Impedance Network for an Automatic Impedance Matching System

This work presents a RF tunable impedance matching network. It uses a quarter-wavelength (lambda /4) transmission line loaded by a combination of switches, capacitors and inductors. With MEMS-based switches and inductors, the simulation results show that this circuit is capable of correction load reflection coefficients of up 0.5 to better than 0.3 with insertion loss between 0.74-2.11 dB at 2 GHz.

[1]  Gabriel M. Rebeiz,et al.  RF MEMS switches and switch circuits , 2001 .

[2]  S. Eshelman,et al.  Micromachined low-loss microwave switches , 1999 .

[3]  J. Toftgard,et al.  Effects on Portable Antennas by the Presence of a Person , 1993 .

[4]  B. Huyart,et al.  MMIC impedance matching system , 2000 .

[5]  Yichuang Sun,et al.  Evolutionary tuning method for automatic impedance matching in communication systems , 1998, 1998 IEEE International Conference on Electronics, Circuits and Systems. Surfing the Waves of Science and Technology (Cat. No.98EX196).

[6]  Antonino Scuderi,et al.  A VSWR-protected silicon bipolar RF power amplifier with soft-slope power control , 2005, IEEE Journal of Solid-State Circuits.

[7]  P. Garcia,et al.  An RF electronically controlled impedance tuning network design and its application to an antenna input impedance automatic matching system , 2004, IEEE Transactions on Microwave Theory and Techniques.

[8]  Hikaru Ikeda,et al.  Analysis of phase characteristics of a GaAs FET power amplifier for digital cellular portable telephones , 1994 .

[9]  Mark G. Allen,et al.  Packaging-compatible high Q microinductors and microfilters for wireless applications , 1999, ECTC 1999.

[10]  Elliott R. Brown,et al.  RF-MEMS switches for reconfigurable integrated circuits , 1998 .

[11]  R. Hattori,et al.  A 3.2-V operation single-chip dual-band AlGaAs/GaAs HBT MMIC power amplifier with active feedback circuit technique , 2000, IEEE Journal of Solid-State Circuits.

[12]  R A Sadeghzadeh,et al.  Effect of User Head on Mobile Telephone Handset Antenna Impedance and Head Internal Fields Distribution , 1994, 1994 24th European Microwave Conference.