are also being put into practical use.
【０００４】図３は一般的なＳＡＷフィルタを用いた空
中線共用器のブロック図である。この図に示すように、
アンテナ端１はアンテナへ、送信端２は送信回路へ、受
信端３は受信回路へ電気的に接続されており、さらに送
信帯域を通過域とするバンドパスフィルタ、つまり、Ｔ
ｘフィルタ４と、受信帯域を通過域とするバンドパスフ
ィルタ、つまりＲｘフィルタ５は、前記アンテナ端１に
対して並列接続される。また、並列接続点とＲｘフィル
タ５の間には、送信波がＲｘフィルタ５へ回り込むのを
防止するために、分波線路６が設けられている。FIG. 3 is a block diagram of an antenna duplexer using a general SAW filter. As shown in this figure,
The antenna end 1 is electrically connected to the antenna, the transmission end 2 is electrically connected to the transmission circuit, and the reception end 3 is electrically connected to the reception circuit.
The x filter 4 and a band pass filter having a reception band as a pass band, that is, an Rx filter 5 are connected in parallel to the antenna end 1. Further, a demultiplexing line 6 is provided between the parallel connection point and the Rx filter 5 in order to prevent a transmission wave from going to the Rx filter 5.
【０００５】図４は従来のＳＡＷフィルタの分波線路と
Ｒｘフィルタの構成図であり、図４（ａ）はその分波線
路とＲｘフィルタの平面図、図４（ｂ）は図４（ａ）の
Ａ−Ａ線断面図、図４（ｃ）は図４（ａ）のＢ−Ｂ線断
面の模式図である。これらの図に示すように、一般的に
分波線路６は、空中線共用器を形成する基板１１に、ス
トリップラインやマイクロストリップラインで構成さ
れ、パッケージングされたＲｘフィルタ５の信号パッド
７と分波線路６をハンダ付け部１０などで電気的に接続
する。基板１１の上面にはＧＮＤパターン９が形成さ
れ、Ｒｘフィルタ５のＧＮＤパッド８と接続される。さ
らに、基板１１には裏面パターン１２が形成され、分波
線路６の基準ＧＮＤとなる。FIG. 4 is a diagram showing the structure of a branching line and an Rx filter of a conventional SAW filter. FIG. 4 (a) is a plan view of the branching line and the Rx filter, and FIG. 4) is a cross-sectional view taken along the line AA, and FIG. 4C is a schematic view of a cross section taken along the line BB in FIG. As shown in these figures, the demultiplexing line 6 is generally formed on a substrate 11 forming an antenna duplexer by a strip line or a microstrip line, and is separated from the signal pad 7 of the packaged Rx filter 5. The wave line 6 is electrically connected by a soldering unit 10 or the like. A GND pattern 9 is formed on the upper surface of the substrate 11 and is connected to the GND pad 8 of the Rx filter 5. Further, a back surface pattern 12 is formed on the substrate 11 and serves as a reference GND for the branching line 6.
【０００６】[0006]
【発明が解決しようとする課題】しかしながら、上記し
た従来の分波線路の接続構造では、図４に示したよう
に、分波線路６と基板１１のＧＮＤパターン９の間や、
裏面ＧＮＤパターン１２の間、Ｒｘフィルタ５のＧＮＤ
パッド８の間などで浮遊容量が発生し、分波線路６のイ
ンピーダンスが設計値より低くなる傾向にある。これに
伴い、Ｒｘフィルタ５の通過域、および減衰域となる送
信帯域のインピーダンスも低くなることから、結果的に
送受信ともに挿入損失が大きくなるという問題点があっ
た。However, in the connection structure of the conventional branching line described above, as shown in FIG. 4, between the branching line 6 and the GND pattern 9 of the substrate 11,
Between the back GND pattern 12, the GND of the Rx filter 5
A stray capacitance occurs between the pads 8 and the like, and the impedance of the branching line 6 tends to be lower than a design value. As a result, the impedance of the transmission band, which is the pass band and the attenuation band of the Rx filter 5, also decreases, resulting in a problem that the insertion loss increases in both transmission and reception.
