An Automatic Antenna Tuning System Using Only RF Signal Amplitudes

An Automatic Real Time Impedance Matching System for Use in an RF Electrostatics Accelerator Ion Source

Phase Only Synthesis of Antenna Patterns Using Iterative Restoration Methods

In this work, the method of iterative Fourier transform phase reconstruction, conventionally used in holography and optical image reconstruction, is applied to phase only synthesis of antenna patterns. The method is applied to two types of pattern synthesis problems: "main lobe beam shaping" and "side-lobe-level reduction". The proposed method is most useful in the efficient employment of attai...

Automatic Varactor Tuning of Interventional RF Receiver Coils

R. Venook, G. Gold, B. Hu, G. Scott Stanford University, Stanford, CA, United States, Palo Alto Medical Foundation, Palo Alto, CA, United States Synopsis: Small, flexible RF coils are well suited for interventional applications because of their locally-high SNR and deployability. These characteristics also make such coils easily detuned/mismatched, which can hamper imaging performance. This wor...

Implantable Biomedical Signal Monitoring Using RF Energy Harvesting & On-chip Antenna

This paper presents the design of an energy harvesting wireless and battery-less silicon-on-chip (SoC) device that can be implanted in the human body to monitor certain health conditions. The proposed architecture has been designed on TSMC 0.18μm CMOS ICs and is an integrated system with a rectenna (antenna and rectifier) and transmitting circuit, all on a single chip powered by an external tra...

Statistical Modeling of Feedback Data in an Automatic Tuning System

Achieving peak performance from library subroutines usually requires extensive, machine-dependent tuning by hand. Automatic tuning systems have been developed in response which typically operate, at compiletime, by (1) generating a large number of possible implementations of a subroutine, and (2) selecting a fast implementation by an exhaustive, empirical search. In this paper, we show how stat...