Abstract: System for generating a pulsed signal of the ultra wideband type, comprising a device for direct digital frequency synthesis (DDS) comprising a phase accumulator (ACCP) able to deliver at a first frequency (Fclk) phases coded on i bits and spaced apart by a phase increment (?p) differing by a power of two and situated in the vicinity of 2i-1, processing means (MT) able to receive said phases and arranged so as to deliver an amplitude-modulated output signal (SG) whose envelope exhibits a succession of regions respectively delimited by zones of zero amplitude (ZA, ZB), each amplitude-modulated signal part situated in one of said regions forming a pulse of the ultra wideband type (IMP) whose central frequency is equal to said first frequency and whose width depends on the value of the phase increment, and control means (MC) able to regulate the operation of the digital synthesis device so as to selectively deliver one or more pulses of the ultra wideband type.

Abstract: The invention concerns a dual-polarisation antenna comprising: a microstrip substrate (1) covered, on a first face, with a metallisation (M) and, on a face opposite to the first face, with two microstrip lines; a dielectric resonator (2) having the form of a cylinder of revolution fixed to an etching (4) formed in the substrate, a first end of a first one of the two microstrip lines forming a first port of the antenna and a first end of the second microstrip line forming a second port of the antenna; and an electrically conductive linear element (3) placed in contact with the dielectric resonator and connected to a second end of the first line (L1), via a hole (5) formed in the substrate (1), a second end of the second line (L2) being substantially vertical to the etching.

Abstract: System for generating a pulsed signal of the ultra wideband type, comprising a device for direct digital frequency synthesis (DDS) comprising a phase accumulator (ACCP) able to deliver at a first frequency (Fclk) phases coded on i bits and spaced apart by a phase increment (?p) differing by a power of two and situated in the vicinity of 2i?1, processing means (MT) able to receive said phases and arranged so as to deliver an amplitude-modulated output signal (SG) whose envelope exhibits a succession of regions respectively delimited by zones of zero amplitude (ZA, ZB), each amplitude-modulated signal part situated in one of said regions forming a pulse of the ultra wideband type (IMP) whose central frequency is equal to said first frequency and whose width depends on the value of the phase increment, and control means (MC) able to regulate the operation of the digital synthesis device so as to selectively deliver one or more pulses of the ultra wideband type.