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A very low-cost RFID reader architecture comprised of a voltage-controlled oscillator (VCO), a mixer, and a low-pass filter (LPF) for reading an ultra-wideband chipless RFID tag is proposed. The VCO generates a linear chirp (swept) frequency interrogation signal. The reader, which is a coherent frequency-modulated continuous-wave radar, interrogates a tag and decodes the tag's identification data...
The time domain response of an ultra-wideband (UWB) 2 × 2 element dipole array is presented. The antenna is an elliptically shaped dipole array with a circular back reflector. It is operating over 3.9–9.5 GHz frequency band with >9 dBi gain and 40° average 3 dB beamwidth. The forward transmission coefficient (S21) vs frequency of two identical antennas were measured at a fixed distance. The measured...
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