JP4240662B2 - Mobile communication terminal - Google Patents

Mobile communication terminal Download PDF

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Publication number
JP4240662B2
JP4240662B2 JP19784699A JP19784699A JP4240662B2 JP 4240662 B2 JP4240662 B2 JP 4240662B2 JP 19784699 A JP19784699 A JP 19784699A JP 19784699 A JP19784699 A JP 19784699A JP 4240662 B2 JP4240662 B2 JP 4240662B2
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Japan
Prior art keywords
antenna
antennas
mobile communication
communication terminal
radiation pattern
Prior art date
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JP19784699A
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Japanese (ja)
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JP2001028560A (en
Inventor
清忠 横木
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Sony Corp
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Sony Corp
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Priority to JP19784699A priority Critical patent/JP4240662B2/en
Priority to TW089113430A priority patent/TW474074B/en
Priority to KR1020000039228A priority patent/KR100761227B1/en
Priority to CNB001286099A priority patent/CN1143453C/en
Publication of JP2001028560A publication Critical patent/JP2001028560A/en
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Publication of JP4240662B2 publication Critical patent/JP4240662B2/en
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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B7/00—Radio transmission systems, i.e. using radiation field
    • H04B7/02—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas
    • H04B7/04—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas
    • H04B7/08—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the receiving station
    • H04B7/0802—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the receiving station using antenna selection
    • H04B7/0817—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the receiving station using antenna selection with multiple receivers and antenna path selection
    • H04B7/082—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the receiving station using antenna selection with multiple receivers and antenna path selection selecting best antenna path
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01Q—ANTENNAS, i.e. RADIO AERIALS
    • H01Q3/00—Arrangements for changing or varying the orientation or the shape of the directional pattern of the waves radiated from an antenna or antenna system
    • H01Q3/26—Arrangements for changing or varying the orientation or the shape of the directional pattern of the waves radiated from an antenna or antenna system varying the relative phase or relative amplitude of energisation between two or more active radiating elements; varying the distribution of energy across a radiating aperture
    • H01Q3/2605—Array of radiating elements provided with a feedback control over the element weights, e.g. adaptive arrays
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01Q—ANTENNAS, i.e. RADIO AERIALS
    • H01Q21/00—Antenna arrays or systems
    • H01Q21/28—Combinations of substantially independent non-interacting antenna units or systems
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01Q—ANTENNAS, i.e. RADIO AERIALS
    • H01Q9/00—Electrically-short antennas having dimensions not more than twice the operating wavelength and consisting of conductive active radiating elements
    • H01Q9/04—Resonant antennas
    • H01Q9/0407—Substantially flat resonant element parallel to ground plane, e.g. patch antenna
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01Q—ANTENNAS, i.e. RADIO AERIALS
    • H01Q9/00—Electrically-short antennas having dimensions not more than twice the operating wavelength and consisting of conductive active radiating elements
    • H01Q9/04—Resonant antennas
    • H01Q9/30—Resonant antennas with feed to end of elongated active element, e.g. unipole

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  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Radio Transmission System (AREA)
  • Variable-Direction Aerials And Aerial Arrays (AREA)
  • Details Of Aerials (AREA)

