Temperature compensation and low g-vibration sensitivity STW microwave source

Abstract

In many areas there is a high demand for high performance frequency sources such as high frequency stability, low g-vibration sensitivity in rigorous operating environment involving temperature, humidity and vibration. This paper reports a surface transverse wave (STW) microwave source with temperature compensation and very low g-vibration sensitivity. Its frequency deviation, which is compensated by an analog temperature compensation (ATC) technique with varactor diode and resistance thermistor network, is approximately 18 ppm over a wide temperature range (-40/spl deg/C/spl sim/+65/spl deg/C). Its operating frequency is 2 GHz. Its g-vibration sensitivity is less than 5/spl times/10/sup -10//g along three orthogonal directions. Its sinusoidal vibrating frequency from 80 Hz to 1500 Hz with 5 minutes at each vibrating frequency. The vibrating-induced FM sideband levels were measured directly using a spectrum analyzer.