Abstract: A radio frequency screw antenna includes a metal radiation body and a coupling loop circuit. The metal radiation body includes a shank having a radial direction, a head connected to the shank, and a groove positioned at the head. A length direction of the groove is parallel to the radial direction. The coupling loop circuit is disposed at a first side wall of the groove.

Abstract: A radio frequency screw antenna includes a metal radiation body and a coupling loop circuit. The metal radiation body includes a shank having a radial direction, a head connected to the shank, and a groove positioned at the head. A length direction of the groove is parallel to the radial direction. The coupling loop circuit is disposed at a first side wall of the groove.

Abstract: A solar cell structure for wireless charging includes a substrate and at least one thin film solar cell disposed on a surface of the substrate, wherein the thin film solar cell has a winding coil structure. Accordingly, in the thin film solar cell, the electrode which is the winding coil structure may be used as electromagnetic induction coil or millimeter-wave radio wave receiving radiator.

Abstract: A solar cell structure for wireless charging includes a substrate and at least one thin film solar cell disposed on a surface of the substrate, wherein the thin film solar cell has a winding coil structure. Accordingly, in the thin film solar cell, the electrode which is the winding coil structure may be used as electromagnetic induction coil or millimeter-wave radio wave receiving radiator.

Abstract: A defected ground structure for coplanar waveguides comprises two ground planes and one wire positioning between two ground planes. A gap is between each ground plane and the wire, respectively. Each ground plane is symmetrical to the other, and has at least one defected structure. More, each defected structure includes at least two parallel guide channels. One of the guide channels is connected with the gap. Further, each guide channel is connected with other through a connection channel. The defected structure for coplanar waveguides itself has a resonant characteristic. More, it forms a parallel equivalent circuit with multiple capacitors and inductors. In the same impedance, the present invention can efficiently reduce the area of the defected structure. Further, it can obtain a passband-stopband characteristic, a leaky-wave characteristic, and a slow-wave characteristic.

Abstract: The purpose of the present invention is to provide a method to extract the extrinsic capacitances of FETs by a physically-meaningful capacitive transmission line model and a linear regression technique. The method of the present invention includes method includes steps of (a) applying a gate-to-source voltage to pinch-off said FETs and setting a drain-to-source voltage to be zero for forming pinched-off cold FETs, (b) measuring S-parameters of said pinched-off cold FETs, (c) representing an intrinsic depletion region of said pinched-off cold FETs by a distributed capacitive transmission line model having a distributed series capacitance Cs and a distributed parallel capacitance Cp; and (d) executing an analytical procedure according to said measured S-parameters for obtaining Y-parameters.

Abstract: A method for fabricating submicron T-shaped gates for the field-effect transistors disclosed, which can be accomplished by using a tri-layer positive photoresist with a single electron beam exposure and a single development step. Therefore, the cost can be reduced and the yield can be raised for fabricating high speed field-effect transistors.