Description

【０００１】
【発明の属する技術分野】
本発明は家庭内通信等に使用して好適な移動通信端末に関する。
【０００２】
【従来の技術】
従来、移動通信端末に図７及び図８に示す如きダイバーシティアンテナシステムが使用されている。この図７において、１は移動通信端末を示し、この移動通信端末１の筺体上に所定間隔離して２つの１／４波長（λ）のモノポールアンテナ２及び３を設け、このモノポールアンテナ２及び３の受信出力を図８に示す如く夫々受信機４及び５に供給して受信信号を得、この受信機４及び５よりの受信信号を夫々切替スイッチ６の一方及び他方の固定接点６ａ及び６ｂに供給する如くする。
【０００３】
また、この受信機４及び５の夫々の受信レベルを受信レベル比較器７に供給し、この受信レベル比較器７で受信レベルが大きい方を判断し、この判断に応じて、アンテナ切替器８により切替スイッチ６の可動接点６ｃを制御して、この可動接点６ｃを受信レベルの大きい受信信号が得られる固定接点６ａ及び６ｂに接続し、出力端子９に受信レベルの大きい方の受信信号を得、これを利用する如くしている。
【０００４】
この図７、図８の従来例は空間ダイバーシティ効果を得ようとするもので「アンテナの設置場所がある程度（１／４波長（λ）以上）離れているとフェージングを受ける様子は独立に変化する。」という事実を利用したものである。
【０００５】
この図７、図８に示す如きダイバーシティアンテナシステムを使用することにより、たまたま全てのアンテナ２，３がフェージングの谷に落ちていない限り良好な受信ができ、通信状態が悪い時間が大幅に短くなる。
【０００６】
【発明が解決しようとする課題】
ところで近年、家庭内で電波を利用して、種々の機器同士間で通信する家庭内通信所謂ホームネットワークが行われるようになっている。
斯る家庭内通信は同一フロアばかりでなく、１階と２階と等の上下階の通信が要求される。
【０００７】
斯る家庭内通信の移動通信端末に上述図７、図８に示す如きダイバーシティアンテナシステムを適用したときには、上述図７、図８のモノポールアンテナ２，３は夫々地面に対し水平方向に無指向性となる放射パターンを有するアンテナで空間ダイバーシティ効果を得るものであり、同一フロアのマルチパスには効果があるが、１階と２階と等の上下階間の通信には適さず良好な通信ができない不都合があった。
【０００８】
本発明は斯る点に鑑み、家庭用の上下階間の通信をも良好にできるようにした移動通信端末を提案せんとするものである。
【０００９】
【課題を達成するための手段】
本発明移動通信端末は、地面に対して水平方向で無指向性となる放射パターンを有する第１のアンテナと、地面に対して垂直方向上方で最大となる放射パターンを有する第２のアンテナと、地面に対して垂直方向下方で最大となる放射パターンを有する第３のアンテナと、この第１、第２及び第３のアンテナの各々から得られる受信強度情報により最適なアンテナを選択する選択手段とを具備するものである。
【００１２】
斯る本発明によれば、地面に対して垂直方向上方及び下方で夫々最大となる放射パターンを有するアンテナを設けているので、上下階間の通信をも良好に行うことができる。
【００１３】
【発明の実施の形態】
以下、図１〜図６を参照して本発明移動通信端末の実施の形態の例につき説明しよう。
【００１４】
図１において、１０は例えば家庭内通信に使用される移動通信端末を示し、この移動通信端末１０の筺体上に所定間隔離して、２つの１／４波長（λ）のモノポールアンテナ１１及び１２を設ける。
【００１５】
この家庭内通信の搬送波としては例えば２．４ＧＨｚ又は５．８ＧＨｚが使用される。
【００１６】
このモノポールアンテナ１１及び１２は夫々図４Ｂに示す如く地面に対して水平方向で無指向性となる放射パターンを有するアンテナであり、この２つのモノポールアンテナ１１及び１２により空間ダイバーシティ効果が得られる。この図４Ｂの指向性においては、アンテナ１１及び１２は夫々図４Ａの原点にあるものとする。後述する図５Ａ，Ｂの指向性についても同様である。
【００１７】
本例においては、この移動通信端末１０の筺体の上面に所定間隔離して、２つのパッチアンテナ１３及び１４を設けると共にこの移動通信端末１０の筺体の下面に所定間隔離して、２つのパッチアンテナ１５及び１６を設ける。
【００１８】
このパッチアンテナ１３，１４，１５及び１６は図２Ａ及びＢに示す如く、絶縁基板３０の上面に放射周波数に応じた径のアンテナ導体３１を設けると共にこの絶縁基板３０の下面に接地導体３２を被着したものである。
【００１９】
このパッチアンテナ１３，１４，１５及び１６は夫々図２Ａに、示す如くアンテナ導体３１側に最大放射パターン３３を有するものである。
【００２０】
従って、図１例においては、パッチアンテナ１３及び１４は夫々図５Ａに示す如く、地面に対して垂直方向上方で最大となる放射パターンを有するアンテナとなる。この２つのパッチアンテナ１３及び１４は夫々同一方向の指向性を持ち、空間ダイバーシティ効果が得られる。
【００２１】
また、この図１例においては、パッチアンテナ１５及び１６は夫々図５Ｂに示す如く、地面に対して垂直方向下方で最大となる放射パターンを有するアンテナとなる。この２つのパッチアンテナ１５及び１６は夫々同一方向の指向性を持ち、空間ダイバーシティ効果が得られる。
【００２２】
このモノポールアンテナ１１，１２、パッチアンテナ１３，１４，１５及び１６の受信出力を図３に示す如く、夫々受信機１７，１８，１９，２０，２１及び２２に供給して受信信号を得、この受信機１７，１８，１９，２０，２１及び２２よりの受信信号を夫々切替スイッチ２３の固定接点２３ａ，２３ｂ，２３ｃ，２３ｄ，２３ｅ及び２３ｆに夫々供給する如くする。
【００２３】
また、この受信機１７，１８，１９，２０，２１及び２２の夫々の受信レベルを受信レベル比較器２４に供給し、この受信レベル比較器２４で受信レベルが一番大きいのを判断し、この判断に応じて、アンテナ切替器２５により切替スイッチ２３の可動接点２３ｇを制御して、この可動接点２３ｇを受信レベルが一番大きい受信信号が得られる固定接点２３ａ，２３ｂ，２３ｃ，２３ｄ，２３ｅ又は２３ｆに接続し、出力端子２６に受信レベルの一番大きい安定した受信信号を得、これを利用する如くする。
【００２４】
斯る、図１及び図３に示す如き、本例においては、通信相手からの電波は、各アンテナ１１，１２，１３，１４，１５及び１６に入力され夫々の受信機１７，１８，１９，２０，２１及び２２で受信され受信信号が得られる。このとき電界強度即ち受信レベルが受信レベル比較器２４によって比較され、この受信レベルが一番大きいのを判断し、この判断に応じて、アンテナ切替器２５によって、一番電界強度の強い一番受信レベルの大きいアンテナで受信した受信信号を選択して出力端子に供給し、これを利用する如くする。
【００２５】
この場合、一般家庭における家庭内通信においては、図６Ａ，Ｂに示す如く同一階間、上下階間の通信即ち３次元空間における通信が予想され、上述本例を使用したときには、３次元空間における通信を考慮した放射パターンを有する複数のアンテナ即ち地面に対して水平方向で無指向性となる放射パターンを有するモノポールアンテナ１１及び１２と、地面に対して垂直方向上方で最大となる放射パターンを有するパッチアンテナ１３及び１４と、地面に対して垂直方向下方で最大となる放射パターンを有するパッチアンテナ１５及び１６との異なる３種類の放射パターンを有するアンテナの中から受信レベルの一番大きなアンテナの受信信号が選択され、指向性ダイバーシティ効果が得られ良好な通信を行うことができる。
【００２６】
また上述例では同一方向の放射パターンを有するアンテナの対、即ちモノポールアンテナ１１と１２、パッチアンテナ１３と１４、パッチアンテナ１５と１６とを設けたので夫々の対で空間ダイバーシティ効果も得ることができる。
【００２７】
尚、上述例ではアンテナ１１，１２，１３，１４，１５及び１６の全てに対し、夫々受信機１７，１８，１９，２０，２１及び２２を設けた例につき述べたが、アンテナ切替スイッチで選択した後に受信信号を受信機に供給するようにし、この受信機を共用するようにしても良いことは勿論である。
【００２８】
また上述例では、異なる３種の放射パターンのアンテナを２つづつ設けた例につき述べたが、これは１つであって良いし、また３つ以上であっても良い。
【００２９】
また、本発明は上述例に限ることなく本発明の要旨を逸脱することなく、その他種々の構成が採り得ることは勿論である。
【００３０】
【発明の効果】
本発明によれば３次元空間における通信を考慮した放射パターンを有する複数個のアンテナを具備し、受信レベルを判断して、最適なアンテナを選択するようにしているので、指向性ダイバーシティ効果が得られ、例えば家庭内において、上下階間での通信等の３次元空間において良好な通信が実現できる。
