JPS61135235A - Antenna system - Google Patents
Antenna systemInfo
- Publication number
- JPS61135235A JPS61135235A JP25698384A JP25698384A JPS61135235A JP S61135235 A JPS61135235 A JP S61135235A JP 25698384 A JP25698384 A JP 25698384A JP 25698384 A JP25698384 A JP 25698384A JP S61135235 A JPS61135235 A JP S61135235A
- Authority
- JP
- Japan
- Prior art keywords
- receiver
- antenna
- input level
- impedance matching
- matching circuit
- 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
Links
Classifications
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B1/00—Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised by the medium used for transmission
- H04B1/06—Receivers
- H04B1/16—Circuits
- H04B1/18—Input circuits, e.g. for coupling to an antenna or a transmission line
Landscapes
- Engineering & Computer Science (AREA)
- Computer Networks & Wireless Communication (AREA)
- Signal Processing (AREA)
- Input Circuits Of Receivers And Coupling Of Receivers And Audio Equipment (AREA)
Abstract
Description
【発明の詳細な説明】
〔産業上の利用分野〕
本発明は移動無線用受信機、例えばＶＩＰ帯以上の周波
数で使用する・携帯用受信機のアンテナシステムの改良
に関するものである。DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to an improvement in the antenna system of a mobile radio receiver, for example, a portable receiver used at frequencies above the VIP band.
近年、ＶＨＦ−１１ＨＦ帯の携帯用受信機が広く使用さ
れているが、この受信機に使用されるアンテナシステム
は近傍にある人体や外部の物体の影響を受けてアンテナ
インピーダンスが大幅に変化する為、受信機との整合が
崩れて受信レヘルが大幅に低下して通話が不能になる事
がある。In recent years, portable receivers in the VHF-11HF band have been widely used, but the antenna system used in these receivers is affected by the influence of nearby human bodies and external objects, which causes the antenna impedance to change significantly. , the matching with the receiver may be disrupted and the reception level may drop significantly, making it impossible to make calls.
そこで、この様な事態が発生する可能性の少ないアンテ
ナシステムが要望されている。Therefore, there is a need for an antenna system that is less likely to cause such a situation.
一般に、携帯用受信機のアンテナとして％波長のスリー
ブアンテナ、Ａ波長のホイップアンテナ又はループアン
テナ等が用いられているが、これらのアンテナのアンテ
ナインピーダンスは近傍にある人体や物体の影響を受け
て大幅に変化する。In general, % wavelength sleeve antennas, A wavelength whip antennas, or loop antennas are used as antennas for portable receivers, but the antenna impedance of these antennas is significantly affected by nearby human bodies and objects. Changes to
この為、受信機とアンテナとの間に挿入されインピーダ
ンス整合回路は、アンテナインピーダンスと受信機入力
インピーダンスとの整合を取る事が不可能となり、受信
入力レベルが大幅に低下する。For this reason, an impedance matching circuit inserted between the receiver and the antenna is unable to match the antenna impedance and the receiver input impedance, resulting in a significant drop in the reception input level.
上記で説明した様に、アンテナの近傍にある人体等の影
響によって生じたアンテナインピーダンスの大幅な変化
により、アンテナと受信機との間で大きなインピーダン
ス不整合が生じ、受信レヘルが大幅に低下するので相手
局との通話が不可能になる事があると云う問題点があっ
た。As explained above, a large change in antenna impedance caused by the influence of a human body, etc. near the antenna causes a large impedance mismatch between the antenna and the receiver, which significantly reduces the reception level. There was a problem in that it was sometimes impossible to talk to the other station.
上記の問題点は、受信機への入力レベルが最大になる様
にインピーダンス整合回路に挿入した可変リアクタンス
素子のリアクタンス値を制御する本発明のアンテナシス
テムにより解決される。The above problems are solved by the antenna system of the present invention, which controls the reactance value of the variable reactance element inserted in the impedance matching circuit so that the input level to the receiver is maximized.
