The dielectric resonator antenna (DRA) has received increasing attention in recent years. It has a number of advantages including its small size, light weight, low cost, ease of excitation, and relative wide bandwidth as compared with the patch antenna. Also, it is a volume device that offers the de.....
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The Doherty power amplifier (DPA), a component used in wireless communication devices, has two sub-amplifiers operating at different power levels. The differing bias conditions usually lead to unbalanced current driving ability and efficiency reduction. Unlike common techniques employed to achieve i.....
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The wideband active quasi-circulator developed by CityU allows simultaneous transmission and reception of signals from an antenna to different transmit and receive path signals without using separated filters. It enables a single device to operate in multiple bands and replace the separate blocks of.....
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The invention is a hybrid photovoltaic/thermal collector that converts solar energy to electrical energy and thermal energy by using photovoltaic cells and thermal energy collector respectively. This solar collector comprises a layer of photovoltaic (PV) cells laminated to the surface of a thermal c.....
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Speed sensors are customarily used to detect the speed of power electronic driven motors, but that speed sensors could render the motor drive system unreliable. However, there are very few detection devices other than speed sensors that can generate readings when the motor drives are in a resting mo.....
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