JP3467959B2 - Low-pass filter with directional coupler and mobile phone - Google Patents
Low-pass filter with directional coupler and mobile phoneInfo
- Publication number
- JP3467959B2 JP3467959B2 JP06594896A JP6594896A JP3467959B2 JP 3467959 B2 JP3467959 B2 JP 3467959B2 JP 06594896 A JP06594896 A JP 06594896A JP 6594896 A JP6594896 A JP 6594896A JP 3467959 B2 JP3467959 B2 JP 3467959B2
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- stub
- directional coupler
- pass filter
- low
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Description
【０００１】[0001]
【発明の属する技術分野】本発明は、移動体通信の携帯
電話機の送信系回路として好適な方向性結合器付き低域
通過フィルタおよび携帯電話機に関するものである。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a low-pass filter with a directional coupler and a mobile phone suitable as a transmission system circuit of a mobile phone for mobile communication.
【０００２】[0002]
【従来の技術】図４に従来の携帯電話機の送信系のブロ
ック図を示す。電力増幅器ＰＡで増幅された電力からモ
ニタ信号を容量結合用コンデンサＣを介して取り出し、
アイソレータＩＳＯを介して低域通過フィルタＬＰＦを
接続し、モードスイッチＳＷが送信側にある時、システ
ムの２倍波スプリアス発振、および３倍波スプリアス発
振を取り除いて送信していた。2. Description of the Related Art FIG. 4 shows a block diagram of a transmission system of a conventional mobile phone. The monitor signal is taken out from the power amplified by the power amplifier PA via the capacitor C for capacitive coupling,
A low-pass filter LPF is connected via an isolator ISO, and when the mode switch SW is on the transmission side, the second harmonic spurious oscillation and the third harmonic spurious oscillation of the system are removed before transmission.
【０００３】[0003]
【発明が解決しようとする課題】しかしながら上記のよ
うな構成では、増幅されたシステムの２倍波スプリアス
発振、および３倍波スプリアス発振を十分に減衰させる
には低域通過フィルタＬＰＦの段数を増やす必要があ
り、またモードスイッチＳＷの投入位置にかかわらず反
射信号を防ぐ目的でアイソレータＩＳＯを接続している
ので価格が高くなるという問題点を有していた。However, in the above configuration, the number of stages of the low pass filter LPF is increased in order to sufficiently attenuate the second harmonic spurious oscillation and the third harmonic spurious oscillation of the amplified system. There is a problem that the cost is high because the isolator ISO is connected for the purpose of preventing the reflected signal regardless of the position where the mode switch SW is turned on.
【０００４】本発明は上記問題点に鑑み、高周波数帯域
を減衰、特にシステムの２倍波スプリアス発振、および
３倍波スプリアス発振を減衰させることができ、小型で
低価格の方向性結合器付き低域通過フィルタおよび携帯
電話機を提供することを目的とする。In view of the above problems, the present invention is capable of attenuating a high frequency band, in particular, attenuating the second-harmonic spurious oscillation and the third-harmonic spurious oscillation of a system, and is equipped with a small-sized and low-cost directional coupler. An object is to provide a low-pass filter and a mobile phone.
【０００５】[0005]
【課題を解決するための手段】上記問題点を解決するた
めに本発明は、モニタ信号を方向性結合器で取り出す構
成としてアイソレータを除去し、方向性結合器の主伝送
線路にスタブ線路を接続するという構成を備えたもので
ある。In order to solve the above problems, the present invention has a structure in which a monitor signal is taken out by a directional coupler, the isolator is removed, and a stub line is connected to the main transmission line of the directional coupler. It is equipped with a configuration that does.
【０００６】これにより所望の周波数帯域を減衰させ、
かつ従来の方向性結合器と同じ線路長で携帯電話機の送
信系の部品点数を少なくすることができる。As a result, the desired frequency band is attenuated,
Moreover, the number of components of the transmission system of the mobile phone can be reduced with the same line length as the conventional directional coupler.
