Adaptive Impedance-Matching Techniques for Controlling L Networks
The link quality of mobile phones suffers from antenna mismatch due to fluctuating body effects. Techniques for adaptive control of impedance-matching L networks are presented, which provide automatic compensation of antenna mismatch. To secure reliable convergence, a cascade of two control loops is...
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| Veröffentlicht in: | IEEE transactions on circuits and systems. I, Regular papers Regular papers, 2010-02, Vol.57 (2), p.495-505 |
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| container_title | IEEE transactions on circuits and systems. I, Regular papers |
| container_volume | 57 |
| creator | van Bezooijen, A. de Jongh, M.A. van Straten, F. Mahmoudi, R. van Roermund, A. |
| description | The link quality of mobile phones suffers from antenna mismatch due to fluctuating body effects. Techniques for adaptive control of impedance-matching L networks are presented, which provide automatic compensation of antenna mismatch. To secure reliable convergence, a cascade of two control loops is proposed for independent control of the real and imaginary parts of impedance. A secondary feedback path is used to enforce operation into a stable region when needed. These techniques exploit the basic properties of tunable series and parallel LC networks. A generic quadrature detector that offers a power-independent orthogonal reading of the complex impedance value is presented, which is used for direct control of variable capacitors. This approach renders calibration and elaborate software computation superfluous and allows for autonomous operation of adaptive antenna-matching modules. |
| doi_str_mv | 10.1109/TCSI.2009.2023764 |
| format | Article |
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Techniques for adaptive control of impedance-matching L networks are presented, which provide automatic compensation of antenna mismatch. To secure reliable convergence, a cascade of two control loops is proposed for independent control of the real and imaginary parts of impedance. A secondary feedback path is used to enforce operation into a stable region when needed. These techniques exploit the basic properties of tunable series and parallel LC networks. A generic quadrature detector that offers a power-independent orthogonal reading of the complex impedance value is presented, which is used for direct control of variable capacitors. 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(IEEE) Feb 2010</rights><lds50>peer_reviewed</lds50><woscitedreferencessubscribed>false</woscitedreferencessubscribed><citedby>FETCH-LOGICAL-c356t-ffca2a0ff454d92ef3f3cd644fdba7f0e35217b304c4520df0ef2565b798708a3</citedby><cites>FETCH-LOGICAL-c356t-ffca2a0ff454d92ef3f3cd644fdba7f0e35217b304c4520df0ef2565b798708a3</cites></display><links><openurl>$$Topenurl_article</openurl><openurlfulltext>$$Topenurlfull_article</openurlfulltext><thumbnail>$$Tsyndetics_thumb_exl</thumbnail><linktohtml>$$Uhttps://ieeexplore.ieee.org/document/5061524$$EHTML$$P50$$Gieee$$H</linktohtml><link.rule.ids>314,780,784,796,27924,27925,54758</link.rule.ids><linktorsrc>$$Uhttps://ieeexplore.ieee.org/document/5061524$$EView_record_in_IEEE$$FView_record_in_$$GIEEE</linktorsrc></links><search><creatorcontrib>van Bezooijen, A.</creatorcontrib><creatorcontrib>de Jongh, M.A.</creatorcontrib><creatorcontrib>van Straten, F.</creatorcontrib><creatorcontrib>Mahmoudi, R.</creatorcontrib><creatorcontrib>van Roermund, A.</creatorcontrib><title>Adaptive Impedance-Matching Techniques for Controlling L Networks</title><title>IEEE transactions on circuits and systems. I, Regular papers</title><addtitle>TCSI</addtitle><description>The link quality of mobile phones suffers from antenna mismatch due to fluctuating body effects. Techniques for adaptive control of impedance-matching L networks are presented, which provide automatic compensation of antenna mismatch. To secure reliable convergence, a cascade of two control loops is proposed for independent control of the real and imaginary parts of impedance. A secondary feedback path is used to enforce operation into a stable region when needed. These techniques exploit the basic properties of tunable series and parallel LC networks. A generic quadrature detector that offers a power-independent orthogonal reading of the complex impedance value is presented, which is used for direct control of variable capacitors. This approach renders calibration and elaborate software computation superfluous and allows for autonomous operation of adaptive antenna-matching modules.