【図面の簡単な説明】
【図１】本発明ダイバーシティアンテナシステムの実施の形態の例を示す構成図である。
【図２】パッチアンテナの例を示し、Ａは断面図、Ｂは斜視図である。
【図３】図１例のブロック図である。
【図４】本発明の説明に供する線図である。
【図５】本発明の説明に供する線図である。
【図６】本発明の説明に供する線図である。
【図７】従来のダイバーシティアンテナシステムの例を示す構成図である。
【図８】図７のブロック図である。
【符号の説明】
１０‥‥移動通信端末、１１，１２‥‥モノポールアンテナ、１３，１４，１５，１６‥‥パッチアンテナ、１７，１８，１９，２０，２１，２２‥‥受信機、２３‥‥切替スイッチ、２４‥‥受信レベル比較器、２５‥‥アンテナ切替器、２６‥‥出力端子[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a suitable mobile communications terminal using the home communication.
[0002]
[Prior art]
Conventionally, a diversity antenna system as shown in FIGS. 7 and 8 is used in a mobile communication terminal. In FIG. 7, reference numeral 1 denotes a mobile communication terminal. On the housing of the mobile communication terminal 1, two quarter-wave (λ) monopole antennas 2 and 3 are provided at predetermined intervals, and the monopole antenna 2 And 3 are supplied to receivers 4 and 5, respectively, as shown in FIG. 8 to obtain received signals, and the received signals from the receivers 4 and 5 are sent to one and the other fixed contacts 6a and 6 of the selector switch 6, respectively. Supply to 6b.
[0003]
Further, the reception levels of the receivers 4 and 5 are supplied to the reception level comparator 7, and the reception level comparator 7 determines whether the reception level is higher, and according to this determination, the antenna switch 8 The movable contact 6c of the changeover switch 6 is controlled, and the movable contact 6c is connected to the fixed contacts 6a and 6b from which a reception signal with a large reception level is obtained, and the reception signal with the larger reception level is obtained at the output terminal 9, This is used.
[0004]
The conventional examples of FIG. 7 and FIG. 8 are intended to obtain a spatial diversity effect. “If the antenna is placed at a certain distance (1/4 wavelength (λ) or more), the state of fading changes independently. "" Is used.
[0005]
By using the diversity antenna system as shown in FIG. 7 and FIG. 8, good reception is possible unless all the antennas 2 and 3 happen to fall into the fading valley, and the communication time is greatly shortened. .
[0006]
[Problems to be solved by the invention]
By the way, in recent years, home communication so-called home networks have been performed in which various devices communicate with each other using radio waves in the home.
Such in-home communication requires not only communication on the same floor, but communication on the upper and lower floors such as the first and second floors.
[0007]
When the diversity antenna system as shown in FIGS. 7 and 8 is applied to such a mobile communication terminal for home communication, the monopole antennas 2 and 3 in FIGS. 7 and 8 are omnidirectional in the horizontal direction with respect to the ground. The antenna with the radiation pattern that makes it possible to obtain a spatial diversity effect, which is effective for multipath on the same floor, but is not suitable for communication between upper and lower floors such as the first floor and the second floor, and good communication There was an inconvenience that could not be.
[0008]
In view of the斯Ru point, but also to St. proposed mobile communications terminal to allow good communication between the upper and lower floors of the household.
[0009]
[Means for achieving the object]
The mobile communication terminal of the present invention includes a first antenna having a radiation pattern that is omnidirectional in the horizontal direction with respect to the ground, a second antenna having a radiation pattern that is maximized in the vertical direction above the ground, A third antenna having a maximum radiation pattern vertically below the ground; and a selection means for selecting an optimum antenna based on reception intensity information obtained from each of the first, second, and third antennas. It comprises.
