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Based on the differential equations for a single-circuit self-oscillating system subjected to its own delayed reflected radiation, expressions for analytical investigation of autodynes using phase-plane portraits and amplitudefrequency characteristics are obtained. Computation and graphical plotting of the latter characteristics are performed for the case of a moving reflecting target using different values of autodyne signal distortion. It is shown that an adequate description of the autodyne effect in microwave and millimeter-wave oscillators requires that a "phase" approach be used, which ensures a wide variation in the reflected radiation parameters, including those determining experimentally observed nonharmonic autodyne signals.

General equations are obtained for the autodyne response in the case of an arbitrary frequency modulation both over the active element bias circuit and voltage variation on the voltage-dependent capacitor (varicap). The results of investigation of an autodyne oscillator with linear frequency modulation following the antisymmetric and symmetric saw-tooth function are presented, with the oscillator being affected by its own reflected radiation. Special features of self-oscillations of such autodynes are considered, with the aim to improve their characteristics and extend the functional capabilities of short-range autodyne radars. The experimental results obtained for the TIGEL 08FM oscillator module manufactured using a hybrid-integral technology on the basis of a mm-range Gunn diode are reported.

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