A transponder system comprising: a first antenna array and a second antenna array, each comprising a plurality of antenna elements (50,50') arranged in a predetermined geometry, the antenna elements of the first antenna array being respectively interconnected with corresponding antenna elements of the second antenna array by respective connection lines to form a plurality of receiving-transmitting pairs of antenna elements, at least one of said first and second antenna arrays (12,14) being rotatable with respect to the other about at least one predetermined rotation axis; an actuation module connected to said at least one rotatable antenna array (12,14) and configured to enable controllable rotation of said rotatable antenna array (12,14) about said at least one predetermined rotation axis; a control unit connected to said actuation module and configured for receiving data indicative of a desired angular shift between direction of propagation of the output signal wavefront with respect to direction of propagation of the collected signal waveform, and for operating said actuation module to vary a relative angle between said first and second antenna arrays (12,14) for providing said angular shift wherein said receiving-transmitting pairs being configured to receive an input electromagnetic signal by one antenna element, to route the signal via its corresponding connection line to the corresponding antenna elements of the receiving-transmitting pair, and transmit a corresponding output signal by its corresponding antenna element, thereby enabling collective collection of a signal waveform and transmission of a corresponding output signal waveform with selective variation of direction of propagation of the output signal waveform with respect to direction of propagation of the collected signal waveform. a first antenna array and a second antenna array, each comprising a plurality of antenna elements (50,50') arranged in a predetermined geometry, the antenna elements of the first antenna array being respectively interconnected with corresponding antenna elements of the second antenna array by respective connection lines to form a plurality of receiving-transmitting pairs of antenna elements, at least one of said first and second antenna arrays (12,14) being rotatable with respect to the other about at least one predetermined rotation axis; an actuation module connected to said at least one rotatable antenna array (12,14) and configured to enable controllable rotation of said rotatable antenna array (12,14) about said at least one predetermined rotation axis; a control unit connected to said actuation module and configured for receiving data indicative of a desired angular shift between direction of propagation of the output signal wavefront with respect to direction of propagation of the collected signal waveform, and for operating said actuation module to vary a relative angle between said first and second antenna arrays (12,14) for providing said angular shift wherein said receiving-transmitting pairs being configured to receive an input electromagnetic signal by one antenna element, to route the signal via its corresponding connection line to the corresponding antenna elements of the receiving-transmitting pair, and transmit a corresponding output signal by its corresponding antenna element, thereby enabling collective collection of a signal waveform and transmission of a corresponding output signal waveform with selective variation of direction of propagation of the output signal waveform with respect to direction of propagation of the collected signal waveform.