【０００７】このような分波線路６の浮遊容量によるイ
ンピーダンスの低下は、図５に示す一般的な分波線路の
モデルを考えると、容易に説明できる。図５（ａ）に示
すモデル１は分波線路６に浮遊容量がない状態を、図５
（ｂ）に示すモデル２は浮遊容量Ｃ１が分波線路６の途
中にある状態を示し、分波線路６をＬ１，Ｌ２のリアク
タンスに等価にしたとき、モデル１、モデル２のインピ
ーダンスをそれぞれＸ１，Ｘ２すると、 Ｘ１＝ＸＬ１＋ＸＬ２ Ｘ２＝ＸＬ１＋｛ＸＬ２×ＸＣ１／（ＸＣ１−ＸＬ
２）｝ となり、上記モデルの差分がインピーダンスの変化であ
ることから、 Ｘ１−Ｘ２＝ＸＬ２−｛ＸＬ２×ＸＣ１／（ＸＣ１−ＸＬ２）｝ ＝−ＸＬ２2 ／（ＸＣ１−ＸＬ２） ＝ｊω3 ×Ｌ２2 ×Ｃ１／（１＋ω2 ×Ｌ２×Ｃ１） ≧０ ただし、ＸＬ＝ｊωＬ ＸＣ＝１／ｊωＣ であるため、分波線路６に浮遊容量が発生すると、その
インピーダンスが低くなることが判る。The decrease in impedance due to the stray capacitance of the branching line 6 can be easily explained by considering a general branching line model shown in FIG. Model 1 shown in FIG. 5A shows a state where there is no stray capacitance in the branching line 6, and FIG.
Model 2 shown in (b) shows a state in which the stray capacitance C1 is in the middle of the branching line 6. When the branching line 6 is made equivalent to the reactances of L1 and L2, the impedances of the model 1 and the model 2 are respectively X1 and X2. , X2, X1 = XL1 + XL2 X2 = XL1 + ｛XL2 × XC1 / (XC1-XL
2)｝, and the difference between the above models is a change in impedance. X1-X2 = XL2- {XL2 × XC1 / (XC1-XL2)} = − XL2 2 / (XC1-XL2) = jω 3 × L2 2 × C1 / (1 + ω 2 × L2 × C1) ≧ 0 However, since XL = jωL XC = 1 / jωC, it is understood that the occurrence of stray capacitance in the branching line 6 lowers the impedance.
【０００８】本発明は、上記問題点を除去し、分波線路
が低いインピーダンスになることによる挿入損失の増大
を防止することができる空中線共用器のパッケージを提
供することを目的とする。An object of the present invention is to provide an antenna duplexer package which eliminates the above problems and can prevent an increase in insertion loss due to a low impedance of a branching line.
【０００９】[0009]
【課題を解決するための手段】本発明は、上記目的を達
成するために、 〔１〕ＳＡＷフィルタを複数内蔵する空中線共用器のパ
ッケージにおいて、分波回路パターンと通信端パターン
が形成されるとともに、裏面にＧＮＤパターンが形成さ
れる基板と、前記分波回路パターンと通信端パターン間
に配置されるとともに、側面にのみ形成される信号パッ
ドを有するＳＡＷフィルタと、前記分波回路パターンと
通信端パターンとその内側に位置する前記ＳＡＷフィル
タの信号パッド間を橋絡する半田付け部を設けるように
したものである。In order to achieve the above object, the present invention provides: [1] In a package of an antenna duplexer having a plurality of built-in SAW filters, a duplexer circuit pattern and a communication end pattern are formed. A substrate on which a GND pattern is formed on the back surface, a SAW filter disposed between the demultiplexing circuit pattern and the communication end pattern, and having a signal pad formed only on the side surface; A soldering portion for bridging between the pattern and the signal pad of the SAW filter located inside the pattern is provided.
【００１０】〔２〕上記〔１〕記載の空中線共用器のパ
ッケージにおいて、前記ＳＡＷフィルタは受信用フィル
タであり、通信端パターンは受信端パターンであり、前
記分波回路パターンは分波線路である。 〔３〕上記〔１〕記載の空中線共用器のパッケージにお
いて、前記ＳＡＷフィルタは送信用フィルタであり、通
信端パターンは送信端パターンであり、前記分波回路パ
ターンは送信用フィルタと受信用フィルタの並列接続線
パターンである。[2] In the antenna duplexer package according to [1], the SAW filter is a receiving filter, the communication end pattern is a receiving end pattern, and the branching circuit pattern is a branching line. . [3] In the antenna duplexer package according to [1], the SAW filter is a transmission filter, the communication end pattern is a transmission end pattern, and the branching circuit pattern is a transmission filter and a reception filter. It is a parallel connection line pattern.
