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The Ultra Wide Band (UWB) communicating systems draw a tremendous attention in the last few years because of many potential advantages the UWB technology can bring to the wireless industry. It can solve the RF spectrum availability problem, improve the security, can provide less expensive, less power consuming equipment for a variety of wireless applications. We study a communication device, in which the Chaotic (Rossler) Oscillator (CO) combined with a linear Voltage Controlled Oscillator (VCO) is used to generate the UWB carrier signal with Chaotic Frequency Modulation (CFM). The information signal can be transmitted via the Frequency Modulation (FM) in analog systems or the Binary Frequency Shift Key‐in (BFSK) modulation in digital applications. The receiver has the similar CO and VCO with closed parameters. A simple circuit based on the Phase locked Loop (PLL) is used for both synchronization of the chaotic oscillators and demodulation of the carrier signal. Using the dynamical systems approach we show that the suggested device has a broad parameter region in which the synchronization and demodulation take place. In computer simulations we demonstrate that the system is robust against the noise and parameters mismatch.