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We present here our recent result on reducing the losses of a multiple-folded tunable microstrip line phase shifter based on liquid crystal (LC) for the regime of low microwave (MW) frequencies. It is shown that the insertion and return losses can be decreased through the minimization of the electromagnetic (EM) wave discontinuities in the folded microstrip line structure. Based on a modified 6-folded...
A 2.25GHz outphasing power amplifier is implemented in a 45nm LP digital CMOS process. The PA is designed in class-D mode for low output impedance and good linearity. The PA delivers 28.1dBm peak CW power with 19.7% system efficiency (includes all drivers). Average OFDM power is 21.4/20.3dBm with efficiency 8.0/6.5% when transmitting WiFi/WiMAX signals respectively.
In this paper we will present our latest research results of integrated quantum dot Schottky diodes and integrated silicon antenna for RF applications. Both, the quantum dot Schottky diodes and the antenna are integrated on Si substrates forming a simple mm-wave detection system, the rectifying antenna (RECTENNA). Within this work a specific antenna design, 1-dimensional array (single line antenna),...
This paper describes properties of monolithic W-band IMPATT oscillator, their integration into SIMMWICs and proves their basics functionality as mW power sources for simple cost effective and flexible mm-wave systems. In this oscillator system monolithic integrated IMPATT diodes are combined with coplanar waveguide resonator on unthinned silicon wafers for mm-wave operation (around 90 GHz).
Eight far-infrared laser lines have been obtained by optically pumping acetaldehyde (CH3CHO) and nine by pumping vinyl fluoride (CH2CHF) with a cw CO2 laser. The far-infrared laser structure used a metal-dielectric waveguide cavity. This is the first reported observation of four of the laser lines in acetaldehyde. In this work, we measure the frequency, optimum pressure of operation, relative intensity,...
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