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Many of the existing gas sensors cannot offer long-term continuous performance, rendering them selected ineffective for environmental and point-of-care monitoring tasks. The problem may arise from the limitation in accessible power supplies for their operation and signal communications. As a solution, a wireless passive gas sensor based on low temperature co-fired ceramic (LTCC) technology is presented...
A new design for a radio frequency (RF) energy harvesting circuit, which enables capturing energy from an electromagnetic far field, is presented in this paper. First, we present the state of the art of common energy harvesting systems. Second, we introduce some important preconsiderations concerning near and far field propagation and how to calculate the expected power at the input of the system...
Wireless power transfer systems of resonance coupling or inductive coupling utilize electrically very small antennas, which are either self-resonant or non-self-resonant. The system with non-self-resonant antennas requires the external circuit for impedance matching and high power transfer efficiency. This paper presents the design formulas for four kinds of external circuits, and discusses their...
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