BST Capacitor Based Tunable Matching Network for SAW Sensors

Abstract

Surface acoustic wave (SAW) sensors are becoming extremely important in environmental health monitoring by wireless technologies. SAW devices need impedance matching networks at the input and output for efficient power transfer. In this paper, we are presenting the results of tunable matching networks for SAW devices with BST capacitors. We used simple L-matching network implemented with chip inductors and tunable BST capacitors. The characteristics of tunable matching network interfaced to SAW device is simulated using Agilent's ADS simulation tool. The return loss from the SAW devices can be increased and tuned significantly by applying a tuning voltage to the BST capacitors. The SAW device which has been studied is SAW filter.

Keywords:

• BST
• capacitors
• SAW sensors
• SAW devices
• surface acoustic wave

Acknowledgment

Mr. Alzahrani is appreciative to University of Tabuk for graduate scholarship.