Abstract

In this paper, we have designed a signal tracking microwave notch filter at X-band (8 GHz-12.4 GHz) which is tunable. The experimental notch frequency is 9.42 GHz and a 3-dB bandwidth of this filter is 105 MHz. The theoretical response agrees well with the experimental response of this notch filter. The frequency can be tuned by tuning the Gunn oscillators. The Gunn oscillators being injection –locked to the input signal make the notch filter tracking in character.

Highlights

  • Microwave notch filters [1,2,3,4,5,6,7,8,9,10,11,12,13,14,15,16,17,18,19] are essential components of a microwave communication system

  • Optical realizations of tunable microwave notch filter have reported in literature [12,13,14,15]

  • We report the electronic design of a microwave notch filter which is tunable, active and signal tracking in character simultaneously

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Summary

INTRODUCTION

Microwave notch filters [1,2,3,4,5,6,7,8,9,10,11,12,13,14,15,16,17,18,19] are essential components of a microwave communication system It finds application in satellite communication in order to eliminate interference which can produce jamming in a microwave receiver. It finds application in microwave distortion analyzer where the notch filter suppresses the fundamental component. The authors have designed a microwave active notch filter in which the injection signals to two Gunn oscillators are not in phase but they differ in phase which is signal frequency dependent. The experimental frequency response of the present notch filter is seen to fit with the theoretical response much better than that reported in [11]

SYSTEM DESCRIPTION
ANALYSIS
CONCLUSION

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