[0012]
According to the present invention, since the antenna having the maximum radiation pattern is provided vertically above and below the ground, communication between the upper and lower floors can be performed satisfactorily.
[0013]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, an example of an embodiment of the mobile communication terminal of the present invention will be described with reference to FIGS.
[0014]
In FIG. 1, reference numeral 10 denotes a mobile communication terminal used for home communication, for example. Two quarter-wave (λ) monopole antennas 11 and 12 are separated from each other on a housing of the mobile communication terminal 10 by a predetermined distance. Is provided.
[0015]
For example, 2.4 GHz or 5.8 GHz is used as a carrier wave for home communication.
[0016]
The monopole antenna 11 and 12 is an antenna having a radiation pattern becomes omnidirectional in the horizontal direction with respect to the ground as shown in each Figure 4B, the space Diversity effect by the two monopole antennas 11 and 12 can get. In the directivity of FIG. 4B, it is assumed that the antennas 11 and 12 are at the origin of FIG. 4A. The same applies to the directivity of FIGS. 5A and 5B described later.
[0017]
In this example, two patch antennas 13 and 14 are provided on the upper surface of the housing of the mobile communication terminal 10 by a predetermined distance, and two patch antennas 15 are provided on the lower surface of the mobile communication terminal 10 by a predetermined distance. And 16 are provided.
[0018]
As shown in FIGS. 2A and 2B, the patch antennas 13, 14, 15 and 16 are provided with an antenna conductor 31 having a diameter corresponding to the radiation frequency on the upper surface of the insulating substrate 30 and covered with a ground conductor 32 on the lower surface of the insulating substrate 30. It is what I wore.
[0019]
Each of the patch antennas 13, 14, 15 and 16 has a maximum radiation pattern 33 on the antenna conductor 31 side as shown in FIG. 2A.
[0020]
Therefore, in the example of FIG. 1, the patch antennas 13 and 14 are antennas each having a radiation pattern that is maximum in the vertical direction above the ground, as shown in FIG. 5A. The two patch antennas 13 and 14 each have directivity in the same direction, and a space diversity effect is obtained.
[0021]
In the example of FIG. 1, the patch antennas 15 and 16 are antennas each having a radiation pattern that is maximum downward in the direction perpendicular to the ground, as shown in FIG. 5B. The two patch antennas 15 and 16 have directivity in the same direction, and a space diversity effect is obtained.
[0022]
As shown in FIG. 3, the reception outputs of the monopole antennas 11 and 12 and the patch antennas 13, 14, 15 and 16 are supplied to receivers 17, 18, 19, 20, 21 and 22, respectively, to obtain reception signals. The reception signals from the receivers 17, 18, 19, 20, 21 and 22 are supplied to the fixed contacts 23a, 23b, 23c, 23d, 23e and 23f of the changeover switch 23, respectively.
[0023]
Further, the reception levels of the receivers 17, 18, 19, 20, 21, and 22 are supplied to the reception level comparator 24, and the reception level comparator 24 determines that the reception level is the highest. Depending on the determination, the antenna contactor 25 controls the movable contact 23g of the change-over switch 23, and the movable contact 23g can be used as a fixed contact 23a, 23b, 23c, 23d, 23e or the like. A stable received signal having the highest reception level is obtained at the output terminal 26, and is used.
[0024]