【００１１】[0011]
【発明の実施の形態】以下、本発明の実施の形態につい
て詳細に説明する。図１は本発明の第１実施例を示す分
波線路の接続構造を示す図である。この図に示すよう
に、基板１１に形成されるとともに、Ｒｘフィルタ５と
接続される分波回路（分波線路パターン）２１、受信端
（受信端パターン）２２の接続部分を、Ｒｘフィルタ５
の外形直下に合わせるように短くし、さらに、Ｒｘフィ
ルタ５の信号パッド３１の基板１１に接する面の部分は
全面削除し、パッケージの端面部だけを残すようにす
る。Ｒｘフィルタ５と基板１１の接続は、図１（ｂ）に
示すように、分波回路（分波線路パターン）２１、もし
くは受信端（受信端パターン）２２と信号パッド３１の
側面部でのみ行われ、分波回路２１又は受信端２２とＲ
ｘフィルタ５の信号パッド３１との間は半田付け部３５
で橋絡する。Embodiments of the present invention will be described below in detail. FIG. 1 is a diagram showing a connection structure of a branching line according to a first embodiment of the present invention. As shown in this figure, the connection between the demultiplexing circuit (demultiplexing line pattern) 21 and the receiving end (receiving end pattern) 22 formed on the substrate 11 and connected to the Rx filter 5 is changed to the Rx filter 5.
, And the surface of the signal pad 31 of the Rx filter 5 in contact with the substrate 11 is entirely removed so that only the end face of the package is left. As shown in FIG. 1B, the connection between the Rx filter 5 and the substrate 11 is performed only at the side of the branching circuit (branching line pattern) 21 or the receiving end (receiving end pattern) 22 and the signal pad 31. And the demultiplexing circuit 21 or the receiving end 22 and R
A soldering portion 35 is provided between the x filter 5 and the signal pad 31.
Bridge.
【００１２】上記したように、本発明によれば、分波回
路２１の接続構造は、基板１１の分波回路２１、受信端
２２とＲｘフィルタ５の接続部分を短くし、さらにＲｘ
フィルタ５の信号パッド３１の基板１１に接する面の部
分を削除することにより、分波回路２１と基板１１のＧ
ＮＤパターン９の間や、裏面ＧＮＤパターン１２の間、
Ｒｘフィルタ５のＧＮＤパッド８の間などで発生する浮
遊容量を小さくすることができる。As described above, according to the present invention, the connection structure of the demultiplexing circuit 21 shortens the connection between the demultiplexing circuit 21 and the receiving end 22 of the substrate 11 and the Rx filter 5, and further reduces the Rx filter 5.
By removing the portion of the signal pad 31 of the filter 5 that is in contact with the substrate 11, the demultiplexing circuit 21 and the G of the substrate 11 are removed.
Between the ND patterns 9 and between the back GND patterns 12,
The stray capacitance generated between the GND pads 8 of the Rx filter 5 can be reduced.
【００１３】従って、分波回路２１のインピーダンス低
下に伴う挿入損失の増加を防止することが可能になる。
また、本発明の実施例では、基板１１の分波回路２１、
受信端２２とＲｘフィルタ５の接続部分を短く加工した
場合と、Ｒｘフィルタ５の信号パッド３１の基板１１に
接する面の部分を削除した場合を同時に実施している
が、このどちらか１つを実施しても、相当な効果が期待
できる。Accordingly, it is possible to prevent an increase in insertion loss due to a decrease in the impedance of the branching circuit 21.
In the embodiment of the present invention, the demultiplexing circuit 21 of the substrate 11
The case where the connection portion between the receiving end 22 and the Rx filter 5 is shortened and the case where the portion of the signal pad 31 of the Rx filter 5 which is in contact with the substrate 11 are deleted are performed at the same time. Even if implemented, a considerable effect can be expected.