【０００７】[0007]
【発明の実施の形態】本発明の請求項１に記載の発明
は、方向性結合器の主伝送線路の両端にスタブ線路を接
続し、 このスタブ線路を前記方向性結合器の主伝送線路
の線路長方向に配置し、 前記スタブ線路の一方を通過帯
域周波数の２倍波周波数で共振する周波数に設定し、前
記スタブ線路の他方を通過帯域周波数の３倍波周波数で
共振する周波数に設定して、前記３倍波周波数で共振す
るスタブ線路が接続された端子及び方向性結合器の副伝
送線路の両端子においてグランドとの間にコンデンサを
接続した構成とする方向性結合器付き低域通過フィルタ
であり、容量を調整することにより方向性結合器付き低
域通過フィルタのインピーダンス整合をとることができ
るという作用を有する。BEST MODE FOR CARRYING OUT THE INVENTION According to the first aspect of the present invention , stub lines are connected to both ends of a main transmission line of a directional coupler.
Next, connect this stub line to the main transmission line of the directional coupler.
Place the stub line in one of the
Set to the frequency that resonates at the second harmonic frequency of the region frequency,
On the other side of the stub line, at the third harmonic of the passband frequency
Set the frequency to resonate and resonate at the third harmonic frequency.
To the terminal to which the stub line is connected and the secondary transmission of the directional coupler.
Connect a capacitor between the ground and both terminals of the transmission line.
Connected low pass filter with directional coupler
, And the has an effect that it is possible to perform impedance matching of the low-pass filter with directional coupler by adjusting the capacitance.
【０００８】本発明の請求項２に記載の発明は、２倍波
周波数で共振するスタブ線路の線路幅よりも３倍波周波
数で共振するスタブ線路の線路幅を太く設定した構成と
する請求項１に記載の方向性結合器付き低域通過フィル
タであり、調整用のコンデンサ数を削減でき、また容量
の微調整を容易にする作用を有する。The invention according to claim 2 of the present invention is the second harmonic wave.
Frequency higher than the width of a stub line that resonates at a frequency
The configuration in which the line width of the stub line that resonates with the number is set thick
A low-pass filter with a directional coupler according to claim 1.
This has the effect of reducing the number of capacitors for adjustment and facilitating fine adjustment of capacitance.
【０００９】本発明の請求項３に記載の発明は、請求項
１または請求項２に記載の方向性結合器付き低域通過フ
ィルタを送信系回路に採用した携帯電話機であり、従来
の回路から部品点数を削減し小型、および低価格化を実
現する作用がある。The invention according to claim 3 of the present invention is a claim
The low-pass filter with a directional coupler according to claim 1 or 2.
This is a mobile phone that employs a filter as a transmission system circuit , and has the effect of reducing the number of parts and reducing the size and cost of the conventional circuit.
【００１０】以下、本発明の実施の形態について、図１
から図３を用いて説明する。FIG. 1 shows an embodiment of the present invention.
3 to FIG. 3 will be described.
【００１１】（実施の形態１）
図１は本発明の実施の形態１における方向性結合器付き
低域通過フィルタを示す。(First Embodiment) FIG. 1 shows a low-pass filter with a directional coupler according to a first embodiment of the present invention.
【００１２】図１において、両端を端子１０１および端
子１０２とする主伝送線路１０５と、両端を端子１０３
および端子１０４とする副伝送線路１０６とを下面をシ
ールド電極とした誘電体基板１０７に並行して配置す
る。前記主伝送線路１０５と前記副伝送線路１０６を電
磁界結合させ、前記端子１０４を５０Ω終端とし、さら
に主伝送線路１０５の端にコンデンサ４１０を、また副
伝送線路１０６の両端にコンデンサ４１１およびコンデ
ンサ４１２を接続して方向性結合器を形成する。In FIG. 1, a main transmission line 105 having terminals 101 and 102 at both ends and a terminal 103 at both ends.
