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In this paper, a self-oscillating antenna is presented. The proposed circuit consists of an amplifier with positive feedback. In the feedback path, a two-way power divider is utilized for power splitting. One output of the power divider is electromagnetically coupled to the antenna for radiation, and the other is connected to the input of the amplifier through a delay line for positive feedback. To...
A ring-resonator branch-line coupler with unequal power division is proposed in this paper. The branch-line coupler with four coupled ring resonators at ports has the equivalent coupled-resonator filter network. The coupler therefore exhibits good stopband rejection. By carefully designing the coupling coefficients between resonators, the required unequal power division ratio along with good return...
In this paper, we propose a digital watermarking method for stereoscopic video frames. A stereoscopic video frame is stored as two images and combined by software while displayed. These two stored images are with high similarity. In the circumstances, it should be taken into consideration to resist coalition attacks while developing a watermarking scheme for stereoscopic videos. As shown in experimental...
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