Comprehensive survey on passive wireless sensing technology for wireless application

In this paper, it has been observed that passive wireless sensing technology system provide compact devices to become the base for new, inexpensive passive sensing technology, as well as help to design one device instead of designing for the two components separately and then joining them for further use. A largest limitation for existing wireless sensing element approaches is their dependency on batteries limited life. To overcome these constraints, batteryless, wireless passive sensing elements have significant attention because of their less cost, longer life, less hazardous and wireless measurement. Also, it has been observed that passive wireless frequency doubling reflectenna (FDR), using f0 frequency for the forward link and 2f0 frequency for the reverse, FDR-based wireless sensors effectively work than reported for other passive wireless technologies. The designed doubler is optimized for low incoming power operation. In frequency multiplying reflectenna, frequency multiplying circuit multiply fundamental frequency (f0) covert and transmit frequency (mf0) to reflectenna, which is radiated to the interrogator. An interrogator required for transmitting and receiving signal. The interrogator used to transmit f0 frequency and monitors the mf0 frequency response created by FDR.