The sub-transmission line 106 serving as the terminal 104 and the sub-transmission line 106 serving as the terminal 104 are arranged in parallel with the dielectric substrate 107 whose lower surface is a shield electrode. The main transmission line 105 and the sub transmission line 106 are electromagnetically coupled to each other, the terminal 104 is terminated with 50Ω, a capacitor 410 is provided at the end of the main transmission line 105, and a capacitor 411 and a capacitor 412 are provided at both ends of the sub transmission line 106. To form a directional coupler.
【００１３】前記誘電体基板１０７はアルミナで構成さ
れており、比誘電率が小さく伝送線路の特性インピーダ
ンスを大きくすることができ、方向性結合器の特性を良
くすることができる。Since the dielectric substrate 107 is made of alumina, it has a small relative permittivity and can increase the characteristic impedance of the transmission line, thereby improving the characteristics of the directional coupler.
【００１４】前記端子１０１および端子１０２にそれぞ
れスタブ線路２０８、スタブ線路２０９を接続する。こ
れらの伝送線路およびスタブ線路の形成方法はスクリー
ン印刷や集積回路基板作製用の凹版による方法などさま
ざまな方法が可能である。A stub line 208 and a stub line 209 are connected to the terminals 101 and 102, respectively. Various methods such as a screen printing method and an intaglio method for manufacturing an integrated circuit board can be used for forming the transmission line and the stub line.
【００１５】以上のように構成された方向性結合器付き
低域通過フィルタについて、以下その動作を説明する。The operation of the low-pass filter with a directional coupler configured as described above will be described below.
【００１６】本実施の形態の前記スタブ線路２０８およ
び前記スタブ線路２０９の接続点から見た入力インピー
ダンスＺiは線路の特性インピーダンスをＺ0、位相定数
をβ、線路長をｌ、および終端におけるインピーダンス
Ｚ1として損失を無視するとＺi＝Ｚ0・（Ｚ1＋ｊＺ0ｔ
ａｎβ1）／（Ｚ0＋ｊＺ1ｔａｎβ1）で表される。従っ
て、前記スタブ線路２０８および前記スタブ線路２０９
は線路の特性インピーダンス、終端条件、および線路長
により直列共振器として作用し、周波数特性において減
衰極を形成する。また前記主伝送線路１０５はインダク
タンスとして作用するので、本構成は前記主伝送線路１
０５の線路長をλ／４波長とする周波数を通過帯域周波
数（以下、ω0とする）とする２つの減衰極を有する低
域通過フィルタとして作用する。The input impedance Zi seen from the connection point of the stub line 208 and the stub line 209 of the present embodiment is defined by the characteristic impedance of the line Z0, the phase constant β, the line length l, and the impedance Z1 at the end. If the loss is ignored, Zi = Z0. (Z1 + jZ0t
An β1) / (Z0 + jZ1 tan β1). Therefore, the stub line 208 and the stub line 209
Acts as a series resonator depending on the characteristic impedance of the line, the termination condition, and the line length, and forms an attenuation pole in the frequency characteristic. Further, since the main transmission line 105 acts as an inductance, the present configuration has the main transmission line 1
It acts as a low-pass filter having two attenuation poles having a pass band frequency (hereinafter referred to as ω0) at a frequency of which the line length of 05 is λ / 4 wavelength.
【００１７】また、その両端にスタブ線路を接続して２
ω0もしくは３ω0で共振する直列共振器として作用させ
て２つの減衰極を有する低域通過周波数特性を得てい
る。このときω0帯域ではこれらの２つのスタブ線路は
容量性を示してπ型３段低域通過フィルタを構成してい
るが、２つのスタブ線路が示す容量成分は全く同じでは
ない。Also, connect stub lines to both ends of
By acting as a series resonator that resonates at ω0 or 3ω0, a low-pass frequency characteristic having two attenuation poles is obtained. At this time, in the ω0 band, these two stub lines show capacitance and form a π-type three-stage low-pass filter, but the capacitance components shown by the two stub lines are not exactly the same.