本発明は人体等がアンテナの近傍に来る事によって生ず
るアンテナインピーダンスの変化を、自動的に吸収する
インピーダンス整合回路を設けて、受信人力レベルの低
下を防止する様にした。The present invention provides an impedance matching circuit that automatically absorbs changes in antenna impedance caused by a human body coming close to the antenna, thereby preventing a decrease in the reception power level.
即ち、従来のインピーダンス整合回路はアンテナインピ
ーダンスの変化に対応してアンテナと受信機との間の整
合を取り直す事が困難な為、このアンテナインピーダン
スの変化を吸収する事は出来なかった。That is, conventional impedance matching circuits cannot absorb changes in antenna impedance because it is difficult to re-match between the antenna and the receiver in response to changes in antenna impedance.
しかし、本発明のインピーダンス整合回路は可変リアク
タンス素子を挿入して受信レベルが最大になる様に、こ
の可変リアクタンス素子のりアクタンス値を制御する様
にした。However, in the impedance matching circuit of the present invention, a variable reactance element is inserted and the actance value of the variable reactance element is controlled so that the reception level is maximized.
そこで、アンテナと受信機との間のインピーダンスの不
整合によるレベルの低下を最小にする事ができるので、
通話不能は殆どなくなる。Therefore, it is possible to minimize the drop in level due to impedance mismatch between the antenna and receiver.
Unable to make calls will almost disappear.
以下図示実施例により、本発明の要旨を具体的に説明す
る。尚、全図を通じて同一符号は同一対象物を示す。The gist of the present invention will be specifically explained below with reference to illustrated examples. Note that the same reference numerals indicate the same objects throughout the figures.
第１図は本発明の１実施例のブロック図、第２図はシス
テム動作フロー図を示す。FIG. 1 shows a block diagram of one embodiment of the present invention, and FIG. 2 shows a system operation flow diagram.
第１図において、受信波はアンテナ１．可変リアクタン
ス素子（例えば可変容量ダイオード）を含む例えばπ型
のインピーダンス整合回路２を介して受信機３に加えら
れる。In FIG. 1, received waves are received from antenna 1. The signal is applied to the receiver 3 via, for example, a π-type impedance matching circuit 2 that includes a variable reactance element (for example, a variable capacitance diode).
この受信波は受信機３で周波数変換、増幅等の処理を受
けるが、受信機入力レベルに対応する信号〔例えば受信
機内のＡＧＣ付き中間周波増幅器（図示せず）のＡＧＣ
＠圧を対数増幅器（図示せず）を通して線形化した信号
〕が端子Ｒ３Ｓｉより取出されアナログ／ディジタル変
換回路４でディジタル化され、論理回路５に加えられる
。This received wave is subjected to processing such as frequency conversion and amplification in the receiver 3, but a signal corresponding to the receiver input level [for example, AGC of an intermediate frequency amplifier with AGC (not shown) in the receiver
A signal obtained by linearizing the @ pressure through a logarithmic amplifier (not shown) is taken out from the terminal R3Si, digitized by the analog/digital conversion circuit 4, and applied to the logic circuit 5.
論理回路５では第２図に示したシステム動作フローによ
り、先ずインピーダンス整合回路２の中の可変容量ダイ
牙−ド２−１の印加電圧を下記の手順で決定する。、
■ 可変容量ダイオード２−１ 、２−２に初期電圧Ｖ
ｏｌ、 Ｖｏ２を印加し、端子Ｒ５Ｓ ｉのレベルを測
定する。The logic circuit 5 first determines the voltage applied to the variable capacitance diode 2-1 in the impedance matching circuit 2 according to the system operation flow shown in FIG. 2 in the following procedure. , ■ Initial voltage V on variable capacitance diodes 2-1 and 2-2
ol and Vo2 are applied, and the level of terminal R5S i is measured.
■ Ｖｏｌ の電圧のみΔＶｏ１ だけ増加して端子Ｒ
５Ｓ ｉのレベルを測定し、前の値と比較する。この時
、・増加していれば、これを繰返す。■ Vol voltage only increases by ΔVo1 and terminal R
Measure the level of 5S i and compare with the previous value. At this time, if it is increasing, repeat this.
