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Radio Frequency Identification (RFID) technology has been popular for its wide variety of applications over the past decade. In one of these applications, an RFID system has been used as a handheld device for easier asset tracking. Unlike handheld RFID readers in the passive UHF (865 – 956 MHz) band, however, active 433.92 MHz RFID handheld readers(More)
A new design of an electrically small parasitic array antenna to obtain dual bands is suggested. The antenna comprises a driver and two directors, where all elements are bent in rectangular shapes to reduce the antenna size. Two resonances nearby each other are achieved by twisting vertical segments into helical shapes, starting from the ground of both(More)
The possibility of multiple bands in electrically small, parasitic (Yagi) antenna arrays was explored. With a folded driver, and twisted, two-helical directors, where the maximum height of the elements is 0.096λ, two different bands were generated. The gain patterns at both bands are similar to that of two-element, conventional Yagi antenna.
Shoulder muscle function has been documented based on muscle moment arms, lines of action and muscle contributions to contact force at the glenohumeral joint. At present, however, the contributions of individual muscles to shoulder joint motion have not been investigated, and the effects of shoulder and elbow joint position on shoulder muscle function are(More)
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(More)
Until the past decade, optical microscopy of biological specimens was strongly limited by diffraction and scattering, affecting imaging resolution and depth, respectively. Now, numerous methods are available to overcome each of these limitations, but sub-diffraction limited resolution imaging over large volumes of scattering tissue is still a challenge.(More)
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