【００１８】前記スタブ線路２０８および前記スタブ線
路２０９が図１に示すようなオープンスタブ線路であ
り、それぞれが２ω0、３ω0で共振する場合、それらの
アドミタンスはＹ＝Ｙ0ｔａｎβ1（ただしＹ0＝１／Ｚ
0）で表され、低周波数で共振するオープンスタブ線路
のアドミタンスは高周波数で共振するオープンスタブ線
路のアドミタンスよりも大きくなる。従って、前記端子
１０１に作用する容量成分は前記端子１０２に作用する
容量成分よりも大きくなり、また前記端子１０３および
前記端子１０４に作用する容量成分はないので、方向性
結合器付き低域通過フィルタにおけるインピーダンスマ
ッチングは不整合となる。When the stub line 208 and the stub line 209 are open stub lines as shown in FIG. 1 and each resonates at 2ω0 and 3ω0, their admittance is Y = Y0tanβ1 (where Y0 = 1 / Z).
0), the admittance of an open stub line resonating at a low frequency is larger than that of an open stub line resonating at a high frequency. Therefore, the capacitance component acting on the terminal 101 is larger than the capacitance component acting on the terminal 102, and there is no capacitance component acting on the terminals 103 and 104, so a low-pass filter with a directional coupler is provided. The impedance matching at will be a mismatch.
【００１９】本実施の形態では前記コンデンサ４１０、
前記コンデンサ４１１、および前記コンデンサ４１２を
調整して容量を補正することにより、インピーダンス整
合のとれた低域通過フィルタを実現することができる。In the present embodiment, the capacitor 410,
By adjusting the capacitors 411 and 412 to correct the capacitance, a low-pass filter with impedance matching can be realized.
【００２０】好ましくは前記コンデンサ４１０の容量は
前記スタブ線路２０８の容量成分から前記スタブ線路２
０９の容量成分を引いた値とし、また前記コンデンサ４
１１および４１２の容量は前記スタブ線路２０８の容量
成分と同じ値とすることが望ましい。この場合はω0に
おいて最も整合がとれる状態となる。Preferably, the capacitance of the capacitor 410 is calculated from the capacitance component of the stub line 208.
The capacitance component of 09 is subtracted, and the capacitor 4
It is desirable that the capacitances of 11 and 412 have the same value as the capacitance component of the stub line 208. In this case, the best matching is obtained at ω0.
【００２１】なお、本実施の形態では前記スタブ線路２
０９で不足する容量を前記端子１０２に接続する前記コ
ンデンサ４１０で補正しているが、これはコンデンサを
接続するかわりに前記スタブ線路２０９の線路幅を前記
スタブ線路２０８の線路幅よりも太くすることで補正し
てもよい。この場合は部品点数を削減し、容量の微調整
を行うことができる効果がある。In this embodiment, the stub line 2 is used.
The capacity shortage in 09 is corrected by the capacitor 410 connected to the terminal 102. This is to make the line width of the stub line 209 larger than the line width of the stub line 208 instead of connecting the capacitor. You may correct with. In this case, there is an effect that the number of parts can be reduced and the capacity can be finely adjusted.
【００２２】また、本実施の形態におけるスタブ線路を
メアンダー線路、またはスパイラル線路、またはステッ
プトインピーダンス線路としてもよい。この場合は特性
を変えずに方向性結合器付き低域通過フィルタの大きさ
を小型化できる効果がある。Further, the stub line in the present embodiment may be a meander line, a spiral line, or a stepped impedance line. In this case, there is an effect that the size of the low-pass filter with a directional coupler can be reduced without changing the characteristics.