・前の値より下がれば、ΔＶｏｌの極性を反転してＶｏ
に印加して繰返す。・If it falls below the previous value, reverse the polarity of ΔVol and set Vo
Apply and repeat.
・極大なら、Ｖｏｌを固定する。・If it is maximum, fix the Vol.
これで、可変容量ダイオード２−１のバイアス電圧は最
適に設定されたので、次に可変容量ダイオード２−２の
最適バイアス電圧を同じ様な手順で決定する。Now that the bias voltage of the variable capacitance diode 2-1 has been optimally set, next, the optimal bias voltage of the variable capacitance diode 2-2 is determined using the same procedure.
尚、可変リアクタンス素子として可変容量ダイオードを
使用した場合、スミスチャート上で９０％以上の領域を
電子的にカバーする事が可能である。Note that when a variable capacitance diode is used as the variable reactance element, it is possible to electronically cover more than 90% of the area on the Smith chart.
又、論理回路５よりのディジタル出力を可変容量ダイオ
ードのバイアス電圧に変換する為、ディジタル／アナロ
グ変換回路６及び７を使用している。Furthermore, digital/analog conversion circuits 6 and 7 are used to convert the digital output from the logic circuit 5 into a bias voltage for the variable capacitance diode.
第３図は本発明の別の１実施例のブロック図を示す。FIG. 3 shows a block diagram of another embodiment of the invention.
図に示す様に端子Ｒ５ＳｉよりのＡＧＣ電圧はディジタ
ル信号に変換しないで直流増幅器８で増幅し、端子Ｒ５
Ｓｉよりのレベルが最大になる様に可変容量ダイオード
２−１のバイアス電圧を制御する。As shown in the figure, the AGC voltage from the terminal R5Si is amplified by the DC amplifier 8 without being converted into a digital signal, and the AGC voltage from the terminal R5Si is amplified by the DC amplifier 8.
The bias voltage of the variable capacitance diode 2-1 is controlled so that the level from Si is maximized.
この場合、コンデンサ２−３に直列に可変容量ダイオー
ドを接続して、直流増幅器８の出力電圧で２つの可変容
量ダイオードのバイアス電圧を制御する事もできる。In this case, it is also possible to connect a variable capacitance diode in series with the capacitor 2-3 and control the bias voltage of the two variable capacitance diodes using the output voltage of the DC amplifier 8.
以上詳細に説明した様に、携帯用受信機のアンテナが人
体等の近傍に設置されても、受信機入力インピーダンス
との整合がほぼ取れる様になっているので、受信入力レ
ベルの低下は最小に押えられ、通話不能は殆ど無くなる
と云う効果が得られる。As explained in detail above, even if the antenna of a portable receiver is installed near the human body, it can almost match the input impedance of the receiver, so the drop in the received input level is minimized. This has the effect of almost eliminating the possibility of being blocked and unable to make a call.