In this example, as shown in FIGS. 1 and 3, radio waves from the communication partner are input to the antennas 11, 12, 13, 14, 15, and 16, and the receivers 17, 18, 19, Received at 20, 21, and 22 is a received signal. At this time, the electric field strength, that is, the reception level is compared by the reception level comparator 24, and it is determined that the reception level is the highest. In response to this determination, the antenna switch 25 performs the highest reception with the highest electric field strength. A reception signal received by an antenna having a high level is selected and supplied to an output terminal, which is used.
[0025]
In this case, in home communication in a general home, as shown in FIGS. 6A and 6B, communication between the same floor and upper and lower floors, that is, communication in a three-dimensional space, is expected. A plurality of antennas having a radiation pattern in consideration of communication, that is, monopole antennas 11 and 12 having a radiation pattern that is omnidirectional in the horizontal direction with respect to the ground, and a radiation pattern that is maximized in the upper direction perpendicular to the ground. Of the antenna having the largest reception level among the antennas having three different radiation patterns, the patch antennas 13 and 14 having the radiation pattern and the patch antennas 15 and 16 having the radiation pattern maximizing in the vertical direction below the ground. A received signal is selected, a directivity diversity effect is obtained, and good communication can be performed.
[0026]
In the above example, a pair of antennas having radiation patterns in the same direction, that is, the monopole antennas 11 and 12, the patch antennas 13 and 14, and the patch antennas 15 and 16 are provided, so that a spatial diversity effect can be obtained with each pair. it can.
[0027]
In the above example, the example in which the receivers 17, 18, 19, 20, 21, and 22 are provided for all the antennas 11, 12, 13, 14, 15, and 16, respectively. Of course, the received signal may be supplied to the receiver and the receiver may be shared.
[0028]
In the above example, two antennas having three different radiation patterns are provided. However, this may be one, or may be three or more.
[0029]
Further, the present invention is not limited to the above-described examples, and various other configurations can be adopted without departing from the gist of the present invention.
[0030]
【The invention's effect】
According to the present invention, since a plurality of antennas having a radiation pattern considering communication in a three-dimensional space are provided, and an optimum antenna is selected by judging the reception level, a directional diversity effect is obtained. For example, in a home, good communication can be realized in a three-dimensional space such as communication between upper and lower floors.
[Brief description of the drawings]
FIG. 1 is a configuration diagram showing an example of an embodiment of a diversity antenna system of the present invention.
FIG. 2 shows an example of a patch antenna, where A is a cross-sectional view and B is a perspective view.
FIG. 3 is a block diagram of the example of FIG.
FIG. 4 is a diagram for explaining the present invention.
FIG. 5 is a diagram for explaining the present invention.
FIG. 6 is a diagram for explaining the present invention.
FIG. 7 is a configuration diagram illustrating an example of a conventional diversity antenna system.
FIG. 8 is a block diagram of FIG.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 10 ... Mobile communication terminal 11, 12 ... Monopole antenna, 13, 14, 15, 16 ... Patch antenna, 17, 18, 19, 20, 21, 22 ... Receiver, 23 ... Changeover switch, 24... Reception level comparator, 25... Antenna switch, 26.

