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This paper describes a special form of metamaterials CRLH-TL (Composite Right/Left-Handed Transmission Line) applied to the design of high-efficiency Class-F power amplifier (Class-F PA). Due to CRLH-TL's dull-band characteristic, the CRLH-TL used to the Class-F power amplifier design can not only simplify the topology of PA circuit, but improve power additional efficiency (PAE) and realized the dual-band...
This paper describes a special form of metamaterials CRLH-TL (Composite Right/Left-Handed Transmission Line) applied to the design of high-efficiency Class-F power amplifier (Class-F PA). Due to CRLH-TL's dull-band characteristic, the CRLH-TL used to the Class-F power amplifier design can not only simplify the topology of PA circuit, but improve power additional efficiency (PAE) and realized the dual-band...
A new method for performing power current measurement is proposed; this method involves the use of Hall sensors without iron cores. A new apparatus for implementing this method, called coreless Hall-effect current transformer (HCT), has been developed. The HCT consists of four Hall sensors connected to a weighted adder. Four Hall sensors are symmetrically attached to an electric conducting cable,...
Current transformers (CTs) are adopted in power systems to measure magnitudes of currents for metering and fault protection. Since power system fault currents contain large direct current offsets, they can saturate the iron cores of the current transformers. This saturation phenomenon in iron cores will cause the protective system to make false responses. Furthermore, bulky volume of CTs also imposes...
First demonstration of long-haul transmission reaching bandwidth-distance product of 1-Tb-km/s, using silicon microring resonator electro-optic modulator, sets new precedence for silicon photonic applications. 12.5-Gb/s bit-error-rate and power penalty measurements confirm 80-km of feasible fiber propagation.
This research applied the integrated circuit (IC) manufacturing technology to develop a new power current microsensor to replace CTs and save space in railway train sets. Two small pieces of IC chips are attached to a power cable to measure the current flowing in the cable. Measurement results show that the new power current micro-sensor can perform the same function of a CT without running into saturation...
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