【００２３】前記主伝送線路１０５のうち前記スタブ線
路２０８と電磁界結合している部分を図２（ａ）に示す
ような結合伝送線路を用いた２開孔回路と考えると、そ
の等価回路は図２（ｂ）で表される。このとき、結合伝
送線路の偶モードインピーダンスをＺe、および奇モー
ドインピーダンスをＺ0とすると、前記主伝送線路１０
５の特性インピーダンスＺ1、および前記スタブ線路２
０８の特性インピーダンスＺ2はそれぞれ
Ｚ1＝（Ｚe＋Ｚ0）／２
Ｚ2＝（Ｚe／Ｚ0）・（Ｚe＋Ｚ0）／２
で表される。結合伝送線路の結合度を大きくする、すな
わちＺe−Ｚ0を大きくすると、上式から前記スタブ線路
２０８の特性インピーダンスＺ2が大きくなり、前記ス
タブ線路２０８が形成する減衰極の帯域幅が狭くなるこ
とが分かる。前記主伝送線路１０５と前記スタブ線路２
０９についても同様に、結合度を大きくすると、前記ス
タブ線路２０９が形成する減衰極の帯域幅が狭くなる。Considering the portion of the main transmission line 105 that is electromagnetically coupled to the stub line 208 as a two-hole circuit using a coupled transmission line as shown in FIG. 2A, its equivalent circuit is It is shown in FIG. At this time, if the even mode impedance of the coupled transmission line is Ze and the odd mode impedance is Z0, the main transmission line 10
Characteristic impedance Z1 of 5 and the stub line 2
The characteristic impedance Z2 of No. 08 is represented by Z1 = (Ze + Z0) / 2 Z2 = (Ze / Z0) .multidot. (Ze + Z0) / 2, respectively. When the coupling degree of the coupled transmission line is increased, that is, Ze-Z0 is increased, the characteristic impedance Z2 of the stub line 208 increases from the above equation, and the bandwidth of the attenuation pole formed by the stub line 208 may narrow. I understand. The main transmission line 105 and the stub line 2
Similarly, for 09, if the coupling degree is increased, the bandwidth of the attenuation pole formed by the stub line 209 is narrowed.
【００２４】従って本実施の形態では、前記主伝送線路
１０５の線路幅、前記スタブ線路２０８の線路幅および
両者の線路間隔、また前記主伝送線路１０５の線路幅、
前記スタブ線路２０９の線路幅および両者の線路間隔を
変えることで前記スタブ線路２０８および前記スタブ線
路２０９が形成する減衰極の帯域幅を制御することがで
きる。Therefore, in the present embodiment, the line width of the main transmission line 105, the line width of the stub line 208 and the line spacing between them, and the line width of the main transmission line 105,
The bandwidth of the attenuation pole formed by the stub line 208 and the stub line 209 can be controlled by changing the line width of the stub line 209 and the line spacing between them.
【００２５】（実施の形態２）
図３は本発明の実施の形態２における方向性結合器付き
低域通過フィルタを採用した携帯電話機の送信系の出力
回路を示す。図３において、前記端子１０１を電力増幅
器ＰＡに接続し、前記端子１０２をモードスイッチＳＷ
に接続し、前記端子１０３をモニタ端子とし、前記端子
１０４をそのまま５０Ω終端とする。(Embodiment 2) FIG. 3 shows an output circuit of a transmission system of a mobile phone adopting a low pass filter with a directional coupler according to Embodiment 2 of the present invention. In FIG. 3, the terminal 101 is connected to a power amplifier PA, and the terminal 102 is connected to a mode switch SW.
, The terminal 103 is used as a monitor terminal, and the terminal 104 is directly terminated as 50Ω.
【００２６】以上のように構成された携帯電話機の送信
系の出力回路について、その動作を説明する。The operation of the output circuit of the transmission system of the portable telephone configured as described above will be described.
【００２７】システムの信号は電力増幅器ＰＡにより増
幅され、方向性結合器付き低域通過フィルタおよびスイ
ッチＳＷを経てアンテナＡＮＴから送信される。このと
きシステムの高周波数帯域、特に２倍波スプリアス発
振、および３倍波スプリアス発振は方向性結合器付き低
域通過フィルタにより減衰し、アンテナには伝わらな
い。The system signal is amplified by the power amplifier PA, transmitted from the antenna ANT via the low pass filter with a directional coupler and the switch SW. At this time, the high frequency band of the system, especially the second harmonic spurious oscillation and the third harmonic spurious oscillation are attenuated by the low pass filter with the directional coupler and are not transmitted to the antenna.
