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Recent wireless communication systems have been developed with various and complicated additional functions. Whereas conventional RF/Microwave systems have done the original functions of frequency up/down conversions, spectral power selection/limitation, and noise control, they are required for more agile operations such as antenna beam steering, frequency channel adjusting, performance calibrations,...
Design considerations are presented for antenna systems with complex front-end circuits. The actual characteristics of a radiating element should be considered when eliminating the effect of additional subsystem circuits. A simple de-embedding method, which uses artificial 1:j-transformers, can simply compute the resonant and radiating performances of an antenna element in a commercial software. The...
In this paper, a flexible microwave tag system using a frequency-scanning type RFID is proposed with multi-resonators based on defected ground structures. While a conventional chip-based tag stores time-sequential codes, the proposed one achieves pure passive tags by using multi-resonant bit over a wide frequency range. Moreover, the resonator of the spiral-shaped defected ground structure implemented...
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