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To improve the reconstructed image quality in a 3D display system using binary phase modulator, we propose two successive methods that are a modified iterative Fresnel algorithm for designing the binary phase pattern and the intensity addition for the speckle reduction. Numerical and experimental results show the effectiveness of the proposed methods by increasing the number of iteration for optimizing...
The proposed holographic Shack-Hartmann wavefront sensor can measure a wavefront aberration with large dynamic range. It is realized by introducing a holographic optical element and pattern matching technique. To confirm the flexibility of the sensor, measurements of the wavefronts with various aberrations are numerically demonstrated.
Helmet antennas have been widely developed as wearable antennas for military and disaster prevention uses. To reduce the operational frequency band and overcome the gain reduction in proximity to human head, this paper presents the inverted-F antenna on the hemispherical metal ground plane. The arrangement of the antenna element and the feeding directions are examined in detail through electromagnetic...
We have studied the folded dipole antenna with feed line and combined folded dipole antenna with feed line, as a broadband or multi-resonance antenna. In this study, we analyzed the basic characteristics of circular combined folded dipole antenna using an electromagnetic simulator. As a result, the resonant frequency was lowered from 196 MHz to 186 MHz because of the extended antenna element without...
As a fundamental study of a broadband or multi-resonance antenna, we have studied a folded dipole antenna (FDA) and a combined folded dipole antenna (CFDA-1). Now, a new model of CFDA (CFDA-2) is designed. First, we analyze the characteristics of the antennas. Next, we compare the characteristics between the antennas. It is founded that two types of CFDA have similar characteristics.
This study presents the method of maximizing the resonant bandwidth of a vertical U-shaped folded dipole antenna (VUFDA) that projects from a small ground plane, designed for WiMAX applications in two frequency bands of 2.3∼2.7 GHz and 3.4∼3.8 GHz. By applying a suitable formulation of the objective function which represents the resonant bandwidth of VUFDA in a particle swarm optimization (PSO), an...
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