An ultra-wideband receiving antenna array

An UWB impulse radio receiving antenna array based on delay and sum beamforming is presented. The array is implemented using a simple impulse radio radar transceiver. The presented radar transceiver is fabricated in 90 nm TSMC technology, and it has a high speed sampler with sampling rate of 10 GHz which recovers the received signal with sufficient resolution. Using a programmable delay element with medium and coarse settings, an electronic beam steering step of about 10-15° is feasible. A high precision calibration circuit is explored for delay adjustment with high resolution. The measurement results show that the array with antenna spacing of about one wavelength has a cross-rang resolution of 17 cm, which is about one and half of the wavelength.