第１図は本発明のブロック図、 第２図は本発明の動作フロー、 第３図は本発明の別のブロック図を示す。 図において、 ■はアンテナ、 ２はインピーダンス整合回路、 ３は受信機、 ４はアナログ／ディジタル変換回路、 ５は論理回路を示す。 草ｌ因 草 ３ ＠ FIG. 1 is a block diagram of the present invention, Figure 2 shows the operation flow of the present invention. FIG. 3 shows another block diagram of the invention. In the figure, ■ is antenna, 2 is an impedance matching circuit, 3 is the receiver, 4 is an analog/digital conversion circuit; 5 indicates a logic circuit. grass cause Grass 3 @
Claims (1)
整合を取るインピーダンス整合回路及び該受信機を含む
受信システムにおいて、該受信機への入力レベルが最大
となる様に該インピーダンス整合回路に挿入した可変リ
アクタンス素子のリアクタンス値を制御する様にした事
を特徴とするアンテナシステム。In a receiving system including an antenna, an impedance matching circuit for impedance matching between the antenna and the receiver, and the receiver, a variable reactance is inserted into the impedance matching circuit so that the input level to the receiver is maximized. An antenna system characterized by controlling the reactance value of an element.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP25698384A JPS61135235A (en) | 1984-12-05 | 1984-12-05 | Antenna system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP25698384A JPS61135235A (en) | 1984-12-05 | 1984-12-05 | Antenna system |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPS61135235A true JPS61135235A (en) | 1986-06-23 |
Family
ID=17300091
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP25698384A Pending JPS61135235A (en) | 1984-12-05 | 1984-12-05 | Antenna system |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS61135235A (en) |
Cited By (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS63156128U (en) * | 1987-03-31 | 1988-10-13 | ||
| EP0372430A2 (en) * | 1988-12-05 | 1990-06-13 | Seiko Corporation | Automatic antenna tuning |
| EP0469001A1 (en) * | 1989-03-28 | 1992-02-05 | Telefind Corporation | Paging receiver with continuously tunable antenna and rf amplifier |
| EP0633667A1 (en) * | 1993-07-06 | 1995-01-11 | Advanced Micro Devices, Inc. | Analogue-to-digital converters |
| US6219532B1 (en) | 1997-10-28 | 2001-04-17 | Nec Corporation | Movable radio terminal device capable of precisely matching impedances |
| GB2366081A (en) * | 2000-08-09 | 2002-02-27 | Motorola Israel Ltd | Radiation-efficient portable radio antenna which adapts to conditions |
| KR20020096008A (en) * | 2001-06-19 | 2002-12-28 | 엘지전자 주식회사 | Antena matching network |
| US8000379B2 (en) | 2005-07-01 | 2011-08-16 | Panasonic Corporation | Radio communication apparatus |
| EP2557688A1 (en) * | 2011-08-11 | 2013-02-13 | Nxp B.V. | A controller for a radio circuit |
| US11950885B2 (en) | 2018-08-23 | 2024-04-09 | Mitsubishi Electric Corporation | Biosensor device |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5533214A (en) * | 1978-08-31 | 1980-03-08 | Oki Electric Ind Co Ltd | Information processing system |
-
1984
- 1984-12-05 JP JP25698384A patent/JPS61135235A/en active Pending
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5533214A (en) * | 1978-08-31 | 1980-03-08 | Oki Electric Ind Co Ltd | Information processing system |
Cited By (13)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS63156128U (en) * | 1987-03-31 | 1988-10-13 | ||
| EP0372430A2 (en) * | 1988-12-05 | 1990-06-13 | Seiko Corporation | Automatic antenna tuning |
| EP0469001A1 (en) * | 1989-03-28 | 1992-02-05 | Telefind Corporation | Paging receiver with continuously tunable antenna and rf amplifier |
| EP0469001A4 (en) * | 1989-03-28 | 1992-12-02 | Telefind Corporation | Paging receiver with continuously tunable antenna and rf amplifier |
| EP0633667A1 (en) * | 1993-07-06 | 1995-01-11 | Advanced Micro Devices, Inc. | Analogue-to-digital converters |
| US5515050A (en) * | 1993-07-06 | 1996-05-07 | Advanced Micro Devices, Inc. | Apparatus and method for asynchronous successive approximation |
| US6219532B1 (en) | 1997-10-28 | 2001-04-17 | Nec Corporation | Movable radio terminal device capable of precisely matching impedances |
| AU745065B2 (en) * | 1997-10-28 | 2002-03-07 | Nec Corporation | Movable radio terminal device capable of precisely matching impedances |
| GB2366081A (en) * | 2000-08-09 | 2002-02-27 | Motorola Israel Ltd | Radiation-efficient portable radio antenna which adapts to conditions |
| KR20020096008A (en) * | 2001-06-19 | 2002-12-28 | 엘지전자 주식회사 | Antena matching network |
| US8000379B2 (en) | 2005-07-01 | 2011-08-16 | Panasonic Corporation | Radio communication apparatus |
| EP2557688A1 (en) * | 2011-08-11 | 2013-02-13 | Nxp B.V. | A controller for a radio circuit |
| US11950885B2 (en) | 2018-08-23 | 2024-04-09 | Mitsubishi Electric Corporation | Biosensor device |
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