【００１４】なお、評価では、基板１１の分波回路２
１、受信端２２とＲｘフィルタ５の接続部分を短く加工
した場合で、送信帯域の挿入損失が０．５１ｄＢ、受信
帯域の挿入損失が０．５１ｄＢ程度向上することが確認
できた。また、Ｒｘフィルタの通過域、および減衰域と
なる送信帯域のインピーダンスも低くなることから、結
果的に送受信ともに挿入損失が大きくなるのを有効に防
止することができる。In the evaluation, the demultiplexing circuit 2
1. It was confirmed that the insertion loss of the transmission band was improved by about 0.51 dB and the insertion loss of the reception band was improved by about 0.51 dB when the connection between the reception end 22 and the Rx filter 5 was shortened. Further, since the impedance in the transmission band, which is the pass band and the attenuation band of the Rx filter, is also reduced, it is possible to effectively prevent the insertion loss from being increased in both transmission and reception.
【００１５】図２は本発明の第２実施例を示す分波線路
の接続構造を示す図である。なお、第１実施例と同様の
部分については同じ符号を付してそれらの説明は省略す
る。この図に示すように、Ｔｘフィルタ４と送信端（送
信端パターン）４２の接続部や、分波回路であるＴｘフ
ィルタ４とＲｘフィルタ５の並列接続線〔（並列接続
点）（並列接続線パターン）〕４１とＴｘフィルタ４の
信号パッド５１と、送信端２２の信号パッド５１との接
続に関しても同様である。FIG. 2 is a diagram showing a connection structure of a demultiplexing line according to a second embodiment of the present invention. The same parts as those in the first embodiment are denoted by the same reference numerals, and description thereof is omitted. As shown in this figure, a connection portion between the Tx filter 4 and the transmission end (transmission end pattern) 42 and a parallel connection line [(parallel connection point) (parallel connection line) of the Tx filter 4 and the Rx filter 5, which are branching circuits. The same applies to the connection between the signal pad 41 of the Tx filter 4 and the signal pad 51 of the transmitting end 22.
【００１６】なお、本発明は上記実施例に限定されるも
のではなく、本発明の趣旨に基づいて種々の変形が可能
であり、これらを本発明の範囲から排除するものではな
い。It should be noted that the present invention is not limited to the above embodiment, and various modifications can be made based on the spirit of the present invention, and these are not excluded from the scope of the present invention.
【００１７】[0017]
【発明の効果】以上、詳細に説明したように、本発明に
よれば、次のような効果を奏することができる。分波回
路の接続構造は、基板の分波回路、受信端又は送信端と
ＳＡＷフィルタの接続部分を短くし、さらにＳＡＷフィ
ルタの信号パッドの基板に接する面の部分を削除したこ
とにより、分波回路と基板のＧＮＤパターンの間や、裏
面ＧＮＤパターンの間、ＳＡＷフィルタのＧＮＤパッド
の間などで発生する浮遊容量を小さくすることができ
る。よって、分波回路のインピーダンス低下に伴う挿入
損失の増加を防止することができる。As described above, according to the present invention, the following effects can be obtained. The connection structure of the demultiplexing circuit is achieved by shortening the connection between the demultiplexing circuit, the receiving end or the transmitting end of the substrate and the SAW filter, and removing the portion of the surface of the signal pad of the SAW filter that is in contact with the substrate. The stray capacitance generated between the GND pattern of the circuit and the substrate, between the GND patterns on the back surface, between the GND pads of the SAW filter, and the like can be reduced. Therefore, it is possible to prevent an increase in insertion loss due to a decrease in impedance of the branching circuit.
【００１８】また、基板の分波回路、受信端又は送信端
とＳＡＷフィルタの接続部分を短く加工した場合と、Ｓ
ＡＷフィルタの信号パッドの基板に接する面の部分を削
除した場合を同時に実施しているが、このどちらか１つ
を実施しても、相当な効果が期待できる。Also, the case where the demultiplexing circuit of the substrate, the connection between the reception end or the transmission end and the SAW filter is shortened,
Although the case where the portion of the surface of the signal pad of the AW filter that is in contact with the substrate is deleted is performed at the same time, a considerable effect can be expected by performing either one of them.
【図１】本発明の第１実施例を示す分波線路の接続構造
を示す図である。FIG. 1 is a diagram illustrating a connection structure of a branching line according to a first embodiment of the present invention.
【図２】本発明の第２実施例を示す分波線路の接続構造
を示す図である。FIG. 2 is a diagram illustrating a connection structure of a branching line according to a second embodiment of the present invention.
【図３】一般的なＳＡＷフィルタを用いた空中線共用器
のブロック図である。FIG. 3 is a block diagram of an antenna duplexer using a general SAW filter.
