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An electrically small, two-element, parasitic array (Yagi) antenna is proposed for an active 433.92-MHz RFID handheld reader. The antenna is composed of a square-shaped driver and director. The circular polarization is achieved by pulling the driver and pushing the director at one side. The sense of the antenna can be changed easily by pushing the driver and pulling the director at the same side....
We present a novel detection system for nuclear magnetic resonance (NMR) logging tool with direct connection of receiver to low inductance antenna. The detection system contains receiver and signal acquisition circuit with high signal-to-noise ratio (SNR). The direct balanced connection of receiver to antenna increases SNR of the NMR signal. The first stage of receiver has a balanced input built on...
A compact, printable, parasitic array antenna operating at dual resonances is investigated. The antenna is composed of a driver and two directors. All elements are printed with copper strips on both sides of a substrate (Rogers Duroid 5880). Two directors with different lengths are twisted to generate dual resonances. In both generated bands, high gain (> 8.0 dBi) and good front-to-back ratios...
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