Claims (2)

地面に対して水平方向で無指向性となる放射パターンを有する第１のアンテナと、A first antenna having a radiation pattern that is omnidirectional in a horizontal direction with respect to the ground;
地面に対して垂直方向上方で最大となる放射パターンを有する第２のアンテナと、A second antenna having a radiation pattern maximizing vertically above the ground;
地面に対して垂直方向下方で最大となる放射パターンを有する第３のアンテナと、A third antenna having a radiation pattern that is maximized vertically below the ground;
前記第１、第２及び第３のアンテナの各々から得られる受信強度情報により最適なアンテナを選択する選択手段と、Selecting means for selecting an optimum antenna according to reception intensity information obtained from each of the first, second and third antennas;
を具備することを特徴とする移動通信端末。A mobile communication terminal comprising: 請求項１記載の移動通信端末において、The mobile communication terminal according to claim 1, wherein
前記第１、第２及び第３のアンテナの各々が複数設けられていることを特徴とする移動通信端末。A mobile communication terminal comprising a plurality of the first, second and third antennas.
JP19784699A 1999-07-12 1999-07-12 Mobile communication terminal Expired - Lifetime JP4240662B2 (en)

Priority Applications (4)

Application Number Priority Date Filing Date Title
JP19784699A JP4240662B2 (en) 1999-07-12 1999-07-12 Mobile communication terminal
TW089113430A TW474074B (en) 1999-07-12 2000-07-06 Diversity antenna system and mobile communication terminal
KR1020000039228A KR100761227B1 (en) 1999-07-12 2000-07-10 Diversity antenna system and mobile communication terminal
CNB001286099A CN1143453C (en) 1999-07-12 2000-07-12 Diversity aerial system and mobile communication terminal

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
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TW474074B (en) 2002-01-21
CN1143453C (en) 2004-03-24

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