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, re∞ected 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. Difierent antennas, such as patch, loop, monopole and horn, are tested. Theoretical and experimental results are presented for each antenna. When an intentional or an unintentional electromagnetic interference is applied outside of the bandwidth of an antenna, re∞ection waves are generated between the antenna radiation impedance which is in the case of a few ohms and the nonlinear impedance of the front-end circuit of the receiver which is interconnected to the antenna via a transmission line. Under certain conditions, the efiects of the re∞ected waves due to antenna mismatch combined to those of the nonlinear impedance of the front-end circuits lead to chaos generation. This can have an impact on the electrical behaviour of the receiver particularly for high speed receiver systems and short electromagnetic interference wave lengths. The chaotic behaviour has already been observed in a microwave limiter circuit (1), in 'R-L-diode' circuits (2{7) and also in VHF microstrip oscillator (8). The doubling period has been observed
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