【００２８】また方向性結合器によりモニタ信号を取り
出すことができる。Further, the monitor signal can be taken out by the directional coupler.
【００２９】以上のように本実施の形態によれば、本発
明の方向性結合器付き低域通過フィルタを採用すること
で携帯電話機の送信系の出力回路の部品点数を削減で
き、小型、および低価格化できる。As described above, according to the present embodiment, by adopting the low-pass filter with a directional coupler of the present invention, the number of components of the output circuit of the transmission system of the mobile phone can be reduced, and the size and size of the output circuit can be reduced. The price can be reduced.
【００３０】[0030]
【発明の効果】以上のように本発明によれば、方向性結
合器の主伝送線路にスタブ線路を接続することにより、
線路長を変えることなく所望の周波数帯域に減衰極を有
する低域通過フィルタの機能を併せ持つ部品を実現する
ことができる。またスタブ線路と主伝送線路を電磁界結
合させることにより、減衰極の帯域幅を制御することが
できる。また主伝送線路、および副伝送線路の両端をコ
ンデンサを介して接地することにより、方向性結合器付
き低域通過フィルタのインピーダンス整合をとることが
できる。また本発明の方向性結合器付き低域通過フィル
タを携帯電話機の送信系の出力回路に採用することで部
品点数の削減と小型、および低価格化を実現することが
できる。As described above, according to the present invention, by connecting the stub line to the main transmission line of the directional coupler,
It is possible to realize a component that also has the function of a low-pass filter having an attenuation pole in a desired frequency band without changing the line length. Also, the bandwidth of the attenuation pole can be controlled by electromagnetically coupling the stub line and the main transmission line. Further, by grounding both ends of the main transmission line and the sub transmission line via capacitors, impedance matching of the low pass filter with a directional coupler can be achieved. Further, by adopting the low-pass filter with a directional coupler of the present invention in the output circuit of the transmission system of a mobile phone, it is possible to reduce the number of parts, downsize, and reduce the cost.
【図１】本発明の実施の形態１における方向性結合器付
き低域通過フィルタの斜視図FIG. 1 is a perspective view of a low pass filter with a directional coupler according to a first embodiment of the present invention.
【図２】本発明の実施の形態１における主伝送線路およ
びスタブ線路の関係を示す説明図FIG. 2 is an explanatory diagram showing a relationship between a main transmission line and a stub line according to the first embodiment of the present invention.
【図３】本発明の実施の形態２における方向性結合器付
き低域通過フィルタを採用した携帯電話機の送信系のブ
ロック図FIG. 3 is a block diagram of a transmission system of a mobile phone adopting a low pass filter with a directional coupler according to a second embodiment of the present invention.
【図４】従来の携帯電話機の送信系のブロック図FIG. 4 is a block diagram of a transmission system of a conventional mobile phone.
１０１ 端子 １０２ 端子 １０３ 端子 １０４ 端子 １０５ 主伝送線路 １０６ 副伝送線路 １０７ 誘電体基板 ２０８ スタブ線路 ２０９ スタブ線路 ４１０ コンデンサ ４１１ コンデンサ ４１２ コンデンサ 101 terminal 102 terminals 103 terminal 104 terminal 105 Main transmission line 106 Sub transmission line 107 Dielectric substrate 208 stub track 209 stub tracks 410 capacitor 411 capacitor 412 capacitors
フロントページの続き (56)参考文献 特開 平２−131601（ＪＰ，Ａ) 特開 平３−155201（ＪＰ，Ａ) 実開 昭59−6304（ＪＰ，Ｕ) 特表 平６−501833（ＪＰ，Ａ) (58)調査した分野(Int.Cl.7，ＤＢ名) H01P 5/18 H01P 1/203 H04B 1/40 Continuation of the front page (56) Reference JP-A-2-131601 (JP, A) JP-A-3-155201 (JP, A) Actually open Sho-59-6304 (JP, U) Special table H6-501833 (JP , A) (58) Fields investigated (Int.Cl. 7 , DB name) H01P 5/18 H01P 1/203 H04B 1/40
Claims (3)
ブ線路を接続し、 このスタブ線路を前記方向性結合器の主伝送線路の線路
長方向に配置し、 前記スタブ線路の一方を通過帯域周波数の２倍波周波数
で共振する周波数に設定し、前記スタブ線路の他方を通
過帯域周波数の３倍波周波数で共振する周波数に設定し
て、前記３倍波周波数で共振するスタブ線路が接続され
た端子及び方向性結合器の副伝送線路の両端子において
グランドとの間にコンデンサを接続した構成とする方向
性結合器付き低域通過フィルタ。 1. A star is provided at both ends of a main transmission line of a directional coupler.
