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In this paper, a CMOS CO2 concentration to frequency converter with calibration circuits is newly proposed. A calibration technique is proposed in this work. Another innovation is that the outputs of the proposed chip are directly digitized, they could be easily sent over a wide range of transmission media, such as PSN, radio, optical, IR, ultrasonic, and etc. Before performing the proposed calibration...
An X-band conformal array antenna designed for the use of unmanned aerial vehicles with polarimetric radars/sensors is presented. The array antennas mounted on the cylinder with various curvature radii are experimentally studied. The array can be easily placed on the aircraft fuselage or payload due to its ultra-thin and ultra-lightweight characteristics. It should have potential applications in radar...
An annular-structure lateral-diffused metal-oxide semiconductor (LDMOS) RF transistor with polyharmonic distortion (PHD) model characterized by nonlinear vector network analyzer is described in this paper. The devices were fabricated using a 0.5 mum LDMOS process. The DC, small-signal, and large-signal characteristics of RF LDMOS transistors with annular-structures were also studied in this work....
This paper presents a dielectric film with metal strips fed by the image line made of a high dielectric constant material. By using a 10.8 relative dielectric constant image line, wide and symmetrical beam-steering angle is achieved with a simple structure. Antenna size is also reduced compared to the image line antenna made of a low dielectric constant material.
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