</description><subject>Adaptive arrays</subject><subject>Adaptive control</subject><subject>Adaptive filters</subject><subject>Antennas</subject><subject>Automatic control</subject><subject>Convergence</subject><subject>Detectors</subject><subject>Feedback</subject><subject>Impedance</subject><subject>impedance matching</subject><subject>Mobile antennas</subject><subject>Mobile handsets</subject><subject>power amplifiers</subject><subject>Programmable control</subject><subject>switched-capacitor filters</subject><issn>1549-8328</issn><issn>1558-0806</issn><fulltext>true</fulltext><rsrctype>article</rsrctype><creationdate>2010</creationdate><recordtype>article</recordtype><sourceid>RIE</sourceid><recordid>eNqFkE1PwzAMhiMEEjD4AYhLxYVTh_PdHKeKj0kDDoxzlKUJ6-iakXQg_j2tNnHgwsW27Oe17BehCwxjjEHdzMuX6ZgAqD4QKgU7QCeY8yKHAsThUDOVF5QUx-g0pRUAUUDxCZpMKrPp6k-XTdcbV5nWuvzRdHZZt2_Z3NllW39sXcp8iFkZ2i6GphlGs-zJdV8hvqczdORNk9z5Po_Q693tvHzIZ8_303Iyyy3losu9t4YY8J5xViniPPXUVoIxXy2M9OAoJ1guKDDLOIGq73jCBV9IVUgoDB2h693eTQzDSZ1e18m6pjGtC9ukC8mBAgj5LykZFaLHaU9e_SFXYRvb_g1dcEmxUgr3EN5BNoaUovN6E-u1id8agx7M14P5ejBf783vNZc7Te2c--U5CMwJoz9u239X</recordid><startdate>20100201</startdate><enddate>20100201</enddate><creator>van Bezooijen, A.</creator><creator>de Jongh, M.A.</creator><creator>van Straten, F.</creator><creator>Mahmoudi, R.</creator><creator>van Roermund, A.</creator><general>IEEE</general><general>The Institute of Electrical and Electronics Engineers, Inc. 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I, Regular papers</jtitle></facets><delivery><delcategory>Remote Search Resource</delcategory><fulltext>fulltext_linktorsrc</fulltext></delivery><addata><au>van Bezooijen, A.</au><au>de Jongh, M.A.</au><au>van Straten, F.</au><au>Mahmoudi, R.</au><au>van Roermund, A.</au><format>journal</format><genre>article</genre><ristype>JOUR</ristype><atitle>Adaptive Impedance-Matching Techniques for Controlling L Networks</atitle><jtitle>IEEE transactions on circuits and systems. I, Regular papers</jtitle><stitle>TCSI</stitle><date>2010-02-01</date><risdate>2010</risdate><volume>57</volume><issue>2</issue><spage>495</spage><epage>505</epage><pages>495-505</pages><issn>1549-8328</issn><eissn>1558-0806</eissn><coden>ITCSCH</coden><abstract>The link quality of mobile phones suffers from antenna mismatch due to fluctuating body effects. Techniques for adaptive control of impedance-matching L networks are presented, which provide automatic compensation of antenna mismatch. To secure reliable convergence, a cascade of two control loops is proposed for independent control of the real and imaginary parts of impedance. A secondary feedback path is used to enforce operation into a stable region when needed. These techniques exploit the basic properties of tunable series and parallel LC networks. A generic quadrature detector that offers a power-independent orthogonal reading of the complex impedance value is presented, which is used for direct control of variable capacitors. This approach renders calibration and elaborate software computation superfluous and allows for autonomous operation of adaptive antenna-matching modules.</abstract><cop>New York</cop><pub>IEEE</pub><doi>10.1109/TCSI.2009.2023764</doi><tpages>11</tpages></addata></record> |
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| subjects | Adaptive arrays Adaptive control Adaptive filters Antennas Automatic control Convergence Detectors Feedback Impedance impedance matching Mobile antennas Mobile handsets power amplifiers Programmable control switched-capacitor filters |
| title | Adaptive Impedance-Matching Techniques for Controlling L Networks |
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