(A) study on wideband antennas for mmW high data-rate mobile communication

Abstract

This paper present several wide-band millimeter-wave antennas for high data-rate mobile application. In Chap. 2, a wideband aperture efficient 60-GHz series-fed E-shaped patch antenna array with co-polarized parasitic patches is proposed for high-data rate communication. A novel series-fed E-shaped patch antenna array with co-polarized parasitic patches for enhanced aperture efficiency at 60-GHz unlicensed wide band applications is proposed. The additional radiation from the inserted co-polarized parasitic patches between series-fed patches improves the gain flatness remarkably as well as the gain and aperture efficiency, because of the off-set resonant frequency. In Chap. 3, a 60-GHz wideband switched-beam dipole array fed hybrid horn antenna is proposed. Compared to a dipole array, a 6.7-dB gain improvement was achieved, and the 6.5GHz bandwidth is further improved from 7.6GHz by forming additional resonance, which is caused by the gap between the dipole array and horn structure. Furthermore, compared to the outcome of a conventional horn antenna, the radiation angle can be varied widely. In Chap. 4, 60-GHz low-profile, wideband dual polarized U-Slot coupled patch antenna with high isolation is proposed. The proposed antenna exhibits broadband characteristics that entirely cover the 60-GHz industrial, scientific, and medical (ISM) band, by forming additional resonance at the U-shaped coupled slot. The port isolation is improved by up to 38.6 dB via circulating current in the feed line of the isolation port, which is caused by a reverse placement between the current distributions of the circular patch and U-shaped slot. This phenomenon occurs at the resonant frequency point of the circular patch, and is caused by inducing currents of the U-shaped slot and the patch orthogonally to the feeding line. Chap. 5 describes a 60-GHz wideband, low-power active receiving antenna with adjustable polarization is proposed for SNR Improvement.