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A design of proximity coupled microstrip dipole antenna with enhanced bandwidth and gain is presented in this paper. Comparative study with coaxial fed design has been done. Also dual-frequency operation using proximity coupled microstrip dipole antenna is implemented with good bandwidth at both the frequencies.
By analyzing backscatter signal from antenna, using stacked rectangular metal patches, one could determine the characteristics (poles and zeros) of the antenna. In an ideal situation, when the incident chirp contains the resonant frequencies of the patch, the scattered signal would clearly display them. The characteristic parameters could then be used as a signature of the patch, i.e., information...
Stacked multilayer patch antennas as a candidate for sub-cent chipless RFID tags is proposed. The magnitude of scatter from such a structure ideally has negligible variation over frequency, but has predictable phase (delay) variation at pre-determined resonant frequencies. Such scattering structures can be modeled as all-pass networks and are expected to be more robust than non all-pass structures...
Antenna design for chipless tags based on remote measurement of complex impedance is discussed. Such antennas need to be printable and de-embeddable from the terminating reactive network used for coding the tag information. We demonstrate that certain antennas have a low radar cross-section (RCS) under matched condition, while maintaining a fairly uniform RCS under various reactive terminations including...
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