Abstract-A delay nonlinear differential equation is proposed to investigate the condition of the microwave chaotic behavior existing between the antenna and the front-end protection circuit of a receiver such as the radar front-end limiter circuit. This investigation concerns the case of intentional or unintentional signals applied to the antenna outside of its bandwidth.Bifurcation diagrams show that the chaotic behavior appears for antenna impedance up to 10 Ω and for amplitudes greater than 1.2 V. Electrical simulation results agree well with theoretical ones.
Abstract-Impact of electromagnetic interference on front-end receiver behaviour is theoretically and experimentally studied outside the bandwidth of the antennas. Microwave chaotic generation is observed. Under certain conditions, reflected waves combined to the non linearity of the front-end receiver leads to a chaotic signal generation between the antenna and the front-end receiver. Different antennas, such as patch, loop, monopole and horn, are tested. Theoretical and experimental results are presented for each antenna.
A 2.2 GHz 50 Ω microwave buffered Colpitts oscillator is designed and realized on microstrip hybrid technology. The buffer is optimized in order to match the microwave 50 Ω-12-GHz-oscilloscope without changing significantly the chaotic out-put characteristic. Experimental characterization gives a fundamental frequency of 2.2 GHz. Bifurcation diagrams show the effect of the critical microstrip line parameters on the chaotic oscillator behaviour.
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