IN164328B - - Google Patents
Info
- Publication number
- IN164328B IN164328B IN394/CAL/86A IN394CA1986A IN164328B IN 164328 B IN164328 B IN 164328B IN 394CA1986 A IN394CA1986 A IN 394CA1986A IN 164328 B IN164328 B IN 164328B
- Authority
- IN
- India
- Prior art keywords
- impedance
- vswr
- circle
- antenna
- inductive
- Prior art date
Links
Classifications
-
- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03H—IMPEDANCE NETWORKS, e.g. RESONANT CIRCUITS; RESONATORS
- H03H7/00—Multiple-port networks comprising only passive electrical elements as network components
- H03H7/38—Impedance-matching networks
- H03H7/40—Automatic matching of load impedance to source impedance
Landscapes
- Transmitters (AREA)
- Transceivers (AREA)
- Input Circuits Of Receivers And Coupling Of Receivers And Audio Equipment (AREA)
- Variable-Direction Aerials And Aerial Arrays (AREA)
Abstract
1. A method for automatically matching the unknown impedance of an antenna to the known nominal impedance of a transmitter using a matching network having variable impedance and which is connected on the input side via a measuring head to the transmitter output and on the output side to the antenna, which network also has at least one input-side capacitive shunt arm with a variable capacitance, consisting for example of a plurality of capacitor elements which can be switched in parallel to one another and has an inductive series arm with a variable inductance consisting, for example, of a plurality of coil elements which can be switched in series to one another, which network in addition for setting its variable impedance by changing the capacitance of the capacitive shunt arm and/or the inductance in the inductive series arm cooperates with a micro-processor which controls, in dependence on the information transferred to it on the input side by the measuring head, in particular relating to the voltage standing wave ratio (VSWR) and the phase relation, the impedance setting of the matching network in the desired direction, characterized in that, to perform a standard tuning process (STA), the transformed antenna impedance presented to the transmitter output via the matching network (AN) assumes an inductive value in a first step by changing the inductance in the inductive series arm and, relative to the Smith diagram, reaches the "G= 1" circle, in that, in a second step, by changing the capacitance in the capacitive shunt arm the transformed antenna impedance is moved along the "G= 1" circle (G= 1) until the measuring head (MK) indicates the transition from the inductive zone to the capacitive zone and thus the tuning process is concluded in that, however, if the transformed antenna impedance indicates an excessively high voltage standing wave ratio, approximately VSWR > 3 when the "G= 1" circle is reached, an intermediate step is performed in the course of the second step when a predetermined voltage standing wave ratio, approximately VSWR= 3, is reached, in which second step the transformed impedance of the antenna is corrected, by further changing the inductance in the inductive series arm, in the direction of its displacement to the "G = 1" circle and in that for the completion of these process steps, the measuring head is designed in terms of circuitry to issue control information to the micro-processor (MP) in such a way that these items of control information have, in addition to information relating to the transmitting level (P), Phase (Ph) and voltage threshold ratios (VSWR) < 1,5 ; VSWR > 3), also a criterion for the "G = 1" circle (G = 1).
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE3523823 | 1985-07-03 |
Publications (1)
Publication Number | Publication Date |
---|---|
IN164328B true IN164328B (en) | 1989-02-18 |
Family
ID=6274871
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
IN394/CAL/86A IN164328B (en) | 1985-07-03 | 1986-05-27 |
Country Status (6)
Country | Link |
---|---|
EP (1) | EP0208984B1 (en) |
AT (1) | ATE53151T1 (en) |
DE (1) | DE3671586D1 (en) |
IN (1) | IN164328B (en) |
NO (1) | NO170377C (en) |
ZA (1) | ZA864917B (en) |
Families Citing this family (9)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP2794987B2 (en) * | 1991-05-31 | 1998-09-10 | 日本電気株式会社 | Portable wireless devices |
FI94807C (en) * | 1992-12-30 | 1995-10-25 | Nokia Telecommunications Oy | Method and apparatus for tuning / adjusting a combiner filter |
DE19644339C1 (en) * | 1996-10-25 | 1998-06-10 | Bosch Gmbh Robert | Device for transforming an antenna impedance |
KR19980077560A (en) * | 1997-04-21 | 1998-11-16 | 장응순 | High impedance high frequency antenna |
KR100285950B1 (en) * | 1997-12-26 | 2001-04-16 | 윤종용 | Method for emboding antenna circuit of mobile phone for reducing an influence of human body |
CN102439820B (en) * | 2010-05-03 | 2016-08-03 | 松下知识产权经营株式会社 | TRT, electricity generation system and Contactless power transmission device |
KR101176286B1 (en) * | 2010-08-02 | 2012-08-22 | 엘지이노텍 주식회사 | Apparatus and method for matching impedance using Standing Wave Ratio information |
US9325355B2 (en) | 2013-02-14 | 2016-04-26 | Blackberry Limited | Methods and apparatus for performing impedance matching |
US9729190B2 (en) * | 2014-01-17 | 2017-08-08 | Qualcomm Incorporated | Switchable antenna array |
Family Cites Families (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3778731A (en) * | 1972-06-05 | 1973-12-11 | Cincinnati Electronics Corp | Tuning method for t-network couplers |
FR2205252A5 (en) * | 1972-10-31 | 1974-05-24 | Trt Telecom Radio Electr | |
GB1524965A (en) * | 1974-10-15 | 1978-09-13 | Cincinnati Electronics Corp | Technique for automatic matching of high q-loads |
US4201960A (en) * | 1978-05-24 | 1980-05-06 | Motorola, Inc. | Method for automatically matching a radio frequency transmitter to an antenna |
-
1986
- 1986-05-27 IN IN394/CAL/86A patent/IN164328B/en unknown
- 1986-07-01 AT AT86108935T patent/ATE53151T1/en not_active IP Right Cessation
- 1986-07-01 DE DE8686108935T patent/DE3671586D1/en not_active Expired - Fee Related
- 1986-07-01 EP EP86108935A patent/EP0208984B1/en not_active Expired - Lifetime
- 1986-07-02 ZA ZA864917A patent/ZA864917B/en unknown
- 1986-07-02 NO NO862671A patent/NO170377C/en unknown
Also Published As
Publication number | Publication date |
---|---|
EP0208984B1 (en) | 1990-05-23 |
ZA864917B (en) | 1987-02-25 |
EP0208984A1 (en) | 1987-01-21 |
NO170377B (en) | 1992-06-29 |
NO862671L (en) | 1987-01-05 |
NO862671D0 (en) | 1986-07-02 |
DE3671586D1 (en) | 1990-06-28 |
ATE53151T1 (en) | 1990-06-15 |
NO170377C (en) | 1992-10-07 |
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