【図４】従来のＳＡＷフィルタの分波線路とＲｘフィル
タの構成図である。FIG. 4 is a configuration diagram of a branching line and an Rx filter of a conventional SAW filter.
【図５】一般的な分波線路のモデルを示す図である。FIG. 5 is a diagram illustrating a model of a general branching line.
４ Ｔｘフィルタ ５ Ｒｘフィルタ ８ ＧＮＤパッド ９ ＧＮＤパターン １１ 基板 １２ 裏面ＧＮＤパターン ２１ 分波回路（分波線路パターン） ２２ 受信端（受信端パターン） ３１，５１ 信号パッド ３５ 半田付け部 ４１ 並列接続線（並列接続線パターン） ４２ 送信端（送信端パターン） Reference Signs List 4 Tx filter 5 Rx filter 8 GND pad 9 GND pattern 11 Substrate 12 Backside GND pattern 21 Demultiplexing circuit (demultiplexing line pattern) 22 Receiving end (receiving end pattern) 31, 51 Signal pad 35 Solder part 41 Parallel connection line ( (Parallel connection line pattern) 42 Transmission end (transmission end pattern)
Claims (3)
用器のパッケージにおいて、（ａ）分波回路パターンと
通信端パターンが形成されるとともに、裏面にＧＮＤパ
ターンが形成される基板と、（ｂ）前記分波回路パター
ンと通信端パターン間に配置されるとともに、側面にの
み形成される信号パッドを有するＳＡＷフィルタと、
（ｃ）前記分波回路パターンと通信端パターンとその内
側に位置する前記ＳＡＷフィルタの信号パッド間を橋絡
する半田付け部を具備することを特徴とする空中線共用
器のパッケージ。1. A package of an antenna duplexer including a plurality of SAW filters, wherein: (a) a substrate on which a demultiplexing circuit pattern and a communication end pattern are formed and a GND pattern is formed on a back surface; A SAW filter disposed between the branching circuit pattern and the communication end pattern and having a signal pad formed only on the side surface;
(C) An antenna duplexer package comprising a soldering portion for bridging between the demultiplexing circuit pattern, the communication end pattern, and the signal pad of the SAW filter located inside thereof.
ジにおいて、前記ＳＡＷフィルタは受信用フィルタであ
り、通信端パターンは受信端パターンであり、前記分波
回路パターンは分波線路パターンであることを特徴とす
る空中線共用器のパッケージ。2. The antenna duplexer package according to claim 1, wherein the SAW filter is a receiving filter, the communication end pattern is a receiving end pattern, and the branching circuit pattern is a branching line pattern. Antenna duplexer package.
ジにおいて、前記ＳＡＷフィルタは送信用フィルタであ
り、通信端パターンは送信端パターンであり、前記分波
回路パターンは送信用フィルタと受信用フィルタの並列
接続線パターンであることを特徴とする空中線共用器の
パッケージ。3. The package of the antenna duplexer according to claim 1, wherein the SAW filter is a transmission filter, the communication end pattern is a transmission end pattern, and the branching circuit pattern is a transmission filter and a reception filter. An antenna duplexer package, characterized in that:
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP856498A JPH11205082A (en) | 1998-01-20 | 1998-01-20 | Package for antenna multicoupler |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP856498A JPH11205082A (en) | 1998-01-20 | 1998-01-20 | Package for antenna multicoupler |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH11205082A true JPH11205082A (en) | 1999-07-30 |
Family
ID=11696578
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP856498A Withdrawn JPH11205082A (en) | 1998-01-20 | 1998-01-20 | Package for antenna multicoupler |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH11205082A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2007005951A (en) * | 2005-06-22 | 2007-01-11 | Hitachi Media Electoronics Co Ltd | Transmission circuit, antenna duplexer, high frequency switch circuit |
-
1998
- 1998-01-20 JP JP856498A patent/JPH11205082A/en not_active Withdrawn
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2007005951A (en) * | 2005-06-22 | 2007-01-11 | Hitachi Media Electoronics Co Ltd | Transmission circuit, antenna duplexer, high frequency switch circuit |
| JP4636950B2 (en) * | 2005-06-22 | 2011-02-23 | 株式会社日立メディアエレクトロニクス | Transmission circuit, antenna duplexer, high-frequency switch circuit |
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