Connect the stub line to the main transmission line of the directional coupler.
Arrange in the long direction, and use one of the stub lines to double the passband frequency.
Set to a frequency that resonates with the other side of the stub line.
Set to a frequency that resonates at the third harmonic of the overband frequency
The stub line that resonates at the third harmonic frequency is connected.
At both terminals and the auxiliary transmission line terminals of the directional coupler
Direction of configuration with a capacitor connected to the ground
Low pass filter with sex coupler.
路幅よりも３倍波周波数で共振するスタブ線路の線路幅
を太く設定した構成とする請求項１に記載の方向性結合
器付き低域通過フィルタ。 2. A line of a stub line that resonates at a second harmonic frequency.
Line width of the stub line that resonates at the third harmonic frequency than the line width
The directional coupling according to claim 1, wherein is configured to be thick.
Low-pass filter with a filter.
結合器付き低域通過フィルタを送信系回路に採用した携
帯電話機。 3. Directionality according to claim 1 or claim 2.
A mobile phone that uses a low-pass filter with a coupler in the transmission circuit.
Mobile phone.
Priority Applications (7)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP06594896A JP3467959B2 (en) | 1996-03-22 | 1996-03-22 | Low-pass filter with directional coupler and mobile phone |
| DE1997630389 DE69730389T2 (en) | 1996-03-22 | 1997-03-14 | LOW PASS FILTER WITH DIRECTED COUPLER AND PORTABLE TELEPHONE THEREOF |
| KR1019970708344A KR100435801B1 (en) | 1996-03-22 | 1997-03-14 | Low-pass filter with directional coupler and portable telephone set using the same |
| US08/952,008 US6150898A (en) | 1996-03-22 | 1997-03-14 | Low-pass filter with directional coupler and cellular phone |
| PCT/JP1997/000815 WO1997036341A1 (en) | 1996-03-22 | 1997-03-14 | Low-pass filter with directional coupler and portable telephone set using the same |
| CNB971902399A CN100382384C (en) | 1996-03-22 | 1997-03-14 | Low-pass. filter with directional coupler and potable telephone set using the same |
| EP97907317A EP0828308B1 (en) | 1996-03-22 | 1997-03-14 | Low-pass filter with directional coupler and portable telephone set using the same |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP06594896A JP3467959B2 (en) | 1996-03-22 | 1996-03-22 | Low-pass filter with directional coupler and mobile phone |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH09260908A JPH09260908A (en) | 1997-10-03 |
| JP3467959B2 true JP3467959B2 (en) | 2003-11-17 |
Family
ID=13301716
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP06594896A Expired - Fee Related JP3467959B2 (en) | 1996-03-22 | 1996-03-22 | Low-pass filter with directional coupler and mobile phone |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP3467959B2 (en) |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP5708327B2 (en) * | 2011-07-13 | 2015-04-30 | 株式会社村田製作所 | Antenna device and communication terminal device |
| WO2023190781A1 (en) * | 2022-03-31 | 2023-10-05 | 株式会社村田製作所 | Communication module |
-
1996
- 1996-03-22 JP JP06594896A patent/JP3467959B2/en not_active Expired - Fee Related
Also Published As
| Publication number | Publication date |
|---|---|
| JPH09260908A (en) | 1997-10-03 |
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