MEMS-based adaptive impedance matching network

Ashok Srivastava

doi:10.1117/12.483569

22 July 2003 MEMS-based adaptive impedance matching network

Ashok Srivastava

Proceedings Volume 5055, Smart Structures and Materials 2003: Smart Electronics, MEMS, BioMEMS, and Nanotechnology; (2003) https://doi.org/10.1117/12.483569
Event: Smart Structures and Materials, 2003, San Diego, California, United States

Abstract

The architecture level design of an impedance matching network is presented for the global system for mobile communication radio frequency (GSM RF) power amplifier module used in a typical cellular handset. Designs for the low and high output impedance of the power amplifier and 50 Ω antenna impedance are considered. Impedance matching network design is presented for a typical low output impedance (Z = 2-j*0.4 Ω) of the power amplifier and 50 Ω antenna impedance and is made adaptive for high output impedance (Z = 7+j*2 Ω). It is shown that the network can be made adaptive to varying output requirements of the power amplifier by tuning the network capacitance toward the antenna end. The architecture level design of a 25 Ω antenna impedance is also presented and shown that that the impedance matching network can be made adaptive, which would require the use of MEMS switches. The adaptive impedance matching networks can be implemented in a passive integration technology with post-processing for MEMS components.

Citation Download Citation

Ashok Srivastava "MEMS-based adaptive impedance matching network", Proc. SPIE 5055, Smart Structures and Materials 2003: Smart Electronics, MEMS, BioMEMS, and Nanotechnology, (22 July 2003); https://doi.org/10.1117/12.483569

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KEYWORDS

Amplifiers

Antennas

Microelectromechanical systems

Network architectures

Capacitors

Global system for mobile communications

Capacitance

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