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Due to the rapid spread of smart phones and SNS (social network services), the use of Internet applications has increased and their need for bandwidth has begun to exceed the capacity of 3G networks. This has caused a reduction in speed and service quality and has underscored the need for network companies to invest in additional bandwidth. The increase in mobile network users has caused identity...
This paper introduces an interrogation enhancer (IE) as an external system that boosts a reader continuous wave (CW) with its auxiliary CW. The boosted reader CW powers the backscatters from a passive ultrahigh frequency radio frequency identification (UHF RFID) tag to reach the reader in extended range. The system performance is verified according to the measured ranges in practical tests. The IE...
In this paper, an ASK (Amplitude Shift Keying) modulator with DGS (Defected Ground Structure) is proposed for 900-MHz RFID (Radio Frequency Identification) system. Proposed variable DGS resonator with a varactor diode will be able to adjust the resonance frequency to achieve the ASK modulation. The variable resonance characteristics can be obtained by controlling capacitance of varactor diode, placed...
In this paper, an ASK (amplitude shift keying) modulator with DGS (defected ground structure) is proposed for 900-MHz RFID (radio frequency identification) system. Proposed variable DGS resonator with a varactor diode will be able to adjust the resonance frequency to achieve the ASK modulation. The variable resonance characteristics can be obtained by controlling capacitance of varactor diode, placed...
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